PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2N3666Transistor

Gilbert Engineering Co Inc/incon Sub of Transitron Electronic Corp · NSN 5961-00-005-8918 · FSC 5961 · No Item Name Available
Verified by PartsTable
NSN 5961-00-005-8918 — this item is cataloged by the U.S. Government under National Stock Number 5961-00-005-8918. Primary manufacturer part number: 2N3666.
Features
  • Transistor — FSC 5961
  • Features Provided: HERMETICALLY SEALED CASE
  • Mounting Method: TERMINAL
  • Internal Configuration: JUNCTION CONTACT
  • Current Rating Per Characteristic: 1.00 AMPERES MAXIMUM COLLECTOR CURRENT, DC
  • Overall Diameter: 0.370 INCHES NOMINAL IN
  • Power Rating Per Characteristic: 28.0 MILLIWATTS MAXIMUM COLLECTOR POWER DISSIPATION
  • Semiconductor Material: SILICON
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transistor, cataloged under National Stock Number 5961-00-005-8918, 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 Gilbert Engineering Co Inc/incon Sub of Transitron Electronic Corp. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5961-00-005-8918
Primary Part Number2N3666
Item NameTransistor
FSC / FSG5961 / 59 — No Item Name Available
ManufacturerGilbert Engineering Co Inc/incon Sub of Transitron Electronic Corp
StatusCANCELLED
Features ProvidedHERMETICALLY SEALED CASE
Mounting MethodTERMINAL
Internal ConfigurationJUNCTION CONTACT
Current Rating Per Characteristic1.00 AMPERES MAXIMUM COLLECTOR CURRENT, DC
Overall Diameter0.370 INCHES NOMINAL IN
Power Rating Per Characteristic28.0 MILLIWATTS MAXIMUM COLLECTOR POWER DISSIPATION
Semiconductor MaterialSILICON
Terminal Length1.500 INCHES MINIMUM IN
Terminal Circle Diameter0.200 INCHES MINIMUM IN
Terminal Type and Quantity3 UNINSULATED WIRE LEAD
Voltage Rating in Volts Per Characteristic120.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 80.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN AND 8.0 MAXIMUM BREAKDOWN VOLTAGE, EMITTER-TO-BASE, COLLECTOR OPEN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 6
5905-00-131-9729 INTERCHANGEABLE
Resistor,fixed,composition
9905-00-199-6593102302 INTERCHANGEABLE
Plate,identification
Air Logistics Corporation Dba Air Logistics Corp
5305-00-587-4245 INTERCHANGEABLE
Screw,lag
5960-01-007-2224 INTERCHANGEABLE
Electron Tube
4820-01-145-762910237-5 INTERCHANGEABLE
Valve,globe
Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok
6625-01-463-6892 INTERCHANGEABLE
Indicator,digital Display
Cross-Reference Index
Part NumberManufacturer
2N3666 Gilbert Engineering Co Inc/incon Sub of Transitron Electronic Corp (USA)
102-302 Ametek Inc Schutte and Koerting Div (USA)
2N3666 Electronic Industries Association
RELEASE 4967 Electronic Industries Association
2N3666 Fairchild Semiconductor Corp (USA)
Related Parts
5905-00-131-9729INTERCHANGEABLE
RESISTOR,FIXED,COMPOSITION
9905-00-199-6593INTERCHANGEABLE
PLATE,IDENTIFICATION
102302
5305-00-587-4245INTERCHANGEABLE
SCREW,LAG
5960-01-007-2224INTERCHANGEABLE
ELECTRON TUBE
4820-01-145-7629INTERCHANGEABLE
VALVE,GLOBE
10237-5
6625-01-463-6892INTERCHANGEABLE
INDICATOR,DIGITAL DISPLAY

Frequently Asked Questions

What is NSN 5961-00-005-8918?

NSN 5961-00-005-8918 is a Transistor, manufactured by Gilbert Engineering Co Inc/incon Sub of Transitron Electronic Corp, classified under FSC 5961 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5961-00-005-8918?

NSN 5961-00-005-8918 has 5 cross-referenced part numbers: 2N3666 (Gilbert Engineering Co Inc/incon Sub of Transitron Electronic Corp), 102-302 (Ametek Inc Schutte and Koerting Div), 2N3666 (Electronic Industries Association), RELEASE 4967 (Electronic Industries Association), 2N3666 (Fairchild Semiconductor Corp).

What NSN replaces 5961-00-005-8918?

There are 6 known substitutes for 5961-00-005-8918: 5905-00-131-9729, 9905-00-199-6593, 5305-00-587-4245 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 2N3666?

Key specifications for 2N3666: Features Provided: HERMETICALLY SEALED CASE; Mounting Method: TERMINAL; Internal Configuration: JUNCTION CONTACT; Current Rating Per Characteristic: 1.00 AMPERES MAXIMUM COLLECTOR CURRENT, DC. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5961-00-005-8918 still in active supply?

NSN 5961-00-005-8918 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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