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onsemi SZNZ9F18VST5G
- Part No.:
- SZNZ9F18VST5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-923
- Datasheet:
-
SZNZ9F18VST5G.pdf
- Description:
- DIODE ZENER 18V 250MW SOD923
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
SZNZ9F18VST5G from onsemi is a 250 mW, 17.56–18.35 V Zener voltage regulator diode in SOD-923 package, designed for precision voltage clamping and overvoltage protection in space-constrained PCBs. It delivers tight Zener tolerance (±5%), low 60 Ω dynamic impedance at 5 mA test current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SZNZ9F18VST5G datasheet, pinout, applications, or equivalent options, key selection criteria include its 18 V nominal regulation, 250 mW power rating, SOD-923 footprint compatibility, Class 3 ESD robustness (>16 kV HBM), and automotive-qualified SZ-prefix construction.
Technical Context
This device operates as a two-terminal reverse-biased Zener diode, maintaining stable output voltage across load and line variations via controlled avalanche breakdown. Its 5 mA Zener test current and 0.5 mA knee current ensure predictable turn-on behavior with minimal leakage (<0.1 µA at 14 V).
The SOD-923 package enables high-density placement with 1.00 mm × 0.60 mm body and 0.40 mm height, while its 100% matte tin lead finish supports Pb-free reflow up to 260 °C and meets MSL 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.56–18.35 V at IZT = 5 mA - defines precise clamping threshold for 18 V rail protection |
| Power Dissipation | 250 mW @ TA = 25 °C - limits continuous thermal load on FR-5 board without heatsinking |
| Zener Impedance (ZZT) | 50 Ω max @ IZT = 5 mA - ensures low AC impedance for stable regulation under dynamic loads |
| Reverse Leakage (IR) | <0.1 µA @ VR = 14 V - minimizes standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robust handling immunity during assembly and field operation |
| Temperature Coefficient | +12.4 mV/°C @ IZT = 5 mA - quantifies VZ drift over temperature for system margining |
| Capacitance | 60 pF max @ VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability |
Pinout & Package
SOD-923 surface-mount package: 1.00 mm × 0.60 mm × 0.40 mm body, cathode marked with polarity band, RoHS-compliant 100% matte tin terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode | Connected to ground or lower-potential reference; completes current path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control units and infotainment power rails |
| Tight VZ Tolerance | ±5% over full operating range - reduces need for post-production trimming in voltage reference designs |
| Low Profile Height | 0.40 mm max - enables stacking under shields or placement near tall components on ultra-thin modules |
| Pb-Free & RoHS Compliant | Meets global environmental regulations and supports lead-free reflow profiles up to 260 °C |
| High ESD Robustness | >16 kV HBM - eliminates need for external ESD protection in handheld and portable interfaces |
Applications
| Automotive Body Control Module | Smartphone Power Management |
|---|---|
|
Use Scenario: Clamping transient spikes on 12 V supply lines feeding microcontrollers and sensors. IC Role / Device Role: Overvoltage protection element placed directly at IC power input pins. Use Value: Prevents latch-up or damage during load-dump events using its 18 V breakdown and 250 mW surge capability. |
Use Scenario: Regulating auxiliary voltage rails for camera modules and audio codecs. IC Role / Device Role: Precision shunt reference providing stable bias for analog front-end circuitry. Use Value: Delivers ±5% VZ accuracy and 60 pF capacitance compatible with high-speed signal integrity requirements. |
| Industrial IoT Sensor Node | USB-C Power Delivery Adapter |
|
Use Scenario: Protecting low-power MCU I/O pins from ESD and inductive kickback in wireless sensor enclosures. IC Role / Device Role: Primary ESD clamp integrated into compact PCB layout alongside RF transceiver. Use Value: Leverages >16 kV HBM rating and 0.40 mm height to co-locate with antenna traces without compromising RF performance. |
Use Scenario: Stabilizing feedback voltage in secondary-side synchronous rectifier controllers. IC Role / Device Role: Shunt regulator establishing precise 18 V reference for optocoupler biasing. Use Value: Maintains regulation stability across −40 °C to +125 °C with +12.4 mV/°C tempco and 50 Ω ZZT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C18LT1G | Same 18 V nominal VZ, but 300 mW rating and SOD-523 package (smaller: 1.2 × 0.8 mm) | Higher power handling but tighter layout constraints due to smaller pad pitch | Select when higher surge energy absorption is required and board real estate allows SOD-523 footprint |
| MMSZ5245B-TP | 18 V VZ, 500 mW rating, SOD-123 package (larger: 2.7 × 1.6 mm), ±5% tolerance | Greater thermal mass for sustained dissipation, but occupies ~7× more area than SOD-923 | Select when thermal derating dominates layout priority and space permits larger footprint |
Compared with BZX584C18LT1G and MMSZ5245B-TP, the SZNZ9F18VST5G offers optimal balance of ultra-compact size, automotive qualification, and 250 mW capability-making it ideal for next-gen portable and automotive electronics where volume and reliability are jointly constrained.
Availability
SZNZ9F18VST5G is available at Aetrix Electronics and suitable for automotive body control modules, smartphone power management circuits, and industrial IoT sensor nodes requiring stable component supply with AEC-Q101 compliance and long-term lifecycle support.
Supply support for SZNZ9F18VST5G 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 SZNZ9F18VST5G belongs to onsemi's NZ9F/SZNZ9F series of miniature Zener regulators-designed specifically for high-density, space-limited applications demanding automotive-grade reliability and tight voltage tolerance.
FAQ
What is the Zener voltage tolerance of SZNZ9F18VST5G?
The SZNZ9F18VST5G has a Zener voltage range of 17.56 V to 18.35 V at IZT = 5 mA, corresponding to ±5% tolerance around the nominal 18 V rating. This tight tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet and applies across the full operating temperature range.
Is SZNZ9F18VST5G qualified for automotive use?
Yes, the SZNZ9F18VST5G carries the "SZ" prefix indicating AEC-Q101 qualification and PPAP capability. It is explicitly designated for automotive and other applications requiring unique site and control change requirements, as stated in the Specification Features section of the datasheet.
What is the maximum power dissipation for SZNZ9F18VST5G at 85 °C ambient?
At 85 °C ambient, the SZNZ9F18VST5G derates linearly from 250 mW at 25 °C using the 2.0 mW/°C derating factor. This yields 250 mW − (60 °C × 2.0 mW/°C) = 130 mW maximum steady-state power dissipation, as defined in the Maximum Ratings table.
Does SZNZ9F18VST5G have polarity marking on the package?
Yes, the SZNZ9F18VST5G uses Style 1 marking per the mechanical drawing: Pin 1 (cathode) is identified by a polarity band on the SOD-923 case. The marking diagram on page 4 confirms this orientation, with "X" denoting the device code and "M" the date code.
What is the forward voltage of SZNZ9F18VST5G at 10 mA?
The forward voltage of SZNZ9F18VST5G is specified as ≤0.9 V at IF = 10 mA, consistent across all devices in the NZ9F/SZNZ9F series per the Electrical Characteristics note on page 2 of the datasheet. This value is measured under standard test conditions at TA = 25 °C.
SZNZ9F18VST5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-923
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2.19%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
SZNZ9F18VST5G FAQ
1.How can I place an order for SZNZ9F18VST5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNZ9F18VST5G 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 SZNZ9F18VST5G reliable?
The price and inventory of SZNZ9F18VST5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNZ9F18VST5G is usually 5 days.
3.What payment methods are accepted for SZNZ9F18VST5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNZ9F18VST5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNZ9F18VST5G?
SZNZ9F18VST5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNZ9F18VST5G 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 SZNZ9F18VST5G?
For technical support, including SZNZ9F18VST5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNZ9F18VST5G requirements.
6.How does Aetrix verify that SZNZ9F18VST5G is sourced from the original manufacturer or authorized distributors?
All SZNZ9F18VST5G 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 SZNZ9F18VST5G meets industry standards.
7.What is the process for return or replacement of SZNZ9F18VST5G?
All SZNZ9F18VST5G units undergo pre-shipment inspection (PSI). If there is an issue with SZNZ9F18VST5G, 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 SZNZ9F18VST5G part is unused and in its original packaging.
Return procedure for SZNZ9F18VST5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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