PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

AN/USM-108Generator,time Code

Joint Electronics Type Designation System · NSN 6645-00-628-6515 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-628-6515 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-628-6515. Primary manufacturer part number: AN/USM-108.
Features
  • Generator,time Code — FSC 6645
  • Signal Data Type Per Channel: 2ND OPERATING CHANNEL PULSE
  • Installation Design: TOP OF CABINET/COUNTER
  • Signal Data Type Per Channel: 1ST OPERATING CHANNEL TIME
  • Basic Shape Style: RECTANGULAR OR SQUARE
  • Connection Type: SINGLE PANEL JACK FRONT
  • External AC Operating Voltage in Volts: 117.0 NOMINAL 1ST VOLTAGE
  • Reference Data and Literature: TO 33A1-12-154-21
Applications
  • Applications requiring Plastic Enclosure construction
General Description

The Generator,time Code, cataloged under National Stock Number 6645-00-628-6515, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Joint Electronics Type Designation System. Government technical data includes 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6645-00-628-6515
Primary Part NumberAN/USM-108
Item NameGenerator,time Code
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerJoint Electronics Type Designation System
StatusCANCELLED
Signal Data Type Per Channel2ND OPERATING CHANNEL PULSE
Installation DesignTOP OF CABINET/COUNTER
Signal Data Type Per Channel1ST OPERATING CHANNEL TIME
Basic Shape StyleRECTANGULAR OR SQUARE
Connection TypeSINGLE PANEL JACK FRONT
External AC Operating Voltage in Volts117.0 NOMINAL 1ST VOLTAGE
Reference Data and LiteratureTO 33A1-12-154-21
Supplementary FeaturesMICROSECOND MARKERS AT INTERVALS 1, 5, 10, 50, 100, 500 MICROSECONDS; MILLISECOND MARKERS AT INTERVALS 1, 5, 10, 50, 100, 500 MILLISECONDS; ONE-SEC AND 5-SEC INTERVAL MARKERS; SINE WAVES 5, 10, & 50MHZ; TRIGGER PULSES AT 1HZ, 10HZ, 100HZ, 1KHZ, 10KHZ, 100KHZ MHz
Inclosure TypeENCASED
External AC Operating Voltage in Volts234.0 NOMINAL 2ND VOLTAGE
Signal Data Type Per Channel3RD OPERATING CHANNEL ANALOG VOLTAGE
Output Wave ShapePULSE, TRIGGER AND SINE
Average Life MeasurementNOT RATED
Operating AC Frequency in Hertz50.0 MINIMUM SINGLE VOLTAGE AND 60.0 MAXIMUM SINGLE VOLTAGE
MaterialPLASTIC ENCLOSURE
Circuit Construction TypeELECTRON TUBE
PhaseSINGLE
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 5
6625-00-135-6977 INTERCHANGEABLE
Oscilloscope Subassembly
5360-00-321-4278180A INTERCHANGEABLE
Spring,helical,extension
Matthew Warren, Inc. Dba Century Spring Corp. Div Century Spring Corp.
5360-00-326-5946 INTERCHANGEABLE
Spring,spiral,torsion
5975-00-359-6006180A INTERCHANGEABLE
Cover,junction Box
Egs Electrical Group Appleton Div
5962-01-307-2813180A INTERCHANGEABLE
Microcircuit,digital
Analog Devices, Inc. Div Corporate Headquarters
Cross-Reference Index
Part NumberManufacturer
180A Tektronix, Inc. (USA)
30441G1 L3harris Technologies, Inc. (USA)
AN/USM-108 PRIMARY Joint Electronics Type Designation System (USA)
Related Parts
6625-00-135-6977INTERCHANGEABLE
OSCILLOSCOPE SUBASSEMBLY
5360-00-321-4278INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
180A
5360-00-326-5946INTERCHANGEABLE
SPRING,SPIRAL,TORSION
5975-00-359-6006INTERCHANGEABLE
COVER,JUNCTION BOX
180A
5962-01-307-2813INTERCHANGEABLE
MICROCIRCUIT,DIGITAL
180A

Frequently Asked Questions

What is NSN 6645-00-628-6515?

NSN 6645-00-628-6515 is a Generator,time Code, manufactured by Joint Electronics Type Designation System, classified under FSC 6645 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6645-00-628-6515?

NSN 6645-00-628-6515 has 3 cross-referenced part numbers: 180A (Tektronix, Inc.), 30441G1 (L3harris Technologies, Inc.), AN/USM-108 (Joint Electronics Type Designation System).

What NSN replaces 6645-00-628-6515?

There are 5 known substitutes for 6645-00-628-6515: 6625-00-135-6977, 5360-00-321-4278, 5360-00-326-5946 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of AN/USM-108?

Key specifications for AN/USM-108: Signal Data Type Per Channel: 2ND OPERATING CHANNEL PULSE; Installation Design: TOP OF CABINET/COUNTER; Signal Data Type Per Channel: 1ST OPERATING CHANNEL TIME; Basic Shape Style: RECTANGULAR OR SQUARE. 20 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6645-00-628-6515 still in active supply?

NSN 6645-00-628-6515 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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