74LVTH646WM Equivalent & Substitute Parts

Part Overview

The 74LVTH646WM is a non-inverting transceiver logic IC manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. Operating at 2.7V to 3.6V supply voltage, this component is housed in a 24-SOP package and rated for -40°C to 85°C operating temperature range. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LVTH646WM
Manufacturer	onsemi
Logic Type	Transceiver, Non-Inverting
Number of Elements	1
Number of Bits per Element	8
Output Type	3-State
Current - Output High, Low	32mA, 64mA
Voltage - Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	24-SOIC (0.295", 7.50mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74LVTH646WM is determined by strict equivalence across the following electrical and mechanical parameters:

Logic Type: Transceiver, Non-Inverting
Number of Elements: 1
Number of Bits per Element: 8
Output Type: 3-State
Current - Output High, Low: 32mA, 64mA
Voltage - Supply: 2.7V ~ 3.6V
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: 24-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed below meet these criteria without exception. Substitutes are available from Texas Instruments in the 74LVTH and 74LVT series, with active product status and RoHS3 compliance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Logic Type	Bits per Element	Output Type	Current (High/Low)	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
74LVTH646WM	onsemi	74LVTH	Transceiver, Non-Inverting	8	3-State	32mA, 64mA	2.7V ~ 3.6V	-40°C ~ 85°C	24-SOIC	Obsolete	REACH Unaffected
SN74LVTH543DW	Texas Instruments	74LVTH	Transceiver, Non-Inverting	8	3-State	32mA, 64mA	2.7V ~ 3.6V	-40°C ~ 85°C	24-SOIC	Active	ROHS3 Compliant
SN74LVTH2952DW	Texas Instruments	74LVTH	Transceiver, Non-Inverting	8	3-State	32mA, 64mA	2.7V ~ 3.6V	-40°C ~ 85°C	24-SOIC	Active	ROHS3 Compliant
SN74LVTH646DW	Texas Instruments	74LVTH	Transceiver, Non-Inverting	8	3-State	32mA, 64mA	2.7V ~ 3.6V	-40°C ~ 85°C	24-SOIC	Active	ROHS3 Compliant
SN74LVTH646DWG4	Texas Instruments	74LVTH	Transceiver, Non-Inverting	8	3-State	32mA, 64mA	2.7V ~ 3.6V	-40°C ~ 85°C	24-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74LVTH652DW	Texas Instruments	74LVTH	Transceiver, Non-Inverting	8	3-State	32mA, 64mA	2.7V ~ 3.6V	-40°C ~ 85°C	24-SOIC	Active	ROHS3 Compliant
SN74LVT543DW	Texas Instruments	74LVT	Transceiver, Non-Inverting	8	3-State	32mA, 64mA	2.7V ~ 3.6V	-40°C ~ 85°C	24-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and ongoing procurement, SN74LVTH543DW, SN74LVTH2952DW, SN74LVTH646DW, and SN74LVTH652DW are recommended as primary substitutes. These parts are manufactured by Texas Instruments, carry active product status, and are RoHS3 compliant. All meet the identical electrical and mechanical specifications of the 74LVTH646WM.

SN74LVT543DW is functionally equivalent and active, though it operates under the 74LVT series designation rather than 74LVTH. This part maintains full parametric compatibility.

SN74LVTH646DWG4 is available but carries a discontinued status at DiGi Electronics, making it less suitable for long-term supply chain planning despite meeting all technical requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74LVTH543DW directly replace 74LVTH646WM in existing designs?

A: Yes. Both parts are 8-bit non-inverting transceivers with 3-state outputs, identical supply voltage range (2.7V ~ 3.6V), matching output current specifications (32mA high, 64mA low), and the same 24-SOIC package footprint. No circuit modifications are required.

Q: What is the difference between 74LVTH and 74LVT series substitutes?

A: Both series meet the specified electrical parameters for this application. The 74LVT series (represented by SN74LVT543DW) is an earlier generation logic family. Selection between 74LVTH and 74LVT variants depends on design preference and supply chain availability, as both are functionally equivalent for this transceiver function.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitutes listed are RoHS3 compliant. The original 74LVTH646WM is REACH unaffected. All parts carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: Does package type vary among substitutes?

A: No. All substitute parts use the 24-SOIC (0.295", 7.50mm Width) surface mount package, ensuring identical PCB footprint compatibility with the original 74LVTH646WM.

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

A: SN74LVTH543DW, SN74LVTH2952DW, SN74LVTH646DW, and SN74LVTH652DW all carry active product status from Texas Instruments, providing the strongest long-term supply assurance. SN74LVTH646DWG4 should be avoided for new designs due to its discontinued status.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message