LD1117 in LM1117 / LD1117 LDO Family
The LD1117 is a low-dropout linear regulator family manufactured primarily by STMicroelectronics, serving as a popular alternative to the industry-standard LM1117. It is designed to provide up to 800mA or 1.2A of output current with a typical dropout voltage of 1.1V at full load. These regulators are fundamental in modern electronics for converting higher DC voltages to lower, stable rails required by microcontrollers, sensors, and communication modules in various industrial and consumer designs.
Variants in This Sub-Family
Comparing specs that differ across variants.
| Part Number | Package | Output V | Output I | PSRR | Output Type | Temp Range | Stock |
|---|---|---|---|---|---|---|---|
| LD1117-ADJ (STMicroelectronics) | 4-261 | 1.25V | — | 120Hz | Adjustable | -40degC ~ 125degC .. | 1,570 |
| LD1117AS12TR (STMicroelectronics) Tape & Reel | 4-261 | 1.2V | 1A | 120Hz | Fixed | 0degC ~ 125degC | 57,161 |
| LD1117DT18TR (STMicroelectronics) Tape & Reel | 3-252 | 1.8V | 800mA | 120Hz | Fixed | 0degC ~ 125degC | 6,765 |
The LD1117 family is categorized by output voltage and package type. Variants include fixed-voltage models (e.g., LD1117V33 for 3.3V) and the adjustable LD1117-ADJ, which uses an external resistor divider to set the output. Package options range from through-hole TO-220 for heat dissipation to surface-mount SOT-223 and DPAK for space-constrained layouts. Accuracy variants also exist, with standard versions offering 2% tolerance and 'S' versions providing tighter 1% regulation.
