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onsemi MM3Z39VST1G
- Part No.:
- MM3Z39VST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z39VST1G.pdf
- Description:
- DIODE ZENER 39V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,318
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Product details
Overview
MM3Z39VST1G from onsemi is a 39 V ±3.9% Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation, 2 mA test current, and 45 pF capacitance at 0 V/1 MHz - used for precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the MM3Z39VST1G datasheet, pinout, applications, or equivalent options, key selection criteria include its tight 3.9% Zener tolerance, low 0.05 μA leakage at 30.8 V, 27.3 mV/°C temperature coefficient, and AEC−Q101 qualification readiness via SZ-prefix variants.
Technical Context
This device operates as a two-terminal reverse-biased voltage regulator with nominal Zener voltage of 39.0 V at 2 mA (IZT), exhibiting 130 Ω dynamic impedance (ZZT) and 500 Ω knee impedance (ZZK) at 0.5 mA. Its thermal resistance is 250 °C/W under optimized PCB heatsinking (38 mm² copper).
The MM3Z39VST1G features Class 3 ESD robustness (>16 kV HBM), Pb-free/RoHS-compliant construction, and UL 94 V−0 flammability rating - all within a 1.7 mm × 1.25 mm × 0.9 mm SOD−323 footprint suitable for high-density layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 38.22 V to 39.78 V at IZT = 2 mA - defines stable regulation window for feedback or clamping circuits |
| Power Dissipation (PD) | 500 mW max on FR-4 with 38 mm² copper heatsink - enables compact 39 V rail protection without external heat sinking |
| Zener Impedance (ZZT) | 130 Ω at IZT = 2 mA - limits output voltage variation under load transients in reference applications |
| Leakage Current (IR) | 0.05 μA max at VR = 30.8 V - ensures minimal standby power loss in battery-powered systems |
| Capacitance (C) | 45 pF max at VR = 0 V, f = 1 MHz - preserves signal integrity in RF-coupled or high-speed sensing paths |
| Temp. Coefficient (dVZ/dT) | +33.4 mV/°C at IZT = 5 mA - quantifies voltage drift across industrial temperature range (−65°C to +150°C) |
Pinout & Package
SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.90 mm body, cathode indicated by polarity band, Pb-free Sn plating, UL 94 V−0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential rail; completes bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener tolerance | ±3.9% at 39 V - reduces calibration overhead in precision analog front-ends |
| Low-profile SOD−323 | 0.9 mm height - fits beneath low-clearance shields and stacked PCB assemblies |
| High ESD immunity | Class 3 (>16 kV HBM) - withstands handling and system-level ESD events without derating |
| Automotive-ready variant path | SZMM3Z39VST1G available - supports AEC−Q101 qualification and PPAP documentation |
Applications
| Cellular Phone Power Management | USB-C Port Protection |
|---|---|
Use Scenario: Regulating auxiliary 3.3 V LDO feedback or clamping USB D+/D− lines against ESD-induced overvoltage. IC Role / Device Role / Timing Role: Zener diode providing shunt-based voltage clamp and reference stabilization. Use Value: 45 pF capacitance avoids signal distortion on 480 Mbps USB 2.0 data lines while maintaining 39 V standoff. | Use Scenario: Protecting USB-C CC logic pins from transient surges during hot-plug events. IC Role / Device Role / Timing Role: Standoff diode limiting voltage excursion to safe levels before TVS activation. Use Value: 0.05 μA leakage at 30.8 V prevents false detection in 5 V CC line monitoring circuits. |
| Industrial Sensor Signal Conditioning | Medical Wearable Battery Monitoring |
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric ADC biasing. Use Value: ±3.9% tolerance and +33.4 mV/°C TC enable <±1% total error over −40°C to +85°C without trimming. | Use Scenario: Monitoring Li-ion cell voltage thresholds in compact hearables with integrated fuel gauging. IC Role / Device Role / Timing Role: Overvoltage clamp on charger input path to prevent IC damage during adapter fault conditions. Use Value: 500 mW power rating sustains 39 V clamping for >100 ms during 12 V adapter short-circuit events. |
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-B39,115 | 39 V ±5%, 300 mW rating, SOD-323, 90 pF capacitance | Higher leakage (0.1 μA @ 31.2 V), wider tolerance - less suitable for precision references | Select when cost sensitivity outweighs tight regulation needs and board space allows same footprint |
| MMSZ4702T1G | 39 V ±5%, 500 mW, SOD-123, 1.5 mm × 1.25 mm × 1.0 mm | Larger package (SOD-123), higher profile (1.0 mm), identical electrical specs except 50 pF C | Choose if existing layout uses SOD-123 or requires higher mechanical robustness in vibration-prone environments |
Compared with BZX384-B39,115 and MMSZ4702T1G, the MM3Z39VST1G delivers tighter 3.9% tolerance and lower 45 pF capacitance in the smallest SOD−323 form factor - making it optimal for high-density, precision-clamp designs where layout area and signal integrity are critical.
Availability
MM3Z39VST1G is available at Aetrix Electronics and suitable for cellular phone power management, USB-C port protection, and industrial sensor signal conditioning requiring stable component supply and consistent parametric performance across production lots.
Supply support for MM3Z39VST1G 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 targets space-constrained, high-reliability voltage regulation - designed specifically for portable electronics, wearables, and automotive subsystems needing tight-tolerance, low-capacitance Zener clamping in ultra-small packages.
FAQ
What is the Zener voltage tolerance of the MM3Z39VST1G?
The MM3Z39VST1G has a Zener voltage tolerance of ±3.9% at 39.0 V, specified as 38.22 V minimum to 39.78 V maximum under IZT = 2 mA test conditions. This tight tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and enables reduced calibration effort in precision analog circuits where the MM3Z39VST1G serves as a reference or clamp element.
Is the MM3Z39VST1G RoHS compliant and lead-free?
Yes, the MM3Z39VST1G is Pb-free, halogen-free/BFR-free, and RoHS compliant, as explicitly stated in the "Specification Features" section of the onsemi datasheet. The "G" suffix in the part number denotes the Pb-free package, and the device carries UL 94 V−0 flammability rating with corrosion-resistant finish on all external surfaces - confirming full compliance for modern electronics manufacturing.
What is the maximum power dissipation capability of the MM3Z39VST1G?
The MM3Z39VST1G supports up to 500 mW steady-state power dissipation when mounted on an FR-4 PCB with a 38 mm² copper heatsink (per Note 2 in the Maximum Ratings table). Its thermal resistance is 250 °C/W under this condition, allowing reliable operation at full power across the industrial temperature range without external heatsinking - a key advantage over lower-rated Zeners like the 300 mW BZX384 series.
Does the MM3Z39VST1G have automotive qualification?
The MM3Z39VST1G itself is not AEC−Q101 qualified, but its SZMM3Z39VST1G variant is explicitly designated for automotive and other applications requiring unique site and control change requirements, with AEC−Q101 qualification and PPAP capability. Engineers selecting the MM3Z39VST1G for non-automotive use can migrate to the SZ prefix version when automotive-grade reliability and documentation are required.
What is the reverse leakage current specification for the MM3Z39VST1G?
The MM3Z39VST1G specifies a maximum reverse leakage current (IR) of 0.05 μA at VR = 30.8 V (80% of nominal Zener voltage), per the Electrical Characteristics table. This ultra-low leakage minimizes standby power draw in battery-powered devices and prevents false triggering in high-impedance monitoring circuits where the MM3Z39VST1G is deployed for voltage clamping or reference functions.
MM3Z39VST1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- -
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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
MM3Z39VST1G FAQ
1.How can I place an order for MM3Z39VST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z39VST1G 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 MM3Z39VST1G reliable?
The price and inventory of MM3Z39VST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z39VST1G is usually 5 days.
3.What payment methods are accepted for MM3Z39VST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z39VST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z39VST1G?
MM3Z39VST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z39VST1G 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 MM3Z39VST1G?
For technical support, including MM3Z39VST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z39VST1G requirements.
6.How does Aetrix verify that MM3Z39VST1G is sourced from the original manufacturer or authorized distributors?
All MM3Z39VST1G 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 MM3Z39VST1G meets industry standards.
7.What is the process for return or replacement of MM3Z39VST1G?
All MM3Z39VST1G units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z39VST1G, 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 MM3Z39VST1G part is unused and in its original packaging.
Return procedure for MM3Z39VST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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