74LVC646APW,112 Equivalent & Substitute Parts

Part Overview

The 74LVC646APW,112 is a non-inverting transceiver 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-TSSOP package. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

74LVC646APW,112

NXP USA Inc.In Stock: 117474LVC646APW,112 Datasheet

Current PartRFQ

SN74LVTH652PWR

Texas InstrumentsIn Stock: 4004SN74LVTH652PWR Datasheet

DirectRFQ

SN74LVC646ADBR

Texas InstrumentsIn Stock: 26359SN74LVC646ADBR Datasheet

MFR RecommendedRFQ

SN74LVC646APW

Texas InstrumentsIn Stock: 1211SN74LVC646APW Datasheet

MFR RecommendedRFQ

SN74LVC646APWR

Texas InstrumentsIn Stock: 859SN74LVC646APWR Datasheet

MFR RecommendedRFQ

SN74LVC646APWT

Texas InstrumentsIn Stock: 899SN74LVC646APWT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74LVC646APW,112 is determined by the following critical parameters:

Core Functional Requirements:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 24mA, 24mA (minimum requirement)

Electrical Compatibility:

• Voltage - Supply: Must support minimum 1.2V operation; 1.65V ~ 3.6V range is acceptable
• Operating Temperature: Must support -40°C minimum; 85°C or 125°C maximum acceptable

Physical Compatibility:

• Package / Case: 24-TSSOP or 24-SSOP (both 24-pin configurations with compatible pinouts)
• Mounting Type: Surface Mount

Substitute parts are grouped into two categories: direct pin-compatible replacements in 24-TSSOP packaging, and functionally equivalent alternatives in 24-SSOP packaging with identical electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

SN74LVC646APW, SN74LVC646APWR, and SN74LVC646APWT are the preferred alternatives. These Texas Instruments parts maintain identical electrical specifications to the original 74LVC646APW,112, including 24mA output current and 24-TSSOP packaging. All three are ROHS3 compliant with MSL 1 rating. SN74LVC646APW and SN74LVC646APWR are currently in active production status, ensuring long-term availability.

Secondary Substitute (Package Variant):

SN74LVC646ADBR provides functional equivalence with identical electrical performance but uses 24-SSOP packaging (0.209" width versus 0.173" for TSSOP). This part is suitable only if PCB layout accommodates the wider package footprint. This option offers the highest inventory availability at 26,346 units.

Alternative with Enhanced Output Current:

SN74LVTH652PWR operates as a functional substitute with higher output current capability (32mA high, 64mA low) and maintains 3-state output architecture. However, this part requires minimum 2.7V supply voltage and operates to 85°C maximum, representing reduced low-voltage and temperature range performance compared to the original specification.

Compliance Status:

All substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC646APW directly replace 74LVC646APW,112 without PCB modifications?

A: Yes. SN74LVC646APW is a direct pin-compatible replacement with identical 24-TSSOP packaging, electrical specifications, and pinout. No PCB layout changes are required.

Q: What is the difference between SN74LVC646APWR and SN74LVC646APW?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: APWR is supplied in Tape & Reel format for automated assembly, while APW is supplied in Tube format for manual handling. Select based on your assembly process requirements.

Q: Is SN74LVC646ADBR compatible with designs using 24-TSSOP footprints?

A: No. SN74LVC646ADBR uses 24-SSOP packaging with a 0.209" width compared to 0.173" for TSSOP. The footprint is physically larger and requires PCB redesign. Use this part only if your PCB layout can accommodate the wider package.

Q: Can SN74LVTH652PWR be used as a drop-in replacement?

A: SN74LVTH652PWR is pin-compatible and functionally equivalent but has different electrical specifications. It requires minimum 2.7V supply (versus 1.2V for the original) and operates to 85°C maximum (versus 125°C). Use this part only if your system operates within these constraints.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 moisture sensitivity rating, matching the original part's environmental certifications.

Q: Which substitute offers the best long-term availability?

A: SN74LVC646ADBR currently has the highest inventory (26,346 units) and is in active production status. SN74LVC646APW and SN74LVC646APWR are also actively produced by Texas Instruments with substantial stock levels.