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Product Detailed Parameters
- Description：IC REG LINEAR 12V 3A TO220-3
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：18V
- Voltage - Output (Min/Fixed)：12V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.5V @ 3A
- Current - Output：3A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：60dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220-3
- Grade：-
- Qualification：-
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Overview
The LM1085IT-12/NOPB is a fixed-output low-dropout positive voltage regulator from Texas Instruments. It provides a stable 12V output with a maximum load current of 3A. The device features a maximum dropout voltage of 1.5V at full load and supports input voltages up to 29V. It operates within a junction temperature range of -40°C to 125°C and includes internal thermal shutdown and current limiting protection.
Feature Summary
- Provides a fixed 12V regulated output suitable for microprocessor power supplies
- Integrates thermal shutdown and current limiting for robust operation under fault conditions
- Delivers high ripple rejection through an internal feedback loop
Applications
- Microprocessor core voltage regulation
- Battery charger circuits
- Post-regulation for switching regulators
Procurement Notes
Verify the suffix NOPB indicates lead-free and RoHS compliance per manufacturer specifications. Confirm the IT package designation corresponds to the TO-220 form factor required for your thermal management design. Ensure the fixed 12V output matches the target system requirements, as adjustable variants exist within the same family.
Selection Notes
Select this component when a fixed 12V rail is required with up to 3A continuous current capability. It serves as a direct replacement for older LM317 designs where fixed output is preferred. Consider the thermal resistance of the TO-220 package and ensure adequate heatsinking if the input-to-output differential voltage results in significant power dissipation during operation.
Part Context
This part belongs to the LM1085 series of 3A low-dropout linear regulators. The series offers both fixed and adjustable versions in various packages. The LM1085IT-12/NOPB specifically denotes the fixed 12V output variant housed in a TO-220 package, designed for applications requiring simple, reliable linear regulation without external programming resistors.
Replacement Considerations
LM1085IT-12/NOPB is functionally equivalent to other manufacturers' 3A 12V LDOs in TO-220 packages. Verify pinout compatibility before substitution. No specific public substitute part numbers are confirmed in the provided documentation.
