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LM195/LM395 Ultra Reliable Power Transistors
July 2000
LM195/LM395
Ultra Reliable Power Transistors
General Description
The LM195/LM395 are fast, monolithic power integrated cir-
cuits with complete overload protection. These devices,
which act as high gain power transistors, have included on
the chip, current limiting, power limiting, and thermal over-
load protection making them virtually impossible to destroy
from any type of overload. In the standard TO-3 transistor
power package, the LM195 will deliver load currents in ex-
cess of 1.0A and can switch 40V in 500 ns.
The inclusion of thermal limiting, a feature not easily avail-
able in discrete designs, provides virtually absolute protec-
tion against overload. Excessive power dissipation or inad-
equate heat sinking causes the thermal limiting circuitry to
turn off the device preventing excessive heating.
The LM195 offers a significant increase in reliability as well
as simplifying power circuitry. In some applications, where
protection is unusually difficult, such as switching regulators,
lamp or solenoid drivers where normal power dissipation is
low, the LM195 is especially advantageous.
The LM195 is easy to use and only a few precautions need
be observed. Excessive collector to emitter voltage can de-
stroy the LM195 as with any power transistor. When the de-
vice is used as an emitter follower with low source imped-
ance, it is necessary to insert a 5.0k resistor in series with
the base lead to prevent possible emitter follower oscilla-
tions. Although the device is usually stable as an emitter fol-
lower, the resistor eliminates the possibility of trouble without
degrading performance. Finally, since it has good high fre-
quency response, supply bypassing is recommended.
For low-power applications (under 100 mA), refer to the
LP395 Ultra Reliable Power Transistor.
The LM195/LM395 are available in the standard TO-3, Kovar
TO-5, and TO-220 packages. The LM195 is rated for opera-
tion from −55˚C to +150˚C and the LM395 from 0˚C to
+125˚C.
Features
n
n
n
n
n
n
n
n
Internal thermal limiting
Greater than 1.0A output current
3.0 µA typical base current
500 ns switching time
2.0V saturation
Base can be driven up to 40V without damage
Directly interfaces with CMOS or TTL
100% electrical burn-in
Simplified Circuit
1.0 Amp Lamp Flasher
DS006009-16
DS006009-1
© 2000 National Semiconductor Corporation
DS006009
www.national.com
LM195/LM395
Connection Diagrams
TO-3 Metal Can Package
TO-220 Plastic Package
DS006009-3
Case is Emitter
DS006009-2
Bottom View
Order Number LM195K/883
See NS Package Number K02A
(Note 5)
Top View
Order Number LM395T
See NS Package Number T03B
TO-5 Metal Can Package
DS006009-4
Bottom View
Order Number LM195H/883
See NS Package Number H03B
(Note 5)
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2
LM195/LM395
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Collector to Emitter Voltage
LM195
LM395
Collector to Base Voltage
LM195
LM395
Base to Emitter Voltage (Forward)
LM195
LM395
42V
36V
42V
36V
42V
36V
Base to Emitter Voltage (Reverse)
Collector Current
Power Dissipation
Operating Temperature Range
LM195
LM395
Storage Temperature Range
Lead Temperature
(Soldering, 10 sec.)
20V
Internally Limited
Internally Limited
−55˚C to +150˚C
0˚C to +125˚C
−65˚C to +150˚C
260˚C
Preconditioning
100% Burn-In In Thermal Limit
Electrical Characteristics
(Note 2)
Parameter
Collector-Emitter Operating Voltage
(Note 4)
Base to Emitter Breakdown Voltage
Collector Current
TO-3, TO-220
TO-5
Saturation Voltage
Base Current
Quiescent Current (I
Q
)
Base to Emitter Voltage
Switching Time
Thermal Resistance Junction to
Case (Note 3)
V
CE
≤
15V
V
CE
≤
7.0V
I
C
≤
1.0A, T
A
= 25˚C
0
≤
I
C
≤
I
MAX
0
≤
V
CE
≤
V
CEMAX
V
be
= 0
0
≤
V
CE
≤
V
CEMAX
I
C
= 1.0A, T
A
= +25˚C
V
CE
= 36V, R
L
= 36Ω,
T
A
= 25˚C
TO-3 Package (K)
TO-5 Package (H)
TO-220 Package (T)
1.2
1.2
2.2
1.8
1.8
3.0
2.0
0.9
500
2.3
12
3.0
15
2.0
5.0
5.0
1.0
1.0
2.2
1.8
1.8
3.0
2.0
0.9
500
2.3
12
4
3.0
15
6
2.2
10
10
A
A
V
µA
mA
V
ns
˚C/W
˚C/W
˚C/W
0
≤
V
CE
≤
V
CEMAX
42
36
60
V
Conditions
Min
I
Q
≤
I
C
≤
I
MAX
LM195
Typ
Max
42
Min
LM395
Typ
Max
36
V
Units
Note 1:
“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2:
Unless otherwise specified, these specifications apply for −55˚C
≤
T
j
≤
+150˚C for the LM195 and 0˚C
≤
+125˚C for the LM395.
Note 3:
Without a heat sink, the thermal resistance of the TO-5 package is about +150˚C/W, while that of the TO-3 package is +35˚C/W.
Note 4:
Selected devices with higher breakdown available.
Note 5:
Refer to RETS195H and RETS195K drawings of military LM195H and LM195K versions for specifications.
3
www.national.com
LM195/LM395
Typical Performance Characteristics
Collector Characteristics
(for K and T Packages)
Bias Current
Short Circuit Current
DS006009-33
DS006009-34
DS006009-35
Quiescent Current
Base Emitter Voltage
Base Current
DS006009-36
DS006009-37
DS006009-38
Saturation Voltage
Response Time
Response Time
DS006009-39
DS006009-40
DS006009-41
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4
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