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

onsemi SZBZX84C9V1LT1G

Name: SZBZX84C9V1LT1G
Brand: onsemi
SKU: SZBZX84C9V1LT1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZBZX84C9V1LT1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: SZBZX84C9V1LT1G.pdf

Description:: DIODE ZENER 9.1V 250MW SOT23-3

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Product details

Overview

SZBZX84C9V1LT1G from onsemi is a 9.1 V ±5.5% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-4/FR-5 board, with 15 Ω dynamic impedance at 5 mA and 0.5 μA reverse leakage at 7.3 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable power rails.

For engineers reviewing the SZBZX84C9V1LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.5%), thermal coefficient (+3.8 mV/°C), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates in reverse-biased breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load or input conditions. Its 9.1 V nominal Zener voltage is specified at 5 mA test current with ±5.5% tolerance, and exhibits +3.8 mV/°C temperature coefficient - indicating predictable upward drift with rising junction temperature.

The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), enabling unidirectional clamping or regulation without internal series resistance. With 130 pF capacitance at 0 V bias and 1 MHz, it supports moderate-speed transient suppression while minimizing signal coupling in mixed-signal circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	9.1 V nominal, min 8.5 V / max 9.6 V at 5 mA - defines regulated output voltage window under standard test conditions
Zener Impedance (Z_ZT)	15 Ω at 5 mA - determines output voltage deviation under load current changes (e.g., ±15 mV per ±1 mA)
Reverse Leakage Current (I_R)	0.5 μA maximum at 7.3 V - ensures minimal quiescent current draw in standby or battery-powered modes
Power Dissipation (P_D)	250 mW on FR-4 board at 25°C - sets absolute maximum continuous power before thermal derating begins
Temperature Coefficient	+3.8 mV/°C at 5 mA - quantifies voltage drift per degree Celsius, critical for temperature-stable references
Capacitance (C)	130 pF at 0 V, 1 MHz - impacts high-frequency noise filtering and AC coupling behavior in signal paths
ESD Rating	Class 3 (>16 kV) per Human Body Model - enables direct handling and board-level integration without additional protection

Pinout & Package

SOT-23 (TO-236) surface-mount package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node; reverse-biased during regulation; must be held ≤ V_Z below cathode to avoid forward conduction
2	No Connection	Internally unconnected; electrically isolated; no PCB trace or pad required
3	Cathode	Connected to higher-potential node; source of regulated voltage; polarity band aligns with this terminal

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control modules and infotainment power supplies
Pb-free and RoHS compliant	Meets global environmental regulations; compatible with lead-free reflow soldering profiles up to 260°C for 10 seconds
Tight thermal coefficient control	+3.8 mV/°C enables <±1% total voltage variation across −55°C to +150°C junction range
Low leakage at sub-Zener voltage	0.5 μA max at 7.3 V allows use in ultra-low-power monitoring circuits without loading sensed nodes
High ESD immunity	>16 kV HBM rating eliminates need for external TVS diodes in handheld device I/O protection

Applications

Portable Power Monitoring	USB-C Power Delivery Clamp
Use Scenario: Monitoring battery voltage in Bluetooth earbuds to trigger low-battery alerts before shutdown. IC Role / Device Role / Timing Role: Zener reference providing stable 9.1 V threshold for comparator input against scaled-down battery voltage. Use Value: Enables accurate state-of-charge estimation within ±5% error across operating temperature, leveraging tight 9.1 V tolerance and +3.8 mV/°C TC.	Use Scenario: Clamping VBUS line transients during hot-plug events in USB-C accessories. IC Role / Device Role / Timing Role: Fast-acting shunt regulator diverting surge energy above 9.1 V to ground before downstream PMIC damage. Use Value: Absorbs 250 mW pulses without derating, supported by 15 Ω Z_ZT limiting clamping voltage overshoot to <9.3 V at 20 mA surge.
Automotive Sensor Biasing	Industrial PLC Input Protection
Use Scenario: Providing stable bias voltage for analog pressure sensor ICs in HVAC control modules. IC Role / Device Role / Timing Role: Precision voltage reference supplying excitation to bridge sensors, rejecting supply ripple via Zener regulation. Use Value: Maintains <±1% output stability from −40°C to +125°C ambient, validated under AEC-Q101 stress testing for 15-year field life.	Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp limiting input voltage to 9.1 V before Schottky front-end rectifier and optocoupler isolation stage. Use Value: Survives repeated 1 kV/μs fast transients due to >16 kV HBM ESD rating and robust SOT-23 package mechanical integrity.

Portable Power Monitoring

USB-C Power Delivery Clamp

Use Scenario: Monitoring battery voltage in Bluetooth earbuds to trigger low-battery alerts before shutdown.

IC Role / Device Role / Timing Role: Zener reference providing stable 9.1 V threshold for comparator input against scaled-down battery voltage.

Use Value: Enables accurate state-of-charge estimation within ±5% error across operating temperature, leveraging tight 9.1 V tolerance and +3.8 mV/°C TC.

Use Scenario: Clamping VBUS line transients during hot-plug events in USB-C accessories.

IC Role / Device Role / Timing Role: Fast-acting shunt regulator diverting surge energy above 9.1 V to ground before downstream PMIC damage.

Use Value: Absorbs 250 mW pulses without derating, supported by 15 Ω Z_ZT limiting clamping voltage overshoot to <9.3 V at 20 mA surge.

Automotive Sensor Biasing

Industrial PLC Input Protection

Use Scenario: Providing stable bias voltage for analog pressure sensor ICs in HVAC control modules.

IC Role / Device Role / Timing Role: Precision voltage reference supplying excitation to bridge sensors, rejecting supply ripple via Zener regulation.

Use Value: Maintains <±1% output stability from −40°C to +125°C ambient, validated under AEC-Q101 stress testing for 15-year field life.

Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from induced surges on factory floor wiring.

IC Role / Device Role / Timing Role: Primary overvoltage clamp limiting input voltage to 9.1 V before Schottky front-end rectifier and optocoupler isolation stage.

Use Value: Survives repeated 1 kV/μs fast transients due to >16 kV HBM ESD rating and robust SOT-23 package mechanical integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C9V1LT1G	Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and PPAP capability	Suitable for commercial-grade consumer electronics where automotive reliability is not required	Select when cost sensitivity outweighs automotive compliance needs and lifecycle assurance
SZBZX84B9V1LT1G	Tighter ±1.1% tolerance (8.92–9.28 V), same 15 Ω Z_ZT, identical package and thermal specs	Better suited for precision reference circuits requiring <±1% absolute accuracy over temperature	Choose when system-level calibration budget demands tighter initial voltage tolerance than ±5.5%

Compared with BZX84C9V1LT1G, SZBZX84C9V1LT1G adds automotive qualification and traceability; compared with SZBZX84B9V1LT1G, it trades ±1.1% tolerance for broader ±5.5% spec and lower unit cost in high-volume production.

Availability

SZBZX84C9V1LT1G is available at Aetrix Electronics and suitable for portable power monitoring, USB-C transient protection, automotive sensor biasing, and industrial PLC input protection requiring stable component supply and long-term manufacturability.

Supply support for SZBZX84C9V1LT1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

SZBZX84C9V1LT1G belongs to the SZBZX84CxxxLT1G automotive Zener diode family, designed specifically for reliable voltage regulation in harsh environments with extended temperature operation and AEC-Q101 validation.

FAQ

What is the Zener voltage tolerance of SZBZX84C9V1LT1G?

The SZBZX84C9V1LT1G has a nominal Zener voltage of 9.1 V with a tolerance of ±5.5%, meaning the actual breakdown voltage falls between 8.5 V and 9.6 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the onsemi datasheet (Rev. 23, August 2021), under the BZX84CxxxLT1 series specifications for SZBZX84C9V1LT1G.

Does SZBZX84C9V1LT1G support automotive applications?

Yes, SZBZX84C9V1LT1G is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control units, body electronics, and ADAS power conditioning. The "SZ" prefix explicitly denotes automotive-grade manufacturing controls and site-specific change management, as stated in the Features section of the onsemi datasheet.

What is the pin configuration of SZBZX84C9V1LT1G?

SZBZX84C9V1LT1G uses the SOT-23 package with pin 1 as anode, pin 2 as no connection (NC), and pin 3 as cathode - confirmed in the Marking Diagram and Mechanical Characteristics sections of the datasheet. The cathode is marked by a polarity band adjacent to pin 3, and pin 2 must remain unconnected on the PCB.

How much power can SZBZX84C9V1LT1G dissipate continuously?

SZBZX84C9V1LT1G is rated for 250 mW total power dissipation on FR-4 or FR-5 board at 25°C ambient, with thermal derating of 2.0 mW/°C above that temperature. This value is specified in the Maximum Ratings table (page 2) and applies only when mounted on standard PCB material per JEDEC standards.

Is SZBZX84C9V1LT1G RoHS compliant and lead-free?

Yes, SZBZX84C9V1LT1G is Pb-free and RoHS compliant, as explicitly stated in the Features section and Ordering Information table. The "G" suffix in the part number denotes Pb-free packaging, and the device meets EU RoHS Directive 2011/65/EU requirements without exemptions.

SZBZX84C9V1LT1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: SZBZX84CxxxLT1G

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:: 250 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)

SZBZX84C9V1LT1G FAQ

1.How can I place an order for SZBZX84C9V1LT1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZBZX84C9V1LT1G 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 SZBZX84C9V1LT1G reliable?

The price and inventory of SZBZX84C9V1LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C9V1LT1G is usually 5 days.

3.What payment methods are accepted for SZBZX84C9V1LT1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C9V1LT1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZBZX84C9V1LT1G?

SZBZX84C9V1LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZBZX84C9V1LT1G 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 SZBZX84C9V1LT1G?

For technical support, including SZBZX84C9V1LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C9V1LT1G requirements.

6.How does Aetrix verify that SZBZX84C9V1LT1G is sourced from the original manufacturer or authorized distributors?

All SZBZX84C9V1LT1G 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 SZBZX84C9V1LT1G meets industry standards.

7.What is the process for return or replacement of SZBZX84C9V1LT1G?

All SZBZX84C9V1LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C9V1LT1G, 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 SZBZX84C9V1LT1G part is unused and in its original packaging.

Return procedure for SZBZX84C9V1LT1G:

1.Submit a request within 90 days.

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

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