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Lineup Expansion of Zener Diodes for Power Line Protection Contributing to Improvement of Equipment Reliability

February 18, 2022

Diodes

Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched 10 Zener diode products in its "CUHZ series" to expand the lineup. The products protect semiconductor devices from switching surges, inductive lightning surges[1], and electrostatic discharge (ESD)[2].

In power lines of equipment, switching surges up to the order of thousands volts with long pulse widths up to milliseconds may be generated when the circuit switches. The new products protect semiconductor devices from switching surges and overvoltage with frequency close to DC. They can also protect semiconductor devices from ESD[2] with several hundred nanoseconds width and inductive lightning surges[1] with pulse width in the order of microseconds as well. And they absorb surges better by lower dynamic resistance and lower clamp voltage compared to the existing products. Comparing with the existing product CUZ5V6, the new product CUHZ5V6 has reduced its dynamic resistance by about 88 % and clamp voltage by about 37 %. This can reduce the surge voltage applied to a semiconductor device, helping improve the reliability of equipment.
The package used is SOD-323HE (US2H) that has a high allowable power dissipation rating[3], allowing the products to be used for applications requiring high allowable power dissipation.
The 10 products in the lineup cover a range of Zener voltage (typ.) from 5.6 V to 36 V, supporting major power lines. The expanded lineup supports various voltage lines and mounting areas.

Notes :
[1] @IEC61000-4-5, tp=8/20 μs
[2] @IEC61000-4-2
[3] 1200 mW@mounted on a glass epoxy circuit board of 25.4 mm × 25.4 mm × 1.6 mm, Cu pad : 645 mm2

Features

  • Allows protection from surges with wide pulse width range in the order of microseconds to milliseconds
  • Absorbs surges better by low dynamic resistance and low clamp voltage
  • Zener voltage lineups of wide range : VZ (typ.)=5.6 V to 36 V

Applications

  • Consumer equipment (home appliances, OA equipment, power supplies, etc.)
  • Industrial equipment (power supplies, etc.)

Product Specifications

(@Ta=25 °C)

 

Part
number
Package Absolute maximum ratings Zener
voltage
VZ
(V)
Clamp
voltage
VC[5][6]
typ.
(V)
Dynamic
resistance
RDYN[5]
typ.
(O)
Name Size
typ.
(mm)
Electrostatic
discharge
voltage
VESD[2]
(kV)
Peak
pulse
current
IPP[1]
(A)
Power
dissipation
PD[4]
(mW)
Contact Air min typ. max Test
current
IZ
(mA)
CUHZ5V6 SOD-323HE
(US2H)
2.5 ×
1.4 ×
0.6
±30 91 1200 5.3 5.6 6.0 10 5.7 0.02
CUHZ6V2 87 5.8 6.2 6.6 6.1 0.02
CUHZ6V8 73 6.4 6.8 7.2 7.2 0.014
CUHZ8V2 68 7.7 8.2 8.7 8.5 0.035
CUHZ12V 60 11.4 12 12.6 13.6 0.13
CUHZ16V 42 15.3 16 17.1 17 0.085
CUHZ20V 36 18.8 20 21.2 20.6 0.13
CUHZ24V 27 22.8 24 25.6 25.5 0.14
CUHZ30V 26 28.0 30 32.0 33.8 0.21
CUHZ36V 23 34.0 36 38.0 9 41.2 0.39

 

Notes :
[4] Mounted on a glass epoxy circuit board of 25.4 mm × 25.4 mm × 1.6 mm, Cu pad : 645 mm2
[5] TLP parameters : Z0=50 Ω, tp=100 ns, tr=300 ps, averaging window : t1=30 ns to t2=60 ns,
extraction of dynamic resistance using least squares fit of TLP characteristics between ITLP1=16 A and ITLP2=30 A.
[6] ITLP=16 A

Pin Assignment

The illustration of pin assignment of Lineup Expansion of Zener Diodes for Power Line Protection Contributing to Improvement of Equipment Reliability

Application Circuit Examples

The illustration of application circuit examples of Lineup Expansion of Zener Diodes for Power Line Protection Contributing to Improvement of Equipment Reliability
 

The application circuits shown in this document are provided for reference purposes only. Thorough evaluation is required, especially at the mass-production design stage.
Providing these application circuit examples does not grant any license for industrial property rights.

Characteristic figures (reference)[7]

The illustration of characteristic figures (reference)[7] of Lineup Expansion of Zener Diodes for Power Line Protection Contributing to Improvement of Equipment Reliability
The illustration of characteristic figures (reference)[7] of Lineup Expansion of Zener Diodes for Power Line Protection Contributing to Improvement of Equipment Reliability

Notes :
[7] As of January 2022, values measured by Toshiba
[8] @Ta=25 °C, TLP parameters : Z0=50 Ω, tp=100 ns, tr=300 ps, averaging window : t1=30 ns to t2=60 ns


Information in this press release, including product pricing and specifications, content of services and contact information, is current and believed to be accurate on the date of the announcement, but is subject to change without prior notice. Technical and application information contained here is subject to the most recent applicable Toshiba product specifications.