Diodes Incorporated MMSZ5232B-7-F

Overview

MMSZ5232B-7-F from Diodes Incorporated is a 5.6 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current with 11 Ω dynamic impedance at 1 kHz and 5 µA reverse leakage at 3.0 V. It delivers stable voltage reference and overvoltage protection in low-power analog rails and power supply feedback loops.

For engineers reviewing the MMSZ5232B-7-F datasheet, MMSZ5232B-7-F pinout, MMSZ5232B-7-F application, or MMSZ5232B-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (338 °C/W), AEC-Q101 qualification, and SOD123 footprint compatibility with automated PCB assembly.

Technical Context

This Zener diode operates in reverse breakdown to maintain a precise 5.6 V reference across load variations and temperature shifts. Its 11 Ω zener impedance at 20 mA ensures minimal voltage deviation under dynamic current conditions, while the −0.04 %/°C temperature coefficient (typical for 5.6 V devices in this series) supports stable regulation from −65 °C to +150 °C.

Designed for medium-current general-purpose clamping and regulation, it features a cathode band polarity marker, matte tin-plated alloy 42 leads, and green molding compound compliant with UL 94V-0 and RoHS directives. Power derating begins at +75 °C ambient, with full 500 mW dissipation only at lead temperature ≤75 °C.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); weight ≈ 0.01 g; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C5V6 and 1N4734A, MMSZ5232B-7-F uniquely balances automotive qualification, SMD manufacturability, and 500 mW capability in a 2.65 mm × 1.55 mm footprint-making it optimal for production-grade embedded systems where reliability, size, and assembly scalability are jointly critical.

Availability

MMSZ5232B-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and portable medical diagnostics requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MMSZ5232B-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 and manufacturing operations across Asia and the Americas.

The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for cost-sensitive, high-volume applications demanding AEC-Q101 reliability, RoHS compliance, and seamless SMT integration.

FAQ

What is the maximum reverse voltage (V_R) that MMSZ5232B-7-F can block before breakdown?

The device exhibits 5 µA reverse leakage at V_R = 3.0 V, and its nominal zener voltage is 5.6 V. Breakdown occurs sharply between 5.32 V and 5.88 V at 20 mA test current. It is not rated for blocking voltages above 5.88 V in sustained operation-exceeding this risks thermal runaway unless current is strictly limited by external series resistance.

Can MMSZ5232B-7-F be used in place of a 5.1 V Zener like MMSZ5231B in an existing design?

No-direct substitution alters the regulation point by +0.5 V, potentially overbiasing downstream components. If redesign is possible, verify that all connected circuitry tolerates 5.6 V instead of 5.1 V, especially in feedback networks or comparator thresholds. The 11 Ω impedance is lower than MMSZ5231B's 17 Ω, improving load regulation but not compensating for the voltage shift.

Does the "-7-F" suffix indicate tape-and-reel packaging and RoHS compliance?

Yes: "-7-F" denotes 3,000-unit tape-and-reel packaging with fully RoHS-compliant, lead-free, halogen-free, and antimony-free construction. The "F" explicitly confirms Green compound compliance per Diodes' definitions, and the part meets J-STD-020 moisture sensitivity Level 1 for standard reflow processing without baking.

How does thermal derating affect usable power at 105 °C ambient temperature?

At T_A = 105 °C, the device must be derated per Figure 1: usable power drops to ~250 mW. This assumes standard FR-4 PCB layout with 1-inch copper pad. For reliable 370 mW operation, junction temperature must stay ≤150 °C-requiring either reduced ambient, enhanced copper area, or forced airflow to maintain R_θJA ≤ 338 °C/W.