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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ 1.5A TO3
- Series：-
- Mfr：STMicroelectronics
- Package：Tray
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：40V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：37V
- Voltage Dropout (Max)：-
- Current - Output：1.5A
- Current - Quiescent (Iq)：5 mA
- Current - Supply (Max)：-
- PSRR：80dB ~ 65dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-55°C ~ 150°C
- Mounting Type：Through Hole
- Package / Case：TO-204AA, TO-3
- Supplier Device Package：TO-3
- Grade：-
- Qualification：-
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Overview
The LM117K is a monolithic integrated circuit positive adjustable voltage regulator manufactured by STMicroelectronics. It delivers an output current exceeding 1.5A with an adjustable output voltage range from 1.2V to 37V. The device features 0.1% line and load regulation, floating operation for high voltages, and complete protection including current limiting, thermal shutdown, and SOA control. It operates within a junction temperature range of -55°C to 150°C.
Feature Summary
- Monolithic integrated circuit designed as a positive adjustable voltage regulator
- Capable of supplying more than 1.5A of load current
- Output voltage adjustable over a 1.2 to 37V range via resistive divider
- Includes internal current limiting, thermal shutdown, and SOA control protections
Applications
- Positive adjustable voltage regulation
- Floating operation for high voltage supplies
- Precision current regulators
- Programmable output power supplies
Procurement Notes
Verify the specific package type against the datasheet ordering numbers, as the 'K' suffix corresponds to the TO-3 package. Confirm that the component meets the required operating temperature range of -55°C to 150°C for your application environment. Ensure input-output differential voltage does not exceed the absolute maximum rating of 40V during operation.
Selection Notes
Select this component when a robust, high-current adjustable regulator is needed for industrial or harsh environments. The LM117K supports floating operation, allowing regulation of high voltages relative to ground. Consider the TO-3 package for its thermal performance in high-power dissipation scenarios where other packages may be insufficient.
Part Context
The LM117K belongs to the LM117/217/317 family of three-terminal adjustable regulators produced by STMicroelectronics. While functionally similar to the LM317, the LM117 variant offers an extended military-grade temperature range. The 'K' designation specifically identifies the TO-3 metal can package version within this product line.
Replacement Considerations
LM217K (Extended temp), LM317K (Commercial temp). Verify package compatibility and temperature specifications before substitution.
FAQ
What is the maximum input-to-output differential voltage?
The absolute maximum input-to-output differential voltage is 40 V.
How is the output voltage adjusted?
The nominal output voltage is selected using only a resistive divider connected between the output and adjustment terminals.
What protections are included in the LM117K?
The device includes current limiting, thermal shutdown, and Safe Operating Area (SOA) control.
