Fairchild · Transistors / FETs
4N25
Transistor Output Optocouplers Phototransistor Output Optocoupler
Part Number4N25
ManufacturerFairchild
AvailabilityCheck availability — request a quote
Specifications
NSN5962-01-659-2804 (NSN)
Federal Item NameMICROCIRCUIT,LINEAR
Enclosure MaterialPLASTIC
Body Height0.215 INCHES MINIMUM AND 0.350 INCHES MAXIMUM
Body Length0.320 INCHES MINIMUM AND 0.350 INCHES MAXIMUM
Body Width0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM
Federal Supply Class5962 — Microcircuits, Electronic
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 4N25 available?
4N25 is a part RH Electronics stocks and sources — availability changes daily, so request a quote and we'll confirm current stock, pricing and lead time, usually within a few hours.
Is 4N25 by Fairchild obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 4N25 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 4N25?
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 4N25?
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.