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

onsemi SZMM5Z3V0T1G

Name: SZMM5Z3V0T1G
Brand: onsemi
SKU: SZMM5Z3V0T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMM5Z3V0T1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SC-79, SOD-523

Datasheet:: SZMM5Z3V0T1G.pdf

Description:: DIODE ZENER 3V 500MW SOD523

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Product details

Overview

SZMM5Z3V0T1G from onsemi is a 3.0 V Zener diode in SOD-523 package, rated for 500 mW steady-state power dissipation, ±5% voltage tolerance at 2.1 mA test current, with 100 Ω maximum Zener impedance at I_ZT, and 10 µA reverse leakage at 1.0 V. It provides precision low-voltage regulation in space-constrained portable electronics such as smartphone power rail clamping and USB interface overvoltage protection.

For engineers reviewing the SZMM5Z3V0T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.0 V nominal Zener voltage, SOD-523 footprint compatibility, 16 kV HBM ESD rating, AEC-Q101 qualification for automotive use, and thermal resistance of 250 °C/W on FR-4 board.

Technical Context

This device operates as a two-terminal voltage reference and transient clamp, leveraging avalanche breakdown in silicon PN junction. Its 3.0 V nominal Zener voltage is specified at I_ZT = 2.1 mA with ±5% tolerance, and it maintains stable regulation down to I_ZK = 1.0 mA where Zener impedance rises to 1000 Ω.

The SOD-523 package enables surface-mount integration with 1.20 mm × 0.80 mm body and 0.7 mm height, supporting reflow up to 260 °C (MSL 1). It achieves Class 3 ESD robustness (>16 kV HBM) and meets RoHS and Pb-free requirements per onsemi's manufacturing standards.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.0 V nominal, min 2.8 V / max 3.2 V at I_ZT = 2.1 mA - defines precise clamping threshold for 3.3 V rail protection
Power Dissipation (P_D)	500 mW at T_A = 25 °C - supports continuous regulation in low-power sensor interfaces without heatsinking
Zener Impedance (Z_ZT)	100 Ω max at I_ZT = 2.1 mA - ensures minimal voltage deviation under dynamic load transients
Reverse Leakage (I_R)	10 µA max at V_R = 1.0 V - guarantees negligible standby current in battery-powered systems
ESD Rating	Class 3 (>16 kV HBM) - protects downstream ICs from human-body electrostatic discharge in handheld assemblies
Package	SOD-523 (Case 502) - 1.20 mm × 0.80 mm × 0.70 mm footprint ideal for high-density PCBs and thin-profile devices
AEC-Q101 Qualified	Yes - validated for automotive applications including infotainment power rails and body control modules

Pinout & Package

SOD-523 surface-mount package with cathode marked by polarity band; total body dimensions: 1.20 mm × 0.80 mm × 0.70 mm; mounting position unrestricted; qualified for 260 °C reflow.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to regulated output node; accepts reverse bias for Zener conduction; polarity band must align with PCB silkscreen
2 (Non-banded End)	Anode	Connected to ground or lower-potential reference; completes current path during overvoltage events

Key Features

Feature	Design Value
Low-profile SOD-523 package	Enables placement in <1.0 mm board gaps and supports automated optical inspection (AOI) due to standardized marking
16 kV HBM ESD rating	Eliminates need for external TVS diodes in consumer USB and audio jack interfaces, reducing BOM count
AEC-Q101 qualification	Validates reliability for automotive ambient temperature range (−65 °C to +150 °C) and vibration endurance
500 mW power rating	Handles sustained 100 mA surge currents at 3.0 V clamp level without thermal runaway on standard FR-4
Pb-free and RoHS compliant	Meets global environmental compliance mandates without requiring special soldering profiles or exemptions

Applications

Smartphone Power Rail Clamping	USB 2.0 Data Line Protection
Use Scenario: Protecting 3.3 V I/O supply rail from ESD and coupling transients during charging or accessory insertion. IC Role / Device Role: Low-voltage Zener clamp placed between V_IO and GND, shunting excess energy before it reaches PMIC or application processor. Use Value: Maintains rail stability within ±0.2 V during 8 kV contact discharge per IEC 61000-4-2, avoiding brownout resets.	Use Scenario: Safeguarding D+ and D− lines against electrostatic discharge in portable OTG adapters and docking stations. IC Role / Device Role: Bidirectional transient suppressor mounted directly at USB connector, leveraging symmetric Zener behavior below 3.0 V forward drop. Use Value: Limits line voltage to ≤3.0 V during 15 kV air discharge, preserving signal integrity and preventing PHY latch-up.
Automotive Body Control Module (BCM)	Wearable Sensor Node Regulation
Use Scenario: Providing stable 3.0 V reference for LIN bus transceivers and LED driver feedback loops in interior lighting modules. IC Role / Device Role: Precision voltage reference and overvoltage limiter tied to microcontroller ADC reference input and transceiver bias network. Use Value: Delivers <±1% drift over −40 °C to +125 °C ambient, ensuring accurate current sensing and PWM dimming consistency.	Use Scenario: Regulating power to ultra-low-power accelerometers and BLE SoCs in hearables with coin-cell batteries. IC Role / Device Role: Shunt regulator maintaining constant 3.0 V across variable load (10 µA–2 mA), replacing linear regulators to minimize quiescent loss. Use Value: Draws only 10 µA leakage at 1.0 V reverse bias, extending battery life beyond 12 months in always-on motion detection mode.

Smartphone Power Rail Clamping

USB 2.0 Data Line Protection

Use Scenario: Protecting 3.3 V I/O supply rail from ESD and coupling transients during charging or accessory insertion.

IC Role / Device Role: Low-voltage Zener clamp placed between V_IO and GND, shunting excess energy before it reaches PMIC or application processor.

Use Value: Maintains rail stability within ±0.2 V during 8 kV contact discharge per IEC 61000-4-2, avoiding brownout resets.

Use Scenario: Safeguarding D+ and D− lines against electrostatic discharge in portable OTG adapters and docking stations.

IC Role / Device Role: Bidirectional transient suppressor mounted directly at USB connector, leveraging symmetric Zener behavior below 3.0 V forward drop.

Use Value: Limits line voltage to ≤3.0 V during 15 kV air discharge, preserving signal integrity and preventing PHY latch-up.

Automotive Body Control Module (BCM)

Wearable Sensor Node Regulation

Use Scenario: Providing stable 3.0 V reference for LIN bus transceivers and LED driver feedback loops in interior lighting modules.

IC Role / Device Role: Precision voltage reference and overvoltage limiter tied to microcontroller ADC reference input and transceiver bias network.

Use Value: Delivers <±1% drift over −40 °C to +125 °C ambient, ensuring accurate current sensing and PWM dimming consistency.

Use Scenario: Regulating power to ultra-low-power accelerometers and BLE SoCs in hearables with coin-cell batteries.

IC Role / Device Role: Shunt regulator maintaining constant 3.0 V across variable load (10 µA–2 mA), replacing linear regulators to minimize quiescent loss.

Use Value: Draws only 10 µA leakage at 1.0 V reverse bias, extending battery life beyond 12 months in always-on motion detection mode.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584-C3V0	3.0 V, ±5%, SOD-523, 300 mW P_D, 150 Ω Z_ZT - lower power rating and higher impedance than SZMM5Z3V0T1G	Not AEC-Q101 qualified; limited to commercial-grade portable electronics, not automotive	Select when cost sensitivity outweighs automotive qualification and higher power margin is unnecessary
MMSZ5226ET1G	3.3 V nominal, ±5%, SOD-123, 500 mW, 17 Ω Z_ZT - different voltage, larger package, lower impedance	SOD-123 requires 30% more PCB area; better for high-current clamping but incompatible with ultra-dense layouts	Choose when 3.3 V regulation is acceptable and board space allows SOD-123; avoid if 3.0 V exact match or SOD-523 footprint is mandatory

Compared with BZX584-C3V0 and MMSZ5226ET1G, the SZMM5Z3V0T1G uniquely combines 3.0 V precision, AEC-Q101 qualification, SOD-523 miniaturization, and 500 mW capability-making it optimal for automotive and premium portable designs where voltage accuracy, footprint, and reliability are jointly constrained.

Availability

SZMM5Z3V0T1G is available at Aetrix Electronics and suitable for smartphone power rail clamping, USB 2.0 data line protection, and automotive body control module (BCM) designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SZMM5Z3V0T1G 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

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The SZMM5ZxxxT1G series is part of onsemi's precision Zener regulator portfolio, engineered specifically for space-constrained, high-reliability applications demanding tight voltage tolerance, low leakage, and automotive-grade qualification.

FAQ

What is the nominal Zener voltage and tolerance of SZMM5Z3V0T1G?

The SZMM5Z3V0T1G has a nominal Zener voltage of 3.0 V with a standard tolerance of ±5%, specified at a test current of 2.1 mA. Its minimum and maximum Zener voltages are 2.8 V and 3.2 V respectively, making it suitable for precise 3.3 V rail clamping where tight regulation is critical. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet.

Is SZMM5Z3V0T1G qualified for automotive applications?

Yes, SZMM5Z3V0T1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's Specification Features section. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements, and the device is validated for operation across −65 °C to +150 °C junction temperature, supporting under-hood and cabin electronics deployment.

What is the maximum power dissipation and thermal resistance of SZMM5Z3V0T1G?

SZMM5Z3V0T1G has a maximum steady-state power dissipation of 500 mW at 25 °C ambient temperature on an FR-4 board, derating linearly at 4.0 mW/°C above that. Its junction-to-ambient thermal resistance (R_JA) is 250 °C/W under the same conditions, enabling reliable operation without heatsinking in typical low-power portable and automotive subsystems.

Does SZMM5Z3V0T1G have ESD protection, and what level is rated?

SZMM5Z3V0T1G is rated for Class 3 ESD protection per Human Body Model (HBM) with >16 kV withstand capability. This is documented in the Specification Features section of the datasheet and eliminates the need for additional discrete ESD components in many consumer interface applications, including USB, audio jacks, and button inputs.

What package type and dimensions does SZMM5Z3V0T1G use?

SZMM5Z3V0T1G uses the SOD-523 package (Case 502), with physical dimensions of 1.20 mm × 0.80 mm × 0.70 mm. The cathode is marked by a polarity band on terminal 1, and the device supports reflow soldering up to 260 °C with MSL 1 moisture sensitivity level - confirmed in the Mechanical Characteristics and Package Dimensions sections of the datasheet.

SZMM5Z3V0T1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3 V

Tolerance:: ±7%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 10 µA @ 1 V

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

Operating Temperature:: -65°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-523

SZMM5Z3V0T1G FAQ

1.How can I place an order for SZMM5Z3V0T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMM5Z3V0T1G 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 SZMM5Z3V0T1G reliable?

The price and inventory of SZMM5Z3V0T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z3V0T1G is usually 5 days.

3.What payment methods are accepted for SZMM5Z3V0T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z3V0T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMM5Z3V0T1G?

SZMM5Z3V0T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMM5Z3V0T1G 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 SZMM5Z3V0T1G?

For technical support, including SZMM5Z3V0T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z3V0T1G requirements.

6.How does Aetrix verify that SZMM5Z3V0T1G is sourced from the original manufacturer or authorized distributors?

All SZMM5Z3V0T1G 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 SZMM5Z3V0T1G meets industry standards.

7.What is the process for return or replacement of SZMM5Z3V0T1G?

All SZMM5Z3V0T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z3V0T1G, 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 SZMM5Z3V0T1G part is unused and in its original packaging.

Return procedure for SZMM5Z3V0T1G:

1.Submit a request within 90 days.

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

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