EMZT6.8ET2R

Overview

The ROHM Semiconductor EMZT6.8ET2R is a low capacitance Zener diode featuring a quad common anode configuration within an EMD5 (SOT-553) surface-mount package. It provides a typical Zener voltage of 6.8 V with a tolerance range of 6.47 V to 7.14 V at a test current of 5 mA. The device supports a maximum power dissipation of 150 mW and operates at junction temperatures up to 150 °C. Key electrical parameters include a maximum reverse leakage current of 500 nA and a Zener impedance of 40 Ohms. The component measures 1.6 x 1.6 mm with a height of 0.55 mm, designed for compact circuit layouts.

Feature Summary

• Quad common anode architecture integrates four independent Zener elements into a single compact package.
• Low capacitance design minimizes signal distortion in high-speed data line protection applications.
• Ultra-small plastic molding construction enables efficient space utilization on dense printed circuit boards.

Applications

• High-speed data bus transient voltage suppression
• ESD protection for portable electronic interfaces
• Voltage reference circuits requiring multiple channels

Procurement Notes

Verify the specific ordering suffix to ensure correct packaging format, as variations exist between tape-and-reel and cut-tape options. Confirm RoHS compliance status through official documentation prior to integration. Check supply status carefully, as certain variants may be designated for existing customers only and not recommended for new designs. Ensure storage conditions remain within the specified temperature range to maintain component integrity.

Selection Notes

Select this component when multi-channel voltage clamping is required in minimal footprint designs. The quad configuration reduces board space compared to using discrete single diodes. Verify that the 150 mW power rating suffices for the expected thermal environment. Consider the 40 Ohm impedance value for high-frequency signal integrity requirements. Ensure the SOT-553 package dimensions align with the target PCB land pattern.

Part Context

This part belongs to ROHM's EMZT6.8E series of low capacitance Zener diodes. The series emphasizes miniaturization and reliability for modern consumer electronics. The EMZT6.8ET2R specifically utilizes the EMD5 package code, distinguishing it from other series members like the UMZ or VMZ lines which offer different pin counts or configurations.

Replacement Considerations

The TDZV6.8 offers a similar Zener voltage but differs in package type (SOD-323HE) and configuration (single). The CDZCV6.8B is listed as a replacement for related parts but features a unidirectional setup and smaller SOD-923 package. Verify pinout compatibility and power dissipation limits before substituting.