SN74LS161ADRG4 Equivalent & Substitute Parts

Part Overview

The SN74LS161ADRG4 is a 4-bit binary counter IC manufactured by Texas Instruments, designed for synchronous counting applications with positive edge triggering. This component features asynchronous reset capability and operates at a maximum count rate of 25 MHz within a supply voltage range of 4.75 V to 5.25 V. The device is packaged in a 16-SOIC surface mount configuration.

The SN74LS161ADRG4 has been discontinued at DiGi Electronics. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring 4-bit binary counter functionality with identical electrical and mechanical specifications.

Substiute Parts

SN74LS161ADRG4

Texas InstrumentsIn Stock: 856SN74LS161ADRG4 Datasheet

Current PartRFQ

SN74LS161ADR

Texas InstrumentsIn Stock: 10258SN74LS161ADR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS161ADRG4 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must maintain identical specifications in the following areas:

Logic function and counter architecture (4-bit binary counter, 1 element, up direction, positive edge trigger, asynchronous reset, synchronous timing)

Electrical performance (25 MHz count rate, 4.75 V to 5.25 V supply voltage, 0°C to 70°C operating temperature range)

Physical form factor (16-SOIC surface mount package with 0.154" width, 3.90mm)

Compliance certifications (ROHS3 Compliant, REACH Unaffected, EAR99 ECCN classification)

The SN74LS161ADR meets all these criteria and qualifies as a parametric equivalent. The primary distinction between the main part and substitute is packaging format and product availability status.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS161ADR is a direct parametric equivalent to the SN74LS161ADRG4. Both parts share identical electrical specifications, functional characteristics, and compliance certifications. The substitute part is currently in active production status, ensuring long-term availability and supply chain stability.

The primary difference between the two parts is packaging format: the main part is supplied in tube packaging, while the substitute is supplied in Tape & Reel (TR) format. This distinction affects handling, storage, and automated assembly processes but does not impact electrical performance or functional compatibility.

Selection of the SN74LS161ADR is appropriate for applications requiring the same counter functionality, electrical performance, and operating conditions as the discontinued SN74LS161ADRG4. Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings.

Frequently Asked Questions (FAQ)

Q: Are the SN74LS161ADRG4 and SN74LS161ADR electrically identical?

A: Yes. Both parts are manufactured by Texas Instruments and share identical electrical specifications, including 25 MHz count rate, 4.75 V to 5.25 V supply voltage range, and 0°C to 70°C operating temperature range. They perform the same 4-bit binary counter function with positive edge triggering and asynchronous reset.

Q: What is the difference between these two part numbers?

A: The primary difference is packaging format. The SN74LS161ADRG4 is supplied in tube packaging, while the SN74LS161ADR is supplied in Tape & Reel (TR) format. This affects how the components are packaged and handled during assembly but does not affect electrical performance or pin compatibility.

Q: Can I use the SN74LS161ADR as a direct replacement for the SN74LS161ADRG4?

A: Yes, the SN74LS161ADR is a direct functional and electrical replacement. Pin configuration, electrical characteristics, and operating parameters are identical. Tape & Reel packaging is compatible with standard automated assembly equipment.

Q: Are both parts RoHS compliant?

A: Yes. Both the SN74LS161ADRG4 and SN74LS161ADR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the SN74LS161ADRG4 discontinued?

A: The SN74LS161ADRG4 has been discontinued at DiGi Electronics. The SN74LS161ADR remains in active production and is the recommended substitute for ongoing designs and production requirements.

Q: What is the moisture sensitivity level for these parts?

A: Both parts have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without special moisture control measures during storage and handling.