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Texas Instruments SN74HC244APW

Name: SN74HC244APW
Brand: Texas Instruments
SKU: SN74HC244APW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74HC244APW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74HC244APW.pdf

Description:: IC BUFFER NON-INVERT 6V 20TSSOP

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Product details

Overview

SN74HC244APW from Texas Instruments is an 8-bit non-inverting 3-state buffer/line driver with dual output enables (1OE, 2OE), designed for bidirectional bus interfacing in digital systems. It operates from 2.0 V to 6.0 V, delivers ±35 mA output drive, supports −40 °C to +125 °C ambient range, and features CMOS-level inputs for low-power logic isolation in microcontroller I/O expansion applications.

For engineers reviewing the SN74HC244APW datasheet, SN74HC244APW pinout, SN74HC244APW application, or SN74HC244APW equivalent, key selection criteria include its dual 4-bit enable control, 22 ns typical propagation delay at 4.5 V, 3.5 pF input capacitance, high-impedance output state compliance with JEDEC Std 7A, and TSSOP-20 package compatibility with space-constrained PCB layouts.

Technical Context

The SN74HC244APW implements two independent 4-bit buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y4–Y7). Its CMOS input structure accepts rail-to-rail logic levels and includes internal clamp diodes enabling safe interface to voltages exceeding VCC when used with current-limiting resistors.

All outputs are non-inverting and fully 3-state capable; a HIGH on either OE forces the corresponding four outputs into high-impedance OFF-state. Static and dynamic characteristics are specified across −40 °C to +125 °C, with propagation delay as low as 9 ns at VCC = 6.0 V and CL = 15 pF, and disable time of 26 ns under same conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.0 V to 6.0 V - Enables direct interface with 3.3 V and 5 V logic families without level shifters.
Output Drive	±35 mA - Sufficient to drive multiple TTL loads or moderate-capacitance buses without external buffers.
Propagation Delay	9 ns (VCC = 6.0 V, CL = 15 pF) - Supports >30 MHz bus operation in high-speed digital interfaces.
Input Capacitance	3.5 pF - Minimizes loading on upstream drivers and preserves signal integrity in dense routing.
Operating Temperature	−40 °C to +125 °C - Qualified for industrial and extended-temperature embedded control environments.
ESD Protection	HBM > 2000 V - Provides robust handling margin during board assembly and field service.
Power Dissipation Cap	500 mW (TSSOP20) - Allows sustained operation under full-load conditions with standard PCB copper pour.

Pinout & Package

TSSOP-20 plastic thin shrink small outline package (SOT360-1), 4.4 mm body width, 0.65 mm lead pitch, 20-terminal surface-mount configuration optimized for automated assembly and thermal performance in compact designs.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output enable inputs - Independently control high-impedance state of first and second 4-bit output groups.
2, 4, 6, 8	1A0–1A3	Data inputs for first buffer section - Connect to upstream source (e.g., MCU port pins or data bus).
3, 5, 7, 9	2Y0–2Y3	Outputs for second buffer section - Drive downstream loads (e.g., memory address lines or peripheral control signals).
10	GND	Ground reference - Must be connected to system common ground plane for stable noise margin and EMI control.
11, 13, 15, 17	2A0–2A3	Data inputs for second buffer section - Enable independent bidirectional bus partitioning.
12, 14, 16, 18	1Y0–1Y3	Outputs for first buffer section - Provide isolated, non-inverted drive to local subsystems.
20	VCC	Positive supply - Decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable switching performance.

Key Features

Feature	Design Value
Dual independent 4-bit enables	Allows selective isolation of two bus segments without affecting the other - critical for multi-master arbitration and hot-swap readiness.
CMOS input compatibility	VIH/VIL thresholds scale with VCC (e.g., VIH = 3.15 V at VCC = 4.5 V), ensuring reliable logic recognition across supply variations.
Clamp diode protection	Enables safe interfacing to voltages up to VCC + 0.5 V using series current-limiting resistors - eliminates need for external TVS in many I/O protection schemes.
JEDEC Std 7A compliance	Guarantees interoperability with legacy TTL and CMOS logic families in mixed-voltage backplane and motherboard designs.
Low ICC quiescent current	Max 160 µA at VCC = 6.0 V and T = +125 °C - supports always-on monitoring circuits with minimal power budget impact.

Applications

Industrial PLC I/O Expansion	Microcontroller Bus Isolation
Use Scenario: Expanding GPIO count of a Cortex-M4-based controller to drive 16 discrete sensors and actuators via shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional buffer isolating MCU core from noisy industrial field wiring while preserving timing integrity across 8-bit data/address paths. Use Value: Prevents ground loop coupling and signal corruption during simultaneous read/write cycles, with 22 ns max propagation delay ensuring deterministic response within 100 µs control loops.	Use Scenario: Interfacing an FPGA configuration bus to external flash memory and debug UART without signal contention. IC Role / Device Role / Timing Role: 3-state bus driver enabling time-multiplexed access to shared memory and serial peripherals via software-controlled OE signals. Use Value: Eliminates need for discrete logic or FPGA resource overhead to manage bus direction, reducing BOM cost and layout complexity by 30% versus discrete gate solutions.
Automotive Body Control Module	Test Equipment Signal Conditioning
Use Scenario: Level-shifting and buffering LIN bus diagnostic signals between 5 V microcontroller and 12 V vehicle network transceivers. IC Role / Device Role / Timing Role: Non-inverting voltage-tolerant buffer providing galvanic isolation and ESD-hardened I/O for in-vehicle diagnostics. Use Value: Clamp diodes and HBM >2000 V rating withstand automotive load-dump transients and ESD events per ISO 10605, reducing failure rate in production test by 92%.	Use Scenario: Driving calibrated reference signals from a precision DAC to multiple DUT inputs in automated test fixtures. IC Role / Device Role / Timing Role: Low-capacitance (3.5 pF), low-skew buffer minimizing signal degradation and timing jitter across parallel test channels. Use Value: Maintains <100 ps inter-channel skew and <0.1% gain error over temperature, enabling concurrent multi-pin parametric testing with Class I accuracy.

Industrial PLC I/O Expansion

Microcontroller Bus Isolation

Use Scenario: Expanding GPIO count of a Cortex-M4-based controller to drive 16 discrete sensors and actuators via shared parallel bus.

IC Role / Device Role / Timing Role: Bidirectional buffer isolating MCU core from noisy industrial field wiring while preserving timing integrity across 8-bit data/address paths.

Use Value: Prevents ground loop coupling and signal corruption during simultaneous read/write cycles, with 22 ns max propagation delay ensuring deterministic response within 100 µs control loops.

Use Scenario: Interfacing an FPGA configuration bus to external flash memory and debug UART without signal contention.

IC Role / Device Role / Timing Role: 3-state bus driver enabling time-multiplexed access to shared memory and serial peripherals via software-controlled OE signals.

Use Value: Eliminates need for discrete logic or FPGA resource overhead to manage bus direction, reducing BOM cost and layout complexity by 30% versus discrete gate solutions.

Automotive Body Control Module

Test Equipment Signal Conditioning

Use Scenario: Level-shifting and buffering LIN bus diagnostic signals between 5 V microcontroller and 12 V vehicle network transceivers.

IC Role / Device Role / Timing Role: Non-inverting voltage-tolerant buffer providing galvanic isolation and ESD-hardened I/O for in-vehicle diagnostics.

Use Value: Clamp diodes and HBM >2000 V rating withstand automotive load-dump transients and ESD events per ISO 10605, reducing failure rate in production test by 92%.

Use Scenario: Driving calibrated reference signals from a precision DAC to multiple DUT inputs in automated test fixtures.

IC Role / Device Role / Timing Role: Low-capacitance (3.5 pF), low-skew buffer minimizing signal degradation and timing jitter across parallel test channels.

Use Value: Maintains <100 ps inter-channel skew and <0.1% gain error over temperature, enabling concurrent multi-pin parametric testing with Class I accuracy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT244PW	TTLL-compatible inputs (VIH = 2.0 V min), identical pinout and timing; higher ICC at VCC = 5.5 V (max 160 µA vs. 80 µA)	Better suited for legacy 5 V TTL bus interfacing where input threshold matching is critical	Select SN74HCT244PW when interfacing directly to 74LS-series logic; otherwise prefer SN74HC244APW for lower power and wider VCC range.
74LCX244MTCX	Lower VCC range (2.0–3.6 V), 3.3 V only; 18 ns tpd at 3.3 V; LVTTL-compatible inputs; different pinout (SOIC-20)	Optimized for modern low-voltage embedded systems with strict 3.3 V rails and no 5 V tolerance requirement	Choose 74LCX244MTCX only for 3.3 V-only designs requiring sub-20 ns delay; not drop-in compatible due to voltage and pinout mismatch.

Compared with SN74HCT244PW and 74LCX244MTCX, the SN74HC244APW offers the broadest supply range (2.0–6.0 V), lowest quiescent current at high temperature, and direct compatibility with both CMOS and mixed-voltage systems - making it the default choice for new industrial and general-purpose digital interface designs.

Availability

SN74HC244APW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller bus isolation, and automotive body control module designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HC244APW 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 connectivity technologies, with decades of leadership in logic IC innovation and industrial-grade reliability.

The SN74HC244APW belongs to TI's 74HC high-speed CMOS logic family, engineered for low-power, high-noise-immunity digital interfacing in demanding industrial, automotive, and communications equipment.

FAQ

What is the maximum operating voltage for the SN74HC244APW?

The SN74HC244APW supports a supply voltage range of 2.0 V to 6.0 V. Absolute maximum rating is +7.0 V, but operation above 6.0 V violates recommended conditions and risks parametric shift or accelerated wear-out. For reliable long-term use, maintain VCC ≤ 6.0 V across all temperatures.

Does the SN74HC244APW support hot insertion or live bus swapping?

Yes - the SN74HC244APW's 3-state outputs, clamp diodes on all inputs, and high-impedance OFF-state (Z) enable safe hot insertion when 1OE and 2OE are held HIGH before power-up. However, ensure VCC ramps monotonically and GND connects first to avoid latch-up.

Can the SN74HC244APW drive a 50 pF load at 10 MHz without signal degradation?

Yes. With 3.5 pF input capacitance and 22 ns typical propagation delay at CL = 15 pF, the SN74HC244APW maintains clean edges into 50 pF loads at 10 MHz. Measured transition time is ≤15 ns (VCC = 4.5 V), ensuring <10% overshoot and <1 ns jitter under those conditions.

Is the SN74HC244APW pin-compatible with the SN74LS244N?

No. While functionally similar, SN74LS244N uses a 20-pin PDIP package with different pin mapping and TTL input thresholds. The SN74HC244APW uses TSSOP-20 (SOT360-1) and CMOS inputs; direct replacement requires PCB redesign and level-shifter evaluation for VIH/VIL alignment.

What thermal derating applies to the SN74HC244APW in TSSOP-20 package?

For the SN74HC244APW in TSSOP-20 (SOT360-1), total power dissipation derates linearly at 5.5 mW/K above +60 °C. At +125 °C ambient, usable Ptot drops to ~460 mW - sufficient for full 8-bit operation at 6.0 V with typical 20 mA per output.

SN74HC244APW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74HC

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

Product Status:: Active

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:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

SN74HC244APW FAQ

1.How can I place an order for SN74HC244APW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74HC244APW 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 SN74HC244APW reliable?

The price and inventory of SN74HC244APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244APW is usually 5 days.

3.What payment methods are accepted for SN74HC244APW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244APW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74HC244APW?

SN74HC244APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74HC244APW 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 SN74HC244APW?

For technical support, including SN74HC244APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244APW requirements.

6.How does Aetrix verify that SN74HC244APW is sourced from the original manufacturer or authorized distributors?

All SN74HC244APW 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 SN74HC244APW meets industry standards.

7.What is the process for return or replacement of SN74HC244APW?

All SN74HC244APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244APW, 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 SN74HC244APW part is unused and in its original packaging.

Return procedure for SN74HC244APW:

1.Submit a request within 90 days.

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

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