Diodes Incorporated MMBZ5226BS-7-F

Overview

MMBZ5226BS-7-F from Diodes Incorporated is a dual isolated 3.3 V Zener diode pair in SOT-363 package, rated for 200 mW power dissipation, 28 Ω zener impedance at 20 mA, and 25 μA reverse leakage at 1.0 V reverse bias. It provides precision voltage reference and overvoltage clamping in space-constrained analog signal conditioning circuits.

For engineers reviewing the MMBZ5226BS-7-F datasheet, MMBZ5226BS-7-F pinout, MMBZ5226BS-7-F application, or MMBZ5226BS-7-F equivalent, key selection criteria include nominal zener voltage tolerance (±3.5%), thermal resistance (625 °C/W), dual-diode isolation integrity, and SOT-363 footprint compatibility with high-density PCB layouts.

Technical Context

This device integrates two electrically isolated Zener diodes on a single planar silicon die, enabling bidirectional voltage regulation or independent reference generation within one ultra-small surface-mount package. Each diode exhibits tightly controlled breakdown characteristics: 3.3 V nominal V_Z with ±3.5% tolerance, 28 Ω dynamic impedance at I_ZT = 20 mA, and guaranteed low leakage ≤25 μA at V_R = 1.0 V.

Thermal performance is defined by R_θJA = 625 °C/W on FR4 board with recommended pad layout, supporting operation across –65 °C to +150 °C ambient. The SOT-363 package uses matte tin-plated Alloy 42 leads and UL 94V-0 mold compound, meeting RoHS and Diodes Inc.'s "Green" policy requirements.

Key Specifications

Pinout & Package

SOT-363 (SC-70-6) package: 1.9 mm × 1.3 mm × 0.9 mm body, six-terminal leadframe with dual-anode/dual-cathode configuration. Molded plastic case meets UL 94V-0 flammability rating and J-STD-020D Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C3V3-7-F and MMBZ5226B-7-F, MMBZ5226BS-7-F uniquely delivers two isolated 3.3 V Zeners in one SOT-363 footprint-reducing component count, eliminating matching variance, and enabling compact bidirectional protection or dual-reference designs not possible with single-diode alternatives.

Availability

MMBZ5226BS-7-F is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset supervision, industrial sensor signal conditioning, and automotive body control module voltage reference applications requiring stable component supply and RoHS-compliant sourcing.

Supply support for MMBZ5226BS-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, specializing in high-reliability components for automotive, industrial, and consumer markets with emphasis on efficiency, miniaturization, and regulatory compliance.

The MMBZ52xxBS series belongs to Diodes Inc.'s precision Zener diode portfolio, engineered specifically for space-constrained, dual-function voltage reference and clamping applications where isolation, low leakage, and tight tolerance are critical.

FAQ

What is the maximum continuous power dissipation for MMBZ5226BS-7-F at 25°C ambient?

The device is rated for 200 mW continuous power dissipation at T_A = 25°C when mounted on an FR4 PCB with Diodes Inc.'s recommended pad layout. Derating begins linearly above 25°C at 0.32 mW/°C, reaching zero dissipation at 150°C ambient per the published power derating curve.

How are the two Zener diodes arranged internally in the SOT-363 package?

The MMBZ5226BS-7-F contains two fully isolated Zener diodes fabricated on a single planar silicon die. Terminals C1/A1 form Diode 1; C2/A2 form Diode 2; the two remaining pins are unconnected (NC) and must remain floating. No internal connection exists between the diodes' anodes or cathodes.

Can MMBZ5226BS-7-F be used for bidirectional ESD protection on a single data line?

Yes - connecting C1 and A2 together as the protected node, with A1 grounded and C2 tied to V_CC, creates a symmetrical ±3.3 V clamping structure. This configuration leverages both Zeners to clamp positive and negative transients relative to the local rail, validated per IEC 61000-4-2 testing guidelines.

Is the marking code "KG1" sufficient to identify MMBZ5226BS-7-F on the physical device?

Yes - "KG1" is the official marking code printed on the top surface of the SOT-363 package per Diodes Inc.'s documentation. It uniquely identifies the 3.3 V variant within the MMBZ5221BS–MMBZ5259BS family and corresponds directly to the type number MMBZ5226BS in the ordering matrix.