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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 1.35A SOT-223
- Series：-
- Mfr：Diotec Semiconductor
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.25V @ 1A
- Current - Output：1.35A
- 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-261-4, TO-261AA
- Supplier Device Package：SOT-223
- Grade：-
- Qualification：-
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Overview
The Diotec Semiconductor LDI1117-3.3H is a fixed-output low dropout linear voltage regulator housed in a SOT-223 surface-mount package. It provides a nominal output voltage of 3.3 V with a maximum tolerance of 1%. The device supports a continuous output current of 1.35 A and accepts input voltages up to 15 V. Key electrical parameters include a maximum dropout voltage of 1.25 V at full load, a typical power supply rejection ratio of 75 dB at 120 Hz, and a quiescent current of 10 mA. It operates within a junction temperature range of -40°C to +125°C.
Feature Summary
- Integrates overcurrent protection and thermal shutdown mechanisms for enhanced circuit reliability.
- Delivers stable regulated output with high ripple rejection capabilities across operating frequencies.
- Designed for efficient power management in space-constrained surface-mount applications.
Applications
- Portable battery-powered equipment requiring efficient linear regulation.
- Communication systems utilizing low noise power supplies.
- Consumer electronics needing compact voltage regulation solutions.
- Industrial control modules requiring robust thermal performance.
Procurement Notes
Verify the specific suffix 'H' against official Diotec documentation to confirm the exact package variant and compliance status. Ensure that the required output current and thermal dissipation requirements align with the SOT-223 package limitations. Cross-reference the manufacturer part number with authorized distributors to confirm availability and authenticity before finalizing procurement orders.
Selection Notes
Select this component when a fixed 3.3 V rail is required with up to 1.35 A capacity in a SOT-223 footprint. Consider the 15 V maximum input rating and 1.25 V dropout characteristic for headroom calculations. Evaluate thermal management needs based on the power dissipation at the expected load current and ambient temperature conditions.
Part Context
This regulator belongs to the LDI1117 series from Diotec Semiconductor, designed as a general-purpose positive voltage regulator. The series offers various fixed output voltages and packaging options, including SOT-89 variants like the LDI1117-3.3U. The LDI1117-3.3H specifically utilizes the SOT-223 case outline for higher current handling compared to smaller packages.
Replacement Considerations
The LDI1117-3.3U serves as a package-compatible alternative within the same product family, offering identical electrical specifications but housed in a SOT-89 enclosure. Verify pinout compatibility and thermal characteristics when substituting between these two package types.
