SN74AS161DR Equivalent & Substitute Parts

Part Overview

The SN74AS161DR is a 4-bit binary counter IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component functions as a synchronous counter with asynchronous reset capability, designed for digital logic applications requiring counting operations at frequencies up to 40 MHz. The SN74AS161DR is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The identification of compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

SN74AS161DR

Texas InstrumentsIn Stock: 1035SN74AS161DR Datasheet

Current PartRFQ

SN74ALS161BDR

Texas InstrumentsIn Stock: 2623SN74ALS161BDR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AS161DR is determined by strict equivalence across the following critical parameters:

• Logic Type: Binary Counter (1 element, 4-bit configuration)
• Trigger Type: Positive Edge
• Reset: Asynchronous
• Timing: Synchronous
• Count Rate: 40 MHz minimum
• Voltage Supply Range: 4.5 V ~ 5.5 V
• Operating Temperature Range: 0°C ~ 70°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

The SN74ALS161BDR meets all specified electrical and mechanical parameters, providing functional and pin-compatible substitution for the obsolete SN74AS161DR.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS161BDR serves as the direct substitute for the obsolete SN74AS161DR. Both components maintain identical electrical specifications, pin configurations, and package dimensions. The SN74ALS161BDR carries Active product status, ensuring ongoing availability and manufacturing support. Both parts satisfy ROHS3 compliance and REACH regulatory requirements, supporting modern supply chain and environmental standards. Selection of the SN74ALS161BDR eliminates obsolescence risk while maintaining full functional compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS161BDR directly replace the SN74AS161DR in existing designs?

A: Yes. The SN74ALS161BDR is electrically and mechanically equivalent to the SN74AS161DR. Both components share identical pin configurations, package dimensions (16-SOIC), supply voltage range (4.5 V ~ 5.5 V), operating temperature range (0°C ~ 70°C), and functional specifications (4-bit binary counter, 40 MHz count rate, positive edge trigger, asynchronous reset).

Q: What is the primary difference between these two parts?

A: The SN74AS161DR is classified as Obsolete, while the SN74ALS161BDR maintains Active product status. The SN74ALS161BDR represents the current production alternative, ensuring supply chain continuity and long-term availability.

Q: Are there any compliance or certification differences?

A: No. Both the SN74AS161DR and SN74ALS161BDR are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory and environmental compliance requirements are satisfied by either component.

Q: Does package type affect substitution?

A: No. Both parts are supplied in 16-SOIC surface mount packages with identical physical dimensions (0.154" width, 3.90mm). PCB layout and assembly processes require no modification.

Q: What inventory considerations apply to these parts?

A: The SN74ALS161BDR is available in higher inventory quantities (2533 Pcs) compared to the SN74AS161DR (981 Pcs), reflecting its Active status and continued production. For new designs, the SN74ALS161BDR is the recommended selection.