ML4435 Sensorless BLDC Motor Controller

The ML4435 provides all the circuitry for sensorless
speed control of 3 phase Brushless DC Motors. Controller
functions include start-up circuitry, Back EMF commuta-
tion control, Pulse Width Modulation (PWM) speed con-
trol, pulse-by-pulse current limiting, motor coasting, and
under-voltage protection.

Motor starting is accomplished by commutating the motor
at a low frequency to produce low speed motion. The
low speed motion is used to generate a Back EMF signal.
A back EMF sampling circuit locks on to the motors posi-
tion and controls commutation timing by forming a phase
locked loop (PLL). The commutation control circuitry also
outputs a speed feedback signal used in the speed control
loop. The speed control loop consists of an error amplifi er
and PWM comparator that produces a PWM duty cycle
for speed regulation. Motor current is limited by a pulse-
by-pulse PWM shutdown comparator that is tripped by
the voltage across an external current sense resistor. Com-
mutation control, PWM speed control, and current limit-
ing are combined to produce the output driver signals.
Six output drivers are used to provide gating signals to an
external 3 phase bridge power stage sized for the Brush-
less DC (BLDC) motor voltage and current requirements.
Additional functions include a motor coast function and
an under voltage lock out circuit to shut down the output
drivers in the event of a low voltage condition on the VCC
to the ML4435.

May, 2000

PRELIMINARY DATASHEET

GENERAL DESCRIPTION

FEATURES

n Proprietary back-EMF sensing commutation technique

for motor communication without hall effect sensors

n PWM pulse-by-pulse current limiting to protect motor

and FET drivers

n Stand-alone operation; motor starts and stops with

power applied to the IC*

n Soft-start function limits start-up current

n PWM speed control for effi ciency and minimum FET

sizing

n Onboard under voltage lock out and power fail detect

n Tach output senses commutation of the motor

PRELIMINARY

* Some External Components Required.

PRELIMINARY DATASHEET

May, 2000

PRELIMINARY

ML4435

Micro Linear makes no representations or warranties with respect to the accuracy, utility, or completeness of the contents of
this publication and reserves the right to make changes to specifi cations and product descriptions at any time without notice.
No license, express or implied, by estoppel or otherwise, to any patents or other intellectual property rights is granted by this
document. The circuits contained in this document are offered as possible applications only. Particular uses or applications
may invalidate some of the specifi cations and/or product descriptions contained herein. The customer is urged to perform
its own engineering review before deciding on a particular application. Micro Linear assumes no liability whatsoever,
and disclaims any express or implied warranty, relating to sale and/or use of Micro Linear products including liability
or warranties relating to merchantability, fi tness for a particular purpose, or infringement of any intellectual property
right. Micro Linear products are not designed for use in medical, life saving, or life sustaining applications.

is a registered trademark of Micro Linear Corporation. All other trademarks are

the property of their respective owners.

Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116;
5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376;
5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167; 5,714,897; 5,717,798; 5,742,151; 5,747,977; 5,754,012;
5,757,174; 5,767,653; 5,777,514; 5,793,168; 5,798,635; 5,804,950; 5,808,455; 5,811,999; 5,818,207; 5,818,669; 5,825,165;

5,825,223; 5,838,723; 5.844,378; 5,844,941. Japan: 2,598,946; 2,619,299; 2,704,176; 2,821,714. Other patents are pending.

WARRANTY

May, 2000

PRELIMINARY DATASHEET

PRELIMINARY

ML4435

SOFT START

VCC

GND

ISENSE 1

SPEED COMP

SPEED SET 5

COAST

TACH

CVCO

RVCO

SPEED FB

FB C 16

FB B

FB A

8.7V

VREF

0.97V

1.5V

VREF + 0.7V

2.2 + 0.7V

0.9V

8.2 + 0.7V

225k

5.8k

2.9k

CURRENT LIMIT

COMPARATOR

PULSE-BY-PULSE
CURRENT LIMIT

PWM
COMPARATOR

UVLO COMPARATOR

SPEED
ERROR AMP

SPEED FB

BACK

EMF SAMPLER

3µs

POWER ON

RESET PULSE

6V REFERENCE

COMMUTATION

STATE MACHINE

GATING

LOGIC

AND

OUTPUT

DRIVERS

VOLTAGE

CONTROLLED

OSCILLATOR

LEVEL
SHIFT
0.7V

LEVEL SHIFT

0.7V

COMP

SIGN

CHANGER

NEUTRAL

SIMULATOR

TRIANGLE WAVE

GENERATOR

MUX

BLOCK DIAGRAM

ML4435 Block Diagram

PRELIMINARY DATASHEET

May, 2000

PRELIMINARY

ISENSE

TACH

SPEED COMP

RVCO

SPEED SET

VCC

CVCO

SOFT START

SPEED FB

FB C

FB B

FB A

TOP VIEW

ML4435

20-P n PDIP P20
20-P n SOIC S20

ML4435

PIN NAME

FUNCTION

1 ISENSE

Motor current sense input which triggers pulse by pulse current limit when

ISENSE exceeds 0.55V

2 TACH

A clock output of 6 pulses per commutation cycle when SPEED FB is greater

than 0.97V otherwise the TACH output is at 5V

3 SPEED COMP

Connection node for speed loop compensation components

4 RVCO

Connection node for external resistor to set VCO frequency

5 SPEED SET

DC input for setting motor speed

6 RT

External resistor from this pin to ground controls the IC's PWM timing (frequency)

HA High-side output driver for motor phase A

HB High-side output driver for motor phase B

HC High-side output driver for motor phase C

10 VCC

Power Supply input

11 LA

Low-side output driver signal for motor phase A

12 LB

Low-side output driver signal for motor phase B

13 LB

Low-side output driver signal for motor phase C

14 FB A

Back EMF signal input for motor phase A

15 FB B

Back EMF signal input for motor phase B

16 FB C

Back EMF signal input for motor phase C

17 GND

Signal and power ground

18 SPEED FB

Connection node for back-EMF sensing compensation components

19 SOFT START

Connection node for external soft start capacitor which reduces start up current

20 CVCO

Connection node for external capacitor to set VCO frequency. Forcing this input

below 1.5V causes the commutation to stop and the motor to coast

PIN DESCRIPTIONS

PIN CONFIGURATION

May, 2000

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PRELIMINARY

ML4435

COMPONENT SELECTION

Selecting external components for the ML4435 requires
calculations based on the motor's electrical and mechani-
cal parameters. The following is a list of the motor param-
eters needed to for these calculations:

The maximum DC motor supply voltage V MOTOR (V)

The maximum operating current I MAX (A)

The winding resistance measured line to line Rl-l

The number of magnetic poles N (Unitless)

The Back EMF constant Ke (V s/RAD)

The torque constant K

(N m/A) of the motor (K

= Ke

in SI units)

The maximum speed of operation RPMMAX (RPM)

The moment of inertia J (Kg m

) of the motor and its

load

The viscous damping factor

(Unitless) of the motor and

its load

If one or more of the above values is not known, it is
still possible to pick components for the ML4435, but
some experimentation may be necessary to determine the
optimal values. All quantities are in SI units unless other-
wise specifi ed. The following formulas and component
selection graphs should be considered as a starting point
from which to optimize the application. All calculations
for capacitors and resistors should be used as the fi rst
approximation for selecting the closest standard value.

SUPPLY VOLTAGE AND ON-CHIP VOLTAGE
REFERENCE

VCC

The supply voltage at VCC (pin 10) is nominally
12V ± 10%. A bypass capacitor of 0.1µF to ground as
close as possible to VCC (pin 10) is recommended.

An internal 6V reference is generated inside the ML4435.
The reference appears on RT (pin 6). A resistor to ground
on RT sets the PWM frequency. This resistor can be
replace with a potentiomenter for use in setting the speed
command. This topic is discussed under the PWM SPEED
CONTROL section. Note: Buffer this pin with an op amp
with at least a 1M

input impedance if external circuits

are necessary.

OUTPUT DRIVERS

The output drivers LA, LB, LC,

HA, HB, and HC provide

totem pole output drive signals for a 3 phase bridge power
stage. All control functions in the ML4435 translate to
outputs at these pins. LA, LB, LC provide the low side drive
signals for phases A, B, and C of the 3 phase power stage
and are 12V active high signals.

HA, HB, and HC provide

the high side signals for phases A, B, and C of the 3 phase
power stage and are 12V active low signals.

CURRENT LIMITING IN THE 3 PHASE BRIDGE
POWER STAGE

A current sense resistor RSENSE shown in Figure 1 is
installed in the 3 phase power stage to regulate the maxi-
mum current in the power stage and the BLDC motor.
Current regulation is accomplished by shutting off the
output drivers LA, LB, and LC for the remainder of the
PWM period if the voltage across RSENSE exceeds the
current limit threshold set by the SOFT START (pin 19).
The maximum power dissipated in RSENSE is shown in
Figure 2.

Figure 1. Current Limit with RSENSE

Figure 2. RSENSE Power vs. Motor Current

RSENSE

ISENSE

RSENSE P

er Rat

IMAX [MOTOR] A

FUNCTIONAL DESCRIPTION

PRELIMINARY DATASHEET

May, 2000

PRELIMINARY

ML4435

SOFT START

The voltage at SOFT START (pin 19) sets the current limit
threshold. The ML4435 has an internal voltage divider
with a 1.1V supply voltage. This circuit is shown in Figure
3. The divider consists of two 225k

resistors setting

the current limit threshold to approximately 0.55V. An
external voltage divider off of VCC or an external reference
can be used to override the default setting of SOFT START
by using a divider with 10 times the current draw of the
internal divider.

RSENSE

The function of RSENSE is to provide a voltage propor-
tional to the motor current, for current limiting. The default
trip voltage across RSENSE is 0.6V as set by the SOFT
START (pin 19). The current sense resistor should be a
low inductance resistor such as a carbon composition. For
resistors in the milli ohms range wire wound resistors tend
to have low values of inductance. RSENSE can be selected
using Figure 4. The power rating of RSENSE should be
sized to handle the power dissipation (I MAX squared
times RSENSE) seen at maximum current.

ISENSE FILTER

An RC lowpass fi lter is required at the ISENSE input pin
to remove the voltage spike on the leading edge of the
current sense signal caused by the diode reverse recovery
shoot through current. Absent the fi lter, false triggering of
the current limit could occur.

The recommended starting values for this circuit are
R = 1K

and C = 1000pF a confi guration that will fi lter

out spikes less than 1

s long. It is recommended that the

capacitor value not be increased beyond 330pF.

Pulse-By-Pulse Current Limiting

When current limit is activated by the voltage on ISENSE
exceeding the voltage on SOFT START the current limit is
tripped, turning off LA, LB, and LC for the remainder of
the PWM period.

COMMUTATION CONTROL

A 3 phase Brushless DC motor requires electronic com-

Figure 3. SOFT START Function

0.5V

. V

CSOFT START

SOFT START

225k

A capacitor to ground on the SOFT START pin can be used
to provide a soft ramping of the current limit on power up.
The ramp time can be selected using Figure 4.

Figure 4. SOFT START Ramp Time vs. CSOFTSTART

RAMP TIME

C SOFT START F

Figure 5. ISENSE Filter Wave Forms

BEFORE FILTERIN

AFTER FILTERIN

FUNCTIONAL DESCRIPTION

May, 2000

PRELIMINARY DATASHEET

PRELIMINARY

ML4435

mutation to achieve rotational motion. Electronic com-
mutation requires the switching on and off of the power
switches of a 3 phase half bridge. For torque production
to be achieved in one direction the commutation is dic-
tated by the rotor's position. Electronic commutation in
the ML4435 is achieved by turning on and off, in the
proper sequence, one L output from one phase and one

output from another phase. There are six combinations of
L and

H outputs (six switching states) that constitute a full

commutation cycle as illustrated in Table 1 labeled state
A through F. This switching sequence is programmed into
the commutation state machine as illustrated in Figure 6.
Clocking of the commutation state machine is provided by
the output of a VCO.

VOLTAGE CONTROLLED OSCILLATOR

The VCO outputs a TTL compatible clock on the TACH

(pin 2) proportional to the input voltage to the voltage
controlled oscillator SPEED FB (pin 18). The proportion of
frequency to voltage or VCO constant Kv is set by a resistor
to ground on RVCO (pin 4) and capacitor to ground on
CVCO (pin 20) as shown in Figure 7. RVCO sets up a
current proportional to the VCO input voltage SPEED FB
minus 0.7V. This current is used to charge and discharge
CVCO between the threshold voltages of 2V and 3.75V as
shown in Figure 7. RVCO has a lower voltage limit of 0.2V.
The resulting triangle wave of CVCO corresponds to the
clock on the TACH pin, this is also illustrated in Figure 7. Kv
should be set so that the VCO output frequency corresponds
to the maximum commutation frequency FMAX and thus the
maximum motor speed when the VCO input is equal to or
slightly less than 6V. CVCO and RVCO can be selected by
fi rst calculating FMAX and then using the selection graph in
Figure 8. FMAX is calculated as follows:

FMAX = 0.05 x RPMMAX x N

Where: RPMMAX = The maximum speed of operation
(RPM). N = The number of magnetic poles (Unitless).

TACH

The TACH (pin 2) outputs the VCO frequency. This is 6

Figure 6. Commutation State Machine

3 s

POWER ON

RESET PULSE

CLK VCO

COMMUTATION

STATE MACHINE

Figure 7. VCO Control

RVCO

SPEED FB

0.9V

VOLTA E

CONTROLLED

OSCILLATOR

LEVEL
SHIFT

0. V

CVCO

3. 5V

Table 1. Communication Control States

S
TAT

OUTPUT DRIVERS

LOW LOW HI H LOW HI H HI H

LOW LOW HI H HI H LOW HI H

HI H LOW LOW HI H LOW HI H

HI H LOW LOW HI H HI H LOW

LOW HI H LOW HI H HI H LOW

LOW

= DRIVER ON

HI H LOW LOW HI H HI H

FUNCTIONAL DESCRIPTION

PRELIMINARY DATASHEET

May, 2000

PRELIMINARY

ML4435

times the commutation frequency. The TACH out also
indicates a low motor speed by staying TTL high when the
motor is at its minimum speed (SPEED FB below 0.97V).

BACK EMF SAMPLER

The input to the VCO (pin 18) SPEED FB is controlled by
the Back EMF Sampler. The back EMF sense pins FB A,
FB B, and FB C inputs to the back EMF sampler require
a signal from the motor phase leads that is below the
VCC of the ML4435. The phase sense input impedance is
8.7k

. If the motor voltage is greater than the VCC of the

ML4435 then this requires a series resistor RFB from the
motor phase lead shown in Figure 8. RFB can be selected
by using the graph in Figure 9 or using the following
equation:

VNEUTRAL = (FB A + FB B + FB C)/3

This allows the ML4435 to compare the back EMF signal
to the motors neutral point without the need for bringing
out an extra wire on a WYE wound motor. For DELTA
wound motors there isn't a physical neutral to bring out so
this reference point must be calculated anyway.

The back EMF sampler takes the motor phase that is not
driven (i.e. if LA and

HB are on then phase A is driven

low and phase B is driven high then phase C is sampled).
The sampled phase provides a back EMF signal that is
compared against the neutral of the motor. The sampler
is controlled by the commutation state machine. The
sampled back EMF is compared to the neutral through an
error amplifi er. The output of the error amplifi er outputs
a charging or discharging current to SPEED FB (pin 18)
which provides the voltage to the VCO.

BACK EMF SENSING PHASE LOCKED LOOP
COMMUTATION CONTROL

The three blocks: The commutation state machine, the
VCO, and the back EMF sampler form a phase locked
loop that locks the commutation clock onto the back EMF
signal. The complete phase locked loop is illustrated in
Figure 10. The phased locked loop requires a lead lag
fi lter that is set by external components on SPEED FB (pin
18). The fi lter components in Figure 10 work for most
applications. If performance is unstable C1 and C2 can
go up or down a decade in value as low as the C2 stays
equal to C1 x 10.

Figure 10. Phase Locked Loop

FBA

VCO

BACK EMF

SAMPLER

COMMUTATION

STATE MACHINE

SPEED FB

RSFB

CSFB2

CSFB

FBB

FBC

RSFB2

Figure 9. RFB vs. VMOTOR [MAX]

FUNCTIONAL DESCRIPTION

RFB = 8.7k

(

VMOTOR

- 1)

The back EMF sampler takes the motor phase voltages
divided down to signals that are less than VCC (12V
nominal) and calculates the neutral point of the motor by
the following equation:

R B F

A, B, C

Motor Volta e [Max] V

2,000

4,000

6,000

,000

0,000

2,000

Figure 8. Back EMF Sampler Confi guration

BLDC

MOTOR

RFBA

RFBB

RFBC

FBA

FBB

FBC

May, 2000

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PRELIMINARY

ML4435

FUNCTIONAL DESCRIPTION

MOTOR START-UP

When power is fi rst applied to the ML4435, the motor is at
rest and thus, the back EMF is equal to zero. The motor
needs to be rotating for the Back EMF sampler to lock onto
the rotor position and commutate the motor. The ML4435
uses a minimum VCO frequency to begin commutating the
motor. This low frequency commutation is set by the 0.2V
clamp on RVCO, this provides a commutation frequency
at 1/30th of the maximum frequency.

RUN MODE

After the Back EMF sensing PLL has locked on to the
motor's position, the motor is running in closed loop con-
trol. At this point, the speed control loop should force the
motor speed to the speed that corresponds to the SPEED
SET voltage.

PWM SPEED CONTROL

Speed control is accomplished by setting a speed com-
mand at SPEED SET (pin 5) with an input voltage from 0.2
to 6V. The accuracy of the speed command is determined
by the external components RVCO and CVCO. There are
a number of methods to control the speed command on
the ML4435. One method is to use a potentiometer from
RT to ground with the wiper going to SPEED SET. If SPEED
SET is controlled from a microcontroller, a DAC that uses
RT as its input reference can be used. The RT voltage must
be buffered connecting it to external circuits. The speed
command is compared with the sensed speed from SPEED
FB minus 0.7V (pin 18) through a transconductance error
amplifi er. The output of the speed error amplifi er is SPEED
COMP (pin 3). SPEED COMP is clamped between 8.2V
and 2.2V. A signal of 8.2V corresponds to full PWM duty
cycle and 2.2V corresponds to 0% duty cycle. Speed
loop compensation components are placed on this pin as
shown in Figure 11.

The speed loop compensation components are calculated
as follows:

NxKexVMOTOR R

J RI freq

VCO

144

× × × ×

Rsc

freq Csc

× ×

Csc1 = 10 x Csc2

Where freq is the speed loop bandwidth in Hz.

Figure 11. PWM Oscillator Circuit

The voltage on SPEED COMP (pin 3) is compared with a
triangle wave oscillator to create a PWM duty cycle. The
PWM oscillator creates a triangle wave function from 3V
to 7V as shown in Figure 11. The frequency of the triangle
wave oscillator is set by a resistor to ground on RT (pin 6).
RT can be selected from the graph in Figure 12.

The PWM duty cycle from the speed control loop is gated
the pulse-by-pulse current limit that controls the LA, LB,
and LC output drivers.

Figure 12. RT vs PWM Frequency

SPEED
COMP

SPEED
SET

SPEED FB

PWM
COMPARATOR

TRIAN LE

WAVE

COMPARATOR

SPEED
ERROR AMP

LEVEL SHIFT

0. V

2.2 + 0. V

CSE

.2 - 0. V

PWM FRE UENCY kHz

000

PRELIMINARY DATASHEET

May, 2000

PRELIMINARY

ML4435

COAST

When CVCO (pin 20) is pulled below 1.5V the output
drivers LA, LB, LC and

HA, HB, and HC are turned off.

The COAST function shuts all power off from the motor
allowing it to coast to a stop. The COAST function in (pin
20) is confi gured as shown in Figure 13 and can be driven
by a switch to ground or open collector to ground also
shown in Figure 13.

Figure 14a. ML4435 Typical Application

UNDER VOLTAGE PROTECTION

Undervoltage protection is used to protect the 3 phase
bridge power stage from a low VCC condition. Undervolt-
age is triggered at VCC of 9.2V or under. Undervoltage
also turns off all output drivers LA, LB, LC,

HA, HB, and

HC. The comparator that triggers undervoltage protection

has 500mV of hystersis.

INTERFACING THE OUTPUT DRIVERS TO THE 3
PHASE BRIDGE POWER STAGE

The most fl exible confi guration is to use high side drivers
to control N-Channel MOSFETs (or IGBTs) allowing appli-
cations from less than 12V up to 170V. Figure 14a shows
the ML4435 and all the support circuitry in a typical
application. Figure 14b shows a power stage using the
IR2118 high side drivers from International Rectifi er and
high voltage MOSFETs.

FUNCTIONAL DESCRIPTION

0.33 F

0 F

.033 F

TP 2

S FB

200k

C 0

TP 5 LIMIT

RUN

N.C.

SW4PDT

COAST

N.C.

IDC 26

N.C.

00 F

R 0 k

R 2 k

R9 k

R k

90.9k

SPEED SET

TP 3 TACH

TP 0 ISENSE

R2 00k

R6 0k

R4 20k

2200 F

R3 k

ML4435

ISENSE

TACH

S COMP

RVCO

S SET

VCC

CVCO

I LIMIT

S FB

FB C

FB B

FB A

.5V

3. 5V

COMP

CVCO

COAST

Figure 13. Coast Control

May, 2000

PRELIMINARY DATASHEET

PRELIMINARY

ML4435

Figure 14b. Power Stage

FUNCTIONAL DESCRIPTION

ISENSE

R50 0

R35

R30

UF4005

IR2

UNUSED

R36

D2 UF4005

IR2

R42

IRF644

D3 UF4005

2N440

2N4403

IR2

2N440

2N4403

2N440

2N4403

IRF644

R43

.0k

R44

.5k

PHASE C

TERMINAL

IRF644

.0k

.5k

PHASE B

TERMINAL

IRF644

.0k

R32

.5k

PHASE A TERMINAL

0.33

250V

0.33

250V

390

200V

R49

0.4

2PIN

IDC 26

ISENSE

SA FUSE

PRELIMINARY DATASHEET

May, 2000

PRELIMINARY

ML4435

Unless otherwise specifi ed, Ta= Operating Temperature Range, VCC= 12V +/- 10%, RT= 50k
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

REFERENCE

RT 5.8 6 6.2 V

VCO

RVCO Lower Range

0.2 V

Upper Range

CVCO Lower Threshold

2 V

Upper Threshold

3.75 V

Coast Enable Threshold

1.5 V

Back EMF Blanking Threshold

2.875 V

SPEED FEEDBACK

Output Range

0 6.7 V

V Minimum Frequency

V Speed Feedback 0.9 V

TACH Out Disabled Threshold

TACH Out = Hi 0.97 V

I Back EMF Sampler

V Speed Feedback = 3.3V +/-80 µA

BACK EMF SENSING

Feed Back Input Range

FB A, FB B, and FB C 0 VCC V

TACH

TACH Out Low ISINK = 100µA 0.2 0.4 V

TACH Out High ISOURCE =100µA 4.3 4.8 V

SPEED ERROR AMP

SPEED SET Range

0 6 V

I SPEED COMP V SPEED COMP = 5.1V +/-45 µA

SPEED COMP Output Lower Clamp

I = ±45µA 2.15 V

SPEED COMP Output Upper Clamp

I = ±45µA 8.2 V

OSCILLATOR

PWM Frequency N1, N2, N3 17 25 33 kHz

Duty Cycle

N1, N2, N3 0 100 %

CURRENT SENSE

V SOFT START 0.48 0.58 0.68 V

ISENSE Threshold

0.58 V

OUTPUTS (N1, N2, N3, P1, P2, AND P3)

Output Low ISINK = 20mA 0 0.5 1 V

Output High (VCC-VOUT) ISOURCE = 20mA 0 0.5 1 V

UNDER-VOLTAGE LOCKOUT

Start Threshold 8.7 9.2 9.7 V

Under Voltage Threshold 8.2 8.7 9.2 V

SUPPLY

ICC Supply Current 15 mA

Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions

Note 2 Guaranteed by design, not tested

ELECTRICAL TABLES

May, 2000

PRELIMINARY DATASHEET

PRELIMINARY

ML4435

PHYSICAL DIMENSIONS

(inches/millimeters)

SEATIN PLANE

0.240 - 0.260

6.09 - 6.6

PIN

0.295 - 0.325

.49 - .26

.0 0 - .035

25.65 - 26.29

0.0 6 - 0.022

0.40 - 0.56

0. 00 BSC

2.54 BSC

0.00 - 0.0 2

0.20 - 0.3

0.0 5 MIN

0.3 MIN

0º - 5º

0.055 - 0.065

.40 - .65

0. 0 MAX

4.32 MAX

0. 25 MIN

3. MIN

0.060 MIN

.52 MIN

4 PLACES

Packa e P20

20-P n PDIP

SEATIN PLANE

0.29 - 0.30

.39 - .65

PIN

0.39 - 0.4 2

0. - 0.4

0.49 - 0.5 2

2.65 - 3.00

0.0 2 - 0.020

0.30 - 0.5

0.050 BSC

.2 BSC

0.022 - 0.042

0.56 - .0

0.095 - 0. 0

2.4 - 2. 2

0.005 - 0.0 3

0. 3 - 0.33

0.090 - 0.094

2.2 - 2.39

0.00 - 0.0 5

0. - 0.3

0º - º

0.024 - 0.034

0.6 - 0. 6

4 PLACES

Packa e S20

20-P n SOIC

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