74ACT1284MSAX Equivalent & Substitute Parts

Part Overview

The 74ACT1284MSAX 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 suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

74ACT1284MSAX

onsemiIn Stock: 79874ACT1284MSAX Datasheet

Current PartRFQ

SN74ACT1284DBR

Texas InstrumentsIn Stock: 5415SN74ACT1284DBR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT1284MSAX 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 0.209" width (5.30mm)
• Mounting Technology: Surface mount configuration
• Pin Compatibility: Identical pinout within the 20-SSOP package

The SN74ACT1284DBR from Texas Instruments meets all substitution criteria. Both parts share identical logic function, bit configuration, supply voltage specifications, and package geometry. The substitute maintains full electrical and mechanical compatibility with the original component.

Parameter Comparison

Engineering Selection Recommendations

The SN74ACT1284DBR is the qualified substitute for the obsolete 74ACT1284MSAX. Selection of this alternative is supported by:

• Functional Equivalence: Identical IEEE STD 1284 Translation Transceiver architecture and 7-bit configuration
• Electrical Compatibility: Matching supply voltage range (4.5V ~ 5.5V) and logic specifications
• Mechanical Compatibility: Identical 20-SSOP package geometry enabling direct PCB footprint compatibility
• Active Product Status: The SN74ACT1284DBR maintains active manufacturing status, ensuring long-term availability and supply chain reliability
• Regulatory Compliance: Both components share identical REACH and ECCN classifications, maintaining compliance requirements
• Moisture Sensitivity: Equivalent MSL rating (1 - Unlimited) ensures identical handling and storage requirements

The operating temperature range of the SN74ACT1284DBR (0°C ~ 70°C) is narrower than the original part (-40°C ~ 85°C). Applications requiring extended temperature operation below 0°C or above 70°C must evaluate this specification difference against system requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT1284DBR directly replace the 74ACT1284MSAX on existing PCBs?

A: Yes. Both components use identical 20-SSOP package geometry with matching pinout. Direct PCB footprint compatibility is confirmed. No layout modifications are required.

Q: What is the primary reason for substitution?

A: The 74ACT1284MSAX is classified as obsolete. The SN74ACT1284DBR provides functional and electrical equivalence with active manufacturing status.

Q: Are there differences in operating temperature specifications?

A: Yes. The 74ACT1284MSAX operates from -40°C to 85°C, while the SN74ACT1284DBR operates from 0°C to 70°C. Applications requiring operation outside the 0°C to 70°C range must verify compatibility with system thermal requirements.

Q: Do both parts have identical supply voltage requirements?

A: Yes. Both components require 4.5V to 5.5V supply voltage. No power supply modifications are necessary for substitution.

Q: Are moisture sensitivity and handling requirements the same?

A: Yes. Both parts have MSL rating of 1 (Unlimited), indicating identical moisture sensitivity levels and storage requirements.

Q: What is the packaging difference between the two parts?

A: The 74ACT1284MSAX is supplied in standard packaging, while the SN74ACT1284DBR is supplied in Tape & Reel (TR) format. Both use the same 20-SSOP package geometry. Tape & Reel format is standard for high-volume manufacturing and does not affect component functionality.

Q: Are regulatory certifications equivalent?

A: Yes. Both components share identical REACH status (REACH Unaffected) and ECCN classification (EAR99), maintaining equivalent regulatory compliance.