The LM394 is junction isolated ultra well-matched monolithic NPN transistor pairs with an order of magnitude improvement in matching over conventional transistor pairs. Electrical characteristics of this device 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 1mA to 1mA and 0V up to 40V collector-base voltage, ensuring superior performance in nearly all applications.
To guarantee the 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.
LM394 Pinout
LM394 Pin Configuration
| Pin No | Description |
|---|---|
| 1 | Collector Pin Of Transistor Q1 |
| 2 | Base Pin Of Transistor Q1 |
| 3 | Emitter Pin Of Transistor Q1 |
| 4 | No Connection |
| 5 | No Connection |
| 6 | Emitter Pin Of Transistor Q2 |
| 7 | Base Pin Of Transistor Q2 |
| 8 | Collector Pin Of Transistor Q2 |
LM394 Features
- Emitter-base voltage matched to 50 mV
- Offset voltage drift less than 0.1 mV/§C
- Current gain matched to 2%
- Common-mode rejection ratio greater than 120 dB
- Parameters guaranteed over 1 mA to 1 mA collector current
- Extremely low noise
- Superior logging characteristics compared to conventional pairs
- Plug-in replacement for presently available devices
You can download this datasheet for LM394 Super match Pair – Datasheet from the link given below:
