SN74ALS646ANT Equivalent & Substitute Parts

Part Overview

The SN74ALS646ANT is a non-inverting transceiver IC manufactured by Texas Instruments, designed for 8-bit data transmission with 3-state output capability. This device operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-pin DIP package for through-hole mounting applications.

The SN74ALS646ANT is classified as obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, and system upgrades where through-hole or surface-mount alternatives are preferred.

Substiute Parts

SN74ALS646ANT

Texas InstrumentsIn Stock: 2198SN74ALS646ANT Datasheet

Current PartRFQ

SN74ALS646ADWR

Texas InstrumentsIn Stock: 777SN74ALS646ADWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS646ANT is determined by the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 15mA, 24mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)
• Base Product Number: 74ALS646

The SN74ALS646ADWR is functionally equivalent to the SN74ALS646ANT. Both devices share identical electrical specifications and logic functionality. The primary difference is packaging: the SN74ALS646ANT uses through-hole 24-DIP mounting, while the SN74ALS646ADWR uses surface-mount 24-SOIC packaging. The SN74ALS646ADWR is currently in active production status, making it the recommended substitute for new designs and production applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS646ADWR is the direct functional equivalent of the SN74ALS646ANT. Both devices meet ROHS3 compliance and carry unlimited moisture sensitivity ratings, ensuring compatibility with modern manufacturing and environmental standards.

Selection between these parts depends on board design requirements:

• For through-hole PCB designs or legacy system repairs, the SN74ALS646ANT remains available in existing inventory.
• For new designs, production continuity, and surface-mount applications, the SN74ALS646ADWR is the appropriate choice due to its active product status and modern packaging format.

Both parts are manufactured by Texas Instruments and share identical electrical performance characteristics, ensuring functional interchangeability within their respective mounting technologies.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS646ADWR directly replace the SN74ALS646ANT in an existing through-hole design?

A: Electrically, yes. Both devices are functionally identical with matching logic specifications, output current ratings, and supply voltage requirements. However, the SN74ALS646ADWR uses surface-mount 24-SOIC packaging, requiring PCB redesign and different assembly processes compared to the through-hole 24-DIP format of the SN74ALS646ANT.

Q: What is the primary difference between these two parts?

A: The SN74ALS646ANT and SN74ALS646ADWR differ only in packaging and mounting technology. The SN74ALS646ANT uses through-hole 24-DIP mounting, while the SN74ALS646ADWR uses surface-mount 24-SOIC packaging. All electrical parameters and logic functionality are identical.

Q: Why is the SN74ALS646ANT classified as obsolete?

A: The SN74ALS646ANT is an older through-hole component. Texas Instruments has transitioned this product line to surface-mount packaging (SN74ALS646ADWR), which is now in active production status.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74ALS646ANT and SN74ALS646ADWR are ROHS3 compliant and carry unlimited moisture sensitivity ratings (MSL 1).

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by: logic type (non-inverting transceiver), element count (1), bit width (8 bits per element), output type (3-state), output current ratings (15mA high, 24mA low), supply voltage range (4.5V to 5.5V), and operating temperature range (0°C to 70°C).