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onsemi MM3Z33VST1G
- Part No.:
- MM3Z33VST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z33VST1G.pdf
- Description:
- DIODE ZENER 33V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:24,478
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Product details
Overview
MM3Z33VST1G from onsemi is a 33 V ±3.5% tolerance Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation at 25°C, with 32.15–33.79 V nominal Zener voltage at 5 mA test current, 300 Ω max dynamic impedance, and 23.2 mV/°C temperature coefficient - used for precision voltage reference and overvoltage clamping in space-constrained portable electronics.
For engineers reviewing the MM3Z33VST1G datasheet, pinout, applications, or equivalent options, key selection criteria include its tight 3.3% VZ tolerance, low 0.9 V forward voltage at 10 mA, 16 kV HBM ESD rating, 70 pF capacitance at 0 V bias, and SOD−323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage regulation under varying load and temperature conditions. Its 5 mA test current and 300 Ω dynamic impedance at IZT ensure predictable clamping behavior, while the −65°C to +150°C junction temperature range supports industrial and automotive ambient operation.
The device features a cathode-band polarity indicator, Pb-free SOD−323 package (1.7 mm × 1.25 mm × 0.9 mm), and UL 94 V−0 flammability rating. It delivers 23.2 mV/°C temperature coefficient and 0.05 μA reverse leakage at 23.2 V, enabling stable reference performance across thermal gradients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.15–33.79 V at 5 mA - defines precise clamping threshold for 3.3 V rail protection or reference generation |
| Power Dissipation | 500 mW at 25°C - enables robust transient suppression without heatsinking in compact designs |
| Zener Impedance (ZZT) | ≤300 Ω at 5 mA - ensures minimal voltage shift under dynamic load changes |
| Temperature Coefficient | +23.2 mV/°C - quantifies VZ drift per degree, critical for temperature-stable references |
| Reverse Leakage (IR) | ≤0.05 μA at 23.2 V - guarantees low standby current in battery-powered systems |
| Capacitance (C) | 70 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV HBM) - provides built-in electrostatic discharge immunity for handheld interfaces |
Pinout & Package
SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.90 mm body, cathode indicated by polarity band, RoHS-compliant, UL 94 V−0 rated.
| 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 current path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Tight VZ tolerance (±3.5%) | Enables accurate voltage referencing without post-production trimming in portable power rails |
| Low 0.9 V forward voltage | Minimizes conduction loss in series-connected protection paths or bidirectional clamp configurations |
| 16 kV HBM ESD rating | Eliminates need for external ESD diodes in USB, audio jack, or button interface circuits |
| Small 1.7 mm × 1.25 mm footprint | Supports >2× higher component density vs. SOD-123 in multi-rail PMIC decoupling networks |
| AEC-Q101 qualified (SZ variant) | Validates reliability for automotive infotainment and ADAS sensor supply conditioning |
Applications
| Smartphone Power Management | USB-C Port Protection |
|---|---|
Use Scenario: Regulating auxiliary 3.3 V supply for camera module sensors and flash LED drivers. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting LDO input against transient surges. Use Value: Prevents sensor latch-up during hot-plug events using only 70 pF capacitance and 300 Ω dynamic impedance. | Use Scenario: Clamping CC line voltage during USB-C cable insertion and orientation detection. IC Role / Device Role / Timing Role: Bidirectional ESD and overvoltage protector on CC1/CC2 pins of USB-C receptacle. Use Value: Withstands 16 kV HBM strikes while maintaining <0.05 μA leakage to avoid false orientation detection. |
| Industrial IoT Sensor Node | Automotive Body Control Module |
Use Scenario: Providing stable 33 V reference for analog front-end ADC in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Precision voltage reference source with +23.2 mV/°C tempco compensated in firmware. Use Value: Enables ±0.5% reference accuracy over −40°C to +85°C without external compensation circuitry. | Use Scenario: Protecting LIN bus transceiver supply rail from load-dump transients in door module ECUs. IC Role / Device Role / Timing Role: Secondary clamping device downstream of TVS, absorbing residual energy after primary surge suppression. Use Value: Delivers 500 mW steady-state dissipation in 1.7 mm × 1.25 mm footprint, reducing board area vs. larger DO-214AC alternatives. |
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 | Same 33 V nominal VZ, but ±5% tolerance (vs. ±3.5%), 300 mW power rating, SOD-323 package | Higher VZ variation reduces reference accuracy in precision ADC biasing | Select when cost sensitivity outweighs 1.5% tighter tolerance requirement |
| MMSZ5261BT1G | 33 V nominal VZ, ±5% tolerance, 500 mW rating, SOD-123 package (2.7 mm × 1.6 mm) | Larger footprint increases PCB area by 130%, limiting use in ultra-thin mobile designs | Choose if existing SOD-123 layout reuse is prioritized over miniaturization |
Compared with BZX384-B33,115 and MMSZ5261BT1G, MM3Z33VST1G offers superior VZ tolerance and smallest footprint among 33 V Zeners, making it optimal for space-constrained, high-accuracy voltage reference and clamping where thermal derating above 25°C is managed via layout.
Availability
MM3Z33VST1G is available at Aetrix Electronics and suitable for smartphone power management, USB-C port protection, and industrial IoT sensor nodes requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MM3Z33VST1G 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 MM3ZxxxST1G series is part of onsemi's precision Zener voltage regulator portfolio, engineered specifically for space-constrained, high-reliability voltage reference and overvoltage protection in portable and automotive electronics.
FAQ
What is the exact Zener voltage range for MM3Z33VST1G at 5 mA test current?
The MM3Z33VST1G has a guaranteed Zener voltage range of 32.15 V to 33.79 V when tested at 5 mA (IZT) and 25°C ambient temperature, reflecting its ±3.5% tolerance specification. This range is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet. The MM3Z33VST1G maintains this performance across its qualified operating temperature range.
Is MM3Z33VST1G suitable for automotive applications?
Yes - the SZMM3Z33VST1G variant is AEC-Q101 qualified and PPAP capable, meeting automotive reliability requirements. While the standard MM3Z33VST1G shares identical electrical and mechanical specs, only the SZ-prefix version is certified for automotive use. Designers must specify SZMM3Z33VST1G for under-hood or safety-critical modules; the MM3Z33VST1G remains appropriate for consumer and industrial applications.
What is the maximum power dissipation of MM3Z33VST1G on a standard FR-4 PCB?
The MM3Z33VST1G delivers 500 mW maximum steady-state power dissipation on an FR-4 PCB with a 0.72 mm² mounting pad and 38 mm² copper heatsink (per Note 2 in the Maximum Ratings table). Without enhanced copper, its rating drops to 300 mW on a 1 cm² single-sided pad (Note 1). Derating is 4.0 mW/°C above 25°C under the higher-power condition.
Does MM3Z33VST1G have a defined forward voltage specification?
Yes - the MM3Z33VST1G specifies a maximum forward voltage (VF) of 0.9 V at 10 mA forward current (IF), consistent across all devices in the MM3ZxxxST1G series. This parameter is critical for evaluating conduction losses in bidirectional protection schemes or series-connected reference configurations where the diode may conduct in forward bias during fault conditions.
How is polarity identified on the MM3Z33VST1G SOD−323 package?
The MM3Z33VST1G uses a cathode-band marking system: Pin 1 (cathode) is identified by a visible polarity band near one end of the SOD−323 package body, while Pin 2 (anode) is the opposite, unmarked end. This marking aligns with JEDEC-standard SOD−323 orientation and is verified in the Mechanical Case Outline diagram (page 5) of the onsemi datasheet.
MM3Z33VST1G 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:
- ±2%
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
MM3Z33VST1G FAQ
1.How can I place an order for MM3Z33VST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z33VST1G 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 MM3Z33VST1G reliable?
The price and inventory of MM3Z33VST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z33VST1G is usually 5 days.
3.What payment methods are accepted for MM3Z33VST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z33VST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z33VST1G?
MM3Z33VST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z33VST1G 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 MM3Z33VST1G?
For technical support, including MM3Z33VST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z33VST1G requirements.
6.How does Aetrix verify that MM3Z33VST1G is sourced from the original manufacturer or authorized distributors?
All MM3Z33VST1G 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 MM3Z33VST1G meets industry standards.
7.What is the process for return or replacement of MM3Z33VST1G?
All MM3Z33VST1G units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z33VST1G, 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 MM3Z33VST1G part is unused and in its original packaging.
Return procedure for MM3Z33VST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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