Diodes Incorporated MMSZ5240B-7-F

Overview

MMSZ5240B-7-F from Diodes Incorporated is a 10 V, ±5% tolerance, 500 mW surface-mount Zener diode in SOD-123 package, rated for 20 mA test current and 17 Ω dynamic impedance at 1 kHz, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the MMSZ5240B-7-F datasheet, MMSZ5240B-7-F pinout, MMSZ5240B-7-F application, or MMSZ5240B-7-F equivalent, key selection criteria include zener voltage accuracy (9.5–10.5 V), low leakage (<3 µA at 8 V), thermal stability (±0.08%/°C tempco), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across load variations and supply fluctuations. It delivers regulated output with 17 Ω impedance at 20 mA and exhibits <3 µA reverse leakage at 80% of nominal zener voltage.

Designed for operation at +25°C ambient, its power dissipation derates linearly above +75°C case temperature, with R_θJA = 338°C/W on FR-4 PCB and R_θJL = 132°C/W under lead temperature conditions.

Key Specifications

Pinout & Package

SOD-123 surface-mount package with cathode band marking; two-terminal device with anode and cathode leads formed in gull-wing configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C10 and MMBZ5240BS, MMSZ5240B-7-F offers higher power handling (500 mW vs. 300 mW) and lower dynamic impedance (17 Ω vs. ≥20 Ω), making it preferable for sustained regulation loads and noise-sensitive references.

Availability

MMSZ5240B-7-F is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor signal conditioning, and medical diagnostic equipment requiring stable component supply and AEC-Q101 compliance.

Supply support for MMSZ5240B-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.

MMSZ5240B-7-F belongs to the MMSZ52xxB series of general-purpose Zener diodes engineered for medium-current voltage regulation and reference applications in cost-sensitive, high-volume designs.

FAQ

What is the maximum reverse leakage current for MMSZ5240B-7-F at 8 V?

The maximum reverse leakage current is 3.0 µA at V_R = 8.0 V and T_A = +25°C, as specified in the Electrical Characteristics table. This value remains stable across industrial temperature ranges and supports low-power biasing in always-on circuits.

Is MMSZ5240B-7-F suitable for automotive applications?

Yes - it is qualified to AEC-Q101 standards and rated for operation from –65°C to +150°C. Its green, halogen-free construction and lead-free plating meet automotive manufacturing and environmental compliance requirements.

How does the SOD-123 package affect thermal performance?

Mounted on FR-4 with 1-inch copper pad, the SOD-123 achieves R_θJA = 338°C/W. Derating begins at +75°C case temperature, allowing full 500 mW dissipation up to that point - critical for thermally dense PCB layouts.

Can MMSZ5240B-7-F replace older MMSZ5240B variants?

Yes - the "-7-F" suffix denotes 3,000-piece tape-and-reel packaging with lead-free plating and green compound. Electrically identical to earlier versions, it maintains full compatibility in both schematic and layout design.