REG104GA-3.3 Equivalent & Substitute Parts

Part Overview

The REG104GA-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 1A current capacity in a SOT-223-6 surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications utilizing this regulator.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	REG104GA-3.3
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	1A
Input Voltage (Max)	15V
Dropout Voltage (Max)	0.48V @ 1A
Package / Case	SOT-223-6
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Product Status	Last Time Buy
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the REG104GA-3.3 are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output voltage: 3.3V fixed
Package type: SOT-223-6 surface mount
Output configuration: Positive fixed regulator
Control features: Enable function
Protection features: Over temperature protection (minimum requirement)
Compliance: ROHS3 and REACH standards

Substitution Categories:

Manufacturer Recommended Substitute (MFR): TL1963A-33DCQR — Higher current capacity (1.5A) with extended input voltage range and improved temperature operating range. Maintains identical package and output voltage specification.
Parametric Equivalent: REG104GA-3.3G4 — Identical electrical specifications and package as the main part. Classified as Obsolete, suitable only when new stock of REG104GA-3.3 is unavailable and design flexibility permits component revision.

Parameter Comparison

Parameter	REG104GA-3.3 (Main)	TL1963A-33DCQR (MFR Substitute)	REG104GA-3.3G4 (Parametric Equivalent)
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	3.3V	3.3V	3.3V
Output Current	1A	1.5A	1A
Input Voltage (Max)	15V	20V	15V
Dropout Voltage (Max)	0.48V @ 1A	0.55V @ 1.5A	0.48V @ 1A
Quiescent Current (Iq)	0.7 mA	1 mA	0.7 mA
PSRR (120Hz)	65dB	63dB	65dB
Package / Case	SOT-223-6	SOT-223-6	SOT-223-6
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Product Status	Last Time Buy	Active	Obsolete
Protection Features	Over Current, Over Temperature	Over Temperature, Reverse Polarity	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production and New Designs: Select TL1963A-33DCQR as the primary substitute. This part is in Active product status, ensuring long-term availability and supply chain stability. The increased output current capacity (1.5A vs. 1A) and extended input voltage range (20V vs. 15V) provide design margin without requiring circuit modifications. The extended operating temperature range (-40°C ~ 125°C) supports broader application environments. All compliance certifications (ROHS3, REACH) are maintained.

For End-of-Life Replacement Only: REG104GA-3.3G4 is a parametric equivalent with identical electrical specifications and package. However, its Obsolete product status limits its viability for sustained production. This option is acceptable only when immediate design revision is not feasible and limited quantities are required.

Design Considerations: Both substitute options maintain the SOT-223-6 package footprint, enabling direct PCB layout compatibility. Schematic modifications are not required for either substitute. Verify that the application's input voltage does not exceed 15V if using REG104GA-3.3G4; applications with input voltages between 15V and 20V require TL1963A-33DCQR.

Frequently Asked Questions (FAQ)

Q: Can TL1963A-33DCQR be used as a direct replacement for REG104GA-3.3? A: Yes. Both parts share identical output voltage (3.3V), package type (SOT-223-6), and control features (Enable). The TL1963A-33DCQR provides higher current capacity (1.5A vs. 1A) and extended input voltage range (20V vs. 15V), making it a compatible upgrade with no circuit modifications required.

Q: What is the difference between the MFR substitute and the parametric equivalent? A: TL1963A-33DCQR (MFR substitute) is in Active product status with enhanced specifications. REG104GA-3.3G4 (parametric equivalent) is Obsolete and provides identical electrical performance to the original part. Choose TL1963A-33DCQR for new production; REG104GA-3.3G4 is suitable only for limited end-of-life support.

Q: Are there any protection feature differences between these parts? A: REG104GA-3.3 and REG104GA-3.3G4 include Over Current and Over Temperature protection. TL1963A-33DCQR includes Over Temperature and Reverse Polarity protection. Both provide adequate protection for standard linear regulator applications; Reverse Polarity protection in the TL1963A-33DCQR offers additional circuit safeguarding.

Q: Will the PCB layout require modification if I switch to a substitute? A: No. All three parts use the SOT-223-6 package with identical pinout and footprint. PCB layout remains unchanged; component substitution is a direct swap.

Q: What is the maximum input voltage for each part? A: REG104GA-3.3 and REG104GA-3.3G4 support maximum input voltage of 15V. TL1963A-33DCQR supports maximum input voltage of 20V. Verify your application's input voltage specification before selecting a substitute.

Q: Are all parts RoHS and REACH compliant? A: Yes. REG104GA-3.3, TL1963A-33DCQR, and REG104GA-3.3G4 are all ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

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