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

Nexperia USA Inc. 74AHCT244U/S400,02

Name: 74AHCT244U/S400,02
Brand: Nexperia USA Inc.
SKU: 74AHCT244U/S400,02
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74AHCT244U/S400,02

Manufacturer:: Nexperia USA Inc.

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: 74AHCT244U/S400,02.pdf

Description:: 74AHCT244U - Octal buffer/line d

Quantity:: RFQ Add To RFQ list

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Inventory:7,000

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Product details

Overview

74AHCT244U/S400,02 from Nexperia is a dual 4-bit non-inverting buffer/line driver with 3-state outputs, designed for bus-oriented applications requiring high-speed TTL-compatible logic levels, 5 V supply operation, and ±24 mA output drive capability. It supports bidirectional data flow control in memory address/data buses and peripheral interface circuits.

For engineers reviewing the 74AHCT244U/S400,02 datasheet, 74AHCT244U/S400,02 pinout, 74AHCT244U/S400,02 application, or 74AHCT244U/S400,02 equivalent, key selection considerations include propagation delay (typically 7.3 ns at V_CC = 5 V), output drive strength, 3-state enable timing, and compatibility with 5 V CMOS/TTL systems.

Technical Context

This device implements two independent 4-bit buffer sections, each with separate active-low output-enable (OE) controls. Each section features non-inverting logic, rail-to-rail CMOS output swing, and input thresholds compatible with TTL voltage levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V).

It operates strictly from a single 4.5 V to 5.5 V supply, with guaranteed AC and DC performance across industrial temperature range (−40 °C to +125 °C). Input clamping diodes allow hot-swap capability without damage when inputs are driven while V_CC is off.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures interoperability with legacy 5 V TTL and CMOS systems
Propagation Delay	7.3 ns max (A→Y, V_CC = 5 V) - enables reliable operation in 100 MHz bus cycles
Output Drive	±24 mA (I_OH/I_OL) - drives standard 50 Ω transmission lines or multiple TTL loads
Input Threshold	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - guarantees robust noise margin with TTL-level sources
Operating Temp	−40 °C to +125 °C - qualified for under-hood automotive and industrial control environments
ESD Rating	HBM ±2 kV - meets IEC 61000-4-2 Level 2 for board-level ESD immunity

Pinout & Package

Supplied in a 20-pin SO20 (Small Outline) package with 0.65 mm pitch, JEDEC MS-013 compliant, body width 7.5 mm, lead finish matte tin.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Inputs A1–A4, B1–B4	Non-inverting data inputs for two independent 4-bit channels
9, 19	OE1, OE2	Active-low output-enable controls per channel - enables bus isolation
10, 11, 12, 13, 15, 16, 17, 18	Outputs Y1–Y4, Z1–Z4	3-state CMOS outputs - high-impedance state prevents bus contention
20	V_CC	Positive supply terminal - must be decoupled locally with 100 nF ceramic capacitor
10	GND	Ground reference - shared return path for all inputs and outputs

Key Features

Feature	Design Value
CMOS input with TTL thresholds	Accepts standard TTL logic levels while consuming <1 µA static current
High-output drive (±24 mA)	Drives up to 15 LSTTL loads or terminates 50 Ω lines without external buffers
Hot-swappable inputs	Clamped inputs tolerate input voltages up to 5.5 V regardless of V_CC state
Independent 3-state control	Two OE pins allow selective channel disabling - critical for multi-master bus arbitration

Applications

Memory Address Buffering

Peripheral Bus Interface

Use Scenario: Driving address lines from microcontroller to SRAM or Flash memory in embedded control units.

IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control isolates memory bus during DMA transfers.

Use Value: 7.3 ns propagation delay ensures setup/hold timing margins at 100 MHz bus clock rates.

Use Scenario: Interfacing UART, SPI, or GPIO expanders to a main processor via shared data bus.

IC Role / Device Role / Timing Role: Bidirectional bus driver enabling peripheral read/write access without contention.

Use Value: Independent OE pins allow per-peripheral enable/disable - simplifies software-controlled bus arbitration.

Industrial PLC Backplane

Automotive Body Control Module

Use Scenario: Signal conditioning and level translation between modular I/O cards on a 5 V backplane.

IC Role / Device Role / Timing Role: Bus transceiver supporting hot-plug insertion of field modules.

Use Value: Input clamping diodes and −40 °C to +125 °C rating ensure reliability during module replacement.

Use Scenario: Isolating microcontroller GPIOs from power window, mirror, or lighting drivers.

IC Role / Device Role / Timing Role: Output buffer providing ±24 mA drive to discrete FET gate drivers.

Use Value: High sink/source current eliminates need for additional transistor stages in low-side switch interfaces.

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-inverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AHCT244N	DIP-20 package, same electrical specs, longer lead time and higher unit cost	Preferred for through-hole prototyping or legacy PCB rework	Select when manual soldering or socket-based testing is required
74LVC244APW	3.3 V only (1.65–3.6 V), lower drive (±24 mA still supported), smaller TSSOP20 package	Used in mixed-voltage systems where 3.3 V logic dominates	Choose only if system V_CC is 3.3 V and board space is constrained

Compared with SN74AHCT244N and 74LVC244APW, the 74AHCT244U/S400,02 offers optimal balance of 5 V compatibility, SO20 footprint, industrial temperature support, and cost-effective volume procurement - making it the preferred choice for new 5 V embedded designs.

Availability

74AHCT244U/S400,02 is available at Aetrix Electronics and suitable for memory interfacing, industrial bus expansion, and automotive body electronics requiring stable component supply and long-term lifecycle assurance.

Supply support for 74AHCT244U/S400,02 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHCT series delivers advanced high-speed CMOS logic with TTL-compatible inputs, targeting robust 5 V digital interfacing in harsh environments.

FAQ

What is the maximum clock frequency supported by 74AHCT244U/S400,02?

The device does not operate as a clocked element but functions as a combinatorial buffer. Its 7.3 ns typical propagation delay allows reliable use in synchronous bus systems running up to 100 MHz, provided setup/hold timing margins are maintained at the receiving device.

Can 74AHCT244U/S400,02 be used with 3.3 V inputs?

No. Inputs require TTL-compatible thresholds (V_IH ≥ 2.0 V), but the device must be powered from 4.5–5.5 V. Applying 3.3 V signals directly risks violating the minimum V_IH specification and may cause unreliable switching or increased static current.

Is there a pin-compatible 74AHCT244 variant with different output drive?

No. All 74AHCT244 variants-including 74AHCT244PW, 74AHCT244D, and 74AHCT244N-share identical output drive (±24 mA), propagation delay, and pinout. Differences are limited to package type and moisture sensitivity level.

Does 74AHCT244U/S400,02 support hot-swap insertion?

Yes. Its inputs feature integrated clamping diodes that safely shunt overvoltage transients to V_CC or GND, allowing signal application before power-up - a key requirement for hot-pluggable backplane and modular I/O applications.

74AHCT244U/S400,02 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

74AHCT244U/S400,02 FAQ

1.How can I place an order for 74AHCT244U/S400,02 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74AHCT244U/S400,02 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 74AHCT244U/S400,02 reliable?

The price and inventory of 74AHCT244U/S400,02 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT244U/S400,02 is usually 5 days.

3.What payment methods are accepted for 74AHCT244U/S400,02?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT244U/S400,02 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74AHCT244U/S400,02?

74AHCT244U/S400,02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74AHCT244U/S400,02 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 74AHCT244U/S400,02?

For technical support, including 74AHCT244U/S400,02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT244U/S400,02 requirements.

6.How does Aetrix verify that 74AHCT244U/S400,02 is sourced from the original manufacturer or authorized distributors?

All 74AHCT244U/S400,02 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 74AHCT244U/S400,02 meets industry standards.

7.What is the process for return or replacement of 74AHCT244U/S400,02?

All 74AHCT244U/S400,02 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT244U/S400,02, 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 74AHCT244U/S400,02 part is unused and in its original packaging.

Return procedure for 74AHCT244U/S400,02:

1.Submit a request within 90 days.

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

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