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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)：6.5V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.55V @ 300mA
- Current - Output：300mA
- Current - Quiescent (Iq)：30 µA
- Current - Supply (Max)：30 µA
- PSRR：-
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 85°C (TA)
- 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 LM1108SF-3.3 is a fixed-output, high-accuracy CMOS low-dropout regulator manufactured by TAEJIN Technology (HTC Korea). It provides a nominal 3.3V output with a maximum load current of 300mA and an extremely low supply current of typically 50µA at full load. The device features a very low dropout voltage, typically 240mV at full load, and maintains stability with an output capacitor as small as 1µF. It incorporates integrated over-current and over-temperature protection mechanisms.
Feature Summary
- Ultra-low noise operation with fast response to step changes in load
- Integrated thermal shutdown circuitry that activates above 150°C
- Compatible with MLCC capacitors for stable operation
- High output voltage accuracy within +/- 1.4%
Applications
- Battery-operated systems
- Portable computers
- Medical instruments
- Cellular/GSM/PHS phones
Procurement Notes
Verify the specific suffix 'SF' corresponds to the SOT-23 3L package configuration when sourcing. Confirm the '3.3' designation matches the required 3.3V fixed output voltage. Ensure the component meets Moisture Sensitivity Level 3 requirements for your assembly process. Cross-reference the manufacturer's ordering information to validate the exact marking code H33 for this variant.
Selection Notes
Select this regulator for applications requiring minimal quiescent current and high accuracy. It is suitable for designs needing a low input-to-output differential of 0.3V at full load. Consider its compatibility with MLCCs if space constraints limit capacitor selection. Evaluate thermal dissipation capabilities based on the SOT-23 package power rating of 230mW.
Part Context
This component belongs to the LM1108 series of 300mA CMOS LDO regulators from HTC Korea. The series includes variants with different packages such as SOT-23, SOT-23-5L, and SOT-89. The LM1108 family is designed to replace bipolar regulators by offering significantly lower supply currents while maintaining high precision and robust protection features.
Replacement Considerations
LM1108SF5-3.3
FAQ
What is the minimum required output capacitance for stability?
A minimum of 1µF capacitor from VOUT to ground is required. The effective series resistance should be greater than 0Ω and less than 0.1Ω.
How does the supply current behave under varying loads?
Unlike bipolar regulators, the LM1108’s supply current does not increase with load current, remaining typically at 50µA even at full load.
