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NTE945

Integrated Circuit Operational Amp

NTE Electronics 

NTE945

Integrated Circuit

Operational Amp

Description:

The NTE945 is a precision, high input impedance operational amplifier in an 8−Lead Metal Can type

package designed for applications requiring extremely low input current errors. This device uses su-

pergain transistors in a Darlington input stage to get input bias currents that are equal to high−quality

FET amplifiers−even in limited temperature range operation.

Unlike most other internally compensated amplifiers, the MOS compensation capacitor is protected

to prevent catastrophic failure from overvoltage spikes on the supplies.

The low current error of this amplifier makes possible many designs that were previously impractical

with monolithic amplifiers. It will operate from 100mΩ source resistances, introducing less error than

general purpose amplifiers with 10kΩ sources, Integrators with worst case drifts less than 10µV/sec

and analog time delays in excess of one day can also be made using capacitors no larger than 1µF.

Features:

D Guaranteed Bias Currents as Low as 50pA

D Maximum Offset Currents Down to 15pA

D Operates from Supplies of ±3V to ±20V

D Supply Current Only 300µA at ±20V

Absolute Maximum Ratings:

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20V

Power Dissipation (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW

Differential Input Current (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10mA

Input Voltage (Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±15V

Output Short−Circuit Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite

Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C

Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C

Lead Temperature (Durin Soldering, 10sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C

Note 1. The maximum junction temperature is +70°C. For operating at elevated temperatures, the

NTE945 must be derated based on a thermal resistance of +150°C/W, junction−to−ambient,

or +45°C/W, junction−to−case.

Note 2. The inputs are shunted with back−to−back diodes for overvoltage protection. Therefore, ex-

cessive current will flow if a differential input voltage in excess of 1V is applied between the

inputs unless some limiting resistance is used.

Note 3. For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply

voltage.

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