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.