VMI - Makers of high voltage diodes, power supplies, multipliers, and rectifier assemblies.

You are here: VMI Home Page  >  XRS Power Supply, MD90FF32, Photo-diodes, SMF and SXF Diodes, Opto-couplers

VMI and CalRamic
High Voltage Specialists

VMI designs and manufactures high voltage diodes, multipliers, opto-couplers, and power supplies.

Calramic, our sister company, specializes in the manufacture high voltage ceramic capacitors, including 200C rated operating temp, single- and multi-layer, pulse discharge, and more.

Visit us at Electronica 2010, Booth A4.507.

OC100HG High Gain, High Stability, High Voltage Optocoupler
10kV Opto-coupler - High Voltage, High Gain, High Stability

VMI's 10kV OC100HG opto-coupler is specially designed for applications requiring stable long-term gain and high isolation voltage.

Electrical specs include -

• 10kVrwm

• 1W

The OC100HG is very useful in circuits that need to be isolated, remotely controlled, or monitored. The OC100HG is axial-leaded and epoxy molded.

VMI designs and manufactures high voltage diodes, multipliers, opto-couplers, and power supplies.



CalRamic High Voltage Ceramic Capacitors


The OZ100SG features high gain, and high isolation. Over molded in optically clear material, the junctions are light-sensitive. When a reverse voltage is applied, and the junctions are exposed to light, a small leakage current is generated. This leakage current can be used to control external systems when used as an opto-coupler.

The OZ100SG is small, ultra reliable, and packs high voltage in a very small package.

VMI's 10kV opto-diode was designed to be used in conjunction with LEDs, or other light sources, to expose silicon junctions to light.

It is not an opto-coupler, but can be used as one.

Exposing the junctions to light generates reverse leakage in the photo-diode. The reverse leakage current can be used as feedback, which in turn can be used to control or monitor external signals or systems.

Factors effecting gain of the photo-diode include

  • LED position and distance from the junctions
  • Type of LED used
  • Frequency of LEDs
  • Light intensity of LED
  • Percent exposure of the photo-diode junctions to light

Tape-and-reel available.

ASMS Booth #117.

More info on Opto-couplers...

Request a Catalog...or for more information contact Sales or Engineering.


For a complete product overview, visit our VMI Home Page.

CalRamic Technologies manufactures high voltage ceramic capacitors in voltage ranges up to 25kV. Package styles include multi-layer, single-layer, surface mount, leaded, bare, and more.

Several dielectrics are available, most notiably X5R, X7R, and NPO. CalRamic performs Group A & B screening, and life tests to Mil and Space levels.

Contact CalRamic Technologies for more information. Calramic, our sister company, specializes in the manufacture high voltage ceramic capacitors, including 200C rated operating temp, single- and multi-layer, pulse discharge, and more.



-50kV 10W X-ray Power Supply
Data Sheet - XRS Data Sheet

Meet the latest edition to VMI's family of high voltage portable X-ray power supplies. The XRS Series features

  • 7-12Vdc input voltage
  • -50kV 10W Output
  • Programmable current and voltage
  • Current and voltage monitoring
  • Low ripple voltage... More >>

Request a Catalog...or for more information contact Sales or Engineering.


OC100G High Voltage Opto-coupler
Data Sheet - OC100G

Meet the latest edition to VMI's family of 10kV opto-couplers. The OC100G features

  • 10.kV Vrwm
  • Stable long-term gain
  • High gain
  • High isolation voltage... More >>

Request a Catalog...or for more information contact Sales or Engineering.


MD90FF32 3.2kV J and gull wing leaded diode

Data Sheet  - MD90FF32 J-lead or MD90FF32 Gull Wing

Meet the latest edition to VMI's family of MD90s. The MD90FF32 is available in J-lead or gull-wing configurations, and in two different reverse recovery times. The MD90FF32 features

  • 3.2kV Vrwm
  • 250mA Io
  • 30nS or 70nS
  • Gull-wing or J-lead
Additional features include
  • 800V isolation in air
  • Small footprint
  • Surface Mount Package
  • Tape-and-reel available.

Request a Catalog...or for more information contact Sales or Engineering.



Last update: 11 Mar 2011