NTE1908
Integrated Circuit
Positive 3 Terminal Voltage Regulator,
24V, 100mA
Description:
The NTE1908 voltage regulator is an inexpensive, easytouse device in a TO92 type package suitable
for a multitude of applications that require a regulated supply of up to 100mA. This device features internal
current limiting and thermal shutdown making the NTE1908 remarkably rugged. No external components
are required in many applications.
The NTE1908 offers a substantial performance advantage over the traditional zener dioderesistor
combination, as output impedance and quiescent current are substantially reduced.
Features:
D
Low Cost
D
5% Tolerance
D
Internal ShortCircuit Current Limiting
D
Internal Thermal Overload Protection
D
No External Components Required
D
Complementary to NTE1909 Negative Regulator
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Input Voltage, V
I
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Junction Temperature Range, T
J
0
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Junction Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (V
I
= 33V, I
O
= 40mA, C
I
= 0.33
F, C
O
= 0.1
F, 0
< T
J
< +125
C
unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Output Voltage
V
O
T
J
= +25
C
22.1
24.0
25.9
V
28V
V
I
38V, 1mA
I
O
40mA
21.6
26.4
V
28V
V
I
33V, 1mA
I
O
70mA
21.6
26.4
V
Line Regulation
Reg
line
T
J
= +25
C,
27.5V
V
I
38V
35
350
mV
I
O
= 40mA
28V
V
I
80V
30
300
mV
Electrical Characteristics (Cont'd): (V
I
= 33V, I
O
= 40mA, C
I
= 0.33
F, C
O
= 0.1
F,
0
< T
J
< +125
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Load Regulation
Reg
load
T
J
= +25
C
1mA
I
O
100mA
40
200
mV
1mA
I
O
40mA
20
100
mV
Input Bias Current
I
IB
T
J
= +25
C
3.1
6.5
mA
T
J
= +125
C
6.0
mA
Input Bias Current Change
I
IB
28V
V
I
38V
1.5
mA
1mA
I
O
40mA
0.2
mA
Output Noise Voltage
V
n
T
A
= +25
C, 10Hz
f
100kHz
200
V
LongTerm Stability
V
O
/
t
56
mV/1kHrs
Ripple Rejection
RR
I
O
= 40mA, f = 120Hz, 29V
V
I
35V,
T
J
= +25
C
30
43
dB
InputOutput Voltage
Differential
V
I
/V
O
T
J
= +25
C
1.7
V
V
OUT
GND
V
IN
.135 (3.45) Min
Seating Plane
.021 (.445) Dia Max
.210
(5.33)
Max
.500
(12.7)
Min
.050 (1.27)
.165 (4.2) Max
.105 (2.67) Max
.100 (2.54)
.105 (2.67) Max
.205 (5.2) Max
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