N74F161AD,623 Equivalent & Substitute Parts

Part Overview

The N74F161AD,623 is a 4-bit binary counter logic IC manufactured by NXP Semiconductors in a 16-SOIC surface mount package. This component functions as a synchronous binary counter with asynchronous reset, designed for positive edge triggering applications. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

N74F161AD,623

NXP SemiconductorsIn Stock: 982N74F161AD,623 Datasheet

Current PartRFQ

SN74F161AD

Texas InstrumentsIn Stock: 2507SN74F161AD Datasheet

DirectRFQ

SN74F161ADR

Texas InstrumentsIn Stock: 3094SN74F161ADR Datasheet

DirectRFQ

SN74F161ANSR

Texas InstrumentsIn Stock: 2892SN74F161ANSR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the N74F161AD,623 is determined by strict alignment with the following core parameters: logic type (binary counter), bit configuration (4-bit), element count (1), counting direction (up), reset mechanism (asynchronous), timing architecture (synchronous), trigger polarity (positive edge), supply voltage range (4.5 V ~ 5.5 V), operating temperature range (0°C ~ 70°C), and surface mount packaging classification.

The substitute parts identified—SN74F161AD, SN74F161ADR, and SN74F161ANSR—all share the base product number 74F161 and maintain functional equivalence across these critical parameters. Variations in packaging format (16-SOIC at 0.154" width versus 16-SO at 0.209" width) and supplier packaging method (tube, tape & reel) represent secondary considerations that do not affect electrical functionality but require PCB layout verification.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing system support, SN74F161ADR is the primary substitute for the obsolete N74F161AD,623. This Texas Instruments part maintains active product status, ensuring long-term availability and supply chain stability. Both SN74F161ADR and SN74F161ANSR are manufactured by Texas Instruments and carry active product designations, providing superior lifecycle support compared to the last-time-buy status of SN74F161AD.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, matching the environmental and regulatory requirements of the original component. The primary distinction between SN74F161ADR and SN74F161ANSR is package width: SN74F161ADR uses the narrower 16-SOIC format (0.154", 3.90mm width) matching the original footprint, while SN74F161ANSR employs a wider 16-SO package (0.209", 5.30mm width) requiring PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can SN74F161ANSR be used as a direct replacement for N74F161AD,623 without PCB modifications?

A: No. While SN74F161ANSR is functionally equivalent, its package width differs (0.209" versus 0.154"). Direct substitution requires PCB footprint redesign. SN74F161ADR maintains the original package dimensions and is preferred for direct replacement.

Q: What is the difference between SN74F161AD and SN74F161ADR?

A: Both parts are electrically identical 4-bit binary counters from Texas Instruments. The primary difference is supplier packaging: SN74F161AD is supplied in tube format, while SN74F161ADR is supplied in tape & reel format. Selection depends on assembly process requirements.

Q: Why is the N74F161AD,623 classified as obsolete?

A: The N74F161AD,623 is an NXP Semiconductors product that has reached end-of-life status. Texas Instruments continues manufacturing functionally equivalent 74F161 variants, making cross-manufacturer substitution the standard approach for component replacement.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The N74F161AD,623 and all identified substitutes (SN74F161AD, SN74F161ADR, SN74F161ANSR) are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What is the maximum count rate difference between the original and substitute parts?

A: The N74F161AD,623 specifies a count rate of 130 MHz, while all Texas Instruments substitutes specify 100 MHz. This difference reflects manufacturer specification variations and does not affect functional compatibility in standard applications.