Vishay · Electronic Components
U421
SEMICONDUCTOR DEVICES,UNITIZED — NSN 5961-01-113-1661
Part NumberU421
ManufacturerVishay
AvailabilityAvailable to order — request a quote
Specifications
NSN5961-01-113-1661 (NSN)
Federal Item NameSEMICONDUCTOR DEVICES,UNITIZED
Current Rating10.00 MICROAMPERES MAXIMUM GATE CURRENT AND 10.00 MICROAMPERES MAXIMUM GATE CURRENT AND 10.00 MILLIAMPERES MAXIMUM FOR
Terminals8 UNINSULATED WIRE LEAD8 UNINSULATED WIRE LEAD
Mounting MethodTERMINALTERMINAL
Overall Length0.165 INCHES MINIMUM AND 0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM0.185 INCHES MAXIMUM
Overall Diameter0.335 INCHES MINIMUM AND 0.335 INCHES MINIMUM AND 0.370 INCHES MAXIMUM0.370 INCHES MAXIMUM
Component Name And Quantity2 TRANSISTOR2 TRANSISTOR
Joint Electronic Device EngineerinTO-78TO-78
Terminal Length0.500 INCHES MINIMUM0.500 INCHES MINIMUM
Terminal Circle Diameter0.200 INCHES NOMINAL0.200 INCHES NOMINAL
Semiconductor MaterialSILICON ALL TRANSISTORSILICON ALL TRANSISTOR
Federal Supply Class5961 — Semiconductor Devices And Associated Hardware
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is U421 available?
We can source U421 even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is U421 by Vishay obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If U421 has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like U421?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for U421?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.