MC78xxCT Series
New Product
Vishay Semiconductor
3-Terminal Fixed Positive Voltage Regulators
MC78xxCT
TO-220AB
1
2
Description
Pin Definition
1. Input
2. Ground
3. Output
(Heatsink/ tab
connected to pin 2)
3
These voltage regulators are monolithic integrated circuits
designed as fixed-voltage regulators for a wide variety of
applications including local, on-card regulation. These
regulators employ internal current limiting, thermal shutdown, and safe-area compensation. With adequate
heatsinking the MC78xxCT can deliver output currents in
excess of 1.5 ampere.
Although designed primarily as a fixed voltage regulator,
these devices can be used with external components to
obtain adjustable voltages with currents.
Standard Application
Input
Output
MC78xx
Features
• Output current in excess of 1.0 ampere
Co
0.1µF
Cin
0.33µF
• No external components required
• Internal thermal overload protection
• Internal short-circuit current limiting
• Output transistor safe-area compensation
Notes:
A common ground is required between the input and the output voltages.
The input voltage must remain typically 2.0V above the output voltage
even during the low point on the input ripple voltage.
• Output voltage offered in 2% tolerance
Mechanical Data
Case: TO-220 Package
xx = these two digits of the part number indicate output voltage.
Cin is required if regulator is located an appreciable distance from power
supply filter.
Case outline is on the back page.
Co is not needed for stability, however, it does improve transient response.
Internal Block Diagram
Input
Series
Pass
Element
1
Current
Generator
Starting
Circuit
Reference
Voltage
Output
3
SOA
Protection
Error
Amplifier
Thermal
Protection
GND
2
Document Number 74813
29-Nov-01
www.vishay.com
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