SN74AC244DW Equivalent & Substitute Parts

Part Overview

The SN74AC244DW 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 and substitute parts necessary for ongoing design requirements and production needs. The 74AC244 series provides buffering functionality across the 2V to 6V supply voltage range with consistent output drive capability of 24mA for both high and low states.

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	24mA, 24mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN74AC244DW is determined by strict equivalence across the following parameters: logic type (non-inverting buffer), element count (2), bits per element (4), output type (3-state), output current specifications (24mA high and low), supply voltage range (2V to 6V), operating temperature range (-40°C to 85°C), and package type (20-SOIC surface mount). All substitute parts listed maintain identical electrical and mechanical specifications. Packaging format variations (tube, cut tape, digi-reel) do not affect functional equivalence but may impact procurement and handling requirements.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status	RoHS
SN74AC244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Discontinued	ROHS3
SN74AC244DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3
74AC244SC	Fairchild Semiconductor	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	Not specified
74AC244SCX	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3
MC74AC244DWR2G	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3
MC74AC244DWG	onsemi	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Active	ROHS3
SN74AC241DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24/24	2V ~ 6V	-40°C ~ 85°C	20-SOIC	Last Time Buy	ROHS3

Engineering Selection Recommendations

SN74AC244DWR is the direct equivalent from Texas Instruments with active product status and identical specifications to the discontinued SN74AC244DW. This part is recommended as the primary replacement when sourcing from the original manufacturer.

74AC244SCX from onsemi offers the highest current inventory (18,995 pcs) with active status and ROHS3 compliance, making it suitable for high-volume production requirements.

MC74AC244DWR2G and MC74AC244DWG from onsemi are manufacturer-recommended alternatives with active status and full ROHS3 compliance. Both maintain identical electrical parameters and 20-SOIC packaging.

74AC244SC from Fairchild Semiconductor is functionally equivalent with active status but lacks specified RoHS certification documentation.

SN74AC241DW from Texas Instruments is a parametric equivalent with identical electrical specifications but carries Last Time Buy status, limiting its suitability for new designs requiring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can SN74AC244DWR be used as a direct replacement for SN74AC244DW?

A: Yes. SN74AC244DWR is functionally and electrically identical to SN74AC244DW. Both are Texas Instruments products with matching logic type, element count, bit configuration, output type, current ratings, supply voltage range, operating temperature, and 20-SOIC package. The primary difference is product status: SN74AC244DWR is active while SN74AC244DW is discontinued.

Q: What is the difference between tube and cut tape packaging for these parts?

A: Tube and cut tape are packaging and delivery formats that do not affect electrical or functional performance. Tube packaging (SN74AC244DW, MC74AC244DWG) is typically used for lower-volume orders, while cut tape and digi-reel formats (SN74AC244DWR, 74AC244SCX, MC74AC244DWR2G) are optimized for automated assembly and higher-volume production. Selection depends on procurement and manufacturing process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: SN74AC244DWR, 74AC244SCX, MC74AC244DWR2G, and MC74AC244DWG are all ROHS3 compliant. 74AC244SC does not have specified RoHS certification in the provided data. SN74AC241DW is ROHS3 compliant but carries Last Time Buy status.

Q: Why is SN74AC241DW listed as a parametric equivalent rather than a direct substitute?

A: SN74AC241DW maintains identical electrical and mechanical specifications to SN74AC244DW but carries Last Time Buy status from Texas Instruments, indicating limited future availability. While functionally equivalent, it is not recommended for new designs requiring sustained component supply.

Q: What determines whether a part can substitute for SN74AC244DW?

A: Substitution is determined by exact equivalence across logic type (non-inverting buffer), element count (2), bits per element (4), output type (3-state), output current (24mA high and low), supply voltage range (2V to 6V), operating temperature range (-40°C to 85°C), and package type (20-SOIC surface mount). All listed parts meet these criteria.

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