74LVC161D,112 Equivalent & Substitute Parts

Part Overview

The 74LVC161D,112 is a 4-bit binary counter IC manufactured by Nexperia USA Inc., designed for synchronous counting applications with positive edge triggering. This component features asynchronous reset capability and operates across a wide supply voltage range of 1.2 V to 3.6 V. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where this specific part number is unavailable.

Substiute Parts

74LVC161D,112

Nexperia USA Inc.In Stock: 121574LVC161D,112 Datasheet

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SN74LV161AD

Texas InstrumentsIn Stock: 3441SN74LV161AD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74LVC161D,112 is determined by the following critical parameters:

Functional Equivalence Criteria:

• Logic type: Binary counter with 4-bit configuration
• Counter direction: Up counting only
• Reset mechanism: Asynchronous reset capability
• Timing architecture: Synchronous operation
• Trigger mechanism: Positive edge triggering

Electrical Compatibility Criteria:

• Package type: 16-SOIC form factor with identical 0.154" (3.90mm) width
• Mounting technology: Surface mount configuration
• Pin count and arrangement: 16-pin SOIC package

Environmental & Compliance Criteria:

• RoHS3 compliance requirement
• MSL rating of 1 (Unlimited moisture sensitivity)
• Operating temperature range compatibility

The SN74LV161AD from Texas Instruments qualifies as a substitute based on matching functional architecture (4-bit binary counter, asynchronous reset, synchronous timing, positive edge trigger), identical package geometry (16-SOIC), and equivalent compliance certifications (ROHS3, MSL 1). Voltage supply range and maximum count rate differ between devices; these differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 74LVC161D,112 is classified as obsolete. The SN74LV161AD represents a functionally equivalent alternative that maintains the core counter architecture, package geometry, and compliance requirements.

Selection Considerations Based on Provided Data:

Both devices carry ROHS3 compliance and MSL 1 ratings, satisfying regulatory and environmental requirements. The SN74LV161AD carries a Last Time Buy status, indicating limited future availability.

The primary electrical differences are:

• Count rate: 74LVC161D,112 supports 150 MHz; SN74LV161AD supports 95 MHz
• Supply voltage range: 74LVC161D,112 operates 1.2 V ~ 3.6 V; SN74LV161AD operates 2 V ~ 5.5 V
• Operating temperature maximum: 74LVC161D,112 rated to 125°C; SN74LV161AD rated to 85°C

Component selection must verify that application timing requirements do not exceed 95 MHz and that system supply voltage falls within the 2 V ~ 5.5 V range when using the SN74LV161AD.

Frequently Asked Questions (FAQ)

Q: Can the SN74LV161AD directly replace the 74LVC161D,112 in existing designs?

A: Physical and functional compatibility exists due to identical 16-SOIC package geometry and matching counter architecture. Electrical compatibility requires verification that the application operates within the SN74LV161AD's specified count rate (95 MHz maximum) and supply voltage range (2 V ~ 5.5 V).

Q: What are the key differences between these two parts?

A: The devices differ in maximum count rate (150 MHz vs. 95 MHz), supply voltage operating range (1.2 V ~ 3.6 V vs. 2 V ~ 5.5 V), and maximum operating temperature (125°C vs. 85°C). Functional counter operation, package type, and compliance certifications are identical.

Q: Are both parts available for new designs?

A: The 74LVC161D,112 is obsolete. The SN74LV161AD carries Last Time Buy status, indicating limited future availability. Long-term design strategies should evaluate alternative counter architectures or manufacturers.

Q: Do these parts require different PCB layouts?

A: No. Both devices use the 16-SOIC package with identical pin spacing (0.154" width). PCB footprints are interchangeable.

Q: What compliance certifications apply to both parts?

A: Both the 74LVC161D,112 and SN74LV161AD are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings. Both carry REACH Unaffected status and EAR99 export classification.