NLSX4373DR2G Equivalent & Substitute Parts

Part Overview

The NLSX4373DR2G is a voltage level translator IC manufactured by onsemi, designed for bidirectional signal translation between different voltage domains. This device features 1 circuit with 2 channels per circuit, supporting data rates up to 20 Mbps with auto-direction sensing capability. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across voltage translation, channel configuration, and output characteristics.

Key Parameters

Parameter	NLSX4373DR2G
Translator Type	Voltage Level
Channel Type	Bidirectional
Number of Circuits	1
Channels per Circuit	2
Voltage - VCCA	1.5 V ~ 5.5 V
Voltage - VCCB	1.5 V ~ 5.5 V
Output Type	Open Drain, Tri-State
Data Rate	20 Mbps
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the NLSX4373DR2G is determined by the following critical parameters:

Functional Requirements:

Translator type must be voltage level translation
Channel configuration must support bidirectional, 1 circuit, 2 channels per circuit
Output type must include tri-state capability for bus compatibility

Electrical Compatibility:

Supply voltage ranges must encompass or match the 1.5 V ~ 5.5 V requirement for both VCCA and VCCB
Data rate capability must meet or exceed 20 Mbps minimum
Operating temperature range must support -40°C ~ 85°C minimum

Physical & Compliance:

Surface mount packaging required
RoHS3 compliance mandatory
MSL rating of 1 or equivalent

Substitute parts are grouped into two categories: direct functional equivalents with enhanced performance specifications (74AVC and 74AVCH series) and compatible alternatives with extended voltage ranges (74LVC and 74LVCH series). All listed substitutes maintain the core 1-circuit, 2-channel bidirectional architecture with tri-state output capability.

Parameter Comparison

Part Number	Manufacturer	Translator Type	Channels per Circuit	Voltage - VCCA	Voltage - VCCB	Output Type	Data Rate	Operating Temp	Package	Product Status
NLSX4373DR2G	onsemi	Voltage Level	2	1.5 V ~ 5.5 V	1.5 V ~ 5.5 V	Tri-State	20 Mbps	-40°C ~ 85°C	8-SOIC	Obsolete
74AVC2T245GUX	Nexperia USA Inc.	Translation Transceiver	2	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	3-State	—	-40°C ~ 125°C	10-XQFN	Active
74AVC2T45DC,125	Nexperia USA Inc.	Voltage Level	2	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	Tri-State	500 Mbps	-40°C ~ 125°C	8-VSSOP	Active
74AVC2T45DP-Q100H	Nexperia USA Inc.	Voltage Level	2	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	Tri-State	500 Mbps	-40°C ~ 125°C	8-TSSOP	Active
74AVC2T45GN,115	NXP USA Inc.	Voltage Level	2	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	Tri-State	500 Mbps	-40°C ~ 125°C	8-XSON	Active
74AVCH2T45DC,125	Nexperia USA Inc.	Voltage Level	2	0.8 V ~ 3.6 V	0.8 V ~ 3.6 V	Tri-State	500 Mbps	-40°C ~ 125°C	8-VSSOP	Active
74AVCH2T45GN,115	NXP Semiconductors	Voltage Level	2	—	—	Tri-State	—	—	—	Active
74LVC2T45DC-Q100H	Nexperia USA Inc.	Voltage Level	2	1.2 V ~ 5.5 V	1.2 V ~ 5.5 V	Tri-State	420 Mbps	-40°C ~ 125°C	8-VSSOP	Active
74LVC2T45GN,115	Nexperia USA Inc.	Voltage Level	2	1.2 V ~ 5.5 V	1.2 V ~ 5.5 V	Tri-State	420 Mbps	-40°C ~ 125°C	8-XSON	Active
74LVCH2T45DC-Q100H	Nexperia USA Inc.	Voltage Level	2	1.2 V ~ 5.5 V	1.2 V ~ 5.5 V	Tri-State	420 Mbps	-40°C ~ 125°C	8-VSSOP	Active
74LVCH2T45GN,115	NXP Semiconductors	Voltage Level	2	—	—	Tri-State	—	—	—	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 74LVC2T45 series (74LVC2T45DC-Q100H, 74LVC2T45GN,115, 74LVCH2T45DC-Q100H, 74LVCH2T45GN,115) are the preferred substitutes. These parts maintain the 1.2 V ~ 5.5 V supply voltage range, which encompasses the original 1.5 V ~ 5.5 V specification. All are active products with RoHS3 compliance and MSL rating of 1. The 74LVC and 74LVCH variants support 420 Mbps data rates, exceeding the 20 Mbps requirement of the NLSX4373DR2G. The automotive-qualified versions (74LVC2T45DC-Q100H and 74LVCH2T45DC-Q100H) carry AEC-Q100 certification.

Secondary Substitutes (Performance Enhancement):

The 74AVC2T45 series (74AVC2T45DC,125, 74AVC2T45DP-Q100H, 74AVC2T45GN,115) and 74AVCH2T45 variants offer superior performance with 500 Mbps data rates. However, these parts operate at 0.8 V ~ 3.6 V supply voltage, which does not encompass the full 1.5 V ~ 5.5 V range of the original part. Selection of 74AVC variants is appropriate only when system voltage requirements are confirmed to remain within 0.8 V ~ 3.6 V.

Packaging Considerations:

The original NLSX4373DR2G uses 8-SOIC packaging. Substitute parts are available in multiple surface mount packages: 8-VSSOP, 8-TSSOP, 8-XSON, and 10-XQFN. PCB layout modifications may be required for package transitions. The 8-VSSOP and 8-XSON packages provide the smallest footprints for space-constrained applications.

Compliance & Certification:

All listed substitutes maintain RoHS3 compliance and MSL rating of 1. Automotive applications requiring AEC-Q100 qualification should select 74AVC2T45DP-Q100H, 74LVC2T45DC-Q100H, or 74LVCH2T45DC-Q100H.

Frequently Asked Questions (FAQ)

Q: Can the 74AVC2T45 series directly replace the NLSX4373DR2G in all applications?

A: The 74AVC2T45 series provides functional substitution for bidirectional voltage translation with 2 channels. However, the supply voltage range is 0.8 V ~ 3.6 V, which does not cover the full 1.5 V ~ 5.5 V specification of the original part. Substitution is valid only when system voltages remain within 0.8 V ~ 3.6 V.

Q: What is the difference between 74LVC and 74LVCH variants?

A: Both 74LVC and 74LVCH series maintain identical electrical specifications: 1.2 V ~ 5.5 V supply voltage, 420 Mbps data rate, and bidirectional 2-channel configuration. The primary difference is packaging availability and inventory levels. Selection between them depends on PCB layout requirements and package compatibility.

Q: Are package changes required when substituting the NLSX4373DR2G?

A: Yes. The original part uses 8-SOIC packaging. Substitute parts are available in 8-VSSOP, 8-TSSOP, 8-XSON, and 10-XQFN packages. PCB redesign is necessary to accommodate the new package footprint, pinout, and thermal characteristics.

Q: Which substitute part is recommended for automotive applications?

A: For automotive applications requiring AEC-Q100 qualification, select 74AVC2T45DP-Q100H, 74LVC2T45DC-Q100H, or 74LVCH2T45DC-Q100H. These parts carry automotive-grade certification and are qualified for automotive operating conditions.

Q: Does the higher data rate of 74AVC and 74AVCH series (500 Mbps vs. 20 Mbps) affect compatibility?

A: No. Higher data rate capability is backward compatible with lower-speed applications. The 74AVC and 74AVCH series can operate at 20 Mbps without performance degradation. However, voltage range limitations of the 74AVC series must be considered for applications requiring the full 1.5 V ~ 5.5 V range.

Q: What is the significance of the -Q100H suffix in part numbers?

A: The -Q100H suffix indicates AEC-Q100 automotive qualification. These parts meet automotive reliability and quality standards and are suitable for automotive applications. Parts without this suffix are industrial-grade components.

Q: Can multiple substitute parts be used interchangeably on the same PCB?

A: No. Each substitute part has a unique package and pinout. Once a specific substitute is selected and the PCB is designed for that package, all components on that PCB must use the same part number and package type to ensure consistent assembly and functionality.

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