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

onsemi MMSZ5226B

Name: MMSZ5226B
Brand: onsemi
SKU: MMSZ5226B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMSZ5226B

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: MMSZ5226B.pdf

Description:: DIODE ZENER 3.3V 500MW SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:4,296

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Product details

Overview

MMSZ5226B from Fairchild Semiconductor is a 3.3 V, 500 mW surface-mount Zener diode in SOD-123 package with ±5% tolerance, 28 Ω dynamic impedance at 20 mA, and 0.25 µA reverse leakage at 2.5 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the MMSZ5226B datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (3.3 V), power rating (500 mW), thermal resistance (340 °C/W), and SOD-123 footprint compatibility in space-constrained PCB designs.

Technical Context

The MMSZ5226B operates as a two-terminal voltage-reference device, clamping reverse-biased voltage at 3.3 V with tight 5% tolerance and low dynamic impedance (28 Ω typical at I_Z = 20 mA). It maintains stable regulation across -55°C to +150°C junction temperature range.

Its forward voltage is ≤0.9 V at 10 mA, enabling bidirectional protection use cases. Absolute maximum ratings specify 500 mW power dissipation at 25°C ambient and 340 °C/W junction-to-ambient thermal resistance on FR-4 board with recommended land pads.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.3 V nominal, min 3.135 V / max 3.465 V - defines precise regulation point for low-voltage references
Power Dissipation (P_D)	500 mW at 25°C - sets maximum continuous DC power handling without derating
Zener Impedance (Z_Z)	28 Ω typical at 20 mA - determines output voltage stability under load variation
Reverse Leakage (I_R)	0.25 µA at 2.5 V - ensures minimal quiescent current in standby or battery-powered circuits
Forward Voltage (V_F)	≤0.9 V at 10 mA - supports dual-use as clamp or ESD protection in bidirectional signal paths
Package	SOD-123 - compact 2-pin surface-mount outline with standardized land pattern for automated assembly
Tolerance	±5% - enables predictable voltage margining in feedback loops and reference dividers

Pinout & Package

SOD-123 package: 2-terminal surface-mount diode with cathode band marking; dimensions 2.7 × 1.6 × 1.1 mm; JEDEC-compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node in reverse-bias regulation; enables forward conduction ≤0.9 V
Cathode	Zener breakdown terminal	Connected to higher-potential node; establishes 3.3 V reference when reverse biased above knee voltage

Key Features

Feature	Design Value
Low dynamic impedance	28 Ω at 20 mA - minimizes output voltage deviation under varying load currents
Wide operating temperature	-55°C to +150°C junction range - supports industrial and automotive under-hood applications
Precision voltage tolerance	±5% - eliminates need for external trimming in most 3.3 V reference designs
Low leakage current	0.25 µA at 2.5 V - preserves battery life in always-on sensor nodes and IoT endpoints
Compact SOD-123 footprint	2.7 × 1.6 mm body - fits high-density layouts where space is constrained, e.g., wearables and portable medical devices

Applications

Power Supply Regulation	ADC Reference Voltage
Use Scenario: Stabilizing 3.3 V rail for microcontroller I/O and peripheral interfaces in low-noise embedded systems. IC Role / Device Role / Timing Role: Voltage reference and shunt regulator providing stable bias point for LDO feedback or direct rail clamping. Use Value: Maintains 3.3 V ±5% accuracy over temperature and load, reducing need for active regulation in cost-sensitive designs.	Use Scenario: Generating precise 3.3 V reference for 12-bit SAR ADCs in data acquisition modules. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source replacing larger IC-based references. Use Value: Delivers <0.5% total error contribution from Zener tolerance and thermal drift, meeting mid-resolution ADC requirements.
Overvoltage Protection	Signal Level Translation
Use Scenario: Clamping 3.3 V logic lines against transient surges in industrial fieldbus interfaces. IC Role / Device Role / Timing Role: Bidirectional transient suppressor leveraging both Zener breakdown and forward conduction. Use Value: Limits voltage excursions to ≤3.465 V (reverse) and ≤0.9 V (forward), protecting downstream CMOS inputs.	Use Scenario: Shifting 5 V UART signals to 3.3 V logic levels using passive resistor-Zener topology. IC Role / Device Role / Timing Role: Clamp diode establishing 3.3 V threshold for level translation without active circuitry. Use Value: Enables reliable 5 V ↔ 3.3 V interfacing with <10 ns propagation delay and no supply dependency.

Power Supply Regulation

ADC Reference Voltage

Use Scenario: Stabilizing 3.3 V rail for microcontroller I/O and peripheral interfaces in low-noise embedded systems.

IC Role / Device Role / Timing Role: Voltage reference and shunt regulator providing stable bias point for LDO feedback or direct rail clamping.

Use Value: Maintains 3.3 V ±5% accuracy over temperature and load, reducing need for active regulation in cost-sensitive designs.

Use Scenario: Generating precise 3.3 V reference for 12-bit SAR ADCs in data acquisition modules.

IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source replacing larger IC-based references.

Use Value: Delivers <0.5% total error contribution from Zener tolerance and thermal drift, meeting mid-resolution ADC requirements.

Overvoltage Protection

Signal Level Translation

Use Scenario: Clamping 3.3 V logic lines against transient surges in industrial fieldbus interfaces.

IC Role / Device Role / Timing Role: Bidirectional transient suppressor leveraging both Zener breakdown and forward conduction.

Use Value: Limits voltage excursions to ≤3.465 V (reverse) and ≤0.9 V (forward), protecting downstream CMOS inputs.

Use Scenario: Shifting 5 V UART signals to 3.3 V logic levels using passive resistor-Zener topology.

IC Role / Device Role / Timing Role: Clamp diode establishing 3.3 V threshold for level translation without active circuitry.

Use Value: Enables reliable 5 V ↔ 3.3 V interfacing with <10 ns propagation delay and no supply dependency.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584-C3V3	3.3 V, ±5%, 300 mW, SOD-323 package, 90 Ω Z_Z at 5 mA	Lower power rating and higher impedance limit use in higher-current regulation	Preferred where board space is tighter (SOD-323) and load current ≤5 mA
MM3Z3V3T1G	3.3 V, ±5%, 200 mW, SOD-323, 90 Ω Z_Z at 5 mA, AEC-Q200 qualified	Automotive-qualified but lower power and higher impedance than MMSZ5226B	Selected for automotive body electronics requiring qualification, not for high-stability reference use

Compared with BZX584-C3V3 and MM3Z3V3T1G, the MMSZ5226B offers higher power handling (500 mW vs. 200–300 mW) and lower dynamic impedance (28 Ω vs. 90 Ω), making it better suited for stable 3.3 V reference generation in industrial and general-purpose analog circuits.

Availability

MMSZ5226B is available at Aetrix Electronics and suitable for power supply regulation, ADC reference design, overvoltage protection, and signal level translation requiring stable component supply and consistent parametric performance.

Supply support for MMSZ5226B 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The MMSZ5226B belongs to Fairchild's MMSZ52xxB Zener diode family, designed for precision voltage reference and regulation in space-constrained, low-power consumer and industrial applications.

FAQ

What is the nominal Zener voltage of the MMSZ5226B?

The MMSZ5226B has a nominal Zener voltage of 3.3 V, with a guaranteed range of 3.135 V to 3.465 V at 20 mA test current and 25°C ambient temperature. This value is specified in the Electrical Characteristics table of the Fairchild Rev. E datasheet and defines the primary regulation point for circuit design.

What package type does the MMSZ5226B use?

The MMSZ5226B uses the SOD-123 surface-mount package, measuring 2.7 mm × 1.6 mm × 1.1 mm with a standard cathode band marking. Its JEDEC-compliant footprint supports automated placement and reflow soldering, and thermal resistance is specified at 340 °C/W on FR-4 board with minimum recommended land pads.

What is the maximum power dissipation rating for the MMSZ5226B?

The MMSZ5226B has a maximum power dissipation (P_D) of 500 mW at 25°C ambient temperature. Derating is required above 25°C per the thermal resistance specification of 340 °C/W, and the absolute maximum junction temperature is +150°C.

How does the MMSZ5226B perform under reverse bias conditions?

Under reverse bias, the MMSZ5226B regulates at 3.3 V with dynamic impedance of 28 Ω (typical) at 20 mA, and exhibits only 0.25 µA reverse leakage current at 2.5 V. These parameters ensure stable reference behavior and low standby power loss in precision analog circuits.

Is the MMSZ5226B suitable for automotive applications?

The MMSZ5226B is not AEC-Q200 qualified and lacks automotive-specific reliability testing or extended temperature validation beyond its rated -55°C to +150°C junction range. For automotive use, alternatives like MM3Z3V3T1G are recommended due to formal qualification and process controls.

MMSZ5226B Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 3.3 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 28 Ohms

Current - Reverse Leakage @ Vr:: 25 µA @ 1 V

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

Operating Temperature:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123

MMSZ5226B FAQ

1.How can I place an order for MMSZ5226B through Aetrix?

Please submit a Request for Quotation (RFQ) for MMSZ5226B 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 MMSZ5226B reliable?

The price and inventory of MMSZ5226B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5226B is usually 5 days.

3.What payment methods are accepted for MMSZ5226B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5226B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMSZ5226B?

MMSZ5226B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMSZ5226B 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 MMSZ5226B?

For technical support, including MMSZ5226B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5226B requirements.

6.How does Aetrix verify that MMSZ5226B is sourced from the original manufacturer or authorized distributors?

All MMSZ5226B 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 MMSZ5226B meets industry standards.

7.What is the process for return or replacement of MMSZ5226B?

All MMSZ5226B units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5226B, 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 MMSZ5226B part is unused and in its original packaging.

Return procedure for MMSZ5226B:

1.Submit a request within 90 days.

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

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