MMBZ5249B

Single Zener Diodes Overview

The MMBZ5249B is a single Zener diode manufactured by Fairchild Semiconductor, housed in an SOT-23 surface-mount package. It features a nominal Zener voltage of 25 V with a tolerance of ±5%. The device has a maximum power dissipation of 300 mW and a maximum reverse leakage current of 100 nA at 19 V. Its dynamic impedance is specified at 35 Ohms, with a forward voltage of 900 mV at 10 mA. Operating temperatures range from -55 °C to +150 °C.

Single Zener Diodes Feature Summary

• Provides stable voltage regulation within the SOT-23 surface-mount form factor for space-constrained designs.
• Ensures low leakage current performance suitable for sensitive circuit protection applications.
• Supports automated board assembly processes due to standardized small outline packaging.

Single Zener Diodes Applications

• Voltage reference circuits requiring precise shunt regulation
• Over-voltage protection stages in portable electronic devices
• Clamping applications in high-density printed circuit boards

Single Zener Diodes Procurement Notes

Verify the manufacturer designation on the component marking, as Fairchild Semiconductor products are now distributed under the ON Semiconductor brand following corporate acquisition. Confirm RoHS compliance status and specific lot traceability requirements against current supply chain documentation before finalizing procurement orders.

Single Zener Diodes Selection Notes

Select this component when a 25 V regulation point is required in a compact SOT-23 footprint. Ensure the application current does not exceed limits that would cause power dissipation beyond the 300 mW rating. Verify thermal management capabilities if operating near the upper temperature limit of 150 °C.

Single Zener Diodes Part Context

This part belongs to the MMBZ52 series of Zener diodes designed for surface-mount technology. The series offers various voltage options within a consistent physical package, facilitating design standardization across different product lines while maintaining reliable voltage regulation characteristics for consumer and industrial electronics.

Single Zener Diodes Replacement Considerations

Equivalent parts include Vishay's MMSZ5249B-G3-18, which shares the 19 V specification but differs in package (SOD-123) and power rating (500 mW). Cross-reference electrical parameters carefully, as voltage ratings and package dimensions vary significantly between manufacturers.