National Semiconductor · Electronic Components
LM340K-12
Analog IC; verify datasheet
Part NumberLM340K-12
ManufacturerNational Semiconductor
AvailabilityIn stock — ships fast
Specifications
NSN5962-01-006-7942 (NSN)
Federal Item NameMICROCIRCUIT,LINEAR
Operating Temp Range+0.0 TO 70.0 CELSIUS
Storage Temp Range-65.0 TO 150.0 CELSIUS
Max Power Dissipation4.0 WATTS
Design Function1 REGULATOR, VOLTAGE
Enclosure ConfigurationCAN
Enclosure MaterialGLASS AND METAL
Terminal Surface TreatmentTIN
Features ProvidedMONOLITHIC AND HERMETICALLY SEALED AND POSITIVE OUTPUTS AND FIXED AND INTERNALLY COMPENSATED
Case Outline DesignatorT0-3 JOINT ELECTRON DEVICE ENGINEERING COUNCIL
Body Width1.050 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 LM340K-12 in stock?
Yes — LM340K-12 is in our stock database. Request a quote for current pricing and lead time.
Is LM340K-12 by National Semiconductor obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If LM340K-12 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 LM340K-12?
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 LM340K-12?
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.