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MC78T00 Series
3.0 A Positive Voltage
Regulators
This family of fixed voltage regulators are monolithic integrated
circuits capable of driving loads in excess of 3.0 A. These
three−terminal regulators employ internal current limiting, thermal
shutdown, and safe−area compensation. Devices are available with
improved specifications, including a 2% output voltage tolerance, on
AC−suffix 5.0 V, 12 V and 15 V device types.
Although designed primarily as a fixed voltage regulator, these
devices can be used with external components to obtain adjustable
voltages and currents. This series of devices can be used with a
series−pass transistor to supply up to 15 A at the nominal output
voltage.
Output Current in Excess of 3.0 A
Power Dissipation: 25 W
No External Components Required
Output Voltage Offered in 2% and 4% Tolerance*
Thermal Regulation is Specified
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe−Area Compensation
Pb−Free Packages are Available
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Input
Cin*
0.33 mF
MC78TXX
Output
CO**
Figure 1. Simplified Application
A common ground is required between the input and the output voltages. The input voltage
must remain typically 2.2 V above the output voltage even during the low point on the input
ripple voltage.
XX these two digits of the type number indicate voltage.
** Cin is required if regulator is located an appreciable distance from power supply filter.
** (See Applications Information for details.)
** CO is not needed for stability; however, it does improve transient response.
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3A
POSITIVE FIXED
VOLTAGE REGULATORS
MARKING
DIAGRAMS
TO−220
T SUFFIX
CASE 221A
MC
78TxxyzT
AWLYWW
1
2
3
Pin 1. Input
2. Ground*
3. Output
*Heatsink surface is connected to Pin 2.
D2PAK−3
CASE 936
MC
78TxxyzD2T
AWLYWW
MC = Specific Device Code
xx = Voltage Option
y = “A” letter for precise 2% regulators, not
used for standard 4% regulators.
z = temperature range, “B” for wide
temperature range, −40°C to +125°C, “C”
for standard temperature range,
0°C to +125°C.
A = Assembly Location
WL= Wafer Lot
Y = Year
W = Work Week
© Semiconductor Components Industries, LLC, 2004
March, 2004 − Rev. 4
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
1 Publication Order Number:
MC78T00/D

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MC78T00 Series
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input Voltage (5.0 V − 12 V)
Input Voltage (15 V)
VI 35 Vdc
40
Power Dissipation and Thermal Characteristics
Plastic Package (Note 1)
TA = +25°C
Thermal Resistance, Junction−to−Air
TC = +25°C
Thermal Resistance, Junction−to−Case
PD
RqJA
PD
RqJC
Internally Limited
65
Internally Limited
2.5
°C/W
°C/W
Storage Junction Temperature
Operating Junction Temperature Range
(MC78T00C, AC)
Tstg
+150
°C
TJ
0 to +125
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 3.0 A, 0°C TJ 125°C, PO Pmax (Note 2), unless otherwise noted.)
MC78T05AC
MC78T05C
Characteristics
Symbol Min Typ Max Min Typ Max
Unit
Output Voltage
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A;
5.0 mA IO 2.0 A, 7.3 Vdc Vin 20 Vdc)
VO Vdc
4.9 5.0 5.1 4.8 5.0 5.2
4.8 5.0 5.2 4.75 5.0 5.25
Line Regulation (Note 3)
Regline
3.0 25
3.0 25
(7.2 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
7.2 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C;
8.0 Vdc Vin 12 Vdc, IO = 3.0 A, TJ = +25°C;
7.5 Vdc Vin 20 Vdc, IO = 1.0 A)
mV
Load Regulation (Note 3)
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
Regload
− 10 30 − 10 30
− 15 80 − 15 80
mV
Thermal Regulation
(Pulse = 10 ms, P = 20 W, TA = +25°C)
Regtherm − 0.001 0.01
− 0.002 0.03 %VO/W
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
IB mA
− 3.5 5.0 − 3.5 5.0
− 4.0 6.0 − 4.0 6.0
Quiescent Current Change
(7.2 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
7.5 Vdc Vin 20 Vdc, IO = 1.0 A)
DIB
− 0.3 1.0 − 0.3 1.0
mA
Ripple Rejection
(8.0 Vdc Vin 18 Vdc, f = 120 Hz,
IO = 2.0 A, TJ = 25°C)
RR 62 75 − 62 75 −
dB
Dropout Voltage (IO = 3.0 A, TJ = +25°C)
Vin−VO
2.2 2.5
2.2 2.5
Vdc
Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C)
Vn
− 10 −
− 10 − mV/VO
Output Resistance (f = 1.0 kHz)
RO
− 2.0 −
− 20 −
mW
2. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
3. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately.
Pulse testing with low duty cycle is used.
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MC78T00 Series
ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 3.0 A, 0°C TJ 125°C, PO Pmax (Note 2), unless otherwise noted.)
MC78T05AC
MC78T05C
Characteristics
Symbol Min Typ Max Min Typ Max
Unit
Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C)
ISC
− 1.5 −
− 1.5 −
A
Peak Output Current (TJ = +25°C)
Imax − 5.0 − − 5.0 −
A
Average Temperature Coefficient of Output Voltage
TCVO
0.2
(IO = 5.0 mA)
− 0.2 − mV/°C
2. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
3. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately.
Pulse testing with low duty cycle is used.
ELECTRICAL CHARACTERISTICS (Vin = 13 V, IO = 3.0 A, 0°C TJ 125°C, PO Pmax (Note 4), unless otherwise noted.)
MC78T08C
Characteristics
Symbol
Min
Typ
Max
Unit
Output Voltage
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A;
5.0 mA IO 2.0 A, 10.4 Vdc Vin 23 Vdc)
Line Regulation (Note 5)
(10.3 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C
10.3 Vdc Vin 35 Vdc, IO = 1.0 A, TJ = +25°C
11 Vdc Vin 17 Vdc, IO = 3.0 A, TJ = +25°C
10.7 Vdc Vin 23 Vdc, IO = 1.0 A)
VO
7.7 8.0 8.3
7.6 8.0 8.4
Regline − 4.0 35
Vdc
mV
Load Regulation (Note 5)
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
Thermal Regulation
(Pulse = 10 ms, P = 20 W, TA = +25°C)
Regload
10 30
15 80
mV
Regtherm
0.002 0.03
%VO/W
Quiescent Current
(5.0 mA IO 3.0 A, TJ = +25°C)
(5.0 mA IO 3.0 A)
IB mA
− 3.5 5.0
− 4.0 6.0
Quiescent Current Change
(10.3 Vdc Vin 35 Vdc, IO = 5.0 mA, TJ = +25°C;
5.0 mA IO 3.0 A, TJ = +25°C;
10.7 Vdc Vin 23 Vdc, IO = 1.0 A)
DIB
− 0.3 1.0
mA
Ripple Rejection
(11 Vdc Vin 21 Vdc, f = 120 Hz, IO = 2.0 A, TJ = 25°C)
RR
60 71
dB
Dropout Voltage (IO = 3.0 A, TJ = +25°C)
Vin−VO
2.2 2.5
Vdc
Output Noise Voltage
(10 Hz f 100 kHz, TJ = +25°C)
Vn − 10 − mV/VO
Output Resistance (f = 1.0 kHz)
RO
− 2.0 −
mW
Short Circuit Current Limit
(Vin = 35 Vdc, TJ = +25°C)
ISC − 1.5 −
A
Peak Output Current (TJ = +25°C)
Imax − 5.0 −
A
Average Temperature Coefficient of Output Voltage (IO = 5.0 mA)
TCVO − 0.3 − mV/°C
4. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25 W.
5. Line and load regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account
separately.
Pulse testing with low duty cycle is used.
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