TUSB544IRNQT Equivalent & Substitute Parts

Part Overview

The TUSB544IRNQT is a 4-channel USB Type-C buffer and redriver IC manufactured by Texas Instruments, housed in a 40-WQFN package with exposed pad. This active component conditions high-speed differential signals for USB Type-C applications, featuring input equalization and output de-emphasis capabilities. The device operates at 8.1 Gbps maximum data rate with 10.0 ns delay time and is compliant with ROHS3 and REACH standards. As an active component in signal conditioning applications, substitute parts may be required due to inventory constraints, application-specific performance requirements, or design optimization needs.

Key Parameters

Parameter	TUSB544IRNQT
Manufacturer	Texas Instruments
Type	Buffer, ReDriver
Number of Channels	4
Data Rate (Max)	8.1 Gbps
Delay Time	10.0 ns
Signal Conditioning	Input Equalization, Output De-Emphasis
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	40-WFQFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TUSB544IRNQT is determined by the following critical parameters: supply voltage compatibility (3V ~ 3.6V), surface mount packaging with exposed pad, buffer/redriver functionality, signal conditioning capabilities (input equalization and output de-emphasis), and active product status with ROHS3 compliance.

The substitute parts listed—MAX14950CTO+, MAX14954ETO+, and MAX4950ACTX+—share the core electrical characteristics of the main part: identical supply voltage range, equivalent signal conditioning features, and compliance certifications. However, these substitutes differ in channel count, data rate specifications, delay time, operating temperature ranges, and physical package dimensions. These differences establish distinct application boundaries and must be evaluated against specific circuit requirements.

Parameter Comparison

Parameter	TUSB544IRNQT	MAX14950CTO+	MAX14954ETO+	MAX4950ACTX+
Manufacturer	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Type	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver	Buffer, ReDriver
Number of Channels	4	4	4	2
Signal Conditioning	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis	Input Equalization, Output De-Emphasis
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Delay Time	10.0 ns	160 ps	160 ps	280 ps
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	40-WFQFN Exposed Pad	42-WFQFN Exposed Pad	42-WFQFN Exposed Pad	36-WFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, meeting baseline regulatory and supply chain requirements.

MAX14950CTO+ and MAX14954ETO+ are 4-channel devices matching the TUSB544IRNQT channel count. MAX14954ETO+ extends the operating temperature range to -40°C ~ 85°C, aligning with the main part's industrial temperature specification. MAX14950CTO+ operates within 0°C ~ 70°C, suitable for commercial temperature applications. Both devices feature significantly reduced delay time (160 ps versus 10.0 ns), which may impact signal timing in delay-sensitive applications.

MAX4950ACTX+ is a 2-channel device, reducing channel count by half. This part is applicable only when circuit topology requires fewer channels. Operating temperature range is limited to 0°C ~ 70°C.

Package dimensions differ across all substitutes. Physical board layout constraints and PCB routing requirements must be evaluated against the specific package footprints provided in supplier device specifications.

Frequently Asked Questions (FAQ)

Q: Can MAX14950CTO+ directly replace TUSB544IRNQT in all applications?

A: MAX14950CTO+ shares 4-channel configuration, supply voltage range, and signal conditioning features. However, operating temperature range differs (0°C ~ 70°C versus -40°C ~ 85°C), and delay time is significantly lower (160 ps versus 10.0 ns). Application requirements must be evaluated against these parameters.

Q: What is the primary difference between MAX14954ETO+ and MAX14950CTO+?

A: Both are 4-channel devices with identical delay time (160 ps) and signal conditioning capabilities. MAX14954ETO+ operates across -40°C ~ 85°C, while MAX14950CTO+ is rated 0°C ~ 70°C. Supply current differs: MAX14954ETO+ draws 205 mA versus MAX14950CTO+ at 328 mA.

Q: When should MAX4950ACTX+ be considered?

A: MAX4950ACTX+ is a 2-channel device suitable only for applications requiring two channels instead of four. Operating temperature is limited to 0°C ~ 70°C. Package dimensions are 36-TQFN (6x6) versus the main part's 40-WQFN (6x4).

Q: Are all substitute parts pin-compatible with TUSB544IRNQT?

A: No. Package types differ: TUSB544IRNQT uses 40-WQFN, while substitutes use 42-TQFN (MAX14950CTO+, MAX14954ETO+) or 36-TQFN (MAX4950ACTX+). Pin count and footprint are not identical. PCB redesign is required for substitution.

Q: Do all parts meet the same compliance standards?

A: Yes. All listed parts are ROHS3 compliant, REACH unaffected, and classified as ECCN EAR99 with HTSUS code 8542.39.0001. Moisture sensitivity level is 1 (Unlimited) for all devices.

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