CD74HCT161M Equivalent & Substitute Parts

Part Overview

The CD74HCT161M is a 4-bit binary counter IC manufactured by Texas Instruments, designed for synchronous counting applications with positive edge triggering. This device operates across a supply voltage range of 4.5V to 5.5V and achieves a maximum count rate of 20 MHz. The part is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is essential for design continuity, long-term project support, and supply chain resilience when the original part becomes unavailable.

Substiute Parts

CD74HCT161M

Texas InstrumentsIn Stock: 1650CD74HCT161M Datasheet

Current PartRFQ

CD74HCT161M96

Texas InstrumentsIn Stock: 3309CD74HCT161M96 Datasheet

MFR RecommendedRFQ

74HC688PW,118

Nexperia USA Inc.In Stock: 347674HC688PW,118 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HCT161M is determined by the following critical parameters:

Primary Substitution Criteria:

• Logic Type: Binary Counter (4-bit configuration)
• Package / Case: 16-SOIC form factor
• Voltage - Supply: 4.5V ~ 5.5V compatibility
• Count Rate: Minimum 20 MHz performance
• Mounting Type: Surface Mount
• Compliance: ROHS3 Compliant

Identified Substitute:

The CD74HCT161M96 is a direct manufacturer-recommended substitute. This part maintains identical functional specifications, electrical parameters, and package configuration while offering Active product status and improved availability (3252 units in stock versus 1609 units for the original part). The primary distinction is packaging format: CD74HCT161M96 is supplied in Cut Tape (CT) & Digi-Reel format, whereas the original uses Tube packaging.

The 74HC688PW,118 listed in the substitute field is not a functional equivalent. This part is an 8-bit Identity Comparator with fundamentally different logic type, pin configuration (20-TSSOP package), and operational characteristics. It does not meet the substitution criteria for binary counter applications.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT161M96 is the appropriate substitute for the CD74HCT161M based on the following engineering factors:

Product Status: The CD74HCT161M96 maintains Active status, ensuring continued manufacturer support, availability, and compliance updates. The original part's Last Time Buy designation indicates production discontinuation.

Compliance & Certifications: Both parts maintain identical ROHS3 compliance, REACH Unaffected status, and ECCN/HTSUS classifications, ensuring regulatory continuity in applications subject to environmental and trade compliance requirements.

Functional Equivalence: Electrical specifications, timing characteristics, and pin configuration are identical, enabling direct substitution without circuit redesign or board layout modification.

Packaging Consideration: The shift from Tube to Cut Tape & Digi-Reel packaging affects procurement and assembly processes but does not impact electrical performance or mechanical compatibility with 16-SOIC footprints.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT161M96 be used as a direct replacement for the CD74HCT161M?

A: Yes. The CD74HCT161M96 is a direct functional and electrical equivalent. Both parts share identical pin configuration, voltage specifications, count rate performance, and operating temperature range. The 16-SOIC package footprint is identical, requiring no PCB modifications.

Q: What is the difference between Tube and Cut Tape & Digi-Reel packaging?

A: Packaging format affects component delivery and assembly handling. Tube packaging supplies components in plastic tubes for manual or semi-automated pick-and-place operations. Cut Tape & Digi-Reel format provides components on continuous tape suitable for automated assembly equipment. Electrical and mechanical specifications remain unchanged.

Q: Why is the 74HC688PW,118 listed as a substitute but not recommended?

A: The 74HC688PW,118 is an 8-bit Identity Comparator with a different logic type, pin count (20-TSSOP package), and functional purpose. It does not meet the substitution criteria for 4-bit binary counter applications and cannot replace the CD74HCT161M in circuit designs.

Q: Are there any compliance or regulatory differences between the original and substitute part?

A: No. Both the CD74HCT161M and CD74HCT161M96 maintain identical ROHS3 compliance, REACH Unaffected status, and trade classification codes. Regulatory requirements are satisfied by either part.

Q: What is the inventory status for the substitute part?

A: The CD74HCT161M96 has 3252 units in stock, compared to 1609 units for the original CD74HCT161M, providing improved availability and supply chain security.