Electronic Design

Passive Components

High-Frequency Inductors Come With 8- To 10-Week Arrival Time
While most inductors have a one-year arrival response time, the HFC and HFI series inductors ensure an eight- to ten-week arrival time. They're designed for signal shaping, RF filtering, and high-frequency RF and wireless communication devices. According to the manufacturer, their ceramic material supplies high SRF, excellent Q, and superior reliability.

The HFC series can be used in high-frequency applications up to 2 GHz. Models come in 0805 and 1008 sizes. The HFI series is designed for high-frequency applications up to 6 GHz. Two compact sizes are available in this series—1.6 by 0.8 by 0.8 mm, and 2.0 by 1.2 by 0.9 mm. The HFI-201209 is available as an 0805-sized device, and the HFI-160808 comes as a 0603-size device.

Pricing varies. For instance, the HFI201209-47NJ costs $0.085 each in 100,000-unit quantities.

Jaro Components, 6600 Park of Commerce Blvd., Boca Raton, FL 33487; (561) 241-6700, ext. 307; (561) 241-3328; www.jaro1.com.

120-dB Attenuator Has 2000-W Peak Power Rating
The 100-SA-MFN-120 is a 120-dB attenuator that has a ±1.5-dB attenuation accuracy. On average, the convection-cooled unit offers 100 W. Its peak power rating is 2000 W. This 50-Ω device has a 1-GHz dc frequency range with a 1.15:1 VSWR. It measures 9.15 by 2.75 by 2.75 in., and it weighs 52 oz. N-type male and female connectors are available. Contact the company for pricing information.

BCP, 10950 72nd St., Suite 107, Largo, FL 33777-1527; (727) 547-8826; fax (727) 547-0806; www.birdfla.com.

Robust Potentiometers Tackle Harsh Industrial Environments
The 148/149 series of single-turn potentiometers features value-added customizing. This can include up to three ganged sections, nonturn lugs, shaft locks, varying shaft lengths, CW/CWW log tapers, dual concentric shafts, solder hooks, SPDT switches, standoffs or support plates, and custom functions. The element in the 0.5-in2 potentiometers is conductive plastic (148) or Cermet (149). Shaft sizes are 0.125 or 0.25 in. With a 5% standard linearity, resistance values range from 500 Ω to 1 MΩ (148) or 100 Ω to 2 MΩ. The 148's standard power is 0.5 W and the 149's standard power is 1 W, both at 70°. The rotational lives for the 148 and 149 are 100,000 and 50,000 revolutions, respectively.

These potentiometers combine an industrial-grade plastic housing, a nickel-plated brass shaft, a substantial element, and extreme stability over a −20°C to 150°C temperature range. Able to withstand high degrees of shock, vibration, and temperature cycling, they can be used in harsh industrial environments as well as in industrial controls and instrumentation. Additionally, the three PCB terminals are plated for solderability.

Priced at $3.94 each in 500-unit lots, the 148/149 potentiometers are shipped from stock. Aggressive volume discounts are available.

Spectrol Electronics Corp., 4051 Greystone Dr., Ontario, CA 91761; (909) 923-3313; fax (909) 923-6765; www.spectrol.com.

Current-Sense Resistors Carry 55-A Current In Automotive Applications
Models in the CSL series of power current-sense devices can carry up to 55 A of continuous current. Designed for automotive circuits and other applications that require high power dissipation and low resistance values, these resistors come with a metal element that has a four-terminal "Kelvin connection." This feature provides current-sensing capability with ohmic values down to 0.00025 Ω. Also, the rugged metal element's inline construction saves significant board space, compared to similarly rated wirewound power resistors. The resistors are rated for 55 A at 70°C, as well. They have low resistance values, ranging from 0.00025 to 0.0025 Ω in tolerances to ±1% and with temperature coefficients of resistance (TCRs) of ±55 ppm/°C.

Typically, CSL series resistors cost $2.60 in 10,000-unit quantities. Delivery is in six to eight weeks.

International Resistive Co. Inc., 736 Greenway Rd., P.O. Box 1860, Boone, NC 28607;

SMD Filter Inductors Target DC-DC Converter Power Supplies
The DR333-7 series SMD filter inductors have a frequency range of 0.1 to 10 MHz and current ratings up to 3.6 A. They're designed to effectively filter second- and third-order harmonics of the ripple frequency in dc-dc converter power supplies rated at 50 W and lower. Five different model families are available, with inductance ranges from 0.47 µH (±20%) at 8 MHz with a maximum 0.025-Ω DCR and 3.60-A rated current to 1000 µH (±10%) at 1 kHz with a 20-Ω DCR at 0.075 A.

All of the models have a −45°C to 85°C operating temperature range. Additionally, custom designs are available. Packages can be as small as 4 by 4.5 by 3.2 mm, making these devices ideal for automated assembly processes where pc-board space is at a premium.

The DR333-7 series filter inductors start at $0.31 each in 25,000-unit lots, depending on circuit options. Inductors are delivered in a variety of customer-specified packaging, including tape-and-reel, from stock to eight weeks.

Datatronics, 281511 Highway 74, Romoland, CA 92585; (909) 928-7700; fax (909) 928-7701; www.datatronics.

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