TPS73643DBVT Equivalent & Substitute Parts

Part Overview

The TPS73643DBVT 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 in a surface-mount SOT-23-5 package. The device is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. This reference provides engineering-grade alternatives based on strict parametric compatibility.

Substiute Parts

TPS73643DBVT

Texas InstrumentsIn Stock: 1739TPS73643DBVT Datasheet

Current PartRFQ

TLV75801PDBVR

Texas InstrumentsIn Stock: 52276TLV75801PDBVR Datasheet

MFR RecommendedRFQ

TPS73643DBVR

Texas InstrumentsIn Stock: 8128TPS73643DBVR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TPS73643DBVT is determined by the following critical parameters:

Parametric Equivalence Criteria:

• Package compatibility: SOT-23-5 (SC-74A, SOT-753)
• Output voltage: Fixed 4.3V positive output
• Output current capability: Minimum 400mA
• Input voltage range: Maximum 5.5V or higher
• Dropout voltage: 0.2V or lower at rated current
• Operating temperature range: -40°C to 125°C
• Surface-mount technology
• Control features: Enable function
• Protection: Over Current, Over Temperature

Substitute Categories:

1. Parametric Equivalent – Identical electrical specifications and package, different packaging format (Cut Tape vs. Tape & Reel)
2. Functional Substitute – Different output type (adjustable vs. fixed) but compatible package, voltage range, and current rating; requires external resistor network configuration

Parameter Comparison

Engineering Selection Recommendations

TPS73643DBVR (Parametric Equivalent): This part is the direct parametric equivalent to the TPS73643DBVT, with identical electrical specifications and package configuration. The only difference is the packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). Both parts are obsolete, but TPS73643DBVR maintains higher inventory availability (8100 pcs vs. 1662 pcs). Selection of this substitute requires no circuit modifications and provides pin-for-pin compatibility. Both parts carry ROHS3 compliance and identical regulatory certifications.

TLV75801PDBVR (Functional Substitute): The TLV75801PDBVR is an active-status alternative with adjustable output voltage capability (0.55V to 5.5V). It shares the same SOT-23-5 package and positive output configuration. Key differences include higher output current (500mA vs. 400mA), higher maximum input voltage (6V vs. 5.5V), and significantly lower quiescent current (35 µA vs. 550 µA). The adjustable output requires external resistor network configuration to achieve the 4.3V fixed output. Higher dropout voltage (0.88V @ 500mA) may impact applications with tight input-to-output voltage margins. This part is currently in active production with substantial inventory (52200 pcs), ensuring long-term availability. ROHS3 compliance and regulatory status are equivalent to the main part.

Frequently Asked Questions (FAQ)

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

A: Yes. TPS73643DBVR is a parametric equivalent with identical electrical specifications, output voltage, current rating, and package type. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). No circuit modifications are required. Pin configuration and functional behavior are identical.

Q: What is the key limitation of using TLV75801PDBVR as a substitute?

A: The TLV75801PDBVR has an adjustable output voltage (0.55V to 5.5V) rather than fixed 4.3V. To achieve 4.3V output, external resistor divider networks must be added to the feedback network. Additionally, dropout voltage is higher (0.88V @ 500mA vs. 0.2V @ 400mA), which may be problematic in applications with limited input-to-output voltage headroom.

Q: Are all three parts RoHS compliant?

A: Yes. TPS73643DBVT, TPS73643DBVR, and TLV75801PDBVR are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Why is TPS73643DBVR preferred over TLV75801PDBVR for direct substitution?

A: TPS73643DBVR is a parametric equivalent requiring zero circuit modifications, while TLV75801PDBVR requires external component configuration to set output voltage. For applications where the fixed 4.3V output is critical and no design changes are permitted, TPS73643DBVR is the appropriate choice.

Q: What is the inventory status of each substitute?

A: TPS73643DBVT (main part): 1662 pcs. TPS73643DBVR (parametric equivalent): 8100 pcs. TLV75801PDBVR (functional substitute): 52200 pcs. The functional substitute offers the highest availability for long-term production support.

Q: Are there temperature range differences between the substitutes?

A: All three parts operate across -40°C to 125°C. Operating temperature ranges are identical and suitable for industrial and extended-temperature applications.

Q: What protection features does each part provide?

A: TPS73643DBVT and TPS73643DBVR provide Over Current, Over Temperature, and Reverse Polarity protection. TLV75801PDBVR provides Over Current, Over Temperature, and UVLO (Under Voltage Lock-Out) protection. All three include comprehensive protection mechanisms suitable for power management applications.