SN74HCT244PWT Equivalent & Substitute Parts

Part Overview

The SN74HCT244PWT is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments, featuring 2 elements with 4 bits per element and 3-state output capability. The device operates across a 4.5V to 5.5V supply voltage range and is housed in a 20-TSSOP surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	6mA, 6mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HCT244PWT is determined by strict equivalence across the following critical parameters: logic type (non-inverting buffer), element and bit configuration (2 elements, 4 bits per element), output type (3-state), supply voltage range (4.5V ~ 5.5V), package type (20-TSSOP), and mounting method (surface mount). All substitute parts listed maintain these core specifications. Variations in output current capability (6mA to 7.2mA), operating temperature range extensions, and manufacturer differences are noted but do not prevent functional substitution within the specified electrical envelope. Packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Discontinued) are secondary considerations that affect procurement and availability rather than electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Output Current (mA)	Operating Temp (°C)	Package	Packaging Format
SN74HCT244PWT	Texas Instruments	Discontinued	Buffer, Non-Inverting	6, 6	-40 ~ 85	20-TSSOP	Cut Tape (CT) & Digi-Reel®
SN74HCT244PWR	Texas Instruments	Active	Buffer, Non-Inverting	6, 6	-40 ~ 85	20-TSSOP	Cut Tape (CT) & Digi-Reel®
MC74HCT244ADTR2G	onsemi	Active	Buffer, Non-Inverting	6, 6	-55 ~ 125	20-TSSOP	Tape & Reel (TR)
74HCT244PW,118	Nexperia USA Inc.	Active	Buffer, Non-Inverting	6, 6	-40 ~ 125	20-TSSOP	Tape & Reel (TR)
74HCT244PW-Q100,11	Nexperia USA Inc.	Active	Buffer, Non-Inverting	6, 6	-40 ~ 125	20-TSSOP	Tape & Reel (TR)
MM74HCT244MTCX	onsemi	Active	Buffer, Non-Inverting	7.2, 7.2	-40 ~ 85	20-TSSOP	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

For direct replacement of the discontinued SN74HCT244PWT, the SN74HCT244PWR from Texas Instruments is the primary equivalent, maintaining identical electrical specifications and packaging format while offering active product status and higher inventory availability (16,397 units in stock).

The MC74HCT244ADTR2G from onsemi provides an alternative with extended operating temperature range (-55°C to 125°C) and active status, suitable for applications requiring wider temperature performance. This part features slightly elevated output current (7.2mA vs. 6mA) and is supplied in Tape & Reel format.

The 74HCT244PW,118 and 74HCT244PW-Q100,11 from Nexperia USA Inc. are manufacturer-recommended alternatives with active product status and extended upper operating temperature limit (125°C). The 74HCT244PW-Q100,11 variant includes AEC-Q100 automotive qualification, making it suitable for automotive-grade applications.

The MM74HCT244MTCX from onsemi is a manufacturer-recommended option with active status and Cut Tape packaging similar to the original part, though with marginally higher output current specification.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical functional architecture, ensuring seamless integration into existing designs.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT244PWR be used as a direct replacement for SN74HCT244PWT?

A: Yes. Both parts are manufactured by Texas Instruments and share identical electrical specifications, output current ratings (6mA), operating temperature range (-40°C to 85°C), and 20-TSSOP package configuration. The primary difference is product status: SN74HCT244PWR is active with higher inventory availability.

Q: What is the difference between Cut Tape and Tape & Reel packaging formats?

A: Cut Tape (CT) & Digi-Reel® format is supplied on individual tape segments suitable for smaller quantities and manual handling. Tape & Reel (TR) format provides continuous reel packaging optimized for automated assembly processes and larger production volumes. Both formats contain identical components; the difference is procurement and handling methodology.

Q: Can the MC74HCT244ADTR2G be substituted if my application requires operation below -40°C?

A: Yes. The MC74HCT244ADTR2G extends the lower operating temperature limit to -55°C, making it suitable for applications requiring sub-zero operation. All other electrical parameters remain compatible with the original SN74HCT244PWT specification.

Q: What does AEC-Q100 qualification on the 74HCT244PW-Q100,11 indicate?

A: AEC-Q100 is an automotive industry qualification standard. The 74HCT244PW-Q100,11 meets automotive-grade reliability and testing requirements, making it suitable for automotive applications where component qualification is mandated.

Q: Are there any output current differences between substitute parts?

A: Most substitutes maintain the 6mA output current specification. The MM74HCT244MTCX features 7.2mA output current, which is higher but remains within acceptable operating margins for standard 74HCT logic applications. This increased current capability does not prevent substitution and may provide improved drive capability in certain circuit configurations.

Q: Do all substitute parts maintain the same supply voltage range?

A: Yes. All listed substitute parts operate across the 4.5V to 5.5V supply voltage range, ensuring compatibility with standard TTL and CMOS logic supply rails.

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