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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 1A TO252-3
- 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-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：TO-252-3
- Grade：-
- Qualification：-
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Overview
The LM1117RS-3.3 is a fixed-output positive 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 low dropout voltage of 1.2V at full load and includes internal thermal overload and short-circuit current protection. Packaged in the TO-252 (DPAK) surface-mount format, it requires a minimum 10µF output capacitor for stability.
Feature Summary
- Delivers a fixed 3.3V output with high efficiency linear regulation capabilities
- Incorporates built-in thermal shutdown and current limiting circuitry for system safety
- Provides low dropout performance suitable for battery-powered applications
- Designed for surface-mount assembly using the TO-252 package
Applications
- Active SCSI terminators
- Portable and notebook computer power supplies
- High-efficiency linear regulators
- Post-regulators for switching mode power supplies
- Motherboard clock supply circuits
Procurement Notes
Verify that the component matches the specific TAEJIN manufacturing origin rather than other vendors producing the LM1117 series. Confirm the package marking corresponds to the TO-252 form factor and check the revision date on the datasheet to ensure compliance with the latest electrical specifications. Ensure the ordering suffix aligns with the required fixed 3.3V configuration.
Selection Notes
Select this regulator when a fixed 3.3V rail is required with up to 1A load capacity. Consider the TO-252 package for its thermal dissipation advantages over smaller packages like SOT-89. Evaluate the input-to-output voltage differential to calculate power dissipation and determine if a heat sink or adequate copper plane area is necessary to maintain junction temperatures within the specified limits.
Part Context
This component belongs to the LM1117 family of low-dropout linear regulators. While originally developed by National Semiconductor and widely produced by Texas Instruments, TAEJIN manufactures this variant under license or as a compatible alternative. The RS suffix specifically denotes the TO-252 surface-mount package, distinguishing it from the SOT-223 and SOT-89 variants available in the same product line.
Replacement Considerations
LM1117S-3.3
FAQ
What is the minimum output capacitance required for stability?
A minimum output capacitance of 10µF is required to ensure the stability of the LM1117RS-3.3.
How does the dropout voltage vary with load current?
The dropout voltage is typically 1.1V at 500mA and increases to 1.2V at the maximum rated output current of 1.0A.
