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

onsemi BZX84C68LT3

Name: BZX84C68LT3
Brand: onsemi
SKU: BZX84C68LT3
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C68LT3

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C68LT3.pdf

Description:: DIODE ZENER 68V 225MW SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:20,000

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Product details

Overview

BZX84C68LT3 from onsemi is a 68 V ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 240 Ω dynamic impedance at 5 mA test current and 130 nA reverse leakage at 54.4 V, used for precision voltage reference and overvoltage protection in portable power rails.

For engineers reviewing the BZX84C68LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (68 V), temperature coefficient (+47.6 mV/°C), capacitance (35 pF @ 0 V), ESD rating (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal voltage regulator with cathode-anode polarity, requiring no external biasing circuitry. Its Zener breakdown is specified at three test currents (2 mA, 5 mA, 20 mA), enabling stable reference generation across varying load conditions.

The BZX84C68LT3 exhibits a positive temperature coefficient of +47.6 mV/°C at 5 mA, indicating increasing Zener voltage with rising junction temperature. Its 35 pF junction capacitance at 0 V bias supports low-noise performance in filtering and clamping applications up to 1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	64–72 V @ I_ZT = 5 mA; defines regulated output voltage window under standard test condition
Power Dissipation	225 mW on FR-5 board; sets maximum continuous power handling without derating at 25°C ambient
Zener Impedance (Z_ZT)	240 Ω @ 5 mA; determines regulation stiffness-lower values yield tighter voltage control under load variation
Reverse Leakage Current	130 nA @ V_R = 54.4 V; specifies minimum off-state current in clamping mode before breakdown
Temperature Coefficient	+47.6 mV/°C @ 5 mA; quantifies drift rate of V_Z with junction temperature change
Junction Capacitance	35 pF @ V_R = 0 V, f = 1 MHz; impacts high-frequency noise suppression and signal integrity in RF-adjacent circuits
ESD Rating	Class 3 (>16 kV) per Human Body Model; ensures robustness against electrostatic discharge during handling and assembly

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential node in reverse-biased Zener configuration; forward conduction path when V_F ≤ 0.9 V @ 10 mA
2	No Connection	Internally unconnected terminal; must remain floating-no PCB trace or pad connection permitted
3	Cathode	Connected to higher-potential node; polarity band on package identifies this terminal for correct orientation during placement

Key Features

Feature	Design Value
225 mW Power Rating on FR-5 Board	Enables compact voltage regulation in space-constrained portable designs without heatsinking
Tight 68 V Nominal Zener Voltage	Provides precise reference for 60–75 V system rails, including telecom backup supplies and industrial sensor excitation
ESD Robustness >16 kV (HBM)	Eliminates need for external ESD protection in handheld and field-deployable equipment
Pb-Free (RoHS Compliant) Option	Supports environmental compliance requirements for global electronics manufacturing and export
AEC-Q101 Qualified	Validates reliability for automotive body electronics, infotainment power management, and ADAS subsystems

Applications

Automotive Body Control Module (BCM)	Industrial Sensor Signal Conditioning
Use Scenario: Stabilizing 68 V reference for LIN bus transceiver biasing and microcontroller reset supervision in 48 V vehicle architectures. IC Role / Device Role / Timing Role: Zener voltage reference providing stable threshold for undervoltage lockout (UVLO) and overvoltage detection circuits. Use Value: Maintains functional safety integrity by ensuring accurate trip points across −40°C to +125°C operating range with <±5% tolerance.	Use Scenario: Clamping transient spikes on 4–20 mA current loop outputs exposed to inductive kickback in factory automation systems. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting surge energy away from precision DAC and op-amp inputs. Use Value: Limits voltage excursion to ≤72 V during 1 kV/μs transients, preserving analog front-end accuracy and longevity.
Portable Medical Device Power Rail	5G Base Station Bias Supply
Use Scenario: Regulating auxiliary 68 V supply for ultrasound transducer driver stages in battery-powered diagnostic equipment. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator maintaining stable bias for high-voltage amplifier stages. Use Value: Delivers <130 nA leakage at 54.4 V, minimizing quiescent current drain and extending single-charge battery life.	Use Scenario: Providing reference voltage for GaN FET gate driver ICs requiring precise 68 V bootstrap supply in mmWave radio units. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing feedback loop in isolated DC-DC converters feeding RF power amplifiers. Use Value: Achieves ±0.476% voltage drift per °C, reducing thermal-induced gain error in critical RF bias paths.

Automotive Body Control Module (BCM)

Industrial Sensor Signal Conditioning

Use Scenario: Stabilizing 68 V reference for LIN bus transceiver biasing and microcontroller reset supervision in 48 V vehicle architectures.

IC Role / Device Role / Timing Role: Zener voltage reference providing stable threshold for undervoltage lockout (UVLO) and overvoltage detection circuits.

Use Value: Maintains functional safety integrity by ensuring accurate trip points across −40°C to +125°C operating range with <±5% tolerance.

Use Scenario: Clamping transient spikes on 4–20 mA current loop outputs exposed to inductive kickback in factory automation systems.

IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting surge energy away from precision DAC and op-amp inputs.

Use Value: Limits voltage excursion to ≤72 V during 1 kV/μs transients, preserving analog front-end accuracy and longevity.

Portable Medical Device Power Rail

5G Base Station Bias Supply

Use Scenario: Regulating auxiliary 68 V supply for ultrasound transducer driver stages in battery-powered diagnostic equipment.

IC Role / Device Role / Timing Role: Low-power Zener shunt regulator maintaining stable bias for high-voltage amplifier stages.

Use Value: Delivers <130 nA leakage at 54.4 V, minimizing quiescent current drain and extending single-charge battery life.

Use Scenario: Providing reference voltage for GaN FET gate driver ICs requiring precise 68 V bootstrap supply in mmWave radio units.

IC Role / Device Role / Timing Role: Precision voltage reference stabilizing feedback loop in isolated DC-DC converters feeding RF power amplifiers.

Use Value: Achieves ±0.476% voltage drift per °C, reducing thermal-induced gain error in critical RF bias paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84C68LT1G	Pb-free variant with identical electrical specs and SOT-23 package; differs only in RoHS-compliant plating and tape/reel quantity (3,000 vs. 10,000)	Required for EU/China RoHS-regulated production; same thermal and electrical behavior in all PCB layouts	Select BZX84C68LT1G when lead-free compliance is mandatory; no design or layout changes needed
SZBZX84C68LT3G	AEC-Q101 qualified version with automotive-grade process controls and extended PPAP documentation support	Required for automotive OEM Tier-1 BOMs; supports zero-defect manufacturing and long-term supply continuity programs	Choose SZBZX84C68LT3G for automotive applications where qualification evidence and traceability are contractually required

Compared with BZX84C68LT3, the BZX84C68LT1G offers identical performance with Pb-free finish for regulatory compliance, while SZBZX84C68LT3G adds AEC-Q101 validation and PPAP readiness-making it suitable for automotive deployment where process rigor and supply chain assurance are critical.

Availability

BZX84C68LT3 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical power rails, and 5G base station bias supplies requiring stable component supply with full traceability and lifecycle management.

Supply support for BZX84C68LT3 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 BZX84C68LT3 belongs to the BZX84CxxxLT1/LT3 Zener regulator family, engineered for high-density surface-mount voltage reference and protection in portable, automotive, and industrial systems where space, reliability, and ESD robustness are critical.

FAQ

What is the Zener voltage tolerance of the BZX84C68LT3?

The BZX84C68LT3 has a nominal Zener voltage of 68 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 64 V and 72 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet, and applies specifically to the BZX84C68LT3 variant under standard 25°C ambient conditions.

Does the BZX84C68LT3 have a built-in capacitor or require external filtering?

No, the BZX84C68LT3 is a discrete Zener diode with no integrated capacitor. Its junction capacitance is 35 pF at 0 V bias and 1 MHz, which is inherent to the PN junction-not an added component. External RC filters may be used depending on application noise requirements, but the BZX84C68LT3 itself functions as a passive two-terminal regulator without auxiliary elements.

Can the BZX84C68LT3 be used in place of the BZX84C62LT1 or BZX84C75LT1?

No-BZX84C68LT3 is not a direct substitute for BZX84C62LT1 (62 V) or BZX84C75LT1 (75 V), as each part has distinct Zener voltage ratings and corresponding impedance/leakage characteristics. Substitution would alter regulation thresholds and potentially compromise circuit safety margins; the BZX84C68LT3 must be selected only where 68 V nominal regulation is explicitly required.

What is the maximum reverse leakage current for the BZX84C68LT3, and at what voltage is it measured?

The maximum reverse leakage current for the BZX84C68LT3 is 130 nA, measured at a reverse voltage (V_R) of 54.4 V-equivalent to 80% of its nominal 68 V Zener voltage. This value is specified in the "Max Reverse Leakage Current" column of the BZX84CxxxLT1 series table on page 3 of the onsemi datasheet and reflects worst-case off-state conduction prior to breakdown.

Is the second pin (Pin 2) of the BZX84C68LT3 internally connected or should it be left unconnected on the PCB?

Pin 2 of the BZX84C68LT3 is explicitly designated as "No Connection" in the marking diagram and Electrical Characteristics section of the datasheet. It is internally unconnected and must remain floating-no PCB trace, pad, or via should be attached to Pin 2, as doing so could compromise device reliability or cause unintended current paths.

BZX84C68LT3 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):: 68 V

Tolerance:: ±6%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 240 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 47.6 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)

BZX84C68LT3 FAQ

1.How can I place an order for BZX84C68LT3 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C68LT3 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 BZX84C68LT3 reliable?

The price and inventory of BZX84C68LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C68LT3 is usually 5 days.

3.What payment methods are accepted for BZX84C68LT3?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C68LT3 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C68LT3?

BZX84C68LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C68LT3 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 BZX84C68LT3?

For technical support, including BZX84C68LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C68LT3 requirements.

6.How does Aetrix verify that BZX84C68LT3 is sourced from the original manufacturer or authorized distributors?

All BZX84C68LT3 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 BZX84C68LT3 meets industry standards.

7.What is the process for return or replacement of BZX84C68LT3?

All BZX84C68LT3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C68LT3, 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 BZX84C68LT3 part is unused and in its original packaging.

Return procedure for BZX84C68LT3:

1.Submit a request within 90 days.

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

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