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

onsemi BZX84C3V3LT1

Name: BZX84C3V3LT1
Brand: onsemi
SKU: BZX84C3V3LT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C3V3LT1

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C3V3LT1.pdf

Description:: DIODE ZENER 3.3V 225MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,025

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Product details

Overview

BZX84C3V3LT1 from onsemi is a 3.3 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 95 Ω dynamic impedance at 5 mA test current and 5 µA maximum reverse leakage at 1 V reverse voltage - used for precision voltage reference and overvoltage protection in compact portable electronics.

For engineers reviewing the BZX84C3V3LT1 datasheet, pinout, applications, or equivalent options, key selection considerations include its 3.3 V nominal Zener voltage, tight thermal coefficient (−3.5 mV/°C), Pb-free SOT-23 footprint, ESD rating >16 kV (HBM), and compatibility with high-density PCB assembly processes.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp or regulate voltage at 3.3 V with specified tolerance and temperature drift. Its SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), enabling unidirectional regulation without series current-limiting resistor integration.

The BZX84C3V3LT1 exhibits a nominal temperature coefficient of −3.5 mV/°C, indicating decreasing Zener voltage with rising junction temperature - critical for stability in battery-powered devices operating across −65°C to +150°C ambient range. Its 450 pF capacitance at 0 V bias supports low-frequency filtering but limits high-speed transient suppression use.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.1–3.5 V @ 5 mA - defines stable regulation window for 3.3 V rail clamping
Power Dissipation	225 mW on FR-5 board @ 25°C - sets max continuous current limit (~68 mA at 3.3 V)
Zener Impedance (Z_ZT)	95 Ω @ 5 mA - determines output voltage deviation under load current changes
Reverse Leakage (I_R)	5 µA @ 1 V - ensures minimal quiescent current draw in standby mode
ESD Rating	Class 3 (>16 kV HBM) - enables direct handling in portable assembly without extra protection
Junction Temp Range	−65°C to +150°C - supports operation in automotive cabin and industrial edge environments
Capacitance	450 pF @ 0 V, 1 MHz - impacts high-frequency noise coupling in signal path applications

Pinout & Package

SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting body with corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode indicated by band. Maximum soldering temperature: 260°C for 10 seconds.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node; reverse-biased during regulation
2	No Connection	Internally isolated; must remain unconnected on PCB
3	Cathode	Connected to regulated voltage node; polarity band identifies this terminal

Key Features

Feature	Design Value
Pb-Free Construction	RoHS-compliant SOT-23 package with G-suffix availability - meets global environmental compliance requirements
Tight Tolerance Option	±5% V_Z tolerance (C-series) - enables accurate voltage setting without post-calibration
High-Density Mounting	Small outline (2.8 × 1.2 × 1.0 mm) - fits 0.65 mm pitch layouts in smartphones and wearables
Automated Assembly Optimized	Transfer-molded case with solderable finish - compatible with reflow and wave soldering per J-STD-020
Robust ESD Protection	Class 3 HBM (>16 kV) - eliminates need for external ESD diodes in I/O line protection

Applications

Portable Power Rail Clamping	Microcontroller I/O Protection
Use Scenario: Protects 3.3 V supply rail in Bluetooth earbuds against battery overvoltage during charging cycles. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping excess voltage before it reaches PMIC inputs. Use Value: Prevents latch-up or damage to downstream LDOs and RF transceivers with no active control required.	Use Scenario: Shields GPIO pins of ARM Cortex-M0+ MCU from ESD events during button press or connector insertion. IC Role / Device Role / Timing Role: Fast-acting voltage clamp diverting transient energy to ground via cathode connection. Use Value: Leverages 16 kV HBM rating and low leakage to avoid signal distortion while meeting IEC 61000-4-2 Level 4.
Reference Voltage Source	Low-Power Sensor Biasing
Use Scenario: Provides stable 3.3 V reference for 12-bit ADC in handheld multimeter during battery discharge. IC Role / Device Role / Timing Role: Passive voltage reference with predictable TC (−3.5 mV/°C) for offset compensation. Use Value: Enables <1% full-scale error over 0–50°C without calibration, reducing firmware complexity.	Use Scenario: Biases analog output stage of MEMS accelerometer in fitness tracker using minimal quiescent current. IC Role / Device Role / Timing Role: Low-leakage (5 µA @ 1 V) Zener supplying bias current to op-amp input stage. Use Value: Extends coin-cell battery life beyond 12 months while maintaining ±10 mV reference stability.

Portable Power Rail Clamping

Microcontroller I/O Protection

Use Scenario: Protects 3.3 V supply rail in Bluetooth earbuds against battery overvoltage during charging cycles.

IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping excess voltage before it reaches PMIC inputs.

Use Value: Prevents latch-up or damage to downstream LDOs and RF transceivers with no active control required.

Use Scenario: Shields GPIO pins of ARM Cortex-M0+ MCU from ESD events during button press or connector insertion.

IC Role / Device Role / Timing Role: Fast-acting voltage clamp diverting transient energy to ground via cathode connection.

Use Value: Leverages 16 kV HBM rating and low leakage to avoid signal distortion while meeting IEC 61000-4-2 Level 4.

Reference Voltage Source

Low-Power Sensor Biasing

Use Scenario: Provides stable 3.3 V reference for 12-bit ADC in handheld multimeter during battery discharge.

IC Role / Device Role / Timing Role: Passive voltage reference with predictable TC (−3.5 mV/°C) for offset compensation.

Use Value: Enables <1% full-scale error over 0–50°C without calibration, reducing firmware complexity.

Use Scenario: Biases analog output stage of MEMS accelerometer in fitness tracker using minimal quiescent current.

IC Role / Device Role / Timing Role: Low-leakage (5 µA @ 1 V) Zener supplying bias current to op-amp input stage.

Use Value: Extends coin-cell battery life beyond 12 months while maintaining ±10 mV reference stability.

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, ±5%, 300 mW on FR-4, 30 Ω Z_ZT @ 20 mA - higher power, lower impedance	Preferred where higher surge current handling or tighter regulation under varying load is needed	Select when board layout allows larger SOT-23 variant and thermal margin exceeds 225 mW
BZX84-C3V3-7-F	3.3 V, ±5%, 250 mW, same SOT-23, 100 Ω Z_ZT @ 5 mA - slightly higher impedance, different marking	Drop-in replacement in legacy designs using Diodes Inc. sourcing channels	Choose for multi-source procurement strategy where onsemi and Diodes Inc. part numbers coexist in BOM

Compared with BZX84C3V3LT1, MMBZ5226BS-7-F offers better dynamic regulation at higher currents but requires thermal reassessment; BZX84-C3V3-7-F provides identical electrical behavior with alternate logistics packaging - both require validation of cathode/anode orientation and no-connection pin handling.

Availability

BZX84C3V3LT1 is available at Aetrix Electronics and suitable for portable power rail clamping, microcontroller I/O protection, reference voltage sourcing, low-power sensor biasing, and ESD-hardened interface design requiring stable component supply across production volumes.

Supply support for BZX84C3V3LT1 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The BZX84C3V3LT1 belongs to the BZX84CxxxLT1 series of standard-tolerance Zener diodes designed specifically for space-constrained, cost-sensitive voltage regulation in consumer portables and high-density PCBs.

FAQ

What is the Zener voltage tolerance for BZX84C3V3LT1?

The BZX84C3V3LT1 has a nominal Zener voltage of 3.3 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 3.1 V and 3.5 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet and applies strictly to the C-series (standard tolerance) variant of the BZX84 family.

Does BZX84C3V3LT1 have a functional pin 2?

No, pin 2 of the BZX84C3V3LT1 is internally not connected and must remain unattached on the PCB. The device uses only pins 1 (anode) and 3 (cathode) for operation, as explicitly stated in the Pinout section on page 7 of the datasheet and confirmed in the Electrical Characteristics tables.

What is the maximum reverse leakage current for BZX84C3V3LT1?

The BZX84C3V3LT1 specifies a maximum reverse leakage current (I_R) of 5 µA at 1 V reverse voltage and 25°C ambient temperature. This value is listed in the Electrical Characteristics table for the BZX84C3V3LT1 row and reflects worst-case off-state current under light bias conditions.

Can BZX84C3V3LT1 be used in place of BZX84C3V3LT3?

Yes, BZX84C3V3LT1 and BZX84C3V3LT3 share identical electrical and thermal specifications - the "T1" and "T3" suffixes denote tape-and-reel packaging (3,000 vs. 10,000 units per reel), not functional differences. Both use the same SOT-23 package, pinout, and Zener characteristics per the Ordering Information table on page 2.

Is BZX84C3V3LT1 RoHS compliant?

Yes, BZX84C3V3LT1 is RoHS compliant when ordered with the "G" suffix (e.g., BZX84C3V3LT1G), indicating Pb-free construction. The base part number BZX84C3V3LT1 may be supplied in either standard or Pb-free form depending on manufacturing lot; Aetrix Electronics guarantees only the G-suffix version meets current RoHS Directive 2011/65/EU requirements.

BZX84C3V3LT1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: BZX84CxxxLT1

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)

BZX84C3V3LT1 FAQ

1.How can I place an order for BZX84C3V3LT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C3V3LT1 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 BZX84C3V3LT1 reliable?

The price and inventory of BZX84C3V3LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V3LT1 is usually 5 days.

3.What payment methods are accepted for BZX84C3V3LT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V3LT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C3V3LT1?

BZX84C3V3LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C3V3LT1 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 BZX84C3V3LT1?

For technical support, including BZX84C3V3LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V3LT1 requirements.

6.How does Aetrix verify that BZX84C3V3LT1 is sourced from the original manufacturer or authorized distributors?

All BZX84C3V3LT1 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 BZX84C3V3LT1 meets industry standards.

7.What is the process for return or replacement of BZX84C3V3LT1?

All BZX84C3V3LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V3LT1, 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 BZX84C3V3LT1 part is unused and in its original packaging.

Return procedure for BZX84C3V3LT1:

1.Submit a request within 90 days.

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

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