Tyco Electronics today announced a breakthrough technology that enables manufacturers to incorporate surface mount thermal protection devices into their RoHS- compliant standard reflow assembly process. Manufacturers will save a lot of money by transitioning from manual assembly to cost-effective surface mount device (SMD) processes. This Reflowable Thermal Protection ( RTP ) device uses industry-standard component placement and lead-free reflow soldering equipment to enable quick and easy installation. The unique feature of this RTP device is its ability to withstand multiple reflows with peak temperatures well in excess of 200 ° C. However, when it detects temperatures above 200 ° C in practical applications, an open circuit is formed.
The first device in the RTP product line to be introduced is the RTP200R120SA (RTP200), which helps meet some of the most stringent requirements of the AECQ specification for automotive electronics. The RTP200 device can be used to replace redundant redundant devices such as power FETs, relays, and heavy-duty heat sinks that are often used in automotive design, while providing a powerful feature for IT servers, communications power supplies, and other industrial applications. solution. The RTP device helps prevent heat loss damage caused by cracking and failure of capacitors, integrated circuits (ICs), resistors, and other power components, or prevents thermal effects caused by any corrosion.
The RTP200 device features a low series resistance of only 1.2mOhm (typical) and a high current DC interrupt rating of 200A at 16V DC and 100A at 32V DC. This thermal protection device is used to help meet the reliability requirements of various automotive power electronics systems, including ABS, cooling fans and power steering systems. The 200°C open-circuit temperature of the RTP200 device helps prevent false triggering and improve system reliability because this temperature is higher than the normal operating range of most normally functioning electronic products, but lower than the melting point of typical lead-free solders. . Therefore, if the surrounding components are operating within their target temperature range, the RTP200 device will not break, but it will create an open circuit before the temperature rises to a potential risk that an component will be desoldered and an unexpected short circuit occurs.
In order to enable it to be disconnected at 200 ° C under practical application, the RTP device uses a one-time electronic activation procedure to make it thermally sensitive. It can withstand 3 lead-free solder reflow steps without breaking before activation. The electronic activation time node is determined by the user and can be automatically implemented during system startup or system testing.
The thermal sensitivity of the device is beneficial because in some cases, a failed power supply component may not produce a complete short-circuit overcurrent condition, but a resistance short circuit may be generated, in which case a conventional fuse But can not be disconnected. This type of event may actually reduce the load current, but can still cause unsafe thermal runaway conditions. The RTP200 device helps prevent damage caused by complete short circuit and resistive short circuit conditions.
The RTP200 device resists shock, vibration, temperature cycling and wet environments. It has also been tested to meet or exceed some of the most stringent automotive AECQ environmental and life testing requirements. To simplify installation, improve system reliability, and optimize thermal coupling to printed circuit boards (PCBs), the reflowable RTP200 device can be mounted using standard SMD processes without any special tools or manual installation. The device also helps save valuable board space in a cost-effective design.
This lead-free RTP200 device is also halogen-free, RoHS compliant and supports conformal coatings. Based on this new scalable technology, follow-on products including a 0.6mOhm RTP device will continue to expand the product line of Tyco's electronic circuit protection solutions.
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