SN74HCS244RKSR Equivalent & Substitute Parts

Part Overview

The SN74HCS244RKSR is a non-inverting buffer logic integrated circuit manufactured by Texas Instruments. This device functions as a 2-element, 4-bit-per-element buffer with 3-state output capability, designed for 2V to 6V supply voltage operation. The part is classified as Active product status and is available in surface mount packaging with tape and reel distribution. Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory management, or component availability across different manufacturing batches or product variants.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Input Type	Schmitt Trigger
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	20-VFQFN Exposed Pad
Supplier Device Package	20-VQFN (2.5x4.5)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74HCS244RKSR are identified based on strict electrical and mechanical parameter matching. The substitution logic is organized into two categories:

Category 1: Direct Parametric Equivalents (Identical Configuration) Parts that maintain identical logic configuration (2 elements, 4 bits per element) with all electrical parameters matching the main part. These parts differ only in manufacturing process variant or compliance certification level.

Category 2: Functional Equivalents (Different Configuration, Same Package) Parts that share the same package, supply voltage, operating temperature range, output current specifications, and 3-state output capability, but differ in element and bit-per-element configuration. These parts occupy the same physical footprint and operate within identical electrical constraints, making them suitable for applications where the specific element/bit configuration can be accommodated by circuit design.

Key Parameters Determining Substitution:

Package / Case: 20-VFQFN Exposed Pad
Supplier Device Package: 20-VQFN (2.5x4.5)
Voltage - Supply: 2V ~ 6V
Operating Temperature: -40°C ~ 125°C (TA)
Current - Output High, Low: 7.8mA, 7.8mA
Output Type: 3-State
Input Type: Schmitt Trigger
Mounting Type: Surface Mount

Parameter Comparison

Parameter	SN74HCS244RKSR	SN74HCS244QWRKSRQ1	SN74HCS541RKSR	SN74HCS541QWRKSRQ1
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	1	1
Number of Bits per Element	4	4	8	8
Input Type	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger	Schmitt Trigger
Output Type	3-State	3-State	3-State	3-State
Current - Output High, Low	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount	Surface Mount, Wettable Flank	Surface Mount	Surface Mount, Wettable Flank
Package / Case	20-VFQFN Exposed Pad	20-VFQFN Exposed Pad	20-VFQFN Exposed Pad	20-VFQFN Exposed Pad
Supplier Device Package	20-VQFN (2.5x4.5)	20-VQFN (2.5x4.5)	20-VQFN (2.5x4.5)	20-VQFN (2.5x4.5)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active
RoHS Status	Not applicable	ROHS3 Compliant	Not applicable	ROHS3 Compliant

Engineering Selection Recommendations

SN74HCS244QWRKSRQ1 is a direct parametric equivalent to the SN74HCS244RKSR with identical element and bit configuration. The primary distinction is the addition of wettable flank surface mount processing and ROHS3 compliance certification. Both parts maintain identical electrical performance and package footprint. Selection between these two parts depends on compliance requirements and manufacturing process specifications for the end application.

SN74HCS541RKSR and SN74HCS541QWRKSRQ1 are functional equivalents that differ in internal configuration (1 element with 8 bits per element versus 2 elements with 4 bits per element). These parts share identical electrical parameters, package dimensions, supply voltage range, operating temperature range, and output current specifications. The SN74HCS541 variants are suitable for applications where an 8-bit single-element buffer configuration can replace the 4-bit dual-element configuration of the SN74HCS244. The SN74HCS541QWRKSRQ1 variant includes wettable flank processing and ROHS3 compliance, while the SN74HCS541RKSR does not include these certifications.

Selection criteria are based on product status (all parts are Active), compliance certifications (ROHS3 availability), and manufacturing process variants (wettable flank availability). All substitute parts operate within identical electrical constraints and physical package specifications.

Frequently Asked Questions (FAQ)

Q: Can SN74HCS244QWRKSRQ1 be used as a direct replacement for SN74HCS244RKSR?

A: Yes. Both parts are direct parametric equivalents with identical logic configuration (2 elements, 4 bits per element), electrical specifications, and package dimensions. The SN74HCS244QWRKSRQ1 includes wettable flank surface mount processing and ROHS3 compliance certification as additional features.

Q: What is the difference between SN74HCS244 and SN74HCS541 variants?

A: The SN74HCS244 is configured as 2 elements with 4 bits per element, while the SN74HCS541 is configured as 1 element with 8 bits per element. Both share identical electrical parameters (supply voltage, operating temperature, output current) and the same 20-VQFN package footprint. The functional difference lies in the internal buffer element organization.

Q: Are all substitute parts in the same physical package?

A: Yes. All listed parts use the 20-VFQFN Exposed Pad package with dimensions of 20-VQFN (2.5x4.5mm). All parts are surface mount devices with identical footprint specifications.

Q: What does wettable flank processing mean?

A: Wettable flank is a surface mount manufacturing process variant that improves solder wetting characteristics on the package flanks. This is indicated in the mounting type specification for SN74HCS244QWRKSRQ1 and SN74HCS541QWRKSRQ1.

Q: Do all substitute parts operate at the same voltage and temperature range?

A: Yes. All parts operate at 2V to 6V supply voltage and -40°C to 125°C operating temperature range. Output current specifications are identical at 7.8mA for both high and low states.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates adherence to the Restriction of Hazardous Substances Directive. Parts marked as ROHS3 Compliant (SN74HCS244QWRKSRQ1 and SN74HCS541QWRKSRQ1) meet these environmental and material restrictions. Parts marked as "Not applicable" do not carry this certification.

Q: Can I use SN74HCS541 parts in a circuit designed for SN74HCS244?

A: Substitution depends on circuit design requirements. Both parts share identical electrical parameters and package footprint. However, the SN74HCS541 has a different internal configuration (1 element, 8 bits) compared to the SN74HCS244 (2 elements, 4 bits). Circuit design must accommodate this configuration difference.

Q: What is the Moisture Sensitivity Level (MSL) rating?

A: All listed parts have MSL rating of 1 (Unlimited), indicating unlimited shelf life without moisture control requirements during storage and handling.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message