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

onsemi SZBZX84C9V1ET1G

Name: SZBZX84C9V1ET1G
Brand: onsemi
SKU: SZBZX84C9V1ET1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SZBZX84C9V1ET1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: SZBZX84C9V1ET1G.pdf

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

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Product details

Overview

SZBZX84C9V1ET1G from onsemi is a 9.1 V, 250 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and reference applications with ±0.5 V tolerance at 5 mA test current, 15 Ω dynamic impedance, and 0.5 µA reverse leakage at 7.2 V. It serves as a stable shunt regulator in power supply feedback loops, overvoltage protection circuits, and voltage reference stages in portable electronics.

For engineers reviewing the SZBZX84C9V1ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (9.1 V), power dissipation (250 mW on FR-5), temperature coefficient (+3.8 mV/°C), ESD rating (>16 kV HBM), and SOT-23 footprint compatibility with automated assembly.

Technical Context

This device operates as a silicon planar Zener diode with sharp reverse breakdown at 9.1 V, optimized for low-current regulation (1–20 mA range) and stable DC reference generation. Its thermal resistance of 500 °C/W on FR-5 board and junction temperature range of −65 °C to +150 °C support operation in compact, thermally constrained environments.

The SOT-23 package features cathode-indicated polarity band, Pb-free RoHS-compliant construction, and UL 94 V-0 flammability rating. Pin 2 is internally unconnected - only pins 1 (anode) and 3 (cathode) are electrically active - enabling simple two-terminal integration into biasing and clamping networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	8.5–9.6 V @ 5 mA; ensures stable 9.1 V reference under typical bias conditions
Power Dissipation	250 mW on FR-5 board; supports continuous regulation without heatsinking in space-constrained PCBs
Zener Impedance Z_ZT	15 Ω @ 5 mA; minimizes output voltage variation under load transients
Reverse Leakage I_R	0.5 µA @ 7.2 V; guarantees low quiescent current in battery-powered standby circuits
Temp Coefficient TC	+3.8 mV/°C @ 5 mA; enables predictable drift compensation in temperature-sensitive references
Capacitance C	130 pF @ 0 V, 1 MHz; limits high-frequency noise coupling in analog signal paths
ESD Rating	Class 3 (>16 kV HBM); withstands handling and board-level electrostatic discharge without degradation

Pinout & Package

SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant solderable finish. Cathode identified by band; maximum solder temperature 260 °C for 10 seconds.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node in shunt configuration; carries forward current during conduction
2	No Connection	Internally isolated; no electrical function - must remain unconnected on PCB
3	Cathode	Connected to regulated voltage node; defines Zener breakdown reference point

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock
Pb-free & RoHS compliant	Meets global environmental compliance requirements for industrial and consumer end equipment
Optimized for automated assembly	Standard SOT-23 footprint and marking enable high-yield pick-and-place and reflow processing
Low capacitance (130 pF)	Reduces signal distortion in high-speed clamp or reference applications near RF sections
High ESD immunity (>16 kV HBM)	Eliminates need for external ESD protection in handheld and portable designs

Applications

Power Supply Feedback	Battery Protection Circuit
Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loop using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 9.1 V threshold to control PWM duty cycle via error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations without requiring external op-amp or precision resistor network.	Use Scenario: Overvoltage cutoff in single-cell Li-ion charger management before cell damage occurs. IC Role / Device Role / Timing Role: Clamping element that conducts when battery voltage exceeds 9.1 V, triggering MOSFET gate shutdown. Use Value: Prevents >4.35 V cell stress with sub-1 µA standby leakage, extending cycle life and safety margin.
ADC Reference Stabilization	Signal Level Shifting
Use Scenario: Providing stable reference voltage to 12-bit SAR ADC in portable medical sensor module. IC Role / Device Role / Timing Role: Low-noise DC reference source replacing higher-cost bandgap ICs in low-power acquisition path. Use Value: Enables <±0.5 LSB INL error at 9.1 V reference with <15 Ω impedance limiting code jitter from supply ripple.	Use Scenario: Translating 3.3 V logic signals to 9.1 V interface level for industrial PLC input stage. IC Role / Device Role / Timing Role: Bidirectional level translator using Zener clamping to define upper rail while preserving edge integrity. Use Value: Achieves clean 9.1 V high-state with <1 ns propagation delay and no active components or timing skew.

Power Supply Feedback

Battery Protection Circuit

Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loop using optocoupler-coupled TL431 alternative.

IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 9.1 V threshold to control PWM duty cycle via error amplifier input.

Use Value: Maintains ±1% output regulation across line/load variations without requiring external op-amp or precision resistor network.

Use Scenario: Overvoltage cutoff in single-cell Li-ion charger management before cell damage occurs.

IC Role / Device Role / Timing Role: Clamping element that conducts when battery voltage exceeds 9.1 V, triggering MOSFET gate shutdown.

Use Value: Prevents >4.35 V cell stress with sub-1 µA standby leakage, extending cycle life and safety margin.

ADC Reference Stabilization

Signal Level Shifting

Use Scenario: Providing stable reference voltage to 12-bit SAR ADC in portable medical sensor module.

IC Role / Device Role / Timing Role: Low-noise DC reference source replacing higher-cost bandgap ICs in low-power acquisition path.

Use Value: Enables <±0.5 LSB INL error at 9.1 V reference with <15 Ω impedance limiting code jitter from supply ripple.

Use Scenario: Translating 3.3 V logic signals to 9.1 V interface level for industrial PLC input stage.

IC Role / Device Role / Timing Role: Bidirectional level translator using Zener clamping to define upper rail while preserving edge integrity.

Use Value: Achieves clean 9.1 V high-state with <1 ns propagation delay and no active components or timing skew.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C9V1ET1G	Non-automotive grade; lacks AEC-Q101 qualification and SZ-prefix process controls	Suitable for commercial-grade consumer products but not automotive or industrial safety-critical systems	Select when cost sensitivity outweighs automotive qualification requirements
MMSZ4687T1G	Same 9.1 V nominal Zener, but 500 mW rating and SOD-123 package; higher power, larger footprint	Better suited for higher-current regulation (>20 mA) or elevated ambient temperatures where thermal derating is critical	Choose when board layout allows larger package and >250 mW dissipation is required

Compared with BZX84C9V1ET1G and MMSZ4687T1G, SZBZX84C9V1ET1G uniquely combines AEC-Q101 qualification, SOT-23 miniaturization, and 250 mW capability - making it optimal for space-limited automotive modules needing certified reliability without thermal overhead.

Availability

SZBZX84C9V1ET1G is available at Aetrix Electronics and suitable for automotive infotainment power rails, portable medical sensor references, and industrial IoT node voltage supervision requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for SZBZX84C9V1ET1G 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.

The SZBZX84CxxxET1G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for high-reliability, space-constrained shunt regulation in automotive and industrial systems demanding AEC-Q101 compliance.

FAQ

What is the exact Zener voltage tolerance of SZBZX84C9V1ET1G at 5 mA test current?

The SZBZX84C9V1ET1G has a guaranteed Zener voltage range of 8.5 V to 9.6 V at 5 mA test current (IZT), with nominal value 9.1 V. This ±0.5 V tolerance reflects manufacturing spread under standard JEDEC test conditions and is verified per onsemi's BZX84CxxxET1G Series datasheet Rev. 11 (August 2024). The SZBZX84C9V1ET1G maintains this specification across its full operating temperature range.

Does SZBZX84C9V1ET1G support automotive applications?

Yes, SZBZX84C9V1ET1G is AEC-Q101 qualified and PPAP capable, with process controls and site-specific change management enabled by the "SZ" prefix. It meets automotive reliability requirements including temperature cycling, mechanical shock, and humidity testing - making it suitable for engine control units, body electronics, and ADAS power conditioning where certified Zener stability is required.

What is the thermal resistance of SZBZX84C9V1ET1G on FR-5 board?

The thermal resistance from junction-to-ambient (R_JA) for SZBZX84C9V1ET1G is 500 °C/W when mounted on FR-5 board at TA = 25 °C. This value assumes standard JEDEC 2s2p pad layout and defines the maximum allowable power dissipation before exceeding the 150 °C junction limit - confirming SZBZX84C9V1ET1G's suitability for passive regulation in thermally dense layouts.

Is pin 2 of SZBZX84C9V1ET1G electrically functional?

No, pin 2 of SZBZX84C9V1ET1G is internally unconnected (NC) per onsemi's mechanical outline documentation (Style 8, CASE 318). Only pins 1 (anode) and 3 (cathode) carry current. PCB layout must leave pin 2 floating - no trace, pad, or thermal connection - to avoid unintended parasitic coupling or mechanical stress on the die bond wire.

What is the maximum reverse leakage current for SZBZX84C9V1ET1G?

The maximum reverse leakage current (I_R) for SZBZX84C9V1ET1G is 0.5 µA at VR = 7.2 V and TA = 25 °C, as specified in the Electrical Characteristics table. This low leakage ensures minimal standby power draw in battery-backed systems and preserves accuracy in high-impedance reference nodes where even nanoampere currents cause measurable offset.

SZBZX84C9V1ET1G 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)

SZBZX84C9V1ET1G FAQ

1.How can I place an order for SZBZX84C9V1ET1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SZBZX84C9V1ET1G 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 SZBZX84C9V1ET1G reliable?

The price and inventory of SZBZX84C9V1ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84C9V1ET1G is usually 5 days.

3.What payment methods are accepted for SZBZX84C9V1ET1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84C9V1ET1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SZBZX84C9V1ET1G?

SZBZX84C9V1ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SZBZX84C9V1ET1G 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 SZBZX84C9V1ET1G?

For technical support, including SZBZX84C9V1ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84C9V1ET1G requirements.

6.How does Aetrix verify that SZBZX84C9V1ET1G is sourced from the original manufacturer or authorized distributors?

All SZBZX84C9V1ET1G 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 SZBZX84C9V1ET1G meets industry standards.

7.What is the process for return or replacement of SZBZX84C9V1ET1G?

All SZBZX84C9V1ET1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84C9V1ET1G, 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 SZBZX84C9V1ET1G part is unused and in its original packaging.

Return procedure for SZBZX84C9V1ET1G:

1.Submit a request within 90 days.

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

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