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Tiny voltage sensing optocouplers fit industrial apps

Posted: 07 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:optocoupler? voltage sensing? current sensing?

 ACPL-K370/K376 optocouplers

Avago Technologies rolls two new miniature voltage/current threshold detection optocouplers that are suited for industrial control applications. The ACPL-K370/K376 optocouplers are designed to detect AC/DC sources and convert the voltage to a logic interface across an optical coupling barrier to provide safe isolation in electronically noisy environments found in industrial applications. These devices may be used in limit switch sensors, low-voltage detectors, relay contact monitors, relay coil voltage monitors and current sensors.

The new ACPL-K370/K376 series, which are an upgrade from Avago's HCPL-0370/3700/3760 optocoupler family, uses threshold sensing input buffer ICs which permit control of threshold levels over a wide range of input voltages up to 1,140Vpeak, with a single external resistor. Some of the key benefits provided by this new optocoupler series include a smaller stretched SO-8 package, which meets 8mm clearance and creepage requirements, and requires 30 percent less PCB space compared to DIP-8. Also, the input buffer of these optocouplers offer several key features to enhance threshold sensing such as hysteresis for extra noise and switching immunity, a diode bridge for easy use with AC input signals, and internal clamping diodes to protect the buffer and LED from a wide range of over-voltage and over-current transients.

The ACPL-K376 is a low-current version of the ACPL-K370. To obtain lower current operation, the ACPL-K376 uses a high-efficiency AIGaAs LED which provides higher light output at lower drive currents.

The key features of the ACPL-K370/K376 optocouplers include 5 percent voltage detection accuracy; wide AC or DC detection range up to 1,140Vpeak; user configurable single/dual detection levels; built-in hysteresis improves noise immunity; 1.32mA very low threshold current for the ACPL-K376; logic compatible output; 2V to 18V wide output supply voltage; operating temperature range of -40C to +105C; SSO-8 package with 8 mm creepage and clearance; pending safety approvals for reinforced insulation IEC/EN/DIN EN 60747-5-5/UL 1577 5kVrms/CSA.

The optocouplers are available now. Pricing starts at $1.80 and $3.25 each for the ACPL-K370 and ACPL-K376, respectively, in minimum quantities of 10,000. Samples and production quantities are available now through Avago's direct sales channel and worldwide distribution partners.

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