The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-487-7904, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-00-487-7904 |
| Primary Part Number | 661561 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Mounting Facility Quantity | 2 SINGLE GROUP2 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSEDFULLY INCLOSED |
| Mounting Method | THREADED HOLE(S) SINGLE GROUP |
| Body Width | 1.562 INCHES MAXIMUM1.562 INCHES MAXIMUM IN |
| Body Height | 2.219 INCHES MAXIMUM IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 2880.0 MAXIMUM SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 4500.0 MAXIMUM SINGLE COMPONENT SINGLE SECONDARY4500.0 MAXIMUM SINGLE COMPONENT SINGLE SECONDARY |
| Winding Shielding Method | INTERNAL SHIELD BROUGHT OUT TO TERMINAL AND GROUND BROUGHT OUT TO TERMINAL AND CORE GROUNDED AND BROUGHT OUT TO TERMINAL SINGLE COMPONENT |
| Distance Between Mounting Facility Centers | 1.812 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP1.812 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Nominal Thread Size | 0.138 INCHES SINGLE GROUP0.138 INCHES SINGLE GROUP IN |
| Maximum Operating Temp | 105.0 CELSIUS105.0 CELSIUS DEGC |
| Body Length | 1.938 INCHES MAXIMUM1.938 INCHES MAXIMUM IN |
| Winding Operating Current | 1.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY1.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 400.0 HERTZ MAXIMUM SINGLE COMPONENT400.0 HERTZ MAXIMUM SINGLE COMPONENT |
| Thread Quantity Per Inch | 32 SINGLE GROUP |
| Primary to Secondary Turn Ratio | 1 TO 1-13/64 SINGLE COMPONENT |
| Terminal Type and Quantity | 9 WIRE HOOK9 WIRE HOOK |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP |
| 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 |
|---|---|
| PEI 3648 | Precision Electronics, Inc (USA) |
| 661561 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| Reference | Meaning |
|---|---|
| 661561 | C/1 Advisory reference — outside the item-of-supply concept Honeywell International Inc. Dba Honeywell International |
NSN 5950-00-487-7904 is a Transformer,audio Frequency, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-487-7904 has 2 manufacturer part numbers on file: PEI 3648 (Precision Electronics, Inc), 661561 (Lockheed Martin Corporation Div Rms - Mitchel Field).
Key specifications for 661561: Overall Height: 2.734 INCHES MAXIMUM2.734 INCHES MAXIMUM IN; Mounting Facility Quantity: 2 SINGLE GROUP2 SINGLE GROUP; Inclosure Type: FULLY INCLOSEDFULLY INCLOSED; Mounting Method: THREADED HOLE(S) SINGLE GROUP. 20 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.