TPS73643DBVR Equivalent & Substitute Parts

Part Overview

The TPS73643DBVR is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a fixed positive output of 4.3V at 400mA with a maximum dropout voltage of 0.2V. The device is packaged in SOT-23-5 (SC-74A, SOT-753) surface mount configuration and includes integrated protection features for over-current, over-temperature, and reverse polarity conditions.

The TPS73643DBVR is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

TPS73643DBVR

Texas InstrumentsIn Stock: 8128TPS73643DBVR Datasheet

Current PartRFQ

TPS74515PQWDRBRQ1

Texas InstrumentsIn Stock: 12173TPS74515PQWDRBRQ1 Datasheet

MFR RecommendedRFQ

TPS73643DBVT

Texas InstrumentsIn Stock: 1739TPS73643DBVT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TPS73643DBVR are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output voltage configuration (Positive, Fixed)
• Output current capability (400mA minimum)
• Input voltage range compatibility (5.5V maximum or higher)
• Dropout voltage performance (0.2V or lower at rated current)
• Operating temperature range (-40°C ~ 125°C)
• Protection feature set (Over-current, Over-temperature minimum)
• Surface mount packaging availability

Substitution Categories:

Parametric Equivalent: Parts with identical or near-identical electrical specifications and the same package type. These provide direct form-fit-function replacement.

Manufacturer Recommended Substitute: Parts with enhanced specifications, different package types, or additional features that fulfill the original application requirements while offering improved performance or availability.

Parameter Comparison

Engineering Selection Recommendations

TPS73643DBVT (Parametric Equivalent): This part is a parametric equivalent to the TPS73643DBVR, offering identical electrical specifications and the same SOT-23-5 package. The primary difference is packaging format (Tape & Reel versus Cut Tape & Digi-Reel). Both parts are obsolete and ROHS3 compliant. Selection of this substitute is appropriate when the original packaging format is not a constraint and inventory availability is the determining factor.

TPS74515PQWDRBRQ1 (Manufacturer Recommended Substitute): This part is recommended by Texas Instruments as a substitute option. It differs significantly in output voltage (1.5V fixed versus 4.3V), making it suitable only for applications where the lower output voltage is acceptable. The TPS74515PQWDRBRQ1 offers enhanced features including Power Good output, Under Voltage Lockout (UVLO) protection, and automotive-grade qualification (AEC-Q100). It delivers higher output current (500mA versus 400mA) and significantly lower quiescent current (36 µA versus 550 µA). The package is 8-VDFN Exposed Pad, requiring PCB layout modifications. This part is currently active in production, ensuring long-term availability. Selection is appropriate for new designs or redesigns where the output voltage change can be accommodated and automotive-grade reliability is required.

Frequently Asked Questions (FAQ)

Q: Can TPS73643DBVT be used as a direct replacement for TPS73643DBVR?

A: Yes, with packaging format considerations. Both parts deliver identical electrical performance: 4.3V fixed output at 400mA with 0.2V maximum dropout voltage. The TPS73643DBVT is supplied in Tape & Reel format while the TPS73643DBVR is supplied in Cut Tape & Digi-Reel format. PCB footprint and soldering processes remain unchanged as both use SOT-23-5 packaging. Verify tape reel compatibility with your assembly equipment before implementation.

Q: Is TPS74515PQWDRBRQ1 a direct replacement for TPS73643DBVR?

A: No. While both are Texas Instruments linear regulators with identical operating temperature ranges and similar protection features, the TPS74515PQWDRBRQ1 has a fixed output voltage of 1.5V compared to the 4.3V of the TPS73643DBVR. This part is suitable only for applications where the lower output voltage is acceptable. Additionally, the package is 8-VDFN Exposed Pad instead of SOT-23-5, requiring PCB redesign. Use this substitute only when output voltage requirements can be modified.

Q: Why is TPS74515PQWDRBRQ1 recommended if the output voltage is different?

A: The TPS74515PQWDRBRQ1 is listed as a manufacturer-recommended substitute because it addresses the obsolescence of the TPS73643DBVR by offering an active, production-supported alternative from the same manufacturer. It is recommended for new designs or system redesigns where the output voltage specification can be adjusted. For existing designs requiring 4.3V output, the TPS73643DBVT parametric equivalent is the appropriate choice.

Q: What are the key differences in protection features between these parts?

A: The TPS73643DBVR and TPS73643DBVT both include Over-Current, Over-Temperature, and Reverse Polarity protection with Enable control. The TPS74515PQWDRBRQ1 includes Over-Current, Over-Temperature, and Under Voltage Lockout (UVLO) protection, plus Power Good output signaling. UVLO provides additional system-level protection by preventing regulator operation when input voltage falls below a specified threshold.

Q: What is the impact of quiescent current differences?

A: The TPS73643DBVR and TPS73643DBVT both draw 550 µA quiescent current. The TPS74515PQWDRBRQ1 draws only 36 µA, representing a 15-fold reduction. In battery-powered or low-power standby applications, this difference is significant. The TPS74515PQWDRBRQ1 is superior for power-sensitive designs, while the TPS73643 series is acceptable for applications where quiescent current is not a limiting factor.

Q: Are there compliance or certification differences?

A: The TPS73643DBVR and TPS73643DBVT are ROHS3 compliant with MSL 1 (Unlimited moisture sensitivity level). The TPS74515PQWDRBRQ1 carries automotive-grade qualification (AEC-Q100) and is not subject to RoHS requirements. For automotive applications, the TPS74515PQWDRBRQ1 is the appropriate choice. For consumer or industrial applications, either the TPS73643 series or TPS74515PQWDRBRQ1 may be used depending on output voltage requirements.

Q: What packaging considerations apply when switching between these parts?

A: The TPS73643DBVR and TPS73643DBVT both use SOT-23-5 packaging with identical PCB footprints, allowing direct substitution without layout changes. The TPS74515PQWDRBRQ1 uses 8-VDFN Exposed Pad packaging, which requires PCB redesign including new footprint layout, trace routing, and thermal management considerations. Verify assembly equipment compatibility with the new package before implementation.