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onsemi MM3Z4V3ST1
- Part No.:
- MM3Z4V3ST1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MM3Z4V3ST1.pdf
- Description:
- DIODE ZENER 4.3V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,344
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Product details
Overview
MM3Z4V3ST1 from onsemi is a 200 mW, 4.3 V nominal Zener voltage regulator diode in SOD−323 package, with ±2.5% tolerance (4.17–4.43 V at 5 mA), 90 Ω maximum dynamic impedance at IZT, and 3.0 µA maximum reverse leakage at 3.0 V. It provides precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the MM3Z4V3ST1 datasheet, pinout, applications, or equivalent options, key selection criteria include its tight Zener tolerance, low-profile SOD−323 footprint (1.7 × 1.25 × 0.9 mm), ESD robustness (>16 kV HBM), thermal resistance (635 °C/W), and compatibility with Pb-free reflow soldering (260 °C/10 s).
Technical Context
The MM3Z4V3ST1 operates as a two-terminal shunt voltage regulator, conducting in reverse breakdown to clamp voltage across a load. Its Zener mechanism delivers stable regulation at 5 mA test current, with temperature coefficient of −3.5 mV/°C and capacitance ≤450 pF at 0 V bias and 1 MHz.
Designed for low-power signal-level referencing and transient suppression, it features a cathode-band polarity indicator, void-free molded plastic case (UL 94 V−0), and specified operation from −65 °C to +150 °C junction temperature. Derating begins above 25 °C at 1.5 mW/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.17–4.43 V @ IZT = 5 mA - defines regulated output range under nominal bias |
| Power Dissipation (PD) | 200 mW @ TA = 25 °C - sets max continuous power handling on FR-5 board |
| Zener Impedance (ZZT) | ≤90 Ω @ IZT = 5 mA - determines AC regulation stability and ripple rejection |
| Reverse Leakage (IR) | ≤3.0 µA @ VR = 3.0 V - ensures minimal quiescent current in standby mode |
| Capacitance (C) | ≤450 pF @ VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability |
| ESD Rating | Class 3 (>16 kV) per HBM - supports robust handling in manual assembly and field environments |
| Package | SOD−323 (Case 477) - enables high-density placement on compact PCBs (1.7 × 1.25 mm body) |
Pinout & Package
SOD−323 surface-mount package: 2-pin, cathode-anode configuration, 0.9 mm height, Pb-free plating option available. Cathode identified by band marking.
| 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 circuit ground or lower-potential reference; completes shunt path |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener tolerance | ±2.5% (4.17–4.43 V) - reduces calibration overhead in precision reference designs |
| Low-profile SOD−323 | 1.7 × 1.25 × 0.9 mm - fits beneath connectors and in narrow board gaps |
| High ESD immunity | >16 kV HBM - eliminates need for external ESD protection in handheld interfaces |
| Pb-free compatible | Sn-only or Pb−Sn plating - meets RoHS and JEDEC J-STD-020 reflow requirements |
| Wide operating temperature | −65 °C to +150 °C - supports automotive under-hood and industrial control applications |
Applications
| Smartphone Power Rail Clamping | USB Interface Voltage Reference |
|---|---|
Use Scenario: Protecting 3.3 V I/O lines from transient overvoltage during hot-plug events in mobile handsets. IC Role / Device Role / Timing Role: Shunt clamping diode placed between VIO and GND to limit excursion beyond 4.3 V. Use Value: Prevents latch-up in baseband processors using its fast response and 3.0 µA leakage at 3.0 V. | Use Scenario: Providing stable 4.3 V reference for USB PHY biasing and termination detection circuits. IC Role / Device Role / Timing Role: Precision voltage reference source for analog comparators monitoring VBUS presence. Use Value: Enables accurate VBUS detection across temperature via ±2.5% VZ tolerance and −3.5 mV/°C TC. |
| Wearable Sensor Biasing | Industrial PLC Input Protection |
Use Scenario: Supplying regulated bias to MEMS accelerometer analog front-end in ultra-thin wearables. IC Role / Device Role / Timing Role: Low-power Zener reference replacing linear regulator where 200 mW dissipation suffices. Use Value: Reduces BOM count and board area using SOD−323 footprint and 450 pF capacitance for noise filtering. | Use Scenario: Protecting 24 V digital input channels from induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: First-stage clamping device before TVS and optocoupler isolation. Use Value: Absorbs repetitive low-energy transients without degradation, validated to 150 °C junction rating. |
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-B4V3,115 | Same 4.3 V nominal, ±2% tolerance, but 300 mW PD and SOD-323 package | Higher power margin allows use in higher-current bias networks | Select when >200 mW dissipation headroom is required; verify thermal layout for 300 mW |
| MMSZ4V3ET1G | Same 4.3 V nominal, ±5% tolerance, 500 mW PD, SOD-123 package (larger footprint) | Lower cost and wider availability, but looser tolerance and larger board area | Select for cost-sensitive industrial controls where ±5% VZ is acceptable and SOD-123 layout exists |
Compared with BZX384-B4V3,115 and MMSZ4V3ET1G, the MM3Z4V3ST1 offers tighter tolerance and smallest footprint among 4.3 V Zeners, making it optimal for high-density portable designs where precision and space are critical.
Availability
MM3Z4V3ST1 is available at Aetrix Electronics and suitable for smartphone power rail clamping, USB interface voltage reference, and wearable sensor biasing requiring stable component supply and consistent Zener voltage performance across production lots.
Supply support for MM3Z4V3ST1 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The MM3ZxxxST1 series targets space-constrained, low-power voltage regulation-designed specifically for portable consumer electronics, wearables, and high-density PCBs needing reliable, small-footprint Zener references.
FAQ
What is the Zener voltage tolerance of MM3Z4V3ST1?
The MM3Z4V3ST1 has a nominal Zener voltage of 4.3 V with a tolerance of ±2.5%, meaning its actual breakdown voltage falls between 4.17 V and 4.43 V when tested at 5 mA. This tight tolerance is specified per the onsemi datasheet Rev. 15 and enables precise voltage clamping without post-production trimming. The MM3Z4V3ST1 achieves this consistency through process-controlled doping and wafer-level screening.
Can MM3Z4V3ST1 be used in Pb-free reflow processes?
Yes, the MM3Z4V3ST1 supports Pb-free reflow soldering with a maximum peak temperature of 260 °C for 10 seconds, as confirmed in the mechanical characteristics section of the official datasheet. Its terminations are plated with Sn-only or Pb−Sn, and the package complies with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. The MM3Z4V3ST1 is also offered in Pb-free variants denoted by the "G" suffix (e.g., MM3Z4V3ST1G).
What is the maximum reverse leakage current for MM3Z4V3ST1?
The MM3Z4V3ST1 exhibits a maximum reverse leakage current (IR) of 3.0 µA when biased at 3.0 V, measured at 25 °C. This low leakage ensures minimal power loss in battery-powered applications such as wearables and remote sensors. The value is guaranteed across the full operating temperature range and directly impacts standby current budgeting in designs using the MM3Z4V3ST1 as a reference or clamp.
How does the temperature coefficient affect MM3Z4V3ST1 performance?
The MM3Z4V3ST1 has a temperature coefficient of −3.5 mV/°C at IZT = 5 mA, meaning its Zener voltage decreases by approximately 3.5 mV per degree Celsius rise in junction temperature. This negative TC is typical for Zeners below 5 V and must be accounted for in precision reference designs operating across wide ambient ranges. The MM3Z4V3ST1's TC is characterized and guaranteed in the datasheet's Electrical Characteristics table.
Is MM3Z4V3ST1 suitable for high-frequency noise suppression?
The MM3Z4V3ST1 has a maximum capacitance of 450 pF at 0 V bias and 1 MHz, making it suitable for suppressing low-to-mid frequency noise (e.g., switching ripple below ~10 MHz) but not ideal for GHz-range RF filtering. Its capacitance is stable across bias and temperature, supporting predictable decoupling behavior. For applications requiring both regulation and broadband suppression, the MM3Z4V3ST1 is often paired with ceramic capacitors-leveraging its inherent C-value while maintaining its primary role as a voltage clamp.
MM3Z4V3ST1 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):
- 4.3 V
- Tolerance:
- ±3%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
MM3Z4V3ST1 FAQ
1.How can I place an order for MM3Z4V3ST1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MM3Z4V3ST1 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 MM3Z4V3ST1 reliable?
The price and inventory of MM3Z4V3ST1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM3Z4V3ST1 is usually 5 days.
3.What payment methods are accepted for MM3Z4V3ST1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM3Z4V3ST1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM3Z4V3ST1?
MM3Z4V3ST1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM3Z4V3ST1 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 MM3Z4V3ST1?
For technical support, including MM3Z4V3ST1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM3Z4V3ST1 requirements.
6.How does Aetrix verify that MM3Z4V3ST1 is sourced from the original manufacturer or authorized distributors?
All MM3Z4V3ST1 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 MM3Z4V3ST1 meets industry standards.
7.What is the process for return or replacement of MM3Z4V3ST1?
All MM3Z4V3ST1 units undergo pre-shipment inspection (PSI). If there is an issue with MM3Z4V3ST1, 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 MM3Z4V3ST1 part is unused and in its original packaging.
Return procedure for MM3Z4V3ST1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MM3Z4V3ST1 Tags
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