Voltage Multipliers, Inc. (VMI) — MIL-PRF-19500 JAN, JANTX & JANTXV high-voltage rectifier diode sourcing
Voltage Multipliers Incorporated (VMI) is the specialist U.S. source on the DLA MIL-PRF-19500 Qualified Manufacturers List for high-voltage rectifier diodes. Family-owned since December 1980 and operating from a single vertically integrated 44,000+ sq ft plant in Visalia, California, VMI holds active QML-19500 status under CAGE Code 60211 and was most recently re-qualified against MIL-PRF-19500R Performance Specification sheet /575 in a Hex-Cut Notice of Qualification effective June 4, 2025.
- 1980Founded
- Visalia, CAHQ & Plant
- 60211CAGE Code
- JAN → JANSQuality Levels
- 2 – 20 kVHV Rectifiers
- Family-ownedOwnership
About Voltage Multipliers, Inc.
Voltage Multipliers Incorporated was founded in December 1980 in Visalia, California to design, manufacture, and market high-voltage semiconductor products. As the company's name suggests, VMI began life building high-voltage multipliers — the Cockcroft-Walton and custom multi-stage rectifier stacks used to generate the kilovolt-range DC bias needed by cathode-ray tubes, photomultipliers, X-ray sources, and specialty test equipment. Adding high-voltage diode manufacturing capability in-house was the pivotal step in the company's history: once VMI could produce its own hermetic HV rectifier diodes, it could vertically integrate the multiplier stacks, expand into custom high-voltage power supplies and rectifier assemblies, and qualify its diodes as standalone JAN devices under MIL-PRF-19500.
More than four decades later, VMI is still a privately held, family-owned company. Its 44,000 to 45,000 sq ft facility at 8711 W. Roosevelt Avenue in Visalia combines roughly 34,000 sq ft of manufacturing with 10,000 sq ft of engineering and office space. Uniquely for a JAN-qualified U.S. diode manufacturer at this scale, every step of production — from wafer doping, diffusion and metallization through PCB assembly, encapsulation and 100% electrical test — happens on-site in California. There is no offshore fab, no offshore back-end, and no distributed multi-plant footprint to reconcile. Employee count sits at approximately 220. Co-founder Ken Haag, long-serving Vice President of Sales & Marketing, led the commercial side of the business from 1980 until his passing in July 2022.
VMI's market position is deliberately narrow and deep. Rather than compete across the full breadth of the MIL-PRF-19500 catalog — small-signal switching diodes, zeners, low-voltage rectifiers, transistors, MOSFETs, TVS — the company focuses almost entirely on the high-voltage segment: hermetic silicon rectifier diodes rated from 2 kV up to 20 kV Vrwm, single- and three-phase HV rectifier assemblies to 45 kV per leg, HV multipliers, HV opto-couplers used to trigger HV switching stages, and complete custom high-voltage power supply assemblies. That focus is why VMI shows up on the DLA Qualified Manufacturers List — and why it shows up on Hybrid Electronics' sourcing desk whenever a defense, medical imaging, or spaceflight BOM calls for a JANTX or JANTXV high-voltage rectifier.
QPL / QML-19500 status
The Defense Logistics Agency (DLA) Land and Maritime real-time list of qualified sources for MIL-PRF-19500 currently shows Voltage Multipliers Incorporated as an active source with the following identifiers:
- Manufacturer: Voltage Multipliers Incorporated
- CAGE Code: 60211
- Plant address: 8711 West Roosevelt Avenue, Visalia, CA 93291-9458, USA — the plant address is the same as the manufacturer address (a single-site qualification)
On top of the QML line-level qualification, VMI holds a separate DSCC Manufacturer Certification against MIL-PRF-19500 and a formal Laboratory Suitability Status for MIL-PRF-19500 / MIL-STD-750 test work — that is, VMI is authorized by DLA (formerly DSCC) to perform its own qualification inspection, conformance inspection (CI), and screening test in its on-site test lab. Lab Suitability matters commercially: it means VMI does not have to ship devices to an outside test house to maintain its JAN qualification, which shortens lead times on JANTX and JANTXV screening runs materially. VMI's Quality Management System is also registered to ISO 9001:2015 under TUV America certificate number 951 04 2642.
The most recent public qualification action is the Hex-Cut Notice of Qualification with effective date June 04, 2025. Hex-Cut qualification of VMI product was granted based on successful testing to MIL-PRF-19500R and Performance Specification sheet /575 — the high-voltage rectifier diode family that anchors the company's JAN business.
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 |
On top of the individual part-type qualification (the older Qualified Products List, QPL), the DoD now operates a line-level certification model called the Qualified Manufacturers List (QML) — that is the framework VMI's Visalia plant is currently certified against. For JANS parts, MIL-PRF-19500 further defines eight Radiation Hardness Assurance (RHA) levels, encoded as a single character (M, D, P, L, R, F, G, or H) inserted into the part number after the JANS prefix, corresponding to Total Ionizing Dose (TID) guarantees ranging from 3 krad(Si) at "M" up to 1 Mrad(Si) at "H". Rectifier structures — VMI's core — are naturally hard against ionizing dose up to roughly 106 – 107 rad(Si) and neutron fluences on the order of 1014 n/cm2 by construction, which is why JANS-flow high-voltage diodes are commonly specified for spacecraft power without an explicit RHA suffix.
VMI's MIL-PRF-19500 product portfolio
VMI's hermetic discrete portfolio is narrow but very deep in the high-voltage segment. The following categories are all covered by the company's active QML-19500 qualifications at the Visalia, CA facility and are the families we most commonly source. In line with buyer intent, this page lists part families and MIL-PRF-19500 slash sheets rather than individual JAN part numbers — specific part-number availability, date codes, and lead times are confirmed on quote.
High-voltage silicon rectifier diodes
This is the anchor product on VMI's QPL-19500 line and the largest catalog category by part-number count. Devices are packaged in hermetic voidless-glass axial-lead bodies (DO-4, DO-5, DO-13, DO-41 and equivalent VMI proprietary bodies), plus formed-lead (FL) variants and surface-mount tabbed (US) variants for board-mount applications. The VMI HV rectifier catalog spans Vrwm ratings from 2 kV to 20 kV, forward current ratings from 25 mA to 3.5 A, and reverse recovery times from 30 ns up to 3000 ns. Qualification levels available on the JAN side of the line are JAN, JANTX and JANTXV, with JANS-level screening available on specific device types via Source Control Document (SCD) flows.
Fast- and superfast-recovery HV rectifiers
A significant subset of the VMI HV rectifier family is qualified for fast-switching applications — 70 ns typical reverse recovery time on the JANTX / JANTXV lines under MIL-PRF-19500/575. Fast-recovery HV rectifiers are the workhorses of modern switching HV power supplies for X-ray tubes, klystron and TWT modulators, radar transmitters, and high-voltage servo drives. VMI is publicly cited as producing "some of the world's fastest switching rectifiers" in this class.
High-voltage rectifier assemblies
VMI packages its HV rectifier diodes into complete single-phase and three-phase bridge rectifier assemblies, in standard packages rated to 45 kV per leg. These modules are commonly used as the AC-to-DC input stage for kilovolt-class laboratory power supplies, ion-implanter platens, and medical imaging HV tanks, where a single-source, encapsulated assembly is more practical than mounting individual HV diodes on a customer PCB.
High-voltage multipliers
VMI's original product line — the reason the company is named as it is. HV multipliers are multi-stage rectifier-plus-capacitor networks (typically Cockcroft-Walton or proprietary variants) that convert a moderate AC input into a much higher DC output without needing a step-up transformer of proportional size. The catalog includes both potted through-hole multipliers and surface-mount multipliers (Z25FG series and related), specified by input voltage, multiplication factor, output voltage, and load current.
High-voltage opto-couplers and opto-diodes
A distinctive VMI product category. HV opto-couplers use an internal LED-to-photodiode interface to trigger stacks of HV switching diodes or MOSFETs while maintaining kilovolt-level isolation between the control side and the high-side gate drive. In HV power-supply and pulsed-power applications this eliminates the transformer coupling that would otherwise be required and lets the designer implement clean, fast HV switching from a low-voltage logic input.
Custom high-voltage power supplies
The most integrated product on the VMI catalog: complete custom high-voltage power supply assemblies, engineered to a specific customer requirement (input rails, output voltage, ripple, regulation, current limit, protection features, form factor). VMI's vertical integration means the same plant produces the internal HV diodes, multipliers, and opto-couplers going into these supplies. These are catalog / semi-custom products rather than MIL-PRF-19500-qualified discrete devices, but they are frequently specified alongside the JAN-qualified diode line on the same BOM, so we source them together.
Packaging heritage
VMI qualifies its HV rectifier devices across a wide package inventory, including axial-lead hermetic glass (DO-4, DO-5, DO-13, DO-41 and proprietary bodies), formed-lead (FL) variants for stand-off assembly, surface-mount tabbed ("US" suffix) variants for board-mount HV designs, and encapsulated potted assemblies for HV rectifier bridges and multiplier stacks. Devices are ESDS-classified to MIL-PRF-19500 / MIL-STD-750 Method 1020 Class 3A (4,000 to 7,999 V) and QPL diodes are solder-dipped per the governing Source Control Document.
Where VMI JAN parts fly and where they live
Because VMI's catalog concentrates on multi-kilovolt hermetic rectifier diodes, its JAN-level parts show up wherever a defense, aerospace, medical, or scientific system needs a space-qualified or reliability-screened path to move kilovolts of DC bias. Typical VMI-populated applications include:
- Radar transmitter power supplies — klystron, magnetron and TWT high-voltage bias and pulse-forming networks on ground-, ship-, and airborne-radar platforms
- Medical imaging — X-ray tube high-voltage tanks, mammography systems, CT gantries, and interventional fluoroscopy
- Particle accelerators — klystron / TWT bias, ion-source acceleration, and beam-line HV instrumentation
- Spacecraft power distribution — satellite HV rails for traveling-wave-tube amplifiers, electric propulsion (Hall-effect and ion thrusters), and payload high-voltage buses
- Photomultiplier tube (PMT) bias supplies — scientific instruments and nuclear detection equipment
- Semiconductor process equipment — ion implanters, e-beam lithography, plasma-processing HV supplies
- Electrostatic precipitators, HV pulse generators, and HV test equipment
On the spaceflight side, high-voltage rectifier structures are naturally hard against Total Ionizing Dose effects up to roughly 106–107 rad(Si) and neutron fluences on the order of 1014 n/cm2, which is why VMI HV diodes are routinely designed into satellite bus and payload power distribution without a separately called-out RHA level.
How Hybrid Electronics sources VMI 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 Voltage Multipliers, Inc. What we do is help defense, aerospace, medical, and industrial buyers close JAN-level HV rectifier BOMs when the mainstream authorized channel cannot support the exact date code, package variant, or obsolete lot they need.
Obsolete and legacy JAN HV diode inventory
Discontinued VMI part numbers, older date codes, and pre-current-revision slash-sheet variants no longer in active Visalia production. We source excess inventory from OEMs, CMs, and long-term storage stocks and can typically provide date-coded traceability.
Allocated current-production JAN parts
JAN, JANTX and JANTXV VMI high-voltage rectifier diodes and assemblies that are actively produced in Visalia but on long lead time or allocation. Send us a shortage list or a full BOM — we will confirm what we can source, in which package, and at what lead time.
Slash-sheet and cross-reference sourcing
Have a MIL-PRF-19500 slash-sheet reference (e.g. /575, /576, /577) but not a settled manufacturer part number? We can quote VMI options by voltage / current / recovery-time envelope and, where useful, cross-reference to equivalent qualified sources.
Frequently asked questions
Is Voltage Multipliers Inc. still on the MIL-PRF-19500 QPL?
Yes. Voltage Multipliers Incorporated is an active source on the DLA Land and Maritime real-time QML-19500 list under CAGE Code 60211, with its qualified plant at 8711 W. Roosevelt Ave., Visalia, CA. VMI's most recent Hex-Cut Notice of Qualification against MIL-PRF-19500R and slash sheet /575 was granted effective June 4, 2025.
What JAN quality levels does VMI hold on MIL-PRF-19500?
VMI's high-voltage rectifier diodes are catalog-qualified at the JAN, JANTX and JANTXV product-assurance levels, with JANS-level screening available on selected device types via Source Control Document flows. VMI is also DSCC-certified as a Laboratory Suitable manufacturer to perform qualification inspection, conformance inspection, and screening test to MIL-PRF-19500 and MIL-STD-750 in-house.
Which MIL-PRF-19500 slash sheets is VMI qualified against?
VMI is publicly documented as qualified against the high-voltage rectifier slash sheets MIL-PRF-19500/575, /576, and /577, which cover 2 kV to 10 kV axial-leaded, formed-lead, and surface-mount hermetic glass diodes. The 2025 Hex-Cut Notice of Qualification specifically renewed VMI's /575 status.
What is unique about VMI on the QPL-19500 list?
VMI is the specialist U.S. source on QPL-19500 for high-voltage (multi-kilovolt) rectifier diodes. Most other MIL-PRF-19500 manufacturers focus on medium-voltage rectifiers, zeners, small-signal diodes, and transistors; VMI owns the 2 kV to 20 kV JAN-qualified axial-diode niche, and produces all product on a single vertically integrated line in Visalia, California, from wafer through 100% test.
What VMI part families does Hybrid Electronics source?
Hybrid Electronics sources VMI high-voltage rectifier diode families across JAN, JANTX and JANTXV levels — standard-, fast-, and superfast-recovery variants in axial-leaded, formed-lead, and surface-mount hermetic packages — plus VMI's HV rectifier assemblies, voltage multipliers, HV opto-couplers, and custom high-voltage power supplies. We work by exact part number and by MIL-PRF-19500 slash-sheet reference and support both current-production and obsolete legacy inventory.
Is Hybrid Electronics an authorized VMI 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 Voltage Multipliers, Inc. 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 Voltage Multipliers, Inc. 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).