Diodes Incorporated MMBZ5240BW-7-F

Overview

MMBZ5240BW-7-F from Diodes Incorporated is a 10 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±5% tolerance (9.5–10.5 V), with 17 Ω dynamic impedance at 20 mA test current and 3.0 μA max reverse leakage at 8.0 V. It provides precision voltage regulation in low-power biasing and reference circuits for industrial sensor interfaces and automotive control modules.

For engineers reviewing the MMBZ5240BW-7-F datasheet, MMBZ5240BW-7-F pinout, MMBZ5240BW-7-F application, or MMBZ5240BW-7-F equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (625 °C/W), RoHS/Green compliance, AEC-Q101 qualification, and SOT323 footprint compatibility with automated assembly.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp or regulate voltage at its nominal Zener voltage. Its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define safe operating limits under continuous DC or low-duty-cycle pulse conditions on standard FR4 PCBs.

The diode exhibits 17 Ω Zener impedance at I_ZT = 20 mA and maintains ≤3.0 μA reverse leakage at V_R = 8.0 V, enabling stable reference performance in low-current analog signal conditioning and microcontroller reset supervision circuits.

Key Specifications

Pinout & Package

Package: SOT323 - three-terminal plastic case with anode (pin 1), cathode (pin 2), and no internal connection at pin 3 (dummy lead). Dimensions: 2.10 mm × 1.30 mm × 0.90 mm (L × W × H); weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C10LT1G and MMSZ5240ET1G, MMBZ5240BW-7-F uniquely combines AEC-Q101 qualification, SOT323 miniaturization, and 200 mW power in a Green/RoHS-compliant construction-making it optimal for space-constrained automotive and industrial modules requiring certified reliability.

Availability

MMBZ5240BW-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive control units, and consumer power supply feedback circuits requiring stable component supply and long-term lifecycle support.

Supply support for MMBZ5240BW-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The MMBZ52xxBW series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage regulation, reference, and protection in space-constrained, high-reliability applications including automotive, industrial, and computing systems.

FAQ

What is the maximum continuous reverse voltage that MMBZ5240BW-7-F can withstand without breakdown?

The device is rated for nominal Zener breakdown at 10.0 V, with a guaranteed range of 9.5–10.5 V. It is not designed to block voltage above its Zener voltage in normal operation; sustained reverse voltage >10.5 V will cause conduction and power dissipation limited by its 200 mW rating and thermal environment.

Does MMBZ5240BW-7-F require a series current-limiting resistor in all applications?

Yes - a series resistor is mandatory to limit Zener current within the 200 mW power limit and prevent thermal runaway. For example, at 12 V supply and 10 V Zener voltage, a minimum 100 Ω resistor limits current to 20 mA, dissipating 40 mW in the resistor and 200 mW in the diode at full load.

How does the SOT323 package affect thermal performance compared to SOT23?

The SOT323's smaller pad area and reduced copper exposure result in higher thermal resistance (625 °C/W vs ~300–400 °C/W for SOT23), requiring stricter ambient temperature control or derating above +25°C. Its compact size trades thermal margin for board-space savings in high-density layouts.

Is MMBZ5240BW-7-F suitable for use in medical devices?

No - while AEC-Q101 qualified for automotive use, it lacks ISO 13485 manufacturing certification or specific medical-grade qualification (e.g., ISO 14971 risk management). Diodes Incorporated explicitly prohibits use in life support devices without CEO approval, and this part is not designated for such applications.