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Photovoltaic-Output Photocoupler and MOSFET as Replacement for Mechanical Relay

HVAC application

HVAC application Click to enlarge
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Application circuit diagram

Application circuit diagram Click to enlarge
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  • Solid state relay circuit that phptovoltaic coupler drives power MOSFET directly.
  • Introduction of 5 A DC relay application example.
  • Design guidance of solid state relay as replacement of mechanical relay.


  • Solid state relay acheives "longer life", "higher reliability", and "more silence" compared with mechanical relay
  • Photovoltaic coupler : TLP3906

Reference design files

Design, Document

“Design・Document” contains the documents listed below.


Design guide

Toshiba items

Part Number Device Category Portion Usage Description
TLP3906 Photocaoupler Driving MOSFET・1 VOC=7V(Min)/ISC=12μA(Min)/BVS=3750V(Min)/Creepage distance=5.0mm(Min)/SO6
TPH1R306PL MOSFET Current flow line・1 U-MOSIX-H/60V/1.3mΩ(Max)@VGS=10V/SOP Advance


Application Note


Name Date
Selection Guide Photocoupler 2019(PDF:6.8MB) 01/2019



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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.