Isolated 24VAC/DC Solid-State Relay Reference Design
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Key Document


This isolated, bi-directional, solid-state switch can control current flow into both AC and DC loads. Rated for 24VAC, it can switch loads up to approximately 1Arms/4Apeak.

  • 24VAC/DC solid state relay replaces mechanical relay
  • Board size is approximately 35mm x 12mm
  • Controls current flow into both AC and DC loads
  • Higher current rating possible by simply replacing FETs

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)1
Vin (Max) (V)28
Vout (Nom) (V)24
Iout (Max) (A)4
Output Power (W)96
Input TypeDC

TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD19538Q3A  100-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 61 mOhm  MOSFETs  Sample & Buy Not Available
UCC28086  Current mode push-pull PWM with prog. slope comp, 100µs soft start, 4.3/4.1 UVLO, -40°C to 85°C  Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD19538Q3A VSONP (DNH)| 8 Download
UCC28086 Download Download
Download Download
Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 720 31 Oct 2016
Design files (6)
Title Type Size (KB) Date
ZIP 273 31 Oct 2016
ZIP 11382 31 Oct 2016
PDF 212 31 Oct 2016
PDF 45 31 Oct 2016
PDF 89 31 Oct 2016
PDF 83 31 Oct 2016

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