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Part: LM395H
Category:
Discrete
-> Transistors
Description: LM395 - Ultra Reliable Power Transistor, Package: to 220, Pin Nb=3
Company: National Semiconductor Corporation
Datasheet: Download LM395H datasheet File size : 4 kB
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Datasheet text preview:
LM195/LM395 Ultra Reliable Power Transistors
July 2000
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 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.
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
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© 2000 National Semiconductor Corporation
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LM195/LM395
Connection Diagrams
TO-3 Metal Can Package TO-220 Plastic Package
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Case is Emitter
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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
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Bottom View Order Number LM195H/883 See NS Package Number H03B (Note 5)
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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 (IQ) Base to Emitter Voltage Switching Time Thermal Resistance Junction to Case (Note 3) VCE 15V VCE 7.0V IC 1.0A, TA = 25°C 0 IC IMAX 0 VCE VCEMAX Vbe = 0 0 VCE VCEMAX IC = 1.0A, TA = +25°C VCE = 36V, RL = 36, TA = 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 VCE VCEMAX 42 36 60 V Conditions Min IQ IC IMAX 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 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.
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LM195/LM395
Typical Performance Characteristics
Collector Characteristics
(for K and T Packages) Bias Current
Short Circuit Current
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Quiescent Current
Base Emitter Voltage
Base Current
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Saturation Voltage
Response Time
Response Time
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LM195/LM395
Typical Performance Characteristics
10V Transfer Function
(for K and T Packages) (Continued) 36V Transfer Function
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Transconductance
Small Signal Frequency Response
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