Diodes Incorporated MMSZ5233BQ-7-F

Overview

MMSZ5233BQ-7-F from Diodes Incorporated is an AEC-Q101 qualified 6.0 V ±5% Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 7 Ω zener impedance at 20 mA test current and 5.0 µA reverse leakage at 3.5 V. It serves as a precision voltage reference or overvoltage clamp in automotive power rail monitoring circuits.

For engineers reviewing the MMSZ5233BQ-7-F datasheet, MMSZ5233BQ-7-F pinout, MMSZ5233BQ-7-F application, or MMSZ5233BQ-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (338 °C/W), automotive qualification status, SOD123 footprint compatibility, and low leakage performance at sub-zener bias.

Technical Context

This device operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its 6.0 V nominal zener voltage exhibits a temperature coefficient of approximately +0.04 %/°C per Figure 6, enabling predictable drift behavior in ambient temperature ranges from –65°C to +150°C.

The SOD123 package supports automated placement and reflow soldering, with matte tin-plated alloy 42 leads and UL 94V-0 molding compound. Thermal derating follows a linear curve from 500 mW at TL = +75°C to zero at +150°C junction temperature.

Key Specifications

Pinout & Package

Package: SOD123 surface-mount plastic case with cathode band marking; dimensions: 1.55 mm width × 2.65 mm length × 1.05 mm height; weight ≈ 0.01 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C6V2 and 1N4735A, MMSZ5233BQ-7-F offers automotive qualification, SOD123 surface-mount compatibility, and optimal balance of 6.0 V regulation accuracy, 370 mW power handling, and ultra-low leakage-making it preferred for production-grade automotive and industrial PCBs.

Availability

MMSZ5233BQ-7-F is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, consumer port protection, and medical diagnostic equipment requiring stable component supply and AEC-Q101 compliance.

Supply support for MMSZ5233BQ-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.

MMSZ5233BQ-7-F belongs to the MMSZ52xxB automotive Zener diode family, engineered specifically for reliable voltage regulation and transient suppression in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage that can be continuously applied without breakdown?

The device begins controlled breakdown at its nominal zener voltage of 6.0 V. Applying reverse voltage below the minimum specified zener voltage (5.70 V) results in only leakage current ≤5.0 µA at 3.5 V. Sustained reverse bias above 6.30 V risks exceeding power limits unless current is strictly limited by external series resistance.

Is MMSZ5233BQ-7-F compatible with lead-free reflow soldering profiles?

Yes. The SOD123 package uses matte tin finish over alloy 42 leadframe and is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020, including peak temperatures up to 260°C. Moisture sensitivity level is Level 1, eliminating bake requirements prior to assembly.

How does temperature affect the zener voltage stability?

Per Figure 6 in DS18010 Rev. 28, MMSZ5233B exhibits a positive temperature coefficient of approximately +0.04 %/°C near 6.0 V. This means zener voltage increases by ~2.4 mV/°C over the –65°C to +150°C range, enabling predictable compensation in temperature-critical references.

Can this diode replace a 6.2 V Zener in existing designs?

Only if the system tolerates a 0.2 V lower clamping threshold and accounts for tighter 5.70–6.30 V tolerance versus typical 6.2 V parts. The 6.0 V rating reduces margin against overvoltage but improves undervoltage detection sensitivity; verify worst-case regulation under max load and temperature before substitution.