STMicroelectronics LD1117DT12TR, fixed 1.2V output, 800mA low-dropout linear regulator in DPAK (TO-252-3) package, PSRR 75 dB at 120 Hz, active production.
| Parameter | Value |
|---|---|
| Output type | Fixed |
| Mounting | Surface Mount |
| Voltage - input | 15V |
| Voltage dropout | 1.2V @ 800mA |
| Voltage - output (Min (Fixed)) | 1.2V |
| Output current | 800mA |
| Current - quiescent | 5 mA |
| Operating temperature | 0°C~125°C |
| PSRR | 75dB (120Hz) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | TO-252-3, DPak (2 Leads + Tab), SC-63 |
| Protection features | Over Current, Over Temperature |
| Number of regulators | 1 |
| Output configuration | Positive |
The LD1117DT12TR is a fixed-output LDO from STMicroelectronics' LD1117 series, delivering a regulated 1.2V at up to 800 mA continuous. The maximum dropout voltage is 1.2V at the full 800 mA load. PSRR is 75 dB at 120 Hz.
The 1.2V max dropout at 800 mA is the key headroom number. Quiescent current is 5 mA.
PSRR is 75 dB at 120 Hz. This is the ripple rejection at the fundamental of a full-wave rectified mains supply. For higher-frequency ripple from a switching regulator, PSRR rolls off — the datasheet plot shows the curve, but the 120 Hz number is the headline for line-frequency filtering.