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

Texas Instruments 74ACT11240NT

Name: 74ACT11240NT
Brand: Texas Instruments
SKU: 74ACT11240NT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ACT11240NT

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-DIP (0.300", 7.62mm)

Datasheet:: 74ACT11240NT.pdf

Description:: IC BUFF INVERT 5.5V 24DIP

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Product details

Overview

74ACT11240NT from Texas Instruments is an octal inverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in TTL-compatible systems. It operates from −40°C to 85°C, supports 5-V supply (4.5–5.5 V), delivers ±24 mA output drive, and features flow-through pinout for optimized PCB layout.

For engineers reviewing the 74ACT11240NT datasheet, 74ACT11240NT pinout, 74ACT11240NT application, or 74ACT11240NT equivalent, key selection criteria include 3-state control timing (tPZH ≤ 10 ns), TTL-input compatibility, symmetrical active-low OE inputs, and PDIP-24 packaging for through-hole prototyping and legacy industrial systems.

Technical Context

This device implements dual 4-bit inverting buffers (Groups 1 and 2), each with independent active-low output-enable (OE) control. All inputs accept TTL-voltage levels (VIL ≤ 0.8 V, VIH ≥ 2 V), enabling direct interfacing with legacy 74LS and 74F logic without level-shifting.

Its EPIC (Enhanced-Performance Implanted CMOS) 1-μm process ensures latch-up immunity of 500 mA at 125°C and low dynamic power dissipation - 13 pF typical power-dissipation capacitance per buffer when outputs are disabled, rising to 47 pF when enabled at 1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS rails; no external regulation required.
Output Drive	±24 mA - sufficient to drive 15–20 TTL loads or terminate unterminated transmission lines on backplanes.
Propagation Delay	tPLH/tPHL ≤ 10.6 ns - enables reliable operation up to ~50 MHz clock distribution in non-critical paths.
3-State Enable Time	tPZH ≤ 10 ns - fast output disable supports time-multiplexed bus arbitration with minimal contention window.
Input Compatibility	TTL-level inputs (VIH ≥ 2 V, VIL ≤ 0.8 V) - eliminates need for input translators when interfacing with 74LS/ALS families.
Operating Temperature	−40°C to +85°C - qualified for industrial environments including factory automation and instrumentation.
Power Dissipation Cap.	47 pF (enabled), 13 pF (disabled) - reduces switching current and system-level EMI in high-density layouts.

Pinout & Package

74ACT11240NT uses a 24-pin plastic DIP (PDIP) package with 300-mil width and through-hole mounting. Pin 1 is top-left corner (notch-down orientation); VCC (Pin 14) and GND (Pins 7, 8, 10, 11) are centrally located to minimize switching noise.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Group 1 Inputs (1A1–1A4)	Inverting data inputs for first 4-bit buffer group; TTL-compatible voltage thresholds.
5	Group 1 Output Enable (1OE)	Active-low enable controlling Y1–Y4; tied low to activate, high to tri-state.
6, 7, 8, 9	Group 1 Outputs (1Y1–1Y4)	Inverted buffered outputs; high-impedance when 1OE = high.
10, 11, 12, 13	Group 2 Inputs (2A1–2A4)	Second independent 4-bit inverting input group; electrically isolated from Group 1.
15	Group 2 Output Enable (2OE)	Independent active-low enable for Y1–Y4 of second group; supports dual-bus control.
16, 17, 18, 19	Group 2 Outputs (2Y1–2Y4)	Outputs mirror Group 1 behavior but with separate OE control and signal path.
14	VCC	Positive supply (4.5–5.5 V); center-pin placement reduces ground bounce during switching.
7, 8, 10, 11	GND	Four dedicated ground pins - lowers impedance return path and improves noise margin.

Key Features

Feature	Design Value
Flow-through architecture	Input-to-output pin mapping (e.g., A1→Y1 adjacent) minimizes trace crossovers and layer count in dense PCBs.
Center-pin VCC/GND	Dual VCC (Pin 14) and four GND pins (7,8,10,11) reduce simultaneous switching noise by shortening current loops.
EPIC 1-μm CMOS process	Enables 500-mA latch-up immunity at 125°C - critical for reliability in unregulated or thermally constrained enclosures.
High fan-out capability	±24 mA drive per output supports >20 LS-TTL loads - eliminates need for additional bus buffers in mid-density systems.
Symmetrical OE inputs	Separate active-low 1OE and 2OE allow independent control of two 4-bit buses - simplifies address/data multiplexing logic.

Applications

Memory Address Buffering	Legacy Bus Interface
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/ROM in industrial PLCs. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation and fan-out amplification for address lines A0–A15. Use Value: Eliminates timing skew between address bits due to matched tPLH/tPHL (≤10.6 ns) and flow-through pinout.	Use Scenario: Interfacing 8-bit microprocessor (e.g., Z80) with peripheral I/O chips using shared data bus. IC Role / Device Role / Timing Role: Bidirectional 3-state line driver enabling time-multiplexed read/write cycles on common bus lines. Use Value: Fast tPZH (≤10 ns) and tPLZ (≤10.8 ns) ensure clean bus release before next cycle begins.
Industrial Backplane Driver	Test Equipment Signal Conditioning
Use Scenario: Distributing clock and control signals across multi-slot backplane in modular DAQ systems. IC Role / Device Role / Timing Role: Low-skew inverting buffer isolating master controller from capacitive loading of long parallel traces. Use Value: 47-pF enabled Cpd limits dynamic current draw, reducing crosstalk and ground bounce on shared backplane rails.	Use Scenario: Level-shifting and buffering digital trigger signals in automated test equipment (ATE) with mixed-voltage subsystems. IC Role / Device Role / Timing Role: TTL-input compatible buffer converting 3.3-V FPGA outputs to robust 5-V logic levels for relay drivers and analog switches. Use Value: Guaranteed VIH ≥ 2 V and VIL ≤ 0.8 V ensure noise-immune detection of marginal logic edges from upstream sources.

Memory Address Buffering

Legacy Bus Interface

Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/ROM in industrial PLCs.

IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation and fan-out amplification for address lines A0–A15.

Use Value: Eliminates timing skew between address bits due to matched tPLH/tPHL (≤10.6 ns) and flow-through pinout.

Use Scenario: Interfacing 8-bit microprocessor (e.g., Z80) with peripheral I/O chips using shared data bus.

IC Role / Device Role / Timing Role: Bidirectional 3-state line driver enabling time-multiplexed read/write cycles on common bus lines.

Use Value: Fast tPZH (≤10 ns) and tPLZ (≤10.8 ns) ensure clean bus release before next cycle begins.

Industrial Backplane Driver

Test Equipment Signal Conditioning

Use Scenario: Distributing clock and control signals across multi-slot backplane in modular DAQ systems.

IC Role / Device Role / Timing Role: Low-skew inverting buffer isolating master controller from capacitive loading of long parallel traces.

Use Value: 47-pF enabled Cpd limits dynamic current draw, reducing crosstalk and ground bounce on shared backplane rails.

Use Scenario: Level-shifting and buffering digital trigger signals in automated test equipment (ATE) with mixed-voltage subsystems.

IC Role / Device Role / Timing Role: TTL-input compatible buffer converting 3.3-V FPGA outputs to robust 5-V logic levels for relay drivers and analog switches.

Use Value: Guaranteed VIH ≥ 2 V and VIL ≤ 0.8 V ensure noise-immune detection of marginal logic edges from upstream sources.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74ACT11244NT	Non-inverting output polarity; identical pinout, timing, and drive specs.	Used where signal inversion must be avoided (e.g., direct address mirroring without complement logic).	Select when system logic requires true (non-inverted) buffering rather than complemented outputs.
SN74ACT240N	Same function and pinout; TI's newer manufacturing revision with tighter VOH/VOL specs (VOH min = 3.94 V @ 4.5 V).	Drop-in replacement for new designs requiring improved output voltage margins under load.	Prefer for production builds where higher noise immunity at VOH/VOL extremes is required.

Compared with 74ACT11240NT, the 74ACT11244NT provides identical drive and timing but preserves input logic polarity, while SN74ACT240N offers enhanced output voltage compliance - both serve as functional alternatives where inversion tolerance or voltage margin dictates selection.

Availability

74ACT11240NT is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment, and embedded instrumentation requiring stable component supply and through-hole manufacturability.

Supply support for 74ACT11240NT 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in industrial-grade logic families.

The 74ACT series was engineered for high-speed, low-noise 5-V CMOS logic interoperability with TTL systems - targeting memory interfaces, bus transceivers, and control-plane signal conditioning in rugged environments.

FAQ

What is the maximum operating temperature range for the 74ACT11240NT?

The 74ACT11240NT is characterized for operation from −40°C to +85°C. This industrial temperature range is verified per the recommended operating conditions table in the official Texas Instruments datasheet SCAS210A, making it suitable for deployment in factory automation, motor drives, and outdoor instrumentation without thermal derating.

Does the 74ACT11240NT support TTL-level inputs directly?

Yes, the 74ACT11240NT accepts TTL-voltage compatible inputs: VIH ≥ 2 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V. This allows direct connection to 74LS, 74F, and other legacy TTL families without interface resistors or level shifters - a key design feature confirmed in the "Inputs Are TTL-Voltage Compatible" section of the datasheet.

What is the output drive capability of the 74ACT11240NT?

The 74ACT11240NT delivers ±24 mA per output at VCC = 4.5–5.5 V, as specified under IOL and IOH in the electrical characteristics table. This enables reliable driving of up to 20 standard TTL loads or termination of unterminated 50-Ω transmission lines - validated across the full −40°C to +85°C operating range.

Is the 74ACT11240NT pin-compatible with other octal buffers in the ACT family?

Yes, the 74ACT11240NT shares identical pinout and function with 74ACT11244NT (non-inverting) and SN74ACT240N (same inverting function). All use 24-pin PDIP (NT) packaging with matching pin assignments for inputs, outputs, OE controls, VCC, and GND - confirmed via logic diagrams and package drawings in SCAS210A and TI's packaging addendum.

What package type does the 74ACT11240NT use, and is it RoHS-compliant?

The 74ACT11240NT uses a 24-pin plastic DIP (PDIP) package with 300-mil width (package drawing NT). Per TI's Packaging Information Addendum, it is marked "Pb-Free (RoHS)" with CU NIPDAU finish and carries no MSL rating (N/A for through-hole packages), confirming full RoHS compliance for lead-free soldering processes.

74ACT11240NT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

Package/Case:: 24-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Buffer, 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:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 24-PDIP

74ACT11240NT FAQ

1.How can I place an order for 74ACT11240NT through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ACT11240NT 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 74ACT11240NT reliable?

The price and inventory of 74ACT11240NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11240NT is usually 5 days.

3.What payment methods are accepted for 74ACT11240NT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11240NT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ACT11240NT?

74ACT11240NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ACT11240NT 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 74ACT11240NT?

For technical support, including 74ACT11240NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11240NT requirements.

6.How does Aetrix verify that 74ACT11240NT is sourced from the original manufacturer or authorized distributors?

All 74ACT11240NT 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 74ACT11240NT meets industry standards.

7.What is the process for return or replacement of 74ACT11240NT?

All 74ACT11240NT units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11240NT, 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 74ACT11240NT part is unused and in its original packaging.

Return procedure for 74ACT11240NT:

1.Submit a request within 90 days.

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

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