1 Features

• IEC 61000-4-5 surge protection:

– 25A (8/20μs)

• IEC 61000-4-2 ESD protection:

– ±30kV contact discharge

– ±30kV air gap discharge

• 12V 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 (±30kV Contact,

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

with peak pulse currents up to 25A 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.