MIL-SPEC · Electronic Components
RTH42ES221J
Resistor, Thermal
Part NumberRTH42ES221J
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5905-00-001-5856 (NSN)
Federal Item NameRESISTOR,THERMAL
Federal Supply Class5905 — Resistors
Zero Power Resistance At Specified7.4 KILOHMS FOURTH RESISTANCE-TEMPERATURE POINT
Body Length0.285 INCHES NOMINAL
Zero Power Resistance5.100 KILOHMS
Resistance Tolerance At A Specifie-15.0 TO 15.0 FIRST RESISTANCE-TEMPERATURE POINT
Temp Points For Resistance Reading125.0 CELSIUS SIXTH RESISTANCE-TEMPERATURE POINT
Style DesignatorROD
Terminal Type And Quantity2 WIRE LEAD
Thermal Time Constant In Seconds60.0
Ambient Temp At Full Rated Power25.0 CELSIUS
Terminal Diameter0.020 INCHES NOMINAL
Test Data Document81349-MILT23648 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA
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 RTH42ES221J available?
We can source RTH42ES221J 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 RTH42ES221J by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If RTH42ES221J 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 RTH42ES221J?
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 RTH42ES221J?
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.