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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 1A SOT89
- Series：-
- Mfr：TAEJIN
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：20V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：1A
- 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-243AA
- Supplier Device Package：SOT-89
- Grade：-
- Qualification：-
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Overview
The LM1117F-3.3 is a fixed-output low dropout voltage regulator manufactured by TAEJIN, providing a stable 3.3V output with a maximum continuous current of 1.0A. It operates within an input voltage range up to 20V and maintains performance across a junction temperature range of -40°C to +125°C. The device features a typical dropout voltage of 1.2V at full load and includes internal current and thermal protection mechanisms.
Feature Summary
- Provides a fixed 3.3V output with high line and load regulation accuracy
- Delivers up to 1.0A output current with low dropout characteristics
- Incorporates built-in overcurrent and thermal shutdown protection
- Available in the SOT-89 surface-mount package for compact designs
Applications
- Active SCSI terminators
- Portable and notebook computer power supplies
- Motherboard clock supply circuits
- Disk drive power regulation
- Battery charger systems
Procurement Notes
Verify that the component matches the specific SOT-89 package configuration and the 3.3V fixed output variant. Confirm the manufacturer designation aligns with TAEJIN specifications rather than generic equivalents. Ensure the part number suffix corresponds to the correct tape and reel packaging status if required for automated assembly processes.
Selection Notes
Select this regulator when a stable 3.3V rail is required for digital logic or peripheral interfaces drawing up to 1A. It is suitable for applications where low noise and simple implementation are prioritized over switching converter efficiency. Ensure adequate copper area on the PCB to manage thermal dissipation given the SOT-89 package constraints.
Part Context
This component belongs to the LM1117 family of positive voltage regulators known for their robustness in battery-powered and portable electronics. The 'F' suffix specifically denotes the SOT-89 three-terminal surface-mount package, distinguishing it from the SOT-223 and TO-252 variants within the same product line.
Replacement Considerations
LM1117S-3.3 (SOT-223 package)
FAQ
What is the minimum output capacitance required for stability?
An output capacitor of 10 µF or larger is required to ensure the stability of the LM1117F-3.3 regulator.
How does the dropout voltage vary with load current?
The dropout voltage increases with load current, reaching approximately 1.2V at 1.0A output current, while being lower at reduced loads.
