MIL-SPEC · Electronic Components
RTH42ES221K
Resistor, Thermal
Part NumberRTH42ES221K
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5905-00-476-7963 (NSN)
Federal Item NameRESISTOR,THERMAL
Federal Supply Class5905 — Resistors
Power Dissipation Constant In Mill2.5
Temp Points For Resistance Reading0.0 CELSIUS THIRD RESISTANCE-TEMPERATURE POINT
Zero Power Resistance Tolerance In-10.0 TO 10.0
Resistance Tolerance At A Specifie-14.0 TO 14.0 FIFTH RESISTANCE-TEMPERATURE POINT
Zero Power Resistance At Specified184.4 OHMS THIRD RESISTANCE-TEMPERATURE POINT
Zero Power Resistance220.000 OHMS
Inclosure TypeHERMETICALLY SEALED
Style DesignatorROD
Test Data Document81349-MILT23648 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA
Terminal Type And Quantity2 WIRE LEAD
Maximum Power Dissipation Rating250.00 MILLIWATTS
ESD/EMICode B — ESD/EMI sensitive item
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 RTH42ES221K available?
We can source RTH42ES221K 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 RTH42ES221K by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If RTH42ES221K 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 RTH42ES221K?
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 RTH42ES221K?
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.