SN74HC161PW Equivalent & Substitute Parts

Part Overview

The SN74HC161PW is a 4-bit binary counter IC manufactured by Texas Instruments in a 16-TSSOP surface mount package. This logic component functions as a synchronous counter with asynchronous reset, operating across a 2V to 6V supply range with a maximum count rate of 36 MHz. The part is currently in Last Time Buy status, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 4-bit binary counter functionality.

Substiute Parts

SN74HC161PW

Texas InstrumentsIn Stock: 2038SN74HC161PW Datasheet

Current PartRFQ

SN74HC161PWR

Texas InstrumentsIn Stock: 3085SN74HC161PWR Datasheet

MFR RecommendedRFQ

74HC161PW,118

Nexperia USA Inc.In Stock: 347774HC161PW,118 Datasheet

MFR RecommendedRFQ

MC74HC161ADTG

onsemiIn Stock: 2458MC74HC161ADTG Datasheet

MFR RecommendedRFQ

MC74HC161ADTR2G

onsemiIn Stock: 5774MC74HC161ADTR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC161PW is determined by strict equivalence across the following critical parameters: 4-bit binary counter configuration, positive edge trigger, asynchronous reset with synchronous timing, 16-TSSOP package footprint, surface mount mounting type, and 2V to 6V supply voltage compatibility. All substitute parts must maintain identical logic functionality and pinout. Count rate variations and operating temperature range extensions do not prevent substitution when the application operates within the original part's specifications. Packaging format (Tube, Tape & Reel, or Cut Tape) affects procurement and handling but does not affect electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring immediate replacement of the SN74HC161PW, the SN74HC161PWR from Texas Instruments is the primary substitute. This part maintains identical electrical specifications and is in Active product status, ensuring long-term availability. The packaging format differs (Tape & Reel versus Tube), but electrical and mechanical compatibility is complete.

The 74HC161PW,118 from Nexperia USA Inc. provides an alternative with enhanced specifications: higher count rate (48 MHz versus 36 MHz) and extended operating temperature range (-40°C to 125°C versus -40°C to 85°C). This part is in Active status and offers superior performance margins for demanding applications. The higher count rate and extended temperature range do not create incompatibility with designs specified for the original part.

The MC74HC161ADTG and MC74HC161ADTR2G from onsemi are functionally equivalent substitutes with count rates of 35 MHz and operating temperature ranges of -40°C to 85°C. Both parts are in Last Time Buy status. The MC74HC161ADTR2G offers higher inventory availability (5667 pieces) in Cut Tape packaging format.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and identical 16-TSSOP package dimensions, ensuring direct compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC161PWR replace the SN74HC161PW in my design?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format: SN74HC161PWR is supplied in Tape & Reel format while SN74HC161PW is supplied in Tube format. Electrical performance, pinout, and functionality are equivalent.

Q: Is the 74HC161PW,118 from Nexperia a direct substitute?

A: Yes. The 74HC161PW,118 is functionally equivalent and maintains the same 16-TSSOP package footprint and pinout. It offers higher count rate (48 MHz) and extended operating temperature range (-40°C to 125°C), making it suitable for applications originally designed for the SN74HC161PW.

Q: What is the difference between the onsemi MC74HC161ADTG and MC74HC161ADTR2G?

A: Both parts are electrically identical with 35 MHz count rate and -40°C to 85°C operating temperature. The primary difference is packaging: MC74HC161ADTG packaging is not specified, while MC74HC161ADTR2G is supplied in Cut Tape format. Both are functionally equivalent to the SN74HC161PW.

Q: Does packaging format affect electrical compatibility?

A: No. Tube, Tape & Reel, and Cut Tape formats are procurement and handling variations only. They do not affect electrical performance, pinout compatibility, or functionality. Selection should be based on assembly process requirements and inventory management.

Q: Why is the SN74HC161PW in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer has discontinued production. Substitute parts in Active status (SN74HC161PWR and 74HC161PW,118) are recommended for new designs to ensure long-term supply chain stability.

Q: Can I use a substitute part with higher count rate or extended temperature range?

A: Yes. Parts with higher count rates (48 MHz versus 36 MHz) or extended temperature ranges (-40°C to 125°C versus -40°C to 85°C) are backward compatible. They provide equal or superior performance for applications designed within the original part's specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and are REACH unaffected, meeting environmental and regulatory requirements equivalent to the original SN74HC161PW.