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onsemi MMSZ3V9T1
- Part No.:
- MMSZ3V9T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ3V9T1.pdf
- Description:
- DIODE ZENER 3.9V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,534
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Product details
Overview
MMSZ3V9T1 from onsemi is a 3.9 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 90 Ω maximum dynamic impedance at 5 mA and 3 μA reverse leakage at 1 V, used for precision low-voltage reference and overvoltage protection in space-constrained DC-DC feedback loops.
For engineers reviewing the MMSZ3V9T1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, AEC−Q101 qualification status, ESD robustness (Class 3, >16 kV HBM), and direct alternatives for automotive and industrial voltage regulation designs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 3.9 V across its terminals under controlled current conditions, with nominal Zener voltage measured at IZT = 5 mA and pulse width = 1 ms. Its temperature coefficient is near zero (~0.2 mV/°C) in the 3–4 V range, minimizing drift over −55°C to +150°C junction temperature.
The device exhibits 90 Ω dynamic impedance at 5 mA test current and 3.5 Ω at 1 mA, enabling tight regulation in low-current bias networks. It features Pb−free construction, UL 94 V−0 flammability rating, and cathode polarity marked by band on SOD−123 case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.71–4.10 V @ IZT = 5 mA; ensures stable 3.9 V reference within ±5% tolerance for feedback sensing |
| Power Dissipation | 500 mW @ TL = 75°C; supports continuous operation in compact PCB layouts with adequate copper area |
| Zener Impedance (ZZT) | 90 Ω max @ IZT = 5 mA; maintains low output impedance for minimal voltage deviation under load transients |
| Reverse Leakage (IR) | 3 μA max @ VR = 1 V; enables ultra-low quiescent current in battery-powered voltage monitor circuits |
| Junction Temp Range | −55°C to +150°C; qualified for under-hood automotive and industrial environments without derating loss |
| ESD Rating | Class 3 (>16 kV) per HBM; withstands handling and board assembly without external protection |
| Package | SOD−123 (1.60 × 2.69 × 1.16 mm); compatible with standard 0805 pick-and-place equipment and high-density routing |
Pinout & Package
SOD−123 two-terminal surface-mount package with cathode indicated by polarity band; optimized for automated placement and reflow soldering at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Unbanded End) | Anode | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive electronics including engine control modules and body controllers |
| 500 mW FR−5 Board Rating | Enables use in cost-sensitive consumer and industrial boards without thermal vias or heatsinking |
| ESD Robustness >16 kV HBM | Eliminates need for external TVS in low-speed signal line clamping applications |
| ±5% VZ Tolerance | Meets precision reference requirements for 3.3 V system rails without post-calibration |
| Pb−Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| USB Power Delivery Clamp | Automotive Sensor Reference |
|---|---|
Use Scenario: Clamping 5 V USB PD bus against transient surges in portable docking stations. IC Role / Device Role / Timing Role: Zener clamp protecting downstream USB controller ICs from overvoltage events. Use Value: 3.9 V breakdown threshold prevents damage to 3.3 V logic while allowing normal 5 V operation with <3 μA leakage. |
Use Scenario: Providing stable 3.3 V reference for analog sensor signal conditioning in engine coolant temperature modules. IC Role / Device Role / Timing Role: Precision voltage reference for ADC input scaling in harsh-temperature automotive environments. Use Value: Near-zero TC and −55°C to +150°C operation ensure <1% reference error across full vehicle operating range. |
| Industrial PLC Input Protection | IoT Node Battery Monitor |
Use Scenario: Overvoltage protection on 24 V DC digital input channels of programmable logic controllers. IC Role / Device Role / Timing Role: Front-end shunt regulator absorbing induced transients before optocoupler input stage. Use Value: 500 mW rating handles repetitive 100 V/100 ns spikes without degradation; SOD−123 footprint saves board space. |
Use Scenario: Monitoring lithium coin-cell voltage in Bluetooth LE asset trackers with ultra-low standby current. IC Role / Device Role / Timing Role: Low-leakage Zener element in resistive divider feeding microcontroller ADC. Use Value: 3 μA max leakage at 1 V ensures <10 nA total divider current, extending 10-year battery life targets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V9 | Same 3.9 V ±5%, but SOT−23 package (larger footprint, higher RJA = 375°C/W) | Less suitable for ultra-dense layouts; requires larger pad geometry and thermal relief | Select when legacy SOT−23 tooling exists and 500 mW rating is not required at elevated ambient |
| MMSZ3V9ET1G | Enhanced version with tighter 3.71–4.09 V tolerance (±4.5%) and lower 70 Ω ZZT | Preferred for high-accuracy references where cost premium is acceptable | Choose for next-gen designs requiring improved regulation stability and reduced tempco drift |
Compared with BZX84-C3V9 and MMSZ3V9ET1G, the MMSZ3V9T1 offers optimal balance of SOD−123 miniaturization, AEC−Q101 qualification, and proven 500 mW capability-making it ideal for new automotive and industrial designs where board area and reliability are prioritized over marginal voltage tolerance improvement.
Availability
MMSZ3V9T1 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC input stages, and IoT battery monitoring circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ3V9T1 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ3V9T1 belongs to the MMSZxxxT1G Zener regulator series designed specifically for high-reliability, space-constrained voltage reference and protection in automotive and industrial systems.
FAQ
What is the exact Zener voltage tolerance for MMSZ3V9T1?
The MMSZ3V9T1 has a nominal Zener voltage of 3.9 V with a guaranteed tolerance of ±5%, corresponding to a minimum of 3.71 V and maximum of 4.10 V when tested at IZT = 5 mA and pulse width = 1 ms. This tolerance is specified per onsemi datasheet Rev. 13 and applies across the full operating temperature range.
Is MMSZ3V9T1 qualified for automotive applications?
Yes, the MMSZ3V9T1 is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive applications such as engine control modules, body electronics, and ADAS sensor interfaces. The device meets stress testing requirements for temperature cycling, humidity, and mechanical shock per the AEC−Q101 standard.
What is the maximum reverse leakage current for MMSZ3V9T1 at 1 V?
The MMSZ3V9T1 exhibits a maximum reverse leakage current of 3 μA at VR = 1 V and TA = 25°C, as confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet. This low leakage supports ultra-low-power battery monitoring and sensor biasing applications.
Does MMSZ3V9T1 have Pb−free construction?
Yes, the MMSZ3V9T1 is Pb−free and RoHS compliant, indicated by the "G" suffix in its full part number MMSZ3V9T1G. The device uses lead-free terminations and conforms to JEDEC J-STD-020 moisture sensitivity level 1, supporting standard reflow profiles without special handling.
What is the thermal resistance junction-to-ambient for MMSZ3V9T1?
The thermal resistance junction-to-ambient (RJA) for MMSZ3V9T1 is 340°C/W when mounted on FR−5 board, as specified in the Maximum Ratings table. This value assumes standard 3.5 × 1.5 inch board size and defines the steady-state temperature rise per milliwatt of dissipated power under natural convection conditions.
MMSZ3V9T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ3V9T1 FAQ
1.How can I place an order for MMSZ3V9T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ3V9T1 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 MMSZ3V9T1 reliable?
The price and inventory of MMSZ3V9T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ3V9T1 is usually 5 days.
3.What payment methods are accepted for MMSZ3V9T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ3V9T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ3V9T1?
MMSZ3V9T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ3V9T1 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 MMSZ3V9T1?
For technical support, including MMSZ3V9T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ3V9T1 requirements.
6.How does Aetrix verify that MMSZ3V9T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ3V9T1 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 MMSZ3V9T1 meets industry standards.
7.What is the process for return or replacement of MMSZ3V9T1?
All MMSZ3V9T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ3V9T1, 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 MMSZ3V9T1 part is unused and in its original packaging.
Return procedure for MMSZ3V9T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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