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Product Detailed Parameters
- Description：IC REG LIN 3.3V 300MA SOT23-3L
- Series：-
- Mfr：TAEJIN
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：12V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.2V @ 300mA
- Current - Output：300mA
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：75dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：SOT-23-3L
- Grade：-
- Qualification：-
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Overview
The LM1117GSF-3.3 is a low dropout linear regulator manufactured by TAEJIN (HTC Korea). It provides a fixed 3.3V output with a maximum continuous current of 300mA in an SOT-23 package. The device features a typical dropout voltage of 1.2V at full load and supports a maximum input voltage of 20V. Line regulation is typically 0.1%, and load regulation is typically 0.2%. It includes internal current limiting and thermal shutdown protection, operating within a junction temperature range of -40°C to 125°C.
Feature Summary
- Low dropout performance with 1.2V drop at 300mA load
- Integrated current limit and thermal overload protection
- High line and load regulation accuracy
- Available in compact surface-mount SOT-23 package
Applications
- Active SCSI terminators
- Portable and notebook computers
- SMPS post regulators
- Motherboard clock supplies
- Battery chargers
Procurement Notes
Verify the manufacturer designation as HTC Korea/TAEJIN rather than Texas Instruments when sourcing this specific part number. Confirm the package type is SOT-23-3L and check for Moisture Sensitivity Level 3 compliance during storage handling. Ensure the ordering suffix matches the required fixed voltage version.
Selection Notes
Select this component for applications requiring a compact footprint and moderate current capability up to 300mA. Consider the thermal resistance limits of the SOT-23 package; adequate copper plane area or heat sinking may be necessary if power dissipation exceeds 0.333W at 25°C ambient. Verify that the input voltage does not exceed the 20V absolute maximum rating.
Part Context
This device belongs to the LM1117 series of positive-voltage regulators. While similar to higher-current variants like the LM1117SX, the LM1117GSF is specifically rated for 300mA output. It shares architectural similarities with the LM317 but offers lower dropout voltage and fixed voltage options without external resistors for standard outputs.
Replacement Considerations
Cross-reference models include AMS1117-3.3 and ME6211C33M5G. Verify pinout compatibility and thermal characteristics before substitution, as package variations may affect heat dissipation capabilities.
FAQ
What is the minimum output capacitance required for stability?
A capacitor of 10µF or larger is required on the output for stability.
Can the LM1117GSF-3.3 be used as an adjustable regulator?
No, the LM1117GSF-3.3 is a fixed-output version. An adjustable variant, LM1117GSF-ADJ, is available separately.
