SN74AHCT244DW Equivalent & Substitute Parts

Part Overview

The SN74AHCT244DW is a non-inverting buffer logic IC manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-SOIC surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The 74AHCT244 series provides standard logic buffering functionality with 5.5V supply voltage tolerance and industrial temperature range operation.

Substiute Parts

SN74AHCT244DW

Texas InstrumentsIn Stock: 2333SN74AHCT244DW Datasheet

Current PartRFQ

SN74AHCT244DWR

Texas InstrumentsIn Stock: 2889SN74AHCT244DWR Datasheet

DirectRFQ

74VHCT244AM

Fairchild SemiconductorIn Stock: 225274VHCT244AM Datasheet

DirectRFQ

MC74VHCT244ADWRG

onsemiIn Stock: 1685MC74VHCT244ADWRG Datasheet

DirectRFQ

74AHCT244D,118

NXP SemiconductorsIn Stock: 279574AHCT244D,118 Datasheet

UpgradeRFQ

74AHCT244D-Q100,11

Nexperia USA Inc.In Stock: 505774AHCT244D-Q100,11 Datasheet

UpgradeRFQ

74VHCT244D,118

NXP USA Inc.In Stock: 303574VHCT244D,118 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74AHCT244DW is determined by strict equivalence across the following critical parameters:

• Logic Type: Buffer, Non-Inverting
• Number of Elements: 2
• Number of Bits per Element: 4
• Output Type: 3-State
• Current - Output High, Low: 8mA, 8mA
• Voltage - Supply: 4.5V ~ 5.5V
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical and mechanical specifications with the same base product number (74AHCT244) or compatible series (74VHCT244), differing only in packaging format or manufacturer.

Upgrade Variants utilize alternative base product numbers (74AHCT244 or 74VHCT244) with compatible electrical characteristics but may include enhanced qualifications such as automotive-grade certification (AEC-Q100).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for Direct Replacement): SN74AHCT244DWR from Texas Instruments maintains identical specifications to the original SN74AHCT244DW with active product status and ROHS3 compliance. This part is the preferred choice for applications requiring continuity with the original design.

Alternative Substitutes with Active Status: MC74VHCT244ADWRG from onsemi provides full electrical compatibility with extended operating temperature range (-40°C ~ 125°C) and ROHS3 compliance. The 74AHCT244D,118 from NXP Semiconductors and 74AHCT244D-Q100,11 from Nexperia USA Inc. offer active product status with automotive-grade qualification (AEC-Q100) for applications requiring enhanced reliability certification.

Series Compatibility: 74VHCT244 series parts (74VHCT244AM, 74VHCT244D,118) maintain full electrical equivalence with identical output current and supply voltage specifications. The 74VHCT244AM operates within a reduced temperature range (-40°C ~ 85°C) and should be evaluated for applications requiring the full -40°C ~ 125°C range.

Package Consideration: All substitute parts maintain the 20-SOIC package footprint except 74AHCT244D,118, 74AHCT244D-Q100,11, and 74VHCT244D,118, which use 20-SO packaging. These variants are mechanically compatible with standard 20-SOIC PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can I use 74VHCT244 series parts as direct replacements for 74AHCT244?

A: Yes. The 74VHCT244 series maintains identical electrical specifications including logic type, element count, bit configuration, output type, current ratings, and supply voltage range. Both series are functionally interchangeable in applications operating within the specified temperature range.

Q: What is the difference between SN74AHCT244DW and SN74AHCT244DWR?

A: Both parts are manufactured by Texas Instruments with identical electrical and mechanical specifications. The primary difference is packaging format: SN74AHCT244DW is supplied in Tube packaging, while SN74AHCT244DWR is supplied in Cut Tape (CT) & Digi-Reel format. SN74AHCT244DWR has active product status.

Q: Are the 20-SO and 20-SOIC packages interchangeable?

A: The 20-SO and 20-SOIC packages share identical pin configurations and footprints, making them mechanically and electrically interchangeable on standard PCB layouts. Both packages accommodate the same 0.295" (7.50mm) width specification.

Q: Does the 74AHCT244D-Q100,11 automotive qualification affect circuit performance?

A: No. The AEC-Q100 automotive qualification indicates enhanced reliability testing and qualification standards but does not alter electrical performance. The part maintains identical voltage, current, and temperature specifications as non-automotive variants.

Q: Which substitute part has the longest available operating temperature range?

A: SN74AHCT244DWR, MC74VHCT244ADWRG, 74AHCT244D,118, 74AHCT244D-Q100,11, and 74VHCT244D,118 all operate across the full -40°C ~ 125°C temperature range. The 74VHCT244AM is limited to -40°C ~ 85°C and should not be used in applications requiring operation above 85°C.

Q: Are all substitute parts ROHS3 compliant?

A: SN74AHCT244DWR, MC74VHCT244ADWRG, 74AHCT244D-Q100,11, and the original SN74AHCT244DW are ROHS3 compliant. Compliance status for 74VHCT244AM, 74AHCT244D,118, and 74VHCT244D,118 is not specified in the provided data.