National Semiconductor · Integrated Circuits > Timers
LM556J
Dual 555-type precision timer
Part NumberLM556J
ManufacturerNational Semiconductor
AvailabilityAvailable to order — request a quote
Specifications
NSN5962-01-115-5547 (NSN)
Federal Item NameMICROCIRCUIT,LINEAR
Operating Temp Range-55.0 TO 125.0 CELSIUS
Storage Temp Range-65.0 TO 150.0 CELSIUS
Max Power Dissipation600.0 MILLIWATTS
Design Function2 TIMER
Overall Height0.325 INCHES NOMINAL
Enclosure ConfigurationDUAL-IN-LINE
Enclosure MaterialCERAMIC
Terminal Surface TreatmentSOLDER
Features ProvidedRESETTABLE AND MONOLITHIC AND W/RESISTOR
Body Height0.200 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 LM556J available?
We can source LM556J 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 LM556J by National Semiconductor obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If LM556J 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 LM556J?
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 LM556J?
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.