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Thermal cutoff designed for automotive apps

Posted: 31 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:thermal cutoff? RTP? automotive application?

TE Circuit Protection has launched a thermal cutoff that the company said provides a convenient, cost-effective alternative to typical thermal fuses. The RTP200R060SA is a reflowable thermal protection (RTP) device that offers a lower 0.6m (typ) series resistance than the initial RTP device offerings, as well as high-voltage capacity at 32VDC and high-current DC-interrupt ratings of 200A at 16VDC, the company stated.

The device helps protect against thermal-runaway damage caused by MOSFETS, capacitors, ICs, resistors and other power components that can crack and fail. The RTP product is designed for automotive applications such as HVAC, ABS, power steering modules, DC/DC converters and PTC heaters. It also helps protect power components in IT servers, telecom power, LED lighting systems and appliance electronics.

Unlike radial-leaded thermal fuses that must be installed after reflow, the RTP device allows use of standard surface-mount production methods, without the need for special assembly procedures and their associated costs. The RTP device's 200C open temperature helps prevent false activations, particularly in automotive environments, where a 'must not trip' requirement exists for temperatures of 175C.

To allow it to open at 200C in the field, the RTP device uses a one-time electronic activation process to become thermally sensitive. Before activation, it can withstand three Pb-free solder reflow steps (260C peak) without opening. Arming can be implemented during system test or in the field.

"Thermal fuses may also be unsuitable for harsh environments. In comparison, the RTP device is resistant to shock, vibration, temperature cycling and humidity exposure, and is tested to meet or exceed some of the strictest automotive AECQ environmental and life testing requirements," stated Jason Zhao, senior product manager at TE Circuit Protection.

The RTP device is Pb-free and halogen-free, RoHS compliant and allows for conformal coating. it is available now with eight weeks ARO.

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