Self-Powered AC Solid State Relay with MOSFETs Reference Design


Design files


The self-powered AC solid state relay with MOSFETs reference design is a single relay replacement that enables efficient power management for a low-power alternative to standard electromechanical relays in thermostat applications. This SSR reference design is self-powered through the 24V AC power line, eliminating additional power consumption of thermostat battery. The MOSFETs can switch fast enough to allow self-charging without affecting the load.

  • No clicking sound
  • Cost efficient BOM
  • MOSFET-based design for fast on/off switching
  • Zero thermostat battery power consumption
  • Under-voltage and over-current protection
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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.

TIDUBR5.PDF (1468 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRNE7.ZIP (15480 K)

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


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

TIDRNE6.PDF (1381 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Shunt voltage references

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

Data sheet: PDF | HTML
AND gates

SN74AUP2G082-ch, 2-input 0.8-V to 3.6-V low power (< 1uA) AND gate

Data sheet: PDF | HTML

LP339Quad low-power commercial grade standard comparator

Data sheet: PDF
D-type flip-flops

SN74AUP1G74Low-Power Single Positive-Edge-Triggered D-Type Flip-Flop

Data sheet: PDF | HTML
Inverting buffers & drivers

SN74AUP1G14Single 0.8-V to 3.6-V low power inverter with Schmitt-Trigger inputs

Data sheet: PDF | HTML

CSD19537Q3100-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 14.5 mOhm

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74AUP1G17Single 0.8-V to 3.6-V low power buffer with Schmitt-Trigger inputs

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Self-Powered AC Solid State Relay With MOSFETs Design Guide Aug. 26, 2016
Application note Designing with the ATL431LI Nov. 27, 2018

Related design resources

Reference designs

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 TIDA-01065 Isolated Self-Powered AC Solid State Relay with MOSFETs Reference Design

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