ALFA RPAR AS194H Matched NPN transistor pair (TO5-8)
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 base and emitter resistances is very low, giving very low noise and operating over a wide current range.
Also available in a SOIC package.
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.
We also have the more economical AS394H transistor pair with a bit less exact matching characteristics.
| Parameter | AS194* | AS394 | ||||
|---|---|---|---|---|---|---|
| Min | Typ | Max | Min | Typ | Max | |
| Current Gain @ Ic=1mA @ Ic=100µA @ Ic=10µA @ Ic=1µA | 350 350 300 | 700 550 450 300 | 300 250 200 | 700 550 450 300 | ||
| Current Gain Match | 0.5% | 2% | 0.5% | 4% | ||
| Emitter-Base Offset Voltage | 25µV | 100µV | 150µV | |||
| Change in E-B Offset Voltage versus C-B Voltage | 10µV | 25µV | 10µV | 50µV | ||
| Change in E-B Offset Voltage versus Collector Current | 5µV | 25µV | 5µV | 50µV | ||
| Collector-Base Leakage | 0.05nA | 0.3nA | 0.05nA | 0.5nA | ||
See datasheet for full specifications.
Features
- Nearly ideal and identical transistors
- Common-mode rejection ratio > 120dB
- Emitter-base offset voltage < 100µV
- Emitter-base offset voltage temperature drift 0.1µV/°C
- Current gain matched < 2%
- Parameters are guaranteed in the range of collector current 10µA to 1mA
- Ideal logarithmic properties
Package: TO5-8
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(*) Products listed as "Compatible" have the same circuit functionality as this product. However they may have some variation in electrical characteristics - check datasheets to verify compatibility in your circuit design. Some may also have different physical packaging requiring adapters or PCB design changes.