500mW Ultra-Low Bias Current Zener Diodes

June 11, 2024
Taiwan Semiconductor's series of Zener diodes offer regulated voltages from 1.8 to 39V DC, all with ultra-low bias current (IZT) of 50 µA and maximum power dissipation of 500 mW.

A new series of Zener diodes offer a selection of devices providing regulated voltages from 1.8 to 39V DC, all with ultra-low bias current (IZT) of 50 µA and maximum power dissipation (PD) of 500 mW.

These devices are ideal for applications where exceptionally low bias current is needed (to extend battery life), essential (for energy harvesting), or desirable (in lighting and IIoT) while still providing uncompromised Zener regulation.

The 39 individual diodes in the series with part numbers ranging from MMSZ4668 to MMSZ41716 are all packaged in an industry-standard, low-profile, SOD-123 surface-mount package. With their low IZT, these devices are a straightforward upgrade to existing designs (without the need for PCB modifications), as well as for new designs.


  • Specified at a low-test current (50 μA)
  • Tolerance approximately: ± 5%
  • Wide working voltage range VZ: 1.8 to 39 V
  • Packages: SOD-123


  • General-purpose Zener drop-in upgrade
  • Low-current general regulation functions
  • Portable applications
  • Industrial devices
  • Lighting systems
  • Energy harvesting

Price: Starting at $0.002 (depending on device and quantity)

Distributor info: Available from Digikey and Mouser

Samples: In-stock

Production Quantities: 16 weeks (ARO)

  Marking Code Zener Voltage VZ@IZT Test Current IZT Leakage Current IR@VR
Min. Nom. Max.
MMSZ4678 CC 1.71V 1.8V 1.89V 50 μA 7.5 μA 1V
MMSZ4679 CD 1.9V 2V 2.1V 50 μA 5 μA 1V
MMSZ4680 CE 2.09V 2.2V 2.31V 50 μA 4 μA 1V
MMSZ4681 CF 2.28V 2.4V 2.52V 50 μA 2 μA 1V
MMSZ4682 CH 2.565V 2.7V 2.835V 50 μA 1 μA 1V
MMSZ4683 CJ 2.85V 3V 3.15V 50 μA 0.8 μA 1V
MMSZ4684 CK 3.135V 3.3V 3.465V 50 μA 7.5 μA 1.5V
MMSZ4685 CM 3.42V 3.6V 3.78V 50 μA 7.5 μA 2V
MMSZ4686 CN 3.705V 3.9V 4.095V 50 μA 5 μA 2V
MMSZ4687 CP 4.085V 4.3V 4.515V 50 μA 4 μA 2V
MMSZ4688 CT 4.465V 4.7V 4.935V 50 μA 10 μA 3V
MMSZ4689 CU 4.845V 5.1V 5.355V 50 μA 10 μA 3V
MMSZ4690 CV 5.32V 5.6V 5.88V 50 μA 10 μA 4V
MMSZ4691 CA 5.89V 6.2V 6.51V 50 μA 10 μA 5V
MMSZ4692 CX 6.46V 6.8V 7.14V 50 μA 10 μA 5.1V
MMSZ4693 CY 7.125V 7.5V 7.875V 50 μA 10 μA 5.7V
MMSZ4694 CZ 7.79V 8.2V 8.61V 50 μA 1 μA 6.2V
MMSZ4695 DC 8.265V 8.7V 9.135V 50 μA 1 μA 6.6V
MMSZ4696 DD 8.645V 9.1V 9.555V 50 μA 1 μA 6.9V
MMSZ4697 DE 9.5V 10V 10.5V 50 μA 1 μA 7.6V
MMSZ4698 DF 10.45V 11V 11.55V 50 μA 1 μA 8.4V
MMSZ4699 DH 11.4V 12V 12.6V 50 μA 1 μA 9.1V
MMSZ4700 DJ 12.35V 13V 13.65V 50 μA 1 μA 9.8V
MMSZ4701 DK 13.3V 14V 14.7V 50 μA 1 μA 10.6V
MMSZ4702 DM 14.25V 15V 15.75V 50 μA 1 μA 11.4V
MMSZ4703 DN 15.2V 16V 16.8V 50 μA 1 μA 12.1V
MMSZ4704 DP 16.15V 17V 17.85V 50 μA 1 μA 12.9V
MMSZ4705 DT 17.1V 18V 18.9V 50 μA 1 μA 13.6V
MMSZ4706 DU 18.05V 19V 19.95V 50 μA 1 μA 14.4V
MMSZ4707 DV 19V 20V 21V 50 μA 0.01 μA 15.2V
MMSZ4708 DA 20.9V 22V 23.1V 50 μA 0.01 μA 16.7V
MMSZ4709 DX 22.8V 24V 25.2V 50 μA 0.01 μA 18.2V
MMSZ4710 DY 23.75V 25V 26.25V 50 μA 0.01 μA 19V
MMSZ4711 EA 25.65V 27V 28.35V 50 μA 0.01 μA 20.4V
MMSZ4712 EC 26.6V 28V 29.4V 50 μA 0.01 μA 21.2V
MMSZ4713 ED 28.5V 30V 31.5V 50 μA 0.01 μA 22.8V
MMSZ4714 EE 31.35V 33V 34.65V 50 μA 0.01 μA 25V
MMSZ4715 EF 34.2V 36V 37.8V 50 μA 0.01 μA 27.3V
MMSZ4716 EH 37.05V 39V 40.95V 50 μA 0.01 μA 29.6V

Taiwan Semiconductor (TSC)
Brea, CA
(657) 258-8000
[email protected]

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