Z
TO92
(Plastic Package
.
LOW TEMPERATURE COEFFICIENT
.
WIDE OPERATING CURRENT OF 400
A TO
10mA
.
0.2
DYNAMIC IMPEDANCE
.
GUARANTEED TEMPERATURE STABILITY
.
FAST TURN-ON
DESCRIPTION
The LM236 and LM336 are precision 2.5V regulator
diodes. These voltage reference monolithic ICs op-
erate like 2.5V zener diodes with a low temperature
coefficient and a dynamic impedance of 0.2
. A
third pin enables adjusting the reference voltage
and the temperature coefficient.
PIN CONNECTIONS
8
7
6
5
1
2
3
4
V
NC
-
ADJ
NC
NC
V+
NC
NC
SO8
(Top view)
V+
ADJ
V-
TO92
(Bottom view)
D
SO8
(Plastic Micropackage)
2.5V VOLTAGE REFERENCES
LM236
LM336,B
ORDER CODES
Part num-
ber
Temperature Range
Package
Z
D
LM236
25
o
C, +85
o
C
LM336,B
0
o
C, +70
o
C
October 1997
1/9
3pF
10k
50k
24k
24k
6.6k
V
600
30k
ADJ
6.6k
1.1k
2k
V
6pF
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
LM236
LM336,B
Unit
I
R
I
F
Current
Reverse
Forward
15
10
15
10
mA
T
oper
Operating Free-air Temperature Range
25 to +85
0 to +70
o
C
T
stg
Storage Temperature Range
65
to
+150
o
C
ELECTRICAL CHARACTERISTICS
LM236
-25
o
C
T
amb
+85
o
C
LM336,B
0
o
C
T
amb
+70
o
C
(unless otherwise specified)
Symbol
Parameter
LM236
LM336,B
Unit
Min.
Typ.
Max.
Min.
Typ.
Max.
V
R
Reverse Breakdown Voltage
(T
amb
= +25
o
C, I
R
= 1mA)
LM236, LM336
LM336B
2.44
2.49
2.54
2.39
2.44
2.49
2.49
2.59
2.54
V
V
R
Reverse Breakdown Voltage Change with Current
(400
A
I
R
10mA)
T
amb
= +25
o
C
T
min.
T
amb
T
max.
2.6
3
6
10
2.6
3
10
12
mV
Z
D
Reverse Dynamic Impedance (I
R
= 1mA)
T
amb
= +25
o
C
T
min.
T
amb
T
max.
0.2
0.4
0.6
1
0.2
0.4
1
1.4
K
VT
Temperature Stability (V
R
= 2.49V, I
R
= 1mA)
3.5
9
1.8
6
mV
K
VH
Long Term Stability (T
amb
= +25
o
C
0.1
o
C, I
R
= 1mA)
20
20
ppm
LM236 - LM336,B
2/9
LM236 - LM336,B
3/9
APPLICATION HINTS
The LM236, LM336 voltage references are easier to
use than zener diodes. Their low impedance and
wide current range facilitate biasing in any circuits.
Besides, the breakdown voltage or the temperature
coefficient can be adjusted so as to optimize the per-
formance of the circuit.
Figure 1 represents a LM336 with a 10k
potenti-
ometer to adjust the reverse breakdown voltage can
be adjusted without altering the temperature coeffi-
cient of the circuit. The adjustment range is gener-
ally sufficient to adjust the initial tolerance of the cir-
cuit and the inaccuracy of the amplifier circuit.
To obtain a lower temperature coefficient two diodes
can be connected in series as indicated in Figure 2.
When the circuit is adjusted to 2.49V the tempera-
ture coefficient is minimized.
For a correct temperature coefficient, the diodes
should be at the same ambient temperature as the
LM336. The value of R1 is not critical (2-20k
).
R1
10k
LM336
V
R
S
Figure 1 : The LM336 with Pot for Adjustment of
Breakdown Voltage
R1
10k
LM336
V
R
S
1N4148
1N4148
Figure 2 : Temperature Coefficient Adjustment
LM236 - LM336,B
4/9
LM336
+5V
2.5k
+2.5V
TYPICAL APPLICATIONS
Figure 3 : 2.5V Reference
V
i
+3.5V to +40V
LM334
68
LM336
V = +2.5V
O
Figure 4 : Wide Input Range Reference
V
i
1.2k
W
ADJ
LM317
Input
Output
V
O
1N457
R1
375
W
LM336
10k
W
1N457
R2
2k
W
Output adjust
Figure 5 : Precision Power Regulator with Low Temperature Coefficient
+6V to +40V
R
S
20k
100k
560
V
O
+5V to +40V
2N2905
100pF
20k
LM308A
LM336
Figure 6 : Adjustable Shunt Regulator
LM236 - LM336,B
5/9
100pF
LM308A
2.5k
25
k
1%
250
k
1%
2.5
M
1%
1%
LM334
35
10k
calibrate
V
V
O
R
x
2
1
8 6
3
LM336
1M
/V
100k
/V
1k
/V
10k
/V
Figure 7 : Linear Ohmmeter
+5V
5k
2k
+2V
LM336
10k
1%
10k
1%
1.25V
5k
-5V
Figure 8 : Bipolar Output Reference
LM236 - LM336,B
6/9
LM308
5 V
2
3
i
V
+7V to +36V
5.1k
20k
1%
7
6
8
100pF
4
20k
1%
LM336
10k
CAL
Figure 9 : 5V Buffered Reference
LM308A
2
3
7
6
100pF
4
20k
LM336
10k
CAL
10
F
10
F
200k
2k
2.2k
+5V
Figure 10 : Low Noise Buffered Reference
LM236 - LM336,B
7/9
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
A
1.75
0.069
a1
0.1
0.25
0.004
0.010
a2
1.65
0.065
a3
0.65
0.85
0.026
0.033
b
0.35
0.48
0.014
0.019
b1
0.19
0.25
0.007
0.010
C
0.25
0.5
0.010
0.020
c1
45
o
(typ.)
D
4.8
5.0
0.189
0.197
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
3.81
0.150
F
3.8
4.0
0.150
0.157
L
0.4
1.27
0.016
0.050
M
0.6
0.024
S
8
o
(max.)
LM236 - LM336,B
8/9
PACKAGE MECHANICAL DATA
3 PINS - PLASTIC PACKAGE TO92
Dimensions
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
L
1.27
0.05
B
3.2
3.7
4.2
0.126
0.1457
0.1654
O1
4.45
5.00
5.2
0.1752
0.1969
0.2047
C
4.58
5.03
5.33
0.1803
0.198
0.2098
K
12.7
0.5
O2
0.407
0.5
0.508
0.016
0.0197
0.02
a
0.35
0.0138
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsi-
bility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON
Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes
and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical
components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
1997 SGS-THOMSON Microelectronics Printed in Italy All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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LM236 - LM336,B
9/9
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