The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-903-2938, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Magnetika Inc. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5950-00-903-2938 |
| Primary Part Number | ER239 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Magnetika Inc |
| Status | ACTIVE |
| Inclosure Type | HERMETICALLY SEALED |
| Body Outside Diameter | 0.359 INCHES NOMINAL IN |
| Mounting Method | TERMINAL SINGLE GROUP |
| Maximum Transformer Power Rating | 500.0 MILLIWATTS SINGLE COMPONENT |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 1500.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 6000.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Body Length | 0.468 INCHES NOMINAL IN |
| Winding Operating Current | 3.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 1.0 KILOHERTZ MINIMUM AND 3.0 KILOHERTZ MAXIMUM SINGLE COMPONENT |
| Terminal Type and Quantity | 5 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 |
|---|---|
| ER239 PRIMARY | Magnetika Inc (USA) |
| 2158943PC1 | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| ER239 | 5/9 Secondary reference U.S. Government activity |
NSN 5950-00-903-2938 is a Transformer,audio Frequency, manufactured by Magnetika Inc, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-903-2938 has 2 manufacturer part numbers on file: ER239 (Magnetika Inc), 2158943PC1 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for ER239: Inclosure Type: HERMETICALLY SEALED; Body Outside Diameter: 0.359 INCHES NOMINAL IN; Mounting Method: TERMINAL SINGLE GROUP; Maximum Transformer Power Rating: 500.0 MILLIWATTS SINGLE COMPONENT. 12 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.