The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-575-3545, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Magnespec Inc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-00-575-3545 |
| Primary Part Number | AU-3981 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Magnespec Inc |
| Status | ACTIVE |
| Mounting Facility Quantity | 2 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSED |
| Mounting Method | BRACKET(S) AND UNTHREADED HOLE(S) SINGLE GROUP |
| Body Width | 1.500 INCHES NOMINAL IN |
| Body Height | 1.625 INCHES NOMINAL IN |
| Mounting Hole Diameter | 0.188 INCHES NOMINAL SINGLE GROUP IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 18000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 50.0 NOMINAL AND 250.0 NOMINAL AND 600.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Distance Between Mounting Facility Centers | 2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Body Length | 1.938 INCHES NOMINAL IN |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 70.0 HERTZ MINIMUM AND 7.0 KILOHERTZ MAXIMUM SINGLE COMPONENT |
| Terminal Type and Quantity | 7 WIRE LEAD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| AU-3981 PRIMARY | Magnespec Inc (USA) |
| Reference | Meaning |
|---|---|
| 349-740 | 5/9 Secondary reference Rca Corp Government and Commercial Systems Commercial Commications Systems Div |
| A53XM0DPERREQMT3AAND3BAND15TRANS | 5/9 Secondary reference Magnetek Inc Huntington Div |
| A53XM0D | 5/9 Secondary reference Magnetek Inc Huntington Div |
| AU-3981 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5950-00-575-3545 is a Transformer,audio Frequency, manufactured by Magnespec Inc, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-575-3545 has 1 manufacturer part number on file: AU-3981 (Magnespec Inc).
1 possible match (shared part number, not a government interchangeability claim): 5307-01-575-8908. Verify interchangeability with system specifications before substitution.
Key specifications for AU-3981: Mounting Facility Quantity: 2 SINGLE GROUP; Inclosure Type: FULLY INCLOSED; Mounting Method: BRACKET(S) AND UNTHREADED HOLE(S) SINGLE GROUP; Body Width: 1.500 INCHES NOMINAL IN. 14 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.