Diodes Incorporated MMBZ5234BW-7

Overview

MMBZ5234BW-7 from Diodes Incorporated is a 6.2 V, 200 mW surface-mount Zener diode in SOT323 package, rated for 20 mA test current with 7.0 Ω zener impedance at 20 mA and 5.0 μA reverse leakage at 4.0 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the MMBZ5234BW-7 datasheet, MMBZ5234BW-7 pinout, MMBZ5234BW-7 application, or MMBZ5234BW-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), thermal resistance (625 °C/W), AEC-Q101 qualification, lead-free/Green compliance, and SOT323 footprint compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. It delivers 6.2 V nominal regulation with ±5% tolerance (5.89–6.51 V) at 20 mA test current and exhibits low dynamic impedance (7.0 Ω at 20 mA, 1000 Ω at 0.25 mA) for effective noise suppression.

Designed for high-reliability applications, it meets AEC-Q101 stress testing requirements and features a halogen/antimony-free green molding compound (UL 94V-0), matte tin-plated terminals, and moisture sensitivity level 1 - enabling robust performance across automotive and industrial environments without derating.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small plastic surface-mount case with three terminals; anode and cathode pins aligned linearly, center pin unused (NC) or internally unconnected; total weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with BZX84-C6V2 and MMBZ5234BS, MMBZ5234BW-7 offers optimal balance of AEC-Q101 qualification, Green compliance, and SOT323 compactness - making it preferred for automotive ECUs and space-limited industrial controllers where reliability and footprint are jointly critical.

Availability

MMBZ5234BW-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and portable medical diagnostics requiring stable component supply and AEC-Q101 assurance.

Supply support for MMBZ5234BW-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage reference, overvoltage protection, and biasing in automotive and industrial control systems demanding high reliability and environmental compliance.

FAQ

What is the maximum reverse voltage this Zener can withstand before breakdown?

The MMBZ5234BW-7 has a nominal zener voltage of 6.2 V with a guaranteed range of 5.89 V to 6.51 V at 20 mA test current. Its reverse breakdown is sharp and well-defined within this band; operation below 5.89 V yields negligible reverse current (<5 μA at 4.0 V), and exceeding 6.51 V initiates controlled conduction. It is not rated for sustained operation above its specified zener voltage range.

Is this part suitable for use in automotive applications?

Yes - the MMBZ5234BW-7 is explicitly qualified to AEC-Q101 standards, covering temperature cycling, high-temperature reverse bias, and ESD testing. Its operating temperature range (−65°C to +150°C), halogen-free construction, and SOT323 packaging make it approved for under-hood and cabin electronics including body control modules and sensor interfaces.

How does the SOT323 package affect thermal performance?

The SOT323 package provides a junction-to-ambient thermal resistance of 625 °C/W on standard FR4 PCB with Diodes' recommended pad layout (AP02001). This means a 200 mW dissipation causes ~125°C junction rise above ambient - limiting continuous use to ≤25°C ambient unless derated. For higher ambient, power must be reduced per the derating curve in Figure 1 of DS31037.

Can this Zener replace older through-hole Zeners like 1N4735A?

No - while both regulate near 6.2 V, the 1N4735A is a 1 W, DO-41 device with vastly different thermal mass, impedance (10 Ω vs. 7 Ω), and package. MMBZ5234BW-7 is optimized for low-power, surface-mount applications; substituting it for 1N4735A in high-current or surge-prone circuits risks thermal runaway or inadequate clamping. Use only where power and footprint match the SOT323 specification.