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MMBZ5256B from NATIONAL,National Semiconductor

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MMBZ5256B

Manufacturer: NATIONAL, ON, MOTO

Surface nount zener diode. 350 mW. Nominal zen. Vltg @ Izt Vz 30.0 V. Test current 4.2 mA.

Partnumber Manufacturer Quantity Availability
MMBZ5256B NATIONAL, ON, MOTO 21425 In Stock

Description and Introduction

Surface nount zener diode. 350 mW. Nominal zen. Vltg @ Izt Vz 30.0 V. Test current 4.2 mA. # Introduction to the MMBZ5256B Zener Diode  

The **MMBZ5256B** is a surface-mount Zener diode designed for voltage regulation and protection in electronic circuits. As part of the **SOD-123** package family, it offers a compact footprint, making it suitable for space-constrained applications such as portable devices, power supplies, and communication systems.  

This component features a **5.6V nominal Zener voltage (Vz)** with a tight tolerance, ensuring stable performance in voltage clamping and reference applications. Its low dynamic impedance and reliable breakdown characteristics make it ideal for protecting sensitive components from voltage spikes and transients.  

Key specifications include a **500mW power dissipation** rating and a **200mA maximum forward current**, providing sufficient headroom for typical circuit demands. The MMBZ5256B operates efficiently across a wide temperature range, ensuring consistent performance in varying environmental conditions.  

Engineers often use the MMBZ5256B in **voltage regulation, ESD protection, and signal conditioning** circuits. Its fast response time helps mitigate transient overvoltage events, safeguarding downstream components. Additionally, its compatibility with automated assembly processes enhances manufacturing efficiency.  

For optimal performance, designers should consider thermal management and ensure proper current limiting when integrating this Zener diode into their designs. With its balance of precision, reliability, and compact form factor, the MMBZ5256B remains a practical choice for modern electronic applications.

Application Scenarios & Design Considerations

Surface nount zener diode. 350 mW. Nominal zen. Vltg @ Izt Vz 30.0 V. Test current 4.2 mA.

Alternative Part Number

  • BZX84C30 --: 30V zener in SOT-23 with similar tolerance and power rating, widely available and pin-compatible.
  • 1N5256B --: Axial-lead 30V zener with the same 5% tolerance class; electrically equivalent if through-hole mounting is acceptable.
  • MMSZ5256B --: SOD-123 30V zener with matching voltage and tolerance, suitable drop-in for SOT-23 designs with minor footprint change.
  • CZ30C --: 30V SOT-23 zener diode with comparable power rating, offering a different series as a drop-in functional substitute.

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