REG104FA-AKTTTG3 Equivalent & Substitute Parts

Part Overview

The REG104FA-AKTTTG3 is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. This Surface Mount device delivers 1A output current in a TO-263 (DDPAK-5) package and supports input voltages up to 15V with adjustable output ranging from 1.295V to 5.5V. The part is classified as Obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement planning.

Substiute Parts

REG104FA-AKTTTG3

Texas InstrumentsIn Stock: 919REG104FA-AKTTTG3 Datasheet

Current PartRFQ

REG104FA-A/500

Texas InstrumentsIn Stock: 2035REG104FA-A/500 Datasheet

Parametric EquivalentRFQ

REG104FA-A/500G3

Texas InstrumentsIn Stock: 721REG104FA-A/500G3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REG104FA-AKTTTG3 are qualified based on the following critical parameters that determine functional interchangeability:

• Output Configuration: Positive
• Output Type: Adjustable
• Number of Regulators: 1
• Voltage - Input (Max): 15V
• Voltage - Output Range: 1.295V to 5.5V
• Current - Output: 1A
• Package / Case: TO-263-6, D2PAK (5 Leads + Tab)
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Control Features: Enable
• Protection Features: Over Current, Over Temperature

All identified substitute parts maintain these core electrical and mechanical specifications, ensuring direct functional replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

REG104FA-A/500G3 is the primary substitute for new designs and ongoing production. This part carries Active product status from Texas Instruments, ensuring long-term availability and continued manufacturing support. It maintains full electrical and mechanical compatibility with the obsolete REG104FA-AKTTTG3 across all critical parameters.

REG104FA-A/500 serves as a secondary option for applications where Last Time Buy inventory remains available. This part is electrically equivalent but carries Last Time Buy status, indicating limited future availability.

Both substitute parts are ROHS3 Compliant and carry identical MSL ratings, ensuring compliance with environmental and handling requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can REG104FA-A/500G3 directly replace REG104FA-AKTTTG3 in existing PCB designs?

A: Yes. Both parts share identical output configuration, adjustable output type, voltage specifications (1.295V to 5.5V), 1A output current, and TO-263 package footprint. No PCB modifications are required.

Q: What is the difference in voltage dropout between the main part and substitutes?

A: REG104FA-AKTTTG3 specifies 0.48V dropout at 1A, while REG104FA-A/500 and REG104FA-A/500G3 specify 0.58V at 1A. This 0.1V difference may impact thermal performance in low-input-voltage applications but does not affect functional compatibility.

Q: Why is REG104FA-A/500G3 recommended over REG104FA-A/500?

A: REG104FA-A/500G3 carries Active product status, ensuring ongoing manufacturing and long-term availability. REG104FA-A/500 is Last Time Buy, indicating limited future procurement options.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-263-6 (D2PAK with 5 Leads + Tab) package with identical pinout and mounting requirements for Surface Mount assembly.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. REG104FA-A/500 and REG104FA-A/500G3 are both ROHS3 Compliant with MSL 2 (1 Year) ratings, matching the original part's environmental and handling specifications.