ON Semiconductor · Electronic Components
BD439
TRANS NPN 60V 4A BIPO TO-225AA
Part NumberBD439
ManufacturerON Semiconductor
AvailabilityAvailable to order — request a quote
Specifications
NSN5961-01-265-2159 (NSN)
Federal Item NameTRANSISTOR
MaterialPLASTIC ENCLOSURE
Current Rating4.00 AMPERES MAXIMUM COLLECTOR CURRENT, DC AND 1.00 AMPERES MAXIMUM BASE CURRENT, DC
Terminals3 UNINSULATED WIRE LEAD
Mounting MethodTERMINAL AND UNTHREADED HOLE(S)
Overall Length0.450 INCHES MAXIMUM
Overall Width0.330 INCHES MAXIMUM
Overall Height0.120 INCHES MAXIMUM
Special FeaturesJUNCTION PATTERN ARRANGEMENT: NPN
Transfer Ratio20.0 MINIMUM STATIC FORWARD CURRENT TRANSFER RATIO, COMMON-EMITTER
Internal ConfigurationJUNCTION CONTACT
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 BD439 available?
We can source BD439 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 BD439 by ON Semiconductor obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If BD439 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 BD439?
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 BD439?
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.