74ACT161PC Binary Counter IC Equivalent & Substitute Parts

Part Overview

The 74ACT161PC is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-DIP package. This synchronous counter with asynchronous reset operates at a maximum count rate of 125 MHz and is designed for positive edge triggering applications. The device is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance, repair, and legacy product support.

Substiute Parts

74ACT161PC

onsemiIn Stock: 183274ACT161PC Datasheet

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CD74ACT161E

Harris CorporationIn Stock: 19375CD74ACT161E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT161PC are identified based on strict equivalence across the following critical parameters:

• Logic Type: Binary Counter
• Bit Configuration: 4-bit, single element
• Count Direction: Up
• Reset Architecture: Asynchronous
• Timing Mode: Synchronous
• Trigger Mechanism: Positive Edge
• Supply Voltage Range: 4.5 V ~ 5.5 V
• Package Configuration: 16-DIP (0.300", 7.62mm) through-hole

The CD74ACT161E, manufactured by Harris Corporation, meets all these core functional and physical requirements, establishing it as a direct substitute for the 74ACT161PC.

Parameter Comparison

Engineering Selection Recommendations

Both the 74ACT161PC and CD74ACT161E are classified as obsolete products. The CD74ACT161E serves as a functional substitute based on matching core counter specifications and package configuration.

The CD74ACT161E exhibits a lower maximum count rate (80 MHz versus 125 MHz) and an extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C). These differences must be evaluated against specific application requirements. The CD74ACT161E is RoHS non-compliant, whereas the 74ACT161PC carries REACH Unaffected status.

Selection between these parts should be determined by application-specific timing constraints, temperature operating conditions, and regulatory compliance requirements for the end system.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT161E directly replace the 74ACT161PC in existing designs?

A: The CD74ACT161E is functionally equivalent in counter logic, bit configuration, and package form factor. However, the reduced maximum count rate (80 MHz versus 125 MHz) and different operating temperature range must be verified against circuit timing and thermal requirements before substitution.

Q: Are there pin-to-pin compatibility differences between these parts?

A: Both devices use the 16-DIP package with identical pinout configuration. Through-hole mounting compatibility is maintained.

Q: What is the significance of the different maximum count rates?

A: The 74ACT161PC supports operation up to 125 MHz, while the CD74ACT161E is rated to 80 MHz. Applications requiring clock frequencies above 80 MHz cannot use the CD74ACT161E as a substitute.

Q: How do the operating temperature ranges differ?

A: The 74ACT161PC operates from -40°C to 85°C, while the CD74ACT161E operates from -55°C to 125°C. Applications requiring operation below -40°C or above 85°C must verify compatibility with the substitute part's extended range.

Q: What does RoHS non-compliant status mean for the CD74ACT161E?

A: The CD74ACT161E does not meet Restriction of Hazardous Substances (RoHS) directives. Systems requiring RoHS compliance cannot use this substitute. The 74ACT161PC carries REACH Unaffected status, indicating different regulatory classification.