Overview
The LD1117AS33TR is a low dropout (LDO) voltage regulator produced by STMicroelectronics. This device is part of the LD1117A series and is designed to provide a fixed output voltage of 3.3V with a maximum output current of 1A. It is available in the SOT-223 package, which optimizes thermal characteristics and offers a space-saving advantage. The LD1117AS33TR is known for its high efficiency, low quiescent current, and robust thermal and current limiting features, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 3.3 | V |
| Output Current | Up to 1 | A |
| Input Voltage | Up to 15 | V |
| Dropout Voltage | 1.15 (typ. @ IOUT = 1 A, 25 °C) | V |
| Quiescent Current | 5 mA (typ. @ 25 °C) | mA |
| Thermal Resistance Junction-Case | 15 | °C/W |
| Thermal Resistance Junction-Ambient | 110 | °C/W |
| Operating Junction Temperature Range | 0 to +125 | °C |
| Storage Temperature Range | -40 to +150 | °C |
| Package Type | SOT-223 |
Key Features
- Low dropout voltage: 1.15 V (typ. @ IOUT = 1 A, 25 °C)
- Very low quiescent current: 5 mA (typ. @ 25 °C)
- High supply voltage rejection: 80 dB (typ. @ 25 °C)
- Internal current and thermal limiting
- Stability with a minimum 10 µF capacitor
- Tight output voltage tolerance: ± 2% at 25 °C
- High efficiency due to NPN pass transistor
Applications
The LD1117AS33TR is versatile and can be used in various applications, including:
- Power supplies for electronic devices requiring a stable 3.3V output.
- Industrial control systems.
- Automotive systems.
- Consumer electronics.
- Telecommunication equipment.
Q & A
- What is the output voltage of the LD1117AS33TR?
The output voltage of the LD1117AS33TR is 3.3V. - What is the maximum output current of the LD1117AS33TR?
The maximum output current is up to 1A. - What is the typical dropout voltage of the LD1117AS33TR at 1A output current?
The typical dropout voltage is 1.15V at 1A output current and 25°C. - What is the quiescent current of the LD1117AS33TR?
The quiescent current is typically 5 mA at 25°C. - What is the operating junction temperature range of the LD1117AS33TR?
The operating junction temperature range is from 0 to +125°C. - What package type is the LD1117AS33TR available in?
The LD1117AS33TR is available in the SOT-223 package. - What is the minimum capacitor required for stability?
A minimum of 10 µF capacitor is required for stability. - Does the LD1117AS33TR have internal current and thermal limiting?
Yes, it has internal current and thermal limiting features. - What is the supply voltage rejection of the LD1117AS33TR?
The supply voltage rejection is typically 80 dB at 25°C. - What are some common applications of the LD1117AS33TR?
Common applications include power supplies, industrial control systems, automotive systems, consumer electronics, and telecommunication equipment.
