CD74HC161MT Equivalent & Substitute Parts

Part Overview

The CD74HC161MT is a 4-bit binary counter logic IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a synchronous counter with asynchronous reset, operating at a maximum count rate of 24 MHz across a supply voltage range of 2V to 6V. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain functional equivalence in counter operation, timing characteristics, and package compatibility while meeting current availability and compliance requirements.

Substiute Parts

CD74HC161MT

Texas InstrumentsIn Stock: 1974CD74HC161MT Datasheet

Current PartRFQ

CD74HC161M96

Texas InstrumentsIn Stock: 9899CD74HC161M96 Datasheet

Parametric EquivalentRFQ

74HC161D,652

Nexperia USA Inc.In Stock: 129574HC161D,652 Datasheet

MFR RecommendedRFQ

74HC161D,653

Nexperia USA Inc.In Stock: 1429574HC161D,653 Datasheet

MFR RecommendedRFQ

MC74HC161ADR2G

onsemiIn Stock: 10239MC74HC161ADR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HC161MT is determined by strict equivalence across the following critical parameters: logic type (binary counter), bit configuration (4-bit), counter direction (up), reset mechanism (asynchronous), timing mode (synchronous), trigger type (positive edge), supply voltage range (2V to 6V), and package type (16-SOIC surface mount). All substitute parts listed maintain these core functional and physical specifications. Variations in count rate, operating temperature range, and product status are noted but do not preclude substitution when the application requirements fall within the specified operating envelope of the substitute part.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the CD74HC161MT, the CD74HC161M96 from Texas Instruments is the primary equivalent, maintaining identical electrical specifications and operating temperature range while offering active product status and improved availability. The 74HC161D,653 from Nexperia USA Inc. serves as an alternative with active status and higher count rate capability (48 MHz), suitable for applications operating within the -40°C to 125°C temperature range. The MC74HC161ADR2G from onsemi provides a substitute option with last-time-buy status; this part operates within a narrower temperature range (-40°C to 85°C) and should be selected only when application temperature requirements fall within this envelope. All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC161M96 directly replace the CD74HC161MT? A: Yes. Both parts are manufactured by Texas Instruments and maintain identical functional specifications, supply voltage range, package type, and operating temperature range. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect electrical performance.

Q: What is the significance of the higher count rate in the Nexperia 74HC161D,653 (48 MHz) compared to the original CD74HC161MT (24 MHz)? A: The higher count rate indicates the maximum frequency at which the counter can operate. Applications designed for the CD74HC161MT operating at or below 24 MHz will function correctly with the 74HC161D,653. The higher rating provides additional performance margin but does not require circuit modification.

Q: Are there temperature range limitations when substituting with the MC74HC161ADR2G? A: Yes. The MC74HC161ADR2G operates from -40°C to 85°C, compared to the CD74HC161MT range of -55°C to 125°C. This part is suitable only for applications where the operating environment remains within the -40°C to 85°C window.

Q: Do all substitute parts use the same 16-SOIC package? A: Yes. All listed substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring physical and electrical pin compatibility on the PCB.

Q: What is the difference between the Nexperia parts 74HC161D,652 and 74HC161D,653? A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is packaging: 74HC161D,652 is supplied in Tube format, while 74HC161D,653 is supplied in Tape & Reel (TR) format. Selection depends on procurement and assembly requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, meeting current environmental and manufacturing standards.