Diodes Incorporated MMBZ5231BW-7-F

Overview

MMBZ5231BW-7-F from Diodes Incorporated is a 5.1 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±5% zener voltage tolerance at 20 mA test current, with 17 Ω maximum zener impedance and 5.0 μA reverse leakage at 2.0 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the MMBZ5231BW-7-F datasheet, MMBZ5231BW-7-F pinout, MMBZ5231BW-7-F application, or MMBZ5231BW-7-F equivalent, key selection criteria include zener voltage accuracy, thermal resistance (625 °C/W), AEC-Q101 qualification, lead-free/Green compliance, and SOT323 footprint compatibility in space-constrained PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. It delivers 5.1 V nominal regulation with tight 4.85–5.36 V range at 20 mA, and exhibits low dynamic impedance (17 Ω @ 1 kHz) for minimal output variation during transient current changes.

Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and features halogen/antimony-free "Green" molding compound (UL 94V-0), matte tin-plated terminals, and moisture sensitivity level 1 - enabling robust performance in industrial and automotive control modules without derating.

Key Specifications

Pinout & Package

Package: SOT323 - 3-terminal surface-mount plastic case (2.10 × 1.30 × 0.90 mm), polarity marked by cathode band, compatible with automated pick-and-place and reflow soldering.

Key Features

Applications

Availability

MMBZ5231BW-7-F is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and portable medical power monitoring requiring stable component supply, consistent parametric performance, and long-term lifecycle assurance.

Supply support for MMBZ5231BW-7-F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets.

The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage reference and transient suppression in harsh-environment electronics.

FAQ

What is the maximum power dissipation of MMBZ5231BW-7-F at 100°C ambient?

At 100°C ambient, the device's power dissipation must be derated linearly from 200 mW at 25°C using the 625 °C/W thermal resistance. The allowable power is 200 mW × (1 − (100 − 25)/625) = 176 mW - verified per Figure 1 derating curve in DS31037 Rev. 14-2.

Is MMBZ5231BW-7-F pin-compatible with other SOT323 Zener diodes?

Yes - all SOT323-packaged Zeners share identical mechanical footprint and terminal arrangement. However, electrical compatibility depends on zener voltage, impedance, and leakage; MMBZ5231BW-7-F is not interchangeable with 3.3 V or 12 V variants without circuit redesign.

Does this part require special handling for moisture sensitivity?

No - MMBZ5231BW-7-F is rated Moisture Sensitivity Level 1 per J-STD-020D, meaning it may be stored indefinitely at ≤30°C/60% RH and assembled directly from dry pack without baking or floor-life tracking.

Can MMBZ5231BW-7-F be used in place of a 5.0 V Zener diode?

Only if system-level tolerance allows ±2% deviation: MMBZ5231BW-7-F is specified at 5.1 V nominal (4.85–5.36 V). For strict 5.0 V applications, MMBZ5230BW (4.7 V) or MMBZ5232BW (5.6 V) are adjacent options - but no 5.0 V variant exists in this series.