The Transformer,audio Frequency, cataloged under National Stock Number 5950-00-227-7781, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lucent Technologies Inc Corporate Headquarters. Government technical data includes 17 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5950-00-227-7781 |
| Primary Part Number | ES0637747 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Lucent Technologies Inc Corporate Headquarters |
| Status | ACTIVE |
| Mounting Facility Quantity | 2 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSED |
| Mounting Method | THREADED HOLE(S) SINGLE GROUP |
| Body Width | 1.188 INCHES NOMINAL IN |
| Body Height | 0.594 INCHES NOMINAL IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 30.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 8330.0 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Distance Between Mounting Facility Centers | 0.562 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Nominal Thread Size | 0.164 INCHES SINGLE GROUP IN |
| Body Length | 1.688 INCHES NOMINAL IN |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 300.0 HERTZ MINIMUM AND 3.0 KILOHERTZ MAXIMUM SINGLE COMPONENT |
| Thread Quantity Per Inch | 32 SINGLE GROUP |
| Primary to Secondary Turn Ratio | 1 TO 17 SINGLE COMPONENT |
| Terminal Type and Quantity | 4 TAB, SOLDER LUG |
| 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 |
|---|---|
| ES0637747 PRIMARY | Lucent Technologies Inc Corporate Headquarters (USA) |
| KS8715 | Lucent Technologies Inc Corporate Headquarters (USA) |
| Reference | Meaning |
|---|---|
| ES0637747 | 5/9 Secondary reference At and T Corp |
| KS8715 | 5/9 Secondary reference American Telephone and Telegraph Co |
| ES0637747 | 5/9 Secondary reference Lucent Technologies Inc Dba Federal Marketing Group |
| 98-4005 | 5/9 Secondary reference L3harris Technologies, Inc. Dba Harris Corporation |
| KS8715 | 5/9 Secondary reference Lucent Technologies Inc Dba Federal Marketing Group |
| ES0637747 | 3/9 Design control — primary reference American Telephone and Telegraph Co |
| KS8715 | 5/9 Secondary reference At and T Corp |
NSN 5950-00-227-7781 is a Transformer,audio Frequency, manufactured by Lucent Technologies Inc Corporate Headquarters, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-00-227-7781 has 2 manufacturer part numbers on file: ES0637747 (Lucent Technologies Inc Corporate Headquarters), KS8715 (Lucent Technologies Inc Corporate Headquarters).
1 possible match (shared part number, not a government interchangeability claim): 4940-01-262-4937. Verify interchangeability with system specifications before substitution.
Key specifications for ES0637747: Mounting Facility Quantity: 2 SINGLE GROUP; Inclosure Type: FULLY INCLOSED; Mounting Method: THREADED HOLE(S) SINGLE GROUP; Body Width: 1.188 INCHES NOMINAL IN. 17 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.