SN74AHCT244MDWREP Equivalent & Substitute Parts

Part Overview

The SN74AHCT244MDWREP is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments. This device functions as a 2-element, 4-bit per element buffer with 3-state output capability, designed for 4.5V to 5.5V supply voltage operation. The part is classified as Active status and is RoHS3 compliant. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility.

Substiute Parts

SN74AHCT244MDWREP

Texas InstrumentsIn Stock: 791SN74AHCT244MDWREP Datasheet

Current PartRFQ

MC74VHCT244ADWRG

onsemiIn Stock: 1685MC74VHCT244ADWRG Datasheet

DirectRFQ

74AHCT244D,118

NXP SemiconductorsIn Stock: 279574AHCT244D,118 Datasheet

MFR RecommendedRFQ

74VHCT244AM

Fairchild SemiconductorIn Stock: 225274VHCT244AM Datasheet

MFR RecommendedRFQ

74VHCT244D,118

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74AHCT244MDWREP are qualified based on the following criteria:

Electrical Compatibility: All substitute parts maintain identical logic function (non-inverting buffer), element count (2 elements), bit configuration (4 bits per element), output type (3-state), output current specifications (8mA high and low), and supply voltage range (4.5V ~ 5.5V).

Mechanical Compatibility: All substitute parts use the 20-SOIC package format with 0.295" width and 7.50mm width specification, ensuring pin-for-pin compatibility and identical PCB footprint.

Regulatory Compliance: All substitute parts maintain RoHS3 compliance and REACH unaffected status, meeting the same environmental and regulatory requirements.

Series Variations: Substitute parts include both 74AHCT series (same base series as the main part) and 74VHCT series (compatible logic family with equivalent electrical performance). The 74VHCT series represents a higher-speed variant of the 74AHCT logic family while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the SN74AHCT244MDWREP. Selection among these alternatives is based on the following factors:

Series Selection: The 74AHCT244D,118 from NXP maintains the same 74AHCT series designation as the original part and is recommended when series consistency is a design requirement. The 74VHCT series variants (MC74VHCT244ADWRG, 74VHCT244AM, 74VHCT244D,118) are compatible alternatives from the higher-speed 74VHCT logic family.

Temperature Range Consideration: The SN74AHCT244MDWREP operates across -55°C to 125°C. The MC74VHCT244ADWRG, 74AHCT244D,118, and 74VHCT244D,118 support -40°C to 125°C operation. The 74VHCT244AM operates across -40°C to 85°C and is suitable only for applications not requiring the full -55°C lower temperature limit or temperatures above 85°C.

Moisture Sensitivity: The SN74AHCT244MDWREP and 74AHCT244D,118 carry MSL rating 1 (unlimited moisture sensitivity level). The MC74VHCT244ADWRG carries MSL rating 3 (168 hours), requiring controlled storage and handling conditions.

Regulatory Compliance: All parts maintain REACH unaffected status. RoHS3 compliance is explicitly confirmed for the SN74AHCT244MDWREP and MC74VHCT244ADWRG.

Packaging Format: All substitute parts use 20-SOIC surface mount packaging with identical footprint dimensions, ensuring direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 74VHCT244 series parts directly replace the 74AHCT244 series?

A: Yes. Both series maintain identical electrical specifications for logic function, element count, bit configuration, output type, output current, and supply voltage range. The 74VHCT series represents a higher-speed variant within the same logic family and is fully compatible at the electrical and mechanical level.

Q: What is the difference between the SN74AHCT244MDWREP and the 74AHCT244D,118?

A: Both parts are 74AHCT series non-inverting buffers with identical electrical specifications. The primary differences are manufacturer (Texas Instruments vs. NXP), packaging format (Tape & Reel vs. Bulk), and operating temperature range (SN74AHCT244MDWREP: -55°C to 125°C; 74AHCT244D,118: -40°C to 125°C). The SN74AHCT244MDWREP supports extended low-temperature operation to -55°C.

Q: Is the 74VHCT244AM suitable for all applications requiring the SN74AHCT244MDWREP?

A: The 74VHCT244AM is suitable for applications operating within -40°C to 85°C temperature range. Applications requiring operation below -40°C or above 85°C must use alternative parts with extended temperature ratings.

Q: What does MSL rating 3 (168 hours) mean for the MC74VHCT244ADWRG?

A: MSL rating 3 indicates the component can be exposed to moisture for a maximum of 168 hours at 85°C and 85% relative humidity before soldering. Components with this rating require controlled storage in dry conditions and have a limited shelf life after opening the moisture barrier bag.

Q: Are all substitute parts available in the same package footprint?

A: Yes. All substitute parts use the 20-SOIC package with 0.295" width and 7.50mm width specification, providing identical PCB footprint and pin compatibility.

Q: Which substitute part is recommended as the primary alternative?

A: The 74AHCT244D,118 from NXP is recommended as the primary alternative, maintaining the same 74AHCT series designation, MSL rating 1 (unlimited), and operating temperature range of -40°C to 125°C, with the exception of the extended -55°C lower limit of the original part.