Self-Powered AC Solid State Relay with MOSFETs Reference Design
View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
Key Document
Description
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.
Features
- 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
View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
Schematic/Block Diagram
Quickly understand overall system functionality.

Download Schematic
Design Guide
Get results faster with test and simulation data that's been verified.

Download Design Guide
Bill of Materials (BOM)
Find the complete list of components in this reference design.
Download BOM
TI Devices (7)
Order samples, get tools and find more information on the TI products in this reference design.
CAD/CAE symbols
Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
Step 1: Download and install the free download.
Step 2: Download the Symbol and Footprint from the CAD.bxl file table.
Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
Step 1: Download and install the free download.
Step 2: Download the Symbol and Footprint from the CAD.bxl file table.
Step 3: Open the .bxl file with the Ultra Librarian software.
You can always access the complete CAD/CAE Symbols database at http://webench.ti.com/cad/
Both PCB footprints and schematic symbols are available for download in a vendor neutral format, which can then be exported to the leading EDA CAD/CAE design tools using the Ultra Librarian Reader. The reader is available as a (free download.).
The UL Reader is a subset of the Ultra Librarian toolset that can generate, import, and export components and their attributes in virtually any EDA CAD/CAE format.
Technical Documents
View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
User guides (1)
Title | Abstract | Type | Size (KB) | Date |
| | PDF | 1468 |
26 Aug 2016
|
Design files (6)
| | ZIP | 642 |
26 Aug 2016
|
| | ZIP | 15480 |
26 Aug 2016
|
| | PDF | 1381 |
26 Aug 2016
|
| | PDF | 188 |
26 Aug 2016
|
| | PDF | 72 |
26 Aug 2016
|
| | PDF | 560 |
26 Aug 2016
|
Related Tools & Software
Support & training
Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.
Search answers from TI experts
Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.
If you have questions about quality, packaging, or ordering TI products visit our Support page.