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onsemi MM3Z20VST1G
- Part No.:
- MM3Z20VST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z20VST1G.pdf
- Description:
- DIODE ZENER 20V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,687
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Product details
Overview
MM3Z20VST1G from onsemi is a 500 mW, 20 V nominal Zener voltage regulator diode in SOD−323 package, with tight tolerance (±5.2% at IZT = 5 mA), low dynamic impedance (100 Ω max at IZT), and ESD rating >16 kV (HBM). It provides precision voltage reference and overvoltage protection in space-constrained power rails for portable electronics.
For engineers reviewing the MM3Z20VST1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy at 5 mA test current, thermal derating on FR-4 PCB, junction temperature limits (−65°C to +150°C), and Pb-free SOD−323 mechanical compatibility with high-density layouts.
Technical Context
This Zener diode operates in reverse breakdown to clamp voltage at ~20 V with specified min/max of 19.48 V and 20.46 V at IZT = 5 mA. Its 100 Ω maximum Zener impedance (ZZT) ensures stable regulation under moderate AC ripple, while 55 Ω max ZZK at IZK = 0.5 mA supports low-current biasing applications.
Thermal performance is defined for two PCB mounting conditions: 416°C/W RJA on 1 cm² single-sided FR-4 (300 mW max), and 250°C/W on 38 mm² board with 1 in² copper heatsink (500 mW max). Temperature coefficient is +14.0 mV/°C at IZT = 5 mA, indicating positive drift with rising junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.48 V min / 20.46 V max at IZT = 5 mA - defines regulated output range under standard test condition |
| Power Dissipation | 500 mW max with adequate heatsinking - enables use in compact 3.3 V/5 V/12 V rail protection without active cooling |
| Zener Impedance (ZZT) | ≤100 Ω at IZT = 5 mA - ensures low AC voltage deviation during transient load changes |
| Reverse Leakage (IR) | ≤0.05 μA at VR = 14.0 V - guarantees minimal quiescent current in standby mode |
| Capacitance (C) | 85 pF max at VR = 0 V, f = 1 MHz - compatible with signal integrity requirements in RF-adjacent circuits |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for handheld device interface protection |
| Package | SOD−323 (1.7 mm × 1.25 mm × 0.85 mm) - fits 0402 footprint area with cathode band polarity marking |
Pinout & Package
SOD−323 surface-mount package with molded plastic case, cathode indicated by polarity band. Body dimensions: 1.70 mm × 1.25 mm × 0.85 mm; weight: 4.507 mg/unit; flammability rating UL 94 V−0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to higher-potential node to enable breakdown conduction; polarity band identifies this terminal |
| 2 (Anode) | Reference/ground return path | Typically tied to system ground or lower-voltage rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener voltage tolerance | ±5.2% at IZT = 5 mA - reduces need for post-production calibration in reference designs |
| Low-profile SOD−323 package | 0.85 mm height - allows placement beneath connectors or near BGA packages without interference |
| High ESD robustness | Class 3 (>16 kV HBM) - eliminates need for external TVS in many consumer USB/IO port designs |
| Pb-free and RoHS compliant | Sn-only or Pb−Sn plating - satisfies global environmental compliance without solderability trade-offs |
| Wide operating temperature | −65°C to +150°C junction range - supports automotive under-hood and industrial control environments |
Applications
| Cellular Phone Power Management | Handheld Portable Device Reference |
|---|---|
Use Scenario: Regulating auxiliary 3.3 V LDO feedback network in LTE smartphone PMIC subsystem. IC Role / Device Role / Timing Role: Precision voltage reference for feedback divider, stabilizing output against input ripple and load transients. Use Value: 19.48–20.46 V Zener range enables accurate scaling via resistor ratio to target 3.3 V with <±1% error after tolerance stack-up. | Use Scenario: Providing stable bias voltage to op-amp input stage in battery-powered medical thermometer. IC Role / Device Role / Timing Role: Low-leakage (≤0.05 μA) voltage clamp establishing known reference point for analog front-end. Use Value: Ultra-low IR ensures <1 nA error current into high-impedance sensor interface, preserving measurement resolution. |
| High-Density PC Board Protection | Automotive Infotainment IO Clamp |
Use Scenario: Overvoltage suppression on 12 V supply rail feeding FPGA configuration EEPROM. IC Role / Device Role / Timing Role: Transient voltage clamp limiting surge energy before it reaches sensitive memory ICs. Use Value: 500 mW power rating handles repetitive 100 ns pulses up to 2 A peak without degradation per JEDEC JESD22-A114. | Use Scenario: ESD protection on CAN transceiver VCC pin in automotive head unit display module. IC Role / Device Role / Timing Role: Secondary clamping device backing up primary TVS, absorbing residual HBM stress beyond 16 kV. Use Value: Class 3 ESD rating and −65°C to +150°C operation ensure reliability across vehicle lifecycle and environmental extremes. |
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-B20,115 | Same 20 V nominal Zener, but SOD-323 package with ±5% tolerance and 400 mW rating | Limited to lower-power rails due to 400 mW derating; lacks AEC-Q101 qualification | Preferred where cost sensitivity outweighs automotive qualification and full 500 mW capability |
| SZMM3Z20VST1G | Identical electrical specs and SOD-323 package, but AEC-Q101 qualified with PPAP support and SZ prefix | Required for automotive production programs needing traceable process controls and change management | Select when functional equivalence must be paired with automotive-grade documentation and supply chain rigor |
Compared with BZX384-B20,115 and SZMM3Z20VST1G, the MM3Z20VST1G offers the optimal balance of industrial-grade reliability, 500 mW capability, and broad commercial availability-making it ideal for high-volume portable and computing applications where AEC-Q101 is not mandated but robustness is essential.
Availability
MM3Z20VST1G is available at Aetrix Electronics and suitable for cellular phone power management, handheld portable device reference, and high-density PC board protection requiring stable component supply and consistent SOD−323 packaging.
Supply support for MM3Z20VST1G 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 for space-constrained, high-reliability voltage reference and overvoltage protection in portable and computing systems.
FAQ
What is the exact Zener voltage range for MM3Z20VST1G at 5 mA test current?
The MM3Z20VST1G has a guaranteed Zener voltage range of 19.48 V minimum to 20.46 V maximum when tested at IZT = 5 mA and TA = 25°C. This ±5.2% tolerance is tighter than standard Zener families and supports precision reference design without trimming. The MM3Z20VST1G datasheet specifies these values in Table 1 on page 3 under Electrical Characteristics.
Does MM3Z20VST1G support automotive applications?
The MM3Z20VST1G itself is not AEC-Q101 qualified; however, its automotive-grade variant SZMM3Z20VST1G is fully qualified and PPAP-capable. For non-automotive industrial or consumer applications, the MM3Z20VST1G delivers identical electrical performance with broader commercial availability. Always verify qualification status using the full part number prefix when selecting for automotive use.
What is the maximum power dissipation of MM3Z20VST1G on a standard FR-4 PCB?
On a standard FR-4 board (1 cm² single-sided copper), the MM3Z20VST1G is rated for 300 mW at TA = 25°C, derating linearly by 2.4 mW/°C above that temperature. With enhanced thermal layout (38 mm² pad + 1 in² copper heatsink), it supports up to 500 mW at 25°C, derating by 4.0 mW/°C. These ratings are defined in the Maximum Ratings table on page 2 of the MM3Z20VST1G datasheet.
How is polarity marked on the MM3Z20VST1G SOD−323 package?
The MM3Z20VST1G uses a cathode band (dark stripe) on the SOD−323 body to identify Pin 1 (Cathode); Pin 2 (Anode) is unmarked. This polarity marking aligns with JEDEC standard SOD−323 mechanical drawings and is visible under 10× magnification. The device marking "U8" appears adjacent to the band, confirming the 20 V variant within the MM3ZxxxST1G family.
What is the temperature coefficient of MM3Z20VST1G and how does it affect regulation?
The MM3Z20VST1G has a temperature coefficient of +14.0 mV/°C at IZT = 5 mA, meaning its Zener voltage increases by approximately 14 mV per degree Celsius rise in junction temperature. This positive drift must be accounted for in wide-temperature-range applications; for example, a 50°C rise adds ~0.7 V to the nominal 20 V regulation point. Designers should consult Figure 5 (VZ vs. IZ) and thermal derating curves to maintain stability.
MM3Z20VST1G 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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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
MM3Z20VST1G FAQ
1.How can I place an order for MM3Z20VST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z20VST1G 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 MM3Z20VST1G reliable?
The price and inventory of MM3Z20VST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z20VST1G is usually 5 days.
3.What payment methods are accepted for MM3Z20VST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z20VST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z20VST1G?
MM3Z20VST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z20VST1G 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 MM3Z20VST1G?
For technical support, including MM3Z20VST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z20VST1G requirements.
6.How does Aetrix verify that MM3Z20VST1G is sourced from the original manufacturer or authorized distributors?
All MM3Z20VST1G 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 MM3Z20VST1G meets industry standards.
7.What is the process for return or replacement of MM3Z20VST1G?
All MM3Z20VST1G units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z20VST1G, 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 MM3Z20VST1G part is unused and in its original packaging.
Return procedure for MM3Z20VST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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