Electronic Design

Trimmer Pots Use Less Expensive Open Form Factor

Now that the advent of "no-wash" board processing systems has eliminated the need for expensive sealed trimmer potentiometers, TT Electronics' BI Technologies Electronic Components Division has introduced a complete line of open-type trimmers. The RoHS-compliant single-turn devices come in seven models with cermet, carbon, or conductive plastic elements.

Six of the potentiometers feature resistances of 100 Ω to 1 MΩ. Sizes range from 3 to 15 mm, with all but the smallest available with side as well as top adjustment. Power ratings run from 0.1 to 0.5 W. Operating temperature ranges of –10°C to 70°C through –40°C to 125°C are available. Standard tolerances are ±20% to ±30%. The seventh version, the Model 91, features a 10-Ω to 2-MΩ resistance and is a 3/8-in. top and side cermet trimmer. It's rated at ±20% and 0.5 W, with an operating temperature range of –55°C to 125°C. The company will also produce trimmer pots to meet specific customer requirements.

Typical pricing for the open-type trimmers ranges from $0.08 to $0.18, depending on quantity. Lead times are from stock to six weeks. For more information, visit BI Technologies.


NEWS IN BRIEF: CAPACITORS

As part of Vishay Intertechnology's Tantamount family, the T95 Hi-Rel COTS tantalum capacitors offer designers ratings not found in available MIL specifications. They also provide the flexibility and convenience of a commercial product without costly, time-consuming specification development. These conformal-coated devices come in capacitances of 0.1 to 680 µF and voltage ratings of 4 to 50 V. They offer the option of low equivalent series resistance values — down to 0.055 Ω at 25°C and 100 kHz. Also, they operate from –55°C to 125°C. Lead times are eight to 10 weeks for larger orders. Prices depend on ratings and screening options. Go to www.vishay.com.

The Flexiterm series of capacitors from AVX Corp. now includes high-voltage devices. The new Flexiterm V+ components feature ratings from 600 to 3000 V available in case sizes from 1206 to 2220. They offer high value, low leakage, and small size in a rugged package that won't crack under extreme board flexure or temperature damage cycle conditions. They come in a RoHS-compliant matte tin finish or with a lead-tin finish. Prices start at $0.03, with availability from stock to 10 weeks. For more information, go to www.avx.com.

Kemet Corp. has released 22 established-reliability part numbers qualified to MIL-PRF-55365/4 and /11, styles CWR09 and CWR29, for both the T409 and T429 series. These additions expand the company's portfolio of CWR-style offerings to include the complete listing of 50-V CWR09 and CWR29 styles. They offer 100% surge current testing as an option for all case sizes, along with Weibull grading (B and C levels). Each series comes in eight case sizes with capacitance values of 0.1 to 4.7 µF. For additional information, go to www.kemet.com.


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