LM195,LM395
LM195/LM395 Ultra Reliable Power Transistors
Literature Number: SNOSBO4B
LM195/LM395
Ultra Reliable Power Transistors
General Description
The LM195/LM395 are fast, monolithic power integrated
circuits 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
device 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
follower, the resistor eliminates the possibility of trouble with-
out degrading performance. Finally, since it has good high
frequency 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
nInternal thermal limiting
nGreater than 1.0A output current
n3.0 µA typical base current
n500 ns switching time
n2.0V saturation
nBase can be driven up to 40V without damage
nDirectly interfaces with CMOS or TTL
n100% electrical burn-in
Simplified Circuit
00600901
1.0 Amp Lamp Flasher
00600916
July 2000
LM195/LM395 Ultra Reliable Power Transistors
© 2004 National Semiconductor Corporation DS006009 www.national.com
Connection Diagrams
TO-3 Metal Can Package
00600902
Bottom View
Order Number LM195K/883
See NS Package Number K02A
(Note 5)
TO-220 Plastic Package
00600903
Case is Emitter
Top View
Order Number LM395T
See NS Package Number T03B
TO-5 Metal Can Package
00600904
Bottom View
Order Number LM195H/883
See NS Package Number H03B
(Note 5)
LM195/LM395
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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 42V
LM395 36V
Collector to Base Voltage
LM195 42V
LM395 36V
Base to Emitter Voltage (Forward)
LM195
LM395
42V
36V
Base to Emitter Voltage (Reverse) 20V
Collector Current Internally Limited
Power Dissipation Internally Limited
Operating Temperature Range
LM195 −55˚C to +150˚C
LM395 0˚C to +125˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature
(Soldering, 10 sec.) 260˚C
Preconditioning
100% Burn-In In Thermal Limit
Electrical Characteristics
(Note 2)
Parameter Conditions LM195 LM395 Units
Min Typ Max Min Typ Max
Collector-Emitter Operating Voltage I
Q
≤I
C
≤I
MAX
42 36 V
(Note 4)
Base to Emitter Breakdown Voltage 0 ≤V
CE
≤V
CEMAX
42 36 60 V
Collector Current
TO-3, TO-220 V
CE
≤15V 1.2 2.2 1.0 2.2 A
TO-5 V
CE
≤7.0V 1.2 1.8 1.0 1.8 A
Saturation Voltage I
C
≤1.0A, T
A
= 25˚C 1.8 2.0 1.8 2.2 V
Base Current 0 ≤I
C
≤I
MAX
3.0 5.0 3.0 10 µA
0≤V
CE
≤V
CEMAX
Quiescent Current (I
Q
)V
be
=0 2.0 5.0 2.0 10 mA
0≤V
CE
≤V
CEMAX
Base to Emitter Voltage I
C
= 1.0A, T
A
= +25˚C 0.9 0.9 V
Switching Time V
CE
= 36V, R
L
=36Ω,500 500 ns
T
A
= 25˚C
Thermal Resistance Junction to TO-3 Package (K) 2.3 3.0 2.3 3.0 ˚C/W
Case (Note 3) TO-5 Package (H) 12 15 12 15 ˚C/W
TO-220 Package (T) 4 6 ˚C/W
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 ≤Tj≤+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.
LM195/LM395
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Typical Performance Characteristics
(for K and T Packages)
Collector Characteristics Short Circuit Current
00600933 00600934
Bias Current Quiescent Current
00600935 00600936
Base Emitter Voltage Base Current
00600937 00600938
LM195/LM395
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Typical Performance Characteristics (for K and T Packages) (Continued)
Saturation Voltage Response Time
00600939 00600940
Response Time 10V Transfer Function
00600941
00600907
36V Transfer Function Transconductance
00600908 00600909
LM195/LM395
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Typical Performance Characteristics (for K and T Packages) (Continued)
Small Signal Frequency
Response
00600910
Schematic Diagram
00600911
LM195/LM395
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Typical Applications
1.0 Amp Voltage Follower
00600912
*Solid Tantalum
Power PNP Time Delay
00600913
*Protects against excessive base drive
**Needed for stability 00600914
1.0 MHz Oscillator
00600915
LM195/LM395
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Typical Applications (Continued)
1.0 Amp Negative Regulator
00600917
†Solid Tantalum
1.0 Amp Positive Voltage Regulator
00600918
†Solid Tantalum
LM195/LM395
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Typical Applications (Continued)
Fast Optically Isolated Switch Optically Isolated Power Transistor
00600919 00600920
CMOS or TTL Lamp Interface Two Terminal Current Limiter
00600921
00600922
40V Switch
00600923
*Drive Voltage 0V to ≥10V ≤42V
6.0V Shunt Regulator with Crowbar Two Terminal 100 mA Current Regulator
00600924
00600925
LM195/LM395
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Typical Applications (Continued)
Low Level Power Switch Power One-Shot
00600926
Turn ON = 350 mV
Turn OFF = 200 mV
00600927
T = R1C
R2 = 3R1
R2 ≤82k
Emitter Follower High Input Impedance AC Emitter Follower
00600928
*Need for Stability 00600929
Fast Follower
00600930
*Prevents storage with fast fall time square wave drive
LM195/LM395
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Typical Applications (Continued)
Power Op Amp
00600931
*Adjust for 50 mA quiescent current
†Solid Tantalum
6.0 Amp Variable Output Switching Regulator
00600932
*Sixty turns wound on Arnold Type A-083081-2 core.
**Four devices in parallel
†Solid tantalum
LM195/LM395
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Physical Dimensions inches (millimeters) unless otherwise noted
TO-5 Metal Can Package
Order Number LM195H/883
NS Package Number H03B
TO-3 Metal Can Package
Order Number LM195K/883
NS Package Number K02A
LM195/LM395
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-220 Plastic Package
Order Number LM395T
NS Package Number T03B
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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LM195/LM395 Ultra Reliable Power Transistors
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