1 Features

• IEC 61000-4-5 surge protection:

– 24 A (8/20 μs)

• IEC 61000-4-2 ESD protection:

– ±30-kV contact discharge

– ±30-kV air gap discharge

• 12 V working voltage

• Bidirectional polarity to support positive and

negative voltage swings

• 2 channel device provides complete ESD/Surge

protection with single component

• Small, leaded SOT-23 allows low cost automatic

optical inspection (AOI)

2 Applications

• End equipment:

– Factory automation and control

– Building automation

– Grid infrastructure

– HVAC systems

– Security systems

• Interfaces:

– RS-485

– RS-422

3 Description

The ESDS552 is a bidirectional ESD and surge

protection diode for RS-485 and RS-422 interface

protection. The ESDS552 is rated to dissipate ESD

strikes beyond the maximum level specified in the IEC

61000-4-2 international standard (±30-kV Contact,

±30-kV Air-gap). The device can clamp 8/20 μs

surges with peak pulse currents up to 24 A in

accordance with the IEC 61000-4-5 standard.

The low dynamic resistance and low clamping voltage

help protect systems against transient events. This

protection is key because industrial systems require a

high level of robustness and reliability.

The ESDS552 is available in a small leaded SOT-23

(DBZ) package.