PASSIVE SOLUTIONS

Wire Wound Inductors Suit Wireless Applications

Chip coils are essential elements of most electronic products incorporating RF circuitry, as they are specifically designed for EMI suppression of high frequency circuits. Murata offers the industry’s widest line-up of such devices, with designs including monolithic, wire wound and film types, suitable for practically any application.



In increasing numbers of applications, low cost and small size are of paramount importance, and the trend is for components with higher accuracy (inductance), high Quality factor (Q), higher current and lower DC Resistance (DCR).

In applications where Q is important, such as most high frequency circuits used in digital TV tuners, wireless LANs and Bluetooth enabled systems, Murata’s wire wound design and construction with a miniature aluminium core is an excellent choice. With high self-resonant frequency, stable inductance at high frequency and low DCR, this design is particularly suitable for low loss, high output and low power consumption.

Murata’s LQW15A and LQW18A RF chip coils are the devices of choice for high Q applications. With a wide inductance range, the LQW18A, contained in a compact 0603 package, has a typical Q of 90 at 1GHz (33nH). Rated current is 75mA to 850mA and self resonant frequency is typically 3.2GHz. A version with even higher Q (100) is also available.

If smaller size is more critical, the LQW15A, in a 0402 footprint, features a Q of 70 at 1GHz (5.8nH), rated current from 110mA to 1A and self-resonant frequency of 8GHz minimum. Again, Murata offers a higher Q rated version (80).

For highly price sensitive and miniaturised alternatives, Murata’s LQW04A series devices fit in half the volume and 60% of the mounting area. Measuring just 0.8mm x 0.4mm with a low 0.4mm profile, the devices have a resin-coated surface making them particularly suitable for high density mounting. A typical Q of 50 at 1GHz (5.6nH) allows for design trade-offs in specific applications.

The RF chip coils are manufactured in Japan using Murata’s advanced manufacturing techniques and parts are readily available on current ten week lead times. The LQW15A and LQW18A coils can be supplied on reels of 10,000 and 4,000 parts respectively. Devices are fully compliant with RoHS legislation.

Features

• Wide range of RF chip coils
• High self-resonant frequencies
• Stable inductance at high frequency
• Low DCR
• Low loss
• High output
• Low power consumption
• RoHS compliant
• LQW18A
  • 0603 package
  • Q up to 100 at 1GHz
  • Q = 90 at 1GHz (33nH) typical
  • Rated current up to 850mA
• LQW15A
  • 0402 package
  • Q up to 80 at 1GHz (5.8nH)
  • Rated current up to 1A
• LQW04A
  • 0.8mm x 0.4mm 0.4mm
  • Typical Q of 50 at 1GHz (5.6nH)

Applications

• Wireless communication
  • Consumer
  • Industrial
  • Medical
  • Office automation
  • Home automation
  • Automotive
  • Environmental monitoring
• Digital TV tuners
• Wireless LANs
• Bluetooth

For further information, including a copy of the Murata Chip Coil Catalogue, please click here