Magnespec · Electronic Components
AU-3981
Transformer, Audio Frequency
Part NumberAU-3981
ManufacturerMagnespec
AvailabilityAvailable to order — request a quote
Specifications
NSN5950-00-575-3545 (NSN)
Federal Item NameTRANSFORMER,AUDIO FREQUENCY
Federal Supply Class5950 — Coils and Transformers
Mounting MethodBRACKET(S) AND UNTHREADED HOLE(S) SINGLE GROUP
Mounting Facility Quantity2 SINGLE GROUP
Impedance Rating In Ohms50.0 NOMINAL AND 250.0 NOMINAL AND 600.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY
Body Width1.500 INCHES NOMINAL
Frequency Rating70.0 HERTZ MINIMUM AND 7.0 KILOHERTZ MAXIMUM SINGLE COMPONENT
Body Height1.625 INCHES NOMINAL
Distance Between Mounting Facility2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP
Winding Function And Quantity1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT
Body Length1.938 INCHES NOMINAL
Inclosure TypeFULLY INCLOSED
Mounting Hole Diameter0.188 INCHES NOMINAL SINGLE GROUP
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 AU-3981 available?
We can source AU-3981 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 AU-3981 by Magnespec obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If AU-3981 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 AU-3981?
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 AU-3981?
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.