TT Electronics - Welwyn Components
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ELECTRONICS
We design and manufacture a full portfolio of resistor technologies as well as a wide portfolio of hybrid microcircuits and mutli-chip modules. Our product offering is comprehensive, with 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. Designers rely on our components for critical products from energy meters to motor drives.
The surface-mount LRMAH2512 high-power shunt resistors from TT Electronics deliver precision and surge-resistant current measurement. With a 6W power rating, and AEC-Q200 approval, the metal alloy LRMAH2512 can be used in motor control, power supply, and battery management. Values are down to 200µΩ at 1% tolerance, and TCR is down to 50ppm/°C.
For more infomation, please contact sales@charcroft.com.
ULR2N is the latest addition to TT Electronics’ portfolio of metal element current sense shunt resistors. It is designed in inverse format with terminations on the long sides, which gives good resistance to thermal and board flex stresses and supports the use of wide current traces. With a precision of down to 1% tolerance and 170ppm/°C, ULR2N offers a choice of 5 ohmic values from 1 to 3mΩ. Rated at 2W, this product is suitable for sensing currents at levels up to 45A, and is therefore in many cases restricted only by the current carrying capacity of the PCB traces. The bulk metal technology used for these parts gives high energy capacity for current surge events, compared to film or foil alternative technologies.
LRMA Series: Low Resistance Metal Alloy Resistor
MFC Series is the latest addition to TT Electronics’ portfolio of surface mount resistors for compact current sensing functions.
With AEC-Q200 qualification available and in six sizes from 0402 to 2512, the MFC Series offers a broad range of options in the 2 to 200mΩ range.
Precision to ±0.5% and ±50ppm/°C is available and the metal foil technology combines the heat spreading properties of a ceramic substrate with the surge tolerance of a bulk metal alloy resistance element.
APC is the latest addition to TT Electronics’ portfolio of surface mount resistors qualified for use in environments exposed to sulphur-bearing gasses. Tested to both ASTM-B-809-95 and the newer EIA-977 standards, this offers designers of high precision analogue circuits an accurate and stable resistor which will remain reliable in polluted environments. With nineteen combinations of size, sulphur protection grade and power range, APC covers a broad range of resistance requirements at tolerances down to ±0.05% and TCRs to ±10ppm/°C.
ULR3N is the latest addition to TT Electronics’ portfolio of metal element current sense shunt resistors. It is designed in inverse format with terminations on the long sides, which gives good resistance to thermal and board flex stresses and supports the use of wide current traces.
With a precision of down to 1% tolerance and 100ppm/°C, ULR3N offers a choice of 15 ohmic values from 100μΩ to 3mΩ. Rated at 3W, this product is suitable for sensing currents at levels up to 170A, and is therefore in most cases restricted only by the current carrying capacity of the PCB traces. The bulk metal technology used for these parts gives high energy capacity for current surge events, compared to film or foil alternative technologies.
DPCR is the latest addition to TT Electronics’ portfolio of thick-film surface mount resistors for high surge energy applications. It has been developed specifically to withstand the surge energy of medical defibrillators. By preventing electrical energy from being diverted into sensitive monitoring equipment connected to the patient, it avoids any reduction in the effectiveness of defibrillation, whilst also protecting the equipment.
Qualified against defibrillator surge standards, it has also been characterised to Electro-Static Discharge (ESD) standards, shortening time to market for medical equipment designers. Standard in common values 10kΩ (requires two pieces in parallel), 20kΩ and 51kΩ, other E24 values up to 100kΩ are available on request.
IGN series offers precision-engineered solutions for electro-pyrotechnic ignition systems. The IGN line leverages decades of thin film design experience to produce customized solutions that provide fast, reproducible ignition. These products are based on two electrical igniter categories – thermal igniters and percussive igniters. The latter are also known as exploding foil initiators or “slappers”.
WCM is the latest addition to TT Electronics’ portfolio of surface mount high pulse resistors. The cylindrical MELF format gives the maximum film area in a compact footprint, and the use of carbon film technology results in far higher capacity for surge energy than is found in metal film versions. The high pulse performance makes this product ideal for circuit protection in data and power lines. Available in 0207 and 0204 sizes and with a high power option at a 1W rating, WCM offers a wide ohmic range from 7R5 to 10M.
GBCN is the latest addition to the TT Electronics range of green thick film resistor products. It is essentially a variant of BCN 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.
The part contains an array of four isolated resistor elements in a 1206 footprint. It is ideal for use in pull-up, pull-down, level shift and termination functions in digital circuits and in compact analogue circuits.
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)