Welwyn Components, a TT electronics company, designs and manufactures electronic components for customers across defense and aerospace, medical, transportation, energy and industrial electronics markets. Key applications are circuit protection, power and energy management, medical device equipment and signal conditioning. Products include: fixed resistors - current sense, high power, precision, fusible, flameproof, high voltage/value, surge/pulse, general purpose and dividers.
TT electronics/Welwyn PCF Series Thin Film SMT Resistors are constructed from a thin-film material selectively deposited on a 96% alumina substrate with metallic contacts at each end and supplied with 100% Sn matte plated wrap-around terminations suitable for soldering. The wrap-around terminations supplied to the PCF Series Thin Film Resistor chips from TT electronics/Welwyn have an electroplated nickel barrier and tin coating that ensures excellent "leach" resistance properties and reliable contact to the PCB. These robust resistors can operate at a maximum temperature of 125ºC, and up to 155ºC for higher power grades. PCF Series Thin Film Resistors offer an extended ohmic range from 1R-3M and superior humidity performance at a passivated range.
Welwyn's RC Series Precision Metal Film Resistors are CECC-released devices with low TCRs over a wide resistance range. Other features of Welwyn's RC Series resistors are resistance tolerance down to 0.05%, low noise and negligible voltage coefficient, and screened parts available for critical applications. Express delivery is available for this product.
The WH Series Aluminum Housed Wirewound Resistors from Welwyn have an all-welded construction and high-power dissipation up to 300W. Welwyn's WH Series wirewound resistors are suitable for severe environments and designed for excellent thermal conductivity to heatsinks. In addition, these resistors offer a spade terminal option and are RoHS compliant.
The HVC Series High-Voltage Chip Resistors from Welwyn offer continuous voltages up to 3kV and overload voltages up to 4kV. In addition, Welwyn's HVC Series high-voltage chip resistors have values up to 100M, tolerances to ±0.5%, ambient temperature range of -55 to +155ºC, and robust thick film construction.
Welwyn's DSC Series Double-Sided Chip Resistors have two parallel resistance elements in a single chip. Other features of the DSC Series chip resistors from Welwyn include excellent pulse withstand performance, operating temperature range of -55 to +155ºC, enhanced working voltage and power rating, and Pb-free terminations. The DSC Series is also laser trimmed up to 0.5% tolerance.
The PWC Series Chip Resistors from Welwyn offer excellent pulse withstand performance and improved working voltage. In addition, Welwyn's PWC Series Chip Resistors have standard chip sizes (0805 to 2512), improved power rating, operating temperature range of -55 to +155ºC, and custom designs available.
Welwyn's W20 Series Wirewound Resistors are CECC approved and offer high stability and reliability. Suitable for harsh environments, the W20 Series resistors from Welwyn have an impervious lead-free vitreous enamel coating. In addition, these resistors feature high-power dissipation for their size and overload characteristics ideal for protection circuits.
The Welwyn ULW Series UL Recognized Wirewound Resistors are fusable resistors with failsafe AC fusing at 120 / 240Vrms, inrush and surge withstanding. With a UL940V0 flameproof coating, the ULW Series offers power ratings of 2W, 3W, 4W, and 5W. The Welwyn ULW Series UL Recognized Wirewound Resistors are available SMD and are RoHS compliant.
Welwyn EMC Series Pulse Withstanding Resistors feature failsafe 240V AC fusing with good pulse handling capability. The flameproof (UL94-V0) metal film resistors are a small size for the 2W power rating. The Welwyn EMC Series Pulse Withstanding Resistors offer a resistance range of 4R7 - 68R Ohms and are UL1412 recognized.