Isolated Self-Powered AC Solid State Relay with MOSFETs Reference Design


Design files


The isolated self-powered AC solid state relay with MOSFETs reference design is a relay replacement that enables efficient power management for a low-power alternative to standard electromechanical relays. The galvanic isolation is implemented capacitively, creating a cost-efficient, reduced footprint solution for multiple relay replacement in thermostats and other similar equipment.

  • No clicking sound
  • Galvanic isolation
  • Self-powered
  • Zero power from thermostat battery
  • Inherent snubber circuit reducing voltage spike created by inductive loads
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUC91.PDF (1789 K)

Reference design overview and verified performance test data

TIDRQ94.PDF (435 K)

Detailed schematic diagram for design layout and components

TIDRQ95.PDF (68 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRQ96.PDF (153 K)

Detailed overview of design layout for component placement

TIDRQ98.ZIP (8078 K)

Files used for 3D models or 2D drawings of IC components

TIDCD96.ZIP (491 K)

Design file that contains information on physical board layer of design PCB

TIDRQ97.PDF (919 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AND gates

SN74LVC1G081-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate

Data sheet: PDF

LMV339Quad General Purpose Low-Voltage Comparators

Data sheet: PDF | HTML
D-type flip-flops

SN74LVC1G74Single Positive-Edge-Triggered D-Type Flip-Flop With Clear and Preset

Data sheet: PDF | HTML

CSD18541F560-V, N channel NexFET™ power MOSFET, single LGA 1.5 mm x 0.8mm, 65 mOhm, gate ESD protection

Data sheet: PDF | HTML
Shunt voltage references

ATL4312.5-V low-IQ adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Isolated Self-Powered AC Solid State Relay with MOSFETs Design Guide Jan. 27, 2017

Related design resources

Reference designs

TIDA-00377 Self-Powered AC Solid State Relay with MOSFETs Reference Design TIDA-00751 Solid State Relay 24V AC Switch with Galvanic Isolation Reference Design TIDA-01064 Low BOM Cost AC Solid State Relay with MOSFETs Reference Design

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