LD1117v33 (LD33) - 3.3v 1.3A Positive Regulator -3pin (TO-220) [Original]

LD1117v33 (LD33) - 3.3V 1.3A Positive Linear Regulator (LDO) - TO-220

The LD1117v33, also identified as LD33, functions as a 3.3V fixed output linear voltage regulator (LDO). It provides up to 1.3A of output current. The component is supplied in a 3-pin TO-220 package. A minimum 10 µF capacitor is required for stable operation. Output voltage tolerance is ±1% at 25°C, achieved through on-chip trimming. Integrated features include internal thermal overload protection and short-circuit current limiting. Its NPN pass transistor design directs quiescent current into the load. This regulator delivers a stable 3.3V power source.

Specifications:

• Output Voltage: 3.3V Fixed
• Output Current: Up to 1.3A
• Regulator Type: Positive Linear (LDO)
• Package: TO-220 (3-pin)
• Output Voltage Tolerance: ±1% (at 25°C)
• Minimum Output Capacitor: 10 µF
• Protection Features: Thermal Overload, Short-Circuit
• RoHS Compliance: Yes

Key features and benefits:

• Fixed 3.3V output voltage
• 1.3A maximum output current
• Low dropout voltage operation
• Internal thermal overload protection
• Internal short-circuit current limiting
• Output voltage tolerance: ±1% at 25°C
• Requires 10 µF minimum output capacitor for stability

Applications:

• Microcontroller power supplies (e.g., ESP32, STM32)
• Sensor power regulation
• Digital circuit power management
• Battery-powered device voltage regulation
• General purpose 3.3V power rails

Frequently Asked Questions:

Q: What is the pinout configuration for the LD1117v33 TO-220 package?
A: The standard TO-220 pinout for the LD1117 series is: Pin 1 (ADJ/GND), Pin 2 (Output), Pin 3 (Input). For the fixed 3.3V version, Pin 1 is Ground.

Q: What is the minimum input voltage required for the LD1117v33 to regulate 3.3V?
A: The minimum input voltage must be at least 3.3V plus the dropout voltage. The dropout voltage is typically 1.2V at 800mA, so an input of approximately 4.5V or higher is generally required.

Q: Can the LD1117v33 be used without the 10 µF output capacitor?
A: No, a minimum 10 µF output capacitor is required for the LD1117v33 to maintain stability and prevent oscillation.

Q: Is a heatsink necessary for the LD1117v33?
A: A heatsink may be necessary if the power dissipation (P = (Vin - Vout) * Iout) exceeds the device's thermal limits, especially at higher output currents or larger input-output voltage differentials.

Package Includes:

*Image shown is a representation only.

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