REG103GA-3.3G4 Equivalent & Substitute Parts

Part Overview

The REG103GA-3.3G4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 500mA current capacity in a SOT-223-6 surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. The regulator provides integrated over-current and over-temperature protection with an enable control feature, making it suitable for general-purpose power management applications requiring stable 3.3V regulation.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	3.3V
Voltage - Input (Max)	15V
Current - Output	500mA
Voltage Dropout (Max)	0.28V @ 500mA
Package / Case	SOT-223-6
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the REG103GA-3.3G4 is determined by strict equivalence across the following critical parameters:

Output voltage: 3.3V fixed
Output current capacity: 500mA minimum
Input voltage rating: 15V maximum
Package type: SOT-223-6 surface mount
Voltage dropout: 0.28V @ 500mA maximum
Protection features: Over-current and over-temperature protection
Control features: Enable function
Operating temperature range: -40°C to 85°C

The REG103GA-3.3 qualifies as a direct substitute based on identical electrical specifications and package configuration. Both parts share the same base product number (REG103) and maintain equivalent performance characteristics across all critical parameters.

Parameter Comparison

Parameter	REG103GA-3.3G4 (Main)	REG103GA-3.3 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V
Output Current	500mA	500mA
Input Voltage (Max)	15V	15V
Voltage Dropout (Max)	0.28V @ 500mA	0.28V @ 500mA
Quiescent Current	0.7 mA	0.7 mA
PSRR	65dB (120Hz)	65dB (120Hz)
Package	SOT-223-6	SOT-223-6
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature
Control Features	Enable	Enable
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Last Time Buy

Engineering Selection Recommendations

The REG103GA-3.3 is the direct equivalent substitute for the REG103GA-3.3G4. Both parts maintain identical electrical performance specifications and physical package configuration. The primary distinction is product status: the original part is discontinued at DiGi Electronics, while the substitute is designated as Last Time Buy, indicating limited availability. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Selection of the REG103GA-3.3 substitute ensures functional equivalence with no circuit redesign required. The packaging difference (tube versus unspecified for the original) does not affect electrical performance or PCB assembly compatibility.

Frequently Asked Questions (FAQ)

Q: Can REG103GA-3.3 be used as a direct replacement for REG103GA-3.3G4?

A: Yes. Both parts are electrically identical with matching output voltage (3.3V), output current (500mA), input voltage rating (15V), voltage dropout (0.28V @ 500mA), and package type (SOT-223-6). No circuit modifications are required.

Q: What is the difference between REG103GA-3.3G4 and REG103GA-3.3?

A: The parts are functionally equivalent. The primary difference is product status: REG103GA-3.3G4 is discontinued at DiGi Electronics, while REG103GA-3.3 is Last Time Buy. Packaging is specified as tube for the substitute.

Q: Are there any compatibility concerns with the SOT-223-6 package?

A: No. Both parts use the identical SOT-223-6 surface mount package, ensuring direct PCB footprint compatibility without layout modifications.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both REG103GA-3.3G4 and REG103GA-3.3 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the operating temperature range for these regulators?

A: Both parts operate across -40°C to 85°C, suitable for industrial and commercial temperature environments.

Q: Are the protection features identical?

A: Yes. Both parts include over-current and over-temperature protection with enable control functionality.

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