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Product Detailed Parameters
- Description：IC REG LINEAR 1.2V 1A DPAK
- Series：-
- Mfr：STMicroelectronics
- 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)：1.2V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：80dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：DPAK
- Grade：-
- Qualification：-
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Overview
The LD1117ADT12TR is a positive fixed-output low dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.2V with a maximum output current of 1A. The device operates within an input voltage range up to 15V and features a typical dropout voltage of 1.1V at 100mA load. Key electrical specifications include a quiescent current of 5mA, a power supply rejection ratio (PSRR) of 75dB at 120Hz, and line regulation of 6mV/V. It is housed in a surface-mount DPAK (TO-252-3) package and supports an operating temperature range from 0°C to +125°C.
Feature Summary
- Integrated thermal overload protection and current limiting for robust operation under fault conditions
- High power supply rejection ratio suitable for noise-sensitive applications
- Optimized thermal characteristics via surface mount packaging design
Applications
- Battery-powered equipment requiring efficient voltage regulation
- Post-regulators for switching power supplies
- Embedded control circuits in consumer electronics
Procurement Notes
Verify the specific suffix 'DT' confirms the DPAK package and '12' indicates the 1.2V fixed output. Confirm RoHS compliance status as per the latest manufacturer documentation. Ensure the ordering quantity matches the reel size requirements for automated assembly processes. Cross-reference the datasheet revision date to ensure compatibility with current design constraints.
Selection Notes
Select this component when a stable 1.2V rail is required with up to 1A load capability. The DPAK package offers a balance between thermal performance and board space efficiency compared to smaller SOT packages. Consider the 1.1V dropout voltage at lower currents when determining the minimum required input voltage headroom for the specific application circuit design.
Part Context
This part belongs to the LD1117 family of low dropout regulators known for high efficiency due to NPN pass transistors. Unlike PNP-based regulators, the quiescent current primarily flows into the load, improving overall system efficiency. The family includes adjustable versions and various fixed voltages, with the LD1117ADT12TR representing the fixed 1.2V variant in the DPAK surface-mount form factor.
Replacement Considerations
Direct pin-compatible alternatives within the same series include other LD1117 variants with different output voltages or packages. Verify that substitute parts maintain the same 1.2V output and 1A current rating. Check if alternative packages like SOT-223 offer sufficient thermal dissipation for the specific PCB layout.
