TPS79428DCQ Equivalent & Substitute Parts

Part Overview

The TPS79428DCQ is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.8V output applications with 250mA current capacity in SOT-223-6 surface mount packaging. This device is classified as Last Time Buy, indicating end-of-life status. Finding equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term product support.

Substiute Parts

TPS79428DCQ

Texas InstrumentsIn Stock: 989TPS79428DCQ Datasheet

Current PartRFQ

TPS7A2028PDBVR

Texas InstrumentsIn Stock: 31797TPS7A2028PDBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPS79428DCQ is based on the following critical parameters that must be maintained or exceeded:

• Output voltage fixed at 2.8V
• Output current capability of at least 250mA
• Maximum input voltage tolerance of 5.5V or greater
• Positive output configuration with single regulator
• Enable control feature
• Protection features including Over Current, Over Temperature, and Under Voltage Lockout (UVLO)
• Operating temperature range of -40°C ~ 125°C
• RoHS3 compliance
• Surface mount technology

The TPS7A2028PDBVR meets these substitution criteria while offering enhanced specifications in certain areas, making it a direct functional equivalent for the end-of-life TPS79428DCQ.

Parameter Comparison

Engineering Selection Recommendations

The TPS7A2028PDBVR is the manufacturer-recommended substitute for the end-of-life TPS79428DCQ. Selection of this substitute is supported by the following factors:

• Both devices maintain identical 2.8V fixed output voltage specification
• The substitute provides 300mA output current, exceeding the original 250mA requirement
• Input voltage tolerance is increased from 5.5V to 6V maximum
• Quiescent current is significantly reduced from 220 µA to 15 µA, improving power efficiency
• Both devices maintain identical operating temperature range and RoHS3 compliance
• The substitute is in Active product status, ensuring long-term availability and supply chain continuity
• Core protection features (Over Current, Over Temperature, UVLO) are preserved

The primary design consideration is the package change from SOT-223-6 to SOT-23-5. This requires PCB layout modification and verification of thermal performance in the application circuit. The SOT-23-5 package is smaller and may require thermal management evaluation for the specific application.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A2028PDBVR directly replace the TPS79428DCQ without PCB modifications?

A: No. While the electrical specifications are compatible, the package differs (SOT-23-5 versus SOT-223-6). PCB footprint redesign is required. Pin configuration must be verified against the respective datasheets before implementation.

Q: What is the impact of the package change on thermal performance?

A: The SOT-23-5 package is smaller than SOT-223-6. Thermal performance depends on PCB copper area, trace routing, and application current draw. At the specified 250mA operating point, thermal analysis should be performed to confirm adequate heat dissipation in the target application.

Q: Are there differences in protection features between these devices?

A: The TPS79428DCQ includes Reverse Polarity protection, while the TPS7A2028PDBVR does not list this feature. If reverse polarity protection is critical to the application, external circuit protection may be required when using the substitute.

Q: Does the lower quiescent current of the substitute affect circuit design?

A: The reduction from 220 µA to 15 µA improves overall system power efficiency, particularly in battery-powered or low-power applications. No circuit redesign is required; this represents a performance improvement.

Q: What is the significance of the product status change from Last Time Buy to Active?

A: Active status ensures the TPS7A2028PDBVR will remain available for future production runs and provides long-term supply chain security, eliminating the obsolescence risk associated with the Last Time Buy TPS79428DCQ.

Q: Are both devices RoHS3 compliant?

A: Yes. Both the TPS79428DCQ and TPS7A2028PDBVR are ROHS3 compliant, maintaining regulatory compliance for applications requiring RoHS certification.