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

onsemi BZX84C3V3LT3G

Name: BZX84C3V3LT3G
Brand: onsemi
SKU: BZX84C3V3LT3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C3V3LT3G

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C3V3LT3G.pdf

Description:: DIODE ZENER 3.3V 250MW SOT23-3

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Product details

Overview

BZX84C3V3LT3G from onsemi is a 3.3 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 95 Ω dynamic impedance at 5 mA test current and −3.5 mV/°C temperature coefficient - used for precision low-voltage reference and overvoltage protection in portable power rails.

For engineers reviewing the BZX84C3V3LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient stability, leakage current ≤5 µA at 1 V reverse bias, and compatibility with automated SMT assembly on high-density PCBs.

Technical Context

This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a silicon p-n junction. Its Zener voltage is specified at three test currents (1 mA, 5 mA, 20 mA), enabling stable regulation across varying load conditions while maintaining tight thermal drift control via its negative temperature coefficient.

The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports surface-mount reflow profiles up to 260°C for 10 seconds. It delivers ESD robustness >16 kV per Human Body Model and complies with RoHS and Pb-free requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.3 V nominal, 3.1–3.5 V range at 5 mA - ensures stable 3.3 V rail clamping under typical bias conditions
Power Dissipation	250 mW on FR-5 board at 25°C - defines maximum continuous power handling before thermal derating begins
Zener Impedance (Z_ZT)	95 Ω max at 5 mA - determines output voltage variation under changing load current
Reverse Leakage Current	≤5 µA at V_R = 1 V - limits quiescent current draw in standby or low-power monitoring circuits
Temperature Coefficient	−3.5 mV/°C at 5 mA - quantifies voltage drift with ambient temperature changes, critical for precision references
Capacitance	450 pF at V_R = 0 V, f = 1 MHz - impacts high-frequency noise filtering and transient response in bypass applications
ESD Rating	Class 3 (>16 kV HBM) - enables direct integration into handheld and exposed I/O interfaces without external protection

Pinout & Package

SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; UL 94 V-0 flammability rating.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Connected to lower-potential side of regulated node; reverse-biased during Zener operation
Pin 2	No Connection	Internally unconnected; must remain floating - no PCB trace or pad required
Pin 3	Cathode	Connected to higher-potential side (e.g., V_CC); carries full Zener current during regulation

Key Features

Feature	Design Value
250 mW power rating on FR-5 board	Enables use in space-constrained consumer and portable designs without forced cooling
Tight Zener voltage tolerance (±5%)	Supports accurate 3.3 V reference generation for ADCs, comparators, and LDO feedback networks
ESD robustness >16 kV HBM	Reduces need for external TVS devices in battery-powered interface circuits
Pb-free and RoHS-compliant construction	Meets global environmental compliance mandates for industrial and automotive supply chains
Optimized for automated SMT assembly	Ensures high first-pass yield in high-volume production using standard pick-and-place equipment

Applications

USB Power Monitoring	Microcontroller Reset Circuit
Use Scenario: Monitoring 5 V USB input to detect undervoltage conditions before system boot. IC Role / Device Role / Timing Role: Zener diode provides fixed 3.3 V reference to comparator input, triggering reset when V_IN drops below threshold. Use Value: Enables reliable brown-out detection with <5 µA leakage, minimizing standby current drain.	Use Scenario: Generating a clean, temperature-stable reset signal for an ARM Cortex-M0 microcontroller. IC Role / Device Role / Timing Role: BZX84C3V3LT3G sets precise 3.3 V trip point for external reset supervisor IC or RC-based reset generator. Use Value: −3.5 mV/°C tempco ensures reset threshold remains within ±2% over −40°C to +85°C operating range.
Low-Voltage Sensor Biasing	LED Current Regulation
Use Scenario: Providing stable bias voltage to analog sensor ICs (e.g., temperature or pressure transducers) operating from 3.3 V rails. IC Role / Device Role / Timing Role: Functions as shunt reference to maintain constant voltage across sensor excitation circuitry. Use Value: 95 Ω Zener impedance ensures <10 mV output variation across 0–1 mA load current swing.	Use Scenario: Regulating current through indicator LEDs in battery-powered instrumentation panels. IC Role / Device Role / Timing Role: Used in series with LED and current-limiting resistor to clamp forward voltage and stabilize current. Use Value: 3.3 V Zener voltage allows predictable current setting with minimal parts count and <5 µA dark-current error.

USB Power Monitoring

Microcontroller Reset Circuit

Use Scenario: Monitoring 5 V USB input to detect undervoltage conditions before system boot.

IC Role / Device Role / Timing Role: Zener diode provides fixed 3.3 V reference to comparator input, triggering reset when V_IN drops below threshold.

Use Value: Enables reliable brown-out detection with <5 µA leakage, minimizing standby current drain.

Use Scenario: Generating a clean, temperature-stable reset signal for an ARM Cortex-M0 microcontroller.

IC Role / Device Role / Timing Role: BZX84C3V3LT3G sets precise 3.3 V trip point for external reset supervisor IC or RC-based reset generator.

Use Value: −3.5 mV/°C tempco ensures reset threshold remains within ±2% over −40°C to +85°C operating range.

Low-Voltage Sensor Biasing

LED Current Regulation

Use Scenario: Providing stable bias voltage to analog sensor ICs (e.g., temperature or pressure transducers) operating from 3.3 V rails.

IC Role / Device Role / Timing Role: Functions as shunt reference to maintain constant voltage across sensor excitation circuitry.

Use Value: 95 Ω Zener impedance ensures <10 mV output variation across 0–1 mA load current swing.

Use Scenario: Regulating current through indicator LEDs in battery-powered instrumentation panels.

IC Role / Device Role / Timing Role: Used in series with LED and current-limiting resistor to clamp forward voltage and stabilize current.

Use Value: 3.3 V Zener voltage allows predictable current setting with minimal parts count and <5 µA dark-current error.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C3V3LT1G	Same electrical specs but supplied in 3,000-piece tape-and-reel vs. 10,000-piece for BZX84C3V3LT3G	Preferred for prototyping or low-volume production where smaller reels reduce inventory overhead	Select BZX84C3V3LT1G when reel size constraints or evaluation quantities drive procurement
BZX84B3V3LT1G	Tighter ±2.1% tolerance (3.23–3.37 V) and same 95 Ω Z_ZT, but higher cost and lower volume availability	Suitable where absolute voltage accuracy dominates over cost or supply chain flexibility	Choose BZX84B3V3LT1G only when design requires sub-2% Zener tolerance at 5 mA

Compared with BZX84C3V3LT3G, the LT1G variant offers identical performance in a smaller reel format ideal for R&D, while the BZX84B3V3LT1G delivers tighter voltage control at the expense of cost and sourcing scalability - making BZX84C3V3LT3G optimal for high-volume, cost-sensitive 3.3 V reference applications.

Availability

BZX84C3V3LT3G is available at Aetrix Electronics and suitable for USB power supervision, microcontroller reset circuits, low-voltage sensor biasing, and LED current regulation requiring stable component supply and long-term manufacturability.

Supply support for BZX84C3V3LT3G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The BZX84CxxxLTxG series is part of onsemi's broad portfolio of discrete Zener regulators designed specifically for compact, high-density power management in portable and battery-operated electronics.

FAQ

What is the Zener voltage tolerance of BZX84C3V3LT3G?

The BZX84C3V3LT3G has a nominal Zener voltage of 3.3 V with a tolerance of ±5%, meaning the actual measured voltage falls between 3.1 V and 3.5 V when tested at 5 mA (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet, and applies across the full operating temperature range of −65°C to +150°C.

Does BZX84C3V3LT3G have a no-connect pin, and how should it be handled on the PCB?

Yes, BZX84C3V3LT3G has Pin 2 designated as "No Connection" per the mechanical outline (Style 8) and datasheet pinout. This terminal is internally unconnected and must remain electrically floating - no PCB trace, solder mask opening, or thermal pad should be assigned to it. Leaving Pin 2 unconnected avoids unintended parasitic coupling or solder bridging risks during reflow.

What is the maximum power dissipation of BZX84C3V3LT3G on an FR-5 board?

The BZX84C3V3LT3G is rated for 250 mW total power dissipation on an FR-5 board at 25°C ambient temperature. Above 25°C, it derates linearly at 2.0 mW/°C, reaching zero dissipation capability at 150°C junction temperature. This rating assumes standard JEDEC-defined board layout conditions and is validated per onsemi's Maximum Ratings table on page 2 of the datasheet.

Can BZX84C3V3LT3G be used in automotive applications?

The standard BZX84C3V3LT3G is not AEC-Q101 qualified. However, the SZBZX84C3V3LT3G variant - which shares identical electrical and mechanical specifications - is explicitly qualified for automotive applications and supports PPAP documentation. For automotive-grade deployment, engineers must specify the SZ-prefix version, as the base BZX84C3V3LT3G lacks the required stress testing and process controls.

What is the reverse leakage current specification for BZX84C3V3LT3G at 1 V reverse bias?

The BZX84C3V3LT3G exhibits a maximum reverse leakage current (I_R) of 5 µA when subjected to 1 V reverse bias (V_R = 1 V) at 25°C, as specified in the Electrical Characteristics table on page 3 of the onsemi datasheet. This low leakage supports ultra-low-power operation in battery-backed monitoring and always-on sensor circuits.

BZX84C3V3LT3G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: BZX84CxxxLT1G

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:: 250 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)

BZX84C3V3LT3G FAQ

1.How can I place an order for BZX84C3V3LT3G through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C3V3LT3G 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 BZX84C3V3LT3G reliable?

The price and inventory of BZX84C3V3LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V3LT3G is usually 5 days.

3.What payment methods are accepted for BZX84C3V3LT3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V3LT3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C3V3LT3G?

BZX84C3V3LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C3V3LT3G 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 BZX84C3V3LT3G?

For technical support, including BZX84C3V3LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V3LT3G requirements.

6.How does Aetrix verify that BZX84C3V3LT3G is sourced from the original manufacturer or authorized distributors?

All BZX84C3V3LT3G 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 BZX84C3V3LT3G meets industry standards.

7.What is the process for return or replacement of BZX84C3V3LT3G?

All BZX84C3V3LT3G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V3LT3G, 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 BZX84C3V3LT3G part is unused and in its original packaging.

Return procedure for BZX84C3V3LT3G:

1.Submit a request within 90 days.

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

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