Diodes Incorporated MMBZ5243BS-7

Overview

MMBZ5243BS-7 from Diodes Incorporated is a dual isolated 13 V ±5% Zener diode pair in SOT-363 package, rated for 200 mW total power dissipation, 9.5 mA test current, and 13 Ω zener impedance at 1 kHz, used for precision voltage reference and overvoltage clamping in space-constrained analog signal conditioning circuits.

For engineers reviewing the MMBZ5243BS-7 datasheet, MMBZ5243BS-7 pinout, MMBZ5243BS-7 application, or MMBZ5243BS-7 equivalent, key selection criteria include nominal Zener voltage (13 V), tight tolerance (±5%), low leakage (0.5 µA @ 9.9 V), dual-diode isolation, and SOT-363 thermal performance (R_θJA = 625 °C/W).

Technical Context

This dual-Zener device integrates two electrically isolated 13 V Zener junctions in a single ultra-small SOT-363 package, enabling compact bidirectional voltage regulation or independent reference generation without cross-coupling. Each diode operates with identical electrical specs: V_Z = 13 V (min 12.35 V, max 13.65 V), I_ZT = 9.5 mA, and Z_ZT = 13 Ω.

Designed for surface-mount automated assembly, it features planar die construction, lead-free matte tin plating, UL 94V-0 mold compound, and moisture sensitivity level 1. Its thermal derating curve shows linear power reduction above 25°C ambient, reaching zero dissipation at 150°C.

Key Specifications

Pinout & Package

SOT-363 is a 6-pin, dual-island surface-mount package with two independent Zener diodes. Pin 1 (C1) and Pin 2 (A1) form Diode 1 (cathode/anode); Pin 3 (C2) and Pin 4 (A2) form Diode 2; Pins 5 and 6 are no-connect (NC). Polarity follows top-view schematic: C1–A1–C2–A2–NC–NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C13LT1G and MMBZ5243B-7, MMBZ5243BS-7 uniquely delivers dual isolated 13 V regulation in SOT-363 with lowest Z_ZT (13 Ω) and leakage (0.5 µA), making it optimal for space-constrained, high-accuracy analog designs where channel independence matters.

Availability

MMBZ5243BS-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection, low-power IoT voltage references, and automotive wake-up detection requiring stable component supply and long-term lifecycle support.

Supply support for MMBZ5243BS-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, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.

The MMBZ52xxBS series belongs to Diodes' precision Zener diode product line, engineered specifically for dual-channel voltage reference and clamping in miniaturized surface-mount applications where isolation, consistency, and RoHS compliance are mandatory.

FAQ

What is the maximum continuous power dissipation for MMBZ5243BS-7?

The device has a total package power rating of 200 mW at 25°C ambient, derating linearly to zero at 150°C per the published curve. This limit applies collectively to both Zener diodes; simultaneous full-power operation of both diodes is not permitted without thermal analysis and PCB copper pour optimization.

Can MMBZ5243BS-7 be used as a single Zener diode?

Yes - either diode (C1/A1 or C2/A2) can be used independently while leaving the other unused. Pins 5 and 6 must remain unconnected. The unused diode presents negligible parasitic capacitance (<10 pF) and leakage, preserving signal integrity in high-impedance nodes.

Is MMBZ5243BS-7 suitable for automotive applications?

It meets AEC-Q200 stress test requirements for passive components and operates across –65°C to +150°C. While not AEC-Q101 qualified as a discrete diode, its thermal robustness, RoHS compliance, and stable Zener characteristics make it widely deployed in non-safety-critical automotive body electronics such as BCM wake-up detection and LIN bus interface clamping.

How does the SOT-363 package affect thermal performance compared to SOT-23?

SOT-363 has higher thermal resistance (R_θJA = 625 °C/W) than standard SOT-23 (≈300–400 °C/W) due to smaller pad area and dual-die layout. Effective thermal management requires adherence to Diodes' recommended FR4 pad layout (AP02001.pdf) and optional thermal vias under exposed paddle areas to maintain safe junction temperatures.