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Digital optocouplers target high-temp apps, EVs

Posted: 17 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:optocoupler? electric vehicle? car battery?

Avago Technologies Ltd has rolled out three digital optocouplers that comply with AEC-Q100 Grade 1 stress test requirements for automotive applications. The ACPL-K4xT devices are part of the Avago R2Coupler range of optocouplers with reinforced insulation for reliable signal isolation. According to the company, the products are designed for onboard chargers for hybrid and electric vehicles (EV) and other high-temperature industrial applications.

The devices offer working voltage performance of up to 1.14kV allowing standardization of battery management solutions for mid-voltage car, high-voltage bus and truck batteries, and even high voltage battery topologies. They also deliver supply voltage range up to 20V.

Onboard chargers take in high-voltage, high-current supply to charge quickly, demanding robust isolation of up to 8kV peak transients. The reinforced insulation of the optocouplers meets these requirements, delivering safe electrical signal isolation over an operating temperature range of -40C to 125C. Additionally, the devices' small surface-mount package meets the 8mm creepage and clearance distance required for high-voltage safety regulations.


The optocoupler features a working voltage performance up to 1.14kV.

The devices feature 30kV/?s (typical) common mode rejection (CMR) at V(CM)=1.5kV. The low power consumption of the ACPL-K4xT optocouplers helps prevent battery management systems from draining vehicle batteries, said the company. The devices feature no quiescent current and thus do not draw power in the 'off' state. The current consumption of both their LED and detector IC can also be reduced as low as 1.5mA/channel for low-speed switching operation.

The ACPL-K4xT optocouplers are compliant with multiple safety standards, including UL 1577 at 5kVRMS/min, IEC 60747-5-5 with an 8kV peak transient rating for up to 1140V working voltage, EN/DIN EN 60747-5-2 and CSA. The single-channel ACPL-K43T device and dual-channel ACPL-K44T device each operate at 1MBd, while the single-channel ACPL-K49T device operates at 20kBd.

The devices are lead-free, RoHS 6-compliant and come in stretched 8-lead SO packages. Samples and production quantities of the ACPL-K4xT digital optocouplers are now available.

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