MMBZ5231BS-7

Overview

The MMBZ5231BS-7 is a dual isolated Zener diode manufactured by Diodes Incorporated, housed in an SOT-363 surface-mount package. It features planar die construction and provides two independent voltage regulation channels within a single ultra-small footprint. The nominal Zener voltage for the KE1 marking code is 5.1V, with a tolerance range of 4.85V to 5.36V at a test current of 0.25mA. Maximum power dissipation is rated at 200mW, supported by a thermal resistance of 625°C/W. Electrical specifications include a maximum Zener impedance of 17Ω at 0.25mA and a maximum reverse leakage current of 5.0μA at 2.0V reverse bias. The device operates within a temperature range of -65°C to +150°C.

Feature Summary

• Dual isolated Zener configuration allows independent voltage regulation within a compact SOT-363 package.
• Planar die construction ensures robust performance suitable for automated assembly processes.
• Lead-free and RoHS compliant manufacturing with UL 94V-0 flammability rating.

Applications

• Voltage reference circuits requiring dual independent rails
• Clamping and protection for low-voltage signal lines
• Biasing networks in portable electronic devices

Procurement Notes

Verify the specific ordering suffix against official Diodes Incorporated documentation to confirm packaging details. The standard suffix indicates tape and reel shipping quantities. Ensure compatibility with existing PCB pad layouts defined in application notes. Confirm date codes meet project requirements regarding green molding compound usage if halogen-free status is critical for the supply chain.

Selection Notes

Select this component when space constraints necessitate dual Zener functions in a single surface-mount package. The SOT-363 form factor offers significant board area savings compared to discrete single-channel alternatives. Verify that the 200mW power dissipation rating aligns with the expected thermal environment and duty cycle of the target application circuit.

Part Context

This part belongs to the MMBZ5221BS through MMBZ5259BS series, which covers a wide range of Zener voltages from 2.4V to 39V. All variants share identical mechanical dimensions and electrical testing conditions, differing primarily in breakdown voltage characteristics and marking codes. The series is designed for general-purpose voltage regulation tasks in consumer electronics.

Replacement Considerations

Direct substitutes must match the SOT-363 package and dual-isolated topology. Verify equivalent Zener voltage tolerances and impedance values. Cross-reference with other manufacturers offering dual Zener arrays in SC-88 or similar small outline packages to ensure pinout compatibility and thermal performance alignment.

FAQ

What is the marking code for the MMBZ5231BS?

The product type marking code for the MMBZ5231BS is KE1.

How is the dual isolation achieved in this package?

The device utilizes planar die construction to provide two electrically isolated Zener junctions within the SOT-363 case, allowing independent operation of each channel.

What is the maximum reverse leakage current specified?

The maximum reverse leakage current is 5.0μA, measured at a reverse voltage of 2.0V.