FSC 5955 — Oscillators and Piezoelectric Crystals · FSG 59 — Electrical and Electronic Equipment Components
Government record, cited
Also searched as5955-00-577-7780 ·
5955005777780 ·
NIIN 005777780 ·
00-577-7780 ·
FSC 5955 Oscillators and Piezoelectric Crystals · MILC3098TYPECR51U · CR51U
Nearby stock numbers← 5955-00-577-7779
·
5955-00-577-7781 Crystal Unit, Quartz →
Features
Crystal Unit,quartz — FSC 5955
Frequency Tolerance for Operating Temp in Percent: -0.005 TO 0.005
Terminal Diameter: 0.050 INCHES NOMINAL IN
Terminal Length: 0.248 INCHES MAXIMUM IN
Mode of Oscillation: THIRD OVERTONE
Overall Thickness: 0.352 INCHES MAXIMUM IN
Style Designator: OVAL BODY, PIN TERMINALS
Body Length: 0.775 INCHES MAXIMUM IN
Identification
NSN: 5955-00-577-7780
NIIN: 005777780
FSC: 5955 — Oscillators and Piezoelectric Crystals
FSG: 59 — Electrical and Electronic Equipment Components
General Description
The Crystal Unit,quartz, cataloged under National Stock Number 5955-00-577-7780, is classified within Federal Supply Class 5955 (Oscillators and Piezoelectric Crystals) of the Electrical and Electronic Equipment Components group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5955-00-577-7780
Item Name
Crystal Unit,quartz
FSC / FSG
5955 / 59 — Oscillators and Piezoelectric Crystals
Status
ACTIVE
Frequency Tolerance for Operating Temp in Percent
-0.005 TO 0.005
Terminal Diameter
0.050 INCHES NOMINAL IN
Terminal Length
0.248 INCHES MAXIMUM IN
Mode of Oscillation
THIRD OVERTONE
Overall Thickness
0.352 INCHES MAXIMUM IN
Style Designator
OVAL BODY, PIN TERMINALS
Body Length
0.775 INCHES MAXIMUM IN
Center to Center Distance Between Terminals
0.486 INCHES NOMINAL IN
Operating Temp Range
-55.0 TO 90.0 CELSIUS DEGC
Specified Frequency
44.44925 KILOHERTZ
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items11
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5955-00-577-7781POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7782POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7783POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7784POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7786POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7788POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7789POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7791POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7792POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
5955-00-577-7794POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
MILC3098TYPECR51U
4/1Identification reference
U.S. Government activity
CR51U
3/1Design control — primary reference
U.S. Government activity
Related Parts
5955-00-577-7781POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7782POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7783POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7784POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7786POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7788POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7789POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7791POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7792POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-577-7794POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
5955-00-855-1645POSSIBLE MATCH
CRYSTAL UNIT,QUARTZ
Frequently Asked Questions
What is NSN 5955-00-577-7780?
NSN 5955-00-577-7780 is a Crystal Unit,quartz, classified under FSC 5955, Oscillators and Piezoelectric Crystals. Status: active.
What NSN replaces 5955-00-577-7780?
11 possible matches (shared part number, not a government interchangeability claim): 5955-00-577-7781, 5955-00-577-7782, 5955-00-577-7783. Verify interchangeability with system specifications before substitution.
What are the specifications of 5955-00-577-7780?
Key specifications for 5955-00-577-7780: Frequency Tolerance for Operating Temp in Percent: -0.005 TO 0.005; Terminal Diameter: 0.050 INCHES NOMINAL IN; Terminal Length: 0.248 INCHES MAXIMUM IN; Mode of Oscillation: THIRD OVERTONE. 10 specifications are documented in the U.S. Government catalog.
Is NSN 5955-00-577-7780 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.