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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.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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1-3 Differences between protection diodes (ESD protection diodes and surge protection Zener diodes) and diodes for constant-voltage regulation

Figure 1.6 Operation of a protection diode (Example of a Zener diode application)
Figure 1.6 Operation of a protection diode (Example of a Zener diode application)

A protection diode is a type of Zener diode. Zener diodes can be used not only as protection diodes but also as constant-voltage regulators. Protection diodes are specifically designed to protect electronic circuits from ESD and other transient pulses. In contrast, Zener diodes for constant-voltage regulation remain conducting in breakdown mode.

Protection diodes

Protection diodes are used as voltage clampers for surge protection. These diodes are designed to conduct in the event of excessive voltage being applied to a circuit.

Diodes for constant-voltage regulation

The voltage that appears across a diode when a small current (IZ) is passed from cathode (K) to anode (A) is used as a constant-voltage source (VZ). The amount of power that can be applied is constrained by the permissible power dissipation of the diode and the board on which it is mounted.

Figure 1.7 Operation of a diode for constant-voltage regulation
Figure 1.7 Operation of a diode for constant-voltage regulation

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

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)

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