TPS73643DBVRG4 Equivalent & Substitute Parts

Part Overview

The TPS73643DBVRG4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This device delivers 400mA output current with a fixed 4.3V output and operates across an industrial temperature range of -40°C to 125°C. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

TPS73643DBVRG4

Texas InstrumentsIn Stock: 1039TPS73643DBVRG4 Datasheet

Current PartRFQ

TPS74515PQWDRBRQ1

Texas InstrumentsIn Stock: 12173TPS74515PQWDRBRQ1 Datasheet

MFR RecommendedRFQ

TPS73643DBVR

Texas InstrumentsIn Stock: 8128TPS73643DBVR Datasheet

Parametric EquivalentRFQ

TPS73643DBVT

Texas InstrumentsIn Stock: 1739TPS73643DBVT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TPS73643DBVRG4 is determined by the following critical parameters:

Parametric Equivalents share identical electrical specifications: 4.3V fixed output, 400mA output current, 0.2V maximum dropout voltage at 400mA, 550 µA quiescent current, SOT-23-5 package, and identical protection features (Over Current, Over Temperature, Reverse Polarity). These parts differ only in packaging format (Cut Tape vs. Tape & Reel) and product status.

Functional Alternatives provide similar voltage regulation capability but with different electrical parameters. These parts maintain positive fixed output configuration and surface mount packaging but may differ in output current rating, quiescent current, dropout voltage, and package size. Functional alternatives are suitable when the application can accommodate the modified electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

TPS73643DBVR and TPS73643DBVT are parametric equivalents of the TPS73643DBVRG4. Both parts maintain identical electrical specifications and package type (SOT-23-5). The primary distinction is packaging format: TPS73643DBVR is supplied in Cut Tape (CT) & Digi-Reel format, while TPS73643DBVT is supplied in Tape & Reel (TR) format. Both parts share obsolete product status with the main part. Selection between these equivalents depends on procurement and assembly requirements.

For Functional Alternative (Active Product):

TPS74515PQWDRBRQ1 is an active product from Texas Instruments suitable for applications where the TPS73643DBVRG4 cannot be sourced. This part provides higher output current capability (500mA vs. 400mA), significantly lower quiescent current (36 µA vs. 550 µA), and automotive-grade qualification (AEC-Q100). However, the TPS74515PQWDRBRQ1 has a different fixed output voltage (1.5V vs. 4.3V), different package type (8-SON 3x3 vs. SOT-23-5), and different maximum input voltage (6V vs. 5.5V). This alternative is applicable only when the application circuit can accommodate the 1.5V output specification and 8-SON package footprint.

Frequently Asked Questions (FAQ)

Q: Can TPS73643DBVR or TPS73643DBVT be used as direct replacements for TPS73643DBVRG4?

A: Yes. TPS73643DBVR and TPS73643DBVT are parametric equivalents with identical electrical specifications and package type. The difference is packaging format only. TPS73643DBVR uses Cut Tape & Digi-Reel format, while TPS73643DBVT uses Tape & Reel format. Both are suitable for direct PCB replacement.

Q: Why is TPS74515PQWDRBRQ1 listed as a substitute if it has a different output voltage?

A: TPS74515PQWDRBRQ1 is a functional alternative for applications where the TPS73643DBVRG4 cannot be sourced and the circuit design can be modified to accept 1.5V output instead of 4.3V. This part is active (not obsolete) and offers improved specifications including lower quiescent current and higher output current capability. It is not a direct replacement but an alternative for new designs or redesigned applications.

Q: What are the key differences between the parametric equivalents?

A: TPS73643DBVR, TPS73643DBVT, and TPS73643DBVRG4 share identical electrical performance and SOT-23-5 package specifications. The differences are limited to packaging format and inventory availability. All three parts are obsolete products from Texas Instruments.

Q: Can I use TPS74515PQWDRBRQ1 without circuit modification?

A: No. TPS74515PQWDRBRQ1 has a fixed output voltage of 1.5V, compared to 4.3V for the TPS73643DBVRG4. Additionally, the package type differs (8-SON 3x3 vs. SOT-23-5), requiring PCB layout changes. Circuit redesign is necessary to accommodate this alternative.

Q: What compliance certifications apply to these parts?

A: TPS73643DBVRG4, TPS73643DBVR, and TPS73643DBVT are ROHS3 compliant. TPS74515PQWDRBRQ1 holds AEC-Q100 automotive qualification. All parts operate across -40°C to 125°C temperature range and include Over Current and Over Temperature protection.

Q: Which substitute should I select for new production?

A: For new production requiring the 4.3V output specification, TPS73643DBVR or TPS73643DBVT are the appropriate choices as parametric equivalents. For applications where output voltage can be modified to 1.5V, TPS74515PQWDRBRQ1 is preferred as an active product with ongoing manufacturer support and automotive qualification.