Diodes Incorporated MMSZ5241B-7-F

Overview

MMSZ5241B-7-F from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 11V (10.45–11.55V range), 20mA test current, and 22Ω zener impedance at 1kHz. It features SOD123 packaging, cathode band polarity, and AEC-Q101 qualification for automotive reliability. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.

For engineers reviewing the MMSZ5241B-7-F datasheet, MMSZ5241B-7-F pinout, MMSZ5241B-7-F application, or MMSZ5241B-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (338°C/W), reverse leakage (≤2.0µA at 8.4V), and SOD123 footprint compatibility with automated PCB assembly.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage regulation under controlled current conditions. Its 11V nominal rating targets mid-range reference needs in power supply feedback loops and sensor biasing networks, where ±5% tolerance and low dynamic impedance are critical for accuracy.

The device exhibits a temperature coefficient of approximately +0.06%/°C near 11V (per Figure 6), indicating mild positive drift with temperature. Its 370mW ambient-rated power dissipation at 25°C and 500mW lead-temperature-rated dissipation require careful thermal layout on FR-4 PCBs with 1-inch copper pads.

Key Specifications

Pinout & Package

Package: SOD123 - molded plastic case with matte tin-plated alloy 42 leadframe, cathode band marking, and 0.01g mass. Dimensions: L=0.25–0.40mm, D=1.40–1.70mm, E=2.55–2.85mm, He=3.55–3.85mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C11LT1G and MMBZ5241BS-7-F, MMSZ5241B-7-F delivers higher power handling (370mW vs. 300mW) in the compact SOD123 footprint, making it optimal for cost-sensitive, medium-power voltage regulation where thermal pad area is available.

Availability

MMSZ5241B-7-F is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor signal conditioning, and consumer appliance voltage monitoring requiring stable component supply and AEC-Q101 compliance.

Supply support for MMSZ5241B-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 for cost-effective, reliable voltage regulation and protection in commercial and automotive applications with stringent environmental compliance requirements.

FAQ

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

The MMSZ5241B-7-F has a nominal zener voltage of 11V with a guaranteed range of 10.45V to 11.55V. Below the minimum breakdown voltage (10.45V), only negligible reverse leakage (≤2.0µA at 8.4V) flows. Continuous reverse bias below this threshold is safe and non-destructive, but regulation does not occur until breakdown begins.

How does the SOD123 package affect thermal performance compared to SOT-23?

The SOD123 package has a junction-to-ambient thermal resistance of 338°C/W on FR-4 with 1-inch copper, versus ~200°C/W for SOT-23 under identical conditions. This means the SOD123 requires larger copper areas or forced airflow to achieve equivalent temperature rise at 370mW dissipation, especially above 75°C ambient.

Is MMSZ5241B-7-F suitable for use in a 12V automotive battery monitoring circuit?

Yes - its 11V zener voltage provides headroom below typical 12V nominal (13.8V running, up to 16V load dump) systems. With appropriate series current limiting (e.g., 1kΩ resistor), it clamps transients while maintaining ≤2.0µA leakage at 8.4V, avoiding false triggers in monitoring comparators.

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

Yes - the "-7-F" suffix denotes 3,000-piece tape-and-reel packaging and full RoHS 2 compliance (2011/65/EU), including lead-free plating, halogen-free molding compound, and antimony-free construction per Diodes Incorporated's Green definition (<900ppm Br, <900ppm Cl, <1000ppm Sb).