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Littelfuse Launches 250V Telecom PPTC Product Line

Littelfuse’s new 250V telecom PPTC product line, a 50% smaller dual PPTC package, saves board space by incorporating two telecom PPTCs into smaller surface mount package sizes.

Hongkong, October 28, 2019 – Littelfuse, Inc. (NASDAQ: LFUS), the world’s leading manufacturer of circuit protection, power control and sensing technology, today announced the launch of its new 250V Telecom PPTC product Series, this product line is designed to improve the reliability of telecom and networking equipment. The TSM250-130 series prevents current crossover and inductive surges as defined in ITU, Telcordia GR1089 and IEC 62368-1. Because the family incorporates two resistor-matched PPTCs into a surface-mount housing, the required board space can be reduced by 50%, simplifying installation and balancing the positive and negative line resistances.

The new product line is a Littelfuse PolySwitch® self-healing overcurrent protection device for telecom and networking equipment, suitable for:

  • Client device (CPE)
  • Central Office (CO) equipment
  • Subscriber Line Interface Card (SLIC)
  • Set-top box VoIP port

“Because the two resistor-matched PPTCs are housed in a surface-mount housing, the TSM250-130 series balances the positive and negative line resistances while reducing the board space used by 50%.” Stephen, Global Product Manager, Littelfuse Li said. “With high surge protection capabilities, it helps end users comply with ITU-T K.20, K.21 and K.45 and Telcordia GR-1089 building internal standards.”

The TSM250-130 Series PPTC has the following key benefits:

  • Combining two 250V PPTCs into one enclosure reduces board space by 50%.
  • The resistor-matched PPTC achieves a positive and negative line resistance balance.
  • Extremely high voltage surge protection helps to gain industry certification.


The TSM250-130 Series PPTCs are available in 3,000 tape and reel packages. Samples are available from authorized Littelfuse dealers around the world.


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