Part Number: 7808
Function: Three Terminal Positive Voltage Regulator ( 8V )
Pacakge : TO-220 Type
Manufacturer: Inchange Semiconductor
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Description
The 7808 is a fixed 8V three-terminal positive linear voltage regulator designed for stable DC power supply applications, commonly packaged in TO-220. It provides reliable voltage regulation with built-in protection features and consistent output performance across varying conditions. This regulator is widely used in power supplies, embedded systems, and analog circuits requiring a steady 8V rail.
Features
- Fixed output voltage of 8V
- Output current capability exceeding 1.5A
- Internal thermal overload protection
- Output transition safe-area compensation
- Short-circuit current limiting protection
- Low lot-to-lot variation for consistent performance
Absolute Maximum Ratings (Tc = 25 °C)
| Parameter | Symbol | Value | Unit |
| Input Voltage | VIN | 35 | V |
| Output Current | IO | 1.5 | A |
| Power Dissipation | Ptot | Internally Limited | – |
| Junction Temperature | Tj | 150 | °C |
| Storage Temperature | Tstg | -65 to 150 | °C |
Pinout
Design Notes
- Maintain input voltage at least 2V higher than output (dropout consideration)
- Use input and output capacitors (e.g., 0.33µF and 0.1µF) for stability
- Heat sinking is required for high current or high input-output voltage differential
- Thermal shutdown protects the device under overload conditions
- Ensure proper PCB layout to minimize noise and improve regulation
Typical Circuit Usage
- Linear regulated power supply stages
- Microcontroller and logic circuit power rails
- Analog signal conditioning circuits
- Battery-powered systems requiring regulated 8V output
- Post-regulation after DC-DC converters
How to Choose This Part
- Select when a fixed 8V output is required with simple implementation
- Ideal for low-noise analog applications compared to switching regulators
- Ensure thermal design is adequate for power dissipation
- Use when input voltage is within safe operating limits
- Not suitable for high-efficiency designs due to linear regulation losses
Applications
- Power adapters and regulated DC supplies
- Embedded systems and development boards
- Audio and instrumentation circuits
- Industrial control systems
- Consumer electronics power regulation
Alternative / Equivalent Products
- LM7808 (standard 8V regulator)
- L7808 (STMicroelectronics equivalent)
- KA7808 (Fairchild equivalent)
- UA7808 (Texas Instruments version)
- LM317 (adjustable voltage regulator alternative)
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7808 PDF Datasheet
