The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-578-1111, 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 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-00-578-1111 |
| Primary Part Number | AU4003B |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Magnespec Inc |
| Status | ACTIVE |
| Transformer Function | LINE |
| Inclosure Type | OPEN |
| Mounting Method | TERMINAL SINGLE GROUP |
| Body Width | 0.458 INCHES MAXIMUM IN |
| Body Height | 0.625 INCHES MAXIMUM IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 1000.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Impedance Rating in Ohms | 20000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Body Length | 0.780 INCHES MAXIMUM IN |
| Winding Operating Current | 2.0 MILLIAMPERES AC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 400.0 HERTZ NOMINAL SINGLE COMPONENT |
| Primary to Secondary Turn Ratio | 1 TO 4.35 SINGLE COMPONENT |
| Terminal Type and Quantity | 4 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 |
|---|---|
| AU4003B | Magnespec Inc (USA) |
| AR432 | Magnetika Inc (USA) |
| AU403 | Magnespec Inc (USA) |
| Reference | Meaning |
|---|---|
| 311903 | 5/9 Secondary reference Te Connectivity Networks, Inc. Div Adc Telecommunications Sales, Inc. |
| AU403 | 5/9 Secondary reference U.S. Government activity |
| AU4003B | 5/9 Secondary reference U.S. Government activity |
| 441713 | 3/2 Design control — primary reference U.S. Government activity |
| 1993023-1 | 5/9 Secondary reference U.S. Government activity |
| A11903 | 5/9 Secondary reference Te Connectivity Networks, Inc. Div Adc Telecommunications Sales, Inc. |
| AR432 | 5/9 Secondary reference U.S. Government activity |
NSN 5950-00-578-1111 is a Transformer,audio Frequency, manufactured by Magnespec Inc, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-578-1111 has 3 manufacturer part numbers on file: AU4003B (Magnespec Inc), AR432 (Magnetika Inc), AU403 (Magnespec Inc).
Key specifications for AU4003B: Transformer Function: LINE; Inclosure Type: OPEN; Mounting Method: TERMINAL SINGLE GROUP; Body Width: 0.458 INCHES MAXIMUM 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.