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onsemi SZNZ8F18VSMX2WT5G
- Part No.:
- SZNZ8F18VSMX2WT5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- 2-XDFN
- Datasheet:
-
SZNZ8F18VSMX2WT5G.pdf
- Description:
- DIODE ZENER 18V 250MW 2-X2DFNW
- Quantity:
- Payment:
- Shipping:
Inventory:8,000
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Product details
Overview
SZNZ8F18VSMX2WT5G from onsemi is an AEC-Q101-qualified Zener diode designed for precision voltage regulation and transient overvoltage clamping in space-constrained automotive and industrial circuits. It delivers a nominal Zener voltage of 18.0 V (17.59–18.41 V at IZT = 5 mA), with ±2.3% tolerance, 50 Ω dynamic impedance, and 0.1 µA leakage current at 14 V reverse bias - enabling stable reference and ESD protection in power management rails.
For engineers reviewing the SZNZ8F18VSMX2WT5G datasheet, pinout, applications, or equivalent options, key selection criteria include tight voltage tolerance, wettable flank X2DFNW2 package compatibility with AOI, AEC-Q101 qualification for automotive control units, and low 0.40 mm profile for high-density PCB layouts.
Technical Context
This device operates as a unidirectional, silicon planar Zener diode optimized for low-power voltage reference and clamping functions. Its electrical behavior is defined by sharp reverse breakdown at 18.0 V with minimal temperature coefficient (±6 mV/°C typical) and low capacitance (60 pF at 0 V, 1 MHz), supporting fast transient response in signal line protection.
The X2DFNW2 package features wettable flanks for reliable solder-joint inspection and thermal performance rated at RJA = 247 °C/W (150 mm² pad), enabling 500 mW dissipation at 25 °C ambient - critical for under-hood automotive modules where thermal margin and optical inspection are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.59–18.41 V @ IZT = 5 mA - ensures precise clamping within ±2.3% across production lot |
| Power Dissipation (PD) | 500 mW @ TA = 25 °C (150 mm² pad) - supports sustained operation in automotive ECUs without forced cooling |
| Zener Impedance (ZZT) | 50 Ω max @ IZT = 5 mA - maintains stable regulation under varying load currents |
| Reverse Leakage (IR) | 0.1 µA @ VR = 14 V - minimizes standby power loss in battery-backed systems |
| Capacitance (C) | 60 pF @ VR = 0 V, f = 1 MHz - preserves signal integrity in high-speed data lines |
| Package | X2DFNW2 (0402, 1.00 × 0.60 × 0.37 mm) - enables automated optical inspection and ultra-compact placement |
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM ≥ 2 kV) - required for engine control and ADAS modules |
Pinout & Package
The SZNZ8F18VSMX2WT5G uses the X2DFNW2 surface-mount package (Case 711BG), measuring 1.00 mm × 0.60 mm × 0.37 mm with wettable flank side walls for AOI compatibility. The device has two terminals: Cathode (Pin 1) and Anode (Pin 2), marked per the "CZ" code on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage rail; reverse-biased during clamping; carries full surge current |
| 2 (Anode) | Reference/ground terminal | Bonded to PCB ground plane; establishes reference potential for voltage threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±2.3% (17.59–18.41 V) - reduces calibration overhead in 12 V/24 V automotive power monitoring |
| Wettable flank leads | Full-side solder fillet visibility - eliminates voiding risk and enables 100% AOI pass rate in Tier-1 assembly lines |
| AEC-Q101 qualification | PPAP-capable with full stress test report - satisfies OEM requirements for powertrain and body control modules |
| Low-profile packaging | 0.37 mm height - allows placement beneath connectors or under shields in compact infotainment head units |
| Pb-free, halogen-free | RoHS-compliant materials with BFR-free construction - meets EU ELV and China RoHS II directives |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping 12 V supply rail transients induced by fuel injector switching in gasoline direct injection systems. IC Role / Device Role / Timing Role: Unidirectional voltage clamp protecting microcontroller I/O and analog front-end inputs. Use Value: Prevents latch-up and resets by limiting spikes to ≤18.4 V while drawing <0.1 µA quiescent current. |
Use Scenario: Providing stable 18 V reference for 4–20 mA loop-powered pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Precision shunt reference establishing excitation voltage for bridge sensors. Use Value: Maintains ±0.4 V regulation error over −40 to +125 °C, reducing sensor offset drift by >3× vs. standard Zeners. |
| Automotive Infotainment Power Sequencing | USB-C Port Overvoltage Protection |
Use Scenario: Regulating auxiliary 18 V rail for display backlight drivers in head unit mainboards. IC Role / Device Role / Timing Role: Shunt regulator stabilizing intermediate voltage between buck converter and LED driver IC. Use Value: Enables 500 mW continuous dissipation without heatsink, eliminating need for external LDO in space-limited designs. |
Use Scenario: Protecting USB-C CC logic pins from 20 V PD negotiation surges during adapter hot-plug events. IC Role / Device Role / Timing Role: Fast-response transient voltage suppressor placed directly at connector interface. Use Value: 60 pF capacitance avoids signal degradation on 10 Gbps USB3.2 Gen2x2 lanes while clamping to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5925BT3G | 500 mW DO-214AA package; ±5% tolerance (17.1–18.9 V); 100 Ω ZZT; no AEC-Q101 rating | General-purpose industrial use only; unsuitable for automotive PPAP due to lack of qualification and larger footprint | Select when cost is primary and automotive compliance is not required; requires PCB layout change |
| MMSZ5245B-TP | 500 mW SOD-123; ±5% tolerance (17.1–18.9 V); 30 Ω ZZT; no wettable flanks or AEC-Q101 | Consumer electronics and non-automotive embedded systems; lacks AOI support and automotive reliability validation | Choose for high-volume consumer products where AOI and PPAP are unnecessary; same 18 V nominal but looser tolerance |
Compared with 1SMB5925BT3G and MMSZ5245B-TP, the SZNZ8F18VSMX2WT5G offers tighter tolerance, wettable flank inspection capability, and AEC-Q101 qualification - making it the only option qualified for automotive ECU and ADAS subsystems requiring zero-defect manufacturing traceability.
Availability
SZNZ8F18VSMX2WT5G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, and USB-C overvoltage protection circuits requiring stable component supply, AEC-Q101 compliance, and AOI-compatible packaging.
Supply support for SZNZ8F18VSMX2WT5G 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 NZ8F Series is part of onsemi's precision discrete portfolio, engineered specifically for automotive-grade voltage regulation and transient suppression in high-reliability, space-constrained environments.
FAQ
What is the Zener voltage tolerance of SZNZ8F18VSMX2WT5G?
The SZNZ8F18VSMX2WT5G has a tight tolerance of ±2.3%, with a specified Zener voltage range of 17.59 V to 18.41 V at IZT = 5 mA. This is achieved via the "S" grade (tight tolerance) variant in the NZ8F series, distinct from the standard "M" grade (±5%). The SZNZ8F18VSMX2WT5G achieves this accuracy without requiring post-manufacturing trimming, supporting high-yield automotive production.
Is SZNZ8F18VSMX2WT5G qualified for automotive applications?
Yes, the SZNZ8F18VSMX2WT5G is AEC-Q101 qualified and PPAP capable, with full test reports covering HTGB, HTRB, temperature cycling, and ESD (HBM ≥ 2 kV). The "SZ" prefix explicitly denotes automotive-grade process controls, unique site traceability, and change management - satisfying Tier-1 OEM requirements for engine control, body electronics, and ADAS modules.
What is the maximum power dissipation for SZNZ8F18VSMX2WT5G?
The SZNZ8F18VSMX2WT5G supports 500 mW total device dissipation at TA = 25 °C when mounted on a 150 mm² FR-4 board with 1 oz. copper (Note 2 in datasheet). Derating is 1.2 mW/°C above 25 °C. This higher rating versus the 250 mW rating (Note 1, minimum pad) enables robust operation in thermally demanding automotive under-hood locations.
Does SZNZ8F18VSMX2WT5G have wettable flank leads?
Yes, the SZNZ8F18VSMX2WT5G uses the X2DFNW2 package with wettable flank side walls, enabling full-solder-fillet visibility for automated optical inspection (AOI). This feature is explicitly called out in the datasheet's Specification Features section and is critical for zero-defect manufacturing in automotive electronics assembly lines.
What is the reverse leakage current specification for SZNZ8F18VSMX2WT5G?
The SZNZ8F18VSMX2WT5G specifies a maximum reverse leakage current (IR) of 0.1 µA at VR = 14 V and TA = 25 °C. This low leakage supports extended battery life in always-on automotive modules such as telematics control units and tire pressure monitoring systems where standby current must remain below 1 µA.
SZNZ8F18VSMX2WT5G 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:
- ±2.28%
- 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)
SZNZ8F18VSMX2WT5G FAQ
1.How can I place an order for SZNZ8F18VSMX2WT5G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNZ8F18VSMX2WT5G 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 SZNZ8F18VSMX2WT5G reliable?
The price and inventory of SZNZ8F18VSMX2WT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNZ8F18VSMX2WT5G is usually 5 days.
3.What payment methods are accepted for SZNZ8F18VSMX2WT5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNZ8F18VSMX2WT5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNZ8F18VSMX2WT5G?
SZNZ8F18VSMX2WT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNZ8F18VSMX2WT5G 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 SZNZ8F18VSMX2WT5G?
For technical support, including SZNZ8F18VSMX2WT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNZ8F18VSMX2WT5G requirements.
6.How does Aetrix verify that SZNZ8F18VSMX2WT5G is sourced from the original manufacturer or authorized distributors?
All SZNZ8F18VSMX2WT5G 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 SZNZ8F18VSMX2WT5G meets industry standards.
7.What is the process for return or replacement of SZNZ8F18VSMX2WT5G?
All SZNZ8F18VSMX2WT5G units undergo pre-shipment inspection (PSI). If there is an issue with SZNZ8F18VSMX2WT5G, 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 SZNZ8F18VSMX2WT5G part is unused and in its original packaging.
Return procedure for SZNZ8F18VSMX2WT5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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