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Product Detailed Parameters
- Description：IC REG LINEAR 15V 100MA TO3
- Series：-
- Mfr：National Semiconductor
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：15V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：2V @ 1A
- Current - Output：100mA
- Current - Quiescent (Iq)：3 mA
- Current - Supply (Max)：4.5 mA
- PSRR：72dB (120Hz)
- Control Features：-
- Protection Features：Over Temperature, Short Circuit
- Operating Temperature：-55°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-205AD, TO-39-3 Metal Can
- Supplier Device Package：TO-3
- Grade：-
- Qualification：-
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Overview
The LM140LAH-15 is a three-terminal positive voltage regulator manufactured by National Semiconductor. It provides a fixed output voltage of 15V with a maximum load current capability of 1.0A. The device utilizes an internal thermal overload protection mechanism to ensure reliability under fault conditions. It is housed in a ceramic dual-in-line package (CDIP) designed for high-reliability applications, featuring glass-sealed construction to withstand harsh environments and maintain performance stability over extended operational periods.
Feature Summary
- Fixed 15V output regulation
- 1.0A continuous load current capacity
- Internal thermal overload protection
- High-reliability ceramic DIP packaging
Applications
- Military and aerospace power systems
- Industrial control equipment requiring robust regulation
- Harsh environment instrumentation power supplies
Procurement Notes
Verify the manufacturer origin, as Texas Instruments acquired National Semiconductor. Confirm the specific suffix 'LAH' corresponds to the intended ceramic package and military-grade qualification level. Ensure the part number matches the exact voltage rating and current specifications required for the design. Cross-reference datasheets from both National Semiconductor archives and Texas Instruments to confirm pinout and electrical characteristics remain consistent across legacy documentation.
Selection Notes
Select this component when a fixed 15V supply is needed with 1A current capability in a ruggedized form factor. The ceramic package offers superior environmental sealing compared to plastic alternatives. Consider the thermal management requirements given the linear regulation topology. Verify that the input voltage range supports the necessary dropout voltage for stable operation at the desired load current.
Part Context
The LM140 series belongs to a family of three-terminal positive regulators known for their simplicity and robustness. The LM140LAH-15 specifically denotes the 15V variant within the high-reliability line. These regulators are widely used in applications where long-term stability and resistance to environmental stressors are critical, serving as a foundational power management solution in specialized electronic systems.
Replacement Considerations
LM340L-15: A similar three-terminal positive regulator offering 15V output. Verify package compatibility and current handling capabilities before substitution.
