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Product Detailed Parameters
- Description：IC REG LINEAR -8V 1.5A TO220
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- Output Configuration：Negative
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：-35V
- Voltage - Output (Min/Fixed)：-8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.1V @ 1A (Typ)
- Current - Output：1.5A
- Current - Quiescent (Iq)：3 mA
- Current - Supply (Max)：-
- PSRR：60dB (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 L7908CV is a three-terminal negative linear voltage regulator from the L79xxC series, manufactured by STMicroelectronics. It provides a fixed output voltage of -8 V with an output current capability up to 1.5 A. The device accepts a DC input voltage ranging from -11.5 V to -23 V and operates within a junction temperature range of 0 °C to 150 °C. Key electrical characteristics include a typical quiescent current of 3 mA, a dropout voltage of 1.1 V at 1 A load, and a supply voltage rejection ratio of 60 dB at 120 Hz. It is housed in a TO-220-3 through-hole package.
Feature Summary
- Integrated thermal overload protection prevents damage during excessive heat generation.
- Built-in short circuit protection safeguards the component against output faults.
- Output transition SOA (Safe Operating Area) protection ensures stability under varying load conditions.
Applications
- Local on-card regulation for electronic circuits
- Split power supply systems requiring negative voltage rails
- General-purpose negative voltage regulation
Procurement Notes
Verify the specific order code suffix to confirm the exact package variant, as the L79xxC series includes options such as TO-220, TO-220FP, and D²PAK. Ensure that the selected part matches the required mechanical footprint and thermal dissipation capabilities for the target application environment.
Selection Notes
Select this component when a stable negative voltage rail is required for analog or digital circuits. It is particularly suitable for designs utilizing split power supplies where it complements positive regulators. Consider the thermal resistance values provided in the datasheet to determine if adequate heat sinking is necessary to sustain the maximum output current.
Part Context
The L7908CV belongs to the L79xxC family of negative voltage regulators produced by STMicroelectronics. This series is designed to provide local regulation, eliminating distribution issues associated with single-point regulation. The devices are available in multiple packages and fixed output voltages, making them versatile for various power management applications.
Replacement Considerations
Compatible substitutes within the same product line include L7908CD2T-TR and L7908CP. Verify pinout compatibility and package dimensions before substitution to ensure proper integration into existing PCB layouts.
FAQ
What is the maximum DC input voltage allowed for the L7908CV?
The absolute maximum DC input voltage for the L7908CV is -35 V.
Does the L7908CV include internal protection mechanisms?
Yes, the device features thermal overload protection, short circuit protection, and output transition Safe Operating Area (SOA) protection.
