Fairchild 1N4938 service manual
Small Signal Diode
1N4938
1N4938
DO-35
Color Band Denotes Cathode
Absolute Maximum Ratings *
TA = 25°C unless otherwise noted
Symbol Parameter Value Units
V
RRM
I
F(AV)
I
FSM
T
STG
T
J
* These ratings are limiting values above which the serviceability of the diode may be impaired.
NOTES:
1) These ratings are based on a maximum junction temperature of 200 degrees C.
2) These are steady limits. The factory should be consulted on applications involving pulsed or low duty cycle operations.
Maximum Repetitive Reverse Voltage 200 V
Average Rectified Forward Current 500 mA
Non-repetitive Peak Forward Surge Current
Pulse Width = 1.0 second
Pulse Width = 1.0 microsecond
1.0
4.0
Storage Temperature Range -65 to +200 °C
Operating Junction Temperature 175 °C
Thermal Characteristics
Symbol Parameter Value Units
P
D
R
θJA
Electrical Characteristics
Symbol Parameter Test Conditions Min. Max. Units
V
R
V
F
I
R
C
T
t
rr
Power Dissipation 500 mW
Thermal Resistance, Junction to Ambient 300 °C/W
TA=25°C unless otherwise noted
Breakdown Voltage IR = 100µA 200 V
Forward Voltage IF = 100mA 1.0 V
Reverse Leakage VR = 75V
= 175V, TA = 175°C
V
R
100
100
Total Capacitance VR = 0V, f = 1MHz 5 pF
Reverse Recovery Time IF = 3mA, IR = 30mA
= 1mA, RL = 100Ω
I
rr
50 ns
A
A
nA
µA
©2004 Fairchild Semiconductor Corporation 1N4938, Rev. A1
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR
CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, or (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status Definition
Advance Information Form ative or In
Design
Preliminary First Production This datasheet contains preliminary data, and
No Identification Needed Full Production This datasheet contains final specifications. Fairchild
Obsolete Not In Production This datasheet contains specifications on a product
©2004 Fairchild Semiconductor Corporation
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. I13
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