74ACT257PC Equivalent & Substitute Parts

Part Overview

The 74ACT257PC is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repairs, and legacy design support. The 74ACT257 series provides single-supply operation suitable for digital logic applications requiring multiplexing functionality.

Substiute Parts

74ACT257PC

onsemiIn Stock: 209274ACT257PC Datasheet

Current PartRFQ

CD74ACT257E

Harris CorporationIn Stock: 15731CD74ACT257E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT257PC is determined by the following critical parameters:

• Circuit Configuration: Must be 4 x 2:1 multiplexer topology
• Package Type: Must be 16-DIP (0.300", 7.62mm) for mechanical and electrical compatibility
• Mounting Type: Must be through-hole for PCB integration compatibility
• Voltage Supply Range: Must support 4.5V ~ 5.5V single-supply operation
• Base Product Number: 74ACT257 series designation

The CD74ACT257E from Harris Corporation meets all substitution criteria within the allowed parameter set. Both parts share identical circuit configuration, package dimensions, and voltage supply specifications, enabling direct functional replacement in legacy applications.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT257E serves as a direct functional substitute for the 74ACT257PC based on matching circuit topology, package dimensions, and voltage supply specifications. Both components are classified as obsolete products, reflecting their legacy status in the 74ACT logic family.

Selection between these parts should consider:

• Packaging Format: The 74ACT257PC is supplied as individual units, while the CD74ACT257E is supplied in tube packaging. Verify packaging compatibility with assembly and handling requirements.
• Compliance Status: The CD74ACT257E is marked as RoHS non-compliant. Applications subject to RoHS regulations must evaluate compliance implications before selection.
• Inventory Availability: Current stock levels differ between manufacturers. Verify availability against project timelines.

Both parts share identical electrical specifications for voltage supply, package configuration, and circuit function, confirming substitution viability for legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT257E replace the 74ACT257PC in existing designs?

A: Yes. Both parts are 4 x 2:1 multiplexers in 16-DIP packages with identical voltage supply ranges (4.5V ~ 5.5V). The package dimensions and pinout are identical, enabling direct PCB substitution.

Q: What are the key differences between these parts?

A: The primary differences are manufacturer origin (onsemi vs. Harris Corporation), packaging format (individual vs. tube), and RoHS compliance status (unaffected vs. non-compliant). Electrical function and package type are identical.

Q: Are there any output current differences I should consider?

A: Output current specifications differ between parts. The 74ACT257PC provides 24mA output current (high and low), while the CD74ACT257E provides 75mA. Applications requiring higher output drive capability may benefit from the CD74ACT257E, though both meet the 4.5V ~ 5.5V supply specification.

Q: Does the operating temperature range affect substitution?

A: The 74ACT257PC operates from -40°C to 85°C, while the CD74ACT257E operates from -55°C to 125°C. The CD74ACT257E provides extended temperature range coverage. For applications within the 74ACT257PC range, both parts are functionally equivalent.

Q: What packaging considerations apply to these parts?

A: Both parts use 16-DIP through-hole packages with identical 0.300" (7.62mm) spacing. They are mechanically and electrically compatible for PCB mounting. Verify that your assembly process accommodates the supplied packaging format (individual vs. tube).