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Texas Instruments REG1117FA-2.5/500 — Power Management (PMIC / Gate Driver)

TI REG1117FA-2.5/500 LDO Regulator, 2.5V Fixed, 1A

MPNREG1117FA-2.5/500
End of Life

Texas Instruments REG1117FA-2.5/500 LDO voltage regulator, fixed 2.5V output, 1A output, DDPAK/TO-263-3 surface-mount package, -40°C to 125°C.

$4.16Ref. price · indicative, final on quote
Texas Instruments REG1117FA-2.5/500 datasheet (PDF)
PackagingTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

REG1117FA-2.5/500 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input15V
Voltage dropout1.55V @ 1A
Voltage - output (Min (Fixed))2.5V
Output current1A
Current - quiescent10 mA
Operating temperature-40°C ~ 125°C
PSRR62dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

1A fixed 2.5V LDO for industrial and automotive rails

The REG1117FA-2.5/500: Its 1.55V maximum dropout at full load means the input must stay above roughly 4.05V to maintain regulation — a 5V rail provides comfortable headroom, while a 3.3V rail would not sustain the output. The -40°C to 125°C operating range qualifies it for under-hood automotive, industrial motor drives, and outdoor telecom equipment where ambient temperatures exceed commercial limits.

PSRR and protection for noise-sensitive loads

Built-in over-current and over-temperature protection allow the part to survive a sustained short on the output or a high-temperature environment without external crowbar or thermal shutdown circuitry. The 10 mA quiescent current is typical for a 1A-class LDO; it contributes roughly 1% efficiency loss at full load, but the trade-off is faster transient response compared to micropower regulators.

Board integration: DDPAK thermal pad and footprint

ROHS3 compliant with no exemption conflicts for lead-free reflow profiles.

Frequently asked questions

What does the 62 dB PSRR at 120 Hz mean for my circuit?

The 62 dB PSRR figure means the regulator attenuates 120 Hz ripple (full-wave rectified mains) by a factor of approximately 1250. If the input has 100 mV of 120 Hz ripple, the output will see less than 80 µV of that ripple — adequate for powering 16-bit ADCs or precision analog circuits without additional post-filtering.

What input voltage does the REG1117FA-2.5/500 need to maintain a clean 2.5V output?

With a maximum dropout voltage of 1.55V at 1A, the input must stay above 4.05V (2.5V + 1.55V) across all load and temperature conditions. A 5V ±5% rail provides safe margin; a 3.3V rail cannot sustain the output. At lighter loads the dropout is lower, but the worst-case 1.55V figure governs the design.

What compliance documentation does Texas Instruments provide for this part?

Texas Instruments provides ROHS3 compliance (exemption-free lead-free status) for the REG1117FA-2.5/500. Standard TI documentation includes the datasheet, PCN notifications, and material composition declarations available through their product page.