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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74LCX241SJX

Name: 74LCX241SJX
Brand: onsemi
SKU: 74LCX241SJX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCX241SJX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: 74LCX241SJX.pdf

Description:: IC BUFFER NON-INVERT 3.6V 20SOP

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Product details

Overview

74LCX241SJX from Fairchild Semiconductor is a low-voltage octal buffer/line driver with 5V-tolerant inputs and outputs, designed for memory address driving, clock distribution, and bus-oriented data transmission in 2.5V/3.3V systems interfacing to 5V logic. It operates from 2.3V to 3.6V V_CC, delivers 6.5 ns max propagation delay at 3.3V, supports 3-STATE output control via dual OE pins, and features power-down high-impedance I/O.

For engineers reviewing the 74LCX241SJX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V tolerance on all I/Os, dual independent 3-STATE enables (OE1/OE2), guaranteed 2.3–3.6V operation, sub-7 ns t_PD, and ESD robustness (HBM >2000V).

Technical Context

The 74LCX241SJX implements two independent 4-bit groups (I0–I3/O0–O3 controlled by OE1; I4–I7/O4–O7 controlled by OE2), enabling selective bus gating without full device disable. Its advanced CMOS process ensures high-speed switching while maintaining low ICC (≤10 µA quiescent) and low dynamic power dissipation (CPD = 25 pF).

Input and output structures are engineered for 5V tolerance across the full 0–5.5V input voltage range, allowing safe interfacing with legacy 5V TTL/CMOS buses while powered from 2.5V or 3.3V supplies. The device includes patented noise/EMI reduction circuitry and exceeds 500 mA latch-up immunity per JEDEC JESD78.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3 V to 3.6 V - Valid operating supply for guaranteed timing and logic levels
Propagation Delay (t_PD)	6.5 ns max at V_CC = 3.3 V - Enables use in ≤150 MHz bus clock domains with margin
I/O Voltage Tolerance	0 V to 5.5 V - Allows direct connection to 5V buses without level shifters
Output Drive (I_OL/I_OH)	24 mA sink/source at V_CC = 3.0 V - Sufficient for driving 50 Ω transmission lines or multiple TTL loads
Quiescent ICC	10 µA max - Supports ultra-low-power standby states in battery-backed systems
ESD Rating (HBM)	>2000 V - Meets industrial handling requirements without additional protection
Operating Temperature	−40 °C to +85 °C - Qualified for extended industrial ambient environments

Pinout & Package

74LCX241SJX is packaged in a Pb-free 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D), with standard 1.27 mm pitch and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Independent 3-STATE enable inputs - Low-active control of first and second 4-bit groups
2–5, 11–14	I0–I3, I4–I7	Buffer inputs - Accept 0–5.5 V signals regardless of V_CC level
6–9, 15–18	O0–O3, O4–O7	Buffer outputs - Provide 5V-tolerant 3-STATE outputs with 24 mA drive capability
10	GND	Ground reference - Must be connected to system ground plane for noise immunity
20	V_CC	Power supply - Supplies internal logic; must be 2.3–3.6 V; decoupling capacitor required

Key Features

Feature	Design Value
Dual independent 3-STATE enables	OE1 and OE2 allow granular control of two 4-bit segments - reduces bus contention during partial updates
5V-tolerant I/O architecture	Inputs and outputs withstand 0–5.5 V regardless of V_CC - eliminates external level translators in mixed-voltage systems
Live insertion/withdrawal support	High-impedance I/O during power transitions - prevents back-driving when hot-plugging into live backplanes
Noise/EMI reduction circuitry	Patented design minimizes simultaneous switching noise - improves signal integrity on dense PCBs
Low quiescent current	10 µA max ICC - extends battery life in portable applications with intermittent bus activity

Applications

Memory Address Buffering	PCI/ISA Bus Interface
Use Scenario: Driving address lines from a 3.3V microcontroller to a 5V SRAM or Flash memory array. IC Role / Device Role / Timing Role: Level-translating octal buffer ensuring setup/hold timing compliance across voltage domains. Use Value: Eliminates discrete level shifters while guaranteeing 6.5 ns t_PD and 5V-tolerant outputs compatible with TTL input thresholds.	Use Scenario: Isolating and buffering control/data signals between a 3.3V host CPU and legacy 5V PCI or ISA peripheral cards. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control for read/write direction management. Use Value: Dual OE pins enable precise timing of data latching and bus release, reducing contention during burst transfers.
Low-Power Clock Distribution	Industrial Control Backplane
Use Scenario: Distributing a 3.3V system clock to multiple 5V-tolerant peripherals (e.g., ADCs, DACs, UARTs) in a sensor node. IC Role / Device Role / Timing Role: Non-inverting clock buffer with matched propagation delays across all eight outputs. Use Value: 1.0 ns max output-to-output skew ensures synchronous sampling across multi-channel analog front-ends.	Use Scenario: Interfacing a 2.5V FPGA I/O bank to a 5V industrial I/O module over a 20 cm backplane trace. IC Role / Device Role / Timing Role: Robust line driver with ESD-hardened I/O and latch-up immunity (>500 mA). Use Value: Withstands harsh industrial EMI and transient coupling without protection diodes or ferrites.

Memory Address Buffering

PCI/ISA Bus Interface

Use Scenario: Driving address lines from a 3.3V microcontroller to a 5V SRAM or Flash memory array.

IC Role / Device Role / Timing Role: Level-translating octal buffer ensuring setup/hold timing compliance across voltage domains.

Use Value: Eliminates discrete level shifters while guaranteeing 6.5 ns t_PD and 5V-tolerant outputs compatible with TTL input thresholds.

Use Scenario: Isolating and buffering control/data signals between a 3.3V host CPU and legacy 5V PCI or ISA peripheral cards.

IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control for read/write direction management.

Use Value: Dual OE pins enable precise timing of data latching and bus release, reducing contention during burst transfers.

Low-Power Clock Distribution

Industrial Control Backplane

Use Scenario: Distributing a 3.3V system clock to multiple 5V-tolerant peripherals (e.g., ADCs, DACs, UARTs) in a sensor node.

IC Role / Device Role / Timing Role: Non-inverting clock buffer with matched propagation delays across all eight outputs.

Use Value: 1.0 ns max output-to-output skew ensures synchronous sampling across multi-channel analog front-ends.

Use Scenario: Interfacing a 2.5V FPGA I/O bank to a 5V industrial I/O module over a 20 cm backplane trace.

IC Role / Device Role / Timing Role: Robust line driver with ESD-hardened I/O and latch-up immunity (>500 mA).

Use Value: Withstands harsh industrial EMI and transient coupling without protection diodes or ferrites.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC244APW,118	Single 8-bit group; single OE; 1.65–3.6V V_CC; 3.5 ns t_PD at 3.3V	Lacks dual OE segmentation; tighter V_CC min; faster but less flexible bus partitioning	Preferred when full 8-bit enable suffices and speed is critical; not suitable for split-bus gating
SN74LVCH244AQPWRQ1	Automotive-grade (AEC-Q100); 1.65–3.6V V_CC; 4.2 ns t_PD; no 5V tolerance on outputs	Requires external clamping for 5V bus interfacing; qualified for automotive temperature range (−40°C to +125°C)	Select for automotive ECUs needing higher reliability; avoid where native 5V output tolerance is required

Compared with 74LCX241SJX, the 74LVC244APW offers higher speed but loses independent 4-bit control, while SN74LVCH244AQPWRQ1 adds automotive qualification but removes 5V output tolerance-making 74LCX241SJX uniquely suited for industrial 3.3V-to-5V bus bridging with segmented enable.

Availability

74LCX241SJX is available at Aetrix Electronics and suitable for memory address buffering, PCI/ISA interface design, and low-power clock distribution requiring stable component supply, long-term lifecycle assurance, and consistent Pb-free sourcing.

Supply support for 74LCX241SJX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, signal conditioning, and logic ICs before its acquisition by ON Semiconductor in 2016.

The LCX family-including 74LCX241SJX-was engineered for low-voltage, high-speed logic interfacing in mixed-signal systems, targeting 2.5V/3.3V core logic with legacy 5V peripheral compatibility.

FAQ

What is the maximum input voltage the 74LCX241SJX can tolerate on its I/O pins?

The 74LCX241SJX supports DC input voltages from 0 V to 5.5 V on all I/O pins-regardless of V_CC level-enabling direct interfacing with 5V TTL and CMOS buses without external level-shifting components. This 5V tolerance is specified across the full operating temperature range (−40°C to +85°C) and applies to both inputs and outputs in HIGH, LOW, and 3-STATE conditions.

Does the 74LCX241SJX support live insertion into a powered system?

Yes, the 74LCX241SJX supports live insertion/withdrawal due to its power-down high-impedance inputs and outputs. When V_CC is unpowered or ramping, all I/Os enter a high-impedance state that prevents back-driving of the bus. To ensure robust behavior, OE should be tied to V_CC and OE to GND through a current-limiting resistor per Fairchild's application note guidance for the 74LCX241SJX.

What is the propagation delay specification for the 74LCX241SJX at 2.5V V_CC?

At V_CC = 2.5 V ± 0.2 V and C_L = 30 pF, the 74LCX241SJX has a maximum propagation delay (t_PHL/t_PLH) of 7.8 ns. This value is measured under standard AC test conditions and guarantees timing margins for 125 MHz bus operation with appropriate setup/hold allowances.

How many independent 3-STATE control inputs does the 74LCX241SJX have?

The 74LCX241SJX has two independent 3-STATE enable inputs: OE1 controls outputs O0–O3, and OE2 controls outputs O4–O7. This dual-enable architecture allows selective gating of two 4-bit segments-critical for partial bus updates, multiplexed address decoding, or interleaved data transfers without disabling the entire device.

Is the 74LCX241SJX pin-compatible with other members of the LCX family such as the 74LCX244?

No, the 74LCX241SJX is not pin-compatible with the 74LCX244. While both are octal buffers in the LCX family, the 74LCX241SJX uses a 20-pin SOP package with dual OE inputs (pins 1 and 19) and separate I/O groupings, whereas the 74LCX244 has different pin assignments-including a single OE and inverted/non-inverted output pairing. Board layout must be verified against the 74LCX241SJX-specific connection diagram.

74LCX241SJX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCX

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOP

74LCX241SJX FAQ

1.How can I place an order for 74LCX241SJX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCX241SJX 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 74LCX241SJX reliable?

The price and inventory of 74LCX241SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX241SJX is usually 5 days.

3.What payment methods are accepted for 74LCX241SJX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX241SJX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCX241SJX?

74LCX241SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCX241SJX 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 74LCX241SJX?

For technical support, including 74LCX241SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX241SJX requirements.

6.How does Aetrix verify that 74LCX241SJX is sourced from the original manufacturer or authorized distributors?

All 74LCX241SJX 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 74LCX241SJX meets industry standards.

7.What is the process for return or replacement of 74LCX241SJX?

All 74LCX241SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX241SJX, 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 74LCX241SJX part is unused and in its original packaging.

Return procedure for 74LCX241SJX:

1.Submit a request within 90 days.

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

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