74ACT1284MSA Equivalent & Substitute Parts

Part Overview

The 74ACT1284MSA is an IEEE STD 1284 Translation Transceiver IC manufactured by onsemi in a 20-SSOP surface mount package. This component functions as a 7-bit bus interface transceiver for parallel port communication applications. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

74ACT1284MSA

onsemiIn Stock: 90974ACT1284MSA Datasheet

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SN74ACT1284DBR

Texas InstrumentsIn Stock: 5415SN74ACT1284DBR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT1284MSA is determined by the following critical parameters:

• Logic Function: IEEE STD 1284 Translation Transceiver architecture
• Bit Configuration: 7-bit bus interface
• Supply Voltage Range: 4.5V ~ 5.5V compatibility
• Package Type: 20-SSOP form factor with identical 0.209" (5.30mm) width
• Mounting Technology: Surface mount configuration
• Pin Count and Pinout: 20-pin SSOP package

The SN74ACT1284DBR from Texas Instruments satisfies all primary substitution criteria. Both components share identical logic function, bit configuration, supply voltage specifications, and physical package dimensions. The substitute maintains full electrical and mechanical compatibility for direct replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74ACT1284DBR is the qualified substitute for the obsolete 74ACT1284MSA. Selection is based on the following factors:

Functional Equivalence: Both components implement identical IEEE STD 1284 Translation Transceiver logic with 7-bit bus interface capability.

Electrical Compatibility: Supply voltage range (4.5V ~ 5.5V) and pin configuration are identical, ensuring direct circuit compatibility without modification.

Package Compatibility: Both components utilize the 20-SSOP package with matching physical dimensions, enabling direct PCB footprint compatibility.

Product Status: The SN74ACT1284DBR maintains active production status with established supply chain availability, addressing the obsolescence of the original onsemi component.

Compliance: The Texas Instruments substitute carries ROHS3 compliance certification, meeting current regulatory requirements for new designs and manufacturing operations.

Temperature Consideration: The substitute operates within 0°C ~ 70°C, which is narrower than the original -40°C ~ 85°C range. Verify this temperature range meets application requirements before implementation.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT1284DBR directly replace the 74ACT1284MSA without PCB modifications?

A: Yes. Both components share identical 20-SSOP package dimensions, pinout configuration, and electrical specifications. Direct PCB footprint compatibility is confirmed.

Q: What is the primary reason for substitution?

A: The 74ACT1284MSA is classified as obsolete. The SN74ACT1284DBR provides functional and electrical equivalence with active production status and established supply availability.

Q: Are there differences in operating temperature ranges?

A: Yes. The 74ACT1284MSA operates from -40°C ~ 85°C, while the SN74ACT1284DBR operates from 0°C ~ 70°C. Applications requiring extended low-temperature operation below 0°C must verify compatibility with the substitute's temperature specification.

Q: What packaging formats are available for the substitute?

A: The SN74ACT1284DBR is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. The original 74ACT1284MSA was supplied in standard packaging.

Q: Is the substitute RoHS compliant?

A: Yes. The SN74ACT1284DBR is ROHS3 compliant, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: Are both components moisture sensitive?

A: Both components carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.