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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Zener Diode Arrays

Diodes Incorporated MMBZ5231BS-7-F

Name: MMBZ5231BS-7-F
Brand: Diodes Incorporated
SKU: MMBZ5231BS-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBZ5231BS-7-F

Manufacturer:: Diodes Incorporated

Category:: Zener Diode Arrays

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: MMBZ5231BS-7-F.pdf

Description:: DIODE ZENER ARRAY 5.1V SOT363

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Product details

Overview

MMBZ5231BS-7-F from Diodes Incorporated is a dual-isolated 5.1 V Zener diode pair in SOT-363 package, rated for 200 mW power dissipation and 17 Ω zener impedance at 20 mA test current, with reverse leakage ≤5 μA at 2.0 V, used for precision voltage reference and overvoltage protection in space-constrained analog signal conditioning circuits.

For engineers reviewing the MMBZ5231BS-7-F datasheet, MMBZ5231BS-7-F pinout, MMBZ5231BS-7-F application, or MMBZ5231BS-7-F equivalent, key selection criteria include nominal zener voltage tolerance (±5%), low dynamic impedance, dual-diode isolation, SOT-363 thermal resistance (625 °C/W), and RoHS-compliant matte tin plating.

Technical Context

This device integrates two electrically isolated Zener diodes in a single ultra-small surface-mount package, enabling bidirectional clamping or independent reference generation without cross-coupling. Each diode exhibits sharp breakdown characteristics with typical zener impedance of 17 Ω at I_ZT = 20 mA and <1600 Ω at I_ZK = 0.25 mA.

It operates across –65 °C to +150 °C, with thermal resistance of 625 °C/W on FR4 PCB using recommended pad layout, and maintains stable 5.1 V regulation under pulse conditions per JEDEC J-STD-020D Level 1 moisture sensitivity rating.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (Nom)	5.1 V - precise regulation point for low-voltage reference or clamp threshold
Zener Voltage Range	4.85–5.36 V - ±5% tolerance ensures predictable trip point in protection circuits
Test Current (I_ZT)	20 mA - standard operating point for specified zener impedance and voltage accuracy
Zener Impedance (Z_ZT)	17 Ω - low dynamic resistance minimizes output voltage variation under load changes
Power Dissipation	200 mW - maximum continuous power handling on FR4 board with defined thermal layout
Reverse Leakage (I_R)	≤5 μA at 2.0 V - negligible standby current in high-impedance bias networks
Thermal Resistance (R_θJA)	625 °C/W - defines temperature rise per watt on standard PCB; requires derating above 25 °C ambient

Pinout & Package

SOT-363 (SC-70-6) plastic surface-mount package with six terminals: two anodes (A1, A2), two cathodes (C1, C2), and two no-connect (NC) pins. Molded UL 94V-0 plastic case; matte tin-plated Alloy 42 leadframe; polarity shown in top-view schematic.

Pin/Terminal	Circuit Role	Design Meaning
C1	Cathode of Diode 1	Connected to regulated node; conducts when voltage exceeds 5.1 V relative to A1
A1	Anode of Diode 1	Reference/ground return path for first Zener; isolates from Diode 2
C2	Cathode of Diode 2	Independent clamping node; enables dual-rail or differential reference use
A2	Anode of Diode 2	Second isolated ground return; no electrical connection to A1 or C1
NC	No Connect	Unbonded terminal; must remain unconnected to avoid parasitic coupling
NC	No Connect	Unbonded terminal; no internal connection; leave floating

Key Features

Feature	Design Value
Dual isolated Zener diodes	Enables independent voltage references or bidirectional clamping without shared paths
200 mW power rating	Supports transient suppression and steady-state regulation in compact DC-DC feedback loops
SOT-363 footprint	Reduces PCB area by >40% vs. SOIC-8 equivalents while maintaining thermal performance
Lead-free / RoHS compliant	Meets global environmental regulations without compromising solderability or reliability
Level 1 moisture sensitivity	Eliminates bake requirements before reflow, streamlining automated assembly

Applications

Industrial Sensor Signal Conditioning

USB Port ESD Protection

Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in PLC I/O modules.

IC Role / Device Role / Timing Role: Dual-Zener provides matched 5.1 V reference for ADC driver and clamps transients on sensor lines.

Use Value: Tight 4.85–5.36 V tolerance ensures <0.5% gain error; low 17 Ω Z_ZT prevents drift under varying load currents.

Use Scenario: Protecting USB 2.0 D+ and D− lines from contact discharge per IEC 61000-4-2 Level 4.

IC Role / Device Role / Timing Role: One diode clamps D+ to 5.1 V, the other clamps D− to ground-bidirectional protection without series resistance.

Use Value: Dual-isolation prevents coupling between data lines; ≤5 μA leakage avoids bus pull-down during idle states.

Low-Power MCU Voltage Monitoring

Automotive Body Control Module Reference

Use Scenario: Supply rail monitoring for brown-out detection in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Zener diode feeds comparator input to trigger reset when V_CC drops below 4.85 V.

Use Value: Guaranteed 4.85 V minimum breakdown ensures reliable reset assertion across temperature and aging.

Use Scenario: Providing stable 5.1 V reference for LIN transceiver biasing in door module ECUs.

IC Role / Device Role / Timing Role: Regulates local LDO input to maintain clean 5 V supply despite battery ripple up to ±2 V.

Use Value: 625 °C/W R_θJA allows operation at 105 °C ambient without derating loss; RoHS compliance meets automotive sourcing mandates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C5V1-7-F	Single 5.1 V Zener in SOT-23; 300 mW rating; 60 Ω Z_ZT at 5 mA	Lacks dual-diode isolation; higher impedance reduces regulation accuracy under load	Choose when only one reference is needed and board space permits larger thermal footprint
MMBZ5231B-7-F	Same electrical specs but in SOT-23 (single diode); no dual-isolation capability	Cannot support bidirectional clamping or independent reference pairs	Select only if dual functionality is unnecessary and SOT-23 placement simplifies layout

Compared with BZX84-C5V1-7-F and MMBZ5231B-7-F, MMBZ5231BS-7-F uniquely delivers two isolated 5.1 V Zeners in SOT-363-enabling compact dual-rail protection or matched reference generation where space and isolation are critical.

Availability

MMBZ5231BS-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection, low-power MCU monitoring, and automotive body control modules requiring stable component supply and RoHS-compliant packaging.

Supply support for MMBZ5231BS-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 regulation and transient suppression in portable, automotive, and industrial electronics.

FAQ

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

The nominal zener voltage is 5.1 V with a guaranteed range of 4.85 V to 5.36 V at 20 mA test current. Breakdown occurs within this band; operation above 5.36 V risks exceeding power limits unless current is strictly limited by external series resistance to stay within 200 mW dissipation.

Can both Zener diodes be used simultaneously without interference?

Yes-C1/A1 and C2/A2 form two fully isolated junctions with no internal connection. Electrical separation is confirmed by device schematic and mechanical construction; crosstalk is negligible up to 100 MHz, making simultaneous use in differential or dual-rail configurations reliable.

Is the SOT-363 package compatible with standard reflow profiles?

Yes-the device is rated for JEDEC Level 1 moisture sensitivity and uses matte tin plating compatible with Pb-free reflow profiles (peak 260 °C). No pre-bake is required, and it withstands standard IPC/JEDEC J-STD-020D thermal cycling without delamination or solder joint failure.

How does its zener impedance compare to single-diode alternatives in the same package?

At 20 mA, MMBZ5231BS-7-F achieves 17 Ω Z_ZT, matching the best-in-class performance of single-diode SOT-363 Zeners. This is 3× lower than comparable dual-diode offerings like the BZX84-B5V1, enabling tighter regulation in feedback loops and lower noise in reference applications.

MMBZ5231BS-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-TSSOP, SC-88, SOT-363

Packaging:: Tape & Reel (TR)

Product Status:: Active

Configuration:: 2 Independent

Voltage - Zener (Nom) (Vz):: 5.1 V

Tolerance:: ±5%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 17 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 2 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-363

MMBZ5231BS-7-F FAQ

1.How can I place an order for MMBZ5231BS-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5231BS-7-F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MMBZ5231BS-7-F reliable?

The price and inventory of MMBZ5231BS-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5231BS-7-F is usually 5 days.

3.What payment methods are accepted for MMBZ5231BS-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231BS-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5231BS-7-F?

MMBZ5231BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5231BS-7-F order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MMBZ5231BS-7-F?

For technical support, including MMBZ5231BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231BS-7-F requirements.

6.How does Aetrix verify that MMBZ5231BS-7-F is sourced from the original manufacturer or authorized distributors?

All MMBZ5231BS-7-F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBZ5231BS-7-F meets industry standards.

7.What is the process for return or replacement of MMBZ5231BS-7-F?

All MMBZ5231BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231BS-7-F, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MMBZ5231BS-7-F part is unused and in its original packaging.

Return procedure for MMBZ5231BS-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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