MC78xxCT Series
Vishay Semiconductor
Document Number 74813 www.vishay.com
29-Nov-01 1
New Product
3-Terminal Fixed Positive Voltage Regulators
Description
These voltage regulators are monolithic integ r ated circuits
designed as fixed-voltage regulators for a wide variety of
applications including local, on-card regulation. These
regulators employ internal current limiting, thermal shut-
down, and safe-area compensation. With adequate
heatsinking the MC78xxCT can deliver output currents in
excess of 1.5 ampere.
Although designed primar ily as a fixed voltage regulator,
these devices can be used with external components to
obtain adjustable voltages with currents.
Features
• Output current in excess of 1.0 ampere
• No exter nal components required
• Internal ther mal overload protection
• Internal short-circuit current limiting
• Output transistor safe-area compensation
• Output voltage offered in 2% tolerance
Mechanical Data
Case: TO-220 Package
Case outline is on the back page.
GND
Input
1
Output
3
2
Reference
Voltage
Starting
Circuit Error
Amplifier
Current
Generator SOA
Protection
Thermal
Protection
Series
Pass
Element
Internal Block Diagram
Output
Input
Cin
0.33µF
MC78xx
Co
0.1µF
Standard Application
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.
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.
Co is not needed for stability, however, it does improve transient response.
123
MC78xxCT
TO-220AB
Pin Definition
1. Input
2. Ground
3. Output
(Heatsink/tab
connected to pin 2)
MC78xxCT Series
Vishay Semiconductor
www.vishay.com Document Number 74813
229-Nov-01
Electrical Characteristics – MC7805
Vin = 10V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 4.90 5 5.10 V
7V ≤Vin ≤20V, 4.85 —5.15
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 7V ≤Vin < 25V –3 100 mV
(TJ= 25°C) 8V ≤Vin < 13V –150
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –15 100 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –550
Quiescent Current IqIout = 0, TJ= 25°C—4.2 8 mA
Quiescent Current Change ∆Iq7V ≤Vin ≤25V ——1.3 mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—40 —µV
Ripple Rejection Ratio RR f = 120Hz 62 78 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —17 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—750 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–1.1 —mV/°C
Maximum Ratings Ratings at 25°C ambient temperature unless otherwise specified.
Parameter Symbol Value Unit
Input Voltage(1) Vin 30 V
Input Voltage(2) Vin 40 V
Thermal Resistance(3) RθJC 5°C/W
Operating Junction Temperature Range TJ–20 to +150 °C
Storage Junction Temperature Range Tstg –65 to +150 °C
Notes: (1) MC7805 to MC7818
(2) MC7824
(3) Follow the derating curve (fig. 1)
MC78xxCT Series
Vishay Semiconductor
Document Number 74813 www.vishay.com
29-Nov-01 3
Electrical Characteristics – MC7806
Vin = 11V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 5.88 6.0 6.12 V
8V ≤Vin ≤21V, 5.83 —6.17
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 8V ≤Vin < 25V –5 120 mV
(TJ= 25°C) 9V ≤Vin < 13V –1.5 60
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –14 120 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –460
Quiescent Current IqIout = 0, TJ= 25°C—4.3 8.0 mA
Quiescent Current Change ∆Iq8V ≤Vin ≤25V ——1.3 mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TA=25°C—45 —µV
Ripple Rejection Ratio RR f = 120Hz, 9V ≤Vin ≤19V 59 75 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —19 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—550 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–0.8 —mV/°C
Electrical Characteristics – MC7808
Vin = 14V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 7.84 8.0 8.16 V
10.5V ≤Vin ≤23V, 7.74 —8.26
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 10.5V ≤Vin < 25V –6 160 mV
(TJ= 25°C) 11V ≤Vin < 15V –280
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –12 160 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –480
Quiescent Current IqIout = 0, TJ= 25°C—4.3 8.0 mA
Quiescent Current Change ∆Iq10.5V ≤Vin ≤25V —— 1mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—52 —µV
Ripple Rejection Ratio RR f = 120Hz 56 72 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —16 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—450 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–0.8 —mV/°C
MC78xxCT Series
Vishay Semiconductor
www.vishay.com Document Number 74813
429-Nov-01
Electrical Characteristics – MC7809
Vin = 15V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 8.82 9 9.18 V
11.5V ≤Vin ≤24V, 8.77 —9.23
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 11.5V ≤Vin < 27V –6 160 mV
(TJ= 25°C) 12V ≤Vin < 16V –280
Load Regulation ∆REGload 5mA ≤Iout < 1.5A –12 160 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –480
Quiescent Current IqIout = 0, TJ= 25°C—4.3 8 mA
Quiescent Current Change ∆Iq11.5V ≤Vin ≤27V —— 1mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—52 —µV
Ripple Rejection Ratio RR f = 120Hz,12V ≤Vin ≤22V 55 72 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —16 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—450 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–1—mV/°C
Electrical Characteristics – MC7810
Vin = 16V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 9.8 10 10.2 V
12.5V ≤Vin ≤25V, 9.75 —10.25
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 12.5V ≤Vin < 28V –10 240 mV
(TJ= 25°C) 13V ≤Vin < 17V –3 120
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –12 240 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –4 120
Quiescent Current IqIout = 0, TJ= 25°C—4.3 8 mA
Quiescent Current Change ∆Iq12.5V ≤Vin ≤28V —— 1mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—52 —µV
Ripple Rejection Ratio RR f = 120Hz, 13V ≤Vin ≤23V 54 72 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —16 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—450 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–1—mV/°C
MC78xxCT Series
Vishay Semiconductor
Document Number 74813 www.vishay.com
29-Nov-01 5
Electrical Characteristics – MC7812
Vin = 19V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 11.76 12.0 12.24 V
14.5V ≤Vin ≤27V, 11.66 —12.34
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 14V ≤Vin < 30V –10 240 mV
(TJ= 25°C) 15V ≤Vin < 19V –3 120
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –12 240 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –4 120
Quiescent Current IqIout = 0, TJ= 25°C—4.3 8 mA
Quiescent Current Change ∆Iq14.5V ≤Vin ≤30V —— 1mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—75 —µV
Ripple Rejection Ratio RR f = 120Hz,15V ≤Vin ≤25V 55 71 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —18 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—350 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–1—mV/°C
Electrical Characteristics – MC7815
Vin = 23V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 14.7 15.0 15.3 V
17.5V ≤Vin ≤30V, 14.55 —15.45
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 17.5V ≤Vin < 30V –11 300 mV
(TJ= 25°C) 13V ≤Vin < 17V –3 150
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –12 300 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –4 150
Quiescent Current IqIout = 0, TJ= 25°C—4.4 8 mA
Quiescent Current Change ∆Iq17.5V ≤Vin ≤30V —— 1mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—90 —µV
Ripple Rejection Ratio RR f = 120Hz, 18V ≤Vin ≤28V 54 70 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —19 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—230 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–1—mV/°C
MC78xxCT Series
Vishay Semiconductor
www.vishay.com Document Number 74813
629-Nov-01
Electrical Characteristics – MC7818
Vin = 27V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 17.64 18.0 18.36 V
21V ≤Vin ≤33V, 17.44 —18.56
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 21V ≤Vin < 33V –15 360 mV
(TJ= 25°C) 22V ≤Vin < 26V –5 180
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –12 360 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –4 180
Quiescent Current IqIout = 0, TJ= 25°C—4.5 8 mA
Quiescent Current Change ∆Iq21V ≤Vin ≤33V —— 1mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—110 —mV
Ripple Rejection Ratio RR f = 120Hz,21V ≤Vin ≤31V 53 69 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —22 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—200 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–1—mV/°C
Electrical Characteristics – MC7824
Vin = 33V, I
out
= 500mA, 0°C ≤T
J
≤125°C, Cin = 0.33µF, C
out
= 0.1µF; unless otherwise noted.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage Vout
TJ= 25°C 23.52 24.0 24.48 V
26V ≤Vin ≤38V, 23.32 —24.68
5mA ≤Iout ≤1.0A,PD≤15W
Line Regulation ∆REGline 26V ≤Vin < 38V –18 480 mV
(TJ= 25°C) 27V ≤Vin < 32V –6 240
Load Regulation ∆REGload 10mA ≤Iout < 1.5A –12 480 mV
(TJ= 25°C) 250mA ≤Iout < 750mA –4 240
Quiescent Current IqIout = 0, TJ= 25°C—4.6 8 mA
Quiescent Current Change ∆Iq26V ≤Vin ≤38V —— 1mA
5mA ≤Iout ≤1.0A ——0.5
Output Noise Voltage Vn 10Hz≤f≤100KHz,TJ=25°C—170 —µV
Ripple Rejection Ratio Rrej f = 120Hz, 26V ≤Vin ≤36V 50 66 —dB
Dropout Voltage Vdrop Iout = 1.0A, TJ= 25°C—2—V
Output Resistance Rout f = 1KHz —28 —mΩ
Output Shor t Circuit Current Ios TJ= 25°C—150 —mA
Peak Output Current Io peak TJ= 25°C—1.5 —A
Temperature Coefficient of Output Voltage ∆Vout/∆TJIout =5mA,0°C≤TJ≤125°C—–1.5 —mV/°C
MC78xxCT Series
Vishay Semiconductor
Document Number 74813 www.vishay.com
29-Nov-01 7
Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
8.0
16
20
12
0 25 50 75 100 125 150
Fig. 1 – Power Dissipation vs.
Ambient Temperature (MC78xxCT)
Power Dissipation (W)
Ambient Temperatue (°C)
4.0
00.5
1.0
1.5
2.0
0 25 50 75 100 125
Fig. 2 – Dropout Voltage
vs. Junction Temperature
VIN -- VOUT, Input - Output
Voltage Differential (V)
2.5
0 6.0 12 18 24 30
Fig. 3 – Peak Output Current
Io -- Output Current (A)
Input -- Output Voltage Differential (V)
0.75
1.50
2.25
3.00
4.0 6.0 8.0 10 12 14 16 18 20 22 24
Fig. 4 –Ripple Rejection Ratio
vs. Output Voltage
RR -- Ripple Rejection (db)
Vo -- Output Voltage (V)
40
50
60
70
80
4.0 8.0 12 16 20 24
Fig. 5 – Output Impedance (mΩ)
vs. Output Voltage
Vo -- Output Voltage (V)
10
100
1000
0
f = 120Hz
Io = 20mA
˘Vin = 1.0V (RMS)
Io = 500mA
Io = 200mA
Io = 20mA
Io = 0mA
Io = 1.0A
f = 120Hz
Io = 500mA
CL = OuF
θJC = 5°C/W
θJA = 65°C/W
TJ (max) = 150°C
θHS = 5°C/W
θHS = 15°C/W
No Heatsink
TJ = --40°C
TJ = 0°C
TJ = 25°C
TJ = 125°C
Part # / Vin
7805 / 10V
7806 / 11V
7808 / 14V
7812 / 19V
7815 / 23V
7818 / 27V
7824 / 33V
--75 --50 --25 0 25 50 100 125 150 175 200
Fig. 6 – Output Voltage
vs. Junction Temperature
Vo -- Output Voltage (V)
TJ -- Junction Temperature (°C)
5.90
6.00
6.10
6.20
5.80
Vin = 10V
Vo = 6.0V
Io = 20mA
MC78xxCT Series
Vishay Semiconductor
www.vishay.com Document Number 74813
829-Nov-01
Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
0255075--75 --50 --25 100 125
IB -- Quiescent Current (mA)
TJ -- Junction Temperature (°C)
1.0
2.0
3.0
4.0
5.0
4.02.00 6.0 8.0 10 12 14 16
VO -- Output Voltage (V)
VI -- Input Voltage (V)
0
2.0
4.0
6.0
8.0
0
Io = 10mA
Io = 500mA
Vin = 10V
Vo = 5.0V
Io = 20mA
Vin = 10V
Vo = 5.0V
Io = 5.0mA Io = 1.0A
MC78xxC MC7805
TJ = 25°C
MC78xx
Fig. 7 – Quiescent Current
vs. Junction Temperature Fig. 8 – Output Voltage
vs. Input Voltage
MC78xxCT Series
Vishay Semiconductor
Document Number 74813 www.vishay.com
29-Nov-01 9
13.9 ± 0.41
2.53 ± 0.185
3.84 ± 0.6 Dia.
10.25 ± 0.25
28.7 ± 0.92
3.94 ± 0.375
2.69 ± 0.25
0.8 ± 0.12
1.3 ± 0.185
1.27 ± 0.12
2.55 ± 0.375
4.85 ± 0.375
0.387 ± 0.09
8.54 ± 0.26
6.26 ± 0.25
14.8 ± 0.51
TO-220 Case Outline
Dimensions in millimeters
