74HCT161N,652 Binary Counter IC Equivalent & Substitute Parts

Part Overview

The 74HCT161N,652 is a 4-bit binary counter IC manufactured by NXP USA Inc., designed for synchronous counting applications with positive edge triggering. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and production requirements. The part operates within the 4.5V to 5.5V supply voltage range and supports count rates up to 41 MHz in a 16-DIP through-hole package.

Substiute Parts

74HCT161N,652

NXP USA Inc.In Stock: 85174HCT161N,652 Datasheet

Current PartRFQ

CD74ACT161E

Harris CorporationIn Stock: 19375CD74ACT161E Datasheet

DirectRFQ

CD74HCT161E

Texas InstrumentsIn Stock: 3547CD74HCT161E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT161N,652 is determined by the following critical parameters:

• Logic Type: Binary Counter (must match)
• Number of Elements: 1 (must match)
• Number of Bits per Element: 4 (must match)
• Direction: Up (must match)
• Reset Type: Asynchronous (must match)
• Timing: Synchronous (must match)
• Trigger Type: Positive Edge (must match)
• Voltage - Supply: 4.5 V ~ 5.5 V (must match)
• Package / Case: 16-DIP (0.300", 7.62mm) (must match)
• Mounting Type: Through Hole (must match)

The identified substitute parts CD74HCT161E and CD74ACT161E satisfy all mandatory electrical and mechanical parameters. Both parts maintain identical counter functionality, package configuration, and supply voltage specifications. Variations in count rate, operating temperature range, and product status are secondary considerations that do not affect functional substitution capability.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT161E (Texas Instruments) is the primary substitute for the 74HCT161N,652. This part maintains series compatibility within the 74HCT logic family, carries active product status ensuring long-term availability, and holds ROHS3 compliance certification. The extended operating temperature range (-55°C to 125°C) provides additional thermal margin compared to the original part.

CD74ACT161E (Harris Corporation) serves as an alternative substitute when CD74HCT161E is unavailable. This part operates at a higher count rate (80 MHz) and maintains identical electrical and mechanical specifications. However, RoHS non-compliance status may restrict use in applications subject to environmental regulations. The 74ACT series logic family is functionally compatible with 74HCT series in this counter configuration.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT161E directly replace 74HCT161N,652 in existing designs?

A: Yes. Both parts share identical logic type, bit configuration, counter direction, reset mechanism, timing characteristics, trigger type, supply voltage range, and 16-DIP package specification. Pin-for-pin compatibility is maintained.

Q: What is the significance of the count rate difference between the original part (41 MHz) and CD74HCT161E (20 MHz)?

A: The count rate represents the maximum frequency at which the counter can operate. CD74HCT161E operates at 20 MHz, which is lower than the original 41 MHz specification. Applications requiring count rates above 20 MHz should use CD74ACT161E (80 MHz) or verify that the design does not exceed this frequency limit.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts use the 16-DIP (0.300", 7.62mm) through-hole package. PCB footprints and mounting requirements are identical.

Q: What is the difference between 74HCT and 74ACT series logic families?

A: Both families are CMOS-based logic with identical functional behavior in this counter application. The primary difference is that 74ACT operates at higher speed (80 MHz for this part) compared to 74HCT (20 MHz for this part). Both families maintain the same supply voltage range and pin configuration.

Q: Does the extended operating temperature range of the substitute parts affect compatibility?

A: No. The extended range (-55°C to 125°C for substitutes versus -40°C to 125°C for the original) represents an additional capability. Applications operating within the original temperature range remain fully compatible.

Q: What compliance considerations apply when selecting between CD74HCT161E and CD74ACT161E?

A: CD74HCT161E holds ROHS3 compliance certification, making it suitable for applications subject to environmental regulations. CD74ACT161E is RoHS non-compliant and should be used only in applications where such compliance is not required.