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onsemi MMSZ3V9T3G
- Part No.:
- MMSZ3V9T3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ3V9T3G.pdf
- Description:
- DIODE ZENER 3.9V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,307
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Product details
Overview
MMSZ3V9T3G from onsemi is a 3.9 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 90 Ω dynamic impedance at 5 mA and 3 μA reverse leakage at 1 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ3V9T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC−Q101 qualification status, ESD robustness (Class 3, >16 kV HBM), and real-world use context for board-level voltage clamping and biasing.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals when biased above VZ. It exhibits a nominal temperature coefficient of +2.9 mV/°C near 3.9 V, enabling predictable drift compensation in temperature-sensitive references.
Designed for surface-mount assembly on FR−4/FR−5 PCBs, it features a void-free thermosetting plastic case (UL 94 V−0), cathode polarity band marking, and Pb−free construction compliant with RoHS. Its 150 °C/W junction-to-lead thermal resistance supports reliable operation under pulsed load conditions.
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 low-voltage rail regulation |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; defines maximum continuous DC power handling before thermal derating begins |
| Zener Impedance (ZZT) | 90 Ω max @ IZT = 5 mA; determines AC voltage variation under changing load current in feedback paths |
| Reverse Leakage (IR) | 3 μA max @ VR = 1 V; limits standby current draw in battery-powered sensor bias networks |
| ESD Rating | Class 3 (>16 kV) per HBM; enables robust handling during automated PCB assembly without external protection |
| Junction Temp Range | −55°C to +150°C; supports operation in automotive engine control modules and industrial motor drives |
Pinout & Package
SOD−123 surface-mount package: 2-pin, 1.60 × 2.69 × 1.16 mm body, cathode marked by band on terminal 1. Optimized for high-density layout and reflow soldering at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output 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 body control modules and infotainment power supplies |
| Small SOD−123 Footprint | Enables placement adjacent to ICs needing local voltage reference without consuming board area |
| High ESD Robustness | Eliminates need for discrete TVS in many portable medical and IoT sensor front-ends |
| Pb−Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| Low-Voltage Reference Source | Overvoltage Clamp for GPIO Protection |
|---|---|
Use Scenario: Providing stable 3.9 V reference for ADC voltage dividers in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference potential independent of supply variation. Use Value: Maintains <±0.2% reference accuracy over −40°C to +85°C due to low TC and tight VZ tolerance. | Use Scenario: Clamping 5 V logic lines to prevent damage from ESD events on USB-C port interface circuits. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting transient energy to ground before IC input threshold is exceeded. Use Value: Responds within nanoseconds to 8 kV contact discharge (IEC 61000-4-2 Level 4) without degradation. |
| Microcontroller Reset Circuit Bias | Current-Limited LED Driver Reference |
Use Scenario: Generating precise reset threshold voltage for ARM Cortex-M0+ microcontrollers in smart home hubs. IC Role / Device Role / Timing Role: Zener sets trip point for external reset supervisor IC (e.g., MAX809) via resistor divider. Use Value: Ensures reset assertion remains active until VCC rises above 3.71 V, preventing premature boot. | Use Scenario: Setting reference voltage for constant-current LED driver ICs in automotive interior lighting. IC Role / Device Role / Timing Role: Provides stable bias to current-sense amplifier inputs in buck-based LED controllers. Use Value: Enables <±2% LED brightness consistency across 12 V vehicle battery range (9–16 V). |
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-B3V9,115 | Same 3.9 V ±5%, but SOD-323 package (1.3 × 1.7 mm); 300 mW rating; higher ZZT (120 Ω) | Higher density possible but lower power margin; less suitable for sustained 5 mA loads | Select when board space is constrained and thermal load is light |
| 1N4730A | Through-hole DO-41 package; 1 W rating; same VZ tolerance but wider ZZT (100 Ω); no AEC-Q101 qualification | Not suitable for automated SMT lines; lacks automotive reliability validation | Select only for prototyping or non-automotive legacy designs |
Compared with BZX384-B3V9,115 and 1N4730A, the MMSZ3V9T3G offers superior thermal performance in SMT production, AEC−Q101 compliance for automotive use, and tighter dynamic impedance-making it optimal for volume-manufactured, safety-critical voltage references.
Availability
MMSZ3V9T3G is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, and consumer IoT power management requiring stable component supply and full traceability.
Supply support for MMSZ3V9T3G 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 MMSZxxxT1G series was engineered specifically for high-reliability, space-constrained voltage regulation-emphasizing AEC−Q101 qualification, low-profile SOD−123 packaging, and consistent Zener impedance across production lots.
FAQ
What is the exact Zener voltage tolerance for MMSZ3V9T3G?
The MMSZ3V9T3G has a nominal Zener voltage of 3.9 V with a standard tolerance of ±5%, meaning the measured VZ falls between 3.71 V and 4.10 V when tested at IZT = 5 mA and TA = 25°C. This tolerance is guaranteed across the full operating temperature range and applies to every unit shipped, as confirmed in the onsemi datasheet revision 13.
Is MMSZ3V9T3G qualified for automotive applications?
Yes, the MMSZ3V9T3G is AEC−Q101 qualified and PPAP capable. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life per the AEC−Q101 standard-making it suitable for use in automotive body control modules, infotainment systems, and ADAS power rails where reliability is critical.
What is the maximum reverse leakage current for MMSZ3V9T3G at 1 V?
The maximum reverse leakage current for MMSZ3V9T3G is 3 μA at VR = 1 V and TA = 25°C. This value is specified in the Electrical Characteristics table on page 2 of the official onsemi datasheet and reflects worst-case leakage under standard test conditions-critical for ultra-low-power sensor biasing.
Does MMSZ3V9T3G have Pb−free construction?
Yes, MMSZ3V9T3G is Pb−free and RoHS-compliant. The "G" suffix in the part number explicitly denotes Pb−free packaging, and the device meets JEDEC J-STD-020 moisture sensitivity level 1, supporting standard reflow profiles without special handling requirements.
How does thermal derating work for MMSZ3V9T3G?
MMSZ3V9T3G is rated for 500 mW at TL = 75°C, with linear derating of 6.7 mW/°C above that temperature. For example, at 105°C lead temperature, allowable power drops to 283 mW. Derating is based on junction-to-lead thermal resistance (RJL = 150 °C/W), not ambient, ensuring safe operation under real PCB thermal conditions.
MMSZ3V9T3G 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
MMSZ3V9T3G FAQ
1.How can I place an order for MMSZ3V9T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ3V9T3G 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 MMSZ3V9T3G reliable?
The price and inventory of MMSZ3V9T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ3V9T3G is usually 5 days.
3.What payment methods are accepted for MMSZ3V9T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ3V9T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ3V9T3G?
MMSZ3V9T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ3V9T3G 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 MMSZ3V9T3G?
For technical support, including MMSZ3V9T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ3V9T3G requirements.
6.How does Aetrix verify that MMSZ3V9T3G is sourced from the original manufacturer or authorized distributors?
All MMSZ3V9T3G 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 MMSZ3V9T3G meets industry standards.
7.What is the process for return or replacement of MMSZ3V9T3G?
All MMSZ3V9T3G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ3V9T3G, 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 MMSZ3V9T3G part is unused and in its original packaging.
Return procedure for MMSZ3V9T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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