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Product Detailed Parameters
- Description：IC REG LINEAR 9V 1.5A TO220
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：9V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：2V @ 1A (Typ)
- Current - Output：1.5A
- Current - Quiescent (Iq)：8 mA
- Current - Supply (Max)：-
- PSRR：55dB (120Hz)
- Control Features：-
- Protection Features：Over Temperature, Short Circuit
- Operating Temperature：0°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220
- Grade：-
- Qualification：-
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Overview
The L7809CF is a positive linear voltage regulator from the STMicroelectronics L78 series, housed in a TO-220AB package. It provides a fixed output voltage of 9 V with a maximum output current of 1.5 A. The device supports an input voltage range up to 35 V and operates within a temperature range of -40 °C to +125 °C. Internal protections include thermal shutdown and safe area protection.
Feature Summary
- Fixed 9 V output voltage regulation
- Internal thermal overload protection
- Short-circuit current limiting
- Safe area protection for robust operation
Applications
- General-purpose power supply conditioning
- Local on-card regulation for digital logic circuits
- Battery charging systems requiring stable voltage reference
Procurement Notes
Verify the exact suffix (e.g., CF vs CV) against the manufacturer's official datasheet to ensure correct packaging and temperature rating specifications. Confirm RoHS compliance status and lifecycle stage directly with authorized distributors or STMicroelectronics before procurement, as availability and revision levels may vary by region.
Selection Notes
Select this component when a fixed 9 V output at up to 1.5 A is required in a through-hole TO-220 package. Ensure the input voltage remains within the 35 V maximum limit and that adequate heat sinking is provided to manage power dissipation under load conditions exceeding typical low-current scenarios.
Part Context
Part of the widely adopted L78xx family of three-terminal linear regulators. Designed for simplicity and reliability in basic voltage regulation tasks. The L7809CF specifically denotes the 9 V variant in the commercial/industrial grade lineup, offering standard performance characteristics consistent with the broader L78 series architecture.
Replacement Considerations
Compatible equivalents include the LM7809 and MC7809. Verify pinout compatibility and thermal resistance values when substituting to ensure proper board layout and heat dissipation requirements are met without redesigning the enclosure or heatsink interface.
