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onsemi SZNZ9F4V3ST5G
- Part No.:
- SZNZ9F4V3ST5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-923
- Datasheet:
-
SZNZ9F4V3ST5G.pdf
- Description:
- DIODE ZENER 4.3V 250MW SOD923
- Quantity:
- Payment:
- Shipping:
Inventory:7,985
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Product details
Overview
SZNZ9F4V3ST5G from onsemi is a 4.17–4.43 V, 250 mW Zener voltage regulator diode in SOD-923 package, designed for precision low-power voltage clamping and ESD protection in space-constrained portable electronics such as smartphones and high-density PCBs.
For engineers reviewing the SZNZ9F4V3ST5G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±2.5%), 100 Ω dynamic impedance at 5 mA, 16 kV HBM ESD rating, AEC-Q101 qualification, and SOD-923 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 4.3 V, specified at 5 mA test current (IZT). It delivers stable regulation under steady-state DC conditions with tight ±2.5% VZ tolerance and low temperature coefficient (−3.5 mV/°C).
Its 250 mW power rating is derated linearly above 25 °C (2.0 mW/°C), supported by 500 °C/W junction-to-ambient thermal resistance. The SOD-923 package enables surface-mount integration with 1.00 mm × 0.60 mm body and 0.40 mm height, meeting MSL 1 reflow requirements up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.17–4.43 V @ IZT = 5 mA - defines clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 250 mW @ TA = 25 °C - sets maximum continuous DC power handling on FR-5 board |
| Zener Impedance (ZZT) | 100 Ω max @ IZT - ensures minimal voltage shift under load variation |
| ESD Rating | Class 3 (>16 kV) HBM - provides robust electrostatic discharge immunity without external protection |
| Package | SOD-923 (Case 514AB) - 1.00 mm × 0.60 mm × 0.37 mm footprint for ultra-dense layout |
| Temperature Coefficient | −3.5 mV/°C @ IZT = 5 mA - quantifies VZ drift across operating temperature range |
| Reverse Leakage (IR) | 5 μA max @ VR = 1 V - guarantees low standby current in bias networks |
Pinout & Package
SOD-923 package: 2-terminal surface-mount device with cathode marked by polarity band; body dimensions 1.00 mm × 0.60 mm × 0.37 mm; 100% matte tin lead finish; MSL 1 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; accepts reverse bias for Zener conduction |
| 2 | Anode | Connected to ground or reference potential; completes current path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Tight VZ tolerance | ±2.5% at 4.3 V enables precise voltage reference without trimming resistors |
| Low-profile SOD-923 | 0.37 mm height allows stacking under shields or beneath connectors in slim devices |
| Pb-free construction | RoHS-compliant materials and matte Sn plating ensure environmental compliance and solderability |
| High ESD immunity | 16 kV HBM rating eliminates need for discrete TVS in many I/O line protection schemes |
Applications
| Smartphone Power Rail Clamping | USB Interface ESD Protection |
|---|---|
Use Scenario: Clamping 5 V USB VBUS line against transient surges during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast-response voltage limiting at interface connector. Use Value: Prevents damage to USB PHY ICs by clamping transients to ≤4.43 V before they exceed absolute maximum ratings. | Use Scenario: Protecting high-speed data lines (D+/D−) from ESD events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Low-capacitance (210 pF) Zener clamp placed directly at connector pins. Use Value: Maintains signal integrity with <210 pF loading while absorbing >16 kV HBM discharges without degradation. |
| Wearable Sensor Bias Reference | Industrial IoT Node Voltage Monitor |
Use Scenario: Providing stable 4.3 V reference for analog front-end amplifiers in hearable devices. IC Role / Device Role / Timing Role: Precision Zener used as passive voltage reference in low-current sensor signal chain. Use Value: Delivers ±2.5% accuracy and −3.5 mV/°C drift, enabling calibrated measurements without active regulation. | Use Scenario: Monitoring 5 V supply rail in edge gateway controllers using comparator input with hysteresis. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding comparator threshold network. Use Value: Ensures consistent trip point across temperature due to tight VZ tolerance and known TC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C4V3 | 4.3 V nominal, ±5% tolerance, 300 mW PD, SOD-523 package (1.3 mm × 0.85 mm) | Larger footprint; higher power but looser tolerance; not AEC-Q101 qualified | Select when higher power margin is needed and automotive qualification is unnecessary |
| MMSZ4685 | 4.3 V nominal, ±5% tolerance, 500 mW PD, SOD-123 package (3.7 mm × 1.6 mm) | 3.7× larger area; higher thermal mass; no AEC-Q101 or HBM 16 kV rating | Choose for prototyping or non-space-constrained industrial designs requiring higher dissipation |
Compared with BZX584-C4V3 and MMSZ4685, the SZNZ9F4V3ST5G offers superior voltage accuracy (±2.5% vs ±5%), industry-leading compactness (SOD-923), and automotive-grade reliability-making it optimal for production-volume portable and automotive electronics where board area and specification compliance are critical.
Availability
SZNZ9F4V3ST5G is available at Aetrix Electronics and suitable for smartphone power management, USB interface protection, and wearable sensor biasing requiring stable component supply across high-mix, low-latency production programs.
Supply support for SZNZ9F4V3ST5G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NZ9F/SZNZ9F series targets miniaturized, high-reliability Zener regulation in portable and automotive electronics, emphasizing AEC-Q101 qualification, ultra-small packaging, and robust ESD performance.
FAQ
What is the Zener voltage tolerance of SZNZ9F4V3ST5G?
The SZNZ9F4V3ST5G has a Zener voltage tolerance of ±2.5%, specified as 4.17 V minimum to 4.43 V maximum at 5 mA test current (IZT). This tight tolerance enables precise voltage clamping without calibration or trimming in production designs, and is tighter than standard ±5% Zeners like MMSZ4685 or BZX584-C4V3.
Is SZNZ9F4V3ST5G qualified for automotive applications?
Yes, the SZNZ9F4V3ST5G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-grade process control and site-specific change management. It undergoes full stress testing including temperature cycling, HTRB, and 16 kV HBM ESD, making it suitable for under-hood and infotainment systems where reliability is mandated.
What is the maximum power dissipation for SZNZ9F4V3ST5G at 85 °C ambient?
At 85 °C ambient, the SZNZ9F4V3ST5G's maximum power dissipation is 130 mW. This is calculated from its 250 mW rating at 25 °C, derated at 2.0 mW/°C: 250 mW − (85 − 25) × 2.0 mW = 130 mW. Thermal design must account for this reduction to avoid junction overheating beyond 150 °C.
Does SZNZ9F4V3ST5G have a polarity marking, and how is it oriented on the PCB?
Yes, the SZNZ9F4V3ST5G uses Style 1 marking with a cathode polarity band on Pin 1. When mounted on PCB, the banded end aligns with the cathode net (e.g., regulated output or signal line), and the unmarked end is the anode (ground/reference). This matches standard SOD-923 orientation per onsemi's CASE 514AB mechanical drawing.
What is the reverse leakage current of SZNZ9F4V3ST5G at 1 V reverse bias?
The reverse leakage current (IR) of SZNZ9F4V3ST5G is 5 μA maximum at VR = 1 V and TA = 25 °C. This low leakage supports use in high-impedance bias networks and battery-powered circuits where standby current must be minimized without compromising clamping response.
SZNZ9F4V3ST5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-923
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- -
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-923
SZNZ9F4V3ST5G FAQ
1.How can I place an order for SZNZ9F4V3ST5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNZ9F4V3ST5G 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 SZNZ9F4V3ST5G reliable?
The price and inventory of SZNZ9F4V3ST5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNZ9F4V3ST5G is usually 5 days.
3.What payment methods are accepted for SZNZ9F4V3ST5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNZ9F4V3ST5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNZ9F4V3ST5G?
SZNZ9F4V3ST5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNZ9F4V3ST5G 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 SZNZ9F4V3ST5G?
For technical support, including SZNZ9F4V3ST5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNZ9F4V3ST5G requirements.
6.How does Aetrix verify that SZNZ9F4V3ST5G is sourced from the original manufacturer or authorized distributors?
All SZNZ9F4V3ST5G 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 SZNZ9F4V3ST5G meets industry standards.
7.What is the process for return or replacement of SZNZ9F4V3ST5G?
All SZNZ9F4V3ST5G units undergo pre-shipment inspection (PSI). If there is an issue with SZNZ9F4V3ST5G, 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 SZNZ9F4V3ST5G part is unused and in its original packaging.
Return procedure for SZNZ9F4V3ST5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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