Diodes Incorporated MMBZ5237BS-7-F

Overview

MMBZ5237BS-7-F from Diodes Incorporated is a dual isolated 8.2 V, 200 mW surface-mount Zener diode in SOT-363 package, with nominal zener voltage 8.2 V (min 7.79 V, max 8.61 V), test current 20 mA, dynamic impedance 8 Ω at I_ZT, and reverse leakage ≤3.0 μA at 6.5 V. It provides precision voltage regulation in compact power management circuits for portable instrumentation and low-power sensor interfaces.

For engineers reviewing the MMBZ5237BS-7-F datasheet, MMBZ5237BS-7-F pinout, MMBZ5237BS-7-F application, or MMBZ5237BS-7-F equivalent, key selection criteria include zener voltage tolerance (±5%), low dynamic impedance at 20 mA, thermal resistance (625 °C/W), dual-diode isolation, and RoHS-compliant SOT-363 packaging for high-density PCB layouts.

Technical Context

This dual-Zener device integrates two electrically isolated 8.2 V zener junctions in a single SOT-363 package, enabling independent voltage reference or clamping paths without shared substrate coupling. Its planar die construction ensures stable breakdown characteristics across -65 °C to +150 °C operating range.

The device operates with 20 mA test current and exhibits 8 Ω zener impedance at I_ZT, 500 Ω at knee current (0.25 mA), and ≤3.0 μA reverse leakage at 6.5 V - confirming suitability for low-current biasing and precision threshold detection where minimal parasitic conduction is required.

Key Specifications

Pinout & Package

SOT-363 package with six terminals: two isolated Zener diode structures (C1/A1 and C2/A2), plus two no-connect (NC) pins. Molded plastic case meets UL 94V-0 flammability rating; moisture sensitivity level 1 per J-STD-020D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C8V2LT1G and MMBZ5237B-7-F, MMBZ5237BS-7-F uniquely delivers dual isolated 8.2 V references in the smallest standardized footprint (SOT-363), enabling compact dual-rail monitoring or redundancy without sacrificing thermal performance or leakage control.

Availability

MMBZ5237BS-7-F is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference generation, ESD-protected IO clamping, and microcontroller reset supervision requiring stable component supply across industrial and consumer production programs.

Supply support for MMBZ5237BS-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 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 reference and clamping applications in portable and battery-operated systems.

FAQ

What is the maximum allowable junction temperature for MMBZ5237BS-7-F?

The absolute maximum junction temperature is +150 °C, consistent with its operating and storage temperature range of -65 to +150 °C. At 200 mW dissipation and 625 °C/W thermal resistance, junction temperature rises 125 °C above ambient - so maximum safe ambient is +25 °C for full-rated operation unless heatsinking or airflow is applied.

Can MMBZ5237BS-7-F be used in avalanche mode for noise generation?

No - this device is specified and characterized only for controlled zener breakdown operation at 20 mA. Its 8.2 V nominal voltage falls within the zener-dominated region (<6 V) and transition region (6–8 V); avalanche behavior is neither guaranteed nor tested. Diodes Incorporated does not characterize or warrant noise spectral density or stability in unregulated modes.

Is the SOT-363 package compatible with standard reflow profiles for lead-free assembly?

Yes - the device is rated for moisture sensitivity level 1 per J-STD-020D and supports standard Pb-free reflow profiles (peak 260 °C, 10-second dwell). The matte tin finish and UL 94V-0 mold compound ensure robust solder joint formation without delamination or popcorning during JEDEC-compliant thermal cycling.

How does the dual-isolation architecture prevent interaction between the two Zener elements?

The two Zener junctions share no common substrate connection; each has dedicated anode and cathode terminals (A1/C1 and A2/C2) with physical separation confirmed in the die layout. Electrical isolation exceeds 1000 MΩ at 100 V bias, verified per DS31039 Rev. 15 test methodology - ensuring no current or voltage coupling affects regulation accuracy in either channel.