Diodes Incorporated MMBZ5250BW-7-F

Overview

MMBZ5250BW-7-F from Diodes Incorporated is a 20 V, 200 mW surface-mount Zener diode in SOT323 package, with nominal zener voltage 20 V (19.0–21.0 V), test current 6.2 mA, dynamic impedance 25 Ω at 1 kHz, and reverse leakage ≤0.1 μA at 15 V, used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces.

For engineers reviewing the MMBZ5250BW-7-F datasheet, MMBZ5250BW-7-F pinout, MMBZ5250BW-7-F application, or MMBZ5250BW-7-F equivalent, key selection criteria include zener tolerance (±5%), low leakage at rated VR, thermal resistance (625 °C/W), AEC-Q101 qualification, and compatibility with automated SMT assembly on FR4 PCBs.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. It features a 20 V nominal zener voltage with ±5% tolerance, 25 Ω dynamic impedance at 6.2 mA test current, and guaranteed leakage ≤0.1 μA at 15 V - enabling accurate clamping in signal conditioning paths.

Designed for high-reliability applications, it meets AEC-Q101 stress testing requirements and uses halogen- and antimony-free "Green" molding compound (UL 94V-0). Its SOT323 package supports fine-pitch placement and delivers 200 mW power dissipation with 625 °C/W junction-to-ambient thermal resistance on standard FR4 layout.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small plastic surface-mount case (2.10 × 1.30 × 0.90 mm), matte tin-plated terminals, polarity indicated by cathode band on top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B20,115 and MMBZ5250BS-7-F, MMBZ5250BW-7-F offers the lowest leakage (0.1 μA) and tightest thermal resistance control in SOT323, making it optimal for precision low-power regulation where parametric drift must be minimized.

Availability

MMBZ5250BW-7-F is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial analog input modules, medical wearable battery monitors, and smart meter voltage references requiring stable component supply and AEC-Q101-compliant sourcing.

Supply support for MMBZ5250BW-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, manufacturing, and sales operations across Asia, Europe, and North America.

The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and transient suppression in automotive, industrial, and medical systems where reliability and environmental compliance are critical.

FAQ

What is the maximum reverse voltage (V_R) at which leakage remains ≤0.1 μA?

The datasheet specifies that reverse leakage I_R ≤ 0.1 μA is guaranteed at V_R = 15 V. At V_R = 19 V, leakage rises to ≤1.0 μA; no guarantee is provided above 15 V for the 0.1 μA threshold. This defines the usable clamping window before significant conduction begins.

Can MMBZ5250BW-7-F be used in place of a 24 V Zener like MMBZ5252BW?

No - MMBZ5250BW-7-F has a nominal 20 V zener voltage (19.0–21.0 V), while MMBZ5252BW is rated 24 V (22.8–25.2 V). Substituting alters regulation setpoint by ~20%, risking overvoltage damage or undervoltage malfunction. Always match nominal V_Z and tolerance bands.

Is the SOT323 package lead-free and RoHS compliant?

Yes - the device uses matte tin finish over Alloy 42 leadframe, contains no purposely added lead, and is fully compliant with EU Directive 2011/65/EU (RoHS 2). It also meets halogen- and antimony-free "Green" definitions (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb).

How does thermal derating affect power handling at 100 °C ambient?

Per Figure 1, power dissipation must be linearly derated above 25 °C. At T_A = 100 °C, derating is (100 − 25) × (200 mW / 625 °C) = 24 mW. So maximum safe continuous power is 200 mW − 176 mW = 24 mW - confirming strict thermal management is required in hot environments.