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TI unveils SOIC devices with higher galvanic isolation

02 Oct 2013

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Texas Instruments has rolled out the ISO71xx family of small-outline integrated circuit (SOIC) isolation devices, which includes six triple and quad devices with a galvanic isolation rating of 2.5kVrms. The triple ISO7131CC and quad ISO7140FCC, ISO7140CC, ISO7141FCC, ISO7141CC and ISO7142CC devices are available in 5mm x 6mm QSOP packaging, with retail prices starting at $1.60 for 1,000-unit orders.

The triple and quad devices are based on integrated silicon dioxide capacitors and provide both resistance to electromagnetic interference and lower EMI radiance in harsh environments. They incorporate a glitch filter to smooth operation at lower frequencies. And with a power rating of approximately 1mA per channel, the new isolation devices enable low power in these environments.

The ISO71xx family boasts 2.5kVrms isolation rating, compared to 1kVrms offered by competitive devices in the same package. This results in higher-end performance in tight, space-constrained designs, such as PLCs and inverters. Offered in 16-pin QSOP packages, measuring 5mm x 6mm, the devices reduce board space by up to 72 per cent versus typical 16-pin SOIC packages.

With a typical common-mode transient immunity of ±75 kV/us, these isolation devices provide better immunity in noisy industrial environments, compared to competitive devices that are rated at ±25 kV/us or ±50 kV/us. It provides support for 2.7-, 3.3- and 5-V power supplies, giving designers maximum flexibility in power supply design.

By combining the ISO71xx family with TI's UCC27531, UCC27517 or UCC27211 gate driver ICs, designers can build compact, high-speed, industrial automation systems and offline, isolated switch-mode power supplies where there is need for the PWM control signal to cross the isolation barrier from one side and drive power semiconductor switches on the other side with short propagation delays.

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