Why do Opto-MOSFET Relays and Solid State Relays have leakage current? - FAQs | Bright Toward Industrial Co., LTD.

Due to the contactless design, it is impossible for Opto-MOSFET Relays and Solid State Relays to operate without current leakage. With reed relays and mechanical relays, two physical reed contacts are separated when the relay is turned off, making it impossible for signals to go through. However, when you turn off an Opto-MOSFET Relay or Solid State Relay, you cut off the LED's current or voltage driving the MOSFET, which leaves space for a tiny amount of current to pass through. Therefore, for customers in the test and measurement industry, where a clean cut-off of signal is required, we recommend Reed Relays over Opto-MOSFET Relays. However, we also offer a series of low leakage current Opto-MOSFET Relays, with leakage current down to 1nA (1 nanoAmp). Manufacturer of Opto-MOSFET Solid State Relays, Reed Relays, and RF MEMS Switches. We mainly serve the Semiconductor Testing, ATE, BMS (Battery Management Systems), industrial machinery and Electric Vehicle industries.

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Why do Opto-MOSFET Relays and Solid State Relays have leakage current?

Bright Toward Industrial Co., Ltd is a manufacturer of Solid State Relays, Reed Relays and MEMS Switches.

Why do Opto-MOSFET Relays and Solid State Relays have leakage current?

Due to the contactless design, it is impossible for Opto-MOSFET Relays and Solid State Relays to operate without current leakage. With reed relays and mechanical relays, two physical reed contacts are separated when the relay is turned off, making it impossible for signals to go through. However, when you turn off an Opto-MOSFET Relay or Solid State Relay, you cut off the LED's current or voltage driving the MOSFET, which leaves space for a tiny amount of current to pass through. Therefore, for customers in the test and measurement industry, where a clean cut-off of signal is required, we recommend Reed Relays over Opto-MOSFET Relays. However, we also offer a series of low leakage current Opto-MOSFET Relays, with leakage current down to 1nA (1 nanoAmp).

Below are our most popular Opto-MOSFET Relays with leakage current less than 1nA (1 nano amp)
  • 45-pA Series: 60V/200mA
  • 37-pA Series: 60V/550mA
  • 47-pA Series: 80V/1.5A
  • 30-pA Series: 400V/120mA
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60V/200mA Solid State Relay, Leakage Current< 1nA in all package types - 60V/ 200mA SSR RELAY SPST-NO (1 Form A, 2 Form A), Leakage Current<1nA
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80V/1.5A Solid State Relay, Leakage Current< 1nA in all package types - 80V/1.5A SPST-NO (1 Form A, 2 Form A), Leakage Current< 1nA
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AB47-pA, AA47-pA, AC47-pA, AB47F-pA, AA47F-pA, AC47F-pA, AB47S-pA, AC47S-pA,

Our high load current 1.5A, load voltage 80V, off-state leakage current < 1nA IC Solid State...

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400V/120mA Solid State Relay, Leakage Current< 1nA in all package types - 400V/120mA SSR RELAY SPST-NO (1 Form A, 2 Form A), Leakage Current<1nA
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B.T - A manufacturer of Solid State Relays, Reed Relays and MEMS Switches.

Located in Taiwan since 1988, Bright Toward Industrial Co., LTD. is a relay supplier and manufacturer. Main products, including Opto-MOSFET Relays, Opto-SiC MOSFET Relays, Solid State Relays, Reed Relays, And RF MEMS Switches, etc.

B.T supplies relays to the world's semiconductor and automotive industries for over three decades and has long term long-term partnerships with OKITA Works based in Japan; Menlo Microsystems based in California; JEL Systems based in Japan and Teledyne Relays and Coax Switches based in California. Mainly serve the Semiconductor Testing, ATE, BMS (Battery Management Systems), industrial machinery and Electric Vehicle industries.

B.T has been offering customers high-quality Opto-MOSFET and Opto-SiC MOSFET relays since 1988, both with advanced technology and 30 years of experience, B.T ensures each customer's demands are met.