Diodes Incorporated MMSZ5225BQ-7-F

Overview

MMSZ5225BQ-7-F from Diodes Incorporated is an automotive-grade 3.0 V, 500 mW surface-mount Zener diode in SOD123 package, rated for 20 mA test current, 1.6 kΩ maximum Zener impedance at 1 kHz, and 50 µA maximum reverse leakage at 1.0 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the MMSZ5225BQ-7-F datasheet, MMSZ5225BQ-7-F pinout, MMSZ5225BQ-7-F application, or MMSZ5225BQ-7-F equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (338 °C/W), AEC-Q101 qualification, lead-free green packaging, and SOD123 footprint compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown to maintain a stable 3.0 V reference across varying load and temperature conditions. Its 20 mA test current and 1.6 kΩ dynamic impedance ensure predictable regulation in low-current bias networks and feedback paths.

Designed for automotive environments, it meets AEC-Q101 stress requirements and features a cathode band polarity marker, matte tin-plated Alloy 42 leadframe, and UL 94V-0 molded plastic case - all supporting high-reliability operation from –65 °C to +150 °C.

Key Specifications

Pinout & Package

Package: SOD123 - surface-mount, two-terminal plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × D × A); weight ≈ 0.01 g.

Key Features

Applications

Availability

MMSZ5225BQ-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference design, and USB port protection requiring stable component supply with full AEC-Q101 traceability and green compliance.

Supply support for MMSZ5225BQ-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The MMSZ52xxB series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for stable voltage reference and transient suppression in harsh-environment electronics where AEC-Q101 reliability and green compliance are mandatory.

FAQ

What is the Zener voltage tolerance for MMSZ5225BQ-7-F?

The MMSZ5225BQ-7-F has a nominal Zener voltage of 3.0 V with a guaranteed range of 2.85 V to 3.15 V at 20 mA test current, corresponding to ±5% tolerance. This is specified in the Electrical Characteristics table of DS18010 Rev. 28–2 and applies under standard test conditions (T_A = +25 °C).

How does the SOD123 package affect thermal performance?

In the SOD123 package, MMSZ5225BQ-7-F achieves a junction-to-ambient thermal resistance of 338 °C/W when mounted on an FR-4 PCB with a 1-inch copper pad. This value assumes standard JEDEC layout; reducing pad area or omitting thermal vias increases R_θJA, limiting safe continuous power dissipation.

Is MMSZ5225BQ-7-F suitable for use in non-automotive applications?

Yes - while qualified to AEC-Q101, the device's electrical and thermal specifications (e.g., 3.0 V Zener, 370 mW rating, –65 °C to +150 °C range) are fully applicable in commercial and industrial designs. The "Q" suffix denotes automotive qualification but does not restrict usage; non-Q variants (e.g., MMSZ5225B-7-F) share identical silicon.

What is the maximum reverse leakage current at 1.0 V?

The maximum reverse leakage current for MMSZ5225BQ-7-F is 50 µA at V_R = 1.0 V and T_A = +25 °C, as stated in the Electrical Characteristics table. This parameter ensures minimal quiescent current draw in voltage-reference divider networks and clamping circuits operating near turn-on threshold.