SN74HC161ANS Equivalent & Substitute Parts

Part Overview

The SN74HC161ANS is a 4-bit binary counter IC manufactured by Texas Instruments, currently in Last Time Buy status. This component is a synchronous, positive edge-triggered counter with asynchronous reset capability, operating across a 2V to 6V supply range. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term production planning.

Substiute Parts

SN74HC161ANS

Texas InstrumentsIn Stock: 3865SN74HC161ANS Datasheet

Current PartRFQ

SN74HC161ANSR

Texas InstrumentsIn Stock: 5838SN74HC161ANSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SN74HC161ANSR qualifies as a direct functional substitute based on the following critical parameters:

• Logic Type & Function: Both are 4-bit binary counters with identical counting direction (up) and element configuration (1 element, 4 bits per element)
• Trigger & Reset Characteristics: Both employ positive edge triggering with asynchronous reset
• Electrical Specifications: Identical supply voltage range (2V ~ 6V) and operating temperature range (-40°C ~ 85°C)
• Performance: Both support 36 MHz count rate
• Compliance & Certifications: Both are ROHS3 compliant, MSL Level 1, and REACH unaffected
• Base Product Number: Both share the 74HC161 base designation, confirming functional equivalence

The primary difference is packaging: SN74HC161ANS uses DIP packaging, while SN74HC161ANSR uses Surface Mount (16-SOIC) with Tape & Reel delivery.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC161ANSR is a valid functional substitute for the SN74HC161ANS. Both parts maintain identical electrical and logical specifications, ensuring pin-compatible operation within the same circuit topology. The SN74HC161ANSR carries Active product status, providing extended availability compared to the Last Time Buy designation of the original part.

Selection between these parts depends on board-level design constraints: the SN74HC161ANS requires through-hole mounting infrastructure, while the SN74HC161ANSR is optimized for surface mount assembly. Both parts satisfy ROHS3 and REACH compliance requirements, with equivalent moisture sensitivity ratings suitable for standard storage and handling conditions.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC161ANSR directly replace the SN74HC161ANS in existing designs?

A: Electrical and logical substitution is valid. Pin configuration and functional behavior are identical. Physical mounting requirements differ: SN74HC161ANS uses DIP through-hole mounting, while SN74HC161ANSR uses 16-SOIC surface mount. PCB layout modification is required for substitution.

Q: Are there any timing or performance differences between these parts?

A: No. Both parts specify identical count rate (36 MHz), supply voltage range (2V ~ 6V), and operating temperature range (-40°C ~ 85°C). Functional performance is equivalent.

Q: What is the significance of the Last Time Buy status for the SN74HC161ANS?

A: Last Time Buy indicates the manufacturer will discontinue production. The SN74HC161ANSR, with Active status, represents the recommended path for future procurement and production planning.

Q: Do both parts meet the same compliance standards?

A: Yes. Both are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 (Unlimited) moisture sensitivity ratings. Compliance profiles are identical.

Q: What packaging format is the SN74HC161ANSR supplied in?

A: The SN74HC161ANSR is supplied in Tape & Reel (TR) format, standard for surface mount component distribution and automated assembly processes.