1 Features

• Robust surge protection:

– IEC61000-4-5 (8/20 μs): 60 A

• Low clamping voltage of 38 V (typical) at 60 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 54 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

• USB Type-C™ VBUS

• PLC I/O modules

• 24-V power lines, digital input, or output lines

• Automotive hybrid, electric, and power train

systems

• HEV/EV on-board charger

3 Description

The TSM24A-Q1 is a part of TI's surge protection

device family. The TSM24A-Q1 robustly shunts up to

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

from high power transients or lightning strikes. The

device offers a solution to the common industrial

signal line EMC requirement to survive up to 2.5 kV

IEC 61000-4-5 open circuit voltage coupled through

a 42 Ω impedance. The TSM24A-Q1 clamps during

a surge event, keeping system exposure below 38 V

(typical) at I PP = 60 A.

Additionally, the TSM24A-Q1 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.

For the bidirectional version of this device, please see

TSM24CA-Q1.