74F244SJX Equivalent & Substitute Parts

Part Overview

The 74F244SJX is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component operates within the 4.5V to 5.5V supply voltage range and is designed for surface mount applications in the 20-SOP package.

The 74F244SJX carries an obsolete product status. Locating equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems utilizing this component.

Key Parameters

Parameter	Specification
Manufacturer Part Number	74F244SJX
Manufacturer	onsemi
Series	74F
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74F244SJX is determined by the following critical parameters:

Logic Function: Buffer, Non-Inverting configuration with 2 elements and 4 bits per element
Output Architecture: 3-State output capability
Electrical Specifications: Supply voltage range 4.5V ~ 5.5V and operating temperature 0°C ~ 70°C
Mounting and Package: Surface mount technology with compatible 20-pin SOIC package footprint

Substitute parts must maintain identical logic function, output type, and electrical operating parameters. Package variations within the 20-pin SOIC family are permissible when physical dimensions remain compatible with the PCB layout.

Parameter Comparison

Parameter	74F244SJX (onsemi)	SN74F244NSR (TI)	SN74F244DW (TI)	SN74F244DWR (TI)
Series	74F	74F	74F	74F
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 (mA)	3	15	15	15
Current - Output Low (mA)	64	64	64	64
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SOIC (0.209", 5.30mm)	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74F244NSR (Texas Instruments) is the primary direct substitute. This part maintains identical electrical specifications and operates within the same supply voltage and temperature ranges. The SN74F244NSR carries active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The 20-SOIC (0.209", 5.30mm) package matches the original footprint precisely.

SN74F244DWR (Texas Instruments) is an active substitute with equivalent electrical performance. This part features a wider 20-SOIC package (0.295", 7.50mm) and requires PCB layout verification to confirm physical compatibility. Active product status supports sustained supply chain access.

SN74F244DW (Texas Instruments) functions as a substitute with identical electrical specifications but carries last-time-buy status. The wider package footprint (0.295", 7.50mm) necessitates layout compatibility assessment. This option is suitable for applications where immediate availability is prioritized over long-term supply assurance.

All three substitute parts are manufactured by Texas Instruments and maintain the 74F logic series designation, ensuring functional equivalence with the obsolete 74F244SJX.

Frequently Asked Questions (FAQ)

Q: Can SN74F244DW and SN74F244DWR be used interchangeably with 74F244SJX?

A: Both parts provide functional equivalence in terms of logic operation, output type, and electrical specifications. However, the package footprint differs. SN74F244DW and SN74F244DWR use a 20-SOIC package with 0.295" width, compared to the 74F244SJX at 0.209" width. PCB layout compatibility must be verified before substitution.

Q: What is the significance of the output current difference between 74F244SJX and the Texas Instruments substitutes?

A: The 74F244SJX specifies 3mA output high current, while SN74F244NSR, SN74F244DW, and SN74F244DWR specify 15mA. This difference indicates the Texas Instruments parts can source higher current at the output. Circuit designs relying on the lower current specification of the original part should be reviewed to ensure the higher current capability does not introduce signal integrity issues.

Q: Why is SN74F244NSR recommended as the primary substitute?

A: SN74F244NSR maintains the identical 20-SOIC (0.209", 5.30mm) package footprint as the 74F244SJX, eliminating PCB layout concerns. It carries active product status, ensuring sustained availability. ROHS3 compliance supports regulatory requirements for new designs and production.

Q: Are there package considerations when selecting between the three substitutes?

A: Yes. SN74F244NSR uses the narrow

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