74ACT1284SCX Equivalent & Substitute Parts

Part Overview

The 74ACT1284SCX is an IEEE STD 1284 Translation Transceiver IC manufactured by onsemi, designed for parallel port communication and bus interface applications. This component operates as a 7-bit bidirectional transceiver with three-state output capability in a 20-SOIC surface mount package. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

74ACT1284SCX

onsemiIn Stock: 390874ACT1284SCX Datasheet

Current PartRFQ

SN74ACT1284DWR

Texas InstrumentsIn Stock: 3267SN74ACT1284DWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT1284SCX is determined by strict alignment of the following critical parameters:

• Logic Type: IEEE STD 1284 Translation Transceiver functionality
• Number of Bits: 7-bit configuration
• Supply Voltage: 4.5V ~ 5.5V operating range
• Package / Case: 20-SOIC form factor with identical pin pitch and dimensions
• Mounting Type: Surface mount compatibility
• Moisture Sensitivity Level: MSL 1 or equivalent

The SN74ACT1284DWR from Texas Instruments meets all substitution criteria, maintaining functional equivalence and physical compatibility with the original 74ACT1284SCX design.

Parameter Comparison

Engineering Selection Recommendations

The SN74ACT1284DWR serves as a direct functional substitute for the 74ACT1284SCX. Both components share identical logic functionality, bit configuration, supply voltage specifications, and 20-SOIC packaging. The primary distinction is product lifecycle status: the 74ACT1284SCX is obsolete, while the SN74ACT1284DWR maintains active production status from Texas Instruments.

The SN74ACT1284DWR carries ROHS3 compliance certification, supporting modern regulatory requirements. Operating temperature range differs between the two parts: the original spans -40°C to 85°C, while the substitute operates from 0°C to 70°C. This temperature differential must be evaluated against specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT1284DWR directly replace the 74ACT1284SCX in existing designs?

A: Yes, the SN74ACT1284DWR provides direct functional and physical replacement. Both components implement IEEE STD 1284 translation transceiver functionality with identical 7-bit configuration, supply voltage range (4.5V ~ 5.5V), and 20-SOIC package dimensions. Pin-to-pin compatibility is maintained.

Q: What is the significance of the operating temperature range difference?

A: The 74ACT1284SCX operates across -40°C to 85°C, while the SN74ACT1284DWR operates from 0°C to 70°C. Applications requiring operation below 0°C or above 70°C must verify that the substitute meets thermal specifications. Most commercial and industrial applications operate within the 0°C to 70°C range.

Q: Does the ROHS3 compliance of the SN74ACT1284DWR affect compatibility?

A: ROHS3 compliance indicates adherence to hazardous substance restrictions and supports modern supply chain requirements. This certification does not affect electrical or functional compatibility with the original part.

Q: Are there packaging format options for the SN74ACT1284DWR?

A: The SN74ACT1284DWR is available in Cut Tape (CT) and Digi-Reel packaging formats, as well as Tape & Reel (TR) configuration. Select the packaging format appropriate for your procurement and assembly requirements.

Q: What is the MSL rating and why does it matter?

A: Both components carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity limitations. These parts do not require special moisture control during storage or handling, simplifying logistics and inventory management.