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onsemi NZ9F18VST5G
- Part No.:
- NZ9F18VST5G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-923
- Datasheet:
-
NZ9F18VST5G.pdf
- Description:
- DIODE ZENER 18V 250MW SOD923
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
NZ9F18VST5G from onsemi is a 18 V ±4.7% Zener diode in SOD-923 package, rated for 250 mW steady-state power dissipation, with 50 Ω max Zener impedance at 5 mA test current and 14 µA max reverse leakage at 14.4 V, used for precision voltage regulation and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the NZ9F18VST5G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±4.7%), low-profile SOD-923 footprint (1.00 mm × 0.60 mm × 0.37 mm), AEC-Q101 qualification status, ESD robustness (>16 kV HBM), and thermal resistance (500 °C/W).
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at 17.56–18.35 V when biased above its knee current (IZK ≤ 0.5 mA). Its 50 Ω dynamic impedance at IZT = 5 mA ensures stable regulation under moderate load transients.
Designed for surface-mount assembly on FR-4 PCBs, it supports reflow up to 260 °C (MSL 1), features 100% matte tin lead finish, and delivers −65 °C to +150 °C junction temperature operation with tight VZ drift (12.4 mV/°C) and 60 pF capacitance at 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.56 V min to 18.35 V max at 5 mA - defines precise clamping threshold for overvoltage protection |
| Power Dissipation (PD) | 250 mW at 25 °C - sets maximum continuous power handling on standard FR-4 board |
| Zener Impedance (ZZT) | 50 Ω max at IZT = 5 mA - ensures minimal output voltage variation under load changes |
| Reverse Leakage (IR) | 0.1 µA max at VR = 14.4 V - guarantees low standby current in battery-powered systems |
| Capacitance (C) | 60 pF max at VR = 0 V, f = 1 MHz - limits high-frequency signal coupling in RF-sensitive circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - enables direct integration into handheld device front-end protection |
| Package | SOD-923 (1.00 mm × 0.60 mm × 0.37 mm) - fits ultra-dense layouts where board area is critical |
Pinout & Package
SOD-923 is a 2-pin surface-mount package with cathode marked by polarity band; body dimensions are 1.00 mm × 0.60 mm × 0.37 mm, height 0.40 mm, and MSL 1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage rail; reverse-biased terminal during Zener operation |
| 2 | Anode | Connected to ground or lower-potential node; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener voltage tolerance | ±4.7% at 18 V - reduces need for post-regulation trimming in production |
| Low-profile SOD-923 package | 0.37 mm height - enables stacking under shields or placement near connectors |
| AEC-Q101 qualification | Qualified for automotive applications - supports use in infotainment power rails and ADAS sensor interfaces |
| High ESD immunity | >16 kV HBM - eliminates need for external ESD diodes in USB or SIM card slots |
| Pb-free and RoHS compliant | 100% matte Sn finish - meets global environmental compliance without solderability trade-offs |
Applications
| Smartphone Power Rail Protection | USB-C Port Overvoltage Clamp |
|---|---|
Use Scenario: Protecting 18 V bias rails in camera module power supplies from transient surges during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping voltage before downstream LDOs or PMIC inputs. Use Value: Prevents latch-up in image sensor ICs by limiting rail excursion to ≤18.35 V with <0.1 µA leakage at 14.4 V. | Use Scenario: Safeguarding USB-C CC logic lines and VCONN circuitry against accidental 20 V PD negotiation faults. IC Role / Device Role / Timing Role: Standby-mode Zener clamp absorbing fault energy without loading active signaling. Use Value: Maintains signal integrity with only 60 pF capacitance while surviving >16 kV ESD strikes per HBM. |
| Automotive Infotainment Display Backlight | Industrial IoT Sensor Node Reference |
Use Scenario: Stabilizing LED driver feedback reference in 12 V–24 V vehicle display systems exposed to load dump transients. IC Role / Device Role / Timing Role: Precision voltage reference providing stable setpoint for current-mode LED control loop. Use Value: Delivers ±4.7% VZ tolerance across −40 °C to +125 °C, qualified to AEC-Q101 for automotive reliability. | Use Scenario: Providing stable 18 V reference for analog front-end amplifiers in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Low-leakage shunt reference enabling multi-year battery life in sleep-mode operation. Use Value: Draws only 0.1 µA at 14.4 V, supporting >10-year shelf life in sealed sensor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C18LT1G | Same 18 V nominal Zener, but 300 mW rating and SOD-523 package (0.8 × 0.6 × 0.5 mm) | Higher power margin; slightly taller profile may conflict with shield clearance | Select when higher surge energy absorption is required and board height allows 0.5 mm height |
| MMSZ4693T1G | 18 V Zener with looser ±5% tolerance, 500 mW rating, and SOD-123 package (3.7 × 1.6 × 1.1 mm) | Lower cost and higher power, but 3× larger footprint and no AEC-Q101 qualification | Select for non-automotive industrial designs where board space is not constrained and qualification is not required |
Compared with BZX584C18LT1G and MMSZ4693T1G, NZ9F18VST5G offers the smallest footprint (SOD-923), AEC-Q101 qualification, and tightest voltage tolerance-making it optimal for automotive and ultra-compact consumer designs where reliability and space efficiency are prioritized over raw power rating.
Availability
NZ9F18VST5G is available at Aetrix Electronics and suitable for smartphone power rail protection, USB-C port overvoltage clamp, and automotive infotainment display backlight requiring stable component supply with full traceability and lifecycle management.
Supply support for NZ9F18VST5G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and intelligent devices.
NZ9F18VST5G belongs to the NZ9FxxxST5G series of low-power Zener regulators designed specifically for space-constrained, high-reliability applications including portable electronics and automotive subsystems.
FAQ
What is the Zener voltage tolerance of NZ9F18VST5G?
The NZ9F18VST5G has a Zener voltage range of 17.56 V to 18.35 V at 5 mA test current, corresponding to a ±4.7% tolerance around the nominal 18 V rating. This tight tolerance is specified per the onsemi datasheet revision 4 (September 2025) and applies under standard test conditions at 25 °C. The NZ9F18VST5G maintains this specification across its qualified operating temperature range.
Is NZ9F18VST5G qualified for automotive applications?
Yes, NZ9F18VST5G is AEC-Q101 qualified and PPAP capable, as confirmed in the onsemi datasheet under "Specification Features." It carries the SZ prefix option (SZNZ9F18VST5G) for automotive-grade traceability and process control, though the standard NZ9F18VST5G variant also meets the same qualification requirements. The NZ9F18VST5G is suitable for use in automotive infotainment, body control modules, and ADAS sensor interfaces.
What is the maximum operating temperature for NZ9F18VST5G?
The NZ9F18VST5G has a junction and storage temperature range of −65 °C to +150 °C, as specified in the Maximum Ratings table of the onsemi datasheet. Its thermal resistance (RJA) is 500 °C/W on FR-4 board, meaning derating begins above 25 °C ambient at 2.0 mW/°C. The NZ9F18VST5G remains fully functional within its rated electrical parameters across this full temperature span when properly mounted.
Does NZ9F18VST5G have Pb-free construction?
Yes, NZ9F18VST5G is a Pb-free device with 100% matte tin lead finish, compliant with RoHS Directive 2011/65/EU. The "G" suffix in the part number explicitly denotes Pb-free packaging, and the epoxy mold compound meets UL 94 V-0 flammability rating. This construction is verified in the Mechanical Characteristics section of the onsemi datasheet for NZ9F18VST5G.
What is the ESD rating of NZ9F18VST5G?
NZ9F18VST5G has an ESD rating of Class 3 (>16 kV) per the Human Body Model (HBM), as stated in the Specification Features section of the onsemi datasheet. This high immunity level is achieved through internal process design and makes the NZ9F18VST5G suitable for direct integration into ESD-prone interfaces such as USB ports, SIM card slots, and display flex connectors without additional protection components.
NZ9F18VST5G 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%
- 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
- Supplier Device Package:
- SOD-923
NZ9F18VST5G FAQ
1.How can I place an order for NZ9F18VST5G through Aetrix?
Please submit a Request for Quotation (RFQ) for NZ9F18VST5G 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 NZ9F18VST5G reliable?
The price and inventory of NZ9F18VST5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZ9F18VST5G is usually 5 days.
3.What payment methods are accepted for NZ9F18VST5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZ9F18VST5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NZ9F18VST5G?
NZ9F18VST5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NZ9F18VST5G 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 NZ9F18VST5G?
For technical support, including NZ9F18VST5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZ9F18VST5G requirements.
6.How does Aetrix verify that NZ9F18VST5G is sourced from the original manufacturer or authorized distributors?
All NZ9F18VST5G 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 NZ9F18VST5G meets industry standards.
7.What is the process for return or replacement of NZ9F18VST5G?
All NZ9F18VST5G units undergo pre-shipment inspection (PSI). If there is an issue with NZ9F18VST5G, 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 NZ9F18VST5G part is unused and in its original packaging.
Return procedure for NZ9F18VST5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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