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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ 3A TO3
- Series：-
- Mfr：STMicroelectronics
- Package：Bulk
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：1.2V
- Voltage - Output (Max)：25V
- Voltage Dropout (Max)：-
- Current - Output：3A
- Current - Quiescent (Iq)：-
- Current - Supply (Max)：-
- PSRR：86dB ~ 65dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-25°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 LM250K is a three-terminal adjustable linear voltage regulator manufactured by STMicroelectronics, housed in a TO-3 package. It guarantees a maximum output current of 3A with an adjustable output voltage range from 1.2V to 25V. The device supports a maximum input-output differential voltage of 35V and operates within a junction temperature range of -25°C to 150°C. Electrical characteristics include typical line regulation of 0.005%/V and load regulation of 0.1%. Ripple rejection is rated at 65dB at 120Hz, increasing to 86dB with a 10µF bypass capacitor.
Feature Summary
- Provides guaranteed 3A continuous output current capability
- Features fully adjustable output voltage down to 1.2V
- Includes internal thermal overload and short-circuit protection
- Maintains constant current limit performance across varying temperatures
Applications
- General-purpose power supply circuits requiring adjustable voltage
- Local voltage regulation for card distribution systems
- Power management in industrial equipment
- Battery chargers and test equipment power stages
Procurement Notes
Verify component authenticity through authorized channels as the LM250K is listed as obsolete. Confirm that the specific ordering code matches the required temperature grade (-25°C to 150°C) and package type (TO-3). Ensure design compatibility with legacy hardware requirements before procurement.
Selection Notes
Select this component when high current handling and robust thermal performance are required in a standard transistor package. Consider the TO-3 form factor for applications needing efficient heat dissipation without complex mounting solutions. Evaluate the need for external capacitors to optimize ripple rejection and transient response stability.
Part Context
The LM250K belongs to the LMx50 series of three-terminal adjustable regulators produced by STMicroelectronics. This family shares common architectural features but differs in operating temperature ranges and reliability specifications. The 'K' suffix specifically denotes the TO-3 package variant designed for higher power dissipation applications.
Replacement Considerations
LM250C
FAQ
What is the minimum load current requirement for stable operation?
The device requires a minimum load current of 3.5mA to maintain proper regulation.
How does the adjustment pin current affect output accuracy?
The adjustment pin current is typically 100µA and remains very constant with line and load changes to minimize error terms in the output voltage calculation.
