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Product Detailed Parameters
- Description：IC REG LINEAR -9V 1.5A TO220
- Series：L79
- Mfr：Lumimax Optoelectronic Technology
- Package：Bulk
- Output Configuration：Negative
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：-35V
- Voltage - Output (Min/Fixed)：-9V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.5V @ 1A
- Current - Output：1.5A
- Current - Quiescent (Iq)：5 mA
- Current - Supply (Max)：-
- PSRR：60dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：-25°C ~ 125°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220
- Grade：-
- Qualification：-
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Overview
The L7909 is a negative fixed linear voltage regulator IC manufactured by Lumimax Optoelectronic Technology. It provides a stable -9V output with a maximum current capacity of 1.5A. The device utilizes the TO-220 through-hole package for mounting. Key electrical specifications include a quiescent current of 8 mA and a power supply rejection ratio (PSRR) of 60dB at 120kHz. Integrated protection features include over-current and thermal shutdown capabilities to ensure reliable operation under varying load conditions.
Feature Summary
- Maintains constant negative output voltage despite input or load variations
- Integrated over-current and thermal protection mechanisms
- Designed for through-hole mounting applications
Applications
- General purpose negative voltage regulation in electronic circuits
- Power supply modules requiring stable -9V rails
- Industrial equipment utilizing linear regulation topologies
Procurement Notes
Verify the manufacturer designation on the component marking, as Lumimax acts as a distributor for this specific part number sourced from other manufacturers. Confirm the package type matches the required TO-220 form factor. Ensure the application environment does not exceed the specified thermal limits without adequate heat sinking. Cross-reference the datasheet for exact pinout configurations before integration into the design.
Selection Notes
Select this component when a fixed -9V output is required with up to 1.5A load capability. Consider the TO-220 package size constraints for the enclosure design. Evaluate thermal management requirements based on the input-output voltage differential and load current. Verify that the 60dB PSRR meets the noise sensitivity requirements of the downstream circuitry.
Part Context
This component belongs to the family of negative linear voltage regulators. It serves as a solution for providing stable negative DC voltages in systems where low noise and simple implementation are prioritized over high efficiency. The TO-220 package allows for direct heatsinking to manage power dissipation effectively in medium-power applications.
Replacement Considerations
Compatible substitutes include the L7909CV and generic L79xx series regulators offering identical -9V outputs. Verify pin compatibility and thermal performance characteristics when substituting.
