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MMBZ5257B from MOTO,Motorola

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MMBZ5257B

Manufacturer: MOTO, FAIRCHILD

Surface nount zener diode. 350 mW. Nominal zen. Vltg @ Izt Vz 33.0 V. Test current 3.8 mA.

Partnumber Manufacturer Quantity Availability
MMBZ5257B MOTO, FAIRCHILD 28640 In Stock

Description and Introduction

Surface nount zener diode. 350 mW. Nominal zen. Vltg @ Izt Vz 33.0 V. Test current 3.8 mA. **Introduction to the MMBZ5257B Zener Diode**  

The MMBZ5257B is a high-performance surface-mount Zener diode designed for voltage regulation and protection in electronic circuits. As part of the small-signal diode family, it offers precise voltage clamping, making it suitable for applications requiring stable reference voltages or transient suppression.  

With a nominal Zener voltage of **15V** and a compact SOT-23 package, the MMBZ5257B is ideal for space-constrained designs in consumer electronics, automotive systems, and industrial controls. Its low leakage current and sharp breakdown characteristics ensure reliable performance in both forward and reverse bias conditions.  

Key features include a **500mW power dissipation rating** and tight voltage tolerance, enabling consistent operation across varying temperatures and load conditions. The diode’s fast response time also makes it effective for protecting sensitive components from voltage spikes and electrostatic discharge (ESD).  

Engineers often integrate the MMBZ5257B into power supplies, voltage regulators, and signal conditioning circuits where precision and durability are critical. Its compatibility with automated assembly processes further enhances its appeal for high-volume manufacturing.  

For optimal performance, designers should adhere to recommended operating conditions, including proper heat dissipation and current limits. When used correctly, the MMBZ5257B provides a cost-effective, reliable solution for maintaining circuit stability in demanding environments.  

By balancing efficiency with robustness, this Zener diode remains a versatile choice for modern electronic designs.

Application Scenarios & Design Considerations

Surface nount zener diode. 350 mW. Nominal zen. Vltg @ Izt Vz 33.0 V. Test current 3.8 mA.

Alternative Part Number

  • BZX84C33 --: 33V zener in SOT-23 with similar power rating, widely available and a common cross for MMBZ5257B.
  • MMSZ5257B --: Same 33V zener voltage and SOD-123 package, electrically equivalent and easy drop-in for many designs.
  • 1N5257B --: Axial-leaded 33V zener with identical voltage tolerance, suitable when through-hole mounting is acceptable.

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