SMD thermistors claimed smallest

24 March 2004 Circuit & System Protection Access Control & Identity Management

Murata claims its Posistors are the smallest in the world at 0603 size. For over-current prevention and overheat sensing, these positive-going thermistors offer a very rapid resistance increase when the temperature reaches the Curie point. Compared with common bimetal devices, Posistors cost less, are smaller, have no contact problems and are noise free. They require less circuit components than Zener diodes, occupy less space and reduce assembly costs.

The PRF18 over-temperature sensors have a nominal resistance value of 470 Ω, sensing temperatures in 10 degree steps from 85 to 145°C and operating temperature ranges from -20°C to comfortably above their sensing temperatures. Over-current protection is provided by the PRG18 and 21 families, 0603 and 0805 sized, operating currents are 25, 35, 55, 75, 85 110 mA and 140 mA. Both fuse resistors and current limiting chip resistors can be replaced with these devices.

Further reading:

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Varistors for automotive applications
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TDK Corporation has announced the addition of two new varistors to its AVRH series for automotive applications where both are characterised by the high electrostatic discharge-withstanding voltage demanded to ensure the safe operation of safety-critical automotive functions.

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ESD clothing plays a pivotal role in preventing that people do not charge the products that they are working with.

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Clearing the Static: ESD clothing and footwear
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Access & identity expectations for 2024
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What does 2024 have in store for the access and identity industry? SMART Security Solutions asked several industry players for their brief thoughts on what they expect this year.

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Access and identity in 2024
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SMART Security Solutions hosted a round table discussion with various players in the access and identity market, to find out what they experienced in the last year, as well as their expectations for 2024.

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The promise of mobile credentials
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SMART Security Solutions examines the advantages and disadvantages of mobile credentials in a market dominated by cards and fobs, in which biometrics is viewed as a secure alternative.

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Prepare for cyber-physical attacks
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As the security landscape continues to evolve, organisations must fortify their security solutions to embrace the changing needs of the security and technology industries. Nowhere is this more present than with regard to cybersecurity.

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Unleash the full potential of AI at the edge
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