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LM7808CT

Fixed 8V linear regulator, 1.5A, 10.5-35V input, TO-220

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Manufacturer Part：

LM7808CT

Package：

TO-220

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Description

Product Overview

The LM7808CT from Texas Instruments is a fixed 8V positive voltage regulator delivering up to 1.5A. Part of the LM78xx series, it provides a stable 8V output from 10.5-35V input with internal thermal and short-circuit protection. Packaged in TO-220.

Key Specifications

Output Voltage 8V (fixed)
Output Current 1.5A
Input Voltage 10.5V to 35V
Dropout Voltage 2V (typ at 1A)
Line Regulation 0.01%/V (typ)
Load Regulation 0.3%/A (typ)
Ripple Rejection 75dB (typ)
Package TO-220
Operating Temperature 0 to +125 C

Features

  • Fixed 8V output
  • 1.5A output current
  • Internal thermal overload protection
  • Internal short-circuit current limiting
  • 75dB ripple rejection
  • Same pinout as LM7805CT, LM7812CT

Applications

  • 8V power supply for analog circuits
  • Op-amp single-supply regulation
  • Relay and solenoid drive
  • Pre-regulation stage

The LM7808CT from Texas Instruments is a fixed 8V positive voltage regulator from the LM78xx series. It provides a stable 8V output at up to 1.5A from an input of 10.5V to 35V. The 8V output is commonly used for analog circuits, relay drives, and as an intermediate voltage for systems that need more than 5V but less than 12V. The 75dB ripple rejection cleans up noisy input supplies. Internal protection includes thermal shutdown and current limiting. The LM7808 shares the same TO-220 pinout and architecture with the LM7805 and LM7812, differing only in the internal resistor divider that sets the output voltage. For lower dropout at 8V, the LM1117-8.0 (1.1V dropout) or AMS1117-8.0 provides better performance in battery-powered applications.

The LM7808CT uses the same NPN pass transistor architecture as other LM78xx regulators. The internal resistor divider is set to produce 8V at the output. The error amplifier compares the divided output to the internal bandgap reference and drives the NPN pass transistor accordingly. The 2V dropout requires a minimum input of 10V for proper regulation. Power dissipation must be managed with a heatsink: at 1A load with 15V input, dissipation is (15-8) x 1 = 7W. The thermal shutdown protects against excessive junction temperature. The current limit of approximately 2.2A and safe-area compensation ensure reliable operation under fault conditions.

Pin Name Function
1 VIN Unregulated input voltage (10.5-35V)
2 GND Ground / common
3 VOUT Regulated 8V output
  • 8V analog circuit power supply for op-amp and ADC reference
  • Relay driver 8V rail from 12V or 24V industrial supply
  • Pre-regulator providing 8V for lower-voltage LDO post-regulation
  • Intermediate voltage regulation for systems between 5V and 12V
Model Manufacturer Key Difference
LM7805CT TI 5V output version
LM7812CT TI 12V output version
LM1117MP-8.0 TI LDO, 1.1V dropout, SOT-223
LM317T TI Adjustable, can set 8V with resistors
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