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Vishay unveils quad SPST CMOS analogue switches

Posted: 18 Jul 2007     Print Version  Bookmark and Share

Keywords:CMOS switches  power supply sequencing  RoHS 

Vishay Intertechnology Inc. has released two series of quad SPST CMOS analogue switches that combine high switching speeds with high signal bandwidth for use in a wide range of switching applications, including audio, video, data and power.

The Vishay Siliconix DG451 and DG454 series of devices have four independently selectable 44-V SPST switches, each with a typical on-resistance of 4Ω and a typical flatness of 0.2Ω suitable parameters for low-distortion audio signal switching.

All the devices are pin-compatible with the Vishay Siliconix DG411, DG412 and DG413, but with significantly lower on-resistance and faster switching times. Moreover, the DG454 series offers the benefit of not requiring a logic voltage pin. The advantages of this feature include no requirement for a 5V power supply to operate, no need for a PCB trace connecting the logic voltage pin and no need for power supply sequencing.

The DG451 and DG454 are normally closed, while the DG452 and DG455 are normally open. The DG453 and DG456 each have two normally closed and two normally open switches. These choices provide designers with the proper switch condition during power-up to meet the needs of their specific application.

The switches are optimised for analogue switching, including audio, data, video and power switching and DAQ in A/V systems, precision ATE, DAQ systems, relay replacement, communications systems, automotive and avionics systems as well as sample and hold systems.

The high-voltage devices are fully specified with dual supplies at ?5V and ?15V and a single supply of 12V. They feature fast switching speeds of 80ns for turn-on and 60ns for turn-off and offer a ?15V analogue signal range. Power dissipation for the DG451 family is a low 15?W.

All digital inputs have 0.8V and 2.4V logic thresholds, ensuring low-voltage TTL/CMOS compatibility. Each switch conducts equally well in both directions when on and can handle an input signal range that extends to the supply voltage rails.

The devices are offered in a choice of TSSOP16 or SOIC-16 packages and are RoHS-compliant.

Samples and production quantities are available now with lead times of six to eight weeks for larger orders. Pricing for 1,000-piece quantities starts at Rs.79.58 ($1.95) each.

- Ismini Scouras

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