SCHOTTKY RECTIFIER
2 Amp
21DQ04
Bulletin PD-20707 rev. C 03/03
1
www.irf.com
Major Ratings and Characteristics
I
F(AV)
Rectangular
2
A
waveform
V
RRM
40
V
V
F
@
2 Apk, T
J
= 125C
0.5
V
T
J
range
- 40 to 150
C
Characteristics
21DQ04
Units
The 21DQ04 axial leaded Schottky rectifier has been opti-
mized for very low forward voltage drop, with moderate
leakage. Typical applications are in switching power sup-
plies, converters, free-wheeling diodes, and reverse battery
protection.
Low profile, axial leaded outline
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Very low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
Description/Features
Dimensions in millimeters and inches
Conform to JEDEC Outline DO-204AL (DO-41)
CASE STYLE AND DIMENSIONS
DO-41
21DQ04
Bulletin PD-20707 rev. C 03/03
2
www.irf.com
Part number
21DQ04
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
Voltage Ratings
40
V
FM
Max. Forward Voltage Drop
0.49
0.55
V
@ 2A
(1)
0.60
0.65
V
@ 4A
0.42
0.5
V
@ 2A
0.56
0.62
V
@ 4A
I
RM
Max. Reverse Leakage Current
0.01
0.50
mA
T
J
= 25 C
(1)
5.2
10
mA
T
J
= 125 C
C
T
Typical Junction Capacitance
130
pF
V
R
= 5V
DC
(test signal range 100Khz to 1Mhz) 25C
L
S
Typical Series Inductance
8.0
nH
Measured lead to lead 5mm from package body
T
J
= 25 C
T
J
= 125 C
V
R
= rated V
R
Typ.
Max.
Electrical Specifications
(1) Pulse Width < 300s, Duty Cycle <2%
21DQ04
Parameters
Units
Conditions
I
F(AV)
Max. Average Forward Current
2
A
50% duty cycle @ T
C
= 112C, rectangular wave form
* See Fig. 4
I
FSM
Max. Peak One Cycle Non-Repetitive
420
5s Sine or 3s Rect. pulse
Surge Current * See Fig. 6
70
10ms Sine or 6ms Rect. pulse
E
AS
Non-Repetitive Avalanche Energy
5.0
mJ
T
J
= 25 C, I
AS
= 1.0 Amps, L = 10 mH
I
AR
Repetitive Avalanche Current
1.0
A
Current decaying linearly to zero in 1 sec
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
Absolute Maximum Ratings
Following any rated
load condition and with
rated V
RRM
applied
A
Parameters
21DQ04
Units
Conditions
T
J
Max. Junction Temperature Range (*)
-40 to 150
C
T
stg
Max. Storage Temperature Range
-40 to 150
C
R
thJA
Max. Thermal Resistance Junction
100
C/W DC operation
to Ambient
Without cooling fin
R
thJL
Typical Thermal Resistance Junction
25
C/W DC Operation (* See Fig. 4)
to Lead
wt
Approximate Weight
0.33(0.012) g (oz.)
Case Style
DO-204AL(DO-41)
Thermal-Mechanical Specifications
Parameters
21DQ04 Units
Conditions
<
thermal runaway condition for a diode on its own heatsink
(*) dPtot
1
dTj
Rth( j-a)
21DQ04
Bulletin PD-20707 rev. C 03/03
3
www.irf.com
Fig. 2 - Typical Values of Reverse Current
Vs. Reverse Voltage
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage
Fig. 1 - Maximum Forward Voltage Drop Characteristics
1 0
10 0
1 0 00
0
1 0
2 0
3 0
40
R
T
J
u
n
c
t
i
o
n
C
a
pa
c
i
t
a
n
c
e
-
C
(
pF
)
Reverse Voltag e - V
(V)
T = 25C
J
0 .1
1
10
0
0.3
0 .6
0 .9
1 .2
F
FM
T = 150C
T = 125C
T = 25C
J
J
J
Forw ard Voltage D rop - V
(V)
In
st
a
n
t
a
n
e
o
u
s
F
o
r
w
a
r
d
C
u
r
r
e
n
t
-
I
(
A
)
0 .00 0 1
0.0 01
0 .01
0.1
1
1 0
10 0
0
10
20
3 0
4 0
R
R
125C
100C
75C
50C
25C
R
e
v
e
rs
e
C
u
r
re
n
t
-
I
(
m
A
)
Reverse V oltage - V
(V)
T = 15 0C
J
21DQ04
Bulletin PD-20707 rev. C 03/03
4
www.irf.com
Fig. 4 - Maximum Allowable Lead Temperature
Vs. Average Forward Current
Fig. 5 - Forward Power Loss Characteristics
Fig. 6 - Maximum Non-Repetitive Surge Current
(2) Formula used: T
L
= T
J
- (Pd + Pd
REV
) x R
thJL
;
Pd = Forward Power Loss = I
F(AV)
x V
FM
@ (I
F(AV)
/
D) (see Fig. 5);
Pd
REV
= Inverse Power Loss = V
R1
x I
R
(1 - D); I
R
@ V
R1
= 80% rated V
R
0
0 .4
0 .8
1 .2
1 .6
2
0
1
2
3
D C
Av
e
r
a
g
e
P
o
w
e
r
L
o
s
s
-
(
W
a
t
t
s
)
F(AV)
RM S Lim it
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
A verage Forw ard C urren t - I
(A )
10
100
1000
10
100
1000
10000
FS
M
N
o
n
-
R
e
p
e
ti
ti
v
e
S
u
r
g
e
C
u
r
r
e
n
t
-
I
(
A
)
p
At An y Rated Load C ondition
An d W ith Rated V
Applied
Followin g Surg e
RRM
Square W ave Pulse D uration - t
(m icrosec)
0
3 0
6 0
9 0
1 20
1 50
0
1
2
3
D C
F(AV)
see note (2)
A verage Forw ard C urren t - I
(A )
Square w ave (D = 0.50)
80% Rated V
applied
R
A
l
l
o
w
a
bl
e
L
e
a
d
T
e
m
pe
r
a
t
u
r
e
-
(
C)
= 1/8 inch
21DQ04
Bulletin PD-20707 rev. C 03/03
5
www.irf.com
Ordering Information Table
Device Code
1
5
2
4
3
1
-
21 = 2.1A (Axial and small packages - Current is x10)
2
-
D = DO-41 package
3
-
Q = Schottky Q.. Series
4
-
04 = Voltage Rating : 40V
5
-
TR = Tape & Reel package ( 5000 pcs)
TB = Tape & Box package (Ammunition -3000 pcs)
-
= Box package (1000 pcs)
21
D
Q
04
TR
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7309
Visit us at www.irf.com for sales contact information. 03/03
Data and specifications subject to change without notice.
This product has been designed and qualified for Industrial Level.
Qualification Standards can be found on IR's Web site.
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