PPTC es el acrónimo de Polymeric Positive Temperature Coefficient o Polimero con Coeficiente de temperatura Positivo. Es un componente pasivo que tiene características que permiten su uso en circuitos de protección contra sobrecorriente. Estos componentes también se conocen como multifuse, polyswitch o polyfuse. Podemos decir con alguna aproximación que son similares a los PTC o termistores con coeficiente de temperatura positivo. También se conocen como fusibles reiniciables o reiniciables o reiniciables. en el sentido de que una vez que la sobrecorriente desaparece, regresan a su condición de funcionamiento normal.

   Los PPTC fueron patentados en 1939 por Gerald Pearson de Bell Labs. En la Figura 1 tenemos algunos tipos comunes encontrados en aplicaciones electrónicas.

 

Figura 1
Figura 1

 

En la figura 2 a continuación tenemos la curva característica típica de este componente.

 

Figura 2
Figura 2

 

   Los PPTC se conectan en serie con los circuitos que deben proteger, como se muestra en la figura 3.

 

Figura 3 - Protección de LED de alto brillo
Figura 3 - Protección de LED de alto brillo

 

   Las aplicaciones también incluyen circuitos de audio, fuentes de alimentación, aplicaciones aeroespaciales y en casos que deben seguir el estándar PC97 para aplicaciones herméticas.

 

 

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