TPS54331QDRQ1 Equivalent & Substitute Parts

Part Overview

The TPS54331QDRQ1 is a buck switching regulator IC manufactured by Texas Instruments, designed for step-down voltage conversion with positive adjustable output. This automotive-grade power management IC delivers 3A output current and operates across a wide input voltage range of 4.6V to 28V, with adjustable output voltage from 0.8V to 25V. The device is actively produced and AEC-Q100 qualified for automotive applications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within the same functional category.

Substiute Parts

TPS54331QDRQ1

Texas InstrumentsIn Stock: 19208TPS54331QDRQ1 Datasheet

Current PartRFQ

AP64351QSP-13

Diodes IncorporatedIn Stock: 100144AP64351QSP-13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPS54331QDRQ1 is determined by the following critical parameters:

• Topology & Function: Buck (step-down) converter with positive adjustable output configuration
• Output Voltage Capability: Minimum output voltage of 0.8V and maximum output voltage meeting or exceeding 25V
• Input Voltage Range: Minimum input voltage of 4.6V or lower; maximum input voltage of 28V or higher
• Output Current Rating: Minimum 3A continuous output current capability
• Switching Frequency: 570kHz operation for consistent performance characteristics
• Package Compatibility: 8-SOIC form factor with 0.154" (3.90mm) width for direct PCB footprint compatibility
• Automotive Qualification: AEC-Q100 certification for automotive-grade reliability
• Operating Temperature Range: -40°C to 125°C ambient operation

The AP64351QSP-13 from Diodes Incorporated meets these substitution criteria with compatible electrical specifications and identical package form factor.

Parameter Comparison

Engineering Selection Recommendations

Both the TPS54331QDRQ1 and AP64351QSP-13 are active, production-status components with AEC-Q100 automotive qualification and ROHS3 compliance. The AP64351QSP-13 provides extended input voltage capability (3.8V to 40V versus 4.6V to 28V) and higher output voltage range (0.8V to 40V versus 0.8V to 25V), along with increased output current rating (4.6A versus 3A). The AP64351QSP-13 includes an integrated synchronous rectifier, which the TPS54331QDRQ1 does not feature. Both devices operate at identical switching frequency (570kHz) and share the same 8-SOIC package footprint with matching thermal and mechanical characteristics. Selection between these parts depends on specific application voltage and current requirements within the defined operating ranges.

Frequently Asked Questions (FAQ)

Q: Can the AP64351QSP-13 directly replace the TPS54331QDRQ1 on existing PCBs?

A: Yes. Both devices use identical 8-SOIC (0.154", 3.90mm Width) packaging with the same pinout and footprint compatibility. The AP64351QSP-13 includes an exposed pad for enhanced thermal performance, which is compatible with standard 8-SOIC PCB layouts.

Q: What are the key electrical differences between these parts?

A: The AP64351QSP-13 supports higher input voltage (up to 40V versus 28V), higher output voltage (up to 40V versus 25V), and higher output current (4.6A versus 3A). Both operate at 570kHz switching frequency with adjustable output voltage starting at 0.8V. The AP64351QSP-13 includes a synchronous rectifier for improved efficiency.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the TPS54331QDRQ1 and AP64351QSP-13 are AEC-Q100 qualified and rated for automotive-grade operation across -40°C to 125°C ambient temperature range.

Q: What is the significance of the synchronous rectifier in the AP64351QSP-13?

A: The integrated synchronous rectifier in the AP64351QSP-13 reduces conduction losses compared to the TPS54331QDRQ1, which uses a standard diode rectifier. This results in improved power efficiency and reduced thermal dissipation in the AP64351QSP-13.

Q: Are there any input voltage compatibility considerations?

A: The TPS54331QDRQ1 operates from 4.6V minimum input; the AP64351QSP-13 operates from 3.8V minimum input. For applications requiring operation below 3.8V input voltage, the TPS54331QDRQ1 is required. For applications within the 3.8V to 28V range, both parts are compatible.

Q: Do both parts meet the same compliance standards?

A: Yes. Both devices are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8542.39.0001.