74LVC646APW,118 Equivalent & Substitute Parts

Part Overview

The 74LVC646APW,118 is a non-inverting transceiver logic IC manufactured by NXP USA Inc., designed for 8-bit bidirectional data transfer with 3-state output capability. Operating across a supply voltage range of 1.2V to 3.6V, this component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The 24-TSSOP surface mount package provides compact integration for modern electronic assemblies.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LVC646APW,118
Manufacturer	NXP USA Inc.
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
Voltage - Supply	1.2V ~ 3.6V
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LVC646APW,118 is determined by the following critical parameters: logic type (transceiver, non-inverting), functional configuration (1 element, 8 bits per element), output type (3-state), output current capability (24mA high and low), supply voltage compatibility, operating temperature range, and package form factor. Substitute parts must maintain identical or superior electrical performance within these specified boundaries.

The substitute parts identified fall into two categories:

Category 1: Direct Functional Equivalents (Same Base Product Number) Parts sharing the 74LVC646 base product number with active product status and compatible electrical specifications.

Category 2: Alternative Logic Function Parts with different logic function but compatible electrical parameters and package options.

Parameter Comparison

Parameter	74LVC646APW,118 (NXP)	SN74LVC646APW (TI)	SN74LVC646ADBR (TI)	SN74LVC646APWR (TI)	SN74LVTH574DW (TI)
Manufacturer	NXP USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Transceiver, Non-Inverting	Flip Flop, D-Type
Number of Elements	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8
Output Type	3-State	3-State	3-State	3-State	Tri-State, Non-Inverted
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	32mA, 64mA
Voltage - Supply	1.2V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	24-TSSOP	24-TSSOP	24-SSOP	24-TSSOP	20-SOIC
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

SN74LVC646APW and SN74LVC646APWR are the preferred substitutes for the 74LVC646APW,118. Both parts maintain identical logic type, element configuration, bit width, output type, and output current specifications. These Texas Instruments components feature active product status with established supply chains. The SN74LVC646APW is packaged in 24-TSSOP with tube packaging, while SN74LVC646APWR provides the same package in tape and reel format for high-volume production. Both support the required supply voltage range of 1.65V to 3.6V and operating temperature of -40°C to 85°C. All parts maintain ROHS3 compliance and MSL 1 rating.

Secondary Substitute (Package Variant)

SN74LVC646ADBR provides functional equivalence with identical electrical specifications but in 24-SSOP package form factor (0.209", 5.30mm width versus 0.173", 4.40mm width for TSSOP). This variant is suitable only when PCB layout accommodates the larger package footprint.

Alternative Logic Function

SN74LVTH574DW represents a different logic function (D-type flip flop versus transceiver) with higher output current capability (32mA/64mA). This part is applicable only in applications where the functional difference aligns with circuit requirements and does not require bidirectional transceiver operation.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC646APW directly replace 74LVC646APW,118 without circuit modification?

A: Yes. SN74LVC646APW maintains identical logic type, element count, bit width, output type, and output current specifications. The supply voltage range difference (1.65V minimum versus 1.2V minimum) is not restrictive for standard 3.3V and 5V logic applications. Operating temperature range is -40°C to 85°C versus -40°C to 125°C; verify application requirements.

Q: What is the difference between SN74LVC646APW and SN74LVC646APWR?

A: Both parts are electrically identical. SN74LVC646APW is supplied in tube packaging, while SN74LVC646APWR is supplied in tape and reel format. Selection depends on production volume and assembly process requirements.

Q: Why is SN74LVC646ADBR listed as a substitute if the package is different?

A: SN74LVC646ADBR provides functional and electrical equivalence with 24-SSOP packaging (5.30mm width) instead of 24-TSSOP (4.40mm width). This substitute is valid only when PCB layout and assembly equipment support the larger package footprint.

Q: Is SN74LVTH574DW a suitable replacement?

A: SN74LVTH574DW is a D-type flip flop, not a transceiver. It is functionally different and suitable only in applications where the circuit design does not require bidirectional data transfer capability. Verify circuit schematic compatibility before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, consistent with the original 74LVC646APW,118 specification.

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