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MP240D2 Datasheet(PDF) 15 Page - Opto Electronics Co,. LTD

Part # MP240D2
Description  Solid-State Relays
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Manufacturer  E-OEC [Opto Electronics Co,. LTD]
Direct Link  http://www.e-oec.com
Logo E-OEC - Opto Electronics Co,. LTD

MP240D2 Datasheet(HTML) 15 Page - Opto Electronics Co,. LTD

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Solid-State Relays
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2006–2014 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
PAGE
15
Applications: Tips
Heat Sink Calculation
Like all semiconductor devices, SSR current ratings must be based on maximum internal junction temperature. All Opto 22 SSRs
operate conservatively at maximum internal junction temperatures of 110 °C. Use the equation below to calculate the maximum
allowable heat sink thermal resistance for your application. It is good engineering practice to provide a margin for error instead of
running the application right at the limits. If your application is near the thermal limit, it can be helpful to add a fan to move air
across the heat sink.
IMPORTANT: Thermally conductive grease must be used between the relay base and the heat sink.
Sample Calculation 1
120-volt, 20-amp load; 50 °C ambient air temperature
Model: 120D25 SSR.
See the last two columns of the table on page 4 for thermal resistance and dissipation values for the 120D25. Also, see the note at
the bottom of the table.
Dissipation: 1.3 watts/amp
Thermal resistance: 1.2 °C/watt
Maximum junction temperature: 110 °C
The calculation would be as follows:
This calculation indicates that you
should select a heat sink with a thermal
resistance of less than 1.1 °C/watt.


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