The Transistor, cataloged under National Stock Number 5961-01-507-4112, 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 Microsemi Corp - Massachusetts. Government technical data includes 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5961-01-507-4112 |
| Primary Part Number | MRF581A |
| Item Name | Transistor |
| FSC / FSG | 5961 / 59 — Semiconductor Devices and Associated Hardware |
| Manufacturer | Microsemi Corp - Massachusetts |
| Status | ACTIVE |
| Voltage Rating in Volts Per Characteristic | 15.0 MAXIMUM COLLECTOR TO EMITTER VOLTAGE/STATIC/BASE OPEN AND 30.0 MAXIMUM COLLECTOR TO BASE VOLTAGE/STATIC/EMITTER OPEN AND 2.5 MAXIMUM EMITTER TO BASE VOLTAGE, STATIC, COLLECTOR OPEN |
| Mounting Facility Quantity | 4 |
| Overall Diameter | 0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN |
| Mounting Method | TERMINAL |
| Semiconductor Material | SILICON |
| Current Rating Per Characteristic | 200.00 MILLIAMPERES MAXIMUM COLLECTOR CURRENT, DC |
| Material | PLASTIC ENCLOSURE |
| Terminal Type and Quantity | 4 KNIFE BLADE |
| Power Rating Per Characteristic | 2.5 WATTS MAXIMUM TOTAL DEVICE 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 |
|---|---|
| 1854-1225 | Keysight Technologies Inc (USA) |
| MRF581A PRIMARY | Microsemi Corp - Massachusetts (USA) |
| Reference | Meaning |
|---|---|
| 1854-1225 | 5/9 Secondary reference Keysight Technologies, Inc. |
| MRF581A | 3/9 Design control — primary reference Microsemi Corporation |
| 1854-1225 | 5/9 Secondary reference Hewlett-Packard Company Dba HP |
NSN 5961-01-507-4112 is a Transistor, manufactured by Microsemi Corp - Massachusetts, classified under FSC 5961, Semiconductor Devices and Associated Hardware. Status: active.
NSN 5961-01-507-4112 has 2 manufacturer part numbers on file: 1854-1225 (Keysight Technologies Inc), MRF581A (Microsemi Corp - Massachusetts).
Key specifications for MRF581A: Overall Height: 0.075 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN; Voltage Rating in Volts Per Characteristic: 15.0 MAXIMUM COLLECTOR TO EMITTER VOLTAGE/STATIC/BASE OPEN AND 30.0 MAXIMUM COLLECTOR TO BASE VOLTAGE/STATIC/EMITTER OPEN AND 2.5 MAXIMUM EMITTER TO BASE VOLTAGE, STATIC, COLLECTOR OPEN; Mounting Facility Quantity: 4; Overall Diameter: 0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN. 9 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.