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

onsemi SZMM3Z33VT1G

Name: SZMM3Z33VT1G
Brand: onsemi
SKU: SZMM3Z33VT1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZMM3Z33VT1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: SZMM3Z33VT1G.pdf

Description:: DIODE ZENER 33V 300MW SOD323

Quantity:: RFQ Add To RFQ list

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Inventory:5,931

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Product details

Overview

SZMM3Z33VT1G from onsemi is a 33 V, 300 mW Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained PCBs. It delivers nominal Zener voltage of 33 V at 2 mA test current, with ±6% tolerance (31–35 V), dynamic impedance of 80 Ω at IZT, and leakage current ≤0.05 μA at 23.2 V reverse bias - used in portable power rails and ESD-sensitive signal conditioning.

For engineers reviewing the SZMM3Z33VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC−Q101 qualification, 16 kV HBM ESD rating, low 0.9 mm profile, and tight 33 V regulation for battery monitoring and LDO feedback networks.

Technical Context

This device operates as a two-terminal, unidirectional voltage reference, conducting in reverse breakdown to clamp or regulate voltage. Its Zener mechanism provides stable DC reference under low-current conditions (IZT = 2 mA), with temperature coefficient of +27.4 mV/°C and capacitance of 70 pF at 0 V bias and 1 MHz.

Designed for surface-mount use on FR−4 boards, it features Pb−free plating, UL 94 V−0 flammability rating, and 260°C soldering tolerance. The cathode-anode polarity is marked by a band, and thermal resistance is 416°C/W junction-to-ambient under standard mounting conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	33 V nominal, 31–35 V range at I_ZT = 2 mA - defines clamping threshold for overvoltage protection circuits
Power Dissipation	300 mW at T_A = 25°C - supports continuous regulation in low-power sensor nodes and bias networks
Zener Impedance (Z_ZT)	80 Ω max at I_ZT = 2 mA - determines output voltage stability under load transients
Leakage Current (I_R)	≤0.05 μA at V_R = 23.2 V - ensures minimal quiescent current in battery-backed systems
ESD Rating	Class 3 (>16 kV) per HBM - enables direct placement on I/O lines without external ESD protection
Package	SOD−323 (1.7 × 1.25 × 0.9 mm) - fits high-density layouts in smartphones and wearables
Temperature Coefficient	+27.4 mV/°C - quantifies V_Z drift across operating temperature range

Pinout & Package

SOD−323 package: ultra-compact surface-mount outline (1.7 mm × 1.25 mm × 0.9 mm), cathode-indicated by band, void-free molded plastic case rated UL 94 V−0.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to regulated output or voltage reference node; reverse-biased during Zener operation
2 (Non-banded End)	Anode	Connected to ground or lower-potential rail; completes conduction path during breakdown

Key Features

Feature	Design Value
AEC−Q101 Qualified	Validated for automotive electronics including infotainment power supplies and body control modules
16 kV HBM ESD Robustness	Eliminates need for discrete TVS diodes in USB, audio jack, and button interface protection
Low 0.9 mm Height	Enables stacking under shields or placement beneath connectors in slim mobile designs
Pb−Free & RoHS Compliant	Meets global environmental compliance requirements without compromising solder joint reliability
Stable 33 V Reference	Supports accurate ADC reference scaling and comparator trip-point setting in 3.3 V/5 V systems

Applications

Battery Voltage Monitoring	USB Port Overvoltage Protection
Use Scenario: Monitoring Li-ion cell voltage in portable medical devices to trigger low-battery alerts before shutdown. IC Role / Device Role / Timing Role: Precision 33 V Zener reference feeding into an analog comparator input for threshold detection. Use Value: Tight 31–35 V tolerance ensures consistent alert timing across production units and temperature ranges.	Use Scenario: Protecting downstream USB data lines from accidental 12 V adapter misconnection in dual-input power banks. IC Role / Device Role / Timing Role: Clamping transient overvoltage on VBUS line to prevent damage to USB controller ICs. Use Value: 300 mW power rating sustains short-duration surges while 80 Ω Z_ZT limits clamping voltage overshoot.
LDO Feedback Network	Industrial Sensor Signal Conditioning
Use Scenario: Setting output voltage of adjustable LDOs in factory automation controllers requiring 3.3 V ±1% accuracy. IC Role / Device Role / Timing Role: Providing stable reference voltage to LDO feedback divider network. Use Value: Low 0.05 μA leakage minimizes divider current error, preserving regulation accuracy.	Use Scenario: Biasing photodiode amplifiers in optical smoke detectors where supply rails vary between 3.0–3.6 V. IC Role / Device Role / Timing Role: Generating stable 33 V virtual ground for op-amp rail-splitting in single-supply front-end stages. Use Value: 70 pF capacitance avoids phase margin degradation in high-gain transimpedance amplifier loops.

Battery Voltage Monitoring

USB Port Overvoltage Protection

Use Scenario: Monitoring Li-ion cell voltage in portable medical devices to trigger low-battery alerts before shutdown.

IC Role / Device Role / Timing Role: Precision 33 V Zener reference feeding into an analog comparator input for threshold detection.

Use Value: Tight 31–35 V tolerance ensures consistent alert timing across production units and temperature ranges.

Use Scenario: Protecting downstream USB data lines from accidental 12 V adapter misconnection in dual-input power banks.

IC Role / Device Role / Timing Role: Clamping transient overvoltage on VBUS line to prevent damage to USB controller ICs.

Use Value: 300 mW power rating sustains short-duration surges while 80 Ω Z_ZT limits clamping voltage overshoot.

LDO Feedback Network

Industrial Sensor Signal Conditioning

Use Scenario: Setting output voltage of adjustable LDOs in factory automation controllers requiring 3.3 V ±1% accuracy.

IC Role / Device Role / Timing Role: Providing stable reference voltage to LDO feedback divider network.

Use Value: Low 0.05 μA leakage minimizes divider current error, preserving regulation accuracy.

Use Scenario: Biasing photodiode amplifiers in optical smoke detectors where supply rails vary between 3.0–3.6 V.

IC Role / Device Role / Timing Role: Generating stable 33 V virtual ground for op-amp rail-splitting in single-supply front-end stages.

Use Value: 70 pF capacitance avoids phase margin degradation in high-gain transimpedance amplifier loops.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX384-B33,115	33 V, 300 mW, SOD-323, but ±5% tolerance (31.4–34.7 V); 90 Ω Z_ZT; no AEC-Q101 rating	Targeted at commercial-grade consumer electronics, not automotive or industrial environments	Select when cost sensitivity outweighs automotive qualification and tighter leakage specs
MMSZ5260ET1G	33 V, 500 mW, SOD-123; ±5% tolerance; 30 Ω Z_ZT; 100 nA leakage at 25 V; AEC-Q101 qualified	Higher power handling and lower impedance suit higher-current bias networks, but larger footprint	Choose when board space allows SOD-123 and lower dynamic impedance is critical for noise-sensitive references

Compared with BZX384-B33,115 and MMSZ5260ET1G, SZMM3Z33VT1G offers the narrowest leakage (0.05 μA), smallest footprint (SOD−323), and automotive qualification - making it optimal for space-constrained, safety-aware designs where ultra-low standby current matters.

Availability

SZMM3Z33VT1G is available at Aetrix Electronics and suitable for battery management systems, USB-C port protection, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and AEC−Q101 compliance.

Supply support for SZMM3Z33VT1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMM3Z33VT1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G family - engineered for high-reliability voltage reference and protection in miniaturized, ESD-prone electronic systems.

FAQ

What is the Zener voltage tolerance of SZMM3Z33VT1G?

The SZMM3Z33VT1G has a nominal Zener voltage of 33 V with a tolerance of ±6%, meaning the actual measured voltage falls between 31 V and 35 V at I_ZT = 2 mA and T_A = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official datasheet, and applies directly to the SZMM3Z33VT1G variant.

Is SZMM3Z33VT1G suitable for automotive applications?

Yes, SZMM3Z33VT1G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the "Specification Features" section of the datasheet. The "SZ" prefix denotes compliance with automotive-specific site and control change requirements, making SZMM3Z33VT1G appropriate for engine control units, ADAS sensors, and infotainment power rails.

What is the maximum reverse leakage current for SZMM3Z33VT1G?

The maximum reverse leakage current for SZMM3Z33VT1G is 0.05 μA at V_R = 23.2 V and T_A = 25°C, per the Electrical Characteristics table. This ultra-low leakage supports extended battery life in always-on monitoring circuits and preserves accuracy in high-impedance reference networks.

Does SZMM3Z33VT1G have a defined forward voltage specification?

Yes - the datasheet specifies V_F ≤ 0.9 V at I_F = 10 mA for all devices in the series, including SZMM3Z33VT1G. This forward voltage is relevant when the diode is used in polarity-protection configurations or during power-up sequencing where forward conduction may occur.

What is the thermal resistance (R_JA) of SZMM3Z33VT1G?

The junction-to-ambient thermal resistance of SZMM3Z33VT1G is 416°C/W when mounted on a single-sided FR−4 board with a 1 cm² copper pad, as specified in the Maximum Ratings table. This value governs power derating above 25°C and must be applied in thermal design for sustained 300 mW operation.

SZMM3Z33VT1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-76, SOD-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±6%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 23.2 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-323

SZMM3Z33VT1G FAQ

1.How can I place an order for SZMM3Z33VT1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZMM3Z33VT1G 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 SZMM3Z33VT1G reliable?

The price and inventory of SZMM3Z33VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z33VT1G is usually 5 days.

3.What payment methods are accepted for SZMM3Z33VT1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z33VT1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZMM3Z33VT1G?

SZMM3Z33VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZMM3Z33VT1G 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 SZMM3Z33VT1G?

For technical support, including SZMM3Z33VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z33VT1G requirements.

6.How does Aetrix verify that SZMM3Z33VT1G is sourced from the original manufacturer or authorized distributors?

All SZMM3Z33VT1G 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 SZMM3Z33VT1G meets industry standards.

7.What is the process for return or replacement of SZMM3Z33VT1G?

All SZMM3Z33VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z33VT1G, 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 SZMM3Z33VT1G part is unused and in its original packaging.

Return procedure for SZMM3Z33VT1G:

1.Submit a request within 90 days.

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

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