Analog Devices Inc./Maxim Integrated ICL7642ECPD

Overview

ICL7642ECPD from Maxim Integrated is a quad CMOS operational amplifier optimized for ultra-low input bias current (1 pA typical), programmable quiescent current (10/100/1000 µA per amplifier), and rail-to-rail output swing within millivolts of supply rails. It operates from ±1V to ±8V dual supplies or 2V–16V single supplies, supporting battery-powered pH meters, picoammeters, and low-droop sample/hold amplifiers.

For engineers reviewing the ICL7642ECPD datasheet, ICL7642ECPD pinout, ICL7642ECPD application, or ICL7642ECPD equivalent, key selection criteria include confirmed 1 pA input bias current at +25°C, 14-pin plastic DIP package with industry-standard pinout, ±4.8 V output swing (RL = 1 MΩ, TA ≤ +70°C), and verified compatibility with high-impedance sensor front-ends requiring long time constants.

Technical Context

The ICL7642ECPD implements monolithic CMOS architecture with pin-selectable quiescent current via external voltage applied to the IOSET terminal-enabling trade-offs between bandwidth (0.044 MHz at 10 µA, up to 1.4 MHz at 1 mA) and power consumption. Its input stage features 10¹² Ω input impedance and 0.01 pA/√Hz noise current, enabling direct interfacing with photodiodes and ion-selective electrodes without guard rings or leakage compensation.

Unlike fixed-IQ duals (e.g., ICL7622), the ICL7642 supports independent IQ configuration per amplifier channel via dedicated IOSET pins (pins 1, 5, 9, 13). Output stages are designed for symmetrical sourcing/sinking capability, with output swing degradation limited to ±4.0 V at 1 mA IQ and RL = 10 kΩ across –40°C to +85°C.

Key Specifications

Pinout & Package

ICL7642ECPD uses a 14-pin plastic DIP (PD) package with 0.3-inch width, compliant with JEDEC MS-001. Pin 7 is internally connected to V–, and pin 14 is V+.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad CMOS op amp applications.

Compared with TLC27L4CDR and LMC6084IMX/NOPB, the ICL7642ECPD uniquely supports per-amplifier quiescent current selection and dedicated offset nulling-critical for optimizing power vs. precision in multi-channel sensor systems where individual amplifiers serve distinct signal conditioning roles.

Availability

ICL7642ECPD is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time constant integrators requiring stable component supply across extended production lifecycles.

Supply support for ICL7642ECPD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and automotive applications, emphasizing low-power, high-accuracy performance.

The ICL7642ECPD belongs to the ICL761X–ICL764X family of ultra-low-input-current CMOS op amps, engineered specifically for high-impedance sensor interfacing, electrochemical measurement, and energy-constrained portable instrumentation.

FAQ

What is the maximum operating temperature range for the ICL7642ECPD?

The ICL7642ECPD is rated for –40°C to +85°C (E grade), validated across this full industrial temperature range with guaranteed parameters including ±4.7 V output swing (RL = 1 MΩ) and 1 pA input bias current at +25°C. Derating applies above +25°C per 3 mW/°C power dissipation limit in the 14-pin plastic DIP package.

How does the IOSET pin configure quiescent current in the ICL7642ECPD?

Each IOSET pin (pins 1, 5, 9, 13) sets quiescent current independently: connect to V+ for 10 µA, to V– + 0.8 V to V+ – 0.8 V for 100 µA, or to V– for 1000 µA. This per-amplifier control allows mixing IQ settings across the quad-e.g., 10 µA for precision sensing and 1000 µA for fast output buffering-within a single ICL7642ECPD device.

Can the ICL7642ECPD be used in single-supply configurations?

Yes, the ICL7642ECPD operates from 2 V to 16 V single supplies. Its common-mode input range extends to –0.4 V (relative to V–) and +0.6 V (relative to V+), allowing input signals near ground when V– = 0 V. Output swing reaches within 20 mV of both rails, enabling full-scale signal capture in 3.3 V or 5 V systems without level-shifting circuitry.

Does the ICL7642ECPD require external frequency compensation?

No, the ICL7642ECPD is internally compensated for unity-gain stability across all IQ settings and supply voltages. Unlike the ICL7614 (externally compensated), it requires no external capacitor and maintains phase margin >45° at 10 µA IQ. This simplifies layout and eliminates compensation-related instability risks in multi-channel designs.

What is the purpose of the OFFSET pins on the ICL7642ECPD?

The ICL7642ECPD provides dedicated OFFSET pins (pins 8, 11, 14 unused; pin 8 for Amp A, pin 11 for Amp C) to null input offset voltage. Connect a 25 kΩ potentiometer between OFFSET pins with wiper to V+; adjustment range covers ±10 mV VOS at 100 µA/1 mA IQ. At 10 µA IQ, nulling may be insufficient for >5 mV VOS variants like ICL7642DCPD.