Texas Instruments REG103FA
REG103FA variants from Texas Instruments
REG103FA Overview
What changes between part numbers, and what to check before you lock the BOM — Microcontrollers.
Key Features
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 7 distinct suffix patternsExamples: 2.5KTTT, 2.5KTTTG3, 3.3KTTT, 5KTTT, 5KTTTG3 (+2 more). Decode suffix meaning in the ordering notes under the variant table.
Target Applications
- Microcontrollers — design-in and field replacement
- BOM scrub where only the base prefix is known but suffix is TBD
- Second-source checks when the original MPN is constrained
Ordering Variants
Compare 7 REG103FA part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|
| REG103FA-2.5KTTT | 2.5V LDO 500mA, 15V In, TO-263, Power Good | Texas Instruments | Active | Compliant | In Stock | |
| REG103FA-2.5KTTTG3 | 2.5V LDO 500mA 15V In, TO-263, Power Good, Enable | Texas Instruments | Active | Compliant | In Stock | |
| REG103FA-3.3KTTT | 3.3V LDO 500mA 15V In, TO-263, Power Good, Enable | Texas Instruments | Active | Compliant | In Stock | |
| REG103FA-5KTTT | 5V LDO 500mA, 15V In, TO-263, Power Good, Enable | Texas Instruments | Active | Compliant | In Stock | |
| REG103FA-5KTTTG3 | 5V LDO Regulator, 500mA, 15V In, TO-263 | Texas Instruments | Active | Compliant | In Stock | |
| REG103FA-A/500 | 500-mA, 15-V, low-dropout voltage regulator with power good & enable 5-DDPAK/TO-263 -40 to 85 | Texas Instruments | Active | Compliant | In Stock | |
| REG103FA-AKTTT | 500mA 15V Adj LDO, 1.295V Ref, TO-263 | Texas Instruments | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on REG103FA map to package, grade, and reel options.
How to Choose the Right REG103FA Microcontrollers
Match the footprint first
Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.
Electrical headroom
Compare voltage and current columns in the variant table. For REG103FA, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.
Temp grade letter matters
Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.
Copy the full MPN
Do not BOM only "REG103FA" — include the full suffix (e.g. 2.5KTTT, 2.5KTTTG3, 3.3KTTT). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for REG103FA product family
Identity
Variant Parameters
Source REG103FA with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 7 ordering variants from Texas Instruments. Our team supports active, EOL, and hard-to-find component sourcing.
- Original manufacturer parts with traceability options
- BOM upload and multi-line RFQ support
- Package, grade, and compliance verification
Frequently Asked Questions
Common technical questions about the REG103FA product family.