REG104FA-A/500 Equivalent & Substitute Parts

Part Overview

The REG104FA-A/500 is a linear voltage regulator IC from Texas Instruments, classified as a positive adjustable output regulator with 1A output capacity in a TO-263 (DDPAK-5) surface mount package. This component is designated as Last Time Buy, indicating discontinued production status. Finding equivalent or substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring positive adjustable voltage regulation.

Substiute Parts

REG104FA-A/500

Texas InstrumentsIn Stock: 2035REG104FA-A/500 Datasheet

Current PartRFQ

TL1963AKTTR

Texas InstrumentsIn Stock: 16722TL1963AKTTR Datasheet

MFR RecommendedRFQ

REG104FA-A/500G3

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REG104FA-A/500 are classified into two categories based on parametric alignment:

Parametric Equivalent: REG104FA-A/500G3 maintains identical electrical specifications including output current (1A), input voltage maximum (15V), output voltage range (1.295V to 5.5V), and dropout voltage (0.58V @ 1A). This part shares the same base product number (REG104) and package configuration, differing only in product status (Active vs. Last Time Buy) and packaging format.

Manufacturer Recommended Substitute: TL1963AKTTR is a higher-capacity alternative with enhanced specifications. While maintaining the same package type (TO-263 DDPAK-5) and positive adjustable output configuration, it provides increased output current (1.5A vs. 1A), higher maximum input voltage (20V vs. 15V), extended output voltage range (1.21V to 20V), and improved operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). This part is currently in Active product status.

Substitution eligibility is determined by matching output configuration (Positive), output type (Adjustable), package type (TO-263 DDPAK-5), and compliance certifications (ROHS3, REACH Unaffected).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: REG104FA-A/500G3 is the appropriate selection when maintaining identical electrical performance is required. This part provides parametric equivalence with identical output current, voltage specifications, and thermal characteristics. Active product status ensures ongoing availability and supply chain stability compared to the Last Time Buy status of the original part.

For Enhanced Performance Applications: TL1963AKTTR is suitable when design specifications permit higher output current capacity (1.5A), extended input voltage tolerance (20V maximum), or wider operating temperature range (-40°C ~ 125°C). This part maintains package compatibility and regulatory compliance while providing additional design margin. Selection of this substitute requires confirmation that the application can accommodate the increased quiescent current (1 mA vs. 0.7 mA) and slightly lower PSRR (63dB vs. 65dB).

Both substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can REG104FA-A/500G3 be used as a direct drop-in replacement for REG104FA-A/500?

A: Yes. REG104FA-A/500G3 is a parametric equivalent with identical electrical specifications, output current rating, voltage ranges, and package configuration. No circuit modifications are required.

Q: What are the key differences between REG104FA-A/500 and TL1963AKTTR?

A: TL1963AKTTR provides higher output current (1.5A vs. 1A), extended maximum input voltage (20V vs. 15V), wider output voltage range (1.21V to 20V vs. 1.295V to 5.5V), and broader operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). Quiescent current is slightly higher (1 mA vs. 0.7 mA), and PSRR is marginally lower (63dB vs. 65dB).

Q: Are all substitute parts in the same package?

A: Yes. REG104FA-A/500, REG104FA-A/500G3, and TL1963AKTTR all use the TO-263-6 D2PAK (5 Leads + Tab) package, ensuring identical PCB footprint and mounting compatibility.

Q: What is the significance of the Last Time Buy status for REG104FA-A/500?

A: Last Time Buy indicates the original part is discontinued and no longer in production. REG104FA-A/500G3 and TL1963AKTTR, both with Active status, provide long-term supply chain alternatives.

Q: Can TL1963AKTTR be used in applications designed for REG104FA-A/500?

A: TL1963AKTTR is compatible with applications designed for REG104FA-A/500 when the circuit design accommodates the higher output current capability and extended voltage specifications. Applications limited to 1A output current and 15V maximum input voltage will operate within the TL1963AKTTR's specifications without modification.

Q: Are there any compliance or certification differences between these parts?

A: All three parts maintain ROHS3 compliance and REACH Unaffected status. No compliance differences exist that would affect regulatory or environmental requirements.