Diodes Incorporated MMBZ5236BW-7

Overview

MMBZ5236BW-7 from Diodes Incorporated is a 7.5 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±5% tolerance (7.13–7.88 V), with 6 Ω dynamic impedance at 20 mA test current and ≤3.0 μA reverse leakage at 6.0 V. It provides precision voltage regulation in low-power biasing and reference circuits for automotive ECUs and industrial sensor signal conditioning.

For engineers reviewing the MMBZ5236BW-7 datasheet, MMBZ5236BW-7 pinout, MMBZ5236BW-7 application, or MMBZ5236BW-7 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (625 °C/W), AEC-Q101 qualification, lead-free/Green compliance, and SOT323 footprint compatibility with automated assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define safe operating limits on standard FR4 PCBs with recommended pad layout.

The device exhibits 6.0 Ω Zener impedance at 20 mA (f = 1 kHz), ensuring low AC voltage variation during regulation, and delivers ≤3.0 μA reverse leakage at VR = 6.0 V - critical for low-current reference stability in battery-powered systems.

Key Specifications

Pinout & Package

Package: SOT323 - ultra-small 3-pin surface-mount plastic case (2.10 mm × 1.30 mm × 0.90 mm), matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, weight ≈0.006 g.

Key Features

Applications

Availability

MMBZ5236BW-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference design, and IoT node voltage clamping requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for MMBZ5236BW-7 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.

This device belongs to the MMBZ52xxBW series of 200 mW Zener diodes engineered for space-constrained, high-reliability applications demanding AEC-Q101 qualification and green material compliance.

FAQ

What is the maximum reverse voltage before breakdown for MMBZ5236BW-7?

The nominal Zener voltage is 7.5 V with a guaranteed range of 7.13 V to 7.88 V at 20 mA test current. Breakdown occurs within this band; operation below 7.13 V yields negligible reverse current (≤3.0 μA at 6.0 V), confirming sharp knee characteristics essential for reliable regulation.

Can MMBZ5236BW-7 replace MMBZ5234BW-7 in a 6.2 V reference circuit?

No - MMBZ5236BW-7 has a nominal 7.5 V Zener voltage versus 6.2 V for MMBZ5234BW-7. Substituting would shift reference level by >20%, invalidating bias points and ADC scaling. Voltage-specific Zeners are not interchangeable without circuit recalibration.

Is the center pin (Pin 3) electrically functional in SOT323 package?

No - Pin 3 is an unconnected mechanical tie-bar with no internal semiconductor connection. It must remain floating or be left unsoldered; connecting it to ground or any net introduces risk of shorting or mechanical stress-induced failure.

How does thermal derating affect MMBZ5236BW-7's power handling above 25°C?

Per Figure 1, power dissipation linearly derates from 200 mW at 25°C to zero at 150°C, following a slope of -1.6 mW/°C. At 100°C ambient, max allowable power drops to 80 mW - requiring reduced Zener current or enhanced PCB copper area to avoid exceeding junction temperature limits.