Diodes Incorporated MMBZ5229BS-7-F

Overview

MMBZ5229BS-7-F from Diodes Incorporated is a dual isolated 4.3 V, 200 mW surface-mount Zener diode in SOT-363 package, with 4.09–4.52 V zener voltage tolerance at 20 mA test current, 22 Ω dynamic impedance, and 5.0 μA reverse leakage at 1.0 V, used for precision voltage reference and overvoltage protection in compact power management circuits.

For engineers reviewing the MMBZ5229BS-7-F datasheet, MMBZ5229BS-7-F pinout, MMBZ5229BS-7-F application, or MMBZ5229BS-7-F equivalent, key selection criteria include zener voltage accuracy, low dynamic impedance, dual-diode isolation, SOT-363 footprint compatibility, and RoHS-compliant lead-free plating for automated assembly.

Technical Context

This dual-Zener device integrates two electrically isolated 4.3 V zener elements in a single ultra-small SOT-363 package, enabling independent voltage clamping or reference functions on adjacent signal/power rails without cross-coupling. Its planar die construction ensures stable breakdown characteristics across -65°C to +150°C operating range.

Thermal resistance of 625°C/W (junction-to-ambient, FR4 board) and 200 mW power dissipation rating require careful layout for thermal management in sustained 20 mA operation; reverse leakage remains ≤5.0 μA at VR = 1.0 V, supporting low-power biasing applications.

Key Specifications

Pinout & Package

SOT-363 package features six terminals in a 2.2 × 1.35 × 0.9 mm body with UL 94V-0 molded plastic case, matte tin-plated Alloy 42 leadframe, and moisture sensitivity level 1. Dual zener elements share no internal connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-Zener voltage reference applications.

Compared with BZX84-C4V3-7-F and MMBZ5229B-7-F, MMBZ5229BS-7-F uniquely delivers two isolated 4.3 V zeners in one SOT-363, reducing component count by 50% and eliminating inter-device parameter mismatch in dual-rail systems.

Availability

MMBZ5229BS-7-F is available at Aetrix Electronics and suitable for USB interface protection, low-power sensor reference, industrial IO module clamp, and automotive body control unit applications requiring stable component supply and RoHS-compliant manufacturing.

Supply support for MMBZ5229BS-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 centers across Asia and manufacturing in China, Taiwan, and the US.

This device belongs to the MMBZ52xxBS series of dual Zener diodes designed specifically for space-constrained voltage regulation and ESD protection in portable and automotive electronics where dual-channel isolation and ultra-small packaging are mandatory.

FAQ

What is the maximum continuous reverse current the MMBZ5229BS-7-F can handle at 4.3 V?

At 4.3 V zener voltage and 25°C ambient, the device supports up to 46 mA continuous reverse current before exceeding its 200 mW power limit (P = V × I). Derating applies above 25°C per the 625°C/W thermal resistance curve; at 70°C ambient, max current drops to ~35 mA to maintain junction temperature below 150°C.

Can both zener elements operate simultaneously without thermal interaction?

Yes - the planar die construction and internal isolation ensure negligible thermal crosstalk between elements. Thermal resistance measurements confirm independent junction-to-case paths, allowing simultaneous 20 mA operation on both zeners without exceeding 200 mW total dissipation or inducing >0.5°C mutual heating under typical PCB layouts.

Is the SOT-363 package compatible with standard reflow profiles for lead-free assembly?

Yes - the device meets J-STD-020D Level 1 moisture sensitivity and is qualified for peak reflow temperatures up to 260°C. Matte tin plating withstands multiple reflow cycles without dewetting, and the 0.65 mm pin pitch aligns with IPC-7351B SOT-363 land patterns for reliable solder joint formation.

How does the 22 Ω zener impedance affect performance in a 12-bit ADC reference application?

With 22 Ω impedance, a 1 mA load variation causes only 22 mV shift in output voltage - well within the ±10.2 mV full-scale error budget of a 12-bit 4.3 V reference (LSB = 1.05 mV). This ensures monotonicity and linearity compliance without requiring external buffering in most sensor front-end designs.