74ACT161MTC Equivalent & Substitute Parts

Part Overview

The 74ACT161MTC is a 4-bit binary counter IC manufactured by onsemi, designed for synchronous counting applications with positive edge triggering. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The 74ACT161 series provides reliable digital counting functionality across industrial and commercial electronics.

Substiute Parts

74ACT161MTC

onsemiIn Stock: 99974ACT161MTC Datasheet

Current PartRFQ

CD74ACT161M96

Texas InstrumentsIn Stock: 4021CD74ACT161M96 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT161MTC is determined by strict equivalence across the following critical parameters:

• Logic Function: Binary counter with 4-bit capacity, up-counting direction
• Electrical Interface: Asynchronous reset with synchronous timing, positive edge triggering
• Supply Voltage: 4.5 V to 5.5 V operating range
• Mounting Technology: Surface mount configuration
• Series Compatibility: 74ACT logic family base product number

The CD74ACT161M96 manufactured by Texas Instruments qualifies as a direct substitute based on matching logic type, bit configuration, counting direction, reset mechanism, timing characteristics, trigger type, and supply voltage specifications. Package differences (16-TSSOP versus 16-SOIC) and performance variations (count rate and temperature range) do not prevent functional substitution when circuit board layout and thermal requirements permit.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT161M96 is the qualified substitute for the obsolete 74ACT161MTC. Selection of this substitute is supported by:

• Product Status: The substitute maintains active production status, ensuring long-term availability and supply chain continuity.
• Functional Equivalence: Identical logic configuration, bit width, counting direction, and electrical interface specifications enable direct functional replacement.
• Compliance: Both parts maintain REACH Unaffected status and carry identical ECCN and HTSUS classifications, supporting regulatory consistency.
• Thermal Performance: The substitute provides an extended operating temperature range (-55°C to 125°C versus -40°C to 85°C), offering improved performance margin in temperature-sensitive applications.
• Package Consideration: The 16-SOIC package is narrower (3.90mm versus 4.40mm) than the original 16-TSSOP, requiring PCB layout verification for pin-to-pin compatibility and trace routing.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT161M96 replace the 74ACT161MTC in existing designs?

A: Yes, the CD74ACT161M96 provides functional equivalence across all critical logic parameters. PCB layout modification may be required due to package geometry differences between 16-TSSOP and 16-SOIC configurations.

Q: What is the significance of the count rate difference (125 MHz versus 80 MHz)?

A: The original part specifies 125 MHz maximum count rate, while the substitute specifies 80 MHz. In applications operating below 80 MHz, this difference is not limiting. Applications requiring operation above 80 MHz require design review to confirm compatibility.

Q: Are there any compliance or certification differences between these parts?

A: Both parts carry identical REACH, ECCN, and HTSUS classifications. The substitute maintains MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original specification.

Q: How do the operating temperature ranges affect part selection?

A: The substitute provides a wider operating temperature range (-55°C to 125°C) compared to the original (-40°C to 85°C). This extended range supports applications in more demanding thermal environments without functional degradation.

Q: What packaging considerations apply to this substitution?

A: The 16-SOIC package (3.90mm width) differs from the 16-TSSOP package (4.40mm width). Footprint conversion requires PCB redesign. Both packages are surface mount configurations with identical pin counts and electrical interface specifications.