74F244SC Equivalent & Substitute Parts

Part Overview

The 74F244SC is a non-inverting buffer IC manufactured by onsemi, designed for logic signal buffering applications. This device features 2 elements with 4 bits per element and 3-state output capability, housed in a 20-SOIC package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-SOIC
Mounting Type	Surface Mount
Current - Output High, Low	3mA, 64mA

Substitute Part Grouping Explanation

Substitution eligibility for the 74F244SC is determined by the following critical parameters:

Logic Function: Buffer, Non-Inverting with identical element and bit configuration (2 elements, 4 bits per element)
Output Configuration: 3-State output capability
Electrical Specifications: Voltage supply range 4.5V ~ 5.5V and operating temperature 0°C ~ 70°C
Package Compatibility: 20-SOIC or 20-SO surface mount packages
Series Classification: 74F logic family

Substitute parts are grouped into two categories:

Direct Substitutes (identical package and electrical characteristics):

SN74F244DW (Texas Instruments)
SN74F244DWR (Texas Instruments)

Similar Substitutes (functionally equivalent with package variation):

SN74F244NSR (Texas Instruments) — 20-SO package (5.30mm width vs. 7.50mm width)

Parameter Comparison

Parameter	74F244SC (onsemi)	SN74F244DW (TI)	SN74F244DWR (TI)	SN74F244NSR (TI)
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
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	20-SOIC (7.50mm)	20-SOIC (7.50mm)	20-SOIC (7.50mm)	20-SO (5.30mm)
Current - Output High, Low	3mA, 64mA	15mA, 64mA	15mA, 64mA	15mA, 64mA
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Last Time Buy	Active	Active

Engineering Selection Recommendations

SN74F244DWR (Texas Instruments) is the primary recommended substitute. This part is in active production status, ROHS3 compliant, and maintains identical package dimensions (20-SOIC, 7.50mm width) to the original 74F244SC. The output high current specification (15mA vs. 3mA) represents an improvement in drive capability. Current inventory availability is 7783 pieces.

SN74F244DW (Texas Instruments) serves as an alternative direct substitute with identical electrical and package specifications. This part carries Last Time Buy status, indicating limited future availability. Current inventory is 2700 pieces.

SN74F244NSR (Texas Instruments) is functionally equivalent but uses a narrower 20-SO package (5.30mm width vs. 7.50mm width). This substitution requires PCB layout verification to confirm package footprint compatibility. The part is in active production with ROHS3 compliance and 2120 pieces in stock.

Frequently Asked Questions (FAQ)

Q: Can SN74F244DWR directly replace 74F244SC without PCB modifications?

A: Yes. SN74F244DWR maintains identical package dimensions (20-SOIC, 7.50mm width), pin configuration, and electrical operating parameters. No PCB layout changes are required.

Q: What is the significance of the output high current difference (3mA vs. 15mA)?

A: The substitute parts deliver higher output high current (15mA), which provides greater drive capability and improved noise margin. This is functionally compatible with designs expecting 3mA output, as it represents enhanced performance rather than reduced capability.

Q: Is SN74F244NSR compatible with existing PCB designs?

A: SN74F244NSR uses a narrower 20-SO package (5.30mm width) compared to the original 20-SOIC package (7.50mm width). PCB footprint compatibility must be verified before substitution. Pin configuration and electrical specifications remain identical.

Q: Why is 74F244SC listed as obsolete?

A: The onsemi 74F244SC has reached end-of-life status. Texas Instruments continues production of functionally equivalent 74F244 variants, making these parts suitable for design continuity and production support.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitute parts (SN74F244DW, SN74F244DWR, SN74F244NSR) are ROHS3 compliant. The original 74F244SC RoHS status was not specified in available documentation.

Q: Which substitute offers the best long-term availability?

A: SN74F244DWR is recommended for long-term designs. This part maintains active production status, ensuring continued availability and supply chain stability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message