TT Electronics - Welwyn Components
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Welwyn Components are a designer and manufacturer of a full portfolio of resistor technologies, serving the industrial, defence, automotive and medical sectors.
With a fully comprehensive product offering, Welwyn offer an ohmic value range spanning 18 decades, and many innovations in the field of high power steel resistors, safety qualified fusing resistors and high energy surge tolerant parts.
We stock the full range of Welwyn products.
EBW8518 is a busbar-mounted shunt resistor for high current measurements in the hundreds of amps range.
This product is an electron beam welded resistance element sandwiched between large copper terminals with optional tin plating. A variety of voltage sense terminal styles may be made available as custom options.
Precision applications can make use of the 1% tolerance, 100ppm/°C TCR, 1µV/°C thermal EMF and separate ground pins to reduce errors.
HDSC is the latest addition to our range of pulse withstanding chip resistor products. It is essentially a variant of DSC with no laser trimming applied. This maximises the level of surge performance available in a single-sided flat chip design.
Available in four sizes from 0805 to 2512, HDSC withstands up to 6.5kV peak for a 1.2/50µs surge and up to 6kW for a 0.1ms pulse. It is ideal for protection and discharge applications in compact power supplies and power control circuits where a resistance tolerance of 5% is adequate.
TJC is designed to provide a thermally conductive pathway with electrical isolation. It may be used as a thermal management solution for cooling PCB hotspot areas.
TJC is made from aluminium nitride, which has around 5 times the thermal conductivity of alumina. As well as providing electrical isolation, it also has a greater thermal conductivity than the equivalent footprint of 70µ copper, and so gives a better thermal connection than an uninterrupted trace.
WIN-T0402 adds a new smaller size to the existing three sizes of the WIN series. This allows our new generation to be used in more compact applications, such as server power supplies, process control, safety critical systems, exposed telecom systems, portable medical products, and aerospace COTS.
UPCA164 is an ultra-precision chip array which incorporates four resistor elements in a compact 1206 footprint. This is a nichrome film precision part, like the existing PCA but with a threefold improvement in temperature stability.
GHVC is the industry’s first high voltage chip resistor which is completely free of Pb and its compounds and therefore is RoHS compliant without exemption.
GHVC is the latest addition to our range of high voltage chip resistor products. It is essentially a variant of HVC designed using green thick-film materials which are completely free of Pb (lead) and its compounds. This allows the product to be RoHS compliant without relying on exemptions which may be withdrawn in the future. Available in three sizes from 1206 to 2512, GHVC has LEVs in the range 1 to 3kV and withstands up to 7kV peak for a 1.2/50µs surge. It is ideal for high voltage sensing and protection in compact power supplies, circuit breakers and medical monitors.
WDBR-UL series is a thick film on steel power resistor with UL recognition. It has been developed based on the existing WDBR product which itself has been successfully used in the field for over ten years. The creepage and clearances and power ratings have been assessed in accordance with the requirements of UL508.
For circuit designers who need to design UL approved systems containing power resistors in highly compact enclosed assemblies with heatsink-based thermal management, we provide WDBR-UL which provides a far lower volume solution than competing encased wirewound products and a faster route to safety certification.
CR series is a thick film chip resistor designed for high reliability applications. Until now there have been four standard sizes for solder terminations and CR0603 adds a fifth, smaller size to the range. With the same value range 1R0 to 10M, CR0603 provides a high reliability component in compact circuits where footprint is critical.
HR series is a thick film chip resistor designed for high ohmic value applications. Until now there have been two standard sizes for solder terminations and HR0603 adds a third, smaller size to the range. With the value range 10M to 20G, HR0603 provides a stable, high ohmic value component in compact circuits where footprint is critical.
The WMHP-HS is a PCB mounting heatsink tailored for WMHP series power resistors. It is a compact and lightweight thermal management solution with a small PCB footprint. It can accommodate both TO-220 and TO-247 package styles, thus covering the whole range of WMHP ratings from 20 to 100W.
For circuit designers who need to manage temperature rise in compact power electronic assemblies we provide WMHP-HS which provides more effective cooling with lower mass than the key competing part (Ohmite)