74LVC646AD,112 Equivalent & Substitute Parts

Part Overview

The 74LVC646AD,112 is a non-inverting transceiver logic IC manufactured by NXP USA Inc., designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates across a supply voltage range of 1.2V to 3.6V and is housed in a 24-SOIC package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74LVC646AD,112

NXP USA Inc.In Stock: 83374LVC646AD,112 Datasheet

Current PartRFQ

SN74LVTH652DW

Texas InstrumentsIn Stock: 819SN74LVTH652DW Datasheet

DirectRFQ

SN74LVC646ADW

Texas InstrumentsIn Stock: 1302SN74LVC646ADW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74LVC646AD,112 is determined by the following critical parameters:

• Logic type classification: Transceiver, Non-Inverting
• Bit configuration: 1 Element, 8 Bits per Element
• Output architecture: 3-State capability
• Package compatibility: 24-SOIC form factor (0.295", 7.50mm Width)
• Supply voltage range: Must support the operational envelope of the original design
• Output current specifications: Drive capability for high and low states
• Operating temperature range: Thermal performance requirements

Two substitute parts meet these criteria and are presented below.

Parameter Comparison

Engineering Selection Recommendations

SN74LVC646ADW (Texas Instruments) is the manufacturer-recommended substitute. This part maintains identical output current specifications (24mA, 24mA) and belongs to the same 74LVC logic series as the original NXP component. The supply voltage range is 1.65V to 3.6V, which covers the upper portion of the original specification. Operating temperature range is -40°C to 85°C. This part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for new designs and ongoing production support.

SN74LVTH652DW (Texas Instruments) is an alternative substitute with enhanced output current capability (32mA high, 64mA low). This part operates within a narrower supply voltage range of 2.7V to 3.6V and shares the same 24-SOIC package footprint. The 74LVTH series represents a different logic family variant. This option is appropriate for applications requiring higher output drive capability within the specified voltage envelope.

Both substitutes are ROHS3 compliant, carry unlimited MSL ratings, and are housed in the identical 24-SOIC package form factor, ensuring direct mechanical and electrical compatibility at the board level.

Frequently Asked Questions (FAQ)

Q: Can the SN74LVC646ADW directly replace the 74LVC646AD,112 in existing designs?

A: Yes. The SN74LVC646ADW maintains the same logic type, bit configuration, output type, output current specifications, and package form factor. The supply voltage range of 1.65V to 3.6V encompasses typical operating conditions for most applications using the original part. Pin-for-pin compatibility is assured.

Q: What is the key difference between the SN74LVC646ADW and SN74LVTH652DW substitutes?

A: The primary differences are output current capability and supply voltage range. The SN74LVC646ADW matches the original 24mA output current specification and operates from 1.65V. The SN74LVTH652DW provides higher output current (32mA high, 64mA low) but requires a minimum supply voltage of 2.7V. Both maintain the 8-bit non-inverting transceiver architecture and 3-state output configuration.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts—the original 74LVC646AD,112 and both substitutes—use the 24-SOIC package with identical dimensions (0.295", 7.50mm Width). Direct board-level substitution is mechanically feasible without layout modifications.

Q: Do the substitute parts meet the same compliance standards as the original?

A: Yes. Both SN74LVC646ADW and SN74LVTH652DW are ROHS3 compliant with unlimited moisture sensitivity ratings (MSL 1), matching the original part's compliance profile. Both are currently in active production status, ensuring long-term availability.

Q: Which substitute should be selected for new designs?

A: The SN74LVC646ADW is the manufacturer-recommended choice for new designs, as it maintains the closest electrical specification match to the original 74LVC646AD,112, including identical output current ratings and broader supply voltage range. The SN74LVTH652DW is appropriate when higher output drive capability is required within the 2.7V to 3.6V operating window.