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onsemi SZNZ8F18VMX2WT5G
- Part No.:
- SZNZ8F18VMX2WT5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- 2-XDFN
- Datasheet:
-
SZNZ8F18VMX2WT5G.pdf
- Description:
- DIODE ZENER 18V 250MW 2-X2DFNW
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
SZNZ8F18VMX2WT5G from onsemi is an AEC-Q101-qualified Zener diode in X2DFNW2 (0402) wettable flank package, delivering 17.1–18.9 V reverse breakdown voltage at 5 mA test current, 50 Ω maximum dynamic impedance, and 0.1 µA leakage at 14 V reverse bias - designed for precision voltage clamping and ESD protection in space-constrained automotive control units.
For engineers reviewing the SZNZ8F18VMX2WT5G datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating behavior, AOI-compatible package details, and automotive-grade reliability data directly extracted from onsemi's official NZ8F Series datasheet (Rev. 4, Nov. 2025).
Technical Context
This device operates as a unidirectional voltage regulator with sharp Zener knee characteristics at IZT = 5 mA, exhibiting low capacitance (60 pF @ 0 V, 1 MHz) and stable temperature coefficient performance across −65 °C to +150 °C junction range. Its X2DFNW2 footprint enables high-density PCB layouts while supporting automated optical inspection via wettable flank geometry.
Thermal management is defined by two dissipation ratings: 250 mW (FR-4 minimum pad) and 500 mW (FR-4 150 mm² copper), with corresponding junction-to-ambient thermal resistances of 415 °C/W and 247 °C/W. Non-repetitive peak reverse power capability is rated at 40 W for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V min / 18.9 V max @ IZT = 5 mA - defines clamping threshold for overvoltage protection circuits |
| Zener Impedance (ZZT) | ≤50 Ω @ IZT = 5 mA - ensures minimal voltage deviation under load transients |
| Reverse Leakage (IR) | ≤0.1 µA @ VR = 14 V - guarantees low standby power loss in always-on systems |
| Capacitance (C) | 60 pF @ VR = 0 V, f = 1 MHz - supports high-speed signal line protection without bandwidth degradation |
| Power Dissipation (PD) | 250 mW (min pad) / 500 mW (enhanced pad) - determines PCB copper area requirements for thermal compliance |
| Junction Temp Range | −65 °C to +150 °C - validated for under-hood automotive environments and industrial edge nodes |
| AEC-Q101 Qualified | Yes - certified for automotive electronics per stress test standard, including HTRB, HTGB, and TCT |
Pinout & Package
X2DFNW2 surface-mount package (Case 711BG), 1.00 × 0.60 × 0.37 mm body with 0.65 mm pitch, wettable flank sidewalls for solder joint inspection. Low profile (0.40 mm height) enables co-placement with fine-pitch ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener reference terminal | Connected to regulated rail or signal line requiring clamping; polarity critical for correct breakdown operation |
| 2 (Anode) | Ground/reference return | Typically tied to system ground or lower-potential node; forms current path during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Wettable Flank Package | Enables 100% automated optical inspection (AOI) of solder fillets on 0402 footprint without x-ray |
| AEC-Q101 Qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Pb-Free / RoHS Compliant | Meets EU Directive 2011/65/EU and JESD204B material content requirements |
| Low Capacitance (60 pF) | Preserves signal integrity on high-speed lines (e.g., CAN FD, LIN, USB 2.0) when used for ESD suppression |
| Tight Thermal Resistance Control | 415 °C/W (min pad) and 247 °C/W (enhanced pad) allow accurate thermal modeling in compact layouts |
Applications
| Automotive Engine Control Unit | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting microcontroller ADC inputs from load dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional voltage clamp limiting input to ≤19 V during ISO 7637-2 Pulse 5a events. Use Value: Prevents ADC saturation and latch-up without adding series resistance that degrades SNR. |
Use Scenario: Stabilizing reference voltage for 24-bit delta-sigma ADCs in precision pressure transducers. IC Role / Device Role / Timing Role: Low-noise shunt regulator establishing stable 18 V bias for analog front-end op-amps. Use Value: 50 Ω ZZT and <0.1 µA IR minimize reference drift and offset error over temperature. |
| Portable Medical Monitor ESD Protection | 5G Small Cell RF Front-End Bias Clamping |
Use Scenario: Safeguarding touchscreen controller I/O pins against IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response transient voltage suppressor placed directly at connector interface. Use Value: 60 pF capacitance avoids signal distortion on 100 kHz touch scan waveforms while clamping to safe levels. |
Use Scenario: Bias rail stabilization for GaN power amplifiers operating near 3.5 GHz in active antenna systems. IC Role / Device Role / Timing Role: DC bias clamp preventing amplifier shutdown during RF envelope peaks. Use Value: Stable 17.1–18.9 V regulation maintains PA quiescent point despite supply ripple up to 200 mVpp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NZ8F18VMX2WT5G | No SZ prefix; not AEC-Q101 qualified; same electrical specs and package | Restricted to commercial/industrial use only; unsuitable for automotive PPAP programs | Select when automotive qualification is unnecessary and cost sensitivity is high |
| SZNZ8F18VSMX2WT5G | Tighter Zener tolerance (17.59–18.41 V); identical package and thermal specs | Better suited for closed-loop feedback references where ±3% variation is unacceptable | Choose when system-level calibration budget requires <±3% VZ variation at 25 °C |
Compared with SZNZ8F18VMX2WT5G, NZ8F18VMX2WT5G lacks automotive qualification but matches all electrical and mechanical specs, while SZNZ8F18VSMX2WT5G trades wider voltage tolerance for tighter regulation - enabling higher-precision biasing at no layout change.
Availability
SZNZ8F18VMX2WT5G is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, portable medical monitors, and 5G RF front-end designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZNZ8F18VMX2WT5G 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 focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.
SZNZ8F18VMX2WT5G belongs to the NZ8F Series Zener diodes - engineered specifically for space-constrained, high-reliability voltage regulation and transient suppression in automotive and industrial systems.
FAQ
What is the Zener voltage tolerance of SZNZ8F18VMX2WT5G?
SZNZ8F18VMX2WT5G has a nominal Zener voltage of 18 V with a tolerance range of 17.1 V (minimum) to 18.9 V (maximum) at IZT = 5 mA, as specified in the onsemi NZ8F Series datasheet Rev. 4. This ±5.3% tolerance reflects the standard tolerance grade (MX2W suffix) and is validated across −65 °C to +150 °C operating range.
Is SZNZ8F18VMX2WT5G suitable for automotive applications?
Yes, SZNZ8F18VMX2WT5G is AEC-Q101 qualified and PPAP capable, with testing covering high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing. The "SZ" prefix explicitly denotes compliance for automotive and other applications requiring controlled site and change management - making it appropriate for engine control, body electronics, and ADAS subsystems.
What is the maximum power dissipation for SZNZ8F18VMX2WT5G on a standard FR-4 board?
SZNZ8F18VMX2WT5G supports 250 mW total device dissipation on an FR-4 board with minimum pad layout (1 oz. Cu), derating linearly at 1.5 mW/°C above 25 °C ambient. With enhanced 150 mm² copper area (1 oz. Cu), it achieves 500 mW dissipation with 1.2 mW/°C derating - both values confirmed in the Maximum Ratings table of the official datasheet.
Does SZNZ8F18VMX2WT5G have wettable flanks, and why does it matter?
Yes, SZNZ8F18VMX2WT5G uses the X2DFNW2 package with wettable flanks - meaning its side terminals are metallized to allow visible solder fillet formation during reflow. This enables 100% automated optical inspection (AOI) of solder joints on 0402 footprints without requiring x-ray, significantly improving manufacturing yield and field reliability in high-volume automotive production.
How does the capacitance of SZNZ8F18VMX2WT5G affect high-frequency circuit design?
SZNZ8F18VMX2WT5G exhibits 60 pF capacitance at 0 V bias and 1 MHz, measured per the datasheet's Electrical Characteristics table. This low value minimizes loading on high-speed signal paths - for example, preserving rise time on 100 Mbps CAN FD buses or avoiding resonance in 3.5 GHz RF bias networks - while maintaining effective clamping for ESD and transients below 100 MHz.
SZNZ8F18VMX2WT5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- NZ8F
- Package/Case:
- 2-XDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- 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, Wettable Flank
- Supplier Device Package:
- 2-X2DFNW (1x0.6)
SZNZ8F18VMX2WT5G FAQ
1.How can I place an order for SZNZ8F18VMX2WT5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNZ8F18VMX2WT5G 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 SZNZ8F18VMX2WT5G reliable?
The price and inventory of SZNZ8F18VMX2WT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNZ8F18VMX2WT5G is usually 5 days.
3.What payment methods are accepted for SZNZ8F18VMX2WT5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNZ8F18VMX2WT5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNZ8F18VMX2WT5G?
SZNZ8F18VMX2WT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNZ8F18VMX2WT5G 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 SZNZ8F18VMX2WT5G?
For technical support, including SZNZ8F18VMX2WT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNZ8F18VMX2WT5G requirements.
6.How does Aetrix verify that SZNZ8F18VMX2WT5G is sourced from the original manufacturer or authorized distributors?
All SZNZ8F18VMX2WT5G 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 SZNZ8F18VMX2WT5G meets industry standards.
7.What is the process for return or replacement of SZNZ8F18VMX2WT5G?
All SZNZ8F18VMX2WT5G units undergo pre-shipment inspection (PSI). If there is an issue with SZNZ8F18VMX2WT5G, 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 SZNZ8F18VMX2WT5G part is unused and in its original packaging.
Return procedure for SZNZ8F18VMX2WT5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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