MMBZ5259B-HE3-08

Single Zener Diodes Overview

The MMBZ5259B-HE3-08 is a silicon planar Zener diode manufactured by Vishay General Semiconductor. It features a nominal Zener voltage of 39 V with a tolerance of ±5%. The device is designed for surface mount applications in an SOT-23-3 package, offering a maximum power dissipation of 225 mW. Key electrical characteristics include a maximum reverse leakage current of 100 nA and a Zener impedance of 25 ohms. The component operates within a temperature range of -55°C to +150°C.

Single Zener Diodes Feature Summary

• Silicon planar construction providing excellent stability and low noise performance
• Low leakage current capability suitable for sensitive circuit applications
• RoHS compliant and lead-free manufacturing process

Single Zener Diodes Applications

• Voltage regulation in portable electronic devices
• Clamping and protection circuits in consumer electronics
• Reference voltage sources in measurement instrumentation

Single Zener Diodes Procurement Notes

This specific part number (MMBZ5259B-HE3-08) is officially listed as obsolete and no longer manufactured by Vishay. Procurement should focus on identifying verified replacement components from the same manufacturer or compatible alternatives from other suppliers. Verify that any substitute maintains the required SOT-23-3 footprint, 39 V Zener voltage, and 225 mW power rating to ensure functional equivalence in existing designs.

Single Zener Diodes Selection Notes

Designers requiring this component must account for its discontinued status. Selection should prioritize cross-referencing with active equivalents that match the 39 V nominal voltage and SOT-23-3 package dimensions. Ensure that the alternative device meets the original specifications for leakage current and thermal operating range. Validate pinout compatibility to prevent PCB redesign efforts when transitioning to a new supplier or updated part number.

Single Zener Diodes Part Context

The MMBZ5259B series belongs to Vishay's line of single Zener diodes optimized for surface mount technology. These devices are engineered for general-purpose voltage regulation and protection roles in compact electronic assemblies. The HE3 suffix indicates a halogen-free and RoHS-compliant variant, aligning with environmental standards for modern semiconductor production.

Single Zener Diodes Replacement Considerations

Verified substitutes include Diodes Incorporated MMBZ5259B-7-F. Confirm that the replacement matches the 39 V Zener voltage, 225 mW power dissipation, and SOT-23-3 package outline to ensure direct interchangeability without modifying the printed circuit board layout.

Single Zener Diodes FAQ

What is the maximum power dissipation of the MMBZ5259B-HE3-08?

The maximum power dissipation is 225 mW.

What is the Zener impedance specification for this device?

The Zener impedance is specified as 25 ohms.

Is the MMBZ5259B-HE3-08 currently in production?

No, this part number is obsolete and no longer manufactured.