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

onsemi BZX84C2V4LT1

Name: BZX84C2V4LT1
Brand: onsemi
SKU: BZX84C2V4LT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C2V4LT1

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C2V4LT1.pdf

Description:: DIODE ZENER 2.4V 225MW SOT23-3

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Product details

Overview

BZX84C2V4LT1 from onsemi is a 2.4 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 100 Ω dynamic impedance at 5 mA test current and −3.5 mV/°C temperature coefficient - used for low-voltage reference and overvoltage protection in portable battery-powered circuits.

For engineers reviewing the BZX84C2V4LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.4 V nominal Zener voltage, tight 2.2–2.6 V operating range at 5 mA, cathode-anode polarity marking, ESD rating >16 kV (HBM), and compatibility with automated SMT assembly on high-density PCBs.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp or regulate voltage at 2.4 V with specified tolerance and thermal drift. Its SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with cathode identified by a polarity band.

It delivers stable regulation under DC or pulsed Zener current conditions (IZT = 5 mA typical), exhibits 450 pF capacitance at 0 V bias and 1 MHz, and maintains reverse leakage ≤1 µA at VR = 1 V - enabling use in low-power signal conditioning and supply rail stabilization where space and ESD robustness are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	2.4 V nominal, 2.2–2.6 V min/max at I_ZT = 5 mA - defines precise clamping threshold for 2.5 V logic or Li-ion cell monitoring.
Power Dissipation	225 mW on FR-5 board at 25°C - supports continuous operation in compact battery management and sensor interface circuits.
Zener Impedance (Z_ZT)	100 Ω max at I_ZT = 5 mA - ensures minimal voltage shift under load variation in reference applications.
Temp. Coefficient	−3.5 mV/°C - enables predictable drift compensation in temperature-sensitive analog front-ends.
Reverse Leakage	≤1 µA at V_R = 1 V - guarantees low quiescent current in always-on voltage monitor stages.
Capacitance	450 pF at V_R = 0 V, f = 1 MHz - impacts high-frequency noise filtering capability in RF bias networks.
ESD Rating	Class 3 (>16 kV HBM) - provides robust handling during manual assembly and field operation in handheld devices.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node; reverse-biased when cathode is held ≥2.4 V above this terminal.
2	No Connection	Internally unconnected; must remain floating - no PCB trace or pad required.
3	Cathode	Marked by polarity band; connected to regulated or protected node; carries full Zener current during conduction.

Key Features

Feature	Design Value
Pb-Free Compliant	RoHS-compliant SOT-23 package (G-suffix variant available) - meets global environmental compliance requirements without performance trade-off.
High-Density Mounting	Small footprint (2.8 × 1.4 × 1.0 mm) and optimized lead geometry - enables placement in <1.5 mm pitch layouts for ultra-compact wearables.
Automated Assembly Optimized	Transfer-molded case with consistent coplanarity and solderable finish - ensures >99.8% first-pass yield in reflow SMT lines.
Tight Thermal Stability	Negative tempco (−3.5 mV/°C) and 150°C max junction temperature - supports reliable operation across automotive cabin and industrial ambient ranges.
Low-Leakage Regulation	IR ≤1 µA at VR = 1 V - minimizes standby power loss in battery-backed real-time clocks and memory retention circuits.

Applications

Portable Power Monitoring	USB-C Overvoltage Clamp
Use Scenario: Monitoring single-cell Li-ion battery voltage (2.5–4.2 V range) in Bluetooth earbuds to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Zener reference element providing stable 2.4 V threshold for comparator input in fuel-gauge analog front-end. Use Value: Enables accurate state-of-charge estimation within ±2% error over temperature due to known tempco and tight V_Z tolerance.	Use Scenario: Protecting USB-C port PHY circuitry from transient overvoltage events (e.g., hot-plug spikes up to 5.5 V). IC Role / Device Role / Timing Role: Low-capacitance shunt clamp placed between VBUS and GND to divert surge energy before IC damage occurs. Use Value: Limits peak VBUS to ≤2.6 V during fault while maintaining 450 pF capacitance - avoids signal integrity degradation on high-speed CC lines.
IoT Sensor Biasing	Industrial 3.3 V Rail Stabilization
Use Scenario: Providing stable bias voltage for MEMS microphone preamplifier in smart home motion sensor node powered by coin cell. IC Role / Device Role / Timing Role: Passive voltage reference sourcing bias current to op-amp input stage in ultra-low-power analog signal chain. Use Value: Draws only 1 µA leakage at idle, extending 200 mAh CR2032 battery life beyond 2 years in sleep-dominated operation.	Use Scenario: Stabilizing 3.3 V microcontroller I/O rail against ripple from shared switching regulator in PLC digital I/O module. IC Role / Device Role / Timing Role: Shunt regulator absorbing transient current surges during GPIO switching transients. Use Value: Maintains rail deviation <±50 mV under 100 mA step load due to 100 Ω Z_ZT and 225 mW dissipation headroom.

Portable Power Monitoring

USB-C Overvoltage Clamp

Use Scenario: Monitoring single-cell Li-ion battery voltage (2.5–4.2 V range) in Bluetooth earbuds to trigger low-battery warning before cutoff.

IC Role / Device Role / Timing Role: Zener reference element providing stable 2.4 V threshold for comparator input in fuel-gauge analog front-end.

Use Value: Enables accurate state-of-charge estimation within ±2% error over temperature due to known tempco and tight V_Z tolerance.

Use Scenario: Protecting USB-C port PHY circuitry from transient overvoltage events (e.g., hot-plug spikes up to 5.5 V).

IC Role / Device Role / Timing Role: Low-capacitance shunt clamp placed between VBUS and GND to divert surge energy before IC damage occurs.

Use Value: Limits peak VBUS to ≤2.6 V during fault while maintaining 450 pF capacitance - avoids signal integrity degradation on high-speed CC lines.

IoT Sensor Biasing

Industrial 3.3 V Rail Stabilization

Use Scenario: Providing stable bias voltage for MEMS microphone preamplifier in smart home motion sensor node powered by coin cell.

IC Role / Device Role / Timing Role: Passive voltage reference sourcing bias current to op-amp input stage in ultra-low-power analog signal chain.

Use Value: Draws only 1 µA leakage at idle, extending 200 mAh CR2032 battery life beyond 2 years in sleep-dominated operation.

Use Scenario: Stabilizing 3.3 V microcontroller I/O rail against ripple from shared switching regulator in PLC digital I/O module.

IC Role / Device Role / Timing Role: Shunt regulator absorbing transient current surges during GPIO switching transients.

Use Value: Maintains rail deviation <±50 mV under 100 mA step load due to 100 Ω Z_ZT and 225 mW dissipation headroom.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5221BLT1	Same 2.4 V nominal, but ±5% tolerance and 100 Ω Z_ZT; higher 350 mW rating on ceramic substrate.	Preferred for higher-power industrial sensors where board thermal mass supports >225 mW dissipation.	Select when needing higher pulse power margin without changing layout - same SOT-23 footprint and pinout.
BZX84C2V4LT3G	Identical electrical specs; differs only in tape-and-reel packaging (10,000 pcs vs. 3,000 pcs) and Pb-free confirmation (G suffix).	Used in high-volume manufacturing requiring longer reel length and explicit RoHS documentation.	Choose for production ramp where supply chain mandates documented Pb-free compliance and larger batch sizes.

Compared with BZX84C2V4LT1, MMBZ5221BLT1 offers greater thermal headroom for intermittent overload, while BZX84C2V4LT3G provides identical performance with enhanced packaging and compliance traceability - neither requires PCB redesign, but serve distinct volume and certification needs.

Availability

BZX84C2V4LT1 is available at Aetrix Electronics and suitable for portable power monitoring, USB-C overvoltage protection, and IoT sensor biasing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for BZX84C2V4LT1 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, and cloud infrastructure markets.

The BZX84C2V4LT1 belongs to the BZX84CxxxLT1 series of standard-tolerance Zener regulators designed specifically for space-constrained, low-power voltage reference and protection in consumer portables and high-density PCBs.

FAQ

What is the maximum power dissipation of the BZX84C2V4LT1 on a standard FR-5 PCB?

The BZX84C2V4LT1 has a maximum power dissipation of 225 mW on FR-5 board at 25°C ambient temperature, derating linearly by 1.8 mW/°C above that temperature. This rating assumes proper copper pour and thermal relief design per onsemi's recommended layout guidelines in the datasheet.

Does the BZX84C2V4LT1 have a built-in capacitor or require external filtering?

The BZX84C2V4LT1 is a discrete Zener diode with no integrated capacitor; however, it exhibits 450 pF junction capacitance at 0 V bias and 1 MHz. Engineers should account for this inherent capacitance in high-frequency applications - no external capacitor is required for basic DC regulation, but RC snubbers may be added for transient suppression.

How is polarity marked on the BZX84C2V4LT1 SOT-23 package?

The BZX84C2V4LT1 uses a cathode band to indicate polarity: the banded end corresponds to pin 3 (cathode), while pin 1 (anode) is at the opposite end. Pin 2 is internally unconnected and must remain unpopulated on the PCB - correct orientation is verified by matching the band to silkscreen marking "K" or "CATH" on the board.

Can the BZX84C2V4LT1 replace a 2.5 V Zener diode in an existing design?

The BZX84C2V4LT1 is not a direct replacement for a 2.5 V Zener due to its 2.4 V nominal voltage and 2.2–2.6 V range - using it in place of a 2.5 V part may cause premature clamping or insufficient headroom. Verify system-level tolerance margins and temperature drift impact before substitution; consider BZX84C2V7LT1 (2.7 V) if closer alignment is needed.

Is the BZX84C2V4LT1 suitable for automotive under-hood applications?

The BZX84C2V4LT1 supports a junction temperature range of −65°C to +150°C, meeting extended temperature requirements for many automotive cabin applications. However, it is not AEC-Q200 qualified, so it should not be used in safety-critical or engine-compartment locations without additional qualification testing and derating per customer reliability protocols.

BZX84C2V4LT1 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):: 2.4 V

Tolerance:: ±8%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 50 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)

BZX84C2V4LT1 FAQ

1.How can I place an order for BZX84C2V4LT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C2V4LT1 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 BZX84C2V4LT1 reliable?

The price and inventory of BZX84C2V4LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C2V4LT1 is usually 5 days.

3.What payment methods are accepted for BZX84C2V4LT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C2V4LT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C2V4LT1?

BZX84C2V4LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C2V4LT1 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 BZX84C2V4LT1?

For technical support, including BZX84C2V4LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C2V4LT1 requirements.

6.How does Aetrix verify that BZX84C2V4LT1 is sourced from the original manufacturer or authorized distributors?

All BZX84C2V4LT1 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 BZX84C2V4LT1 meets industry standards.

7.What is the process for return or replacement of BZX84C2V4LT1?

All BZX84C2V4LT1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C2V4LT1, 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 BZX84C2V4LT1 part is unused and in its original packaging.

Return procedure for BZX84C2V4LT1:

1.Submit a request within 90 days.

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

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