Raychem Announces PolySwitch TSM600-400 Device

Raychem Circuit Protection (Menlo Park, CA), a unit of Tyco Electronics Power Components (Menlo Park, CA), announced its new PolySwitch® TSM600-400, a low-resistance, resettable, over-current protection device for communications infrastructure applications. The RoHS-compliant device helps equipment comply with worldwide telecommunications standards such as Telcordia GR-1089, Issue 3; UL 60950, 3rd edition; and TIA-968-A (formerly FCC Part 68), and can also be used in systems designed to ITU-T K.21 and K.21 recommendations.

The PolySwitch TSM600-400 device, with its surface-mount configuration, small-footprint, and low-resistance, is designed for use in high-density, multi-port linecards and other space-constrained communications network equipment. The TSM600-400 device incorporates two matched, low-resistance, polymeric positive temperature coefficient components in a single package, yielding highly balanced resistance characteristics. Th new PolySwitch device is primarily intended for use in "grounded" communications systems such as POTS and xDSL linecards.

Each of the two resettable, over-current protection components in the TSM600-400 device has a typical resistance of 1.2 Ω, and the two components are typically matched to better than 0.3 Ω. In addition to interrupting ac power faults, the device is designed to help equipment comply with Telcordia GR-1089, Issue 3 lightning tests, and has a rated hold current of 400 mA at room temperature. The device is designed for operating temperatures between -40 °C and +85 °C, and withstands soldering temperatures of up to 260 °C for 60 seconds maximum. The devices are tape-and-reel packaged for compatibility with high-volume assembly processes.

Available now, the TSM600-400 is priced at $1.00 for 100,000-unit quantities. Delivery is eight weeks ARO.