STMicroelectronics · Electronic Components
SD1240-H1
TRANSISTOR — NSN 5961-01-059-3720
Part NumberSD1240-H1
ManufacturerSTMicroelectronics
AvailabilityAvailable to order — request a quote
Specifications
NSN5961-01-059-3720 (NSN)
Federal Item NameTRANSISTOR
Federal Supply Class5961 — Semiconductor Devices And Associated Hardware
MaterialCERAMIC ENCLOSURE
Current Rating0.15 AMPERES MAXIMUM BASE CURRENT, DC AND 0.50 AMPERES MAXIMUM COLLECTOR CURRENT, DC
Terminals4 RIBBON
Mounting MethodTHREADED STUD(S)
Overall Length0.145 INCHES MINIMUM AND 0.165 INCHES MAXIMUM
Overall Diameter0.355 INCHES MINIMUM AND 0.375 INCHES MAXIMUM
Special FeaturesJUNCTION PATTERN ARRANGEMENT: NPN
Power Rating Per Characteristic10.0 WATTS MAXIMUM TOTAL POWER DISSIPATION
Nominal Thread Size0.164 INCHES
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 SD1240-H1 available?
We can source SD1240-H1 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 SD1240-H1 by STMicroelectronics obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If SD1240-H1 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 SD1240-H1?
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 SD1240-H1?
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.