LD1117S33TR
Brand: ST
LD1117S33TR is a linear voltage regulator from STMicroelectronics, designed for drone power distribution boards, BEC circuits, and battery voltage regulation. Superb Automation supplies genuine LD1117S33TR with full traceability, competitive pricing, and fast global delivery — supporting prototype to production volumes for drone, robotics, and industrial customers worldwide.
Product Specifications
LD1117S33TR — 3.3V, 800mA Low Dropout Voltage Regulator by STMicroelectronics
The LD1117S33TR is STMicroelectronics' 3.3v, 800ma low dropout voltage regulator. Supplied by SUPERB Automation.
Part Number Decoded — Field by Field
| Field | Value | Meaning |
|---|---|---|
| LD1117S33TR | Full Part Number | 3.3V, 800mA Low Dropout Voltage Regulator |
Quick Specifications
| Parameter | Value |
|---|---|
| Output Voltage | 3.3V Fixed |
| Output Current | 800mA |
| Dropout Voltage | 1.1V @800mA |
| Input Voltage Range | Up to 15V |
| Line Regulation | 0.2% |
| Load Regulation | 0.4% |
| Package | SOT-223 |
| Protection | Thermal shutdown, current limit |
Product Overview
3.3V, 800mA Low Dropout Voltage Regulator from STMicroelectronics. Supplied by SUPERB Automation with full traceability and batch-level QA documentation.
Key Features & Benefits
Fixed 3.3V Output — No External Resistors Needed
The LD1117S33TR provides a fixed 3.3V output with ±1% accuracy, eliminating the need for external feedback resistors. Simply add input and output capacitors for a complete power supply — ideal for powering 3.3V MCUs, sensors, and RF modules in drone systems.
800mA Output — Powers Complex Sensor Suites
With 800mA continuous output current, the LD1117S33TR can power a full drone sensor suite including IMU, barometer, magnetometer, GPS receiver, and radio receiver — all from a single LDO, reducing BOM count compared to multiple smaller regulators.
Thermal & Current Protection — Drone-Ready Reliability
Built-in thermal shutdown and current limiting protect both the regulator and downstream electronics from fault conditions. In drone applications where confined spaces challenge thermal management, these protections prevent cascade failures.
Target Applications
Drone Flight Controller Power Supply
Provides the 3.3V main rail for STM32-based flight controllers (F1, F3, F4, F7, H7 families), powering the MCU, all SPI/I²C sensors, and UART peripherals from a 5V bus or direct LiPo input (up to 4S).
Sensor & Communication Module Power
Powers GPS/GLONASS modules (u-blox NEO-M8/M9), ExpressLRS/Crossfire receivers, analog and digital VTX units, and companion communication modules with clean, regulated 3.3V.
General Embedded & IoT Power Regulation
Ubiquitous in embedded systems, Arduino shields, Raspberry Pi HATs, and IoT devices as the go-to 3.3V regulator — backed by decades of proven reliability.
Frequently Asked Questions
What capacitors are required for the LD1117S33TR?
A 10µF tantalum or ceramic capacitor on the output is recommended for stability. The LD1117 is stable with ESR from 0.3Ω to 22Ω. For ceramic output capacitors, ensure the ESR is within this range or add a small series resistor.
Can the LD1117S33TR be powered directly from a LiPo battery?
Yes, for up to 4S LiPo (16.8V max). The input voltage rating is 15V absolute maximum, so for 4S operation use a pre-regulator or ensure your fully-charged 4S pack is within tolerance. For 6S, use a buck converter before the LDO.
Request a Quote
SUPERB Automation supplies genuine STMicroelectronics LD1117S33TR with full traceability and competitive lead times. Contact us with your target quantity — we'll respond with a quotation within 24 hours.