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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 800MA TO252-3
- 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-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：TO-252-3
- Grade：-
- Qualification：-
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Overview
The LM1117DTX-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 an input voltage range up to 15 V and features a typical dropout voltage of 1.2 V at full load. The device utilizes a SOT-223 package (DCY) for surface-mount installation. Electrical characteristics include a line regulation of 1 mV and a ripple rejection ratio of 75 dB at 120 Hz. The component supports a junction temperature range from 0°C to +125°C.
Feature Summary
- Integrated Zener-trimmed bandgap reference ensures high output voltage accuracy.
- Includes internal current limiting and thermal shutdown protection mechanisms.
- Designed for improved transient response and stability with external capacitors.
Applications
- AC drive power stage modules
- Merchant network and server PSU
- Industrial AC/DC power supplies
Procurement Notes
Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as defined by Texas Instruments. Confirm the 'DTX' designation corresponds to the tape-and-reel packaging format rather than tube packaging. Ensure the DCY SOT-223 package variant matches the required footprint for the target PCB layout.
Selection Notes
Select this component when a fixed 3.3 V rail is required with up to 800 mA capacity. Verify that the application environment remains within the 0°C to +125°C operating range. Consider the 1.2 V dropout requirement to ensure sufficient input-to-output voltage differential under all load conditions.
Part Context
This part belongs to the LM1117 family of low-dropout regulators. It serves as a direct replacement for older National Semiconductor versions while offering modern manufacturing standards. The device is positioned as a cost-effective solution for general-purpose linear regulation tasks in industrial and commercial electronics.
Replacement Considerations
The TLV1117 is documented as a newer drop-in alternative. For applications requiring improved functionality in the same SOT-223 package, the TLV761 is specified as a compatible replacement option.
FAQ
What type of output capacitor is recommended for stability?
A minimum of 10 µF tantalum capacitor is required at the output to improve transient response and ensure regulator stability.
How does the adjust pin function in this fixed version?
In the fixed 3.3 V version, the adjust pin functions as the ground connection internally, unlike the adjustable variant which uses it for external resistor setting.
