PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1855-0378Transistor

Keysight Technologies, Inc. · NSN 5961-00-421-3040 · FSC 5961 · No Item Name Available
Verified by PartsTable
NSN 5961-00-421-3040 — this item is cataloged by the U.S. Government under National Stock Number 5961-00-421-3040. Primary manufacturer part number: 1855-0378.
Features
  • Transistor — FSC 5961
  • Maximum Operating Temp Per Measurement Point: 200.0 CELSIUS JUNCTION DEGC
  • Terminal Type and Quantity: 3 UNINSULATED WIRE LEAD
  • Criticality Code Justification: FEAT
  • Electrode Internally-Electrically Connected to Case: GATE
  • Voltage Rating in Volts Per Characteristic: 40.0 MAXIMUM DRAIN TO GATE VOLTAGE AND 40.0 MAXIMUM DRAIN TO SOURCE VOLTAGE AND -40.0 MAXIMUM GATE TO SOURCE VOLTAGE
  • Internal Configuration: FIELD EFFECT
  • Mounting Method: TERMINAL
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Transistor, cataloged under National Stock Number 5961-00-421-3040, 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 Keysight Technologies, Inc.. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 27 commercial cross-references from 19 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
NSN5961-00-421-3040
Primary Part Number1855-0378
Item NameTransistor
FSC / FSG5961 / 59 — No Item Name Available
ManufacturerKeysight Technologies, Inc.
StatusCANCELLED
Maximum Operating Temp Per Measurement Point200.0 CELSIUS JUNCTION DEGC
Terminal Type and Quantity3 UNINSULATED WIRE LEAD
Criticality Code JustificationFEAT
Electrode Internally-Electrically Connected to CaseGATE
Voltage Rating in Volts Per Characteristic40.0 MAXIMUM DRAIN TO GATE VOLTAGE AND 40.0 MAXIMUM DRAIN TO SOURCE VOLTAGE AND -40.0 MAXIMUM GATE TO SOURCE VOLTAGE
Internal ConfigurationFIELD EFFECT
Mounting MethodTERMINAL
Terminal Circle Diameter0.100 INCHES NOMINAL IN
Terminal Length0.500 INCHES MINIMUM IN
Test Data Document81349-MIL-PRF-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.).
Overall Diameter0.209 INCHES MINIMUM AND 0.230 INCHES MAXIMUM IN
Current Rating Per Characteristic50.00 MILLIAMPERES MAXIMUM GATE CURRENT
Specification/standard Data81349-MIL-PRF-19500/385 GOVERNMENT SPECIFICATION
Power Rating Per Characteristic1.8 WATTS MAXIMUM TOTAL POWER DISSIPATION
Semiconductor MaterialSILICON
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5961-00-078-6860 INTERCHANGEABLE
Transistor
5310-00-084-002757632200-07 INTERCHANGEABLE
Washer,shouldered
Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier
5961-00-097-7487 INTERCHANGEABLE
Transistor
5961-00-104-1169531538-1 INTERCHANGEABLE
Transistor
Raytheon Company Dba Raytheon
5961-00-160-5542 INTERCHANGEABLE
Transistor
5961-00-227-5076 INTERCHANGEABLE
Transistor
5961-00-230-7559 INTERCHANGEABLE
Transistor
5961-00-243-9159 INTERCHANGEABLE
Transistor
5961-00-278-96322N4091 INTERCHANGEABLE
Transistor
Siliconix Incorporated Div Siliconix
5961-00-336-2033 INTERCHANGEABLE
Transistor
Cross-Reference Index
Part NumberManufacturer
1855-0378 Keysight Technologies, Inc. (USA)
10133078 Nimikkeistokeskus Ncb Finland (FIN)
SN2418 Siliconix Incorporated Div Siliconix (USA)
JANTX2N4856 Adelco Elektronik Gmbh (DEU)
FN2863 Siliconix Incorporated Div Siliconix (USA)
JANTX2N4856 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
JANTX2N4856A Adelco Elektronik Gmbh (DEU)
SF12452 National Semiconductor Corporation (USA)
2N4091 Solitron Devices, Inc. (USA)
JANTX2N4856 Joint Army-Navy Specifications Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
MIL-PRF-19500/385 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
200734-007 Bae Systems Information and Electronic Systems Integration Inc. Dba Bae Systems (USA)
723096-10 Raytheon Company Div Rmd Strategic (USA)
560717 Lockheed Martin Corporation Div Rms - Mitchel Field (USA)
2654518 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA)
1855-0378 Hewlett-Packard Company Dba HP (USA)
JAN2N4091 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
JAN2N4856 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
2N4856 Joint Army-Navy Specifications Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
6854W19P002 Ametek Inc Div Aerospace and Defense (USA)
Related Parts
5961-00-078-6860INTERCHANGEABLE
TRANSISTOR
5310-00-084-0027INTERCHANGEABLE
WASHER,SHOULDERED
57632200-07
5961-00-097-7487INTERCHANGEABLE
TRANSISTOR
5961-00-104-1169INTERCHANGEABLE
TRANSISTOR
531538-1
5961-00-160-5542INTERCHANGEABLE
TRANSISTOR
5961-00-227-5076INTERCHANGEABLE
TRANSISTOR
5961-00-230-7559INTERCHANGEABLE
TRANSISTOR
5961-00-243-9159INTERCHANGEABLE
TRANSISTOR
5961-00-278-9632INTERCHANGEABLE
TRANSISTOR
2N4091
5961-00-336-2033INTERCHANGEABLE
TRANSISTOR
5961-00-403-5368INTERCHANGEABLE
TRANSISTOR
5961-00-458-3568INTERCHANGEABLE
SEMICONDUCTOR DEVICE SET
329987

Frequently Asked Questions

What is NSN 5961-00-421-3040?

NSN 5961-00-421-3040 is a Transistor, manufactured by Keysight Technologies, Inc., classified under FSC 5961 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5961-00-421-3040?

NSN 5961-00-421-3040 has 27 cross-referenced part numbers: 1855-0378 (Keysight Technologies, Inc.), 10133078 (Nimikkeistokeskus Ncb Finland), SN2418 (Siliconix Incorporated Div Siliconix), JANTX2N4856 (Adelco Elektronik Gmbh), FN2863 (Siliconix Incorporated Div Siliconix) and 22 more.

What NSN replaces 5961-00-421-3040?

There are 12 known substitutes for 5961-00-421-3040: 5961-00-078-6860, 5310-00-084-0027, 5961-00-097-7487 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1855-0378?

Key specifications for 1855-0378: Maximum Operating Temp Per Measurement Point: 200.0 CELSIUS JUNCTION DEGC; End Item Identification: AIRCRAFT, ( AC-130H, MC-130H, EC-130E, HC-130 ); SUPPORT EQUIPMENT,; Terminal Type and Quantity: 3 UNINSULATED WIRE LEAD; Criticality Code Justification: FEAT. 18 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5961-00-421-3040 still in active supply?

NSN 5961-00-421-3040 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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