74VHC161SJ Binary Counter IC Equivalent & Substitute Parts

Part Overview

The 74VHC161SJ is a 4-bit binary counter IC manufactured by onsemi, designed for synchronous counting applications with positive edge triggering. This component features a single 4-bit counting element with asynchronous reset capability and operates across a wide supply voltage range of 2V to 5.5V. The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

74VHC161SJ

onsemiIn Stock: 660274VHC161SJ Datasheet

Current PartRFQ

SN74LV161ANSR

Texas InstrumentsIn Stock: 755SN74LV161ANSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74VHC161SJ is determined by strict equivalence across the following critical parameters:

• Logic Type: Binary Counter (1 element, 4-bit configuration)
• Counting Direction: Up
• Reset Architecture: Asynchronous
• Timing Mode: Synchronous
• Trigger Mechanism: Positive Edge
• Supply Voltage Range: 2V ~ 5.5V (minimum overlap requirement)
• Operating Temperature Range: -40°C ~ 85°C (minimum overlap requirement)
• Package Footprint: 16-SOIC (0.209", 5.30mm Width)
• Mounting Technology: Surface Mount

The SN74LV161ANSR from Texas Instruments satisfies all substitution criteria. While the count rate differs (95 MHz versus 125 MHz), this parameter does not restrict substitution eligibility, as the substitute meets or exceeds the functional requirements for binary counting applications within the specified voltage and temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

The SN74LV161ANSR is the qualified substitute for the 74VHC161SJ. Selection is supported by the following factors:

• Functional Equivalence: Both devices implement identical 4-bit binary counter architecture with asynchronous reset and synchronous positive-edge triggering.
• Electrical Compatibility: Supply voltage range (2V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) are identical.
• Package Compatibility: Both devices use 16-SOIC surface-mount packaging with identical footprint dimensions (0.209", 5.30mm Width).
• Product Status: The SN74LV161ANSR maintains active production status, ensuring long-term availability and supply chain continuity.
• Compliance: The SN74LV161ANSR is RoHS3 compliant, providing regulatory advantage over the obsolete 74VHC161SJ.

Frequently Asked Questions (FAQ)

Q: Can the SN74LV161ANSR directly replace the 74VHC161SJ in existing designs?

A: Yes. Both devices share identical pin configurations, package footprints, and functional specifications for binary counting operations. No circuit modifications are required for direct substitution.

Q: What is the significance of the count rate difference (125 MHz vs. 95 MHz)?

A: The count rate represents the maximum frequency at which the counter can operate. The SN74LV161ANSR operates at 95 MHz, which is lower than the 74VHC161SJ at 125 MHz. This difference does not restrict substitution for applications operating below 95 MHz. Applications requiring operation above 95 MHz must retain the original 74VHC161SJ or identify alternative solutions.

Q: Are there packaging differences between these devices?

A: No. Both the 74VHC161SJ and SN74LV161ANSR use 16-SOIC surface-mount packaging with identical footprint specifications (0.209", 5.30mm Width). PCB layouts and assembly processes require no modification.

Q: What is the advantage of selecting the SN74LV161ANSR over the 74VHC161SJ?

A: The SN74LV161ANSR is in active production status, ensuring reliable long-term availability and supply chain support. The 74VHC161SJ is obsolete, presenting sourcing challenges and potential supply discontinuation. Additionally, the SN74LV161ANSR is RoHS3 compliant, meeting current environmental and regulatory standards.

Q: Are the supply voltage ranges identical?

A: Yes. Both devices operate across the identical supply voltage range of 2V to 5.5V and share the same operating temperature range of -40°C to 85°C.