I R1 I R2 I R3 I R4 C T1 C T2
TYPES V R@
V RV R = 20 V V R = V RWM V R =V
R =
= 20 V = V RWM TA= 150°C TA= 150°C 0V 1.5V
nA dc µA dc µA dc µA dc pF pF
1N6638 35 0.5 50 100 2.5 2.0
1N6642 25 0.5 50 100 5.0 2.8
1N6643 50 0.5 75 160 5.0 2.8
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
V BR V RWM V F1 V F2 @I
F2 t fr t rr
TYPES @ I RI FM I F
=100µA = 10 mA = 50 mA
(Pulsed) (Pulsed)
V(PK) V(PK) V dc V dc mA ns ns
(min)
1N6638 150 125 0.8 1.1 200 20 4.5
1N6642 100 75 1.0 1.2 100 20 5.0
1N6643 75 50 1.0 1.2 100 20 6.0
MAXIMUM RATINGS
Operating Temperature: -65°C to +175°C
Storage Temperature: -65°C to +175°C
Operating Current: 300 mA
Derating: 3.0 mA/°C Above TL = + 75°C @L = 3/8”
Surge Current: I
FSM
= 2.5A, half sine wave, Pw= 8.3ms
ELECTRICAL CHARACTERISTICS @ 25°C, unless otherwise specified.
• 1N6638,1N6642, 1N6643 AVAILABLE IN JAN, JANTX, JANTXV, AND JANS
PER MIL-PRF-19500/578
• SWITCHING DIODES
• NON-CAVITY GLASS PACKAGE
• METALLURGICALLY BONDED
1N6638
1N6642
1N6643
DESIGN DATA
CASE: Hermetically sealed, “D” Body
per MIL-PRF- 19500/578. D-5D
LEAD MATERIAL: Copper clad steel
LEAD FINISH: Tin / Lead
THERMAL RESISTANCE: (ROJL): 160
°C/W maximum at L = .375
THERMAL IMPEDANCE: (ZOJX): 25
°C/W maximum
POLARITY: Cathode end is banded.
MOUNTING POSITION: Any
FIGURE 1
0.056/0.075
1.42/1.91
0.140/0.180
3.55/4.57
1.00
25.4
0.018/0.022
0.46/0.56
POLARITY
BAND
(CATHODE)
IN6638, IN6642 and IN6643
.2 .3 .4 .5 .6 .7 .8 .9 1.0 1.1 1.2
VF - Forward Voltage (V)
FIGURE 2
Typical Forward Current
vs Forward Voltage
IF- Forward Current - (mA)
1000
100
10
1
0.1
150ºC
100ºC
25ºC
-65ºC
20 40 60 80 100 120 140
Percent of Reverse Working Voltage (%)
FIGURE 3
Typical Reverse Current
vs Reverse Voltage
IR- Reverse Current - (µA)
1000
100
10
1
0.1
.01
.001
150ºC
100ºC
25ºC
-65ºC
NOTE : All temperatures shown on graphs are
junction temperatures
