SN74HC161PWT Equivalent & Substitute Parts

Part Overview

The SN74HC161PWT is a 4-bit binary counter logic IC manufactured by Texas Instruments in a 16-TSSOP surface mount package. This component functions as a synchronous counter with asynchronous reset, commonly used in digital counting and frequency division applications. The part carries a Last Time Buy status, indicating discontinued production. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring 4-bit binary counter functionality.

Substiute Parts

SN74HC161PWT

Texas InstrumentsIn Stock: 2057SN74HC161PWT Datasheet

Current PartRFQ

SN74HC161PWR

Texas InstrumentsIn Stock: 3085SN74HC161PWR Datasheet

Parametric EquivalentRFQ

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 SN74HC161PWT is determined by strict equivalence across the following parameters: logic type (binary counter), bit width (4-bit), count direction (up), reset configuration (asynchronous), timing mode (synchronous), trigger type (positive edge), supply voltage range (2 V to 6 V minimum), package type (16-TSSOP), and mounting method (surface mount). All substitute parts listed maintain these core electrical and mechanical specifications. Variations in count rate, maximum operating temperature, and product status are noted but do not prevent functional substitution when the application requirements fall within the specified ranges of the substitute part.

Parameter Comparison

Engineering Selection Recommendations

SN74HC161PWR (Texas Instruments) is the primary substitute, offering identical electrical specifications and active product status, ensuring long-term availability and supply chain stability.

74HC161PW,118 (Nexperia USA Inc.) provides enhanced performance with a 48 MHz count rate and extended operating temperature range to 125°C, suitable for applications requiring higher speed or elevated temperature operation within the -40°C to 125°C window.

MC74HC161ADTR2G (onsemi) in Cut Tape packaging offers the highest current inventory (5667 Pcs) and maintains full electrical equivalence, though it carries Last Time Buy status. This part is suitable for immediate procurement needs.

MC74HC161ADTG (onsemi) provides equivalent functionality but with unspecified packaging details, limiting its suitability for automated assembly processes requiring standardized package specifications.

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical 16-TSSOP package dimensions, ensuring mechanical and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74HC161PWR directly replace SN74HC161PWT? A: Yes. Both parts share identical electrical specifications, including 36 MHz count rate, -40°C to 85°C operating range, 2 V to 6 V supply voltage, and 16-TSSOP package. SN74HC161PWR has active product status, making it the recommended primary substitute.

Q: What is the difference between 74HC161PW,118 and the original part? A: The 74HC161PW,118 maintains all core counter functionality but offers a higher count rate (48 MHz versus 36 MHz) and extended operating temperature range (-40°C to 125°C versus -40°C to 85°C). These enhancements do not prevent substitution; they expand the application envelope.

Q: Are onsemi parts (MC74HC161ADTG and MC74HC161ADTR2G) suitable replacements? A: Yes, both onsemi parts are electrically equivalent. MC74HC161ADTR2G in Cut Tape packaging is preferred for immediate availability. Both carry Last Time Buy status, similar to the original SN74HC161PWT.

Q: Does packaging type affect substitution? A: Packaging affects supply chain logistics and assembly compatibility. Tape & Reel (TR) packaging suits high-volume automated assembly. Cut Tape (CT) packaging is appropriate for lower-volume or manual assembly processes. All listed parts use the same 16-TSSOP case dimensions (0.173", 4.40mm width), ensuring PCB footprint compatibility.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements equivalent to the original part.

Q: Which substitute should I select for new designs? A: SN74HC161PWR is recommended for new designs due to active product status and guaranteed long-term availability. For applications requiring higher speed or extended temperature operation, 74HC161PW,118 is suitable.