Zener Diodes

A Zener diode is characterized by its ability to protect an object from transient overvoltage pulses as well as overvoltage pulses close to DC, which are difficult to protect against with ESD protection diodes.
In equipment power lines, switching surges with long pulse widths up to milliseconds may be generated when the circuit switches. Zener diodes protect semiconductor devices from switching surges and overvoltage with a frequency close to DC. It can also protect semiconductor devices from ESD[2] with a width of several hundred nanoseconds and inductive lightning surges[1] with a pulse width in the order of microseconds as well. This contributes toward improved equipment reliability.
Zener diodes are available in a wide range of Zener voltage specifications extending from 5.6 V to 82 V. Their extensive application fields include both consumer and industrial electronics.

[1] @IEC61000-4-5, tp=8/20 μs
[2] @IEC61000-4-2

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SOD-962 (SL2)

Package Size

W : 0.62 mm 0.024 inch
L : 0.32 mm 0.013 inch
H : 0.3 mm 0.012 inch
SOD-523 (ESC)

Package Size

W : 1.6 mm 0.063 inch
L : 0.8 mm 0.031 inch
H : 0.6 mm 0.024 inch
SOD-323 (USC)

Package Size

W : 2.5 mm 0.098 inch
L : 1.25 mm 0.049 inch
H : 0.9 mm 0.035 inch
SOD-323HE (US2H)

Package Size

W : 2.5 mm 0.098 inch
L : 1.4 mm 0.055 inch
H : 0.60 mm 0.024 inch
S-FLAT

Package Size

W : 1.6 mm 0.063 inch
L : 3.5 mm 0.14 inch
H : 0.98 mm 0.039 inch
SOT-323 (USM)

Package Size

W : 2.0 mm 0.079 inch
L : 2.1 mm 0.083 inch
H : 0.9 mm 0.035 inch
SOT-23 (SOT23)

Package Size

W : 2.9 mm 0.11 inch
L : 2.4 mm 0.094 inch
H : 0.9 mm 0.035 inch
SOT-346 (S-Mini)

Package Size

W : 2.9 mm 0.11 inch
L : 2.5 mm 0.098 inch
H : 1.1 mm 0.043 inch

All package dimensions are guaranteed in millimeters as mentioned on datasheet. Package dimension in inches is round to 2 significant digits converted with 1mm=0.0393701inch.

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Technical Articles

Diodes / Zener Diodes

Zener diode for overvoltage protection
Zener diodes are suitable for protecting power supply lines, power supply control lines, and can protect internal circuits and ICs from switching surge (overvoltages) induced by hot plugs, etc.

Diodes / Zener Diodes

Zener diode that protects from various surges of overvoltage pulse
A Zener diode is characterized by its ability to protect an object from transient overvoltage pulses as well as overvoltage pulses close to DC, which are difficult to protect against with ESD protection diodes.

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參考設計

PCB photo example of Power multiplexer circuit
Power Multiplexer Circuit Using Common-Drain MOSFET
This power multiplexer circuit with 2 inputs and 1 output is realized on a small board. A new power multiplexer circuit usign common-drain MOSFET has been added to the already developed power multiplexer circuit reference design. These reference circuits allow switching between BBM and MBB modes by combining optimal devices such as MOSFET gate driver ICs and zener diodes from our diverse product lineup.
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PCB photo example of Power multiplexer circuit
Power multiplexer circuit
In this reference design, a Power multiplexer circuit with 2 input and 1 output is implemented on a small PCB. MOSFET gate driver ICs, eFuse ICs, zener diodes and small package MOSFETs selected from Toshiba's diverse lineup are used create ideal diode like characteristics with BBM and MBB switching.
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