The Crystal Unit,quartz, cataloged under National Stock Number 5955-00-644-3673, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 5955-00-644-3673 |
| Item Name | Crystal Unit,quartz |
| FSC / FSG | 5955 / 59 — Oscillators and Piezoelectric Crystals |
| Status | ACTIVE |
| Distance Between Center Terminal and Outside Terminal Centers | 0.247 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN |
| Frequency Tolerance for Operating Temp in Percent | -0.010 TO 0.010 |
| Terminal Diameter | 0.153 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN |
| Second Center to Center Distance Between Terminals | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN |
| Terminal Length | 0.578 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN |
| Mode of Oscillation | FUNDAMENTAL |
| Equivalent Resistance Value in Ohms | 2000.0 MAXIMUM |
| Overall Thickness | 1.172 INCHES MINIMUM AND 1.202 INCHES MAXIMUM IN |
| Style Designator | RECTANGULAR BODY, PIN TERMINALS |
| Drive Level Rating | 1.6 MILLIWATTS MINIMUM AND 2.4 MILLIWATTS MAXIMUM |
| Specification/standard Data | 81349-MIL-C-3098/2 GOVERNMENT SPECIFICATION |
| Body Length | 1.986 INCHES MINIMUM AND 2.064 INCHES MAXIMUM IN |
| Center to Center Distance Between Terminals | 0.807 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN |
| Circuit Resonance | SERIES RESONANCE |
| Operating Temp Range | -40.0 TO 70.0 CELSIUS DEGC |
| Test Data Document | 81349-MIL-C-3098 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.). |
| Specified Frequency | 90.908 KILOHERTZ |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| MIL-C-3098/2 | 4/1 Identification reference U.S. Government activity |
| CR-16B/U90.908000KHZ | 2/2 Government specification standardization U.S. Government activity |
NSN 5955-00-644-3673 is a Crystal Unit,quartz, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 5955-00-668-1214, 5955-00-857-5085, 5955-00-857-5086. Verify interchangeability with system specifications before substitution.
Key specifications for 5955-00-644-3673: Distance Between Center Terminal and Outside Terminal Centers: 0.247 INCHES MINIMUM AND 0.253 INCHES MAXIMUM IN; Frequency Tolerance for Operating Temp in Percent: -0.010 TO 0.010; Terminal Diameter: 0.153 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN; Second Center to Center Distance Between Terminals: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN. 17 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.
NSN 5955-00-644-3673 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.