TPS79628DCQR Equivalent & Substitute Parts

Part Overview

The TPS79628DCQR 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 equivalent substitute components that maintain functional and electrical compatibility for ongoing production and maintenance applications.

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
Protection Features	Over Current, Over Temperature, Reverse Polarity, UVLO
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TPS79628DCQR are qualified based on the following electrical and mechanical criteria:

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
Surface mount packaging with compatible pinout and footprint
Positive fixed output configuration
Enable control feature
Integrated protection against over-current and thermal conditions
ROHS3 compliance and equivalent regulatory status

The TLV75728PDBVR meets these substitution criteria while offering improved quiescent current characteristics and enhanced PSRR performance across the specified frequency range.

Parameter Comparison

Parameter	TPS79628DCQR	TLV75728PDBVR
Manufacturer	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	2.8V	2.8V
Output Current	1A	1A
Input Voltage (Max)	5.5V	5.5V
Dropout Voltage (Max)	0.37V @ 1A	0.65V @ 1A
Quiescent Current	385 µA	40 µA
PSRR	59dB ~ 42dB (100Hz ~ 100kHz)	52dB (1kHz ~ 1MHz)
Operating Temperature	-40°C to 125°C	-40°C to 125°C
Package / Case	SOT-223-6	SOT-23-5
Control Features	Enable	Enable
Protection Features	Over Current, Over Temperature, Reverse Polarity, UVLO	Current Limit, Thermal Shutdown, UVLO
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active

Engineering Selection Recommendations

The TLV75728PDBVR is the qualified substitute for the TPS79628DCQR based on electrical parameter equivalence and regulatory compliance. Both devices are manufactured by Texas Instruments and maintain ROHS3 compliance with equivalent REACH and ECCN classifications.

The TLV75728PDBVR offers the advantage of Active product status, ensuring continued availability and support. The substitute exhibits significantly lower quiescent current (40 µA versus 385 µA), which provides improved power efficiency in battery-powered or low-power standby applications.

The primary design consideration is the increased dropout voltage of the TLV75728PDBVR (0.65V versus 0.37V at 1A). Applications requiring minimum input-to-output voltage differential must account for this parameter difference. The package transition from SOT-223-6 to SOT-23-5 requires PCB layout modification and verification of thermal management capability for the specific application.

Frequently Asked Questions (FAQ)

Q: Can the TLV75728PDBVR directly replace the TPS79628DCQR without circuit modification?

A: Electrical substitution is possible due to matching output voltage, output current, input voltage range, and operating temperature specifications. However, PCB layout changes are required due to different package types (SOT-223-6 versus SOT-23-5). Thermal performance must be evaluated for applications operating at maximum current output.

Q: What is the impact of the increased dropout voltage in the TLV75728PDBVR?

A: The TLV75728PDBVR has a maximum dropout voltage of 0.65V at 1A compared to 0.37V for the TPS79628DCQR. This means the minimum input voltage required to maintain regulated 2.8V output is approximately 3.45V for the substitute versus 3.17V for the original part. Applications with input voltages below 4.6V may require circuit redesign.

Q: Are there package compatibility considerations?

A: Yes. The TPS79628DCQR uses SOT-223-6 packaging while the TLV75728PDBVR uses SOT-23-5 packaging. These packages have different pinout configurations and physical dimensions. PCB redesign is necessary, and thermal dissipation characteristics differ between packages.

Q: What are the advantages of the TLV75728PDBVR substitute?

A: The TLV75728PDBVR offers Active product status with ongoing manufacturer support, significantly reduced quiescent current (40 µA versus 385 µA) for improved efficiency, and extended moisture sensitivity level (MSL 1 Unlimited versus MSL 2 1 Year).

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the TPS79628DCQR and TLV75728PDBVR are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS codes (8542.39.0001).

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