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onsemi SZMM3Z3V3ST3G
- Part No.:
- SZMM3Z3V3ST3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z3V3ST3G.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,161
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Product details
Overview
SZMM3Z3V3ST3G from onsemi is a 3.3 V ±3% tolerance Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation, with 95 Ω max dynamic impedance at 5 mA test current and 5.0 μA max reverse leakage at 1.0 V, used for precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM3Z3V3ST3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±3%), thermal resistance (250 °C/W on optimized PCB), ESD rating (>16 kV HBM), and AEC−Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at 3.32–3.53 V under 5 mA test current. Its low 0.9 V forward voltage at 10 mA enables bidirectional clamping when paired with series components.
The SOD−323 package supports high-density mounting with 1.7 mm × 1.25 mm footprint and 0.9 mm height, while its Pb−free, RoHS-compliant construction and Class 3 ESD rating (>16 kV HBM) meet stringent requirements for handheld and automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.32–3.53 V at IZT = 5 mA - defines precise regulation window for 3.3 V rail stabilization |
| Tolerance | ±3% - ensures tight output voltage consistency across production lots |
| Power Dissipation | 500 mW - supports robust transient energy absorption without derating on heatsinked PCB |
| Zener Impedance (ZZT) | ≤95 Ω at IZT = 5 mA - maintains stable regulation under varying load current |
| Reverse Leakage (IR) | ≤5.0 μA at VR = 1.0 V - minimizes standby power loss in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and system-level electrostatic discharge events |
| AEC−Q101 Qualified | Yes - validated for automotive applications including infotainment and body control modules |
Pinout & Package
SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.85 mm body, cathode indicated by polarity band, mounted in any orientation, compatible with standard reflow profiles (260°C for 10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Tight VZ tolerance | ±3% ensures predictable clamping threshold without post-production trimming |
| Low-profile SOD−323 | 0.9 mm height enables use in ultra-thin mobile devices and stacked PCB assemblies |
| AEC−Q101 qualification | Validated reliability for automotive subsystems operating across −40°C to +125°C ambient |
| Pb−free & RoHS compliant | Meets global environmental regulations and eliminates lead contamination risk in recycling streams |
| High ESD immunity | Class 3 (>16 kV HBM) reduces need for external ESD protection in front-end interfaces |
Applications
| Smartphone Power Rail Protection | Automotive Infotainment USB Port Clamp |
|---|---|
Use Scenario: Protecting 3.3 V I/O rails in smartphone application processors from ESD transients and supply overshoot. IC Role / Device Role / Timing Role: Zener clamping diode placed between rail and ground to shunt excess energy during fast transients. Use Value: ±3% VZ tolerance ensures clamping occurs precisely within safe margin of 3.3 V logic threshold, preventing false resets or latch-up. | Use Scenario: Safeguarding USB data lines and VBUS monitoring circuits in automotive head units exposed to load-dump and jump-start conditions. IC Role / Device Role / Timing Role: Standby voltage reference and overvoltage limiter integrated into USB interface protection network. Use Value: AEC−Q101 qualification and 500 mW power rating enable reliable operation under automotive temperature cycling and surge stress. |
| Wearable Sensor Node Reference | Industrial PLC Digital Input Conditioning |
Use Scenario: Providing stable 3.3 V reference for ADC biasing and sensor excitation in compact wearable health monitors. IC Role / Device Role / Timing Role: Precision voltage reference source for analog signal chain calibration and offset correction. Use Value: Low 95 Ω ZZT minimizes voltage shift under varying sensor loading, preserving measurement accuracy. | Use Scenario: Level-shifting and transient suppression for 24 V digital inputs interfaced to 3.3 V microcontrollers in factory automation controllers. IC Role / Device Role / Timing Role: Bidirectional clamp (with series resistor) limiting input voltage to safe range for MCU GPIO pins. Use Value: 0.9 V forward voltage allows effective low-side clamping during negative transients without additional diodes. |
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-B3V3,115 (Nexperia) | Same 3.3 V nominal VZ, ±2% tolerance, 300 mW rating, SOD-323 package | Limited to non-automotive industrial use; not AEC−Q101 qualified | Select when cost sensitivity outweighs automotive qualification requirement |
| MMSZ4675T1G (onsemi) | 3.3 V nominal VZ, ±5% tolerance, 500 mW rating, SOD-123 package (larger footprint) | Higher tolerance and larger 3.7 mm × 1.6 mm package limits high-density layouts | Select when board space permits larger package and ±5% tolerance is acceptable |
Compared with BZX384-B3V3,115 and MMSZ4675T1G, SZMM3Z3V3ST3G delivers tighter ±3% regulation, AEC−Q101 compliance, and smallest footprint-making it optimal for automotive and portable designs where precision, reliability, and miniaturization are critical.
Availability
SZMM3Z3V3ST3G is available at Aetrix Electronics and suitable for smartphone power rail protection, automotive infotainment USB port clamp, and wearable sensor node reference requiring stable component supply and long-term manufacturing continuity.
Supply support for SZMM3Z3V3ST3G 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 MM3Z/SZMM3Z series was designed specifically for high-reliability, space-constrained voltage regulation-targeting portable electronics, automotive subsystems, and industrial sensors needing precision Zener performance in minimal footprint.
FAQ
What is the exact Zener voltage range specified for SZMM3Z3V3ST3G?
The SZMM3Z3V3ST3G has a guaranteed Zener voltage range of 3.32 V to 3.53 V at a test current of 5 mA, corresponding to a ±3% tolerance around the nominal 3.3 V rating. This specification is measured and verified per onsemi's datasheet Rev. 27 (March 2025), and applies under standard conditions of TA = 25°C. The SZMM3Z3V3ST3G maintains this range across its qualified operating temperature span.
Is SZMM3Z3V3ST3G suitable for automotive applications?
Yes, SZMM3Z3V3ST3G is AEC−Q101 qualified and PPAP capable, with validation for operation across −40°C to +150°C junction temperature. Its construction meets automotive reliability standards, including enhanced ESD immunity (>16 kV HBM) and Pb−free/RoHS compliance. The SZMM3Z3V3ST3G is explicitly designated for automotive and other applications requiring unique site and control change requirements, as indicated by the "SZ" prefix.
What is the maximum power dissipation and thermal resistance of SZMM3Z3V3ST3G?
SZMM3Z3V3ST3G has a steady-state power rating of 500 mW on an FR−4 PCB with 38 mm² copper heatsink (Note 2). Its thermal resistance from junction-to-ambient is 250 °C/W under that condition. Derating begins above 25°C at 4.0 mW/°C. These values are confirmed in the Maximum Ratings table of the official onsemi datasheet for SZMM3Z3V3ST3G.
Does SZMM3Z3V3ST3G have a defined forward voltage characteristic?
Yes, SZMM3Z3V3ST3G specifies a maximum forward voltage (VF) of 0.9 V at a forward current (IF) of 10 mA, per the Electrical Characteristics table. This low VF enables effective bidirectional clamping when used with a series resistor, and supports use in low-voltage signal conditioning circuits. The SZMM3Z3V3ST3G's forward behavior is fully characterized and consistent across production lots.
How is polarity marked on the SZMM3Z3V3ST3G SOD−323 package?
The SZMM3Z3V3ST3G uses Style 1 marking: the cathode is identified by a visible polarity band at Pin 1 (banded end), and the anode is at Pin 2 (non-banded end). This marking aligns with JEDEC-standard SOD−323 orientation and is confirmed in the Mechanical Case Outline diagram (Issue K, 11 MAR 2024) and Marking Diagram section of the onsemi datasheet for SZMM3Z3V3ST3G.
SZMM3Z3V3ST3G 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):
- 3.3 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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-323
SZMM3Z3V3ST3G FAQ
1.How can I place an order for SZMM3Z3V3ST3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z3V3ST3G 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 SZMM3Z3V3ST3G reliable?
The price and inventory of SZMM3Z3V3ST3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z3V3ST3G is usually 5 days.
3.What payment methods are accepted for SZMM3Z3V3ST3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z3V3ST3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z3V3ST3G?
SZMM3Z3V3ST3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z3V3ST3G 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 SZMM3Z3V3ST3G?
For technical support, including SZMM3Z3V3ST3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z3V3ST3G requirements.
6.How does Aetrix verify that SZMM3Z3V3ST3G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z3V3ST3G 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 SZMM3Z3V3ST3G meets industry standards.
7.What is the process for return or replacement of SZMM3Z3V3ST3G?
All SZMM3Z3V3ST3G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z3V3ST3G, 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 SZMM3Z3V3ST3G part is unused and in its original packaging.
Return procedure for SZMM3Z3V3ST3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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