Diotec Semiconductor AG

Although these operating conditions are often grouped together, ISO 16750-2 specifies different voltage requirements for each. During a jump-start event, electronic systems may be exposed to supply voltages of up to +24 V, while a reverse battery event can subject the circuitry to voltages as low as - 15 V. These differing thresholds present a challenge for protection devices that rely on a single, symmetrical stand-off voltage.

According to Diotec, conventional TVS diodes are typically optimized for one operating condition or represent a compromise between the two. A higher stand-off voltage selected to withstand +24 V jump-start conditions may provide unnecessary margin in reverse operation, whereas a lower threshold optimized for reverse battery protection can reduce the available design margin during jump-start events.

To address this challenge, Diotec developed the ESDB1524GW-AQ with an asymmetric stand-off voltage characteristic. The device features a +24 V stand-off voltage in the forward direction and a –15 V stand-off voltage in reverse, enabling protection levels that correspond directly to the limits defined by ISO 16750-2 rather than relying on a single symmetrical threshold.

The TVS diode is intended for automotive communication interfaces such as LIN and CXPI, where both electrical stress scenarios must be considered during system qualification. In addition to its asymmetric protection concept, the device offers ±30 kV ESD robustness and a peak pulse power capability of 200 W, supporting reliable operation in demanding automotive environments.

With the ESDB1524GW-AQ, Diotec demonstrates an application-specific approach to transient protection, aligning the device characteristics with the actual voltage requirements of modern automotive electronics. By matching the protection thresholds to two fundamentally different fault conditions, the company aims to provide circuit designers with a more optimized alternative to conventional symmetrical TVS solutions.