Siliconix Incorporated · Electronic Components
U257
TRANSISTOR — NSN 5961-01-091-2836
Part NumberU257
ManufacturerSiliconix Incorporated
AvailabilityAvailable to order — request a quote
Specifications
NSN5961-01-091-2836 (NSN)
Federal Item NameTRANSISTOR
Federal Supply Class5961 — Semiconductor Devices And Associated Hardware
Current Rating50.00 MILLIAMPERES MAXIMUM GATE CURRENT
Terminals7 UNINSULATED WIRE LEAD
Mounting MethodTERMINAL
Overall Length0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM
Overall Diameter0.305 INCHES MINIMUM AND 0.335 INCHES MAXIMUM
Semiconductor MaterialSILICON
Power Rating Per Characteristic500.0 MILLIWATTS MAXIMUM TOTAL DEVICE DISSIPATION
Maximum Operating Temp Per Measure150.0 CELSIUS AMBIENT AIR
Joint Electronic Device EngineerinT0-78
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 U257 available?
We can source U257 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 U257 by Siliconix Incorporated obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If U257 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 U257?
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 U257?
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.