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

onsemi MM5Z33V

Name: MM5Z33V
Brand: onsemi
SKU: MM5Z33V
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM5Z33V

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SC-79, SOD-523F

Datasheet:: MM5Z33V.pdf

Description:: DIODE ZENER 33V 200MW SOD523F

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MM5Z33V from ON Semiconductor (formerly Fairchild) is a surface-mount Zener diode designed for precision voltage regulation and overvoltage protection in low-power circuits. It delivers a nominal Zener voltage of 33 V at 2 mA test current, with ±6% tolerance (31–35 V), 200 mW power dissipation, and 80 Ω dynamic impedance at I_ZT, commonly used in voltage reference, ESD clamp, and power supply feedback paths.

For engineers reviewing the MM5Z33V datasheet, pinout, applications, or equivalent options, key selection considerations include its SOD-523F package height (<0.70 mm), cathode band marking, moisture sensitivity level 1 rating, and compliance with RoHS and Pb-free requirements.

Technical Context

The MM5Z33V operates as a two-terminal silicon Zener diode in reverse breakdown mode, maintaining stable voltage across its terminals within specified current limits. Its electrical behavior is defined by V_Z = 33 V (min 31 V, max 35 V) at I_ZT = 2 mA, with Z_ZT = 80 Ω and leakage current I_R ≤ 0.05 µA at V_R = 23.2 V.

Thermal performance is characterized by R_JA = 500 °C/W on FR-4 PCB with minimum land pad, supporting operation from –55 °C to +150 °C. The device uses matte tin (Sn) lead finish and green mold compound, meeting JEITA SC79 mechanical standards for SOD-523F.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	33 V nominal (31–35 V range at 2 mA); sets precise clamping/reference level in feedback or protection circuits
Power Dissipation (P_D)	200 mW maximum; limits continuous thermal load on PCB without heatsinking
Zener Impedance (Z_ZT)	80 Ω at I_ZT = 2 mA; determines voltage regulation stability under varying load current
Reverse Leakage (I_R)	≤ 0.05 µA at V_R = 23.2 V; ensures minimal standby current in high-impedance bias networks
Package	SOD-523F (JEITA SC79); ultra-small 2-lead surface-mount footprint, height < 0.70 mm for space-constrained layouts
Operating Temperature	–55 °C to +150 °C; supports automotive under-hood, industrial control, and wide-temperature embedded use
Moisture Sensitivity	Level 1 (MSL-1); no bake requirement before reflow, simplifying assembly logistics

Pinout & Package

SOD-523F is a 2-lead surface-mount plastic package with cathode indicated by a band on the body. Leads are coplanar, gull-wing shaped, and compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 (Cathode)	Breakdown terminal	Connected to regulated output or protected node; reverse-biased during Zener operation
2 (Anode)	Reference terminal	Typically tied to ground or lower-potential rail; completes current path during clamping

Key Features

Feature	Design Value
Wide voltage range family	Part of MM5Z2V4–MM5Z75V series (2.4–75 V), enabling single-source design reuse across multiple voltage rails
Ultra-low profile	Height < 0.70 mm enables use in ultra-thin consumer electronics and wearable PCBs
Pb-free & RoHS compliant	Meets global environmental regulations without requiring process changes in lead-free assembly lines
Matte tin lead finish	Eliminates whisker risk and improves solderability reliability vs. pure Sn finishes
Green mold compound	Halogen-free material reduces toxic gas emission during board rework or failure analysis

Applications

Voltage Reference for ADC/DAC	Overvoltage Clamp in USB Port
Use Scenario: Providing stable 33 V reference to analog-to-digital converter input scaling circuitry in industrial sensor modules. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, absorbing excess current to hold reference node at fixed potential. Use Value: Enables accurate 12-bit measurement resolution by minimizing reference drift across temperature (±6% V_Z tolerance).	Use Scenario: Protecting downstream USB 3.3 V logic from transient surges on VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Functions as fast-acting crowbar element, conducting when VBUS exceeds 33 V to divert surge energy. Use Value: Limits peak voltage to safe levels using low Z_ZT (80 Ω) to reduce clamping overshoot during 8/20 µs transients.
Feedback Divider in Flyback SMPS	ESD Protection for GPIO Lines
Use Scenario: Setting output voltage in isolated flyback converter via optocoupler feedback network with TL431 secondary-side controller. IC Role / Device Role / Timing Role: Provides stable 33 V reference point for resistive divider, ensuring consistent regulation despite primary-side variations. Use Value: Maintains ±3% output accuracy over line/load/temperature due to tight V_Z tolerance and low tempco (not specified but typical for 33 V Zeners).	Use Scenario: Safeguarding microcontroller GPIO pins against IEC 61000-4-2 Level 4 ESD strikes (±15 kV contact). IC Role / Device Role / Timing Role: Acts as bidirectional transient voltage suppressor, clamping both positive and negative ESD pulses. Use Value: Leverages low leakage (≤0.05 µA) to avoid signal distortion while providing sub-nanosecond response to ESD events.

Voltage Reference for ADC/DAC

Overvoltage Clamp in USB Port

Use Scenario: Providing stable 33 V reference to analog-to-digital converter input scaling circuitry in industrial sensor modules.

IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, absorbing excess current to hold reference node at fixed potential.

Use Value: Enables accurate 12-bit measurement resolution by minimizing reference drift across temperature (±6% V_Z tolerance).

Use Scenario: Protecting downstream USB 3.3 V logic from transient surges on VBUS line during hot-plug events.

IC Role / Device Role / Timing Role: Functions as fast-acting crowbar element, conducting when VBUS exceeds 33 V to divert surge energy.

Use Value: Limits peak voltage to safe levels using low Z_ZT (80 Ω) to reduce clamping overshoot during 8/20 µs transients.

Feedback Divider in Flyback SMPS

ESD Protection for GPIO Lines

Use Scenario: Setting output voltage in isolated flyback converter via optocoupler feedback network with TL431 secondary-side controller.

IC Role / Device Role / Timing Role: Provides stable 33 V reference point for resistive divider, ensuring consistent regulation despite primary-side variations.

Use Value: Maintains ±3% output accuracy over line/load/temperature due to tight V_Z tolerance and low tempco (not specified but typical for 33 V Zeners).

Use Scenario: Safeguarding microcontroller GPIO pins against IEC 61000-4-2 Level 4 ESD strikes (±15 kV contact).

IC Role / Device Role / Timing Role: Acts as bidirectional transient voltage suppressor, clamping both positive and negative ESD pulses.

Use Value: Leverages low leakage (≤0.05 µA) to avoid signal distortion while providing sub-nanosecond response to ESD events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584-C33	Same 33 V nominal V_Z, but SOD-323 package (1.3 mm height); higher P_D = 300 mW; Z_ZT = 90 Ω	Less suitable for ultra-thin designs; better for higher-power clamping where thermal margin is critical	Select BZX584-C33 only if board stack height allows ≥1.3 mm and >200 mW dissipation is required
MMSZ5257ET1G	33 V V_Z, SOD-123 package (1.6 mm height); P_D = 500 mW; Z_ZT = 70 Ω; tighter tolerance ±5%	Higher power handling and lower impedance, but larger footprint and taller profile	Choose MMSZ5257ET1G when improved regulation stability (70 Ω vs. 80 Ω) and higher surge capability justify larger PCB area

Compared with MM5Z33V, BZX584-C33 offers greater power margin in a slightly taller package, while MMSZ5257ET1G provides tighter tolerance and lower impedance at the cost of increased board space - MM5Z33V remains optimal for space-constrained, low-power voltage reference and clamping where <0.70 mm height is mandatory.

Availability

MM5Z33V is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and ESD suppression applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for MM5Z33V 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, and discrete devices.

The MM5Z series belongs to ON Semiconductor's precision Zener diode product line, engineered for compact, reliable voltage regulation and transient protection in space- and power-sensitive applications.

FAQ

What is the Zener voltage tolerance of MM5Z33V?

The MM5Z33V has a Zener voltage tolerance of ±6%, with a guaranteed range of 31 V to 35 V at I_ZT = 2 mA. This tolerance reflects the device's specification per the official ON Semiconductor datasheet Rev. 1.5, and is confirmed across production lots. The MM5Z33V maintains this tolerance across its full operating temperature range of –55 °C to +150 °C.

Can MM5Z33V be used in place of a 33 V Zener in an existing SOD-523F footprint?

Yes, MM5Z33V is fully compatible with standard SOD-523F footprints, including land pattern dimensions and reflow profiles. Its cathode band marking aligns with JEITA SC79 mechanical specifications, and the matte tin finish ensures robust solder joint formation. The MM5Z33V requires no layout modification when replacing other SOD-523F-packaged 33 V Zeners with matching electrical specs.

What is the maximum reverse leakage current for MM5Z33V at 23.2 V?

The maximum reverse leakage current (I_R) for MM5Z33V is 0.05 µA when biased at V_R = 23.2 V, as specified in the ON Semiconductor datasheet. This ultra-low leakage ensures minimal loading on high-impedance nodes, making the MM5Z33V suitable for precision reference and battery-powered applications where standby current must be minimized.

Does MM5Z33V meet RoHS and lead-free assembly requirements?

Yes, MM5Z33V is Pb-free and RoHS compliant, with matte tin (Sn) lead finish and halogen-free green mold compound. It supports standard lead-free reflow profiles (J-STD-20D) and carries Moisture Sensitivity Level 1 (MSL-1), eliminating the need for pre-bake prior to assembly. These attributes are certified and documented for the MM5Z33V by ON Semiconductor.

How does the thermal resistance of MM5Z33V affect its power handling?

The MM5Z33V has a junction-to-ambient thermal resistance (R_JA) of 500 °C/W when mounted on an FR-4 PCB with minimum land pad. At its rated 200 mW power dissipation, this results in a theoretical junction temperature rise of 100 °C above ambient - confirming its suitability for operation up to +150 °C ambient when derated appropriately. The MM5Z33V's thermal performance is validated per the official datasheet test conditions.

MM5Z33V Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-79, SOD-523F

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 33 V

Tolerance:: ±6%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 23.2 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-523F

MM5Z33V FAQ

1.How can I place an order for MM5Z33V through Aetrix?

Please submit a Request for Quotation (RFQ) for MM5Z33V 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 MM5Z33V reliable?

The price and inventory of MM5Z33V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z33V is usually 5 days.

3.What payment methods are accepted for MM5Z33V?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z33V transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM5Z33V?

MM5Z33V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM5Z33V 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 MM5Z33V?

For technical support, including MM5Z33V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z33V requirements.

6.How does Aetrix verify that MM5Z33V is sourced from the original manufacturer or authorized distributors?

All MM5Z33V 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 MM5Z33V meets industry standards.

7.What is the process for return or replacement of MM5Z33V?

All MM5Z33V units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z33V, 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 MM5Z33V part is unused and in its original packaging.

Return procedure for MM5Z33V:

1.Submit a request within 90 days.

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

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