TPS79628DCQ Equivalent & Substitute Parts

Part Overview

The TPS79628DCQ is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. It delivers 1A output current at a fixed 2.8V output voltage with a maximum dropout voltage of 0.37V at full load. The device is housed in a SOT-223-6 surface mount package and includes integrated protection features for over-current, over-temperature, reverse polarity, and under-voltage lockout conditions.

This part has reached Last Time Buy status, making it necessary to identify functionally equivalent alternatives for new designs and ongoing production requirements. The TLV75728PDBVR serves as the manufacturer-recommended substitute, offering comparable electrical performance in a different package configuration.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.8V
Output Current	1A
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.37V @ 1A
Output Configuration	Positive Fixed
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-223-6
Protection Features	Over Current, Over Temperature, Reverse Polarity, UVLO
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TPS79628DCQ is determined by the following critical electrical and mechanical parameters:

Fixed output voltage of 2.8V
Output current capability of 1A minimum
Maximum input voltage of 5.5V or greater
Operating temperature range of -40°C to 125°C
Positive fixed output configuration
Surface mount technology
Enable control feature
Protection against over-current, over-temperature, and under-voltage conditions
RoHS3 compliance

The TLV75728PDBVR meets all substitution criteria. While it uses a different package footprint (SOT-23-5 versus SOT-223-6), the electrical specifications remain compatible for applications where board layout can accommodate the alternative package geometry.

Parameter Comparison

Parameter	TPS79628DCQ	TLV75728PDBVR	Compatibility
Manufacturer	Texas Instruments	Texas Instruments	Same
Output Voltage (Fixed)	2.8V	2.8V	Identical
Output Current	1A	1A	Identical
Input Voltage (Max)	5.5V	5.5V	Identical
Dropout Voltage (Max)	0.37V @ 1A	0.65V @ 1A	Substitute higher
Output Configuration	Positive Fixed	Positive Fixed	Identical
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Identical
Package / Case	SOT-223-6	SOT-23-5	Different footprint
Control Features	Enable	Enable	Identical
Protection Features	Over Current, Over Temperature, Reverse Polarity, UVLO	Current Limit, Thermal Shutdown, UVLO	Functionally equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Last Time Buy	Active	Substitute active

Engineering Selection Recommendations

The TLV75728PDBVR is the appropriate substitute for the TPS79628DCQ based on the following factors:

Both devices are manufactured by Texas Instruments and maintain identical output voltage, output current, and input voltage specifications. Both operate across the full -40°C to 125°C temperature range and include enable control functionality with integrated protection mechanisms.

The primary design consideration is the package transition from SOT-223-6 to SOT-23-5. This requires PCB layout modification, as the SOT-23-5 package has a smaller footprint and different pin configuration. The TLV75728PDBVR exhibits a higher dropout voltage (0.65V versus 0.37V at 1A), which may impact thermal performance in applications operating near the maximum input voltage specification.

Both parts maintain ROHS3 compliance and are suitable for applications requiring regulatory adherence. The TLV75728PDBVR carries Active product status, ensuring long-term availability and continued manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the TLV75728PDBVR directly replace the TPS79628DCQ without PCB modification?

A: No. The TLV75728PDBVR uses a SOT-23-5 package while the TPS79628DCQ uses SOT-223-6. These packages have different pin counts, pin spacing, and footprints. PCB layout redesign is required for substitution.

Q: Are the electrical specifications identical between these two parts?

A: The output voltage, output current, input voltage, operating temperature range, and control features are identical. The dropout voltage differs: TPS79628DCQ is 0.37V at 1A, while TLV75728PDBVR is 0.65V at 1A. This difference may affect thermal design in low-headroom applications.

Q: What protection features does each device provide?

A: Both devices include under-voltage lockout (UVLO) protection. The TPS79628DCQ includes over-current, over-temperature, and reverse polarity protection. The TLV75728PDBVR includes current limit and thermal shutdown. Both provide equivalent functional protection against fault conditions.

Q: Are both parts RoHS compliant?

A: Yes. Both the TPS79628DCQ and TLV75728PDBVR are ROHS3 compliant and REACH unaffected.

Q: Why is the TPS79628DCQ listed as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing production. The TLV75728PDBVR, with Active product status, represents the recommended path forward for new designs and production continuity.

Q: What is the quiescent current difference between these devices?

A: The TPS79628DCQ specifies quiescent current (Iq) of 385 µA. The TLV75728PDBVR specifies maximum supply current of 40 µA. The TLV75728PDBVR exhibits significantly lower quiescent current, which may provide power consumption benefits in battery-powered applications.

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