The Semiconductor Device,diode, cataloged under National Stock Number 5961-01-225-5404, 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 Littelfuse, Inc.. Government technical data includes 8 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5961-01-225-5404 |
| Primary Part Number | 1.5KE51A |
| Item Name | Semiconductor Device,diode |
| FSC / FSG | 5961 / 59 — Semiconductor Devices and Associated Hardware |
| Manufacturer | Littelfuse, Inc. |
| Status | ACTIVE |
| Voltage Rating in Volts Per Characteristic | 43.6 MAXIMUM REVERSE VOLTAGE, INSTANTANEOUS |
| Overall Diameter | 0.200 INCHES NOMINAL IN |
| Mounting Method | TERMINAL |
| Current Rating Per Characteristic | 21.40 AMPERES MAXIMUM PEAK PULSE CURRENT |
| Material | SILICON SEMICONDUCTOR |
| Material | PLASTIC ENCLOSURE |
| Terminal Type and Quantity | 2 UNINSULATED WIRE LEAD |
| Power Rating Per Characteristic | 1500.0 WATTS MAXIMUM TOTAL 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 |
|---|---|
| 99134986 | Thales Sa (FRA) |
| 40097547 | Ministry of Defence, Future Aircraft Carrier Ipt (cvf Ipt) (GBR) |
| 1.5KE51A PRIMARY | Littelfuse, Inc. (USA) |
| Reference | Meaning |
|---|---|
| RELEASE 6741 | 5/9 Secondary reference U.S. Government activity |
| 1N6288A | 5/9 Secondary reference U.S. Government activity |
| 1.5KE51A | 5/9 Secondary reference General Semiconductor Industries Inc |
| 1N6288A | 5/9 Secondary reference General Semiconductor Industries Inc |
| 1.5KE51A | 5/9 Secondary reference Protek Devices Lp Dba Protek Devices |
NSN 5961-01-225-5404 is a Semiconductor Device,diode, manufactured by Littelfuse, Inc., classified under FSC 5961, Semiconductor Devices and Associated Hardware. Status: active.
NSN 5961-01-225-5404 has 3 manufacturer part numbers on file: 99134986 (Thales Sa), 40097547 (Ministry of Defence, Future Aircraft Carrier Ipt (cvf Ipt)), 1.5KE51A (Littelfuse, Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 5961-01-279-3726, 5961-01-389-1485, 5961-01-725-7056. Verify interchangeability with system specifications before substitution.
Key specifications for 1.5KE51A: Voltage Rating in Volts Per Characteristic: 43.6 MAXIMUM REVERSE VOLTAGE, INSTANTANEOUS; Overall Diameter: 0.200 INCHES NOMINAL IN; Mounting Method: TERMINAL; Overall Length: 0.370 INCHES NOMINAL IN. 8 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.