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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ 5A TO3
- Series：-
- Mfr：STMicroelectronics
- Package：Tray
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：1.2V
- Voltage - Output (Max)：32V
- Voltage Dropout (Max)：-
- Current - Output：5A
- Current - Quiescent (Iq)：-
- Current - Supply (Max)：-
- PSRR：75dB ~ 60dB (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 LM138K is a three-terminal adjustable positive voltage regulator manufactured by STMicroelectronics. It provides an output current exceeding 5A with an adjustable output voltage range from 1.2V to 32V. The device features guaranteed line regulation of typically 0.005%/V and load regulation of typically 0.1%. It includes internal current limiting that remains constant with temperature variations. The component is housed in a standard 3-lead transistor package, ensuring robust performance comparable to commercial power supplies.
Feature Summary
- Adjustable output voltage capability spanning from 1.2V up to 32V
- Guaranteed continuous output current exceeding 5A with peak capability of 7A
- Internal current limiting mechanism that maintains consistency across temperature changes
Applications
- High-current linear power supply designs
- Adjustable voltage regulation circuits
- Commercial power supply replacements
Procurement Notes
Verify the manufacturer marking on the component body to confirm STMicroelectronics origin, as National Semiconductor also produced this part number. Ensure the TO-3 package variant matches your thermal management requirements. Cross-reference datasheet revisions to confirm specific electrical tolerances for your design constraints.
Selection Notes
Select this regulator when high current handling above 5A is required alongside precise voltage adjustability. The TO-3 metal package offers superior heat dissipation compared to plastic packages. Consider the input-to-output differential voltage to manage power dissipation within the 50W limit specified for the steel version.
Part Context
This component belongs to the LM138 family of three-terminal adjustable regulators, which includes variants like LM238 and LM338 for different temperature grades. The LM138K specifically denotes the military-grade or high-reliability version often associated with Texas Instruments production, though STMicroelectronics also lists this part number in their portfolio for similar applications.
Replacement Considerations
LM238K
FAQ
What is the minimum output voltage for the LM138K?
The LM138K can be adjusted down to an output voltage of 1.2V.
Does the current limit vary with temperature?
No, the LM138K features internal current limiting that is guaranteed to remain constant with temperature.
