Thick-film chip resistor operates to 250°C
TT electronics Welwyn Components has introduced a new series of thick-film chip resistors qualified for operation up to 250°C. The new HTCR series is available in 0805, 1206, 2010 and 2512 formats and, with resistances from 1R0 to 10M, ensures high reliability for applications in down-hole drilling, automotive, aerospace and defence applications.
Four termination options provide support for the wide range of assembly methods used in high-temperature designs, including wire bonding, adhesive and soldering processes.
Planar gold G-type and PtAg P-types are produced by printing electrodes, resistor and over-glaze onto an alumina substrate, then laser trimming the resistance elements to the required value. These devices are suitable for attachment with conductive adhesives; G-type resistors with gold terminations are additionally suited to wire bonding.
The EW versions feature thick-film PtAg electrodes printed onto alumina along with the resistor material and over-glaze. They are also ideal for adhesive assembly, having terminations coated with a polymer silver wrap-around. F-types are made in the same way as EW, and then prepared for solder assembly by plating with a nickel barrier and 100% tin.
As well as high-temperature performance, the HTCR series includes non-magnetic resistors, providing solution for applications like medical MRI scanning equipment. Furthermore, the series’ absence of organic materials makes HTCR resistors the perfect choice for high vacuum space and scientific designs.
The new high-temperature resistors series are RoHS compliant, available now, and supplied on tape-and-reel for automated assembly.
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