TPS51312DRCT Equivalent & Substitute Parts

Part Overview

The TPS51312DRCT is an active-status buck switching regulator IC manufactured by Texas Instruments, designed for positive adjustable output applications. This Power Management IC delivers 3A output current with a fixed switching frequency of 900kHz and operates across an input voltage range of 3.1V to 5.5V. The device features synchronous rectification and is packaged in a 10-VFDFN Exposed Pad surface mount configuration. Substitute parts are identified to address inventory availability, extended operating temperature ranges, or alternative packaging preferences while maintaining functional compatibility within specified electrical parameters.

Substiute Parts

TPS51312DRCT

Texas InstrumentsIn Stock: 1639TPS51312DRCT Datasheet

Current PartRFQ

RT8068AZQW

Richtek USA Inc.In Stock: 35233RT8068AZQW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TPS51312DRCT is determined by the following critical parameters:

Core Functional Requirements:

• Step-Down (Buck) topology with positive adjustable output
• Output current capability of 3A minimum
• Synchronous rectification capability
• Surface mount packaging with exposed pad thermal management

Electrical Compatibility Criteria:

• Input voltage range must encompass or overlap the 3.1V to 5.5V specification
• Output voltage adjustability must support the 0.6V to 3.3V range
• Switching frequency operation within typical PMIC standards (typically 500kHz to 2MHz)

Mechanical & Environmental Compatibility:

• Package footprint compatibility (10-pin VFDFN or WFDFN variants with 3x3mm dimensions)
• Surface mount technology
• RoHS3 compliance required
• Operating temperature range must support the application's thermal requirements

The RT8068AZQW qualifies as a manufacturer-recommended substitute based on these criteria, with noted differences in input voltage floor (2.7V vs. 3.1V), output voltage ceiling (5.5V vs. 3.3V), switching frequency (1MHz vs. 900kHz), and operating temperature range (-10°C to 105°C vs. -40°C to 85°C).

Parameter Comparison

Engineering Selection Recommendations

Both the TPS51312DRCT and RT8068AZQW are active-status products with ROHS3 compliance and REACH unaffected status, qualifying them for equivalent use in applications meeting the specified electrical and thermal requirements.

Selection Criteria:

The TPS51312DRCT is the primary choice for applications requiring the lower input voltage floor of 3.1V, the restricted output voltage ceiling of 3.3V, or the extended low-temperature operating range to -40°C. The MSL1 moisture sensitivity rating provides unlimited shelf life without baking requirements.

The RT8068AZQW is suitable as a substitute when lower input voltage operation (2.7V minimum) is beneficial, higher output voltage capability (5.5V maximum) is required, or the higher operating temperature ceiling (105°C) is advantageous. The MSL3 rating requires 168-hour baking before reflow if shelf life exceeds specified limits.

Both devices maintain identical 3A output current capacity and synchronous rectification functionality. Package footprints are compatible within the 10-pin VFDFN/WFDFN 3x3mm family, though PCB layout verification is necessary to confirm pin-to-pin compatibility.

Frequently Asked Questions (FAQ)

Q: Can the RT8068AZQW directly replace the TPS51312DRCT on an existing PCB?

A: Package compatibility exists within the 10-pin VFDFN/WFDFN 3x3mm family. Pin-to-pin verification against the respective datasheets is required to confirm footprint alignment and signal routing compatibility.

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

A: The RT8068AZQW extends the input voltage range to 2.7V (versus 3.1V minimum for TPS51312DRCT) and supports output voltages up to 5.5V (versus 3.3V maximum for TPS51312DRCT). Switching frequency differs at 1MHz versus 900kHz. Both maintain 3A output current and synchronous rectification.

Q: Which part is better for low-temperature applications?

A: The TPS51312DRCT operates to -40°C, while the RT8068AZQW operates to -10°C minimum. For applications below -10°C, the TPS51312DRCT is required.

Q: What is the significance of the MSL rating difference?

A: TPS51312DRCT carries MSL1 (unlimited shelf life), while RT8068AZQW carries MSL3 (168-hour baking requirement if shelf life is exceeded). This affects component storage and handling procedures.

Q: Are both parts suitable for high-temperature environments?

A: The RT8068AZQW supports operation to 105°C (junction temperature), exceeding the TPS51312DRCT's 85°C rating. For applications requiring sustained operation above 85°C, the RT8068AZQW is the appropriate selection.

Q: Do both parts require identical PCB layout considerations?

A: Both devices feature exposed pad thermal management in 10-pin VFDFN/WFDFN packages. Layout principles for thermal dissipation, input/output filtering, and feedback network routing apply to both. Specific component placement and trace routing must follow the respective manufacturer datasheets.