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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi NZ9F4V3ST5G

Name: NZ9F4V3ST5G
Brand: onsemi
SKU: NZ9F4V3ST5G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NZ9F4V3ST5G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-923

Datasheet:: NZ9F4V3ST5G.pdf

Description:: DIODE ZENER 4.3V 250MW SOD923

Quantity:: RFQ Add To RFQ list

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Inventory:5,884

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Product details

Overview

NZ9F4V3ST5G from onsemi is a 4.17–4.43 V, 250 mW Zener voltage regulator diode in SOD−923 package, designed for precision voltage clamping and regulation in space-constrained portable electronics. It delivers tight Zener tolerance (±5% at I_ZT = 5 mA), low dynamic impedance (Z_ZT ≤ 100 Ω), and Class 3 ESD robustness (>16 kV HBM), enabling reliable overvoltage protection in battery-powered systems.

For engineers reviewing the NZ9F4V3ST5G datasheet, pinout, applications, or equivalent options, key selection criteria include its 4.3 V nominal Zener voltage, 250 mW power rating, SOD−923 footprint compatibility, −3.5 mV/°C temperature coefficient, and AEC−Q101 qualification for automotive-grade reliability.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 100 Ω maximum Zener impedance at 5 mA test current ensures minimal voltage deviation during transient events, while the −3.5 mV/°C temperature coefficient enables predictable drift behavior across −65°C to +150°C junction range.

The device uses a void-free thermosetting plastic package with matte tin lead finish, qualified to MSL 1 and rated for 260°C reflow. With 0.40 mm body height and 1.00 mm × 0.60 mm outline, it supports high-density PCB layouts where thermal resistance (R_JA = 500°C/W) and mechanical robustness are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.17–4.43 V @ I_ZT = 5 mA - defines clamping threshold for overvoltage protection circuits
Power Dissipation (P_D)	250 mW @ T_A = 25°C - sets maximum continuous power handling on FR-4 board
Zener Impedance (Z_ZT)	≤100 Ω @ I_ZT = 5 mA - ensures low voltage variation under load changes
ESD Rating	Class 3 (>16 kV HBM) - provides robust electrostatic discharge immunity in handheld assembly
Temperature Coefficient	−3.5 mV/°C @ I_ZT = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining
Capacitance (C)	210 pF max @ V_R = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability
Junction Temp Range	−65°C to +150°C - supports operation in automotive under-hood and industrial environments

Pinout & Package

SOD−923 surface-mount package: 0.039″ × 0.024″ (1.00 mm × 0.60 mm), 0.016″ (0.40 mm) height, matte Sn finish, MSL 1, 260°C reflow capable.

Pin/Terminal	Circuit Role	Design Meaning
1 (Marked side)	Cathode	Connected to regulated output node; accepts reverse bias for Zener conduction
2	Anode	Connected to ground or lower-potential rail; completes Zener current path

Key Features

Feature	Design Value
Tight V_Z tolerance	±5% at I_ZT = 5 mA - reduces need for post-production trimming in voltage reference designs
Pb-free construction	RoHS-compliant, 100% matte Sn lead finish - meets environmental compliance without solderability trade-offs
AEC-Q101 qualification	Automotive-grade reliability with PPAP capability - enables use in safety-critical vehicle subsystems
Low-profile packaging	0.40 mm max height - allows stacking under shields or placement near tall components on dense PCBs
High ESD immunity	Class 3 (>16 kV HBM) - eliminates need for external ESD protection in consumer portables

Applications

Smartphone Power Rail Protection	USB-C Port Overvoltage Clamp
Use Scenario: Clamping 5 V USB power input against surge transients in compact smartphone PMIC domains. IC Role / Device Role / Timing Role: Zener voltage clamp placed between VBUS and GND to shunt excess energy during ESD or hot-plug events. Use Value: 250 mW rating and 210 pF capacitance allow fast response without loading high-speed data lines.	Use Scenario: Protecting USB-C controller I/O pins from accidental 12–20 V misconnection in multi-role ports. IC Role / Device Role / Timing Role: Standby Zener regulator holding line at safe voltage until fault detection circuitry activates. Use Value: −3.5 mV/°C tempco ensures stable clamping across operating temperature range of mobile accessories.
Automotive Cabin Infotainment MCU Reset Circuit	Wearable Fitness Tracker Battery Monitor Reference
Use Scenario: Providing clean 4.3 V reset threshold for infotainment SoC in vehicles with wide battery voltage swings (9–16 V). IC Role / Device Role / Timing Role: Precision Zener reference feeding comparator input for brown-out detection. Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure reliability in unheated cabin zones.	Use Scenario: Generating stable reference for ADC-based Li-ion cell voltage measurement in ultra-thin wristbands. IC Role / Device Role / Timing Role: Low-capacitance Zener providing bias point for analog front-end scaling network. Use Value: 0.40 mm height and 1.00 mm × 0.60 mm footprint enable integration beneath OLED display modules.

Smartphone Power Rail Protection

USB-C Port Overvoltage Clamp

Use Scenario: Clamping 5 V USB power input against surge transients in compact smartphone PMIC domains.

IC Role / Device Role / Timing Role: Zener voltage clamp placed between VBUS and GND to shunt excess energy during ESD or hot-plug events.

Use Value: 250 mW rating and 210 pF capacitance allow fast response without loading high-speed data lines.

Use Scenario: Protecting USB-C controller I/O pins from accidental 12–20 V misconnection in multi-role ports.

IC Role / Device Role / Timing Role: Standby Zener regulator holding line at safe voltage until fault detection circuitry activates.

Use Value: −3.5 mV/°C tempco ensures stable clamping across operating temperature range of mobile accessories.

Automotive Cabin Infotainment MCU Reset Circuit

Wearable Fitness Tracker Battery Monitor Reference

Use Scenario: Providing clean 4.3 V reset threshold for infotainment SoC in vehicles with wide battery voltage swings (9–16 V).

IC Role / Device Role / Timing Role: Precision Zener reference feeding comparator input for brown-out detection.

Use Value: AEC-Q101 qualification and −65°C to +150°C operation ensure reliability in unheated cabin zones.

Use Scenario: Generating stable reference for ADC-based Li-ion cell voltage measurement in ultra-thin wristbands.

IC Role / Device Role / Timing Role: Low-capacitance Zener providing bias point for analog front-end scaling network.

Use Value: 0.40 mm height and 1.00 mm × 0.60 mm footprint enable integration beneath OLED display modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584-C4V3	Same 4.3 V nominal V_Z, but SOD-323 package (1.7 × 1.3 mm); higher Z_ZT (≤150 Ω); no AEC-Q101 rating	Larger footprint limits use in <1.0 mm pitch layouts; lacks automotive qualification	Select when cost sensitivity outweighs space constraints and automotive compliance is not required
MMSZ4V3ET1G	4.3 V V_Z, SOD-123 package (2.9 × 1.8 mm); 500 mW P_D; Z_ZT ≤ 90 Ω; AEC-Q101 qualified	Higher power rating suits higher-current clamping; larger size incompatible with ultra-dense layouts	Choose when thermal margin >250 mW is needed and PCB area permits 2.9 mm length

Compared with BZX584-C4V3 and MMSZ4V3ET1G, NZ9F4V3ST5G offers the smallest footprint among AEC-Q101-qualified 4.3 V Zeners, making it optimal for miniaturized automotive and portable designs where board space and qualification are jointly constrained.

Availability

NZ9F4V3ST5G is available at Aetrix Electronics and suitable for smartphone power rail protection, USB-C port overvoltage clamp, and automotive cabin infotainment MCU reset circuits requiring stable component supply with guaranteed long-term availability.

Supply support for NZ9F4V3ST5G 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

NZ9F4V3ST5G belongs to the NZ9F/SZNZ9F series of miniature Zener regulators engineered for high-density portable and automotive electronics where ultra-small footprint and AEC-Q101 reliability are mandatory.

FAQ

What is the nominal Zener voltage of NZ9F4V3ST5G?

The NZ9F4V3ST5G has a nominal Zener voltage of 4.3 V, with a specified range of 4.17 V to 4.43 V at a test current of 5 mA. This value is measured under standard conditions (T_A = 25°C) and reflects the device's primary function as a precision voltage reference or clamp. The tight ±5% tolerance supports consistent performance across production batches without calibration.

Is NZ9F4V3ST5G suitable for automotive applications?

Yes, NZ9F4V3ST5G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix variant explicitly designated for automotive and other applications requiring controlled manufacturing sites. Its −65°C to +150°C junction temperature range, 260°C reflow compatibility, and Class 3 ESD rating make it appropriate for cabin infotainment, body control modules, and ADAS sensor interfaces.

What package type does NZ9F4V3ST5G use?

NZ9F4V3ST5G uses the SOD−923 surface-mount package (Case 514AB), measuring 1.00 mm × 0.60 mm with a maximum height of 0.40 mm. This ultra-compact outline is optimized for high-density PCBs in smartphones, wearables, and automotive ECUs where board space is severely constrained.

What is the maximum power dissipation of NZ9F4V3ST5G?

NZ9F4V3ST5G has a steady-state power dissipation rating of 250 mW at ambient temperature (T_A = 25°C), derating linearly by 2.0 mW/°C above that temperature. This rating applies to FR-4 boards with minimum pad layout and determines safe continuous Zener current under thermal design constraints.

Does NZ9F4V3ST5G have Pb-free construction?

Yes, NZ9F4V3ST5G is a Pb-free device with 100% matte tin lead finish, compliant with RoHS Directive 2011/65/EU. The package uses void-free, transfer-molded thermosetting plastic meeting UL 94 V-0 flammability rating, ensuring environmental compliance without sacrificing solderability or reliability.

NZ9F4V3ST5G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-923

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 4.3 V

Tolerance:: ±3%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 1 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

NZ9F4V3ST5G FAQ

1.How can I place an order for NZ9F4V3ST5G through Aetrix?

Please submit a Request for Quotation (RFQ) for NZ9F4V3ST5G 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 NZ9F4V3ST5G reliable?

The price and inventory of NZ9F4V3ST5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NZ9F4V3ST5G is usually 5 days.

3.What payment methods are accepted for NZ9F4V3ST5G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NZ9F4V3ST5G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NZ9F4V3ST5G?

NZ9F4V3ST5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NZ9F4V3ST5G 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 NZ9F4V3ST5G?

For technical support, including NZ9F4V3ST5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NZ9F4V3ST5G requirements.

6.How does Aetrix verify that NZ9F4V3ST5G is sourced from the original manufacturer or authorized distributors?

All NZ9F4V3ST5G 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 NZ9F4V3ST5G meets industry standards.

7.What is the process for return or replacement of NZ9F4V3ST5G?

All NZ9F4V3ST5G units undergo pre-shipment inspection (PSI). If there is an issue with NZ9F4V3ST5G, 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 NZ9F4V3ST5G part is unused and in its original packaging.

Return procedure for NZ9F4V3ST5G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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