Date: 20/08/2010

Two new high voltage latch-up proof, quad SPST switches from ADI

Analog Devices has released ADG5412 and ADG5413, high voltage, latch-up proof, quad SPST switches operating up to ±20 V. The ADG5412 and ADG5413 are designed for instrumentation, automotive, and other harsh environments that are prone to latch-up, which is an undesirable high-current state that can lead to device failure and persist until the power supply is turned off. The new switches can acheive a ESD rating of 8-kV HBM (human body model) thus shields equipment from excess current and eliminates the need for designers to install additional protection circuitry.

“Latch-up, which may trigger a parasitic silicon-controlled rectifier structure, can be caused by many conditions, including poorly managed power supplies, exceeding the device’s max ratings, and glitches or spikes on switch and multiplexer inputs and outputs,” said James Caffrey, marketing and applications director, Converter Group, Analog Devices. “ADI’s ADG5412 and ADG5413 switches are manufactured using a proprietary high-voltage trench isolation process that is guaranteed to prevent latch-up from occurring, even under severe over-voltage conditions.”

The ADG5412 and ADG5413 each contain four independent SPST (single-pole, single-throw) switches. The ADG5412 switches turn on with Logic 1. The ADG5413 has two switches with digital control logic similar to that of the ADG5412. For applications where the analog signal is bipolar, the switches can be operated from dual supplies up to ±20 V. For applications where the analog signal is unipolar, the new switches can be operated from a single-rail power supply up to 40 V. Each switch conducts equally well in both directions when ON and has an input signal range that extends to the power supplies. In the OFF condition, signal levels up to the supplies are blocked. All switches exhibit break-before-make switching action for use in multiplexer applications.

The key features of ADG5412 and ADG5413 are:
--Latch-up proof
--8-kV HBM ESD rating
--Low on resistance less than 10 ohms
--Fast switching times 170 ns
--±9-V to ±20-V dual supply operation
--9-V to 40-V single supply operation
--48-V supply maximum ratings
--Fully specified at ±15 V, ±20 V, +12 V, +36 V
--Rail-to-rail analog signal range

Availability and Pricing:Product Sample
Availability Temperature
Range Price Each Per
1,000 Packaging
ADG5412 Now ?40°C to +125°C $2.18 4-mm x 4-mm
16-lead TSSOP
(thin-shrink small
outline package)
ADG5413 Now ?40°C to +125°C $2.18 4-mm x 4-mm
16-lead TSSOP
16-lead LFCSP