REG104GA-3.3G4 Equivalent & Substitute Parts

Part Overview

The REG104GA-3.3G4 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications. This Surface Mount device in SOT-223-6 package delivers 1A output current with integrated over-current and over-temperature protection. The part is classified as Obsolete, necessitating identification of equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

REG104GA-3.3G4

Texas InstrumentsIn Stock: 890REG104GA-3.3G4 Datasheet

Current PartRFQ

TL1963A-33DCQR

Texas InstrumentsIn Stock: 1258TL1963A-33DCQR Datasheet

MFR RecommendedRFQ

REG104GA-3.3

Texas InstrumentsIn Stock: 1900REG104GA-3.3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REG104GA-3.3G4 are qualified based on the following electrical and mechanical parameters:

Critical Compatibility Parameters:

• Output voltage: 3.3V fixed
• Package type: SOT-223-6 (identical pinout and form factor)
• Output configuration: Positive
• Control features: Enable function
• RoHS compliance: ROHS3 Compliant
• Mounting type: Surface Mount

Allowable Variation Parameters:

• Output current: Equal to or greater than 1A
• Input voltage maximum: Equal to or greater than 15V
• Voltage dropout: Equal to or less than 0.48V @ rated current
• Operating temperature range: Equal to or greater than -40°C ~ 85°C
• Protection features: Over-temperature protection (minimum requirement)

Parameter Comparison

Engineering Selection Recommendations

REG104GA-3.3 (Last Time Buy Status): This part maintains identical electrical specifications to the REG104GA-3.3G4, including output current, voltage dropout, and quiescent current characteristics. The only difference is packaging format (Tube vs. -). This substitute is suitable for applications requiring exact parameter matching. However, Last Time Buy status indicates limited future availability.

TL1963A-33DCQR (Active Status): This part exceeds the minimum electrical requirements of the REG104GA-3.3G4 with higher output current (1.5A vs. 1A), higher maximum input voltage (20V vs. 15V), and extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). The TL1963A-33DCQR maintains SOT-223-6 package compatibility and ROHS3 compliance. Active product status ensures long-term availability. Voltage dropout at rated current (0.55V @ 1.5A) remains within acceptable margins for 3.3V regulation applications.

Frequently Asked Questions (FAQ)

Q: Can REG104GA-3.3 be used as a direct replacement for REG104GA-3.3G4?

A: Yes. Both parts share identical electrical specifications: 3.3V fixed output, 1A output current, 0.48V dropout, and -40°C ~ 85°C operating range. The difference is packaging format only. Verify packaging requirements for your assembly process.

Q: Is TL1963A-33DCQR compatible with REG104GA-3.3G4 applications?

A: Yes, with design margin considerations. The TL1963A-33DCQR operates within the same SOT-223-6 package and maintains 3.3V output voltage. Higher output current (1.5A) and input voltage rating (20V) provide design headroom. Voltage dropout increases slightly (0.55V @ 1.5A), which remains acceptable for most 3.3V regulation circuits. Extended temperature range (-40°C ~ 125°C) offers additional operational margin.

Q: What are the key differences between the two substitute parts?

A: REG104GA-3.3 provides exact parameter matching with Last Time Buy status. TL1963A-33DCQR offers enhanced specifications (higher current and voltage ratings) with Active product status, ensuring continued availability.

Q: Are all three parts ROHS3 compliant?

A: Yes. REG104GA-3.3G4, REG104GA-3.3, and TL1963A-33DCQR are all ROHS3 compliant with MSL 2 (1 Year) moisture sensitivity rating.

Q: Does package compatibility affect PCB layout?

A: No. All three parts use SOT-223-6 package with identical pinout and form factor, requiring no PCB layout modifications.