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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Diodes Incorporated MMBZ5243B-7-F

Name: MMBZ5243B-7-F
Brand: Diodes Incorporated
SKU: MMBZ5243B-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBZ5243B-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBZ5243B-7-F.pdf

Description:: DIODE ZENER 13V 350MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,132

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Product details

Overview

MMBZ5243B-7-F from Diodes Incorporated is a 13 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 9.5 mA test current, 13 Ω dynamic impedance at 1 kHz, and 0.5 µA reverse leakage at 9.9 V. It provides precision voltage regulation in low-power biasing, reference, and overvoltage protection circuits on FR-4 PCBs.

For engineers reviewing the MMBZ5243B-7-F datasheet, MMBZ5243B-7-F pinout, MMBZ5243B-7-F application, or MMBZ5243B-7-F equivalent, key selection criteria include Zener voltage tolerance (±5% at 13 V), thermal resistance (357 °C/W), JEDEC-compliant reliability, and RoHS/Green compliance for industrial and automotive-qualified designs.

Technical Context

This Zener diode operates in reverse breakdown with tightly controlled voltage regulation across its nominal 13 V range (12.35–13.65 V at I_ZT = 9.5 mA). Its planar die construction ensures stable Zener impedance (13 Ω typical) and low temperature coefficient under DC and pulsed conditions.

The device is characterized for operation from −65 °C to +150 °C, with power derating above +25 °C per Fig. 1. Its SOT23 package supports automated assembly and delivers 350 mW dissipation on standard FR-4 layouts with recommended pad dimensions.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	13 V nominal, 12.35–13.65 V range at 9.5 mA - defines regulated output voltage tolerance for reference/bias circuits
Power Dissipation (P_D)	350 mW on FR-4 PCB - sets maximum continuous power handling without forced cooling
Zener Impedance (Z_ZT)	13 Ω at 1 kHz, 9.5 mA - determines AC regulation stability and ripple rejection capability
Reverse Leakage (I_R)	0.5 µA at V_R = 9.9 V - ensures minimal standby current in high-impedance sensing or clamping paths
Thermal Resistance (R_θJA)	357 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design margin
Operating Temperature	−65 °C to +150 °C - enables use in extended industrial and under-hood automotive environments

Pinout & Package

Package: SOT23 - 3-terminal surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward conduction terminal / cathode reference ground path	Connected to circuit ground or lower potential node when used as shunt regulator
Cathode (Pin 2)	Zener breakdown terminal / regulated voltage output	Connected to input supply via series resistor; delivers stable 13 V to load
No-Connect (Pin 3)	Unused internal leadframe tie-bar	Electrically isolated; must remain unconnected per datasheet mechanical diagram

Key Features

Feature	Design Value
Planar die construction	Enables tight Zener voltage distribution and long-term stability under thermal cycling
350 mW FR-4 power rating	Supports robust regulation in space-constrained PCBs without heatsinking
Lead-free & RoHS 3 compliant	Fulfills EU environmental directives and eliminates solder joint reliability risks from lead contamination
Halogen- and antimony-free "Green" compound	Meets IPC-1752A material declaration requirements for sustainable electronics manufacturing

Applications

Power Supply Reference

Overvoltage Clamp

Use Scenario: Stabilizing feedback voltage in linear regulators or op-amp reference circuits.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 13 V bias point.

Use Value: Maintains ±5% output accuracy across temperature and line variations due to low Z_ZT and tight V_Z tolerance.

Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 13 V.

IC Role / Device Role / Timing Role: Reverse-biased clamping element diverting excess energy to ground.

Use Value: Limits peak voltage to 13.65 V (max) with sub-µA leakage below clamp threshold, minimizing standby loading.

Sensor Bias Network

Automotive ECU Protection

Use Scenario: Supplying stable excitation voltage to resistive bridge sensors in industrial transmitters.

IC Role / Device Role / Timing Role: Precision DC bias source maintaining sensor linearity and offset stability.

Use Value: Delivers <0.5 µA leakage at 9.9 V, preventing measurement drift in high-impedance sensor interfaces.

Use Scenario: Safeguarding CAN transceiver inputs against load-dump spikes in 12 V vehicle systems.

IC Role / Device Role / Timing Role: Secondary clamping stage after TVS, absorbing residual energy post-spike.

Use Value: Operates reliably from −65 °C to +150 °C and meets AEC-Q200 stress test requirements when qualified Q-suffix variant is selected.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C13	Same 13 V nominal, but 300 mW rating and higher Z_ZT (30 Ω); SOT23 package with different marking and thermal profile	Limited to lower-power or less demanding regulation where 50 mW margin and 17 Ω higher impedance are acceptable	Select when cost sensitivity outweighs need for lowest Z_ZT and highest P_D margin
MMBZ5243BS-7-F	Identical electrical specs but SOT323 package (smaller footprint, higher R_θJA = 430 °C/W)	Used where board area is constrained but thermal management can accommodate reduced power derating	Select only if layout density requires smaller package and thermal simulation confirms safe junction temperature

Compared with BZX84-C13 and MMBZ5243BS-7-F, MMBZ5243B-7-F offers superior power handling (350 mW vs. 300/350 mW) and lowest Zener impedance (13 Ω), making it optimal for precision reference and high-reliability clamping where thermal and regulation performance are prioritized.

Availability

MMBZ5243B-7-F is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and sensor bias network applications requiring stable component supply, consistent Zener voltage matching, and full RoHS/Green compliance.

Supply support for MMBZ5243B-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, industry-qualified components for automotive, industrial, and computing markets.

This part belongs to the MMBZ52xxB Zener diode family, designed specifically for precision voltage regulation and protection in compact, automated-assembly PCBs with stringent environmental compliance requirements.

FAQ

What is the maximum Zener test current for MMBZ5243B-7-F?

The specified Zener test current (I_ZT) is 9.5 mA, measured at which the nominal 13 V Zener voltage is guaranteed within 12.35–13.65 V. This current defines the operating point for datasheet parameters including Z_ZT and V_Z tolerance, and must be supplied via an external series resistor in shunt regulator configurations.

Does MMBZ5243B-7-F meet automotive qualification standards?

The base MMBZ5243B-7-F is not AEC-Q200 qualified; however, Diodes offers automotive-grade variants with "Q" suffix (e.g., MMBZ5243BQ-7-F) manufactured in IATF 16949-certified facilities and qualified to AEC-Q200. These variants share identical electrical specs but include PPAP documentation and enhanced process controls.

How does the SOT23 package affect thermal performance?

In the SOT23 package, MMBZ5243B-7-F achieves a junction-to-ambient thermal resistance of 357 °C/W on FR-4 PCB with recommended pad layout. This value assumes no copper pour or thermal vias; adding thermal relief or ground-plane connections can reduce R_θJA by up to 30%, directly improving safe operating area at elevated ambient temperatures.

Can MMBZ5243B-7-F replace older MMBZ5243B variants?

Yes - the "-7-F" suffix denotes tape-and-reel packaging (3,000 units/reel) with lead-free, halogen-free "Green" construction. Electrically and mechanically identical to prior MMBZ5243B versions, it replaces legacy variants while meeting modern environmental and assembly requirements without design changes.

MMBZ5243B-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 13 V

Tolerance:: ±5%

Power - Max:: 350 mW

Impedance (Max) (Zzt):: 13 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 9.9 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-23-3

MMBZ5243B-7-F FAQ

1.How can I place an order for MMBZ5243B-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5243B-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 MMBZ5243B-7-F reliable?

The price and inventory of MMBZ5243B-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 MMBZ5243B-7-F is usually 5 days.

3.What payment methods are accepted for MMBZ5243B-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5243B-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5243B-7-F?

MMBZ5243B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5243B-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 MMBZ5243B-7-F?

For technical support, including MMBZ5243B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5243B-7-F requirements.

6.How does Aetrix verify that MMBZ5243B-7-F is sourced from the original manufacturer or authorized distributors?

All MMBZ5243B-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 MMBZ5243B-7-F meets industry standards.

7.What is the process for return or replacement of MMBZ5243B-7-F?

All MMBZ5243B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5243B-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 MMBZ5243B-7-F part is unused and in its original packaging.

Return procedure for MMBZ5243B-7-F:

1.Submit a request within 90 days.

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

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