The Transistor, cataloged under National Stock Number 5961-01-020-1668, is classified within Federal Supply Class 5961 (Semiconductor Devices and Associated Hardware) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Solitron Devices, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5961-01-020-1668 |
| Primary Part Number | F2657 |
| Item Name | Transistor |
| FSC / FSG | 5961 / 59 — Semiconductor Devices and Associated Hardware |
| Manufacturer | Solitron Devices, Inc. |
| Status | ACTIVE |
| Voltage Rating in Volts Per Characteristic | 50.0 MAXIMUM DRAIN TO GATE VOLTAGE |
| Overall Diameter | 0.209 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN |
| Precious Material | GOLD |
| Terminal Length | 0.500 INCHES MINIMUM IN |
| Mounting Method | TERMINAL |
| Semiconductor Material | SILICON |
| Internal Configuration | FIELD EFFECT |
| Features Provided | HERMETICALLY SEALED CASE |
| Current Rating Per Characteristic | 10.00 MILLIAMPERES MAXIMUM GATE CURRENT |
| Precious Material and Location | TERMINALS GOLD |
| Test Data Document | 82577-928806-2B DRAWING (THIS IS THE BASIC GOVERNING DRAWING, SUCH AS A CONTRACTOR DRAWING, ORIGINAL EQUIPMENT MANUFACTURER DRAWING, ETC.; EXCLUDES ANY SPECIFICATION, STANDARD OR OTHER DOCUMENT THAT MAY BE REFERENCED IN A BASIC GOVERNING DRAWING) |
| Terminal Type and Quantity | 3 UNINSULATED WIRE LEAD |
| Electrode Internally-Electrically Connected to Case | GATE |
| Power Rating Per Characteristic | 1.8 WATTS MAXIMUM COLLECTOR POWER DISSIPATION |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| F2657 | Solitron Devices, Inc. (USA) |
| Reference | Meaning |
|---|---|
| U2641 | 5/9 Secondary reference Telcom Semiconductor Inc |
| FN2991 | 5/9 Secondary reference Siliconix Incorporated Div Siliconix |
| 928806-2B | 3/2 Design control — primary reference U.S. Government activity |
NSN 5961-01-020-1668 is a Transistor, manufactured by Solitron Devices, Inc., classified under FSC 5961, Semiconductor Devices and Associated Hardware. Status: active.
NSN 5961-01-020-1668 has 1 manufacturer part number on file: F2657 (Solitron Devices, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5961-01-023-3437. Verify interchangeability with system specifications before substitution.
Key specifications for F2657: Voltage Rating in Volts Per Characteristic: 50.0 MAXIMUM DRAIN TO GATE VOLTAGE; Overall Diameter: 0.209 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN; Precious Material: GOLD; Terminal Length: 0.500 INCHES MINIMUM IN. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.