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Product Detailed Parameters
- Description：IC REG LINEAR 5V 3A TO3
- Series：-
- Mfr：STMicroelectronics
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：20V
- Voltage - Output (Min/Fixed)：5V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：3A
- Current - Quiescent (Iq)：-
- Current - Supply (Max)：-
- PSRR：-
- 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 LM123K is a three-terminal positive voltage regulator from the LM123 series, manufactured by STMicroelectronics. It provides a fixed 5V output with a load driving capability of 3A. The device features internal current and thermal limiting for protection. Key electrical parameters include a typical output impedance of 0.01 Ω, a minimum input voltage of 7.5V, and a power dissipation rating of 30W. The operating junction temperature range is -55°C to 150°C. It utilizes TO-3 packaging.
Feature Summary
- Provides a preset 5V output with high load driving capability
- Includes internal current limiting and thermal shut-down protection
- Designed for reliable performance under combined stress conditions
Applications
- General purpose positive voltage regulation
- Power supply systems requiring 3A current capacity
- Equipment needing robust overload protection
Procurement Notes
Verify the specific ordering suffix K corresponds to the TO-3 package and the -55°C to 150°C temperature range as defined in the official datasheet. Confirm that the component is sourced directly from authorized channels to ensure authenticity. Check for any updated revision history or supplementary application notes that may affect integration. Ensure the procurement documentation matches the manufacturer's part identification exactly.
Selection Notes
Select this component when a fixed 5V output at 3A is required with integrated protection features. Consider the TO-3 package size and thermal resistance characteristics for heat dissipation planning. Evaluate the minimum input voltage requirement of 7.5V against the available supply rails. Assess the need for internal current and thermal limiting versus external protection circuits.
Part Context
The LM123K belongs to the LM123/LM223/LM323 family of three-terminal positive voltage regulators. These devices share common circuit design techniques to deliver high output current while maintaining regulation characteristics. The LM123 variant specifically covers the industrial temperature range, distinguishing it from commercial and military grade options within the same functional family.
Replacement Considerations
LM223K and LM323K are functionally similar regulators within the same series, differing primarily in operating temperature ranges. Verify compatibility regarding thermal management and environmental specifications before substitution.
