NTE981
Integrated Circuit
Positive 3 Terminal Voltage Regulator, 100mA
Description:
The NTE981 is a positive 3terminal voltage regulator available in a TO92 type package. With ade-
quate heat sinking this device can deliver 100mA output current. Current limiting is included to limit
peak output current to safe value. Safe area protection for the output transistors is provided to limit
internal power dissipation. If internal power dissipation becomes too high for the heat sinking pro-
vided, the thermal shutdown circuit takes over preventing the IC from overheating.
When used as a zener diode/resistor combination replacement, the NTE981 usually results in an ef-
fective output impedance improvement of two orders of magnitude, and lower quiescent current.
These regulators can provide local on card regulation, eliminating the distribution problems
associated with single point regulation. Typical applications include use in logic systems, instrumen-
tation, HiFi, and other solid state electronic equipment. Although designed primarily as fixed voltage
regulator this device can be used with external components to obtain adjustment voltages and cur-
rents.
Features:
D
Output Voltage Tolerances of
5% over the Temperature Range
D
Output Current of 100mA
D
Internal Thermal Overload Protection
D
Output Transistor Safe Area Protection
D
Internal Short Circuit Current Limit
Absolute Maximum Ratings:
Output Voltage, V
OUT
8V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage, V
IN
30V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation (Note 1), P
D
Internally Limited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
0
C to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Junction Temperature, T
J
+125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
55
C to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (Soldering, 10 sec), T
L
+260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note 1. Thermal resistance is +180
C/W junctiontoambient with 0.4" leads from a P.C. board and
+160
C/W junctiontoambient with 0.125" lead length to a P.C. board.
Electrical Characteristics: (T
J
= 0
to +125
C, V
IN
= 14V, I
O
= 40mA, C
IN
= 0.33
F, C
O
= 0.1
F,
Note 2 unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Output Voltage
V
O
T
J
= +25
C
7.7
8.0
8.3
V
(Note 4)
1mA
I
O
70mA
7.6
8.4
V
1mA
I
O
70mA
7.6
8.4
V
V
MIN
V
IN
V
MAX
(7
V
IN
20)
Line Regulation
V
O
T
J
= +25
C
12
85
mV
(11
V
IN
23)
V
20
100
mV
(10.5
V
IN
23)
V
Load Regulation
V
O
T
J
= +25
C, 1mA
I
O
40mA
8
40
mV
T
J
= +25
C, 1mA
I
O
100mA
25
80
mV
Long Term Stability
V
O
20
1000Hrs
mV
Quiescent Current
I
Q
T
J
= +25
C
3
5
mA
T
J
= +125
C
4.7
mA
Quiescent Current Change
I
Q
1mA
I
O
40mA
0.1
mA
V
MIN
V
IN
V
MAX
1.0
mA
(11
V
IN
23)
V
Output Noise Voltage
V
n
T
J
= +25
C, Note 3, f = 10Hz to 10kHz
60
V
Ripple Rejection
V
IN
f = 120Hz
43
57
dB
V
OUT
IN
(12
V
IN
23)
V
Input Voltage Required to
Maintain Line Regulation
T
J
= +25
C
10.5
V
Note 2. The maximum steady state usable output current and input voltage are very dependent on
the heat sinking and/or lead length of the package. The data above represent pulse test
conditions with junction temperatures as indicated at the initiation of test.
Note 3. Recommended minimum load capacitance of 0.01
F to limit high frequency noise band-
width.
Note 4. The temperature coefficient of V
OUT
is typically within
0.01% V
O
/
C.
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