The Oscillator,crystal Controlled, cataloged under National Stock Number 5955-00-628-8953, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Xsis Electronics Inc. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5955-00-628-8953 |
| Primary Part Number | X143-0021-4.0MHZ |
| Item Name | Oscillator,crystal Controlled |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Manufacturer | Xsis Electronics Inc |
| Status | ACTIVE |
| Circuit Construction Type | SOLID STATE |
| FSC Application Data | MISCELLANEOUS COMMUNICATION EQUIPMENT |
| Inclosure Type | HERMETICALLY SEALED |
| Frequency Per Channel | 4.0 MEGAHERTZ NOMINAL OUTPUT CHANNEL |
| Connection Type | WIRE LEAD TERMINALS BOTTOM |
| Connection Contact Type and Quantity | 4 WIRE LEAD TERMINALS EXTERNAL |
| Operating Control Method | AUTOMATIC |
| Basic Shape Style | RECTANGULAR OR SQUARE |
| Identification Designator | MC1000A1-4MHZ-00136 MHz |
| Average Life Measurement | NOT RATED |
| Operating Temp Range | +0.0 TO 70.0 CELSIUS DEGC |
| Installation Design | MODULE |
| External DC Operating Voltage in Volts | 5.0 NOMINAL SINGLE VOLTAGE |
| 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 |
|---|---|
| X143-0021-4.0MHZ | Xsis Electronics Inc (USA) |
| MC1000A1-4MHZ | Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled (USA) |
| Reference | Meaning |
|---|---|
| 10062395-101 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5955-00-628-8953 is a Oscillator,crystal Controlled, manufactured by Xsis Electronics Inc, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
NSN 5955-00-628-8953 has 2 manufacturer part numbers on file: X143-0021-4.0MHZ (Xsis Electronics Inc), MC1000A1-4MHZ (Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled).
Key specifications for X143-0021-4.0MHZ: Circuit Construction Type: SOLID STATE; Overall Height: 0.230 INCHES NOMINAL IN; FSC Application Data: MISCELLANEOUS COMMUNICATION EQUIPMENT; Inclosure Type: HERMETICALLY SEALED. 13 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.