74VHC161MTC Equivalent & Substitute Parts

Part Overview

The 74VHC161MTC is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-TSSOP surface mount package. This component functions as a synchronous binary counter with asynchronous reset, designed for digital logic applications requiring counting operations. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

74VHC161MTC

onsemiIn Stock: 181874VHC161MTC Datasheet

Current PartRFQ

MC74HC161ADTG

onsemiIn Stock: 2458MC74HC161ADTG Datasheet

DirectRFQ

SN74LV161APW

Texas InstrumentsIn Stock: 3449SN74LV161APW Datasheet

DirectRFQ

SN74LV161APWR

Texas InstrumentsIn Stock: 15367SN74LV161APWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHC161MTC is determined by the following core parameters:

• Logic Function: All substitutes must be 4-bit binary counters with identical counting direction (up) and trigger mechanism (positive edge)
• Reset Architecture: Asynchronous reset capability is required
• Timing Mode: Synchronous operation is mandatory
• Package Compatibility: 16-TSSOP surface mount package ensures mechanical and electrical pin compatibility
• Voltage Supply Range: Operating voltage must encompass or be compatible with the 2 V ~ 5.5 V specification
• Operating Temperature Range: -40°C ~ 85°C compatibility required
• Pin Configuration: Identical pinout within the 16-TSSOP package

The identified substitutes fall into two categories: direct manufacturer equivalents (MC74HC161ADTG from onsemi) and cross-manufacturer alternatives (SN74LV161APW and SN74LV161APWR from Texas Instruments). All maintain functional equivalence through identical logic architecture and package specifications.

Parameter Comparison

Engineering Selection Recommendations

MC74HC161ADTG (onsemi): This part maintains manufacturer continuity within the onsemi product line and shares identical package and functional specifications with the 74VHC161MTC. However, the count rate is reduced to 35 MHz compared to the original 125 MHz specification. This substitute is suitable for applications where maximum frequency is not a critical constraint. The part is listed as Last Time Buy, indicating limited future availability.

SN74LV161APW (Texas Instruments): This cross-manufacturer substitute provides a count rate of 95 MHz, closer to the original specification than the MC74HC161ADTG. The part is discontinued at DiGi Electronics, limiting procurement options. RoHS3 compliance is confirmed. This option is suitable for designs where Texas Instruments supply chain integration is preferred and frequency requirements are between 35 MHz and 95 MHz.

SN74LV161APWR (Texas Instruments): This variant of the SN74LV161APW maintains identical electrical and functional specifications while offering active product status. With 15,285 pieces in stock and availability in Cut Tape and Digi-Reel packaging, this part provides the most reliable long-term supply continuity. The 95 MHz count rate and RoHS3 compliance make this the preferred substitute for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the MC74HC161ADTG replace the 74VHC161MTC in all applications?

A: The MC74HC161ADTG is functionally equivalent in logic architecture, package, and pin configuration. However, the count rate specification differs: 35 MHz versus 125 MHz. Substitution is valid only for applications where the maximum operating frequency does not exceed 35 MHz.

Q: What is the primary difference between the 74VHC and 74HC series?

A: Both series implement identical 4-bit binary counter logic with the same package and pinout. The 74VHC series (Very High Speed CMOS) operates at 125 MHz, while the 74HC series (High Speed CMOS) operates at 35 MHz. The voltage supply range for 74HC extends to 6 V compared to 5.5 V for 74VHC.

Q: Why is SN74LV161APWR recommended over SN74LV161APW?

A: Both parts are electrically and functionally identical. The SN74LV161APWR is listed as Active with significantly higher inventory (15,285 pieces) and multiple packaging options (Cut Tape and Digi-Reel), ensuring superior long-term availability and supply chain reliability.

Q: Are all substitutes pin-compatible with the 74VHC161MTC?

A: Yes. All identified substitutes use the 16-TSSOP package with identical pinout. Direct PCB replacement is possible without circuit modification.

Q: What compliance certifications apply to these substitutes?

A: All substitute parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.39.0001. Moisture sensitivity level is 1 (Unlimited) for all parts.

Q: Can the 74VHC161MTC operate at the reduced frequency of the MC74HC161ADTG?

A: Yes. The 74VHC161MTC is capable of operating at frequencies below its maximum 125 MHz specification. Applications designed for 35 MHz operation will function correctly with either part.