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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 800MA TO263
- Series：LM1117-3.3
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.2V @ 800mA
- Current - Output：800mA
- Current - Quiescent (Iq)：5 mA
- Current - Supply (Max)：10 mA
- PSRR：75dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Supplier Device Package：TO-263 (DDPAK-3)
- Grade：-
- Qualification：-
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Overview
The LM1117SX-3.3/NOPB is a fixed-output low-dropout linear regulator manufactured by Texas Instruments, providing a stable 3.3 V output with a maximum load current of 800 mA. It operates within a junction temperature range of 0°C to +125°C and features a typical dropout voltage of 1.2 V at full load. The device incorporates internal current limiting and thermal shutdown protection mechanisms. It utilizes a Zener-trimmed bandgap reference to ensure an output voltage accuracy of ±1%. The component is housed in a space-saving SOT-223 package.
Feature Summary
- Provides a fixed 3.3 V output regulated by a Zener-trimmed bandgap reference for high precision.
- Includes integrated current limiting and thermal shutdown circuitry to protect against overload conditions.
- Delivers 800 mA output current capability with a low dropout voltage characteristic.
Applications
- AC drive power stage modules
- Merchant network and server PSU
- Industrial AC/DC power supplies
- Ultrasound scanners
- Servo drive control modules
Procurement Notes
Verify the specific suffix 'SX' against the manufacturer's official orderable addendum to confirm the exact tape-and-reel packaging configuration and lot traceability requirements. Ensure that the selected variant matches the required operating temperature range and package body dimensions specified in the latest datasheet revision Q documentation.
Selection Notes
Select this component when a fixed 3.3 V rail is required with up to 800 mA capacity. Ensure the input voltage provides sufficient headroom above the 1.2 V dropout threshold under maximum load conditions. Verify that the application environment remains within the 0°C to +125°C junction temperature limits defined for the standard LM1117 series.
Part Context
This part belongs to the LM1117 family of low-dropout linear regulators from Texas Instruments. The family includes adjustable versions and other fixed voltages such as 1.8 V, 2.5 V, and 5.0 V. The LM1117SX-3.3/NOPB specifically denotes the 3.3 V fixed output variant packaged in the SOT-223 form factor, designed for surface-mount assembly.
Replacement Considerations
For drop-in replacements in fixed output SOT-223 package configurations with improved functionality, see the TLV761. For newer general alternatives, see the TLV1117.
FAQ
What type of output capacitor is required for stability?
A minimum of 10-µF tantalum capacitor is required at the output to improve transient response and stability.
How is the output voltage accuracy determined?
The circuit includes a Zener trimmed bandgap reference to assure output voltage accuracy to within ±1%.
