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onsemi SZMM3Z4V7ST1G
- Part No.:
- SZMM3Z4V7ST1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z4V7ST1G.pdf
- Description:
- DIODE ZENER 4.7V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,832
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Product details
Overview
SZMM3Z4V7ST1G from onsemi is a 4.55–4.75 V, ±5% tolerance Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation and 800 Ω max dynamic impedance at 5 mA test current, used for precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the SZMM3Z4V7ST1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), low capacitance (260 pF), AEC−Q101 qualification, ESD robustness (>16 kV HBM), and thermal resistance (250 °C/W with heatsink).
Technical Context
This device operates as a two-terminal voltage reference by maintaining a stable reverse breakdown voltage across its cathode–anode terminals under controlled Zener current (IZT = 5 mA). Its tight 4.55–4.75 V range and ±5% tolerance support accurate biasing and regulation in low-power analog circuits.
The SOD−323 package enables high-density PCB layout with minimal footprint (1.7 mm × 1.25 mm) and low profile (0.9 mm height), while its Pb−free, RoHS-compliant construction and Class 3 ESD rating (>16 kV HBM) meet automotive and portable consumer requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.55–4.75 V at IZT = 5 mA - defines precise clamping threshold for voltage-sensitive circuit nodes |
| Tolerance | ±5% - ensures predictable regulation without post-production trimming |
| Power Rating | 500 mW (with heatsink) - supports sustained operation in compact DC-DC feedback paths |
| Zener Impedance (ZZT) | 800 Ω max at IZT - limits output voltage variation under load transients |
| Capacitance | 260 pF max at VR = 0 V, f = 1 MHz - minimizes signal coupling in RF-adjacent bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - protects against handling-induced damage in automated assembly |
| Thermal Resistance (RJA) | 250 °C/W with 38 mm² copper heatsink - enables thermal management on standard FR-4 boards |
Pinout & Package
SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.85 mm body, cathode indicated by polarity band, Pb−free plating, UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to regulated node; carries Zener current during breakdown conduction |
| 2 (Anode) | Reference/ground terminal | Bias reference point; establishes voltage drop direction and polarity for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener voltage tolerance | ±5% at 5 mA - reduces need for external calibration in voltage reference designs |
| AEC−Q101 qualification | Automotive-grade reliability validation - supports use in infotainment and ADAS subsystems |
| Low-profile SOD−323 package | 0.9 mm height - enables placement beneath connectors or under shields in ultra-thin devices |
| High ESD immunity | >16 kV HBM - eliminates need for supplemental TVS protection in handheld ESD-prone interfaces |
| Pb−free, RoHS-compliant | Halogen-free/BFR-free materials - satisfies global environmental compliance without derating |
Applications
| Smartphone Power Management | Automotive Infotainment Biasing |
|---|---|
Use Scenario: Providing stable 4.7 V reference for PMIC enable thresholds and ADC input scaling in LTE/5G handsets. IC Role / Device Role / Timing Role: Voltage reference and overvoltage clamp for low-noise LDO feedback networks. Use Value: ±5% VZ tolerance ensures consistent enable timing across production units without binning. | Use Scenario: Regulating bias voltage for audio codec ICs and display driver ICs in dashboard clusters. IC Role / Device Role / Timing Role: Precision shunt regulator for analog supply rails requiring <1% drift over −40°C to +125°C. Use Value: AEC−Q101 qualification and 250 °C/W RJA allow direct integration into thermally constrained instrument panel PCBs. |
| Wearable Sensor Node Reference | Industrial IoT Edge Controller Protection |
Use Scenario: Generating clean 4.7 V reference for MEMS accelerometer and gyroscope signal conditioning circuits. IC Role / Device Role / Timing Role: Low-capacitance (260 pF) Zener reference minimizing noise coupling into high-gain analog front-ends. Use Value: 260 pF capacitance prevents RF interference from degrading sensor SNR in Bluetooth LE wearable designs. | Use Scenario: Clamping transient surges on 5 V logic rails in programmable logic controllers exposed to industrial EMI. IC Role / Device Role / Timing Role: Fast-response overvoltage protector for FPGA configuration I/O banks and microcontroller reset lines. Use Value: >16 kV HBM ESD rating and 800 Ω ZZT ensure reliable clamping without latch-up during factory handling or field ESD events. |
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-B4V7,115 | Same 4.7 V nominal, ±5% tolerance, but SOD-323 package with 300 mW rating and higher ZZT (1000 Ω) | Limited to lower-power biasing due to reduced power handling | Select when cost sensitivity outweighs thermal margin needs in non-automotive consumer designs |
| MMSZ4700T1G | 4.7 V nominal, ±5%, but SOD-123 package (larger footprint: 2.9 mm × 1.3 mm) and 500 mW rating | Requires PCB layout revision due to different pad geometry and polarity marking | Choose when existing SOD-123 footprints exist and board rework is prohibitive |
Compared with BZX384-B4V7,115 and MMSZ4700T1G, SZMM3Z4V7ST1G delivers superior thermal performance (250 °C/W vs. ~350 °C/W) and tighter process control for automotive-grade stability, while maintaining identical voltage accuracy and SOD−323 compatibility.
Availability
SZMM3Z4V7ST1G is available at Aetrix Electronics and suitable for smartphone power management, automotive infotainment biasing, and wearable sensor node reference requiring stable component supply and AEC−Q101 traceability.
Supply support for SZMM3Z4V7ST1G 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, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MM3Z/SZMM3Z series targets space-constrained, high-reliability voltage regulation-designed specifically for portable electronics, automotive subsystems, and industrial sensors needing precision Zener references in ultra-small packages.
FAQ
What is the Zener voltage range of SZMM3Z4V7ST1G?
The SZMM3Z4V7ST1G has a specified Zener voltage range of 4.55 V to 4.75 V at a test current of 5 mA, with ±5% tolerance. This range is verified per onsemi's Electrical Characteristics table and reflects the device's tight regulation capability for precision reference applications. The SZMM3Z4V7ST1G maintains this specification across its qualified operating temperature range and is validated for AEC−Q101 compliance.
Is SZMM3Z4V7ST1G suitable for automotive applications?
Yes, SZMM3Z4V7ST1G is explicitly qualified to AEC−Q101 standards and designated with the "SZ" prefix for automotive and other applications requiring unique site and control change requirements. Its PPAP capability, Class 3 ESD rating (>16 kV HBM), and guaranteed operation from −65°C to +150°C make it suitable for infotainment, body control, and ADAS subsystems. The SZMM3Z4V7ST1G meets automotive reliability and traceability requirements without derating.
What is the maximum power dissipation of SZMM3Z4V7ST1G?
The SZMM3Z4V7ST1G has a maximum steady-state power dissipation of 500 mW when mounted on an FR−4 board with a 38 mm² copper heatsink (RJA = 250 °C/W). Without heatsink, the rating drops to 300 mW (RJA = 416 °C/W). Derating is linear above 25°C ambient, at 4.0 mW/°C with heatsink. These values are confirmed in the Maximum Ratings table of the official onsemi datasheet for SZMM3Z4V7ST1G.
Does SZMM3Z4V7ST1G have RoHS and halogen-free compliance?
Yes, SZMM3Z4V7ST1G is Pb−free, halogen-free/BFR-free, and fully RoHS compliant per EU Directive 2011/65/EU. This is explicitly stated in the Specification Features section of the onsemi datasheet and verified through material declarations. The "G" suffix in the part number denotes Pb−free packaging, and the device carries UL 94 V−0 flammability certification - all confirmed for SZMM3Z4V7ST1G in production documentation.
What is the Zener impedance of SZMM3Z4V7ST1G at 5 mA?
The dynamic Zener impedance (ZZT) of SZMM3Z4V7ST1G is 800 Ω maximum at IZT = 5 mA and TA = 25°C, as specified in the Electrical Characteristics table. This value determines how tightly the device regulates voltage under varying load conditions - lower ZZT yields smaller output voltage deviations. The SZMM3Z4V7ST1G achieves this performance while maintaining low capacitance (260 pF) and high ESD robustness.
SZMM3Z4V7ST1G 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):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z4V7ST1G FAQ
1.How can I place an order for SZMM3Z4V7ST1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z4V7ST1G 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 SZMM3Z4V7ST1G reliable?
The price and inventory of SZMM3Z4V7ST1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z4V7ST1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z4V7ST1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z4V7ST1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z4V7ST1G?
SZMM3Z4V7ST1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z4V7ST1G 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 SZMM3Z4V7ST1G?
For technical support, including SZMM3Z4V7ST1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z4V7ST1G requirements.
6.How does Aetrix verify that SZMM3Z4V7ST1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z4V7ST1G 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 SZMM3Z4V7ST1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z4V7ST1G?
All SZMM3Z4V7ST1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z4V7ST1G, 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 SZMM3Z4V7ST1G part is unused and in its original packaging.
Return procedure for SZMM3Z4V7ST1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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