PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20639Oscillator,crystal Controlled

Sigma Tek, Inc. · NSN 5955-00-623-7271 · FSC 5955 · No Item Name Available
Verified by PartsTable
NSN 5955-00-623-7271 — this item is cataloged by the U.S. Government under National Stock Number 5955-00-623-7271. Primary manufacturer part number: 20639.
Features
  • Oscillator,crystal Controlled — FSC 5955
  • Control Type: LOCAL
  • Frequency Per Channel: 190.0 MEGAHERTZ NOMINAL OPERATING CHANNEL
  • Inclosure Type: ENCASED
  • FSC Application Data: RADIO NAVIGATION EQUIPMENT AIRBORNE
  • Operating Control Method: MANUAL
  • External DC Operating Voltage in Volts: 60.0 NOMINAL SINGLE VOLTAGE
  • Basic Shape Style: IRREGULAR
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Oscillator,crystal Controlled, cataloged under National Stock Number 5955-00-623-7271, is classified within Federal Supply Class 5955 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Sigma Tek, Inc.. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5955-00-623-7271
Primary Part Number20639
Item NameOscillator,crystal Controlled
FSC / FSG5955 / 59 — No Item Name Available
ManufacturerSigma Tek, Inc.
StatusACTIVE
Control TypeLOCAL
Frequency Per Channel190.0 MEGAHERTZ NOMINAL OPERATING CHANNEL
Inclosure TypeENCASED
FSC Application DataRADIO NAVIGATION EQUIPMENT AIRBORNE
Operating Control MethodMANUAL
External DC Operating Voltage in Volts60.0 NOMINAL SINGLE VOLTAGE
Basic Shape StyleIRREGULAR
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
6130-00-230-70966RS5GH26 INTERCHANGEABLE
Rectifier,metallic
Dean Technology Inc. Dba Cke
5133-00-266-9245 INTERCHANGEABLE
Drill,twist
4720-00-427-550820639 INTERCHANGEABLE
Hose,preformed
Gates Corporation
5330-00-684-594220639 INTERCHANGEABLE
Gasket
Avox Systems Inc Dba Avox Systems Inc
5365-00-868-687620639 INTERCHANGEABLE
Shim
Cadillac Gage Textron Inc.
5935-01-234-7138MS3452W22-5P INTERCHANGEABLE
Connector,receptacle,electrical
Sae International Dba Sae International
1650-01-436-109220639 INTERCHANGEABLE
Holder,linear Actuator Piston Fi
Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val
4730-01-516-4813C20639 INTERCHANGEABLE
Coupling,hose
Hydrasearch Company, Llc
Cross-Reference Index
Part NumberManufacturer
20639 Cessna Aircraft Co Arc Avionics Div (USA)
20639 PRIMARY Sigma Tek, Inc. (USA)
Related Parts
6130-00-230-7096INTERCHANGEABLE
RECTIFIER,METALLIC
6RS5GH26
5133-00-266-9245INTERCHANGEABLE
DRILL,TWIST
4720-00-427-5508INTERCHANGEABLE
HOSE,PREFORMED
20639
5330-00-684-5942INTERCHANGEABLE
GASKET
20639
5365-00-868-6876INTERCHANGEABLE
SHIM
20639
5935-01-234-7138INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
MS3452W22-5P
1650-01-436-1092INTERCHANGEABLE
HOLDER,LINEAR ACTUATOR PISTON FI
20639
4730-01-516-4813INTERCHANGEABLE
COUPLING,HOSE
C20639

Frequently Asked Questions

What is NSN 5955-00-623-7271?

NSN 5955-00-623-7271 is a Oscillator,crystal Controlled, manufactured by Sigma Tek, Inc., classified under FSC 5955 (No Item Name Available). Status: active.

What are the part numbers for NSN 5955-00-623-7271?

NSN 5955-00-623-7271 has 2 cross-referenced part numbers: 20639 (Cessna Aircraft Co Arc Avionics Div), 20639 (Sigma Tek, Inc.).

What NSN replaces 5955-00-623-7271?

There are 8 known substitutes for 5955-00-623-7271: 6130-00-230-7096, 5133-00-266-9245, 4720-00-427-5508 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20639?

Key specifications for 20639: Control Type: LOCAL; Frequency Per Channel: 190.0 MEGAHERTZ NOMINAL OPERATING CHANNEL; Overall Height: 0.719 INCHES NOMINAL IN; Inclosure Type: ENCASED. 10 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com