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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ 1A TO39-3
- Series：LM140
- Mfr：National Semiconductor
- Package：Bulk
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：5V
- Voltage - Output (Max)：15V
- Voltage Dropout (Max)：2V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：6 mA
- Current - Supply (Max)：-
- PSRR：-
- Control Features：Current Limit
- Protection Features：Over Temperature, Short Circuit
- Operating Temperature：-55°C ~ 125°C (TA)
- Mounting Type：Through Hole
- Package / Case：TO-205AD, TO-39-3 Metal Can
- Supplier Device Package：TO-39-3
- Grade：-
- Qualification：-
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Overview
The LM140H-24/883 is a high-reliability, three-terminal positive voltage regulator manufactured by National Semiconductor. It provides a fixed 24V output with a maximum load current of 1.0A. The device features internal thermal overload protection and safe area compensation to ensure robust operation under fault conditions. Designed for military and aerospace applications, it meets the stringent requirements of MIL-PRF-38534 class H or K specifications, offering superior performance over standard commercial equivalents in harsh environments.
Feature Summary
- Provides a stable fixed 24V DC output voltage
- Capable of delivering up to 1.0A load current
- Includes internal thermal overload protection
- Features safe area compensation for reliability
Applications
- Military avionics power systems
- Aerospace electronic equipment
- High-reliability industrial control units
- Ruggedized communication infrastructure
Procurement Notes
Verify that the component carries the correct NSC marking and lot traceability required for MIL-PRF-38534 compliance. Ensure the package style matches the specific subcategory (e.g., ceramic DIP) defined in the purchase order. Request full test data reports if the application requires strict adherence to initial accuracy and temperature coefficient specifications beyond standard datasheet limits.
Selection Notes
Select this regulator when a fixed 24V supply is required in environments demanding high reliability and radiation hardness tolerance. It serves as a direct replacement for standard LM140 devices in critical systems where failure is not an option. Consider the thermal management requirements for 1.0A loads at higher input voltages to maintain efficiency and prevent overheating.
Part Context
This part belongs to the LM140 series of three-terminal positive regulators produced by National Semiconductor. The 'H' indicates a high-reliability grade, while '/883' denotes compliance with MIL-PRF-38534 standards. This series is widely used in defense and space applications where standard commercial components do not meet environmental or longevity requirements.
Replacement Considerations
Direct replacements include other MIL-PRF-38534 qualified LM140 variants from Texas Instruments or authorized manufacturers. Verify pinout compatibility and thermal resistance characteristics before substituting with commercial-grade LM140 parts, as they lack the enhanced reliability features.
