Diodes Incorporated MMBZ5221BS-7-F

Overview

MMBZ5221BS-7-F from Diodes Incorporated is a dual isolated 2.4 V ±5% Zener diode pair in SOT-363 package, rated for 200 mW power dissipation, 30 Ω zener impedance at 20 mA, and 100 μA reverse leakage at 1.0 V, used for precision voltage reference and overvoltage clamping in space-constrained analog signal conditioning circuits.

For engineers reviewing the MMBZ5221BS-7-F datasheet, MMBZ5221BS-7-F pinout, MMBZ5221BS-7-F application, or MMBZ5221BS-7-F equivalent, key selection criteria include nominal zener voltage tolerance (±5%), low thermal resistance (625 °C/W), dual-diode isolation, RoHS-compliant matte tin plating, and compatibility with automated SMT assembly on FR4 PCBs.

Technical Context

This dual Zener device integrates two electrically isolated 2.4 V zener junctions in a single ultra-small SOT-363 package, enabling compact dual-rail voltage regulation or bidirectional transient suppression without cross-coupling. Each diode operates independently with identical electrical specs: 20 mA test current, 30 Ω dynamic impedance, and 1200 Ω knee impedance at 0.25 mA.

It is optimized for low-power analog subsystems where board area is constrained and thermal management relies on PCB copper layout per AP02001 guidelines. The device exhibits stable breakdown behavior across -65°C to +150°C ambient, with derating beginning above 25°C per the published power curve.

Key Specifications

Pinout & Package

SOT-363 is a 6-pin ultra-small outline transistor package with dual isolated die, molded in UL 94V-0 plastic, moisture sensitivity level 1, and matte tin-plated Alloy 42 leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C2V4LT1G and MMBZ5221B-7-F, the MMBZ5221BS-7-F uniquely delivers two isolated 2.4 V Zeners in one SOT-363 footprint-reducing component count by 50% and eliminating inter-device parameter mismatch in matched-reference designs.

Availability

MMBZ5221BS-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB interface protection, low-power IoT voltage reference, and automotive body control module input protection requiring stable component supply and full traceability.

Supply support for MMBZ5221BS-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 U.S.

This device belongs to the MMBZ52xxBS dual Zener series, designed specifically for high-density analog and mixed-signal PCBs where dual matched voltage references or symmetrical clamping must coexist within minimal board area.

FAQ

What is the maximum reverse voltage before breakdown for MMBZ5221BS-7-F?

The nominal zener voltage is 2.4 V with a guaranteed range of 2.28 V to 2.52 V at 20 mA test current. Breakdown occurs sharply within this band; operation below 1.0 V reverse bias yields ≤100 μA leakage, per datasheet Figure 2 and Electrical Characteristics table.

Can both Zeners be used simultaneously without interference?

Yes-C1/A1 and C2/A2 form two fully isolated junctions with no internal connection. Cross-talk is negligible (<0.1 pF coupling per Figure 4), and thermal interaction is minimized by shared die construction with independent thermal paths to the leadframe.

Is MMBZ5221BS-7-F compatible with lead-free reflow profiles?

Yes-it uses matte tin plating over Alloy 42 and is qualified for standard Pb-free reflow (J-STD-020D Level 1). Peak temperature tolerance is 260°C, and no pre-bake is required due to its moisture sensitivity level 1 rating.

How does derating affect power handling above 25°C ambient?

Per Figure 1, power dissipation linearly derates from 200 mW at 25°C to zero at 150°C. At 85°C ambient, max power drops to 120 mW. This requires adjusting series resistor values or limiting pulse duty cycle in thermally constrained layouts.