Semitronics Corp — MIL-PRF-19500 JAN, JANTX & JANTXV rectifier, SCR, thyristor and power-transistor sourcing
Semitronics Corporation is a privately held Long Island, New York manufacturer of hermetic discrete semiconductors, power thyristors, and hybrid microcircuits. Semitronics is DSCC-certified to Full Appendix D of MIL-PRF-19500 at the JAN, JANTX, and JANTXV quality levels, listed on the DLA Land and Maritime QML-19500 under CAGE Code 31338, and best known for hi-rel rectifier diodes, SCRs, triacs, alloy and silicon power transistors, and the rotating rectifier assemblies used inside military and civil aircraft engine generators.
- 1952Founded
- Freeport, NYHQ
- 31338CAGE Code
- JAN–JANTXVQuality Levels
- Appendix DDSCC Cert
- ActiveQML Status
About Semitronics Corporation
Semitronics Corp. was founded in 1952 as a supplier of electron tubes and, by the late 1950s, had grown into a distributor of the broader family of electronic components then coming into the U.S. defense and industrial market. In the mid-1970s the company expanded to Long Island, New York and pivoted from distribution to manufacturing, focusing on discrete commercial and industrial semiconductors. A decade later, in the early 1980s, Semitronics moved into the value-added military semiconductor market — the business that still defines the company today. Its corporate headquarters, hermetic assembly, hi-rel screening and test operations are located at 64 Commercial Street, Freeport, NY 11520, on the South Shore of Nassau County, with an additional wafer-fabrication partner in Taiwan operating under the Semitronics QML-19500 listing.
A large portion of Semitronics' hi-rel portfolio came into the company through a series of product-line acquisitions from General Electric, Westinghouse, and Powerex. These three names were among the historic U.S. power-thyristor and power-transistor houses of the 1960s and 1970s, and the technology they transferred forms the backbone of Semitronics' modern silicon-controlled rectifier (SCR), triac, and alloy bipolar-power-transistor lines — many of which continue to appear on active QPL-19500 slash sheets and on legacy Source Control Drawings still used by U.S. and European primes today. Semitronics operates Midwest and New England sales offices in Dayton, OH and Woburn, MA, but all MIL-PRF-19500 assembly, screening and JAN-flow test occur at the Freeport plant.
Semitronics parts have flown or fired on a wide range of U.S. and allied defense programs. Publicly cited programs include the AH-64 Apache helicopter, the TOW and Patriot missile systems, the F-16 Falcon and F/A-18 Super Hornet, the M-130 flare dispenser, the Gator cluster-munition system, the Eurofighter Typhoon, and the Mark-54 lightweight torpedo. The company's rotating-rectifier assemblies also appear inside the electrical generators of many military and civil aircraft engines — a niche where hermetic packaging and high operating temperature are non-negotiable.
QPL / QML-19500 status
The Defense Logistics Agency (DLA) Land and Maritime real-time list of qualified sources for MIL-PRF-19500 currently shows Semitronics under a single active entry:
- Semitronics Corporation — 64 Commercial Street, Freeport, NY 11520-2894, US — CAGE Code 31338
The DLA record also identifies a second plant under the same Semitronics qualification — Semitronics Corporation (2), Yenyo Technology Co Ltd, a partner wafer fab located at No. 189, Lung Chiuan Rd., Lungtan Tsuen, Taiwan. Wafer fabrication runs there under Semitronics' QML flow; die-attach, package seal, hermetic screening, JAN electrical test and outgoing quality-conformance inspection all occur at the Freeport plant in New York under Full Appendix D of MIL-PRF-19500 — the audit-and-self-qualify provision that lets a certified manufacturer add new part numbers to the QPL against slash-sheet requirements without repeat DLA site qualification for every device.
Semitronics markets its screening flows under three names — MIL, STX, and STXV — which map directly onto the DoD product-assurance levels JAN, JANTX, and JANTXV. Custom flows and Source Control Drawing (SCD) work are also supported. Semitronics does not publicly claim JANS space-level qualification, and Hybrid Electronics does not represent Semitronics parts as JANS unless a buyer has an explicit specification and traceable evidence to that level.
MIL-PRF-19500 quality levels — what JAN, JANTX, JANTXV, and JANS actually mean
MIL-PRF-19500 is the U.S. Department of Defense performance specification for hermetically-sealed discrete semiconductor devices — diodes, rectifiers, transistors, thyristors, SCRs, and TVS devices — administered by the DLA Land and Maritime office in Columbus, Ohio (the successor organization to DSCC-VQ). The specification defines a stack of ascending product-assurance levels, indicated by the prefix on a part number:
| Prefix | Level name | What it adds | Typical use case |
|---|---|---|---|
| JAN | Joint Army-Navy | Baseline qualification against slash sheet, Group A/B/C conformance | Ground defense, ruggedized industrial |
| JANTX | JAN with eXtra Testing | Adds 168-hour burn-in and additional 100% electrical screening | Airborne, avionics, missile |
| JANTXV | JANTX with Visual inspection | Adds 100% pre-cap internal visual inspection | Higher-reliability avionics, tactical space |
| JANS | Joint Army-Navy-Space | Adds wafer lot acceptance, Group E conformance and full space screening | Launch vehicles, satellites, deep space |
| JANHC / JANKC | Chip / die-level | Unencapsulated die screening for downstream hybrid assembly | MIL-PRF-38534 hybrids, custom modules |
Semitronics is qualified at the first three of these levels — JAN, JANTX, and JANTXV — under the certification framework known as Appendix D of MIL-PRF-19500. Appendix D is the section of the specification that describes the Product Assurance Program a manufacturer must have in place before DLA will grant it certification to self-qualify parts against slash sheets. A supplier that is Full Appendix D certified, as Semitronics is, has demonstrated compliance across design, wafer fab, assembly, screening, quality conformance, failure analysis, and configuration control — and can add new part types to the QPL against qualified slash-sheet requirements without a full per-device DLA re-qualification cycle. This is the same framework that anchors DLA's modern Qualified Manufacturers List (QML) approach for MIL-PRF-19500, which has largely displaced the older per-part-type Qualified Products List (QPL) model for new work.
The presence of a slash sheet — MIL-PRF-19500/nnn — indicates a specific device family (for example, a particular NPN power transistor, or a hermetic rectifier at a defined voltage/current class). A part is then designated by its JAN prefix, the base type number, and any suffix indicating package, screening, or radiation options. Semitronics' catalog material explicitly references slash sheets including MIL-PRF-19500/108, MIL-PRF-19500M/260, MIL-PRF-19500/168, and MIL-PRF-19500M/297, plus the DSSC-89116 solid-state relay series.
Semitronics' MIL-PRF-19500 product portfolio
Semitronics is unusual in that its portfolio leans heavily into power discretes and thyristors rather than the small-signal or purely diode-focused lines carried by some other QPL-19500 houses. The result is a catalog anchored on rugged, hermetic packages (DO-4, DO-5, TO-254 / TO-257 / TO-258, TO-3, and various stud and press-fit power packages) rather than the axial signal cases (DO-35, DO-41) that dominate elsewhere on the QPL. In line with buyer intent, this page lists device families rather than individual JAN part numbers — specific part-number availability, package, and lead time are confirmed on quote.
Rectifier diodes
Semitronics manufactures hermetic rectifier diodes across fast recovery, ultrafast, Schottky, and silicon-carbide (SiC) rectifier categories, in axial and stud packages up to the high-current classes used in bridge assemblies and generator systems. A signature Semitronics application is the rotating rectifier used inside aircraft engine electrical generators, offered in DO-4 and DO-5 press-fit stud packages at current ratings of roughly 40 to 90 A and reverse voltages to 1600 V. These parts are subjected to the extreme mechanical-stress and thermal-shock screening required by the rotating environment, and Semitronics builds them both as standard catalog product and against build-to-print Source Control Drawings.
Silicon Controlled Rectifiers (SCRs) and thyristors
SCRs and thyristors are one of Semitronics' deepest lines, inherited primarily from the General Electric, Westinghouse, and Powerex product-line acquisitions. The catalog splits broadly into phase-control SCRs for slow AC-line power switching and inverter-grade (fast-switching) SCRs for pulse and inverter applications, with high-reliability hermetic variants qualified through the JAN, JANTX, and JANTXV screening flows. Unijunction transistors and companion trigger devices also remain in the catalog to support legacy thyristor firing circuits still deployed on U.S. defense platforms.
Triacs
Hermetic triac families — used for bidirectional AC-line switching, phase control, and heater control on legacy military systems — remain in the Semitronics catalog under the SC240/241, SC245/246, SC250/251, SC260/261, and SC265/266 series, in JAN screening flows where slash-sheet qualification exists.
Zener voltage regulators and TVS
Semitronics manufactures zener voltage regulators in both 1%-tolerance and temperature-compensated (TCZ) versions, in low-power and high-power classes, and offers Transient Voltage Suppressor (TVS) devices in both hermetic axial and hermetic surface-mount packages, including cell SMD forms. Voltage regulator lines cover positive, negative, fixed, adjustable, and low-dropout variants.
Bipolar power transistors, MOSFETs, and IGBTs
The Semitronics power-transistor line is dominated by high-SOA NPN power BJTs in alloy and silicon construction, with widely-stocked families in the 151-, 153-, 154-, 163-, and 164-series device numbers, plus general-purpose hermetic NPN power devices carried over from the acquired GE / Westinghouse lines. In parallel, the company offers hermetic N-channel and P-channel power MOSFETs and IGBTs in TO-254, TO-257, and TO-258 hermetic power packages, together with hermetic ultrafast rectifiers, silicon-carbide rectifiers, Schottky rectifiers, and voltage regulators specifically qualified for use inside those same TO-254 family modules.
Solid-state relays and MOSFET drivers
Semitronics also manufactures MIL-qualified solid-state relays and photovoltaic MOSFET drivers, including devices qualified to the DSSC-89116 solid-state relay series drawing, plus custom hybrid SSR builds against customer SCDs.
3-phase bridge assemblies, discrete modules and hybrids
In addition to discrete devices, Semitronics builds discrete power modules and 3-phase bridge rectifier assemblies for motor drive and generator rectification, and holds test capability against MIL-PRF-38534 for hybrid microcircuits in analog, digital, microwave, and power domains. Semitronics packages standard semiconductors and custom ICs into a wide range of case styles, assembled to customer Source Control Drawings and screened using MIL flows.
High-temperature and specialty applications
Selected Semitronics devices carry storage and operating temperature ratings up to +250 °C, supporting applications such as down-hole (bore-hole) instrumentation and rotating rectifiers on aircraft engine electrical generators, where junction and case temperatures during operation exceed the ratings of standard commercial hermetic parts. Custom package solutions, value-added test services, custom repackaging of discrete and moderately-complex devices (including op-amps), and full failure analysis are also offered.
Signature niche: rotating rectifiers for aircraft generators
The single most distinctive Semitronics niche on MIL-PRF-19500 is the rotating-rectifier diode. In a modern brushless aircraft generator, three or six diodes are physically bonded to the rotor and spin at engine speed — typically thousands of rpm at hundreds of amps of DC output. The parts see continuous centrifugal loading, thermal cycling, and vibration that no static rectifier ever experiences, and are non-serviceable in flight. Failure of a rotating rectifier is a common cause of generator overhaul, and airworthiness authorities treat the parts as flight-critical hardware.
Semitronics has built rotating-rectifier diodes for both military and civil aviation for multiple decades, in DO-4 and DO-5 stud packages at 40 A, 60 A, and 90 A continuous forward current and reverse voltages to 1600 V. Rotating parts are offered both as catalog standards and as build-to-print Source Control Drawing product; assembly and screening techniques for the class have been refined at the Freeport plant across decades of production. This is a niche in which the number of qualified U.S. sources is small, and in which obsolete generator-overhaul demand periodically drives spot shortages at Hybrid Electronics' typical defense-aftermarket customers.
How Hybrid Electronics sources Semitronics JAN parts
Hybrid Electronics Corporation is a Sanford, Florida-based independent stocking distributor and sourcing agent, founded in 1981 as Knight Electronics. We are not an authorized distributor, agent, licensee, or franchised partner of Semitronics Corporation. What we do is help defense, aerospace, and industrial buyers close JAN-level bills of materials when the mainstream authorized channel cannot support the specific date code, package, or long-obsolete legacy part number they need — particularly on low-volume, aftermarket, and depot-overhaul workloads where the ordinary distribution model does not scale down cleanly.
Obsolete and legacy JAN inventory
Legacy Semitronics part numbers inherited from GE, Westinghouse, and Powerex product lines. Older date-coded rotating rectifiers, alloy power transistors, and phase-control SCRs no longer in current catalog production. We source excess from OEMs, contract manufacturers, and long-term storage stocks with date-coded traceability where possible.
Current JAN, JANTX, JANTXV production
Actively produced JAN, JANTX, and JANTXV parts under allocation or long lead time. Send us a shortage list or a full BOM and we will confirm what we can source, in which package, and at what lead time — usually within one business day.
Slash-sheet and rotating-rectifier sourcing
Have a MIL-PRF-19500 slash-sheet reference (e.g. /108, /168, /260, /297) but not a settled manufacturer part number? Need a DO-4 or DO-5 rotating rectifier for an aircraft-generator overhaul? Send us the drawing package or the SCD reference and we will quote Semitronics options and equivalent QPL-19500 sources from other qualified manufacturers where useful.
Not to be confused with Ohio Semitronics
Semitronics Corporation of Freeport, NY (the subject of this page, CAGE Code 31338) is a MIL-PRF-19500 hermetic discrete semiconductor manufacturer. It should not be confused with Ohio Semitronics, Inc., a separately-owned company headquartered at 4242 Reynolds Drive, Hilliard, OH 43026 that manufactures AC and DC current transducers, voltage transducers, watt/var transducers, and related electrical measurement instruments. Ohio Semitronics is not a MIL-PRF-19500 qualified source and is not related to Semitronics Corp of Long Island in ownership, product line, or defense-supplier status. Buyers occasionally cross the two brand names when working from historical documents; Hybrid Electronics quotes Semitronics Corp (Freeport, NY, CAGE 31338) parts only.
Frequently asked questions
Is Semitronics Corp still on the MIL-PRF-19500 QPL?
Yes. Semitronics Corporation is listed as an active source on the DLA Land and Maritime QML-19500 real-time list under CAGE Code 31338, at 64 Commercial Street, Freeport, NY 11520-2894. The DLA record identifies two plants under the same Semitronics qualification — the Freeport, NY assembly / screening / test facility and a partner wafer fab (Yenyo Technology Co Ltd) in Lungtan, Taiwan.
Which JAN quality levels does Semitronics hold?
Semitronics is DSCC-certified to Full Appendix D of MIL-PRF-19500 and markets JAN, JANTX, and JANTXV screening flows (which Semitronics also refers to internally as MIL, STX, and STXV). Semitronics does not publicly claim JANS space-level qualification on its own site or in its catalog.
What kinds of parts does Semitronics make?
Semitronics is a hermetic power-discrete and thyristor specialist. The portfolio spans rectifier diodes (fast, ultrafast, Schottky, SiC, and rotating for aircraft generators), SCRs and thyristors (phase-control and inverter-grade), triacs, high-SOA alloy and silicon bipolar power transistors, hermetic MOSFETs and IGBTs in TO-254 / TO-257 / TO-258, zener voltage regulators (1% and TCZ), TVS devices in hermetic axial and SMD, voltage regulators, and MOSFET-driven solid-state relays. Semitronics also builds MIL-PRF-38534 hybrid microcircuits and 3-phase bridge assemblies.
Which slash sheets is Semitronics qualified against?
Semitronics' own product material explicitly references MIL-PRF-19500 slash sheets /108, /168, /260, and /297, together with the DSSC-89116 solid-state relay series drawing. Additional slash-sheet coverage is confirmed on quote against the customer's specific part number or Source Control Drawing.
Is Semitronics Corp the same company as Ohio Semitronics?
No. Semitronics Corporation of Freeport, NY (CAGE 31338) is a MIL-PRF-19500 hermetic discrete semiconductor manufacturer. Ohio Semitronics, Inc. of Hilliard, OH is a separate company that makes AC and DC current, voltage, and power transducers and measurement instruments. The two share a similar name but are unrelated in ownership, product line, and mil-spec status.
Is Hybrid Electronics an authorized Semitronics distributor?
No. Hybrid Electronics is an independent stocking distributor and sourcing agent. We are not a distributor, reseller, agent, licensee, partner, or authorized service provider of Semitronics Corporation unless expressly stated. All trademarks are property of their respective owners.
Trademark and affiliation notice. All company names, product names, and trademarks referenced on this page are the property of their respective owners. Hybrid Electronics Corporation is an independent stocking distributor and sourcing agent; we are not a distributor, reseller, agent, licensee, partner, or authorized service provider of Semitronics Corporation unless expressly stated. Component sourcing is subject to availability and inspection. Hybrid Electronics does not sell counterfeit parts and does not offer repair services. MIL-PRF-19500 and JAN quality-level designations are administered by the U.S. Defense Logistics Agency (DLA).