Qty 3 of ALFA RPAR AS194H Ultra-matched NPN transistor pair (TO5-8) - LM194 equ

Description

AS194 LM194 194 matched pair transistor npn
ALFA RPAR AS194H Matched NPN Transistor Pair (TO5-8)
The ALFA RPAR AS194 is a junction isolated ultra well-matched monolithic NPN transistor pair with an order of magnitude improvement in matching over conventional transistor pairs.
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.
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
*This device
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
References
ALFA RPAR AS194H Data Sheet
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