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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 800MA TO252-3
- Series：-
- Mfr：National Semiconductor
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：1.8V
- 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-1.8/NOPB is a fixed-output low dropout linear regulator from the LM1117 series, manufactured by Texas Instruments (originating from National Semiconductor). It provides a fixed 1.8 V output with a maximum load current of 800 mA. The device features a typical dropout voltage of 1.2 V at full load and includes internal current limiting and thermal shutdown protection. It operates within an ambient temperature range of -40°C to +125°C and utilizes a TO-252-3 surface-mount package.
Feature Summary
- Fixed 1.8 V output voltage
- 800 mA continuous output current capability
- Internal current limit and thermal overload protection
- Low dropout voltage characteristic
Applications
- Battery-powered systems requiring efficient voltage regulation
- Post-regulation for switching power supplies
- On-card regulation for distributed power architectures
Procurement Notes
Verify that the component is sourced as a Texas Instruments product, as National Semiconductor was acquired by TI. Confirm the 'NOPB' suffix indicates lead-free and halogen-free compliance. Ensure the package matches the specified TO-252-3 form factor and that the output voltage is strictly fixed at 1.8 V, not adjustable.
Selection Notes
Select this part when a stable 1.8 V rail is required with up to 800 mA load capacity in a compact surface-mount footprint. Consider the 1.2 V dropout voltage when determining the minimum input voltage headroom. Verify that the application does not exceed the thermal limits defined for the TO-252-3 package under expected operating conditions.
Part Context
This component belongs to the LM1117 family of positive low dropout regulators. While originally developed by National Semiconductor, current production and datasheets are managed by Texas Instruments following their acquisition. The device shares pinouts and functional characteristics with other variants in the series, such as adjustable versions or those with different fixed output voltages.
Replacement Considerations
Compatible substitutes include LM1117DT-1.8/NOPB (tube packaging) and LM1117IDTX-1.8/NOPB (industrial grade). Ensure the replacement maintains the same fixed 1.8 V output and TO-252-3 package compatibility.
