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Technical Data Sheet
PartsTable / MRO / 501A
501A ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 SEMICONDUCTOR DEVICE,DIODE is a the manufacturer industrial 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 6625-01-032-0223, 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
MRO→ MRO_GENERAL→ 501A
NSN: 6625-01-032-0223
FSC: 6625
CAGE: 20944 — WILTRON CO (USA)
SPECIFICATIONS
general_characteristics_item_descriptionMICRO PROCESSOR-BASED BOILER CONTROL DEVICE; DESIGNED FOR GAS AND OIL-FIRED HOT WATER BOILERS; BUILT-IN LCD SCREEN; 8.5 IN. H, 6.5 IN. W, 5.0 IN. D, 220 VOLT AC, 60.0 HZ, 6 AMPS. IN
NSN6625-01-032-0223
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SEMICONDUCTOR DEVICE,DIODE TITLE COMPONENT PN 501A MFR SEMICONDUCTOR DEVICE,D
KEY FEATURES
•
CIRCUIT CURRENT FOR WHICH DESIGNED: AC
•
FUNCTIONAL DESCRIPTION: LOGARITHMIC LEVEL METER
TECHNICAL CHARACTERISTICS (FLIS)
CIRCUIT CURRENT FOR WHICH DESIGNEDAC
END ITEM IDENTIFICATIONAN/FSQ-81(V)
OVERALL HEIGHT5.250 INCHES NOMINAL IN
OVERALL WIDTH12.000 INCHES NOMINAL IN
FUNCTIONAL DESCRIPTIONLOGARITHMIC LEVEL METER
OVERALL LENGTH12.000 INCHES NOMINAL IN
CIRCUIT CURRENT FOR WHICH DESIGNEDAC
END ITEM IDENTIFICATIONAN/FSQ-81(V)
OVERALL HEIGHT5.250 INCHES NOMINAL IN
OVERALL WIDTH12.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
GH825BG1Upgraded Successor
successor cross-reference
successor
MIL-H-87111/6Upgraded Successor
successor cross-reference
successor
6133Upgraded Successor
successor cross-reference
successor
501Upgraded Successor
successor cross-reference
successor
M-1929AUpgraded Successor
successor cross-reference
successor
A-82379 PART 7Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 501A?
501A is a SEMICONDUCTOR DEVICE,DIODE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 501A?
There are 9 known substitutes for 501A: GH825BG1, MIL-H-87111/6, 6133 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 501A?
501A is cataloged in the Federal Logistics Information System (FLIS) under NSN 6625-01-032-0223. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026