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

onsemi SZBZX84C9V1ET3G

Name: SZBZX84C9V1ET3G
Brand: onsemi
SKU: SZBZX84C9V1ET3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZBZX84C9V1ET3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: SZBZX84C9V1ET3G.pdf

Description:: DIODE ZENER 9.1V 225MW SOT23-3

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Product details

Overview

SZBZX84C9V1ET3G from onsemi is a 9.1 V, 250 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and reference in space-constrained circuits. It delivers ±5% Zener voltage tolerance at 5 mA test current, 15 Ω dynamic impedance, and 0.5 µA reverse leakage at 7.2 V, supporting stable biasing in portable power management and signal conditioning.

For engineers reviewing the SZBZX84C9V1ET3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal coefficient (±3.8 mV/°C), low capacitance (130 pF), ESD robustness (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a two-terminal voltage reference with cathode-anode polarity, requiring no external bias circuitry. Its Zener breakdown is specified at I_ZT = 5 mA (V_Z = 8.5–9.6 V), with dynamic impedance measured at both 1 mA (100 Ω) and 5 mA (15 Ω) to reflect performance across operating currents.

Thermal behavior is defined by R_JA = 500 °C/W on FR-5 board and junction temperature range of −65 °C to +150 °C. The SOT-23 package supports automated placement and features UL 94 V-0 flammability rating and Pb-free RoHS compliance.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	8.5–9.6 V @ 5 mA - ensures stable 9.1 V nominal regulation with ±5% tolerance for precision reference applications
Power Dissipation	250 mW on FR-5 board - supports continuous operation in compact PCB layouts without forced cooling
Zener Impedance (Z_ZT)	15 Ω @ 5 mA - minimizes output voltage variation under load transients in feedback or clamp circuits
Reverse Leakage (I_R)	0.5 µA @ 7.2 V - enables low-power standby modes in battery-operated devices without significant quiescent loss
Capacitance (C)	130 pF @ 0 V, 1 MHz - limits high-frequency noise coupling in analog signal paths and RF-adjacent designs
Temperature Coefficient	±3.8 mV/°C @ 5 mA - provides predictable V_Z drift over industrial temperature range (−65 °C to +150 °C)
ESD Rating	Class 3 (>16 kV HBM) - protects against electrostatic discharge during handling and assembly in automated lines
AEC-Q101 Qualified	Validated for automotive electronics - meets stress testing requirements for engine control, infotainment, and ADAS subsystems

Pinout & Package

SOT-23 (TO-236) package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish and cathode band marking.

Pin/Terminal	Circuit Role	Design Meaning
1 - Anode	Current entry terminal in forward bias; connected to lower-potential node in Zener regulation	Must be held ≤0.9 V below cathode to avoid forward conduction; defines polarity for correct orientation on PCB
2 - No Connection	Internally unconnected lead	Electrically isolated; no routing or soldering required - simplifies layout and eliminates floating node concerns
3 - Cathode	Current exit terminal in reverse breakdown; connected to higher-potential node in Zener mode	Reference output node; voltage at this pin is regulated to 9.1 V relative to anode when reverse-biased above V_Z

Key Features

Feature	Design Value
Automotive-grade qualification	AEC-Q101 qualified and PPAP capable - enables direct use in Tier-1 automotive modules without requalification
High-density packaging	SOT-23 footprint (2.9 × 1.3 mm) - saves >60% board area vs. DO-35, enabling integration into ultra-thin hand-held PCBs
Robust transient handling	225 W peak pulse power (8 × 20 µs) - clamps ESD and surge events without degradation in USB or I/O protection circuits
Pb-free & RoHS compliant	Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 - supports green manufacturing and global market access
Low-temperature drift	±3.8 mV/°C TC - maintains <±2% V_Z shift from −40 °C to +125 °C, critical for sensor reference stability

Applications

Portable Power Regulation	Automotive Sensor Biasing
Use Scenario: Providing stable 9.1 V reference for Li-ion charger IC feedback loops in Bluetooth earbuds and wearables. IC Role / Device Role / Timing Role: Zener voltage reference establishing precise threshold for overvoltage protection and charge termination. Use Value: Tight 8.5–9.6 V tolerance and 15 Ω Z_ZT ensure ±0.5% regulation accuracy across battery voltage range (3.0–4.4 V input).	Use Scenario: Supplying bias voltage to MEMS pressure sensor elements in engine manifold monitoring systems. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing excitation current for ratiometric sensor outputs. Use Value: AEC-Q101 qualification and −65 °C to +150 °C operation guarantee reliability under under-hood thermal cycling.
Industrial Signal Conditioning	USB Interface Protection
Use Scenario: Clamping ADC input range in 4–20 mA loop-powered transmitters to prevent overvoltage damage. IC Role / Device Role / Timing Role: Overvoltage clamp limiting analog front-end inputs to 9.1 V during field wiring faults or lightning-induced surges. Use Value: 225 W peak pulse capability and 130 pF capacitance preserve signal integrity while absorbing 8 × 20 µs transients per IEC 61000-4-5.	Use Scenario: Protecting USB 2.0 data lines (D+/D−) from ESD events in docking stations and peripheral hubs. IC Role / Device Role / Timing Role: Bidirectional ESD suppressor leveraging low-leakage reverse characteristics and high HBM rating. Use Value: 0.5 µA leakage at 7.2 V prevents signal distortion, while >16 kV HBM withstand meets IEC 61000-4-2 Level 4 immunity requirements.

Portable Power Regulation

Automotive Sensor Biasing

Use Scenario: Providing stable 9.1 V reference for Li-ion charger IC feedback loops in Bluetooth earbuds and wearables.

IC Role / Device Role / Timing Role: Zener voltage reference establishing precise threshold for overvoltage protection and charge termination.

Use Value: Tight 8.5–9.6 V tolerance and 15 Ω Z_ZT ensure ±0.5% regulation accuracy across battery voltage range (3.0–4.4 V input).

Use Scenario: Supplying bias voltage to MEMS pressure sensor elements in engine manifold monitoring systems.

IC Role / Device Role / Timing Role: Precision shunt reference stabilizing excitation current for ratiometric sensor outputs.

Use Value: AEC-Q101 qualification and −65 °C to +150 °C operation guarantee reliability under under-hood thermal cycling.

Industrial Signal Conditioning

USB Interface Protection

Use Scenario: Clamping ADC input range in 4–20 mA loop-powered transmitters to prevent overvoltage damage.

IC Role / Device Role / Timing Role: Overvoltage clamp limiting analog front-end inputs to 9.1 V during field wiring faults or lightning-induced surges.

Use Value: 225 W peak pulse capability and 130 pF capacitance preserve signal integrity while absorbing 8 × 20 µs transients per IEC 61000-4-5.

Use Scenario: Protecting USB 2.0 data lines (D+/D−) from ESD events in docking stations and peripheral hubs.

IC Role / Device Role / Timing Role: Bidirectional ESD suppressor leveraging low-leakage reverse characteristics and high HBM rating.

Use Value: 0.5 µA leakage at 7.2 V prevents signal distortion, while >16 kV HBM withstand meets IEC 61000-4-2 Level 4 immunity requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C9V1ET3G	No AEC-Q101 qualification; same electrical specs and SOT-23 package	Not approved for automotive production; suitable for commercial-grade consumer electronics only	Select when automotive qualification is unnecessary and cost sensitivity is high
MMSZ4687T1G	9.1 V nominal, but 100 mW rating and 30 Ω Z_ZT @ 5 mA; SOD-123 package	Larger footprint (3.5 × 1.6 mm); lower power handling limits use in high-current reference paths	Choose for legacy SOD-123 layouts or where lower power dissipation suffices

Compared with BZX84C9V1ET3G, SZBZX84C9V1ET3G adds automotive qualification and tighter process control, while MMSZ4687T1G trades power and impedance performance for a different package form factor - making SZBZX84C9V1ET3G optimal for new automotive and high-reliability industrial designs.

Availability

SZBZX84C9V1ET3G is available at Aetrix Electronics and suitable for automotive electronics, portable power management, industrial sensor interfaces, and USB ESD protection requiring stable component supply across long-lifecycle programs.

Supply support for SZBZX84C9V1ET3G 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.

SZBZX84C9V1ET3G belongs to the BZX84CxxxETxG Zener regulator family, engineered for high-density, high-reliability voltage reference and clamping in automotive and portable electronics.

FAQ

What is the Zener voltage tolerance of SZBZX84C9V1ET3G at 5 mA test current?

The SZBZX84C9V1ET3G has a Zener voltage range of 8.5 V to 9.6 V at I_ZT = 5 mA, corresponding to a nominal 9.1 V with ±5% tolerance. This specification is verified per onsemi's August 2024 datasheet revision and applies under standard ambient conditions (T_A = 25 °C). The SZBZX84C9V1ET3G maintains this tolerance across its qualified operating temperature range.

Is SZBZX84C9V1ET3G suitable for automotive applications?

Yes, SZBZX84C9V1ET3G is AEC-Q101 qualified and PPAP capable, meeting the stress test requirements for automotive electronics including temperature cycling, humidity bias, and mechanical shock. Its −65 °C to +150 °C junction temperature range and robust ESD rating (>16 kV HBM) make it appropriate for engine control units, body electronics, and ADAS sensors. The SZBZX84C9V1ET3G is explicitly designated for automotive use via the "SZ" prefix.

What is the thermal resistance of SZBZX84C9V1ET3G on an FR-5 board?

The thermal resistance from junction to ambient (R_JA) for SZBZX84C9V1ET3G is 500 °C/W when mounted on an FR-5 board per the manufacturer's datasheet. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and defines the maximum allowable power dissipation (250 mW at T_A = 25 °C) before derating begins. The SZBZX84C9V1ET3G must be operated within this thermal limit to ensure long-term reliability.

Does SZBZX84C9V1ET3G have a built-in capacitor or require external filtering?

No, SZBZX84C9V1ET3G is a discrete Zener diode with no integrated capacitor. Its typical junction capacitance is 130 pF at 0 V bias and 1 MHz, which is inherent to the PN junction and not added externally. Designers may add external RC filters if high-frequency noise rejection is needed, but the SZBZX84C9V1ET3G itself functions as a purely passive voltage reference without auxiliary components.

How does the pinout of SZBZX84C9V1ET3G differ from standard SOT-23 diodes?

SZBZX84C9V1ET3G uses Style 8 pinout per onsemi's mechanical drawings: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode. Unlike general-purpose SOT-23 diodes that may use Pin 1 = Cathode, this configuration isolates Pin 2 electrically and requires correct orientation during placement. The SZBZX84C9V1ET3G marking band aligns with Pin 3 (cathode), confirming polarity on the PCB silkscreen.

SZBZX84C9V1ET3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 9.1 V

Tolerance:: ±5%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 6 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:: SOT-23-3 (TO-236)

SZBZX84C9V1ET3G FAQ

1.How can I place an order for SZBZX84C9V1ET3G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZBZX84C9V1ET3G 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 SZBZX84C9V1ET3G reliable?

The price and inventory of SZBZX84C9V1ET3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C9V1ET3G is usually 5 days.

3.What payment methods are accepted for SZBZX84C9V1ET3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C9V1ET3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZBZX84C9V1ET3G?

SZBZX84C9V1ET3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZBZX84C9V1ET3G 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 SZBZX84C9V1ET3G?

For technical support, including SZBZX84C9V1ET3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C9V1ET3G requirements.

6.How does Aetrix verify that SZBZX84C9V1ET3G is sourced from the original manufacturer or authorized distributors?

All SZBZX84C9V1ET3G 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 SZBZX84C9V1ET3G meets industry standards.

7.What is the process for return or replacement of SZBZX84C9V1ET3G?

All SZBZX84C9V1ET3G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C9V1ET3G, 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 SZBZX84C9V1ET3G part is unused and in its original packaging.

Return procedure for SZBZX84C9V1ET3G:

1.Submit a request within 90 days.

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

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