Electronic Design

Passive Components

Multilayer NTC Chip Thermistors Come In 0402 And 0603 Sizes
The TBP high-reliability NTC chip thermistors are 63-mW devices with values from 47 Ω to 150 kΩ. These devices are available in both 0402 and 0603 sizes.

With a B constant of 2950 to 4750 at 25°C to 85°C, the thermistors are highly sensitive. Based on multilayer construction, the devices have a broad operating-temperature range of −55°C to 125°C. A thermal-time constant of less than 5 s and a heat-dissipation constant of 1 to 2.5 mW/°C are also provided. Negligible resistance change is demonstrated in 1000-hour reliability tests. According to the company, these thermistors are suited for use in telecommunications equipment, consumer electronics, and battery-protection applications.

For pricing and availability information, contact the company.

Taiyo Yuden Europe GmbH, Nordring 23, 90765 Fürth, Germany; +49 911 9364 0; fax +49 911 9364 190; www.taiyo-yuden.com.

Toroidal Inductors Can Be Mounted Horizontally Or Vertically
Members of the 2100/2200/2300 series of high-current toroidal inductors possess a self-shielding toroid core that reduces radiation emission. Equipped with cost-effective, low-loss powdered cores, the devices are available in both horizontal and vertical mounting configurations.

According to the company, these inductors are suited for high-current, high-frequency, and high-density designs in differential mode choke, EMI filter, and energy-storage applications. They may also function in such applications as dc output chokes, fly-back inductors, and light dimmers. Basic performance specifications include an inductance range of 10 to 1000 µH and an operating-temperature range of −55°C to 105°C. In 500-unit quantities, the devices cost between $1.02 and $1.67 each.

J.W. Miller Magnetics, 306 E. Alondra Blvd., P.O. Box 2859, Gardena, CA 90247-1059; (310) 515-1720; fax (310) 515-1962; www.jwmiller.com.

100-W Coupler Offers A Frequency Range Of 800 To 2500 MHz
The 100-AC-FFN-20 is suited for cellular and PCS applications. As a 100-W coupler, this device offers a frequency range of 800 to 2500 MHz. Coupling at 20 dB, it also provides a directivity minimum of 20 dB.

This coupler provides an insertion loss of 0.25 dB as well as 0.3-dB thruline. Maximum VSWR is rated at 1:15:1. While reflected power depends on the external load used, the frequency sensitivity is ±1.0 dB maximum. With a weight of 8 oz., the device operates for temperatures up to 105°C.

In one- to 10-unit quantities, the coupler costs $175 each.

Bird Component Products, 10950 72nd St. C., Ste. 107, Largo, FL 3377-1527; (727) 547-8826; fax (727) 547-0806; www.birdfla.com.

Surface-Mountable Resettable Fuse Targets Power LAN Applications
The surface-mountable SMD030-2018 polymeric positive temperature coefficient (PPTC) resettable fuse provides overcurrent protection for sensitive communication circuits. The device suits power LAN applications.

In compliance with the IEEE802.3af data standard, the device protects powered LAN switches, power patch panels, and powered data-terminal equipment (DTE) against potential power fault hazards. It is designed for reflow installation. Tape-and-reel packaging is available.

In 100,000-unit quantities, the SMD030-2018 costs $0.30 each.

Raychem Circuit Protection, 300 Constitution Dr., Menlo Park, CA 94026-1164; (800) 227-7040; www.circuitprotection.com.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.