ZM4742A

Single Zener Diodes Overview

The ZM4742A is a surface-mount silicon planar power Zener diode manufactured by Taiwan Semiconductor Corporation. It belongs to the ZM4728A–ZM4758A series, offering a nominal Zener voltage of 12 V with a standard tolerance of ±5%. The device operates within a junction temperature range of -65 °C to +175 °C and features a maximum power dissipation of 1 W. Packaged in a hermetically sealed glass MELF case (JEDEC DO-213AB), it utilizes matte tin-plated leads for solderability. Electrical characteristics include a test current of 21 mA, a regular impedance of 9 Ω at IZT, and a leakage current of 5 µA at VR.

Single Zener Diodes Feature Summary

• Hermetically sealed glass construction providing corrosion resistance
• Surface mount MELF package design compatible with JEDEC standards
• Matte tin plated terminals ensuring reliable solderability

Single Zener Diodes Applications

• Low voltage stabilizers
• Voltage references
• Adapters
• On-board DC/DC converters

Single Zener Diodes Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging details. Confirm that the requested variant matches the required voltage tolerance and thermal specifications. Ensure compliance with RoHS directives if applicable to the target market. Cross-reference the part number with the latest datasheet version to validate any potential specification updates or revisions before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a surface-mount solution is required for low-voltage regulation tasks. The MELF package offers a compact footprint suitable for space-constrained printed circuit board layouts. Verify that the operating environment remains within the specified junction temperature limits. Consider the 1 W power dissipation rating to ensure adequate thermal management is implemented in the final assembly design.

Single Zener Diodes Part Context

This component is part of the ZM4728A through ZM4758A series from Taiwan Semiconductor. The series covers a wide Zener voltage range from 3.3 V to 56 V. All devices in this family share identical mechanical data and package dimensions, differing primarily in their nominal Zener voltage and associated electrical parameters such as test current and impedance.

Single Zener Diodes Replacement Considerations

Cross-reference with other manufacturers' MELF Zener diodes rated for 12 V and 1 W. Verify compatibility regarding package dimensions, polarity marking, and thermal resistance values. Ensure substitute parts meet the same hermetic sealing and lead plating requirements.