74HC161N,652 Binary Counter IC - Equivalent & Substitute Parts

Part Overview

The 74HC161N,652 is a 4-bit binary counter IC manufactured by NXP USA Inc., designed for synchronous counting applications with positive edge triggering. This component features a maximum count rate of 48 MHz and operates across a supply voltage range of 2V to 6V. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The 16-DIP through-hole package remains widely supported across multiple manufacturers, enabling direct functional replacement with compatible alternatives.

Substiute Parts

74HC161N,652

NXP USA Inc.In Stock: 75874HC161N,652 Datasheet

Current PartRFQ

CD74HC161E

Harris CorporationIn Stock: 2299CD74HC161E Datasheet

DirectRFQ

SN74HC161N

Texas InstrumentsIn Stock: 13734SN74HC161N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HC161N,652 is determined by strict equivalence across the following parameters: logic type (binary counter), bit configuration (4-bit), element count (1), counting direction (up), reset mechanism (asynchronous), timing mode (synchronous), trigger type (positive edge), supply voltage range (2V ~ 6V), package type (16-DIP), and mounting method (through hole). All substitute parts listed maintain these core functional and physical specifications. Variations in count rate, operating temperature range, and product status do not preclude substitution but are documented for application-specific evaluation.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC161N manufactured by Texas Instruments is the preferred substitute for the 74HC161N,652. This part maintains ROHS3 compliance, matches the supply voltage and package specifications, and carries active product status, ensuring long-term availability and supply chain stability. The SN74HC161N operates at 36 MHz, which exceeds the minimum functional requirements for most applications while remaining below the original part's 48 MHz specification.

The CD74HC161E from Harris Corporation provides functional equivalence but carries RoHS non-compliance status and obsolete product classification. This part is suitable only for legacy system maintenance where RoHS compliance is not a requirement and where the 24 MHz count rate meets application timing constraints.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC161N directly replace the 74HC161N,652 in existing designs?

A: Yes. Both parts share identical logic type, bit configuration, reset mechanism, timing mode, trigger type, supply voltage range, package type, and mounting method. The SN74HC161N operates at 36 MHz, which is compatible with applications designed for the original 48 MHz specification.

Q: What is the significance of the different count rates among these parts?

A: Count rate represents the maximum frequency at which the counter can operate. The 74HC161N,652 at 48 MHz, SN74HC161N at 36 MHz, and CD74HC161E at 24 MHz all exceed typical application requirements. Selection should be based on specific timing constraints; a lower count rate does not prevent substitution if the application operates below that threshold.

Q: Does RoHS compliance affect substitution decisions?

A: RoHS compliance is a regulatory and supply chain consideration. The SN74HC161N and 74HC161N,652 are both ROHS3 compliant, making them suitable for applications subject to RoHS requirements. The CD74HC161E is RoHS non-compliant and should be used only in applications where such compliance is not mandated.

Q: Are there package or pinout differences between these parts?

A: No. All three parts use the 16-DIP (0.300", 7.62mm) through-hole package with identical pinout, enabling direct socket replacement without PCB modification.

Q: Why is the 74HC161N,652 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SN74HC161N from Texas Instruments remains in active production, providing a reliable long-term supply source for this functional category.