1 Features

• Robust surge protection:

– IEC61000-4-5 (8/20 μs): 20 A

• Low clamping voltage of 33 V (typical) at 20 A

for 8/20 μs surge current protects downstream

components

• Unidirectional polarity for optimized clamping

performance on single ended data lines and power

rails

• 24 V working voltage for protecting signals on 12 V

systems

• Low leakage current of 75 nA (maximum)

• Low I/O capacitance of 24 pF (typical)

• Integrated IEC 61000-4-2 ESD protection

– ±30-kV contact discharge

– ±30-kV air-gap discharge

• Small SOT-23 leaded package to minimize board

space and allow for automatic optical inspection

(AOI)

2 Applications

• Industrial sensors

• Controller area network (CAN)

• PLC I/O modules

• 24-V power lines or digital inputs or output lines

• Appliances

• Medical equipment

• Motor drivers

3 Description

The TSM24B is a part of TI's surge protection device

family. The TSM24B robustly shunts up to 20 A

of IEC 61000-4-5 fault current to protect systems

from high power transients or lightning strikes. The

TSM24B is rated to dissipate ESD strikes beyond

the maximum level specified in the IEC 61000-4-2

international standard (±30-kV contact, ±30-kV airgap).

The TSM24B clamps during a surge event,

keeping system exposure below 33 V (typical) at I PP

= 20 A.

Additionally, the TSM24B is available in a small

leaded SOT-23 (DBZ) package, which is reduced

in size by approximately 50 percent compared to

the industry standard SMA package. The device is

designed to have a minimal effect on the protected

line due to extremely low device leakage.