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Technical Data Sheet
PartsTable / COMPONENT / 42-3-4-3
42-3-4-3 ✓ Verified by PartsTable
Lindy · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The TRANSFORMER,AUDIO FREQUENCY is a Lindy industrial component. Key specifications include body_width: 0.750 INCHES NOMINAL IN, body_height: 0.750 INCHES NOMINAL IN, body_length: 1.120 INCHES NOMINAL IN, inclosure_type: FULLY INCLOSED, mounting_method: THREADED STUD(S) SINGLE GROUP, frequency_rating: 400.0 HERTZ NOMINAL SINGLE COMPONENT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-241-9524, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
42-3-4-3
NSN: 5950-00-241-9524
FSC: 5950
CAGE: 73386 — FREED TRANSFORMER CO (USA)
SPECIFICATIONS
body_width0.750 INCHES NOMINAL IN
body_height0.750 INCHES NOMINAL IN
body_length1.120 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
mounting_methodTHREADED STUD(S) SINGLE GROUP
frequency_rating400.0 HERTZ NOMINAL SINGLE COMPONENT
nominal_thread_size0.138 INCHES SINGLE GROUP IN
transformer_functionLINE
winding_power_rating65.0 VOLTS-AMPERES SINGLE COMPONENT SINGLE PRIMARY
reliability_indicatorNOT ESTABLISHED
maximum_operating_temp130.0 CELSIUS DEGC
end_item_identificationGENERATOR SET
NSN5950-00-241-9524
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: Lindy TRANSFORMER,AUDIO FREQUENCY TITLE COMPONENT PN 42-3-4-3 MFR Lindy TRANSFORMER,AUDIO FREQ
KEY FEATURES
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO LENGTH: 0.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
•
WINDING OPERATING CURRENT: 20.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY
•
MAXIMUM TRANSFORMER POWER RATING: 500.0 MILLIWATTS SINGLE COMPONENT
•
WINDING SHIELDING METHOD: INTERNAL SHIELD GROUNDED TO INCLOSURE SINGLE COMPONENT
•
BODY WIDTH: 1.031 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO WIDTH: 0.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
•
TERMINAL TYPE AND QUANTITY: 7 PIN
•
WINDING FUNCTION AND QUANTITY: 1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT
TECHNICAL CHARACTERISTICS (FLIS)
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO LENGTH0.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
WINDING OPERATING CURRENT20.0 MILLIAMPERES DC MAXIMUM SINGLE COMPONENT SINGLE PRIMARY
MAXIMUM TRANSFORMER POWER RATING500.0 MILLIWATTS SINGLE COMPONENT
WINDING SHIELDING METHODINTERNAL SHIELD GROUNDED TO INCLOSURE SINGLE COMPONENT
BODY WIDTH1.031 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN MOUNTING FACILITIES PARALLEL TO WIDTH0.750 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN
TERMINAL TYPE AND QUANTITY7 PIN
WINDING FUNCTION AND QUANTITY1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT
RELIABILITY INDICATORNOT ESTABLISHED
IMPEDANCE RATING IN OHMS200.0 NOMINAL SINGLE COMPONENT FIRST SECONDARY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
D351Interchangeable
interchangeable cross-reference
interchangeable
A845-1Interchangeable
interchangeable cross-reference
interchangeable
678-0321-00Interchangeable
interchangeable cross-reference
interchangeable
42-3-4-3Interchangeable
interchangeable cross-reference
interchangeable
31 105-001Interchangeable
interchangeable cross-reference
interchangeable
336-070-071Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 42-3-4-3?
42-3-4-3 is a TRANSFORMER,AUDIO FREQUENCY manufactured by Lindy.
What parts can replace 42-3-4-3?
There are 9 known substitutes for 42-3-4-3: D351, A845-1, 678-0321-00 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 42-3-4-3?
42-3-4-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5950-00-241-9524. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026