Product News EMC & Thermal Management 3 new thermistors Surface mount EMI Filters for Hi-Rel applications
Ametherm has introduced three new series of surface-mount thermistors for high-accuracy temperature compensation and measurement. The company’s SM04, SM06, and SM08 series are available in 125mW, 200mW, and 250mW maximum power ratings, respectively, and dissipation constants of 1.10mW/°C, 1.50mW/°C, and 2.00mW/°C.
With thermal time constants down to 1.5 seconds and low profiles to 0.35mm, these thermistors are claimed to offer very fast response times while saving space in LCD controls, relay coils, crystal oscillators, and hybrid circuits. They provide a cost-effective alternative to radially leaded NTC and through-hole thermistors. They offer a wide range of resistance values from 200Ω to 470kΩ with tolerances down to 1 percent, beta from 2500°K to 4500°K, and an operating temperature range of -40 °C to 125 °C. Featuring nickel barrier terminations, these series are suitable for wave and reflow soldering and offer a Moisture Sensitivity Level of 2 for high reliability. The devices are available in standard tape-and-reel packaging. Enter 213 Ametherm
www.ametherm.com
The increasing use of SMD filters over conventional panel mounted filters has simplified assembly methods, reduced production costs and enabled smaller volumetric efficiencies to be gained giving a greater choice of options to the designer - particularly shorter lead-times for development samples. Syfer Technology continues to refine existing ranges, explore new ones and bring on board new materials, like lead free dielectrics. For example, the company’s E01 and E07 ranges of feed through MLCC ‘C’ filters now have extended working volt-
ages from 25Vdc to 200Vdc, and in certain cases up to 500Vdc. This will significantly broaden the market for these devices. These surface mount EMI filter 3 terminal chip devices are designed to offer reduced induc- tance compared to conventional MLCC’s when used in signal line filtering. The filtered signal passes through the chip’s internal electrodes with the ‘noise’ filtered to the grounded side contacts, resulting in reduced length noise transmission paths. Available in C0G/NP0 & X7R dielectrics, in case sizes 0603 to 1812. Current ratings are 300mA to 3A with voltage ratings of 25Vdc to 200Vdc (500Vdc in some case sizes).
Particularly effective in replac- ing conventional array filters in medical implantable devices is the company’s E03 (X2Y) range. Available in case sizes from 0603 to 2220 these are integrated passive devices featuring both common and differential mode capacitors in a single MLCC chip.
C0G and X7R dielectric versions are both available options. X7R dielectric versions are available with the company’s FlexiCap termination which is strongly recommended for new designs. Ideal for both signal and power lines, and ensuring good EMI filtering performance, is the com- pany’s SBSP range of surface mount pi-filters. With a size of only a 1206 chip they offer a good combination of size and performance, ideal for telecoms, power supplies and industrial electronic equipment. The operating temperature range of -55°C to 125°C ensures they are also suitable for mil/aerospace applications and have been supplied with addi- tional screening for space use. The use of X7R and C0G ceramic dielectrics sees capaci- tance values from 22pF to 150nF with a 1A current rating. They have working voltages up to 100Vdc. Syfer Technology
www.syfer.com Enter 212
Thermal
Management Solutions by STEGO
Anti-Condensation Heaters Filter Fans - IP55 Lamps, LED Lighting Thermostats + Hygrostats Accessories for Enclosures
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STEGO UK Ltd Unit 12, First Quarter Business Park, Blenheim Road, Epsom, Surrey KT19 9QN Tel. +44 (0)1372 747250, Fax +44 (0)1372 729854
www.stego.co.uk info@stego.co.uk
Enter 13 Electronics OCTOBER 2013
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