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Product Detailed Parameters
- Description：IC REG LINEAR 18V 2A TO220
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：18V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：-
- Current - Output：2A
- Current - Quiescent (Iq)：8 mA
- Current - Supply (Max)：-
- PSRR：43dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：0°C ~ 150°C
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220
- Grade：-
- Qualification：-
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Overview
The L78S18CV is a three-terminal positive linear voltage regulator from the STMicroelectronics L78S series. It provides a fixed output voltage of 18 V with a maximum output current capability of 2 A. The device supports an input voltage range up to a maximum of 40 V and operates within a junction temperature range of 0 °C to +150 °C. It is housed in a TO-220 package, featuring internal protections including thermal overload shutdown, short-circuit protection, and safe area operation limits.
Feature Summary
- Provides local on-card regulation for power distribution systems
- Integrates internal thermal overload protection and short-circuit limiting
- Ensures safe area operation protection against excessive power dissipation
Applications
- Local on-card regulation in electronic equipment
- General-purpose positive voltage regulation circuits
- Power supplies requiring fixed 18 V output at high currents
Procurement Notes
Verify the specific suffix 'CV' corresponds to the TO-220 package and standard tolerance variant as per the official datasheet. Confirm that the 2 A output rating requires adequate external heat sinking to maintain operation within the specified thermal limits. Ensure the application input voltage remains below the 40 V absolute maximum rating.
Selection Notes
Select this component when a fixed 18 V output is required with current capabilities exceeding the standard 1 A limit of the L78xx family. The TO-220 package facilitates through-hole mounting and effective thermal management. Consider the L78L or L78M variants if lower current requirements allow for smaller surface-mount packages.
Part Context
This part belongs to the L78S series, which extends the traditional L78xx line with higher current handling capabilities. While the standard L78xx regulators typically support up to 1.5 A, the L78S series is designed to deliver up to 2 A, making it suitable for more demanding power applications while retaining the same simple three-terminal interface.
Replacement Considerations
Compatible substitutes include other manufacturers' 3-terminal positive regulators rated for 18 V output and 2 A current in a TO-220 package. Verify pinout compatibility and thermal resistance specifications before substitution.
