SN74ALS244CDW Equivalent & Substitute Parts

Part Overview

The SN74ALS244CDW is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments, designed for 2 element, 4-bit per element configurations with 3-state output capability. This device operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The SN74ALS244CDW carries a Last Time Buy product status, indicating discontinued production. Identifying equivalent and substitute parts is essential for ongoing system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	SN74ALS244CDW
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	15mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74ALS244CDW 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: 15mA, 24mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: 0°C ~ 70°C (TA)
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

All identified substitute parts maintain identical electrical and mechanical specifications across these parameters. Packaging format variations (Tube versus Cut Tape & Digi-Reel) do not affect functional compatibility but may influence procurement and handling procedures.

Parameter Comparison

Parameter	SN74ALS244CDW	SN74ALS244CDWR	SN74ALS241CDW	SN74ALS244C-1DW
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2
Number of Bits per Element	4	4	4	4
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	15mA, 24mA	15mA, 24mA	15mA, 24mA	15mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Last Time Buy	Active	Last Time Buy	Last Time Buy
Packaging Format	Tube	Cut Tape & Digi-Reel	Tube	Tube

Engineering Selection Recommendations

For applications requiring the SN74ALS244CDW, the SN74ALS244CDWR is the primary recommended substitute due to its Active product status, ensuring long-term availability and continued manufacturing support. This variant maintains identical electrical and mechanical specifications while offering Cut Tape & Digi-Reel packaging, which accommodates both manual and automated assembly workflows.

The SN74ALS241CDW and SN74ALS244C-1DW are parametric equivalents with Last Time Buy status, suitable for applications where inventory procurement is not time-sensitive. These alternatives provide functional compatibility but carry the same supply discontinuation risk as the original SN74ALS244CDW.

All substitute parts comply with ROHS3 and REACH requirements, maintaining regulatory alignment across replacement scenarios.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS244CDWR be used as a direct replacement for SN74ALS244CDW?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters: logic type, element count, bit configuration, output type, current ratings, supply voltage, operating temperature, and 20-SOIC package specification. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and product status (Active versus Last Time Buy).

Q: What is the difference between SN74ALS244CDW and SN74ALS241CDW?

A: Both parts share identical electrical specifications and 20-SOIC packaging. The difference lies in the base product number designation (74ALS244 versus 74ALS241), which reflects internal design variants. Both are functionally equivalent for non-inverting buffer applications with 2 elements and 4 bits per element.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist when substituting between listed equivalents. All parts maintain identical voltage supply ranges (4.5V ~ 5.5V), operating temperature ranges (0°C ~ 70°C), output current specifications (15mA high, 24mA low), and 20-SOIC surface mount packaging. PCB layout and schematic integration remain unchanged.

Q: Does packaging format affect functional performance?

A: Packaging format (Tube, Cut Tape, or Digi-Reel) does not affect functional performance. These formats address procurement and assembly logistics only. Tube packaging suits manual assembly and lower-volume applications, while Cut Tape & Digi-Reel packaging accommodates automated pick-and-place equipment for higher-volume production.

Q: What is the significance of Last Time Buy status?

A: Last Time Buy status indicates that the manufacturer has discontinued production and will not accept new orders beyond a specified cutoff date. For SN74ALS244CDW, SN74ALS241CDW, and SN74ALS244C-1DW, this status necessitates transition planning. The SN74ALS244CDWR, with Active status, provides continuity for ongoing procurement requirements.

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