SN74ALS653NT Equivalent & Substitute Parts

Part Overview

The SN74ALS653NT is a 24-pin DIP inverting transceiver IC manufactured by Texas Instruments, designed for 8-bit data bus applications with open collector and push-pull output configurations. This component operates within a 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

SN74ALS653NT

Texas InstrumentsIn Stock: 1092SN74ALS653NT Datasheet

Current PartRFQ

SN74ALS653DWR

Texas InstrumentsIn Stock: 862SN74ALS653DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS653NT is determined by strict equivalence across the following electrical and mechanical parameters:

• Base product number (74ALS653) ensures identical logic function and pin configuration
• Logic type (Transceiver, Inverting) and bit configuration (1 Element, 8 Bit per Element) must remain constant
• Output type (Open Collector, Push-Pull) must be preserved for circuit compatibility
• Current ratings (15mA, 24mA) must match output specifications
• Supply voltage range (4.5V ~ 5.5V) and operating temperature (0°C ~ 70°C) must be identical
• RoHS3 compliance and REACH unaffected status must be maintained

The primary distinction between the main part and substitute is the mounting technology and package form factor: the SN74ALS653NT uses through-hole 24-DIP packaging, while the SN74ALS653DWR uses surface-mount 24-SOIC packaging. Both maintain identical electrical specifications and functional characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS653DWR serves as the manufacturer-recommended substitute for the obsolete SN74ALS653NT. Both parts maintain identical electrical specifications, functional characteristics, and regulatory compliance status (ROHS3 Compliant, REACH Unaffected). The substitute part carries active product status, ensuring continued availability and manufacturing support.

Selection between these parts depends on board-level design requirements. The SN74ALS653NT (24-DIP through-hole) is suitable for through-hole assembly processes and legacy board designs. The SN74ALS653DWR (24-SOIC surface-mount) is appropriate for surface-mount assembly processes and modern PCB layouts. Both parts are electrically interchangeable when their respective mounting technologies are accommodated in the circuit board design.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS653DWR directly replace the SN74ALS653NT in an existing circuit?

A: Electrical substitution is complete. However, the mounting technology differs: SN74ALS653NT uses through-hole DIP packaging while SN74ALS653DWR uses surface-mount SOIC packaging. Direct socket replacement requires compatible board-level footprints and assembly processes.

Q: Are the pin configurations identical between these parts?

A: Both parts use 24-pin configurations with identical pin assignments for the 74ALS653 base product number. Pin-to-pin compatibility is maintained.

Q: What is the significance of the obsolete status for SN74ALS653NT?

A: Obsolete status indicates Texas Instruments has discontinued manufacturing. The SN74ALS653DWR, with active product status, represents the current manufacturing alternative and ensures long-term supply chain availability.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both parts are ROHS3 Compliant and REACH Unaffected, maintaining identical regulatory compliance across all specified standards.

Q: What are the package dimension differences?

A: SN74ALS653NT (24-DIP) measures 0.300" width with 7.62mm pitch. SN74ALS653DWR (24-SOIC) measures 0.295" width with 7.50mm pitch. These are distinct package families requiring different PCB footprints.