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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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1 What is a TVS diode (ESD protection diode)?

An ESD protection diode is a type of Zener diode.
When a diode is reverse-biased, little current flows from cathode to anode. However, when the reverse bias exceeds a certain point (called the reverse breakdown voltage), the reverse current suddenly increases. As the reverse bias is increased, the diode reaches a region of a constant voltage regardless of the current flowing through the diode. The breakdown voltage (Zener voltage) characteristics of Zener diodes are utilized to compose a constant-voltage regulator and suppress surge voltage. Zener voltage regulator diodes are used to maintain a constant voltage whereas ESD protection diodes are used to absorb ESD energy in order to protect an electronic circuit. 

Figure 1.1 Forward and reverse biases across a Zener diode
Figure 1.1 Forward and reverse biases across a Zener diode
Figure 1-2. Diode characteristics
Figure 1-2. Diode characteristics

1 What is a TVS diode (ESD protection diode)?

1-1 Reverse breakdown voltage
1-2 Using different types of protection diodes (ESD protection diodes and Zener diodes for overvoltage protection)
1-3 Differences between protection diodes (ESD protection diodes and surge protection Zener diodes) and diodes for constant-voltage regulation

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