TL061CDT

## Overview

The STMicroelectronics TL061CDT is a high-performance JFET-input operational amplifier designed for low-noise, high-speed, and precision applications. It features low input bias current, wide bandwidth, and low offset voltage, making it suitable for signal conditioning, active filtering, data acquisition, and instrumentation circuits. Its JFET input stage provides high input impedance and low input current, enabling accurate performance in high-impedance sensor interfaces.

## Functional Description

The TL061CDT integrates a bipolar JFET input stage with a high-gain amplifier structure:

* Low input bias current (typical 30 pA) for minimal loading on high-impedance sources
* High input impedance (>10^12 Ω) due to JFET input stage
* Internal compensation for stable operation in unity-gain configurations
* Wide common-mode input voltage range including negative rail
* Rail-to-rail output swing capability in single-supply configurations

This combination ensures high fidelity signal amplification with minimal distortion and accurate voltage tracking.

## Electrical Characteristics

Key electrical specifications include:

* Supply voltage (VCC): ±3 V to ±18 V or single supply 6 V to 36 V
* Input offset voltage (VOS): 3 mV typical, 10 mV maximum
* Input bias current (IB): 30 pA typical
* Input offset current (IOS): 5 pA typical
* Common-mode rejection ratio (CMRR): 80 dB typical
* Power supply rejection ratio (PSRR): 80 dB typical
* Open-loop voltage gain (AOL): 120 dB typical
* Slew rate: 13 V/μs typical
* Gain-bandwidth product: 3 MHz typical
* Supply current (per amplifier): 1.4 mA typical

These parameters make the TL061CDT suitable for precision analog signal processing, even in low-power applications.

## Input and Output Features

* Input voltage range extends from V- + 2 V to V+ - 2 V for linear operation
* Input stage uses JFET transistors to minimize current-induced voltage errors
* Output swing typically 0.5 V from the rails under load conditions
* Capable of driving moderate capacitive loads without oscillation
* Low noise density: 18 nV/√Hz at 1 kHz

The high-impedance input and low noise characteristics make it ideal for sensor interfacing and low-level analog signals.

## Thermal and Environmental Characteristics

* Operating temperature range: -40°C to +125°C
* Storage temperature range: -65°C to +150°C
* Thermal resistance, junction-to-ambient (θJA): 100°C/W typical in DIP-8 configuration
* Power dissipation: 500 mW maximum per amplifier under continuous operation

The device is robust enough for industrial and automotive applications, providing stable performance over wide temperature ranges.

## Package Information

* Available in 8-lead DIP and SOIC packages
* TL061CDT is specifically the DIP-8 (CDT) package
* Lead-free and RoHS-compliant
* Standard pin configuration compatible with most general-purpose op-amp applications
* Compact package suitable for prototyping and legacy systems

The DIP package facilitates breadboard and PCB implementation while supporting reliable soldering and handling.

## Applications

* Precision instrumentation and measurement systems
* Active filtering and signal conditioning
* Sensor interface amplifiers for high-impedance sensors
* Audio preamplifiers and low-noise signal processing
* Data acquisition systems requiring high input impedance and low offset

The combination of JFET input, low offset, and high input impedance allows the TL061CDT to operate effectively in demanding analog signal environments.

## Key Features and Advantages

* JFET-input operational amplifier with low input bias current (30 pA typical)
* High open-loop gain: 120 dB typical
* Wide common-mode input voltage range and near-rail output swing
* Gain-bandwidth product of 3 MHz for moderate-speed applications
* Low input offset voltage and low input offset current for precision applications
* Wide supply voltage range (±3 V to ±18 V or 6 V to 36 V single-supply)
* Robust DIP-8 package suitable for industrial and laboratory use

The TL061CDT provides a precise, low-noise, and high-input-impedance solution for a wide range of analog signal processing and measurement applications, combining accuracy, stability, and ease of integration.