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Texas Instruments TSM24B Unidirectional Surge Protection Diode

Texas Instruments TSM24B Unidirectional Surge Protection Diode robustly shunts up to 20A 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 (±30kV contact, ±30kV air gap). The TSM24B clamps during a surge event, keeping system exposure below 33V (typical) at IPP = 20A.

Additionally, the Texas Instruments 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.

Features

Robust surge protection
- IEC61000-4-5 (8/20µs) of 20A
A low clamping voltage of 33V (typical) at 20A for 8/20µs surge current protects downstream components
Unidirectional polarity for optimized clamping performance on single-ended data lines and power rails
24V working voltage for protecting signals on 12V systems
Low leakage current of 75nA (maximum)

Low I/O capacitance of 24pF (typical)
Integrated IEC 61000-4-2 ESD protection
- ±30kV contact discharge
- ±30kV air-gap discharge
Small SOT-23 leaded package to minimize board space and allow for automatic optical inspection (AOI)

Applications

Industrial sensors
Controller area network (CAN)
PLC I/O modules
24V power lines or digital inputs or output lines

Appliances
Medical equipment
Motor drivers

Texas Instruments TSM24B Unidirectional Surge Protection Diode

Features

Applications

Functional Block Diagram

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