TIDA-00751

Solid State Relay 24V AC Switch with Galvanic Isolation Reference Design

TIDA-00751

Design files

Overview

The solid state relay 24V AC Switch reference design is a single relay replacement that enables efficient power management for a low power alternative to standard electromechanical relays.  The OFF-mode provides energy to the system controller and the ON mode can switch fast enough to allow backup battery charging where electromechanical relays cannot.  The internal transformer enables isolation and a voltage multiplier ensures enough current to control other relays in the rest of the system.

Features
  • Single electromechanical relay replacement
  • Low power solid state relay with silent operation
  • No clicking noise
  • <1µs Turn-on and Turn-off switching time
  • In OFF-mode, 24-VAC line provides energy to the system
  • <200µA consumption in OFF-mode
  • Cost efficient BOM

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.

TIDUB92B.PDF (1313 K)

Reference design overview and verified performance test data

TIDRJJ8.PDF (388 K)

Detailed schematic diagram for design layout and components

TIDRJJ9.PDF (108 K)

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

TIDRJK0.PDF (139 K)

Detailed overview of design layout for component placement

TIDRJK2.ZIP (791 K)

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

TIDCBM1.ZIP (600 K)

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

TIDRJK1.PDF (994 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

N-channel MOSFETs

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
D-type flip-flops

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
Digital demultiplexers & decoders

SN74LVC1G191-of-2 Decoder/Demultiplexer

Data sheet document-pdfAcrobat PDF open-in-new HTML
Inverting buffers & drivers

SN74AUP3G143-ch, 0.8-V to 3.6-V low power inverters with Schmitt-Trigger inputs

Data sheet document-pdfAcrobat PDF
Real-time clocks (RTCs) & timers

LMC555World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Solid-State Relay (SSR) 24-VAC Switch with Galvanic Isolation Design Guide (Rev. B) Mar. 08, 2016
Technical article How to power your thermostat using solid state relays Aug. 11, 2016
Technical article A modern approach to solid-state relay design Jul. 26, 2016
Technical article Click! Clack! What’s the setback in your thermostat? Jun. 28, 2016

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00377 Self-Powered AC Solid State Relay with MOSFETs 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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