Features: · Emitter-base voltage matched to 50 mV
· Offset voltage drift less than 0.1 mV/§C
· Current gain (hFE) matched to 2%
· Common-mode rejection ratio greater than 120 dB
· Parameters guaranteed over 1 mA to 1 mA collector current
· Extremel· low noise
· Superior logging characteristics compared to conventional pairs
· Plug-in replacement for presentl· available devicesSpecifications
| Channels |
2 Channels |
| Collector-Emitter Voltage Rating |
35, 20 Volt |
| Temperature Min |
-25 deg C |
| Temperature Max |
85 deg C |
| View Using Catalog |
Collector Current .............. 20 mA
Collector-Emitter Voltage ..........VMAX
Collector-Emitter Voltage .......... 35V
LM394C .................... 20V
Collector-Base Voltage............ 35V
LM394C.................... 20V
Collector-Substrate Voltage ........ 35V
LM394C .................... 20V
Collector-Collector Voltage ......... 35V
LM394C .................. 20V
Base-Emitter Current .........±10 mA
Power Dissipation............500 mW
Junction Temperature
LM194 .............. -55 to +125
LM394/LM394B/LM394C .... -25 to a85
Storage Temperature Range .-65 to +150
Soldering Information
Metal Can Package (10 sec.) ...... 260
Dual-In-Line Package (10 sec.) ..... 260
Small Outline Package
Vapor Phase (60 sec.) ........... 215
Infrared (15 sec.) .............. 220DescriptionThe LM194 and LM394 are junction isolated ultra well-matched monolithic NPN transistor pairs with an order of magnitude improvement in matching over conventional transistor pairs. This was accomplished by advanced linear processing and a unique new device structure.
Electrical characteristics of these devices such as drift versus initial offset voltage, noise, and the exponential relationship of base-emitter voltage to collector current closely approach those of a theoretical transistor. Extrinsic emitter and base resistances are much lower than presently available pairs, either monolithic or discrete, giving extremely low noise and theoretical operation over a wide current range. Most parameters are guaranteed over a current range of 1 µA to 1 mA and 0V up to 40V collector-base voltage, ensuring superior performance in nearly all applications.
To guarantee long term stability of matching parameters, internal clamp diodes have been added across the emitter-base junction of each transistor. These prevent degradation due to reverse biased emitter current-the most common cause of field failures in matched devices. The parasitic isolation junction formed by the diodes also clamps the substrate region to the most negative emitter to ensure complete isolation between devices.
The LM194 and LM394 will provide a considerable improvement in performance in most applications requiring a closely matched transistor pair. In many cases, trimming can be eliminated entirely, improving reliability and decreasing costs. Additionally, the low noise and high gain make this device attractive even where matching is not critical.
The LM194 and LM394/LM394B/LM394C are available in an isolated header 6-lead TO-5 metal can package. The LM394/LM394B/LM394C are available in an 8-pin plastic dual-in-line package. The LM194 is identical to the LM394 except for tighter electrical specifications and wider temperature range.
Design Tools
| Title |
Size in Kbytes |
Date |
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| Amplifiers Selection Guide software for Windows |
8 Kbytes |
6-Mar-2007 |
View |
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If you have trouble printing or viewing PDF file(s), see Printing Problems.
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Application Notes
| Title |
Size in Kbytes |
Date |
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| AN-299: Application Note 299 Audio Applications of Linear Integrated Circuits |
232 Kbytes |
24-Feb-99 |
Download |
| AN-222: Application Note 222 Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise |
399 Kbytes |
1-Oct-02 |
Download |
| AN-311: Application Note 311 Theory and Applications of Logarithmic Amplifiers |
258 Kbytes |
2-Oct-02 |
Download |
| AN-31: Application Note 31 Op Amp Circuit Collection |
962 Kbytes |
2-Oct-02 |
Download |
| AN-265: Application Note 265 An Electronic Watt-Watt-Hour Meter |
185 Kbytes |
3-Oct-02 |
Download |
| AN-293: Application Note 293 Control Applications of CMOS DACs |
385 Kbytes |
4-Oct-04 |
Download |
| AN-263: Application Note 263 Sine Wave Generation Techniques |
350 Kbytes |
26-May-09 |
Download |
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|
More Application Notes
| Title |
Size in Kbytes |
Date |
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| 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 |
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| AN-173: Application Note 173 IC Zener Eases Reference Design |
54 Kbytes |
1-Oct-02 |
Download |
| AN-460: Application Note 460 LM34/LM35 Precision Monolithic Temperature Sensors |
306 Kbytes |
20-Sep-02 |
Download |
AN-460 (Japanese): Application Note 460 LM34/LM35 Precision Monolithic Temperature Sensors
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
322 Kbytes |
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| AN-286: Application Note 286 Applications of the LM392 Comparator Op Amp IC |
135 Kbytes |
2-Oct-02 |
Download |
| AN-262: Application Note 262 Applying Dual and Quad FET Op Amps |
416 Kbytes |
2-Oct-02 |
Download |
| AN-161: Application Note 161 IC Voltage Reference has 1ppm per Degree Drift |
138 Kbytes |
10-Oct-02 |
Download |
| AN-181: Application Note 181 3-Terminal Regulator Is Adjustable |
165 Kbytes |
1-May-04 |
Download |
| AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment |
162 Kbytes |
1-Oct-02 |
Download |
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
215 Kbytes |
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| AN-274: Application Note 274 CMOS A/D Converter Interfaces Easily with Many Microprocessors |
73 Kbytes |
3-Oct-02 |
Download |
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|
LM394 Data Sheet
