Diodes Incorporated MMBZ5250BS-7-F

Overview

MMBZ5250BS-7-F from Diodes Incorporated is a dual isolated 20 V Zener diode pair in SOT-363 package, rated for 200 mW power dissipation, 6.2 mA test current, and 25 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 MMBZ5250BS-7-F datasheet, MMBZ5250BS-7-F pinout, MMBZ5250BS-7-F application, or MMBZ5250BS-7-F equivalent, key selection criteria include nominal zener voltage tolerance (±5%), low leakage (<0.1 µA at 15 V), thermal resistance (625 °C/W), and dual-diode isolation for bidirectional protection or dual-rail referencing.

Technical Context

This device integrates two electrically isolated Zener diodes in a single ultra-small SOT-363 surface-mount package, enabling compact dual-voltage regulation or symmetrical transient suppression without shared cathode/anode paths. Each diode operates independently with identical 20 V nominal breakdown and matched thermal characteristics.

Designed for automated assembly on FR4 PCBs using recommended pad layout, it supports lead-free reflow per J-STD-020D Level 1 moisture sensitivity and delivers stable regulation across –65 °C to +150 °C operating temperature range with minimal self-heating under 200 mW continuous dissipation.

Key Specifications

Pinout & Package

SOT-363 package: 6-pin, dual-isolated Zener configuration with common anode/cathode separation. Molded plastic case (UL 94V-0), matte tin-plated Alloy 42 leadframe, weight ≈ 0.006 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C20LT1G and PDZ20B,115, MMBZ5250BS-7-F uniquely delivers dual isolated 20 V regulation in one SOT-363 footprint, enabling compact bidirectional clamping or matched dual-rail referencing without performance trade-offs in leakage or impedance.

Availability

MMBZ5250BS-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port ESD clamp, and automotive body control module applications requiring stable component supply and RoHS-compliant sourcing.

Supply support for MMBZ5250BS-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 industrial, automotive, and computing markets.

This part belongs to the MMBZ52xxBS series of dual Zener diodes designed specifically for space-constrained voltage regulation and bidirectional transient suppression in high-density PCB layouts.

FAQ

What is the maximum continuous reverse voltage this device can withstand before breakdown?

The MMBZ5250BS-7-F has a nominal Zener voltage of 20 V with a guaranteed range of 19.0–21.0 V at 6.2 mA test current. It begins controlled breakdown at approximately 19 V and maintains regulation up to its 200 mW power limit. Sustained reverse voltage below 19 V results in negligible leakage (<0.1 µA).

Can both Zener diodes be used simultaneously without interference?

Yes - the two Zener diodes are fully electrically isolated within the SOT-363 package. There is no internal connection between A1/C1 and A2/C2. Each diode operates independently, enabling simultaneous use for dual-rail referencing or bidirectional clamping without crosstalk or shared thermal effects.

Is this device suitable for IEC 61000-4-2 ESD protection?

Yes - with 200 mW power rating, 25 Ω dynamic impedance, and sub-nanosecond response, MMBZ5250BS-7-F is commonly deployed as a secondary ESD clamp in USB, CAN, and sensor interfaces. It complements primary TVS arrays by handling lower-energy discharges with tighter voltage control than standard TVS diodes.

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

The SOT-363's 6-pin construction increases thermal resistance to 625 °C/W versus ~400 °C/W for typical SOT-23 Zeners due to smaller die attach area and longer thermal path. This requires conservative derating above 25 °C ambient but enables dual-diode integration without doubling footprint area.