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

onsemi BZX84C9V1ET1G

Name: BZX84C9V1ET1G
Brand: onsemi
SKU: BZX84C9V1ET1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C9V1ET1G

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C9V1ET1G.pdf

Description:: DIODE ZENER 9.1V 225MW SOT23

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Product details

Overview

BZX84C9V1ET1G from onsemi is a 9.1 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board, with 15 Ω dynamic impedance at 5 mA test current and 0.5 µA reverse leakage at 7.0 V, used for precision voltage reference and overvoltage protection in portable power rails.

For engineers reviewing the BZX84C9V1ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, temperature coefficient (+3.8 mV/°C), ESD robustness (>16 kV HBM), low capacitance (130 pF at 0 V), and SOT-23 compatibility with high-density automated assembly.

Technical Context

This device operates as a two-terminal voltage regulator via controlled reverse breakdown, with specified Zener voltage measured under pulsed 5 mA test current (IZT1) at 25°C ambient. Its thermal resistance is 500 °C/W on FR-5 board, enabling stable regulation up to +150°C junction temperature.

The SOT-23 package features a cathode band marking, no internal connection on pin 2, and supports reflow soldering up to 260°C for 10 seconds. It meets AEC-Q101 requirements when ordered with SZ prefix and complies with RoHS and Pb-free directives.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	8.5–9.6 V @ 5 mA - tight 9.1 V nominal with ±5.5% tolerance ensures stable reference in 9 V rail clamping.
Dynamic Impedance (Z_ZT)	15 Ω @ 5 mA - low AC impedance maintains regulation accuracy under varying load currents.
Reverse Leakage (I_R)	0.5 µA @ 7.0 V - minimal standby current preserves battery life in always-on portable circuits.
Power Dissipation (P_D)	250 mW on FR-5 board - defines maximum continuous DC power handling before thermal derating begins.
Temperature Coefficient	+3.8 mV/°C @ 5 mA - positive TC enables predictable drift compensation in temperature-sensitive references.
Capacitance (C)	130 pF @ 0 V, 1 MHz - low junction capacitance avoids signal coupling issues in RF-adjacent bias networks.
ESD Rating	Class 3 (>16 kV HBM) - withstands human-body model discharge without parameter shift or failure.

Pinout & Package

SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting epoxy, cathode indicated by band, UL 94 V-0 flammability rating, 260°C max soldering temperature for 10 s.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node; reverse-biased during regulation; carries forward current if forward-conducted.
2	No Connection	Internally unconnected; must remain floating-no PCB trace or pad tie required.
3	Cathode	Connected to regulated voltage node; polarity band identifies this terminal; sinks Zener current during breakdown.

Key Features

Feature	Design Value
250 mW Power Rating	Enables use in space-constrained 3.3 V/5 V/9 V auxiliary rails without heatsinking on standard FR-5 PCBs.
130 pF Junction Capacitance	Minimizes loading on high-frequency bias nodes, supporting clean operation near RF sections or clock lines.
Class 3 ESD Robustness	Eliminates need for external ESD protection in handheld product front-end interfaces and button debounce circuits.
Pb-Free & RoHS Compliant	Meets global environmental compliance mandates without performance trade-offs or assembly process changes.
Automated Assembly Optimized	Standard SOT-23 footprint and lead geometry ensure reliable pick-and-place yield and reflow joint integrity.

Applications

USB Power Input Protection	Li-ion Battery Voltage Monitor
Use Scenario: Clamps transient surges on 5 V USB input lines in portable chargers and OTG accessories. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy above 9.1 V threshold. Use Value: Prevents damage to downstream LDOs and USB interface ICs while maintaining <0.5 µA quiescent drain.	Use Scenario: Provides stable 9.1 V reference for comparator-based cell voltage detection in multi-cell battery packs. IC Role / Device Role / Timing Role: Precision voltage reference source with +3.8 mV/°C TC for temperature-compensated cutoff logic. Use Value: Enables accurate end-of-charge detection across −40°C to +85°C operating range without calibration.
Industrial Sensor Signal Conditioning	IoT Node Power Rail Stabilization
Use Scenario: Regulates excitation voltage for bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Low-noise Zener reference supplying constant current to sensor Wheatstone bridges. Use Value: 15 Ω Z_ZT minimizes output impedance variation, improving measurement repeatability within ±0.1%.	Use Scenario: Stabilizes 9 V supply for ultra-low-power microcontrollers and BLE radios in battery-powered edge devices. IC Role / Device Role / Timing Role: Shunt regulator maintaining regulated voltage during intermittent transmit bursts. Use Value: 250 mW rating supports 20 mA peak current draw without thermal runaway in sealed enclosures.

USB Power Input Protection

Li-ion Battery Voltage Monitor

Use Scenario: Clamps transient surges on 5 V USB input lines in portable chargers and OTG accessories.

IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy above 9.1 V threshold.

Use Value: Prevents damage to downstream LDOs and USB interface ICs while maintaining <0.5 µA quiescent drain.

Use Scenario: Provides stable 9.1 V reference for comparator-based cell voltage detection in multi-cell battery packs.

IC Role / Device Role / Timing Role: Precision voltage reference source with +3.8 mV/°C TC for temperature-compensated cutoff logic.

Use Value: Enables accurate end-of-charge detection across −40°C to +85°C operating range without calibration.

Industrial Sensor Signal Conditioning

IoT Node Power Rail Stabilization

Use Scenario: Regulates excitation voltage for bridge-based pressure sensors in factory automation modules.

IC Role / Device Role / Timing Role: Low-noise Zener reference supplying constant current to sensor Wheatstone bridges.

Use Value: 15 Ω Z_ZT minimizes output impedance variation, improving measurement repeatability within ±0.1%.

Use Scenario: Stabilizes 9 V supply for ultra-low-power microcontrollers and BLE radios in battery-powered edge devices.

IC Role / Device Role / Timing Role: Shunt regulator maintaining regulated voltage during intermittent transmit bursts.

Use Value: 250 mW rating supports 20 mA peak current draw without thermal runaway in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5239BS-7-F	9.1 V nominal, 30 Ω Z_ZT @ 20 mA, 150 pF capacitance, SOD-123 package	Larger footprint; higher thermal resistance (625 °C/W); less suitable for ultra-high-density layouts	Select when board space allows larger package and higher surge capability is needed.
BZX84-C9V1,115	9.1 V nominal, 15 Ω Z_ZT @ 5 mA, same SOT-23 package, but non-RoHS, legacy Nexperia part	Not Pb-free; lacks Class 3 ESD rating; not recommended for new designs targeting global compliance	Use only for legacy repair or cost-sensitive non-compliant industrial systems.

Compared with MMBZ5239BS-7-F and BZX84-C9V1,115, the BZX84C9V1ET1G offers superior ESD immunity, tighter Zener tolerance, lower dynamic impedance, and full RoHS/Pb-free compliance in the industry-standard SOT-23 footprint-making it optimal for next-generation portable and IoT designs requiring reliability and regulatory alignment.

Availability

BZX84C9V1ET1G is available at Aetrix Electronics and suitable for USB power protection, Li-ion battery monitoring, industrial sensor conditioning, IoT node stabilization, and portable device voltage reference applications requiring stable component supply and long-term manufacturability.

Supply support for BZX84C9V1ET1G 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BZX84CxxxET1G series is part of onsemi's broad portfolio of discrete Zener regulators designed specifically for compact, high-reliability voltage reference and overvoltage protection in space-constrained portable and battery-powered electronics.

FAQ

What is the Zener voltage tolerance of BZX84C9V1ET1G at 5 mA test current?

The BZX84C9V1ET1G has a specified Zener voltage range of 8.5 V to 9.6 V at I_ZT = 5 mA, corresponding to a nominal 9.1 V with ±5.5% tolerance. This tolerance is verified per the onsemi datasheet revision 10 (October 2016) and applies under standard 25°C ambient conditions with pulsed test current to minimize self-heating effects. The BZX84C9V1ET1G maintains this specification across its qualified operating temperature range.

Does BZX84C9V1ET1G have a connected pin 2, and what is its function?

No, pin 2 of the BZX84C9V1ET1G is internally unconnected (NC) and must remain floating on the PCB-no trace, pad, or ground connection is permitted. This is explicitly defined in the onsemi datasheet pinout diagram and mechanical drawings (Case 318, Style 8). The BZX84C9V1ET1G functions solely as a two-terminal device between pins 1 (anode) and 3 (cathode), and connecting pin 2 risks mechanical stress or unintended parasitic paths.

What is the maximum reverse leakage current for BZX84C9V1ET1G, and at what voltage is it specified?

The BZX84C9V1ET1G exhibits a maximum reverse leakage current of 0.5 µA at V_R = 7.0 V, as confirmed in the Electrical Characteristics table of the official onsemi datasheet. This value is measured at 25°C ambient and reflects the device's ability to maintain low standby power in always-on circuits. At lower reverse voltages (e.g., <5 V), leakage drops further-down to <0.1 µA-making the BZX84C9V1ET1G suitable for ultra-low-power battery monitoring.

Can BZX84C9V1ET1G be used in automotive applications, and what qualification does it hold?

The standard BZX84C9V1ET1G is not AEC-Q101 qualified; however, the SZBZX84C9V1ET1G variant-identical in electrical and mechanical specs but with automotive-grade traceability and PPAP documentation-is fully AEC-Q101 qualified. Engineers selecting the BZX84C9V1ET1G for automotive subsystems must specify the SZ prefix version. The BZX84C9V1ET1G itself is intended for commercial/industrial use, with the SZ variant being the only version approved for automotive under hood or cabin applications.

What is the thermal resistance (R_JA) of BZX84C9V1ET1G on FR-5 board, and how does it affect power derating?

The BZX84C9V1ET1G has a thermal resistance of 500 °C/W on FR-5 board at T_A = 25°C, meaning junction temperature rises 500°C per watt dissipated. Since its rated power is 250 mW at 25°C, derating begins linearly above that ambient: power must decrease by 2.0 mW/°C (1/500 W/°C × 1000 mW/W). For example, at 75°C ambient, max allowable power drops to 150 mW. This R_JA value is critical for thermal design validation of the BZX84C9V1ET1G in enclosed or high-temperature environments.

BZX84C9V1ET1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

BZX84C9V1ET1G FAQ

1.How can I place an order for BZX84C9V1ET1G through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C9V1ET1G 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 BZX84C9V1ET1G reliable?

The price and inventory of BZX84C9V1ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C9V1ET1G is usually 5 days.

3.What payment methods are accepted for BZX84C9V1ET1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C9V1ET1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C9V1ET1G?

BZX84C9V1ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C9V1ET1G 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 BZX84C9V1ET1G?

For technical support, including BZX84C9V1ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C9V1ET1G requirements.

6.How does Aetrix verify that BZX84C9V1ET1G is sourced from the original manufacturer or authorized distributors?

All BZX84C9V1ET1G 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 BZX84C9V1ET1G meets industry standards.

7.What is the process for return or replacement of BZX84C9V1ET1G?

All BZX84C9V1ET1G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C9V1ET1G, 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 BZX84C9V1ET1G part is unused and in its original packaging.

Return procedure for BZX84C9V1ET1G:

1.Submit a request within 90 days.

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

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