SN74AXC2T45DCTR Equivalent & Substitute Parts

Part Overview

The SN74AXC2T45DCTR is a voltage level translator integrated circuit manufactured by Texas Instruments. This bidirectional translator operates as a single circuit with two channels, designed to facilitate signal translation between different voltage domains. The device supports data rates up to 380 Mbps and operates across supply voltages from 0.65 V to 3.6 V on both VCCA and VCCB rails. The part is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent functional performance, electrical specifications, and mechanical compatibility can be maintained across alternative manufacturers and package configurations.

Key Parameters

Parameter	Value
Translator Type	Voltage Level
Channel Type	Bidirectional
Number of Circuits	1
Channels per Circuit	2
Voltage - VCCA	0.65 V ~ 3.6 V
Voltage - VCCB	0.65 V ~ 3.6 V
Output Type	Tri-State, Non-Inverted
Data Rate	380 Mbps
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74AXC2T45DCTR are identified based on functional equivalence across the following critical parameters:

Functional Equivalence Criteria:

Translator Type: Voltage Level
Channel Type: Bidirectional
Number of Circuits: 1
Channels per Circuit: 2
Output Type: Tri-State, Non-Inverted
Operating Temperature Range: -40°C ~ 125°C (TA)
Mounting Type: Surface Mount
RoHS3 Compliance

Voltage Domain Compatibility: Substitutes are grouped into two categories based on supply voltage ranges:

Low-Voltage Domain (0.65 V ~ 3.6 V): Parts maintaining the original voltage specification range, including 74AVC and 74AVCH series devices from Nexperia and NXP.
Extended Voltage Domain (1.2 V ~ 5.5 V): Parts with broader voltage specifications suitable for applications requiring higher supply voltages, including 74LVC and 74LVCH series devices.

Data Rate Considerations: The original part specifies 380 Mbps. Substitute parts with equal or higher data rates (420 Mbps, 500 Mbps) maintain or exceed performance specifications. Parts with lower data rates are excluded from substitution.

Package Compatibility: Substitutes are available in multiple surface-mount packages including 8-VSSOP, 8-XSON, and 10-XQFN configurations. Package selection depends on PCB layout requirements and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Translator Type	Channels	VCCA Range	VCCB Range	Data Rate	Temp Range	Package	RoHS3
SN74AXC2T45DCTR	Texas Instruments	Voltage Level	2	0.65-3.6V	0.65-3.6V	380 Mbps	-40 to 125°C	8-LSSOP	Yes
74AVC2T45DC,125	Nexperia USA Inc.	Voltage Level	2	0.8-3.6V	0.8-3.6V	500 Mbps	-40 to 125°C	8-VSSOP	Yes
74AVC2T45GN,115	NXP USA Inc.	Voltage Level	2	0.8-3.6V	0.8-3.6V	500 Mbps	-40 to 125°C	8-XSON	Yes
74AVCH2T45DC,125	Nexperia USA Inc.	Voltage Level	2	0.8-3.6V	0.8-3.6V	500 Mbps	-40 to 125°C	8-VSSOP	Yes
74AVCH2T45GT,115	Nexperia USA Inc.	Voltage Level	2	0.8-3.6V	0.8-3.6V	500 Mbps	-40 to 125°C	8-XSON	Yes
74LVC2T45DC-Q100H	Nexperia USA Inc.	Voltage Level	2	1.2-5.5V	1.2-5.5V	420 Mbps	-40 to 125°C	8-VSSOP	Yes
74LVCH2T45DC-Q100H	Nexperia USA Inc.	Voltage Level	2	1.2-5.5V	1.2-5.5V	420 Mbps	-40 to 125°C	8-VSSOP	Yes
74AVC2T245GUX	Nexperia USA Inc.	Translation Transceiver	2	0.8-3.6V	0.8-3.6V	Not Specified	-40 to 125°C	10-XQFN	Yes
FXL2T245L10X	Fairchild Semiconductor	Translation Transceiver	2	1.1-3.6V	1.1-3.6V	Not Specified	-40 to 85°C	10-UFQFN	Not Specified
FXL2TD245L10X	Fairchild Semiconductor	Voltage Level	2	1.1-3.6V	1.1-3.6V	Not Specified	-40 to 85°C	10-UFQFN	Not Specified
FXMA2102L8X	onsemi	Voltage Level	2	1.65-5.5V	1.65-5.5V	37 MHz	-40 to 85°C	8-UFQFN	Yes

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 74AVC2T45DC,125 and 74AVCH2T45DC,125 from Nexperia USA Inc. are direct functional equivalents to the SN74AXC2T45DCTR. Both parts maintain identical channel configuration (1 circuit, 2 bidirectional channels), tri-state non-inverted output topology, and full operating temperature range (-40°C to 125°C). These parts exceed the original data rate specification at 500 Mbps versus 380 Mbps. Both are RoHS3 compliant with MSL 1 rating. The voltage specification range (0.8 V ~ 3.6 V) is compatible with the original 0.65 V ~ 3.6 V specification for applications operating above 0.8 V.

Alternative Package Options:

The 74AVC2T45GN,115 and 74AVCH2T45GT,115 provide equivalent electrical performance in 8-XSON package configurations. These parts are suitable for applications requiring smaller footprint or different PCB layout constraints while maintaining all functional specifications.

Extended Voltage Domain Substitutes:

The 74LVC2T45DC-Q100H and 74LVCH2T45DC-Q100H are qualified to AEC-Q100 automotive standards and support extended supply voltage ranges (1.2 V ~ 5.5 V). These parts are appropriate for applications requiring higher supply voltages or automotive-grade qualification. Data rate specification is 420 Mbps, which exceeds the original 380 Mbps requirement.

Limited Compatibility Substitutes:

The 74AVC2T245GUX operates within compatible voltage ranges but is classified as a Translation Transceiver rather than a Voltage Level Translator. The FXL2T245L10X and FXL2TD245L10X from Fairchild Semiconductor support lower operating temperature ranges (-40°C to 85°C) compared to the original specification (-40°C to 125°C). The FXMA2102L8X from onsemi operates at significantly lower data rates (37 MHz) and is not suitable for high-speed applications.

Compliance Verification:

All recommended primary and alternative substitutes maintain RoHS3 compliance and MSL 1 rating. Automotive-grade parts (74LVC2T45DC-Q100H, 74LVCH2T45DC-Q100H) carry AEC-Q100 qualification. ECCN and HTSUS classifications remain consistent across all substitute options.

Frequently Asked Questions (FAQ)

Q: Can the 74AVC2T45DC,125 directly replace the SN74AXC2T45DCTR in existing designs?

A: The 74AVC2T45DC,125 is functionally equivalent for applications operating at supply voltages of 0.8 V or higher. The minimum voltage specification increases from 0.65 V to 0.8 V. If the original design operates below 0.8 V on either supply rail, this substitute is not appropriate. All other electrical and functional parameters are compatible.

Q: What is the difference between 74AVC and 74AVCH series translators?

A: Both series provide identical voltage level translation functionality with bidirectional 2-channel configuration. The 74AVCH series is a variant designation from Nexperia. Electrical specifications, data rates, and operating ranges are equivalent between the two series for corresponding part numbers.

Q: Are the 10-pin package alternatives (74AVC2T245GUX, FXL2T245L10X) suitable substitutes?

A: These parts provide 2-channel bidirectional translation but are packaged in 10-pin configurations compared to the original 8-pin package. Physical footprint and pinout differ significantly. These alternatives are suitable only if PCB layout can accommodate the larger package and if pinout compatibility is verified against the original design schematic.

Q: Why do some substitute parts have lower operating temperature ranges?

A: The FXL2T245L10X and FXL2TD245L10X from Fairchild Semiconductor specify maximum operating temperature of 85°C compared to the original 125°C specification. These parts are not suitable for applications requiring the full -40°C to 125°C temperature range. Verify application temperature requirements before selection.

Q: What is the significance of AEC-Q100 qualification on the 74LVC2T45DC-Q100H and 74LVCH2T45DC-Q100H?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and qualification. These parts are appropriate for automotive applications requiring certified component qualification. Non-automotive applications do not require this qualification but may benefit from the additional reliability assurance.

Q: Can the FXMA2102L8X replace the SN74AXC2T45DCTR?

A: The FXMA2102L8X is not a suitable substitute. The data rate specification is 37 MHz, which is significantly lower than the original 380 Mbps specification. This part is appropriate only for low-speed applications. Additionally, the operating temperature range is limited to -40°C to 85°C.

Q: How do I verify package compatibility when selecting a substitute?

A: Confirm that the substitute part package (8-VSSOP, 8-XSON, 10-XQFN, etc.) matches the PCB footprint and layout requirements of the original design. Verify pinout compatibility by cross-referencing the datasheet pin assignments. Surface-mount packages with different dimensions or pin counts require PCB redesign.

Q: Are all substitute parts RoHS3 compliant?

A: All primary substitute recommendations (74AVC2T45DC,125; 74AVCH2T45DC,125; 74AVC2T45GN,115; 74AVCH2T45GT,115; 74LVC2T45DC-Q100H; 74LVCH2T45DC-Q100H) are RoHS3 compliant. The Fairchild Semiconductor parts (FXL2T245L10X, FXL2TD245L10X) do not specify RoHS status in the provided data. Verify RoHS compliance requirements for your application before final selection.

Q: What is the difference between tri-state and open-drain output types?

A: Tri-state outputs can drive high, low, or high-impedance states. Open-drain outputs can only drive low or high-impedance states and require external pull-up resistors for high-level output. The original part and all recommended substitutes feature tri-state non-inverted outputs. The FXMA2102L8X features open-drain output and is not directly compatible.

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