1 Features
• Protection against 1 kV, 42 Ω IEC 61000-4-5
surges for automotive signal lines
• Robust surge protection:
– IEC 61000-4-5 (8/20 μs): 30 A
• Low I/O Capacitance: 14 pF (typical)
• Bidirectional polarity to support positive and
negative voltage swings and miswiring conditions
• Low clamping voltage of 35 V at 24 A for 8/20 μs
surge current protects downstream components
• ± 24 V working voltage for protecting signals on
12-V systems
• Low leakage current of 100 nA (max)
• Integrated level 4 IEC 61000-4-2 ESD protection
– 30-kV ESD protection (IEC 61000-4-2)
• Small SOT-23 leaded package to minimize board
space and allow for automatic optical inspection
(AOI)

2 Applications
• Automotive hybrid, electric and power train
systems
• HEV/EV on-board charger
• EV battery charging communication
– CHAdeMO
– CCS
– GB/T
• Automotive in-vehicle networks
– Controller area network (CAN)
– Local interconnect network (LIN)
• 24-V power lines or digital input or output lines

3 Description
The TSM24CA is low capacitance TVS diode and
is part of TI's surge protection device family. The
TSM24CA robustly shunts up to 30 A of IEC
61000-4-5 (8/20 μs) 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 1 kV
IEC 61000-4-5 open circuit voltage coupled through
a 42 Ω impedance, clamping that surge at 35 V
(I PP = 24 A). The TSM24CA also has a very low
line capacitance of 14 pF which allows it to protect
common automotive communication networks like
CAN from surges in EV charging applications.
Additionally, the TSM24CA 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 extremely low
device leakage and capacitance provides a minimal
effect on the protected line.