• 1N6638US,1N6642US, 1N6643US AVAILABLE IN
JAN, JANTX, JANTXV
AND
JANS
PER MIL-PRF-19500/578
• 1N6638U,1N6642U, 1N6643U AVAILABLE IN
JAN, JANTX, JANTXV
AND
JANS
PER MIL-PRF-19500/578
• SWITCHING DIODES
• NON-CAVITY GLASS PACKAGE
• METALLURGICALLY BONDED
1N6638U & US
1N6642U & US
1N6643U & US
MAXIMUM RATINGS
Operating Temperature: -65°C to +175°C
Storage Temperature: -65°C to +175°C
Operating Current: 300 mA
Derating: 4.6 mA/°C Above TEC = + 110°C
Surge Current: I
FSM
= 2.5A, half sine wave, Pw = 8.3ms
ELECTRICAL CHARACTERISTICS
@ 25°C, unless otherwise specified.
V BR
TYPES
@ IR
=100 µA
V RWM
V F1
IFM
=10 mA
(Pulsed)
V (pk)
1N6638U & US
1N6642U & US
1N6643U & US
150
100
75
V (pk)
125
75
50
V dc
0.8
1.0
1.0
V dc
1.1
1.2
1.2
(Pulsed)
mA
200
100
100
V F2
@ I F2
tfr
IF
=50 mA
ns
20
20
20
trr
IR = 10 mA
IF = 10 mA
IREC = 1 mA
ns
4.5
5.0
6.0
DIM
D
F
G
S
MILLIMETERS
MIN
MAX
1.78
2.16
0.48
0.71
4.19
4.95
0.08MIN.
INCHES
MIN MAX
0.070 0.085
0.019 0.028
0.165 0.195
0.003MIN.
FIGURE 1
DESIGN DATA
CASE:
D-5D, Hermetically sealed glass
case, per MIL-PRF- 19500/578
LEAD FINISH:
Tin / Lead
I R1
TYPES
VR
= 20 V
nA dc
I R2
@V R
= V RWM
µA dc
I R3
V R = 20 V
TA = 150°C
µA dc
I R4
V R = V RWM
TA = 150°C
µA dc
C T1
VR=
0V
pF
C T2
VR=
1.5V
pF
THERMAL RESISTANCE: (R
OJEC):
50 °C/W maximum at L = 0
THERMAL IMPEDANCE: (Z
OJX): 25
°C/W maximum
POLARITY:
Cathode end is banded.
1N6638U & US
1N6642U & US
1N6643U & US
35
25
50
0.5
0.5
0.5
50
50
75
100
100
160
2.5
5.0
5.0
2.0
2.8
2.8
MOUNTING SURFACE SELECTION:
The Axial Coefficient of Expansion
(COE) of this device is approximately
+ 4PPM / °C. The COE of the Mounting
Surface System should be selected to
provide a suitable match with this
device.
22 COREY STREET, MELROSE, MASSACHUSETTS 02176
PHONE (781) 665-1071
FAX (781) 665-7379
WEBSITE: http://www.cdi-diodes.com
E-mail: mail@cdi-diodes.com
IN6638U&US, IN6642U&US
1000
and
IN6643U&US
100
IF - Forward Current - (mA)
10
15
0ºC
100
ºC
0.1
.2
.3
.4
.5
.6
.7
.8
.9
VF - Forward Voltage (V)
FIGURE 2
Typical Forward Current
vs Forward Voltage
1.0
1.1
1.2
1000
100
150ºC
10
IR - Reverse Current - (µA)
C
100º
1
0.1
25ºC
.01
-65ºC
-65ºC
1
25º
C
NOTE :
All temperatures shown on graphs are
junction temperatures
.001
20 40 60 80 100 120 140
Percent of Reverse Working Voltage (%)
FIGURE 3
Typical Reverse Current
vs Reverse Voltage
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