Dual channel PPTC protects telecom equipment

October 15, 2019 //By Nick Flaherty
The Littelfuse TSM250-130 reduces PCB space with two telecom PPTC resettable fuses in a smaller surface-mount footprint
The Littelfuse TSM250-130 reduces PCB space with two telecom PPTC resettable fuses in a smaller surface-mount footprint

Littelfuse has launched a series of dual channel 250V telecom PPTC (polymeric positive temperature coefficient) resettable fuses designed to help make telecom and network equipment more reliable.

The TSM250-130 series protects against power cross and induced power surges as defined in ITU, Telcordia GR1089 and IEC 62368-1. Because it combines two resistance-matched PPTCs in a single surface-mount housing, it reduces the board space required by 50%, simplifies assembly, and offers Tip and Ring resistance balance.

Part of the Littelfuse PolySwitch family of resettable overcurrent protection devices for telecommunications and networking equipment, the PPTC series is aimed at Customer Premise Equipment (CPE), Central Office (CO) equipment, Subscriber Line Interface Cards (SLIC) and the VoIP port on set top boxes.

“Featuring two resistance-matched PPTCs in a single surface-mount housing, the TSM250-130 Series delivers Tip and Ring overcurrent protection while using 50 percent less PCB area,” said Stephen Li, Global Product Manager at Littelfuse. “With its high surge capability, it helps end users comply with ITU-T K.20, K.21 and K.45 as well as Telcordia GR-1089 intra-building standards.”

The 1.5W, 0.5Ω dual channel TSM250-130 series has resistance matched PPTCs for Tip and Ring resistance balancing, as well as a surge capability of 2kV for compliance with industry certification.

The TSM250-130 Series PPTCs are available in tape and reel format in quantities of 3,000. Sample requests may be placed through authorized Littelfuse distributors worldwide. 

 The Littelfuse SM250-130 Series PPTC product page


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