SN74ALS244CDB Equivalent & Substitute Parts

Part Overview

The SN74ALS244CDB 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 component operates within the 74ALS logic series and is housed in a 20-SSOP surface mount package.

The SN74ALS244CDB carries a Last Time Buy product status, indicating that Texas Instruments has discontinued active production and sales of this specific part number. This status necessitates identification of equivalent substitute components to maintain design continuity and ensure ongoing component availability for production and maintenance applications.

Substiute Parts

SN74ALS244CDB

Texas InstrumentsIn Stock: 2802SN74ALS244CDB Datasheet

Current PartRFQ

SN74ALS244CDBR

Texas InstrumentsIn Stock: 2416SN74ALS244CDBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS244CDB is determined by strict equivalence across the following critical parameters:

Functional Parameters:

• Logic type: Buffer, Non-Inverting
• Number of elements: 2
• Number of bits per element: 4
• Output configuration: 3-State

Electrical Parameters:

• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C (TA)
• Output current specifications (High and Low)

Physical Parameters:

• Package type: 20-SSOP
• Package dimensions: 0.209" width, 5.30mm width
• Mounting type: Surface Mount

Compliance Parameters:

• RoHS3 compliance requirement
• Moisture Sensitivity Level: 1 (Unlimited)

The SN74ALS244CDBR qualifies as a direct substitute based on matching all functional, electrical, physical, and compliance parameters. The primary distinction is product status: the substitute part maintains Active status, ensuring continued availability and manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS244CDBR is the direct substitute for the SN74ALS244CDB. Selection of the substitute part is based on the following engineering criteria:

Product Status Consideration: The SN74ALS244CDB maintains Last Time Buy status, indicating end-of-life production. The SN74ALS244CDBR carries Active status, ensuring continued manufacturing availability and supply chain reliability for current and future production requirements.

Compliance Alignment: Both parts maintain ROHS3 compliance and identical Moisture Sensitivity Level (MSL) ratings, satisfying regulatory and environmental requirements without modification to assembly or storage procedures.

Functional and Electrical Equivalence: The substitute part maintains identical logic functionality, element configuration, bit-per-element specification, and 3-state output characteristics. Supply voltage range and operating temperature specifications are identical, ensuring direct functional replacement in existing circuit designs.

Physical Compatibility: Both parts utilize the 20-SSOP surface mount package with identical dimensions, enabling direct substitution on existing printed circuit board layouts without design modification or re-qualification of assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS244CDBR be used as a direct replacement for the SN74ALS244CDB in existing designs?

A: Yes. The SN74ALS244CDBR is functionally and electrically equivalent to the SN74ALS244CDB across all critical parameters: logic type, element configuration, bit-per-element specification, output type, supply voltage range, operating temperature range, package type, and compliance certifications. Direct substitution is supported without circuit design modification.

Q: What is the difference between the SN74ALS244CDB and SN74ALS244CDBR?

A: The primary difference is product status. The SN74ALS244CDB is Last Time Buy (discontinued), while the SN74ALS244CDBR is Active (currently manufactured). Additionally, the output low current specification differs: SN74ALS244CDB specifies 48mA, while SN74ALS244CDBR specifies 24mA. Both parts share identical package, voltage, temperature, and compliance specifications.

Q: Are there packaging differences between these part numbers?

A: No. Both the SN74ALS244CDB and SN74ALS244CDBR are supplied in the 20-SSOP surface mount package with identical dimensions (0.209" width, 5.30mm width). The SN74ALS244CDBR is available in Cut Tape (CT) and Digi-Reel® packaging formats, while the SN74ALS244CDB is listed as prototype packaging.

Q: Do these parts require different handling or storage procedures?

A: No. Both parts carry identical Moisture Sensitivity Level (MSL) ratings of 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures for surface mount components apply to both parts without differentiation.

Q: Is the SN74ALS244CDBR compliant with current environmental regulations?

A: Yes. The SN74ALS244CDBR maintains ROHS3 compliance, meeting current environmental and regulatory requirements for electronic component manufacturing and use.