Kearfott · Electronic Components
128A
Transformer, Power
Part Number128A
ManufacturerKearfott
AvailabilityAvailable to order — request a quote
Specifications
NSN5950-00-947-9431 (NSN)
Federal Item NameTRANSFORMER,POWER
Federal Supply Class5950 — Coils and Transformers
Distance Between Mounting Facility2.375 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP
Input Output Phase RelationshipSINGLE PHASE TO SINGLE PHASE SINGLE COMPONENT
Winding Operating Voltage33.00 AC VOLTS NOMINAL SINGLE COMPONENT SECOND SECONDARY
Inclosure TypeFULLY INCLOSED
Frequency Rating400.0 HERTZ NOMINAL SINGLE COMPONENT
Winding Operating Current100.0 MILLIAMPERES AC NOMINAL SINGLE COMPONENT FIRST SECONDARY
Terminal Type And Quantity8 WIRE LEAD
Mounting Facility Quantity2 SINGLE GROUP
Overall Width1.938 INCHES MAXIMUM
Winding Function And Quantity1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT
Reliability IndicatorNOT ESTABLISHED
Vendor Part Numbers2545685, 6-781651-01
Impedance Rating Per Channel100.000 MEGOHMS OPERATING CHANNEL
External Ac Operating Voltage In V100.0 MINIMUM 2ND VOLTAGE AND 130.0 MAXIMUM 2ND VOLTAGE AND 200.0 MINIMUM 3RD VOLTAGE AND 260.0 MAXIMUM 3RD VOLTAGE
Pulse Duration Per Channel100.000 NANOSECONDS MINIMUM OPERATING CHANNEL
External Dc Operating Voltage In V20.0 MINIMUM 1ST VOLTAGE AND 30.0 MAXIMUM 1ST VOLTAGE
Pulse Peak Amplitude Per Channel100.000 MILLIVOLTS OPERATING CHANNEL
Indicator Device Type And Quantity1 LIGHT AND 1 METER
Operating Ac Frequency In Hertz50.0 MINIMUM 2ND VOLTAGE AND 60.0 MAXIMUM 2ND VOLTAGE AND 50.0 MINIMUM 3RD VOLTAGE AND 60.0 MAXIMUM 3RD VOLTAGE
Operating Temp Range+15.0 TO 45.0 CELSIUS
Overall Length17.750 INCHES NOMINAL
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is 128A available?
We can source 128A even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is 128A by Kearfott obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 128A has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like 128A?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for 128A?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.