PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ST9661Transistor

Fairchild Semiconductor Corp · NSN 5961-00-935-4963 · FSC 5961 · No Item Name Available
Verified by PartsTable
NSN 5961-00-935-4963 — this item is cataloged by the U.S. Government under National Stock Number 5961-00-935-4963. Primary manufacturer part number: ST9661.
Features
  • Transistor — FSC 5961
  • Terminal Circle Diameter: 0.200 INCHES NOMINAL IN
  • Test Data Document: 81349-MIL-S-19500 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.).
  • Current Rating Per Characteristic: 300.00 MILLIAMPERES MAXIMUM COLLECTOR CURRENT, DC
  • Semiconductor Material: SILICON
  • Power Rating Per Characteristic: 5.0 WATTS MAXIMUM TOTAL POWER DISSIPATION
  • Maximum Operating Temp Per Measurement Point: 200.0 CELSIUS AMBIENT AIR DEGC
  • Specification/standard Data: 81349-MIL-S-19500/366 GOVERNMENT SPECIFICATION
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transistor, cataloged under National Stock Number 5961-00-935-4963, is classified within Federal Supply Class 5961 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Fairchild Semiconductor Corp. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 16 commercial cross-references from 11 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5961-00-935-4963
Primary Part NumberST9661
Item NameTransistor
FSC / FSG5961 / 59 — No Item Name Available
ManufacturerFairchild Semiconductor Corp
StatusCANCELLED
Terminal Circle Diameter0.200 INCHES NOMINAL IN
Test Data Document81349-MIL-S-19500 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.).
Current Rating Per Characteristic300.00 MILLIAMPERES MAXIMUM COLLECTOR CURRENT, DC
Semiconductor MaterialSILICON
Power Rating Per Characteristic5.0 WATTS MAXIMUM TOTAL POWER DISSIPATION
Maximum Operating Temp Per Measurement Point200.0 CELSIUS AMBIENT AIR DEGC
Specification/standard Data81349-MIL-S-19500/366 GOVERNMENT SPECIFICATION
Overall Diameter0.335 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN
Function for Which DesignedAMPLIFIER
Electrode Internally-Electrically Connected to CaseCOLLECTOR
Terminal Length0.500 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
Terminal Type and Quantity3 UNINSULATED WIRE LEAD
Internal ConfigurationJUNCTION CONTACT
Mounting MethodTERMINAL
Voltage Rating in Volts Per Characteristic150.0 MAXIMUM COLLECTOR TO BASE VOLTAGE/STATIC/EMITTER OPEN AND 150.0 MAXIMUM COLLECTOR TO EMITTER VOLTAGE/STATIC/BASE OPEN AND 6.0 MAXIMUM EMITTER TO BASE VOLTAGE, STATIC, COLLECTOR OPEN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5961-00-011-7110 INTERCHANGEABLE
Transistor
5961-00-014-6458 INTERCHANGEABLE
Transistor
5961-00-113-7650 INTERCHANGEABLE
Transistor
5961-00-415-5994 INTERCHANGEABLE
Transistor
5961-00-456-4711 INTERCHANGEABLE
Transistor
5961-00-559-5738 INTERCHANGEABLE
Transistor
2530-00-753-9362230527 INTERCHANGEABLE
Crankshaft,compressor
Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems
5961-00-758-5815 INTERCHANGEABLE
Transistor
5961-00-836-3057910410 INTERCHANGEABLE
Transistor
Bae Systems Information and Electronic Systems Integration Inc.
5961-00-859-3121 INTERCHANGEABLE
Transistor
Cross-Reference Index
Part NumberManufacturer
ST9661 Fairchild Semiconductor Corp (USA)
JAN2N3500 Adelco Elektronik Gmbh (DEU)
JAN2N3500 Lacon Electronic Gmbh (DEU)
5961PL1279331 Jednolity Indeks Materialowy - Uniform Material Index (POL)
2N3500 National Semiconductor Corporation (USA)
MIL-PRF-19500/366 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-S-19500/366 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
436556 Raytheon Technical Services Company (USA)
JAN2N3500 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
JAN2N3500A Adelco Elektronik Gmbh (DEU)
442586 Raytheon Technical Services Company (USA)
44597 28103 Thales Deutschland Gmbh Div Customer Services (DEU)
418955-3 Raytheon Company Dba Raytheon (USA)
2N3500 Freescale Semiconductor, Inc. (USA)
436556-01 Raytheon Technical Services Company (USA)
352-7500-550 Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems (USA)
Related Parts
5961-00-011-7110INTERCHANGEABLE
TRANSISTOR
5961-00-014-6458INTERCHANGEABLE
TRANSISTOR
5961-00-113-7650INTERCHANGEABLE
TRANSISTOR
5961-00-415-5994INTERCHANGEABLE
TRANSISTOR
5961-00-456-4711INTERCHANGEABLE
TRANSISTOR
5961-00-559-5738INTERCHANGEABLE
TRANSISTOR
2530-00-753-9362INTERCHANGEABLE
CRANKSHAFT,COMPRESSOR
230527
5961-00-758-5815INTERCHANGEABLE
TRANSISTOR
5961-00-836-3057INTERCHANGEABLE
TRANSISTOR
910410
5961-00-859-3121INTERCHANGEABLE
TRANSISTOR
5961-01-026-2573INTERCHANGEABLE
TRANSISTOR
5961-01-193-5724INTERCHANGEABLE
TRANSISTOR

Frequently Asked Questions

What is NSN 5961-00-935-4963?

NSN 5961-00-935-4963 is a Transistor, manufactured by Fairchild Semiconductor Corp, classified under FSC 5961 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5961-00-935-4963?

NSN 5961-00-935-4963 has 16 cross-referenced part numbers: ST9661 (Fairchild Semiconductor Corp), JAN2N3500 (Adelco Elektronik Gmbh), JAN2N3500 (Lacon Electronic Gmbh), 5961PL1279331 (Jednolity Indeks Materialowy - Uniform Material Index), 2N3500 (National Semiconductor Corporation) and 11 more.

What NSN replaces 5961-00-935-4963?

There are 12 known substitutes for 5961-00-935-4963: 5961-00-011-7110, 5961-00-014-6458, 5961-00-113-7650 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of ST9661?

Key specifications for ST9661: Terminal Circle Diameter: 0.200 INCHES NOMINAL IN; Test Data Document: 81349-MIL-S-19500 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.).; Current Rating Per Characteristic: 300.00 MILLIAMPERES MAXIMUM COLLECTOR CURRENT, DC; Special Features: JUNCTION PATTERN ARRANGEMENT: NPN. 17 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5961-00-935-4963 still in active supply?

NSN 5961-00-935-4963 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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