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.