REG103GA-3.3 Equivalent & Substitute Parts

Part Overview

The REG103GA-3.3 is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 3.3V output at 500mA in a SOT-223-6 surface mount package. This device functions as a positive fixed output regulator with integrated over-current and over-temperature protection. The part is currently in Last Time Buy status, indicating end-of-life transition. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 3.3V regulation in compact form factors.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	500mA
Input Voltage (Max)	15V
Dropout Voltage (Max)	0.28V @ 500mA
Quiescent Current	0.7 mA
Operating Temperature Range	-40°C to 85°C
Package Type	SOT-223-6
Protection Features	Over Current, Over Temperature
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the REG103GA-3.3 is determined by the following critical parameters:

Fixed output voltage of 3.3V
Minimum output current capability of 500mA
Maximum input voltage rating of at least 15V
Surface mount technology compatibility
Integrated protection features (over-current and over-temperature minimum)
RoHS3 compliance and REACH unaffected status

The TPS7A2633DRVR qualifies as a manufacturer-recommended substitute based on these criteria. While the substitute operates across a wider temperature range (-40°C to 125°C) and features an enhanced package (6-WSON), it maintains functional equivalence for the specified output voltage and current requirements.

Parameter Comparison

Parameter	REG103GA-3.3	TPS7A2633DRVR	Compatibility Notes
Output Voltage (Fixed)	3.3V	3.3V	Identical
Output Current	500mA	500mA	Identical
Input Voltage (Max)	15V	18V	Substitute rated higher
Dropout Voltage (Max)	0.28V @ 500mA	0.33V @ 500mA	Substitute slightly higher
Quiescent Current	0.7 mA	4.5 µA	Substitute significantly lower
Operating Temperature Range	-40°C to 85°C	-40°C to 125°C	Substitute rated wider
Package Type	SOT-223-6	6-WSON (2x2)	Different package, PCB layout modification required
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, UVLO	Substitute includes additional UVLO protection
Control Features	Enable	Enable, Power Good	Substitute includes Power Good output
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Last Time Buy	Active	Substitute actively manufactured

Engineering Selection Recommendations

The TPS7A2633DRVR is the manufacturer-recommended substitute for the REG103GA-3.3. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The substitute is actively manufactured, providing long-term supply availability compared to the Last Time Buy status of the original part.

The TPS7A2633DRVR offers enhanced specifications including lower quiescent current (4.5 µA versus 0.7 mA), extended operating temperature range to 125°C, and additional protection features (UVLO) and control features (Power Good output). These improvements provide design flexibility without compromising core functionality.

Package transition from SOT-223-6 to 6-WSON (2x2) requires PCB layout modification. The substitute's smaller footprint may provide space optimization benefits in compact designs.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A2633DRVR directly replace the REG103GA-3.3 without PCB modifications?

A: No. The TPS7A2633DRVR uses a 6-WSON (2x2) package while the REG103GA-3.3 uses SOT-223-6. PCB layout changes are required, including pad pattern redesign and trace routing adjustments.

Q: What are the key electrical differences between these parts?

A: The substitute features lower quiescent current (4.5 µA vs 0.7 mA), slightly higher dropout voltage (0.33V vs 0.28V at 500mA), and higher maximum input voltage rating (18V vs 15V). Both deliver identical 3.3V at 500mA output.

Q: Does the TPS7A2633DRVR provide additional protection?

A: Yes. The substitute includes UVLO (Under-Voltage Lockout) protection in addition to the over-current and over-temperature protection present in the original part.

Q: Is the Power Good output feature on the TPS7A2633DRVR required for compatibility?

A: No. The Power Good output is an additional feature. If not required by the application, it can remain unconnected without affecting regulator operation.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the REG103GA-3.3 and TPS7A2633DRVR are ROHS3 compliant and REACH unaffected.

Q: Why is the substitute's quiescent current significantly lower?

A: The TPS7A2633DRVR employs more advanced semiconductor process technology, resulting in lower standby power consumption. This benefits battery-powered and low-power applications.

Q: What is the impact of the extended temperature range on the substitute?

A: The TPS7A2633DRVR operates reliably to 125°C junction temperature, compared to 85°C for the original part. This provides margin for high-temperature environments and thermal stress conditions.

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