PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

TIP121Transistor

Texas Instruments Incorporated · NSN 5961-01-037-8667 · FSC 5961 · No Item Name Available
Verified by PartsTable
NSN 5961-01-037-8667 — this item is cataloged by the U.S. Government under National Stock Number 5961-01-037-8667. Primary manufacturer part number: TIP121.
Features
  • Transistor — FSC 5961
  • Current Rating Per Characteristic: 200.00 MICROAMPERES MAXIMUM COLLECTOR CUTOFF CURRENT, DC, EMITTER OPEN
  • Internal Configuration: JUNCTION CONTACT
  • Voltage Rating in Volts Per Characteristic: 80.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 80.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN
  • Terminal Length: 1.000 INCHES MINIMUM IN
  • Terminal Type and Quantity: 3 UNINSULATED WIRE LEAD
  • Mounting Method: TERMINAL
  • Features Provided: HERMETICALLY SEALED CASE
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transistor, cataloged under National Stock Number 5961-01-037-8667, 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 Texas Instruments Incorporated. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 10 commercial cross-references from 9 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5961-01-037-8667
Primary Part NumberTIP121
Item NameTransistor
FSC / FSG5961 / 59 — No Item Name Available
ManufacturerTexas Instruments Incorporated
StatusACTIVE
Current Rating Per Characteristic200.00 MICROAMPERES MAXIMUM COLLECTOR CUTOFF CURRENT, DC, EMITTER OPEN
Internal ConfigurationJUNCTION CONTACT
Voltage Rating in Volts Per Characteristic80.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 80.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN
Terminal Length1.000 INCHES MINIMUM IN
Terminal Type and Quantity3 UNINSULATED WIRE LEAD
Mounting MethodTERMINAL
Features ProvidedHERMETICALLY SEALED CASE
Power Rating Per Characteristic2.0 WATTS MAXIMUM COLLECTOR POWER DISSIPATION
Semiconductor MaterialSILICON
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5133-00-189-9276 INTERCHANGEABLE
Drill,twist
5920-00-247-3818440025 INTERCHANGEABLE
Fuseholder,extractor Post
Littelfuse, Inc.
6685-00-432-7589 INTERCHANGEABLE
Gage,pressure,dial Indicating
6140-00-467-610624 11-4 INTERCHANGEABLE
Battery,storage
Enersys Limited
5330-00-480-213524484 INTERCHANGEABLE
Gasket
Koehring Cranes, Inc Dba Terex Cranes Div Waverly Operations
4520-01-024-4810411833-3 INTERCHANGEABLE
Heating Element,electrical,nonim
Vulcan-Hart Corp
5905-01-066-77170127-R330 INTERCHANGEABLE
Resistor,variable,nonwire Wound,
Datum Inc Bancomm-Timing Div
5133-01-095-7990 INTERCHANGEABLE
Drill,twist
5961-01-122-7608 INTERCHANGEABLE
Transistor
6110-01-146-970424114.11-1 INTERCHANGEABLE
Controller,motor
Ward Leonard Ct Llc
Cross-Reference Index
Part NumberManufacturer
3107-0102 Marconi Avionics Ltd (GBR)
3107-0102 Leonardo Uk Ltd (GBR)
3107-0102 Leonardo Mw Ltd (GBR)
TIP121 Freescale Semiconductor, Inc. (USA)
TIP121 PRIMARY Texas Instruments Incorporated (USA)
15-14508-00 Compaq Federal Llc (USA)
TIP121 On Semiconductor Corporation (USA)
1514508-00 Compaq Federal Llc (USA)
440025 Northern Telecom Systems Corp (USA)
24114 Kleinschmidt Inc (USA)
Related Parts
5133-00-189-9276INTERCHANGEABLE
DRILL,TWIST
5920-00-247-3818INTERCHANGEABLE
FUSEHOLDER,EXTRACTOR POST
440025
6685-00-432-7589INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
6140-00-467-6106INTERCHANGEABLE
BATTERY,STORAGE
24 11-4
5330-00-480-2135INTERCHANGEABLE
GASKET
24484
4520-01-024-4810INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
411833-3
5905-01-066-7717INTERCHANGEABLE
RESISTOR,VARIABLE,NONWIRE WOUND,
0127-R330
5133-01-095-7990INTERCHANGEABLE
DRILL,TWIST
5961-01-122-7608INTERCHANGEABLE
TRANSISTOR
6110-01-146-9704INTERCHANGEABLE
CONTROLLER,MOTOR
24114.11-1
6515-01-164-8819INTERCHANGEABLE
BONE PLATE
241.14
4510-01-280-4391INTERCHANGEABLE
FAUCET,DOUBLE
B0201

Frequently Asked Questions

What is NSN 5961-01-037-8667?

NSN 5961-01-037-8667 is a Transistor, manufactured by Texas Instruments Incorporated, classified under FSC 5961 (No Item Name Available). Status: active.

What are the part numbers for NSN 5961-01-037-8667?

NSN 5961-01-037-8667 has 10 cross-referenced part numbers: 3107-0102 (Marconi Avionics Ltd), 3107-0102 (Leonardo Uk Ltd), 3107-0102 (Leonardo Mw Ltd), TIP121 (Freescale Semiconductor, Inc.), TIP121 (Texas Instruments Incorporated) and 5 more.

What NSN replaces 5961-01-037-8667?

There are 12 known substitutes for 5961-01-037-8667: 5133-00-189-9276, 5920-00-247-3818, 6685-00-432-7589 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of TIP121?

Key specifications for TIP121: Current Rating Per Characteristic: 200.00 MICROAMPERES MAXIMUM COLLECTOR CUTOFF CURRENT, DC, EMITTER OPEN; Internal Configuration: JUNCTION CONTACT; Voltage Rating in Volts Per Characteristic: 80.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-BASE, EMITTER OPEN AND 80.0 MAXIMUM BREAKDOWN VOLTAGE, COLLECTOR-TO-EMITTER, BASE OPEN; Terminal Length: 1.000 INCHES MINIMUM IN. 13 total characteristics are documented in the Federal Logistics Information System.

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