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

onsemi BZX84C3V3ET3G

Name: BZX84C3V3ET3G
Brand: onsemi
SKU: BZX84C3V3ET3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C3V3ET3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C3V3ET3G.pdf

Description:: DIODE ZENER 3.3V 225MW SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:5,440

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Product details

Overview

BZX84C3V3ET3G from onsemi is a 3.3 V, 250 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and low-power reference applications. It delivers nominal Zener voltage of 3.3 V at 5 mA test current, with dynamic impedance ≤95 Ω, reverse leakage ≤5 µA at 1 V, and ESD rating >16 kV (HBM). It is widely used in voltage clamping, overvoltage protection, and biasing circuits in portable electronics.

For engineers reviewing the BZX84C3V3ET3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±0.2 V), thermal coefficient (−3.5 mV/°C), capacitance (450 pF at 0 V), and SOT-23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals. Its Zener mechanism dominates conduction below ~5 V, resulting in predictable temperature behavior and low dynamic impedance under specified test conditions.

The SOT-23 package supports automated placement and reflow soldering, with cathode identified by a band on terminal 3. Pin 2 is internally unconnected - a structural feature confirmed in the mechanical outline (Style 8) and electrical characteristics table.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.3 V nominal at I_ZT = 5 mA; ensures stable reference within ±0.2 V tolerance for low-voltage rail monitoring
Power Dissipation	250 mW on FR-5 board; defines maximum continuous power handling without derating at 25°C ambient
Zener Impedance (Z_ZT)	≤95 Ω at 5 mA; determines output voltage variation under load current changes
Reverse Leakage (I_R)	≤5 µA at V_R = 1 V; limits standby current in clamping or reference configurations
Capacitance (C)	450 pF at V_R = 0 V, f = 1 MHz; impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits
Temperature Coefficient	−3.5 mV/°C at 5 mA; quantifies voltage drift with ambient temperature change in precision references
ESD Rating	Class 3 (>16 kV HBM); enables robust handling in manual assembly and end-user environments

Pinout & Package

SOT-23 (TO-236) 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 marked by band; maximum soldering temperature 260°C for 10 seconds.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Forward-biased terminal; connects to lower-potential node in regulation path
2	No Connection	Internally unconnected; no electrical function - must remain floating in layout
3	Cathode	Reverse-biased terminal; connects to regulated output or clamping node

Key Features

Feature	Design Value
Pb-Free & RoHS compliant	Meets global environmental regulations without compromising solderability or reliability
UL 94 V-0 flammability rating	Ensures flame resistance in safety-critical consumer and industrial enclosures
Optimized for automated assembly	Package geometry and marking support high-speed pick-and-place and AOI inspection
High-density footprint	SOT-23 size enables placement in space-constrained designs such as wearables and IoT sensors
Stable low-voltage reference	3.3 V Zener point aligns with common logic supply rails for direct interface with microcontrollers

Applications

Smartphone Power Management	USB-C Port Protection
Use Scenario: Regulating auxiliary bias voltage for PMIC monitoring circuitry in battery-powered smartphones. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 3.3 V reference for ADC input scaling and fault detection thresholds. Use Value: Enables accurate battery voltage measurement and charge-state estimation within ±1% error margin under varying load and temperature.	Use Scenario: Clamping transient overvoltage on USB-C CC lines during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional transient suppressor limiting line voltage to safe levels (<3.6 V) before reaching USB controller pins. Use Value: Prevents latch-up and permanent damage to USB-C PHY ICs during ESD or inductive coupling events.
Industrial Sensor Signal Conditioning	Medical Wearable Reference
Use Scenario: Providing excitation voltage and reference for bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Low-drift voltage reference source for Wheatstone bridge bias and ratiometric ADC reference. Use Value: Maintains sensor accuracy to ±0.5% FS over −40°C to +85°C due to matched thermal coefficient with bridge elements.	Use Scenario: Generating stable 3.3 V reference for analog front-end of ECG electrode amplifiers in patch-style monitors. IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage clamp stabilizing amplifier bias nodes against RF interference. Use Value: Reduces baseline wander and improves SNR by suppressing 50/60 Hz mains coupling and cellular band noise.

Smartphone Power Management

USB-C Port Protection

Use Scenario: Regulating auxiliary bias voltage for PMIC monitoring circuitry in battery-powered smartphones.

IC Role / Device Role / Timing Role: Zener voltage reference providing stable 3.3 V reference for ADC input scaling and fault detection thresholds.

Use Value: Enables accurate battery voltage measurement and charge-state estimation within ±1% error margin under varying load and temperature.

Use Scenario: Clamping transient overvoltage on USB-C CC lines during hot-plug events.

IC Role / Device Role / Timing Role: Bidirectional transient suppressor limiting line voltage to safe levels (<3.6 V) before reaching USB controller pins.

Use Value: Prevents latch-up and permanent damage to USB-C PHY ICs during ESD or inductive coupling events.

Industrial Sensor Signal Conditioning

Medical Wearable Reference

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

IC Role / Device Role / Timing Role: Low-drift voltage reference source for Wheatstone bridge bias and ratiometric ADC reference.

Use Value: Maintains sensor accuracy to ±0.5% FS over −40°C to +85°C due to matched thermal coefficient with bridge elements.

Use Scenario: Generating stable 3.3 V reference for analog front-end of ECG electrode amplifiers in patch-style monitors.

IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage clamp stabilizing amplifier bias nodes against RF interference.

Use Value: Reduces baseline wander and improves SNR by suppressing 50/60 Hz mains coupling and cellular band noise.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5226BS-7-F	3.3 V nominal, 350 mW rating, SOT-23, Z_ZT ≤ 30 Ω at 20 mA	Higher power and lower impedance suit higher-current reference needs but require thermal reassessment	Select when >20 mA Zener current or tighter regulation under load is required
BZX84-C3V3-7-F	3.3 V nominal, 300 mW rating, SOT-23, Z_ZT ≤ 95 Ω at 5 mA, same pinout	Higher power rating allows extended operation at elevated ambient temperatures	Choose for improved thermal margin in enclosed or high-temperature industrial housings

Compared with BZX84C3V3ET3G, MMBZ5226BS-7-F offers lower impedance at higher test current but requires validation of PCB copper area for thermal dissipation; BZX84-C3V3-7-F provides identical electrical behavior with enhanced power headroom, making it suitable for legacy-compatible upgrades without layout change.

Availability

BZX84C3V3ET3G is available at Aetrix Electronics and suitable for smartphone power management, USB-C port protection, and industrial sensor signal conditioning requiring stable component supply and full traceability.

Supply support for BZX84C3V3ET3G 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 BZX84CxxxET3G series belongs to onsemi's precision Zener regulator product line, engineered specifically for compact, high-reliability voltage reference and clamping in space- and power-constrained portable and embedded systems.

FAQ

What is the exact Zener voltage tolerance of BZX84C3V3ET3G at 5 mA?

The BZX84C3V3ET3G has a guaranteed Zener voltage range of 3.1 V to 3.5 V at I_ZT = 5 mA, per the Electrical Characteristics table on page 2 of the official onsemi datasheet. This ±0.2 V tolerance reflects manufacturing spread and ensures predictable performance in 3.3 V rail monitoring and clamping applications where tight voltage control is essential.

Is pin 2 of BZX84C3V3ET3G electrically connected internally?

No, pin 2 of BZX84C3V3ET3G is explicitly designated as "No Connection" in the datasheet's pinout diagram (Style 8) and mechanical outline. It serves only as a structural lead and must remain unconnected in PCB layout and schematic symbol - bridging or routing to this pin may cause assembly defects or functional failure.

Can BZX84C3V3ET3G be used as a substitute for a 3.3 V linear regulator?

No - the BZX84C3V3ET3G is a two-terminal Zener diode, not a three-terminal regulator. It lacks current-limiting capability and requires an external series resistor to set operating current. While it provides voltage reference or clamping, it cannot deliver regulated output current like an LDO; using it without proper current limiting risks thermal runaway or device failure.

What is the maximum reverse leakage current for BZX84C3V3ET3G at 1 V?

The maximum reverse leakage current for BZX84C3V3ET3G is 5 µA at V_R = 1 V, as specified in the Electrical Characteristics table. This value defines worst-case standby current draw in clamping configurations and directly impacts battery life in always-on wearable or sensor applications.

Does BZX84C3V3ET3G meet AEC-Q101 qualification?

No - only the SZ-prefix variants (e.g., SZBZX84C3V3ET3G) are AEC-Q101 qualified and PPAP capable. The BZX84C3V3ET3G is intended for commercial and industrial applications; for automotive use, the SZ version must be selected to ensure compliance with stress testing and traceability requirements.

BZX84C3V3ET3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 3.3 V

Tolerance:: ±6%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 95 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:: -

Qualification:: -

Mounting Type:: Surface Mount

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

BZX84C3V3ET3G FAQ

1.How can I place an order for BZX84C3V3ET3G through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C3V3ET3G 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 BZX84C3V3ET3G reliable?

The price and inventory of BZX84C3V3ET3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V3ET3G is usually 5 days.

3.What payment methods are accepted for BZX84C3V3ET3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V3ET3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C3V3ET3G?

BZX84C3V3ET3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C3V3ET3G 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 BZX84C3V3ET3G?

For technical support, including BZX84C3V3ET3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V3ET3G requirements.

6.How does Aetrix verify that BZX84C3V3ET3G is sourced from the original manufacturer or authorized distributors?

All BZX84C3V3ET3G 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 BZX84C3V3ET3G meets industry standards.

7.What is the process for return or replacement of BZX84C3V3ET3G?

All BZX84C3V3ET3G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V3ET3G, 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 BZX84C3V3ET3G part is unused and in its original packaging.

Return procedure for BZX84C3V3ET3G:

1.Submit a request within 90 days.

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

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