PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

X243-4.0MHZOscillator,crystal Controlled

Xsis Electronics Inc · NSN 5955-01-156-8873 · FSC 5955 · No Item Name Available
Verified by PartsTable
NSN 5955-01-156-8873 — this item is cataloged by the U.S. Government under National Stock Number 5955-01-156-8873. Primary manufacturer part number: X243-4.0MHZ.
Features
  • Oscillator,crystal Controlled — FSC 5955
  • Identification Designator: X243 AT 4.0MHZ-57051 MHz
  • Basic Shape Style: RECTANGULAR OR SQUARE
  • Overall Gain: 5.0 MILLIAMPERES
  • Installation Design: MODULE
  • Inclosure Type: HERMETICALLY SEALED
  • Shock Pulse Duration Time: 1.0 MILLISECONDS MS
  • Circuit Construction Type: SOLID STATE
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Oscillator,crystal Controlled, cataloged under National Stock Number 5955-01-156-8873, 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 Xsis Electronics Inc. Government technical data includes 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5955-01-156-8873
Primary Part NumberX243-4.0MHZ
Item NameOscillator,crystal Controlled
FSC / FSG5955 / 59 — No Item Name Available
ManufacturerXsis Electronics Inc
StatusCANCELLED
Identification DesignatorX243 AT 4.0MHZ-57051 MHz
Basic Shape StyleRECTANGULAR OR SQUARE
Overall Gain5.0 MILLIAMPERES
Installation DesignMODULE
Inclosure TypeHERMETICALLY SEALED
Shock Pulse Duration Time1.0 MILLISECONDS MS
Circuit Construction TypeSOLID STATE
Signal Voltage Rating Per Channel0.200 VOLTS NOMINAL INPUT
Connection Contact Type and Quantity14 PRINTED CIRCUIT EXTERNAL
External DC Operating Voltage in Volts5.0 MINIMUM SINGLE VOLTAGE AND 12.0 MAXIMUM SINGLE VOLTAGE
Connection TypePRINTED CIRCUIT BOTTOM
Overall Gain12.0 MILLIAMPERES
Frequency Per Channel4.0 MEGAHERTZ NOMINAL OUTPUT CHANNEL
Operating Temp Range-55.0 TO 125.0 CELSIUS DEGC
Shock Resistance Rating in Gravitational Units1000.0
Storage Temp Range-55.0 TO 125.0 CELSIUS DEGC
Vibration Resistance Range in Hertz+50.0 TO 2000.0
Average Life MeasurementNOT RATED
Vibration Resistance Amplitude50.0 GRAVITATIONAL UNITS
Environmental ProtectionSHOCK RESISTANT AND VIBRATION
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 2
5935-00-808-6134360-0164-000 INTERCHANGEABLE
Jack,tip
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
5340-01-682-169414899-1 INTERCHANGEABLE
Bracket,mounting
Gatr Technologies, Inc.
Cross-Reference Index
Part NumberManufacturer
X243-4.0MHZ PRIMARY Xsis Electronics Inc (USA)
X243/4.0MHZ Xsis Electronics Inc (USA)
148991-1 PRIMARY Xsis Electronics Inc (USA)
X243-40MHZ Xsis Electronics Inc (USA)
X243 AT 4.0MHZ Xsis Electronics Inc (USA)
148991 Cubic Defense Applications, Inc. (USA)
148991-1 Cubic Defense Applications, Inc. (USA)
Related Parts
5935-00-808-6134INTERCHANGEABLE
JACK,TIP
360-0164-000
5340-01-682-1694INTERCHANGEABLE
BRACKET,MOUNTING
14899-1

Frequently Asked Questions

What is NSN 5955-01-156-8873?

NSN 5955-01-156-8873 is a Oscillator,crystal Controlled, manufactured by Xsis Electronics Inc, classified under FSC 5955 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5955-01-156-8873?

NSN 5955-01-156-8873 has 7 cross-referenced part numbers: X243-4.0MHZ (Xsis Electronics Inc), X243/4.0MHZ (Xsis Electronics Inc), 148991-1 (Xsis Electronics Inc), X243-40MHZ (Xsis Electronics Inc), X243 AT 4.0MHZ (Xsis Electronics Inc) and 2 more.

What NSN replaces 5955-01-156-8873?

There are 2 known substitutes for 5955-01-156-8873: 5935-00-808-6134, 5340-01-682-1694. Verify interchangeability with system specifications before substitution.

What are the specifications of X243-4.0MHZ?

Key specifications for X243-4.0MHZ: Overall Length: 0.875 INCHES MAXIMUM IN; Identification Designator: X243 AT 4.0MHZ-57051 MHz; Basic Shape Style: RECTANGULAR OR SQUARE; Overall Gain: 5.0 MILLIAMPERES. 23 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5955-01-156-8873 still in active supply?

NSN 5955-01-156-8873 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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