Features: `Internal thermal limiting
`Greater than 1.0A output current
`3.0 A 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-inSpecifications
| Temperature Min |
-55 deg C |
| Temperature Max |
150 deg C |
| Function |
Ultra Reliable Power Transistor |
| Channels |
1 Channels |
| View Using Catalog |
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....................................................................42V
LM395 ...................................................................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°CDescriptionThe 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 overload 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 excess of 1.0A and can switch 40V in 500 ns.
The inclusion of thermal limiting, a feature not easily available in discrete designs, provides virtually absolute protection against overload. Excessive power dissipation or inadequate 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 destroy the LM195 as with any power transistor. When the device is used as an emitter follower with low source impedance, it is necessary to insert a 5.0k resistor in series with the base lead to prevent possible emitter follower oscillations. Although the device is usually stable as an emitter follower, the resistor eliminates the possibility of trouble without 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 operation from -55°C to +150°C and the LM395 from 0°C to +125°C.
Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-110: Application Note 110 Fast IC Power Transistor with Thermal Protection |
333 Kbytes |
3-Oct-02 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
More Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-184: Application Note 184 References for A/D Converters |
64 Kbytes |
3-Oct-02 |
Download |
AN-184 (Japanese): Application Note 184 References for A/D Converters
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
124 Kbytes |
|
|
| AN-222: Application Note 222 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise |
399 Kbytes |
1-Oct-02 |
Download |
| AN-161: Application Note 161 IC Voltage Reference has 1ppm per Degree Drift |
138 Kbytes |
10-Oct-02 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
LM195 Data Sheet
