STMicroelectronics · Electronic Components
BU931
TRANSISTOR DARL NPN TO-3
Part NumberBU931
ManufacturerSTMicroelectronics
AvailabilityAvailable to order — request a quote
Specifications
NSN5961-01-581-0616 (NSN)
Federal Item NameTRANSISTOR
Current Rating15.00 AMPERES NOMINAL FORWARD CURRENT, AVERAGE
Terminals2 PIN
Mounting MethodUNTHREADED HOLE(S)
Overall Length38.50 MILLIMETERS MINIMUM AND 39.30 MILLIMETERS MAXIMUM
Overall Width25.00 MILLIMETERS MINIMUM AND 26.00 MILLIMETERS MAXIMUM
Overall Height19.32 MILLIMETERS MINIMUM AND 22.02 MILLIMETERS MAXIMUM
Overall Diameter25.00 MILLIMETERS MINIMUM AND 26.00 MILLIMETERS MAXIMUM
Joint Electronic Device EngineerinTO-3
Internal Junction ConfigurationNPN
Voltage Rating In Volts Per Charac400.0 NOMINAL REACH THROUGH VOLTAGE
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 BU931 available?
We can source BU931 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 BU931 by STMicroelectronics obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If BU931 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 BU931?
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 BU931?
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.