Diodes Incorporated MMBZ5230BS-7

Overview

MMBZ5230BS-7 from Diodes Incorporated is a dual isolated 4.7 V Zener diode pair in SOT-363 package, rated for 200 mW total power dissipation, 19 Ω zener impedance at 20 mA test current, and 5.0 μA reverse leakage at 2.0 V reverse voltage. It provides precision voltage reference and overvoltage clamping in space-constrained analog signal conditioning and power rail protection circuits.

For engineers reviewing the MMBZ5230BS-7 datasheet, MMBZ5230BS-7 pinout, MMBZ5230BS-7 application, or MMBZ5230BS-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), low dynamic impedance, dual-diode isolation, SOT-363 thermal performance (625 °C/W RθJA), and RoHS-compliant matte tin plating.

Technical Context

This dual Zener device integrates two electrically isolated 4.7 V zener junctions in a single ultra-small surface-mount package. Each diode operates independently with identical electrical specs: 4.47–4.94 V zener voltage range at 20 mA, 19 Ω dynamic impedance, and 5.0 μA leakage at VR = 2.0 V.

Designed for automated assembly on FR4 PCBs using recommended pad layout, it delivers stable regulation under transient conditions with 625 °C/W junction-to-ambient thermal resistance and full operation across –65 °C to +150 °C ambient temperature range.

Key Specifications

Pinout & Package

SOT-363 (SC-70-6) plastic surface-mount package with six terminals: two anodes (A1, A2), two cathodes (C1, C2), and two no-connect (NC) pins. Molded UL 94V-0 case enables high-density routing on compact PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C4V7LT1G and MMBZ5230B-7-F, MMBZ5230BS-7 uniquely delivers dual isolated 4.7 V regulation in the smallest possible footprint (SOT-363), enabling compact differential protection schemes where channel separation and thermal efficiency are critical.

Availability

MMBZ5230BS-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection circuits, low-power IoT node references, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for MMBZ5230BS-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 and manufacturing operations across Asia and the Americas.

The MMBZ52xxBS series belongs to Diodes' precision Zener diode product line, engineered specifically for high-density, low-power voltage regulation and transient suppression in portable and automotive electronics.

FAQ

What is the maximum continuous reverse current the MMBZ5230BS-7 can handle without degradation?

The device is rated for 20 mA test current (I_ZT) and supports continuous operation up to this level when ambient temperature remains ≤25 °C and PCB thermal design maintains junction temperature below 150 °C. Derating follows the published curve: 200 mW linearly reduces to zero at 150 °C ambient.

Can both Zener diodes in the MMBZ5230BS-7 be used simultaneously in the same circuit?

Yes - the two Zeners are fully electrically isolated, allowing concurrent use for bidirectional clamping (e.g., D+ and D− lines) or independent voltage references (e.g., analog and digital rails). No shared current path or thermal coupling exists between them.

Is the MMBZ5230BS-7 suitable for automotive AEC-Q200 qualification?

No - while it operates across –65 °C to +150 °C, the MMBZ5230BS-7 is not AEC-Q200 qualified. For automotive-grade applications, Diodes offers the AZ series (e.g., AZMMBZ5230BS-7) with full stress testing and PPAP documentation.

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

The SOT-363's smaller size increases thermal resistance to 625 °C/W versus ~350 °C/W for typical SOT-23 Zeners. This requires tighter attention to copper pour area and via placement under the exposed pad region to avoid exceeding 150 °C junction temperature at full 200 mW dissipation.