74ACT1284SC Equivalent & Substitute Parts

Part Overview

The 74ACT1284SC is an IEEE STD 1284 Translation Transceiver IC manufactured by onsemi, designed for 7-bit bus interface applications in surface mount 20-SOIC packaging. This component operates within the 4.5V to 5.5V supply voltage range and supports TTL-compatible signal translation. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74ACT1284SC

onsemiIn Stock: 96274ACT1284SC Datasheet

Current PartRFQ

SN74ACT1284DW

Texas InstrumentsIn Stock: 1456SN74ACT1284DW Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT1284SC is determined by strict alignment of the following electrical and mechanical parameters:

• Logic function: IEEE STD 1284 Translation Transceiver architecture
• Bit width: 7-bit configuration
• Supply voltage range: 4.5V to 5.5V compatibility
• Package type: 20-SOIC form factor with identical pin pitch and dimensions
• Mounting technology: Surface mount capability
• Pin count and signal routing: Identical 20-pin SOIC configuration

The SN74ACT1284DW from Texas Instruments meets all substitution criteria within these defined parameters. Both parts share the same base product number (74ACT1284), identical electrical specifications for voltage and bit width, and compatible packaging geometry.

Parameter Comparison

Engineering Selection Recommendations

The SN74ACT1284DW is the direct functional equivalent for the obsolete 74ACT1284SC. Selection of the Texas Instruments part is supported by:

• Identical electrical specifications for supply voltage (4.5V ~ 5.5V) and bit width (7-bit)
• Matching package geometry and pin configuration (20-SOIC)
• Active product status ensuring continued availability and manufacturing support
• ROHS3 compliance certification meeting current regulatory requirements
• Equivalent moisture sensitivity rating and REACH compliance status

The operating temperature range of the SN74ACT1284DW (0°C ~ 70°C) is narrower than the 74ACT1284SC (-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 SN74ACT1284DW directly replace the 74ACT1284SC in existing designs?

A: Yes, the SN74ACT1284DW is a direct substitute. Both parts share identical pin configurations, package dimensions, and electrical specifications for voltage and bit width. No PCB layout modifications are required.

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

A: The main difference is operating temperature range. The 74ACT1284SC operates from -40°C to 85°C, while the SN74ACT1284DW operates from 0°C to 70°C. Additionally, the 74ACT1284SC is obsolete while the SN74ACT1284DW is actively manufactured.

Q: Are there any compliance or regulatory differences?

A: The SN74ACT1284DW carries ROHS3 compliance certification. Both parts maintain REACH Unaffected status and equivalent moisture sensitivity levels (MSL 1).

Q: Does packaging differ between these parts?

A: No. Both parts use identical 20-SOIC surface mount packaging with 0.295" width and 7.50mm dimensions. Tube packaging is available for the SN74ACT1284DW.

Q: What should I verify before substitution in temperature-critical applications?

A: Confirm that your application's operating temperature range falls within 0°C to 70°C. If your system requires operation below 0°C or above 70°C, the narrower temperature range of the SN74ACT1284DW may not be suitable.