74F161ASJ Equivalent & Substitute Parts

Part Overview

The 74F161ASJ is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-SOP surface mount package. This logic component functions as a synchronous counter with asynchronous reset, operating at a maximum count rate of 120 MHz. The part is currently classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Alternative parts maintain functional compatibility while offering different product statuses and packaging options.

Substiute Parts

74F161ASJ

onsemiIn Stock: 534174F161ASJ Datasheet

Current PartRFQ

SN74F161ANSR

Texas InstrumentsIn Stock: 2892SN74F161ANSR Datasheet

DirectRFQ

SN74F161AD

Texas InstrumentsIn Stock: 2507SN74F161AD Datasheet

SimilarRFQ

SN74F161ADR

Texas InstrumentsIn Stock: 3094SN74F161ADR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F161ASJ is determined by strict equivalence in the following parameters: logic type (binary counter), bit width (4-bit), counting direction (up), reset mechanism (asynchronous), timing architecture (synchronous), and trigger polarity (positive edge). All substitute parts maintain identical supply voltage range (4.5 V ~ 5.5 V) and operating temperature range (0°C ~ 70°C).

The substitute parts are grouped into two categories based on package configuration:

Category 1: 16-SO Package (Tape & Reel)

• SN74F161ANSR (Texas Instruments)

Category 2: 16-SOIC Package (Tube and Tape & Reel)

• SN74F161AD (Texas Instruments, Tube packaging)
• SN74F161ADR (Texas Instruments, Tape & Reel packaging)

All substitutes share the base product number 74F161 and maintain functional equivalence within the 74F logic family. The primary distinction between the main part and substitutes is the count rate specification: the 74F161ASJ supports 120 MHz, while Texas Instruments substitutes are rated at 100 MHz.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, SN74F161ANSR and SN74F161ADR are the preferred substitutes due to their active product status and ROHS3 compliance. Both parts are manufactured by Texas Instruments and maintain full functional equivalence with the obsolete 74F161ASJ.

SN74F161AD carries a Last Time Buy status, indicating limited future availability. This part should be selected only when specific design constraints require the 16-SOIC package with 0.154" width specification and tube packaging format.

The selection between SN74F161ANSR and SN74F161ADR depends on package width requirements and distribution format. SN74F161ANSR uses the 0.209" wide 16-SOIC package in Tape & Reel format. SN74F161ADR uses the 0.154" wide 16-SOIC package, also in Tape & Reel format. Both are actively supported by Texas Instruments.

All substitutes operate within the same supply voltage and temperature ranges as the original part. The count rate reduction from 120 MHz to 100 MHz in Texas Instruments parts should be evaluated against specific application timing requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74F161ANSR directly replace 74F161ASJ in existing designs? A: SN74F161ANSR maintains functional equivalence in logic type, bit width, reset mechanism, and timing architecture. Both parts operate at 4.5 V ~ 5.5 V and 0°C ~ 70°C. The primary difference is the count rate specification: 100 MHz versus 120 MHz. Designs operating below 100 MHz can use this substitute without modification. The package footprint is identical (16-SOIC, 0.209" width).

Q: What is the difference between SN74F161AD and SN74F161ADR? A: Both parts are functionally identical 4-bit binary counters from Texas Instruments with 100 MHz count rate. The difference is packaging format: SN74F161AD is supplied in Tube packaging, while SN74F161ADR is supplied in Tape & Reel (TR) format. Both use the same 16-SOIC package with 0.154" width. Selection depends on assembly line requirements and distribution preferences.

Q: Why does the 74F161ASJ have a higher count rate than the Texas Instruments substitutes? A: The 74F161ASJ is specified at 120 MHz maximum count rate, while Texas Instruments SN74F161 variants are rated at 100 MHz. This reflects different manufacturer specifications for the same logic family. Applications requiring operation above 100 MHz should retain the original onsemi part or evaluate alternative logic families.

Q: Are all substitutes RoHS compliant? A: All Texas Instruments substitutes (SN74F161ANSR, SN74F161AD, SN74F161ADR) are ROHS3 compliant. The original 74F161ASJ RoHS status is not specified in the provided data. All parts maintain REACH Unaffected status and Moisture Sensitivity Level 1 (Unlimited).

Q: Which substitute should be selected for high-volume production? A: SN74F161ANSR and SN74F161ADR are both active products suitable for high-volume production. SN74F161ANSR is recommended for designs using the 0.209" wide 16-SOIC package. SN74F161ADR is recommended for designs using the 0.154" wide 16-SOIC package. Both are available in Tape & Reel format for automated assembly.