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onsemi NZ8F18VMX2WT5G
- Part No.:
- NZ8F18VMX2WT5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- 2-XDFN
- Datasheet:
-
NZ8F18VMX2WT5G.pdf
- Description:
- DIODE ZENER 18V 250MW 2-X2DFNW
- Quantity:
- Payment:
- Shipping:
Inventory:9,564
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Product details
Overview
NZ8F18VMX2WT5G from onsemi is a 250 mW, 17.1–18.9 V Zener diode in X2DFNW2 (0402) wettable flank package, designed for precision voltage regulation and overvoltage protection in space-constrained PCBs. It delivers 5 mA test current, 50 Ω dynamic impedance, 0.1 µA leakage at 14 V reverse bias, and 60 pF capacitance at 0 V - enabling stable clamping in portable power rails and automotive sensor interfaces.
For engineers reviewing the NZ8F18VMX2WT5G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.5%), thermal resistance (415 °C/W on FR-4), wettable flank compatibility with AOI, AEC-Q101 qualification status, and 0402 footprint constraints for high-density layout.
Technical Context
This unidirectional Zener diode operates in reverse breakdown to maintain stable reference voltage under transient overvoltage conditions. Its 17.1–18.9 V nominal range targets mid-range supply rail protection, with temperature coefficient of ±6 mV/°C (typical) ensuring predictable drift across −65 °C to +150 °C junction range.
The X2DFNW2 package enables automated optical inspection via wettable flanks and supports 250 mW dissipation on standard FR-4 (1 oz Cu, minimum pad). Derating begins above 25 °C at 1.5 mW/°C, limiting max ambient operation to ~190 °C before reaching thermal shutdown threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V min / 18.9 V max @ IZT = 5 mA - defines clamping window for 18 V nominal systems |
| Power Dissipation (PD) | 250 mW @ TA = 25 °C - sets maximum continuous surge energy handling on standard PCB |
| Zener Impedance (ZZT) | 50 Ω @ IZT = 5 mA - determines regulation stiffness during fast transients |
| Leakage Current (IR) | 0.1 µA @ VR = 14 V - ensures minimal standby power loss in battery-critical designs |
| Capacitance (C) | 60 pF @ VR = 0 V, f = 1 MHz - impacts high-frequency noise coupling in RF-adjacent circuits |
| Forward Voltage (VF) | 0.9 V max @ IF = 10 mA - defines conduction drop when used bidirectionally or as ESD path |
| Junction Temp Range | −65 °C to +150 °C - supports operation in under-hood automotive and industrial environments |
Pinout & Package
X2DFNW2 (Case 711BG) surface-mount package: 1.00 mm × 0.60 mm × 0.37 mm body, 0.65 mm pitch, wettable flank profile for AOI-compatible solder joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Connected to regulated node; polarity must be observed to enable reverse-bias breakdown |
| 2 (Anode) | Zener cathode connection point | Typically tied to ground or lower-potential rail; forms clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Wettable flank terminals | Enables 100% automated optical inspection of solder fillets without X-ray |
| AEC-Q101 qualified | Validated for automotive electronics including engine control modules and ADAS sensors |
| Pb-Free, Halogen-Free | Complies with RoHS Directive 2011/65/EU and JEDEC JS709E material standards |
| Low profile (0.40 mm height) | Reduces board-level mechanical interference in stacked or shielded assemblies |
| Standard tolerance series | ±5.5% VZ tolerance meets cost-sensitive industrial and consumer design requirements |
Applications
| Automotive Sensor Interface | Portable USB Power Rail |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs from load dump spikes up to 40 V. IC Role / Device Role / Timing Role: Voltage clamp placed between sensor VCC and ground to shunt excess energy during ISO 7637-2 pulse 5a events. Use Value: Limits rail excursion to ≤19 V, preventing damage to 24 V-tolerant op-amps and ADC front-ends while maintaining signal integrity. |
Use Scenario: Stabilizing 5 V USB-C PD output rails in compact power banks and wireless earbud chargers. IC Role / Device Role / Timing Role: Secondary regulation element downstream of buck converter, absorbing ripple and transient overshoot. Use Value: Maintains <±1% output deviation under 100 mA step-load changes due to low ZZT and tight thermal coupling in 0402 footprint. |
| Industrial PLC I/O Module | Medical Wearable Battery Monitor |
Use Scenario: Providing reference stability for 24 V digital input conditioning circuits exposed to field wiring surges. IC Role / Device Role / Timing Role: Zener-based voltage divider feeding comparator hysteresis thresholds in isolated input stages. Use Value: Ensures consistent trip points across −40 °C to +85 °C ambient with <0.5% TC-induced drift per 10 °C change. |
Use Scenario: Clamping cell voltage sensing nodes in lithium-ion battery fuel gauges to prevent ADC saturation. IC Role / Device Role / Timing Role: Reverse-biased protection diode across battery monitor IC inputs (e.g., MAX17055). Use Value: Blocks >18.9 V excursions while adding only 60 pF loading - preserving 16-bit ADC sampling accuracy at 1 kHz update rate. |
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-B18,115 | 18 V ±5%, SOD-323 package (1.7 × 1.3 mm), 300 mW PD, 90 pF C | Larger footprint; higher capacitance limits use in RF-adjacent circuits | Select when higher power margin is required and board area permits larger package |
| MMSZ4689T1G | 18 V ±5%, SOD-123 package (3.7 × 1.6 mm), 500 mW PD, 100 pF C, no wettable flank | Non-AOI compatible; unsuitable for automotive production lines requiring optical solder verification | Choose for cost-sensitive industrial designs where AOI is not mandated and thermal headroom is critical |
Compared with NZ8F18VMX2WT5G, BZX384-B18 offers higher power but sacrifices AOI capability and increases board area by 3.5×; MMSZ4689T1G provides double the dissipation but lacks wettable flanks and adds 40 pF capacitance - making NZ8F18VMX2WT5G optimal for space-constrained, automotive-grade, high-reliability voltage clamping.
Availability
NZ8F18VMX2WT5G is available at Aetrix Electronics and suitable for automotive control units, handheld portables, and industrial PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for NZ8F18VMX2WT5G 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
NZ8F18VMX2WT5G belongs to the NZ8F Series of ultra-miniature Zener diodes engineered for high-density PCBs in automotive and portable electronics where space, reliability, and AOI compatibility are critical.
FAQ
What is the Zener voltage tolerance of NZ8F18VMX2WT5G?
The NZ8F18VMX2WT5G has a Zener voltage range of 17.1 V to 18.9 V at 5 mA test current, corresponding to ±5.5% tolerance around the nominal 18 V rating. This standard tolerance series is optimized for cost-sensitive applications where tighter regulation is not required, unlike the NZ8F18VSMX2WT5G tight-tolerance variant (±2.5%).
Is NZ8F18VMX2WT5G qualified for automotive use?
Yes, NZ8F18VMX2WT5G is AEC-Q101 qualified and PPAP capable when ordered with the SZ prefix (SZNZ8F18VMX2WT5G). The base part NZ8F18VMX2WT5G shares identical electrical and thermal specifications but is intended for industrial and consumer applications; automotive qualification requires explicit ordering of the SZ-prefixed version.
What does the "MX2WT5G" suffix indicate in NZ8F18VMX2WT5G?
The "MX2WT5G" suffix denotes the standard tolerance Zener diode in X2DFNW2 package, tape-and-reel packaging (8,000 units per reel), Pb-free construction ("G"), and compliance with RoHS and halogen-free standards. "M" identifies the standard tolerance series, "X2W" specifies the X2DFNW2 case, "T5" indicates 8 mm tape width, and "G" confirms lead-free finish.
Can NZ8F18VMX2WT5G be used for bidirectional ESD protection?
No - NZ8F18VMX2WT5G is a unidirectional Zener diode optimized for reverse-bias voltage regulation. For bidirectional ESD protection, a dedicated TVS diode such as the ESD5Z3.3T1G (3.3 V, 100 W) or dual-rail configuration would be required. Its forward voltage of 0.9 V max at 10 mA is insufficient for robust ESD clamping in either direction.
What is the thermal resistance of NZ8F18VMX2WT5G on a standard FR-4 board?
NZ8F18VMX2WT5G has a junction-to-ambient thermal resistance (RJA) of 415 °C/W when mounted on an FR-4 board with minimum pad size and 1 oz copper. This value assumes worst-case layout; using a 150 mm² copper pour reduces RJA to 247 °C/W, enabling higher sustained power dissipation before exceeding the 150 °C max junction temperature.
NZ8F18VMX2WT5G 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 2-X2DFNW (1x0.6)
NZ8F18VMX2WT5G FAQ
1.How can I place an order for NZ8F18VMX2WT5G through Aetrix?
Please submit a Request for Quotation (RFQ) for NZ8F18VMX2WT5G 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 NZ8F18VMX2WT5G reliable?
The price and inventory of NZ8F18VMX2WT5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZ8F18VMX2WT5G is usually 5 days.
3.What payment methods are accepted for NZ8F18VMX2WT5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZ8F18VMX2WT5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NZ8F18VMX2WT5G?
NZ8F18VMX2WT5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NZ8F18VMX2WT5G 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 NZ8F18VMX2WT5G?
For technical support, including NZ8F18VMX2WT5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZ8F18VMX2WT5G requirements.
6.How does Aetrix verify that NZ8F18VMX2WT5G is sourced from the original manufacturer or authorized distributors?
All NZ8F18VMX2WT5G 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 NZ8F18VMX2WT5G meets industry standards.
7.What is the process for return or replacement of NZ8F18VMX2WT5G?
All NZ8F18VMX2WT5G units undergo pre-shipment inspection (PSI). If there is an issue with NZ8F18VMX2WT5G, 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 NZ8F18VMX2WT5G part is unused and in its original packaging.
Return procedure for NZ8F18VMX2WT5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NZ8F18VMX2WT5G Tags
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