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onsemi MM5Z3V9T1G
- Part No.:
- MM5Z3V9T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
MM5Z3V9T1G.pdf
- Description:
- DIODE ZENER 3.9V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,115
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Product details
Overview
MM5Z3V9T1G from onsemi is a 3.9 V ±5% Zener diode in SOD-523 package, rated for 500 mW steady-state power dissipation, 90 Ω max Zener impedance at 5 mA test current, and 3 µA max reverse leakage at 3 V. It provides precision voltage regulation and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the MM5Z3V9T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.9 V nominal Zener voltage with ±5% tolerance, 500 mW power rating on FR-4 board, 90 Ω dynamic impedance at IZT = 5 mA, Class 3 ESD rating (>16 kV HBM), and SOD-523 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at ~3.9 V when reverse-biased above its Zener threshold. Its low 0.7 mm body height and 1.20 mm × 0.80 mm outline enable integration into ultra-thin mobile handsets and wearables.
Thermal derating follows a linear 4.0 mW/°C reduction above 25 °C ambient, with junction-to-ambient thermal resistance of 250 °C/W on FR-4 board. The 100% matte tin lead finish supports Pb-free reflow up to 260 °C and meets MSL 1 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V - stable regulation point under 5 mA test current, with min/max range 3.7–4.2 V at 25 °C |
| Power Dissipation | 500 mW - maximum continuous power on FR-4 board at 25 °C; requires derating above that temperature |
| Zener Impedance | 90 Ω max at IZT = 5 mA - defines voltage stability under varying load current |
| Reverse Leakage | 3 µA max at VR = 3 V - ensures minimal standby current in voltage-sense or clamping circuits |
| ESD Rating | Class 3 (>16 kV HBM) - protects against electrostatic discharge during handling and assembly |
| Package | SOD-523 (Case 502) - 1.20 mm × 0.80 mm × 0.70 mm surface-mount outline for high-density PCBs |
| Operating Temp | −65 °C to +150 °C - supports industrial and automotive ambient conditions |
Pinout & Package
SOD-523 package: ultra-compact 2-pin surface-mount case with cathode marked by polarity band (Pin 1), anode unmarked (Pin 2); 100% matte Sn finish, MSL 1, reflow-compatible to 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-bias voltage applied here to initiate Zener conduction |
| 2 (Unmarked End) | Anode | Connected to circuit ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Precision Zener voltage | 3.9 V ±5% tolerance enables accurate 3.3 V rail clamping and reference generation |
| Low-profile packaging | 0.7 mm height allows use in <1.0 mm total thickness assemblies such as slim smartphones and IoT sensors |
| High ESD robustness | Class 3 HBM (>16 kV) eliminates need for external ESD protection in handheld interface lines |
| Pb-free & RoHS compliant | 100% matte tin terminations meet global environmental compliance without solderability compromise |
| Stable thermal performance | 250 °C/W RJA on FR-4 enables predictable thermal design in thermally isolated pads |
Applications
| Battery Protection Circuit | USB Interface Clamp |
|---|---|
Use Scenario: Protecting lithium-ion battery monitor ICs from transient overvoltage during charging cycles. IC Role / Device Role / Timing Role: Zener clamping element limiting sensed voltage to ≤4.2 V to prevent ADC saturation or fault triggering. Use Value: 3.9 V nominal breakdown ensures headroom below 4.2 V battery max while maintaining margin against tolerance drift. | Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) against ESD events and bus overvoltage. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between signal line and ground. Use Value: 90 Ω Zener impedance and Class 3 ESD rating provide fast, low-clamp-voltage response without signal distortion. |
| Low-Power Sensor Reference | Microcontroller Reset Supervisor |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers in wearable health sensors. IC Role / Device Role / Timing Role: Passive voltage reference source for op-amp biasing and ADC reference scaling. Use Value: Tight ±5% tolerance and low 3 µA leakage minimize quiescent current draw and reference error in sub-100 µA systems. | Use Scenario: Monitoring 3.3 V supply rail to assert reset signal if voltage drops below safe operating level. IC Role / Device Role / Timing Role: Threshold-detection element feeding comparator input in discrete reset circuit. Use Value: 3.9 V Zener voltage allows reliable detection of 3.3 V rail collapse with sufficient noise margin and hysteresis design flexibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C3V9 | Same 3.9 V nominal, ±5% tolerance, but SOD-323 package (1.7 × 1.3 mm); 350 mW power rating | Larger footprint and lower power limit reduce suitability for ultra-dense layouts requiring SOD-523 | Select BZX584-C3V9 only if board area permits larger package and thermal budget allows 350 mW max |
| MM3Z3V9T1G | Identical electrical specs but in SOD-323 package; same 500 mW rating, 90 Ω ZZT, and marking "AJ" | SOD-323 footprint incompatible with SOD-523 land pattern; requires PCB redesign | Choose MM3Z3V9T1G only when SOD-323 is already standardized in the design and layout change is acceptable |
Compared with BZX584-C3V9 and MM3Z3V9T1G, the MM5Z3V9T1G delivers identical Zener performance in the smallest standard footprint (SOD-523), enabling higher component density without sacrificing regulation accuracy or thermal capability.
Availability
MM5Z3V9T1G is available at Aetrix Electronics and suitable for battery protection circuits, USB interface clamps, low-power sensor references, microcontroller reset supervisors, and high-density portable electronics requiring stable component supply and consistent parametric performance.
Supply support for MM5Z3V9T1G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MM5ZxxxT1G series is designed specifically for compact, high-reliability voltage regulation in space-constrained portable electronics, emphasizing low profile, high ESD immunity, and tight Zener tolerance in the SOD-523 package.
FAQ
What is the nominal Zener voltage and tolerance of the MM5Z3V9T1G?
The MM5Z3V9T1G has a nominal Zener voltage of 3.9 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 3.7 V and 4.2 V at 25 °C and 5 mA test current. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 19, April 2025). The MM5Z3V9T1G maintains this specification across its qualified operating temperature range.
What package type and dimensions does the MM5Z3V9T1G use?
The MM5Z3V9T1G uses the SOD-523 package (Case 502), measuring 1.20 mm × 0.80 mm × 0.70 mm. Its compact size and low 0.7 mm height make it ideal for ultra-thin portable devices. The cathode is marked by a polarity band on Pin 1, and the device features 100% matte tin plating compatible with Pb-free reflow up to 260 °C, per the mechanical drawings in the onsemi datasheet.
What is the maximum power dissipation and thermal derating behavior of the MM5Z3V9T1G?
The MM5Z3V9T1G has a maximum steady-state power dissipation of 500 mW at 25 °C ambient on an FR-4 board, with linear derating of 4.0 mW/°C above that temperature. Its junction-to-ambient thermal resistance is 250 °C/W under the same conditions. These values are specified in the Maximum Ratings table (page 1) of the onsemi datasheet and define safe continuous operation limits for thermal design.
Does the MM5Z3V9T1G have ESD protection, and what level is rated?
Yes, the MM5Z3V9T1G is rated for Class 3 ESD protection per the Human Body Model (HBM), exceeding 16 kV. This rating is explicitly stated in the Specification Features section of the onsemi datasheet and confirms robustness against electrostatic discharge during handling, assembly, and end-use in portable electronics environments.
How does the MM5Z3V9T1G compare to the MM3Z3V9T1G in terms of package and compatibility?
The MM5Z3V9T1G and MM3Z3V9T1G share identical electrical specifications-including 3.9 V nominal Zener voltage, ±5% tolerance, 500 mW power rating, and 90 Ω Zener impedance-but differ in package: MM5Z3V9T1G uses SOD-523 (1.20 × 0.80 mm), while MM3Z3V9T1G uses SOD-323 (1.7 × 1.3 mm). Their footprints are not interchangeable; using MM3Z3V9T1G requires PCB layout revision due to larger pad dimensions and pitch.
MM5Z3V9T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±6.4%
- Power - Max:
- 500 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-523
MM5Z3V9T1G FAQ
1.How can I place an order for MM5Z3V9T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MM5Z3V9T1G 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 MM5Z3V9T1G reliable?
The price and inventory of MM5Z3V9T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM5Z3V9T1G is usually 5 days.
3.What payment methods are accepted for MM5Z3V9T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM5Z3V9T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM5Z3V9T1G?
MM5Z3V9T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM5Z3V9T1G 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 MM5Z3V9T1G?
For technical support, including MM5Z3V9T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM5Z3V9T1G requirements.
6.How does Aetrix verify that MM5Z3V9T1G is sourced from the original manufacturer or authorized distributors?
All MM5Z3V9T1G 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 MM5Z3V9T1G meets industry standards.
7.What is the process for return or replacement of MM5Z3V9T1G?
All MM5Z3V9T1G units undergo pre-shipment inspection (PSI). If there is an issue with MM5Z3V9T1G, 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 MM5Z3V9T1G part is unused and in its original packaging.
Return procedure for MM5Z3V9T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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