MIL-PRF-19500 manufacturer profile

General Semiconductor — historic JAN silicon rectifier & TVS brand, today produced under Vishay HiRel

General Semiconductor — the discrete-semiconductor brand rooted in the 1960 Semiconductor Components Division of General Instrument in Hicksville, New York — spent four decades as a first-rank U.S. supplier of hermetic JAN silicon rectifiers, fast and ultrafast rectifiers, Schottky diodes, and transient voltage suppressors (TVS). Spun off from General Instrument in 1997 and acquired by Vishay Intertechnology on November 2, 2001 in a transaction valued at approximately $540 million in stock plus about $229 million in assumed debt, its MIL-PRF-19500 portfolio operates today as Vishay General Semiconductor. Legacy "General Semi" JAN markings remain widely encountered in defense and aerospace supply chains.

  • 1960
    Founded
  • Melville, NY
    Historic HQ
  • Vishay
    Owner Since '01
  • ~$540M
    Deal Value
  • JAN → JANTXV
    Quality Levels
  • Rectifier / TVS
    JAN Specialty

About General Semiconductor and its Vishay successor

The name General Semiconductor in U.S. defense electronics traces to a single origin: the Semiconductor Components Division of General Instrument Corporation, founded in Hicksville, New York in 1960. General Instrument built the division into one of the largest independent silicon-rectifier manufacturers in the world during the 1960s through 1980s, producing the JEDEC-registered general-purpose 1 A DO-41 rectifier family and higher-current axial-lead series that remain in daily use across defense, avionics, industrial, and space power electronics.

In 1997, General Instrument spun off its discrete power-semiconductor business as an independent NYSE-listed company, General Semiconductor, Inc. (ticker SEM), headquartered in Melville, New York. The same year, the newly independent company acquired the small-signal diode business of ITT Industries, broadening its portfolio to cover switching diodes, Schottky rectifiers, and small-signal transistors alongside its core power rectifier and TVS lines. By 2000, General Semiconductor reported annual sales of approximately $493.7 million.

After an initially rejected April 2001 offer, Vishay Intertechnology and General Semiconductor announced a definitive agreement on August 1, 2001 and completed the deal on November 2, 2001, exchanging 0.563 Vishay shares per General Semiconductor share — valued at approximately $538.9 million in stock plus $229.4 million of assumed debt. On closing, Vishay publicly stated that the combination made it the number one manufacturer of diodes and rectifiers worldwide. The former General Semiconductor operations now trade as the Vishay General Semiconductor brand within Vishay's discrete high-reliability business.

A note on naming. A second, unrelated company — General Semiconductor Industries, Inc. ("GSI") of Tempe, Arizona (CAGE Code 24444) — operated in parallel through the 1980s as a JAN-level TVS specialist. NASA and IEEE 587 papers from 1984–1985 credit GSI-Tempe engineers W. D. Roehr and O. M. Clark with foundational ac line-surge suppression work. GSI-Tempe was owned by Square D Company and sold to ProTek Devices (Tempe, AZ) in 1992. Because both entities carried "General Semi" markings, both appear in legacy defense inventory; buyers holding rectifier or Schottky lots are almost always in the Melville / Hicksville — today Vishay — lineage.

QPL / QML-19500 status — from standalone listing to Vishay HiRel

Historic DLA QPL-19500 revisions from the 1980s and 1990s explicitly list General Semiconductor Ind., Inc. as a qualified source across multiple slash-sheet families — the name appears in publicly archived revisions including QPL-19500-55, -57, -70, -113, and -117. Product-assurance levels covered in those historic entries include JAN, JANTX, and JANTXV across silicon rectifiers and TVS families.

Following the November 2001 close of the Vishay acquisition, DLA administrative updates gradually migrated the standalone General Semiconductor entries into the Vishay Intertechnology successor entries on the QPL/QML-19500 roster. Date-coded parts stamped General Semi, GS, or the historic General Instrument diamond-G logo can still be encountered in long-term storage stocks, OEM excess, and CM overstock — genuine JAN-level product under the legacy qualifications, with current-production equivalents today built under Vishay's MIL-PRF-19500 line.

For sourcing purposes, this means General Semi JAN parts are today produced under Vishay's HiRel line. When a buyer requests a JAN-marked GSI part number, Hybrid Electronics identifies whether the requirement is best met by (a) a legacy General Semiconductor date code from excess inventory, (b) the current Vishay General Semiconductor production part, or (c) a cross-referenced QPL-19500 equivalent from another qualified manufacturer in our MIL-PRF-19500 manufacturer index.

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 Defense Logistics Agency (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 the JAN 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

The specification also defines eleven Radiation Hardness Assurance (RHA) levels that may be inserted into a JANTXV or JANS part number to indicate a guaranteed Total Ionizing Dose. Legacy General Semiconductor JAN rectifiers and TVS parts most commonly appear at the JAN, JANTX, and JANTXV levels. On top of the older per-part-type Qualified Products List (QPL), the DoD now operates a line-level Qualified Manufacturers List (QML) — the framework Vishay uses to hold the successor General Semiconductor qualifications today.

General Semiconductor's MIL-PRF-19500 product portfolio

The categories below describe the historic General Semiconductor JAN discrete portfolio and the successor part families now produced under Vishay's HiRel line. In line with buyer intent, this page lists part families and slash sheets rather than individual JAN part numbers — specific part-number availability, date codes, and package variants are confirmed on quote.

Standard-recovery silicon rectifier diodes

The foundation of the General Semiconductor / General Instrument diode business was the standard-recovery axial-lead silicon rectifier. The Hicksville, New York rectifier division produced the JEDEC-registered 1 A DO-41 general-purpose family and the higher-current 1.5 A and 3 A axial series that shipped by the millions into ground defense, avionics power supplies, and shipboard electronics. On MIL-PRF-19500 these devices appear across multiple slash-sheet numbers covering 1.0 A, 1.5 A, 3.0 A, 5.0 A, and higher-current axial rectifiers from 50 V through 1000 V at JAN, JANTX, and JANTXV quality levels.

Fast, ultrafast, and superfast recovery rectifiers

As switching-mode power converter designs pushed frequencies into the hundreds of kilohertz, General Semiconductor invested heavily in fast, ultrafast, and superfast recovery rectifiers with reverse recovery times in tens of nanoseconds. Hermetic voidless-glass DO-41-class packages for JAN-level applications sit alongside surface-mount MELF, DO-213AB, and axial options. The MIL-PRF-19500 slash sheets in this family cover fast, ultrafast, and superfast recovery categories through JANTXV and, on selected slash sheets, JANS.

Silicon Schottky rectifier diodes

Hermetic Schottky families qualified on MIL-PRF-19500 span 1 A, 2 A, 3 A, 5 A, and 10 A ratings in axial, MELF, and surface-mount packages, with product-assurance levels at JAN, JANTX, and JANTXV. Today the successor Vishay HiRel Schottky range continues to grow.

Silicon avalanche TVS (transient voltage suppressors)

TVS — the hermetic silicon avalanche transient voltage suppressor — is one of the defining product families of the General Semi name. The Melville line covered unidirectional and bidirectional TVS devices in 500 W, 1500 W, and 5000 W peak-pulse-power classes, in axial hermetic and surface-mount packages. On MIL-PRF-19500 the hermetic TVS families sit under slash sheet /516 and related series. In parallel, the separate GSI plant in Tempe, Arizona — today part of ProTek Devices — built a dedicated JAN-level TVS assembly business that also carried the General Semi name into defense supply chains.

Small-signal diodes, bridge assemblies, and other discretes

The 1997 acquisition of the ITT Industries small-signal diode business brought a range of small-signal switching and general-purpose diodes into the General Semiconductor lineup, qualified against MIL-PRF-19500 in glass DO-35 axial hermetic packages and surface-mount MELF equivalents at JAN, JANTX, and JANTXV levels. Hermetic single-phase and three-phase bridge rectifier assemblies, built up from qualified JAN rectifier die, round out the power-discrete portfolio, with slash sheets in the /469 range covering selected assemblies at JANTX and JANTXV. Small-signal bipolar transistors, MOSFETs, and analog ICs from the pre-2001 portfolio were later folded into Vishay's Siliconix and TransZorb brands.

Package heritage

General Semiconductor JAN parts most commonly appear in axial-lead hermetic glass packages — DO-35, DO-41, DO-15, DO-201AD, DO-4 stud — and in surface-mount MELF and gull-wing options for board-mounted power designs.

Ownership succession and legacy JAN date codes

Because the General Semiconductor name has passed through multiple corporate parents, buyers evaluating a JAN date code should trace the applicable lineage before quoting:

  • 1960–1997 — General Instrument Semiconductor Components Division, Hicksville, NY. Diamond-G markings.
  • 1997–2001 — General Semiconductor, Inc. (NYSE: SEM), Melville, NY. Includes the 1997 ITT small-signal addition. "General Semiconductor" wordmark or "GS" mark.
  • 2001–present — Vishay General Semiconductor, a brand of Vishay Intertechnology (NYSE: VSH). Current-production JAN parts carry Vishay markings.
  • 1970s–1992 (separate GSI-Tempe entity) — General Semiconductor Industries, Inc., Tempe, AZ. CAGE Code 24444. TVS-focused. Sold by Square D Company to ProTek Devices in 1992.

For a given RFQ, Hybrid Electronics traces the JAN part number back to its slash sheet, then confirms whether legacy stock is available, whether the current-production Vishay HiRel equivalent is appropriate, or whether a cross-referenced JAN source from another QPL-19500 manufacturer is preferable.

How Hybrid Electronics sources General Semiconductor 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 General Semiconductor, Vishay Intertechnology, or any successor entity. What we do is help defense, aerospace, and industrial buyers close JAN-level BOMs when the mainstream authorized channel cannot support the exact legacy date code, package variant, or obsolete General Semi lot they need.

Legacy General Semi JAN inventory

Discontinued Hicksville- and Melville-era part numbers, older date codes, and slash-sheet revisions no longer in current Vishay HiRel production. We source excess inventory from OEMs, CMs, and long-term storage stocks and can typically provide date-coded traceability.

Vishay HiRel current-production equivalents

General Semi JAN parts are today produced under Vishay's HiRel line. Where the current-production Vishay General Semiconductor part is the appropriate substitute for a legacy GSI request, we identify the successor part number, package, and lead time.

Slash-sheet and cross-reference sourcing

Have a MIL-PRF-19500 slash-sheet reference (for example the TVS /516 series or a rectifier slash sheet) but not a settled manufacturer part number? We can quote the historic General Semi and current Vishay HiRel options and, where useful, cross to equivalent QPL-19500 sources from other qualified manufacturers.

Frequently asked questions

Is General Semiconductor still on the MIL-PRF-19500 QPL?

Not under its own name. General Semiconductor, Inc. was acquired by Vishay Intertechnology on November 2, 2001, and the current-production JAN discrete parts are today qualified under Vishay's MIL-PRF-19500 line as Vishay General Semiconductor. Historic QPL-19500 revisions do explicitly list General Semiconductor Ind., Inc., and those legacy JAN-marked parts remain in circulation as excess and obsolete inventory.

Who owns General Semiconductor today?

Vishay Intertechnology, Inc. (NYSE: VSH), headquartered in Malvern, Pennsylvania. Vishay completed the acquisition on November 2, 2001, in a transaction valued at approximately $540 million in stock plus $229 million in assumed debt.

What JAN quality levels did General Semiconductor hold on MIL-PRF-19500?

General Semiconductor and its General Instrument predecessor held JAN, JANTX, and JANTXV qualifications across silicon rectifier, ultrafast rectifier, Schottky, and TVS families on multiple MIL-PRF-19500 slash sheets. Current-production successor parts under Vishay's HiRel line are qualified to JAN, JANTX, and JANTXV, with selected families at JANS space level.

What is the difference between General Semiconductor Inc. and General Semiconductor Industries (GSI Tempe)?

Two distinct companies shared the "General Semi" name in defense supply chains. General Semiconductor, Inc. (Melville / Hicksville, NY) traces to the 1960 General Instrument Semiconductor Components Division and was acquired by Vishay in 2001. General Semiconductor Industries, Inc. (GSI) (Tempe, AZ; CAGE 24444) was a TVS specialist owned by Square D; its Tempe operations were sold to ProTek Devices in 1992. Both appear in legacy JAN date-coded inventory.

Is Hybrid Electronics an authorized General Semiconductor or Vishay 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 General Semiconductor, Vishay Intertechnology, or any successor entity. 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 General Semiconductor, Vishay Intertechnology, Inc., ProTek Devices, or any successor or predecessor entity 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).