DS9502P/TR Datasheet PDF - Dallas Semiconductor -> Maxim Integrated

SPECIAL FEATURES
Zener characteristic with voltage snap–back to protect against ESD hits
High avalanche voltage, low leakage and low capacitance avoid signal attenuation
Compatible to all 5V logic families
Space saving, low inductance TSOC surface mount package
Symmetric dual–port bondout to maximize energy dissipation in protection device
Industrial temperature range