MIL-SPEC · Electronic Components
RER40F1240R
Resistor, Fixed, Wire Wound, Nonind
Part NumberRER40F1240R
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5905-01-010-9891 (NSN)
Federal Item NameRESISTOR,FIXED,WIRE WOUND,NONIND
Federal Supply Class5905 — Resistors
Temp Coefficient Of Resistance In-30.0 TO 30.0
Heat Sink Thickness0.040 INCHES0.040 INCHES
Heat Sink Length6.000 INCHES6.000 INCHES
Ambient Temp In Deg Celsius At Zer275.0275.0
Inclosure TypeENCASEDENCASED
Distance Between Centerlines Of Mo0.444 INCHES NOMINAL0.444 INCHES NOMINAL
Ambient Temp At Full Rated Power25.0 CELSIUS25.0 CELSIUS
MaterialALUMINUM ALLOY HEAT SINK
Heat Sink Height2.000 INCHES2.000 INCHES
Body Length0.600 INCHES NOMINAL0.600 INCHES NOMINAL
Heat Sink Width4.000 INCHES4.000 INCHES
ESD/EMICode A — 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 RER40F1240R available?
We can source RER40F1240R 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 RER40F1240R by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If RER40F1240R 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 RER40F1240R?
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 RER40F1240R?
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.