REG103GA-5G4 Equivalent & Substitute Parts

Part Overview

The REG103GA-5G4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 500mA in SOT-223-6 surface mount packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The regulator features enable control, over-current and over-temperature protection, with a maximum input voltage of 15V and dropout voltage of 0.28V at full load.

Key Parameters

Parameter	Value
Manufacturer Part Number	REG103GA-5G4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Product Status	Obsolete
Output Voltage (Fixed)	5V
Output Current	500mA
Input Voltage (Max)	15V
Dropout Voltage (Max)	0.28V @ 500mA
Package / Case	SOT-223-6
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the REG103GA-5G4 is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 500mA minimum
Surface mount packaging compatibility
Positive output configuration
Enable control feature
Over-current and over-temperature protection
RoHS3 compliance

Two substitute parts meet these criteria:

REG103GA-5 maintains identical electrical specifications and packaging (SOT-223-6) but carries a Last Time Buy status, providing a direct form-fit-function replacement with the same thermal and mechanical characteristics.

TPS7A2650DRVR provides enhanced performance with improved quiescent current (4.5µA vs 0.7mA), higher input voltage rating (18V vs 15V), extended operating temperature range (-40°C to 125°C), and additional control features (Power Good output, UVLO protection). However, it uses 6-WSON (2x2) packaging instead of SOT-223-6, requiring PCB layout modification.

Parameter Comparison

Parameter	REG103GA-5G4	REG103GA-5	TPS7A2650DRVR
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Last Time Buy	Active
Output Voltage (Fixed)	5V	5V	5V
Output Current	500mA	500mA	500mA
Input Voltage (Max)	15V	15V	18V
Dropout Voltage (Max)	0.28V @ 500mA	0.28V @ 500mA	0.33V @ 500mA
Quiescent Current	0.7mA	0.7mA	4.5µA
PSRR	65dB (120Hz)	65dB (120Hz)	75dB ~ 52dB (10Hz ~ 1kHz)
Control Features	Enable	Enable	Enable, Power Good
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, UVLO
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	SOT-223-6	SOT-223-6	6-WSON (2x2)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	2 (1 Year)	2 (1 Year)	1 (Unlimited)

Engineering Selection Recommendations

REG103GA-5 is the preferred direct replacement when PCB layout cannot be modified. It provides identical electrical performance and packaging, with RoHS3 compliance and equivalent protection features. Last Time Buy status indicates limited availability; procurement planning is necessary.

TPS7A2650DRVR is suitable for new designs or redesigns where PCB layout modification is acceptable. It offers superior performance characteristics including significantly lower quiescent current, higher input voltage tolerance, extended temperature range, and additional control features (Power Good output and UVLO protection). Active product status ensures long-term availability. The 6-WSON package requires footprint redesign but provides improved thermal performance through the exposed pad.

Selection between these substitutes depends on design constraints: REG103GA-5 for form-fit-function replacement; TPS7A2650DRVR for performance enhancement and future-proof designs.

Frequently Asked Questions (FAQ)

Q: Can REG103GA-5 be used as a direct replacement for REG103GA-5G4?

A: Yes. REG103GA-5 provides identical electrical specifications, output voltage (5V), output current (500mA), dropout voltage (0.28V @ 500mA), and SOT-223-6 packaging. Both devices feature enable control and identical protection mechanisms. The primary difference is product status: REG103GA-5G4 is obsolete while REG103GA-5 is Last Time Buy.

Q: What are the key differences between REG103GA-5 and TPS7A2650DRVR?

A: Both devices deliver 5V at 500mA with enable control and protection features. TPS7A2650DRVR offers lower quiescent current (4.5µA vs 0.7mA), higher maximum input voltage (18V vs 15V), extended operating temperature range (-40°C to 125°C vs -40°C to 85°C), and additional features (Power Good output, UVLO protection). The critical difference is packaging: REG103GA-5 uses SOT-223-6 while TPS7A2650DRVR uses 6-WSON (2x2), requiring PCB redesign.

Q: Does package change from SOT-223-6 to 6-WSON affect thermal performance?

A: The 6-WSON package with exposed pad provides improved thermal characteristics compared to SOT-223-6. Thermal performance depends on PCB layout, copper area, and via placement. Consult device datasheets for thermal resistance specifications (θJA and θJC values).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. REG103GA-5G4, REG103GA-5, and TPS7A2650DRVR are all ROHS3 compliant. All devices are REACH unaffected and classified under ECCN EAR99.

Q: What is the MSL rating difference and why does it matter?

A: REG103GA-5G4 and REG103GA-5 have MSL 2 (1 Year), while TPS7A2650DRVR has MSL 1 (Unlimited). MSL rating indicates moisture sensitivity level for surface mount components. Lower MSL ratings (1 vs 2) allow longer shelf life and more flexible storage conditions without baking requirements.

Q: Can TPS7A2650DRVR be used in existing REG103GA-5G4 designs without modification?

A: No. TPS7A2650DRVR requires PCB footprint redesign due to different packaging (6-WSON vs SOT-223-6). Pin configuration and layout differ significantly. Design review and PCB layout modification are necessary.

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