DGS 19-025AS
DGS 20-025A(S)
DGSK 40-025A(S)
Gallium Arsenide Schottky Rectifier
I
DC
= 18 A
V
RRM
= 250 V
C
Junction
= 26 pF
Type
DGS 19-025AS
Marking on product
19A250AS
Single
A
Circuit
C
Package
A = Anode, C = Cathode , TAB = Cathode
TO-252 AA
A
A
C (TAB)
DGS 20-025A
DGS 20-025AS
DGS 20-025A
DGS 20-025AS
A
C
Single
TO-220 AC
TO-263 AB
TO-220 AB
C
A
A
A
C (TAB)
C (TAB)
DGSK 40-025A
DGSK 40-025AS
DGSK 40-025A
DGSK 40-025AS
Common cathode
A
C
A
A
C
A
C (TAB)
TO-263 AB
A
A
C (TAB)
Symbol
V
RRM/RSM
I
FAV
I
FAV
I
FSM
T
VJ
T
stg
P
tot
M
d
Conditions
Maximum Ratings
250
V
A
A
A
°C
°C
W
Nm
Features
●
●
T
C
= 25°C; DC
T
C
= 90°C; DC
T
VJ
= 45°C; t
p
= 10 ms (50 Hz), sine
18
13
30
-55...+175
-55...+150
●
●
●
●
●
T
C
= 25°C
mounting torque (TO-220)
48
0.4...0.6
Low forward voltage
Very high switching speed
Low junction capacity of GaAs
- low reverse current peak at turn off
Soft turn off
Temperature independent switching
behaviour
High temperature operation capability
Epoxy meets UL 94V-0
Applications
●
MHz switched mode power supplies
(SMPs)
Symbol
I
R
V
F
C
J
R
thJC
R
thCH
Weight
Pulse test:
Conditions
V
R
= V
RRM
;
V
R
= V
RRM
;
I
F
= 7.5 A;
I
F
= 7.5 A;
T
VJ
= 25°C
T
VJ
= 125°C
T
VJ
= 125°C
T
VJ
= 25°C
Characteristic Values
typ.
max.
2.0
2.0
1.3
1.2
26
3.1
1.5
mA
mA
V
V
pF
K/W
K/W
g
g
●
●
●
Small size SMPs
High frequency converters
Resonant converters
V
R
= 100 V; T
VJ
= 125°C
TO-220/263
TO-252
TO-220/263
Pulse Width = 5 ms, Duty Cycle < 2.0 %
0.5
0.3
2
Data according to IEC 60747 and per diode
unless otherwise specified
IXYS reserves the right to change limits, test conditions and dimensions
© 2004 IXYS All rights reserved
1-3
0435
DGS 19-025AS
DGS 20-025A(S)
DGSK 40-025A(S)
30
10
A
I
F
1
C
J
300
pF
100
0,1
T
VJ
=
125°C
25°C
T
VJ
= 125°C
0,01
0,0
0,5
1,0
1,5
V
F
2,0 V 2,5
10
0,1
1
10
100 V 1000
V
R
Fig. 1 typ. forward characteristics
Fig. 2 typ. junction capacity
versus blocking voltage
10
K/W
1
Z
thJC
0,1
Single Pulse
TO-252
TO-220
0,01
DGS 20-022/025A
0,00001
0,0001
0,001
0,01
0,1
1
t
s
10
Fig. 3 typ. thermal impedance junction to case
Note:
explanatory comparison of the basic operational behaviour of rectifier diodes and Gallium Arsenide
Schottky diodes:
conduction
forward characteristics
turn off characteristics
turn on characteristics
Rectifier Diode
by majority + minority carriers
V
F
(I
F
)
extraction of excess carriers
causes temperature dependant
reverse recovery (t
rr
, I
RM
, Q
rr
)
delayed saturation leads to V
FR
GaAs Schottky Diode
by majority carriers only
V
F
(I
F
), see Fig. 1
reverse current charges
junction capacity C
J
, see Fig. 2;
not temperature dependant
no turn on overvoltage peak
0435
IXYS reserves the right to change limits, test conditions and dimensions
© 2004 IXYS All rights reserved
2-3
DGS 19-025AS
DGS 20-025A(S)
DGSK 40-025A(S)
Outlines TO-220
Dim.
A
B
C
D
E
F
G
H
J
K
M
N
Q
R
Millimeter
Min. Max.
12.70 13.97
14.73 16.00
9.91 10.66
3.54
4.08
5.85
6.85
2.54
3.18
1.15
1.65
2.79
5.84
0.64
1.01
2.54
BSC
4.32
4.82
1.14
1.39
0.38
0.56
2.29
2.79
Inches
Min. Max.
0.500 0.550
0.580 0.630
0.390 0.420
0.139 0.161
0.230 0.270
0.100 0.125
0.045 0.065
0.110 0.230
0.025 0.040
0.100
BSC
0.170 0.190
0.045 0.055
0.015 0.022
0.090 0.110
Outlines
TO-252
Dim.
A
A1
A2
b
b1
b2
c
c1
D
D1
E
E1
e
e1
H
L
L1
L2
L3
Millimeter
Min. Max.
2.19 2.38
0.89 1.14
0 0.13
0.64 0.89
0.76 1.14
5.21 5.46
0.46 0.58
0.46 0.58
5.97 6.22
4.32 5.21
6.35 6.73
4.32 5.21
2.28 BSC
4.57 BSC
9.40 10.42
0.51 1.02
0.64 1.02
0.89 1.27
2.54 2.92
Inches
Min.
Max.
0.086
0.094
0.035
0.045
0
0.005
0.025
0.035
0.030
0.045
0.205
0.215
0.018
0.023
0.018
0.023
0.235
0.245
0.170
0.205
0.250
0.265
0.170
0.205
0.090 BSC
0.180 BSC
0.370
0.410
0.020
0.040
0.025
0.040
0.035
0.050
0.100
0.115
1 Anode
2 NC
3 Anode
4 Cathode
Outline
TO-263
Dim.
A
A1
b
b2
c
c2
D
D1
E
E1
e
L
L1
L2
L3
L4
R
Millimeter
Min.
Max.
4.06
2.03
0.51
1.14
0.46
1.14
8.64
8.00
4.83
2.79
0.99
1.40
0.74
1.40
9.65
8.89
Inches
Min. Max.
.160
.080
.020
.045
.018
.045
.340
.315
.190
.110
.039
.055
.029
.055
.380
.350
9.65
10.29
6.22
8.13
2.54 BSC
14.61
2.29
1.02
1.27
0
0.46
15.88
2.79
1.40
1.78
0.20
0.74
.380
.405
.245
.320
.100 BSC
.575
.090
.040
.050
0
.018
.625
.110
.055
.070
.008
.029
0435
IXYS reserves the right to change limits, test conditions and dimensions
© 2004 IXYS All rights reserved
3-3
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