Diodes Incorporated MMBZ5250BS-7

Overview

MMBZ5250BS-7 from Diodes Incorporated is a dual isolated 20 V Zener diode pair in SOT-363 package, rated for 200 mW total power dissipation, with 6.2 mA test current, 25 Ω zener impedance at 1 kHz, and reverse leakage ≤0.1 μA at 15 V, used for precision voltage reference and overvoltage clamping in space-constrained analog signal conditioning circuits.

For engineers reviewing the MMBZ5250BS-7 datasheet, MMBZ5250BS-7 pinout, MMBZ5250BS-7 application, or MMBZ5250BS-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), low leakage at VR = 15 V, 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 in a single ultra-small surface-mount package, enabling bidirectional voltage regulation or independent clamping on separate signal paths without cross-coupling. Each diode operates with a specified zener voltage of 20 V (19.0–21.0 V range) at 6.2 mA test current.

It uses planar die construction for stable breakdown characteristics and low dynamic impedance (25 Ω typical at I_ZT), with thermal performance defined for FR4 boards using Diodes Inc.'s recommended pad layout. Moisture sensitivity is Level 1 per J-STD-020D, supporting standard reflow profiles.

Key Specifications

Pinout & Package

SOT-363 package with six terminals: two anodes (A1, A2), two cathodes (C1, C2), and two no-connect (NC) pins. Molded plastic case meets UL 94V-0 flammability rating; terminals are matte tin-plated for solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C20LT1G and MMBZ5250B-7-F, MMBZ5250BS-7 uniquely delivers two isolated 20 V Zeners in a 6-pin SOT-363, enabling compact dual-path protection or reference generation where electrical separation is mandatory.

Availability

MMBZ5250BS-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection, low-power IoT voltage references, and automotive body control module input protection requiring stable component supply and consistent parametric performance.

Supply support for MMBZ5250BS-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, application-optimized components for industrial, computing, and consumer markets.

This device belongs to Diodes Inc.'s MMBZ52xxBS series of dual Zener diodes, designed specifically for space-constrained, dual-rail voltage regulation and bidirectional transient suppression in high-density PCB assemblies.

FAQ

What is the maximum reverse voltage (V_R) at which leakage current is guaranteed ≤0.1 μA?

The datasheet specifies that reverse leakage current I_R is ≤0.1 μA at V_R = 15 V for MMBZ5250BS-7. This value is measured under steady-state DC conditions at T_A = 25°C and defines the upper limit of usable reverse bias before significant leakage begins.

Can both Zener diodes be operated simultaneously at full 200 mW total power?

No. The 200 mW rating applies to the entire package as a thermal limit. Simultaneous full-power operation of both diodes would exceed junction temperature limits. Power must be distributed such that sum of dissipation in both elements remains ≤200 mW, with derating above 25°C ambient per Figure 1.

Are the two Zener diodes internally connected or fully isolated?

The two Zener diodes are fully electrically isolated - no internal substrate or metallization connects their anodes or cathodes. This is confirmed by the "dual isolated Zeners" feature statement and the separate A1/C1 and A2/C2 pin assignments with two NC terminals in the SOT-363 outline.

Does the "-7" suffix indicate tape-and-reel packaging, and what is the standard reel quantity?

Yes, the "-7" suffix denotes SOT-363 packaging on 3000-unit tape-and-reel per the Ordering Information section. The "-F" suffix (e.g., MMBZ5250BS-7-F) explicitly confirms this configuration, and Diodes Inc. document DS31039 Rev. 15-2 lists "3000/Tape & Reel" as the shipping quantity for all -7 variants.