STMicroelectronics · Electronic Components
BF259
TRANSISTOR NPN VIDEO HV TO-39
Part NumberBF259
ManufacturerSTMicroelectronics
AvailabilityAvailable to order — request a quote
Specifications
NSN5961-01-193-6330 (NSN)
Federal Item NameTRANSISTOR
Current Rating50.00 MICROAMPERES MAXIMUM COLLECTOR CUTOFF CURRENT, DC, EMITTER OPEN
Terminals3 UNINSULATED WIRE LEAD
Mounting MethodTERMINAL
Overall Length0.250 INCHES MINIMUM
Overall Diameter0.360 INCHES NOMINAL
Special FeaturesJUNCTION PATTERN ARRANGEMENT: NPN
Voltage Rating In Volts Per Charac300.0 NOMINAL COLLECTOR TO BASE VOLTAGE/STATIC/EMITTER OPEN
Internal ConfigurationJUNCTION CONTACT
Maximum Operating Temp Per Measure175.0 CELSIUS JUNCTION
Joint Electronic Device EngineerinTO-39
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 BF259 available?
We can source BF259 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 BF259 by STMicroelectronics obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If BF259 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 BF259?
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 BF259?
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.