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

onsemi SZNZ9F3V9T5G

Name: SZNZ9F3V9T5G
Brand: onsemi
SKU: SZNZ9F3V9T5G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZNZ9F3V9T5G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: SOD-923

Datasheet:: SZNZ9F3V9T5G.pdf

Description:: DIODE ZENER 3.91V 250MW SOD923

Quantity:: RFQ Add To RFQ list

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Inventory:7,990

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Product details

Overview

SZNZ9F3V9T5G from onsemi is an AEC-Q101-qualified Zener diode in SOD-923 package, providing precision 3.71–4.10 V voltage regulation at 5 mA test current, with 100 Ω max Zener impedance, 5 μA max leakage at 3.15 V, and −2.5 mV/°C temperature coefficient. It delivers 250 mW steady-state power dissipation for overvoltage clamping in space-constrained portable electronics.

For engineers reviewing the SZNZ9F3V9T5G datasheet, pinout, applications, or equivalent options, key selection criteria include its automotive-grade qualification, 16 kV HBM ESD rating, low 0.40 mm height, and tight ±5% Zener voltage tolerance - critical for battery monitoring, USB port protection, and low-voltage logic rail stabilization.

Technical Context

This device operates as a two-terminal voltage reference and transient suppressor, leveraging silicon PN junction Zener breakdown at nominal 3.9 V. Its thermal resistance (500 °C/W) and derating curve (2.0 mW/°C above 25 °C) define safe operating limits on FR-4 PCBs with minimum pad layout.

The SOD-923 package enables high-density placement with cathode-anode polarity marking, 100% matte tin lead finish, and MSL 1 reflow compatibility up to 260 °C. Electrical behavior is characterized at 25 °C with pulse-tested I_ZT = 5 mA and specified capacitance of 210 pF at 0 V and 1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.71–4.10 V @ I_ZT = 5 mA - defines stable clamping threshold for 3.3 V system rails
Power Dissipation (P_D)	250 mW @ T_A = 25 °C - supports continuous regulation without heatsinking in handheld PCBs
Zener Impedance (Z_ZT)	≤100 Ω @ I_ZT = 5 mA - ensures minimal voltage shift under load variation in feedback paths
Leakage Current (I_R)	≤5 μA @ V_R = 3.15 V - prevents excessive standby current in battery-powered sensors
ESD Rating	Class 3 (>16 kV HBM) - protects against human-hand electrostatic discharge in consumer assembly lines
Temperature Coefficient	−2.5 mV/°C - enables predictable drift compensation in automotive cabin temperature ranges
Capacitance (C)	210 pF @ V_R = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability in RF front-end bias networks

Pinout & Package

Package: SOD-923 (Case 514AB), dimensions 1.00 mm × 0.60 mm × 0.40 mm, cathode-marked with polarity band, MSL 1, Pb-free, RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to regulated voltage node; accepts reverse-bias current during Zener conduction
2	Anode	Ground or reference return path; completes current loop during overvoltage events

Key Features

Feature	Design Value
AEC-Q101 Qualified	Validated for automotive under-hood and infotainment applications requiring zero defect reliability
Low Profile (0.40 mm)	Enables stacking beneath connectors or under narrow FPC flex cables in ultra-thin mobile designs
16 kV HBM ESD	Eliminates need for external ESD diodes in USB Type-C and microSD interface protection circuits
Tight V_Z Tolerance (±5%)	Reduces binning requirements and simplifies BOM management across multiple 3.3 V subsystems
Pb-Free / Halogen-Free	Meets IPC-J-STD-609 Category 1 and EU Directive 2015/863 for industrial and medical end equipment

Applications

Smartphone Battery Monitoring	USB-C Port Overvoltage Protection
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging cycles in compact smartphone PCBs. IC Role / Device Role / Timing Role: Zener reference for ADC input scaling and comparator threshold setting in fuel gauge ICs. Use Value: Stable 3.9 V reference enables ±1% state-of-charge accuracy despite ambient temperature swings from −20 to +85 °C.	Use Scenario: Clamping transient surges on VBUS line during hot-plug insertion of USB-C accessories. IC Role / Device Role / Timing Role: Fast-response shunt regulator absorbing >100 V spikes before they reach USB controller ICs. Use Value: 250 mW power rating and 100 Ω Z_ZT limit VBUS overshoot to <4.5 V for <100 ns, preventing PHY latch-up.
Automotive Cabin Control Panel	Industrial IoT Sensor Node
Use Scenario: Regulating 3.3 V supply for touch controller and LED driver in dashboard display modules. IC Role / Device Role / Timing Role: Primary voltage clamp protecting downstream logic from alternator load dump transients. Use Value: AEC-Q101 qualification and −2.5 mV/°C TC ensure consistent operation across −40 to +125 °C ambient range.	Use Scenario: Providing stable bias voltage for MEMS accelerometer and BLE radio in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: Low-leakage (5 μA) reference source enabling multi-year coin-cell battery life. Use Value: 210 pF capacitance minimally loads 1 MHz clock signals in sensor signal chains while maintaining regulation integrity.

Smartphone Battery Monitoring

USB-C Port Overvoltage Protection

Use Scenario: Monitoring Li-ion cell voltage during charging/discharging cycles in compact smartphone PCBs.

IC Role / Device Role / Timing Role: Zener reference for ADC input scaling and comparator threshold setting in fuel gauge ICs.

Use Value: Stable 3.9 V reference enables ±1% state-of-charge accuracy despite ambient temperature swings from −20 to +85 °C.

Use Scenario: Clamping transient surges on VBUS line during hot-plug insertion of USB-C accessories.

IC Role / Device Role / Timing Role: Fast-response shunt regulator absorbing >100 V spikes before they reach USB controller ICs.

Use Value: 250 mW power rating and 100 Ω Z_ZT limit VBUS overshoot to <4.5 V for <100 ns, preventing PHY latch-up.

Automotive Cabin Control Panel

Industrial IoT Sensor Node

Use Scenario: Regulating 3.3 V supply for touch controller and LED driver in dashboard display modules.

IC Role / Device Role / Timing Role: Primary voltage clamp protecting downstream logic from alternator load dump transients.

Use Value: AEC-Q101 qualification and −2.5 mV/°C TC ensure consistent operation across −40 to +125 °C ambient range.

Use Scenario: Providing stable bias voltage for MEMS accelerometer and BLE radio in battery-operated condition monitoring nodes.

IC Role / Device Role / Timing Role: Low-leakage (5 μA) reference source enabling multi-year coin-cell battery life.

Use Value: 210 pF capacitance minimally loads 1 MHz clock signals in sensor signal chains while maintaining regulation integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584-C3V9	3.9 V ±5%, 300 mW P_D, SOD-323 package (1.7 × 1.3 mm), 250 Ω Z_ZT	Larger footprint and higher Z_ZT reduce suitability for ultra-dense layouts and precision references	Select when higher power margin is needed and board area permits larger SOD-323 placement
MMSZ4685	3.9 V ±5%, 500 mW P_D, SOD-123 package (3.7 × 1.6 mm), 150 Ω Z_ZT, no AEC-Q101	Higher power but lacks automotive qualification and has 3.7× larger footprint than SOD-923	Prefer for non-automotive industrial power supplies where size is secondary to surge energy handling

Compared with BZX584-C3V9 and MMSZ4685, the SZNZ9F3V9T5G offers the smallest footprint (1.0 × 0.6 mm), lowest profile (0.4 mm), and only part in this group qualified to AEC-Q101 - making it optimal for automotive and premium portable designs demanding miniaturization and reliability.

Availability

SZNZ9F3V9T5G is available at Aetrix Electronics and suitable for smartphone battery monitoring, USB-C port protection, and automotive cabin control panels requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SZNZ9F3V9T5G 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 NZ9F/SZNZ9F series was designed specifically for space-constrained, high-reliability voltage regulation - targeting portable electronics, automotive infotainment, and industrial sensor interfaces where SOD-923's miniature form factor and AEC-Q101 compliance deliver decisive design advantages.

FAQ

What is the Zener voltage tolerance of SZNZ9F3V9T5G?

The SZNZ9F3V9T5G has a Zener voltage range of 3.71 V to 4.10 V at I_ZT = 5 mA, corresponding to a ±5% tolerance about the nominal 3.9 V value. This tolerance is guaranteed across manufacturing lots and validated per onsemi's AEC-Q101 stress testing protocol, ensuring consistent performance in production assemblies without post-manufacture sorting.

Is SZNZ9F3V9T5G suitable for automotive applications?

Yes, SZNZ9F3V9T5G is AEC-Q101 qualified and PPAP capable, with full traceability, lot-level reliability data, and validation across temperature cycling, humidity, and mechanical shock tests. Its −40 °C to +150 °C junction temperature range and −2.5 mV/°C temperature coefficient make it appropriate for engine control unit (ECU) sub-circuits and cabin infotainment power rails.

What is the maximum reverse leakage current for SZNZ9F3V9T5G?

The maximum reverse leakage current for SZNZ9F3V9T5G is 5 μA at V_R = 3.15 V and T_A = 25 °C. This low leakage supports multi-year battery life in always-on sensor nodes and ensures minimal loading on high-impedance voltage divider networks used in precision analog measurement circuits.

Does SZNZ9F3V9T5G have ESD protection built-in?

Yes, SZNZ9F3V9T5G is rated Class 3 per Human Body Model (HBM) with >16 kV ESD withstand capability. This intrinsic protection eliminates the need for discrete ESD diodes in many I/O protection schemes, reducing component count and PCB area in USB, SIM card, and button interface circuits.

What is the thermal resistance of SZNZ9F3V9T5G on FR-4 board?

The junction-to-ambient thermal resistance (R_JA) of SZNZ9F3V9T5G is 500 °C/W when mounted on an FR-4 board with minimum pad layout. This value determines the allowable power dissipation at elevated ambient temperatures - for example, at 75 °C ambient, maximum safe power drops to 150 mW using the 2.0 mW/°C derating factor.

SZNZ9F3V9T5G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOD-923

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3.91 V

Tolerance:: ±5%

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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-923

SZNZ9F3V9T5G FAQ

1.How can I place an order for SZNZ9F3V9T5G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZNZ9F3V9T5G 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 SZNZ9F3V9T5G reliable?

The price and inventory of SZNZ9F3V9T5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNZ9F3V9T5G is usually 5 days.

3.What payment methods are accepted for SZNZ9F3V9T5G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNZ9F3V9T5G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZNZ9F3V9T5G?

SZNZ9F3V9T5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZNZ9F3V9T5G 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 SZNZ9F3V9T5G?

For technical support, including SZNZ9F3V9T5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNZ9F3V9T5G requirements.

6.How does Aetrix verify that SZNZ9F3V9T5G is sourced from the original manufacturer or authorized distributors?

All SZNZ9F3V9T5G 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 SZNZ9F3V9T5G meets industry standards.

7.What is the process for return or replacement of SZNZ9F3V9T5G?

All SZNZ9F3V9T5G units undergo pre-shipment inspection (PSI). If there is an issue with SZNZ9F3V9T5G, 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 SZNZ9F3V9T5G part is unused and in its original packaging.

Return procedure for SZNZ9F3V9T5G:

1.Submit a request within 90 days.

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

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