Diodes Incorporated MMBZ5242BW-7-F

Overview

MMBZ5242BW-7-F from Diodes Incorporated is a 12 V, 200 mW surface-mount Zener diode in SOT323 package, with nominal Zener voltage 12.0 V (min 11.4 V, max 12.6 V), test current 20 mA, and maximum Zener impedance 30 Ω at I_ZT; used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces.

For engineers reviewing the MMBZ5242BW-7-F datasheet, MMBZ5242BW-7-F pinout, MMBZ5242BW-7-F application, or MMBZ5242BW-7-F equivalent, key selection criteria include Zener voltage tolerance (±5%), low leakage (<1.0 µA at 9.1 V), thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a reverse-biased voltage reference with sharp breakdown knee at 12 V, specified under 20 mA test current and 25 °C ambient. Its 30 Ω dynamic impedance at I_ZT ensures stable regulation across load variations, while 600 Ω impedance at 0.25 mA supports low-current biasing applications.

Designed for surface-mount assembly on FR4 PCBs using recommended pad layout AP02001, it delivers 200 mW power dissipation with derating above 25 °C per Fig. 1, and exhibits <1.0 µA reverse leakage at VR = 9.1 V - critical for battery-powered signal conditioning circuits.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small plastic surface-mount case (2.10 mm × 1.30 mm × 0.90 mm), lead-free matte tin terminals, moisture sensitivity level 1.

Key Features

Applications

Availability

MMBZ5242BW-7-F is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial analog input modules, portable medical monitoring, and smart home battery management requiring stable component supply and full traceability.

Supply support for MMBZ5242BW-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.

The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered for precision voltage regulation and transient suppression in space-constrained, thermally demanding applications.

FAQ

What is the maximum reverse leakage current for MMBZ5242BW-7-F?

The maximum reverse leakage current is 1.0 µA at VR = 9.1 V, measured at 25 °C ambient. This value is specified in the Electrical Characteristics table and reflects worst-case leakage under rated reverse voltage, critical for low-power system design where standby current must be minimized.

Is MMBZ5242BW-7-F compatible with lead-free reflow soldering processes?

Yes - it features matte tin finish annealed over Alloy 42 leadframe, fully compliant with lead-free soldering per J-STD-020D Level 1 moisture sensitivity, and qualified for peak reflow temperatures up to 260 °C. The SOT323 package is rated for standard Pb-free reflow profiles without delamination or plating degradation.

How does the 30 Ω Zener impedance affect regulation accuracy?

A 30 Ω impedance at 20 mA means a 1 mA change in Zener current causes ~30 mV output shift - directly impacting reference stability in precision analog circuits. This value is measured at 1 kHz and enables predictable error budgeting when designing feedback networks for op-amps or ADC references.

Can MMBZ5242BW-7-F replace MMBZ5241BW or MMBZ5243BW in existing designs?

Substitution requires verification: MMBZ5241BW (11 V) and MMBZ5243BW (13 V) differ by ±1 V nominal Zener voltage and exhibit different leakage (2.0 µA vs. 0.5 µA) and impedance (22 Ω vs. 13 Ω). Direct replacement may shift regulation point or alter transient response - redesign validation is required for functional equivalence.