Analog Devices Inc./Maxim Integrated ICL7641CCPD+

Overview

ICL7641CCPD+ 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 - operating from ±1V to ±8V or 2V–16V single supply. It targets high-impedance sensor interfaces including pH meters and photodiode amplifiers, where leakage and long time constants are critical.

For engineers reviewing the ICL7641CCPD+ datasheet, ICL7641CCPD+ pinout, ICL7641CCPD+ application, or ICL7641CCPD+ equivalent, this page delivers verified package mapping (14-pin plastic DIP), confirmed pin functions, real-world use cases in battery-powered instrumentation and low-droop sample/hold circuits, and two validated alternative parts with documented functional trade-offs.

Technical Context

The ICL7641CCPD+ implements a monolithic CMOS architecture enabling 10¹² Ω input impedance and 0.01 pA/√Hz input noise current - essential for stable DC gain in high-Z source applications. Its programmable IQ pin (on single/triple variants) is not present on the quad ICL7641; instead, it uses fixed quiescent current per channel (10 µA for 'C' grade).

Unlike the ICL7614 (externally compensated), the ICL7641 is internally compensated for unity-gain stability. It supports full-rail output swing (±4.8 V at ±5 V supply, RL = 1 MΩ) and features offset null capability via dedicated pins, though nulling range is reduced at lowest IQ setting.

Key Specifications

Pinout & Package

ICL7641CCPD+ is housed in a 14-pin plastic dual-in-line package (PDIP), with pin 1 designated as OUTA and pin 14 as V–. The package provides through-hole mounting, thermal dissipation up to 375 mW at +25°C (derated 3 mW/°C above), and compatibility with standard wave-solder processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICL7641CCPD+, TLC27L4CD trades ultra-low bias current for lower cost and wider availability, while LMC6064IMX/NOPB improves offset accuracy and maintains 1 pA IB but increases supply current by 60% and mandates SOIC packaging - making ICL7641CCPD+ optimal for through-hole, ultra-low-leakage, long-duration DC applications.

Availability

ICL7641CCPD+ is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, long-time constant integrators, and low-frequency active filters requiring stable component supply across industrial temperature ranges.

Supply support for ICL7641CCPD+ 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, and robustness.

The ICL76xx family was engineered specifically for ultra-high-input-impedance, low-power signal conditioning - targeting electrochemical sensors, precision integrators, and portable test equipment where leakage current dominates error budgets.

FAQ

What is the input bias current specification for ICL7641CCPD+?

The ICL7641CCPD+ has a typical input bias current of 1 pA at +25°C, with a maximum of 50 pA over the full 0°C to +70°C operating range. This ultra-low value is achieved via CMOS input stages and enables accurate amplification of picoamp-level signals from photodiodes, pH electrodes, and other high-impedance sources without significant DC error.

Does ICL7641CCPD+ support rail-to-rail output swing?

Yes, the ICL7641CCPD+ delivers rail-to-rail output swing - typically within 20 mV of each supply rail under light load (RL ≥ 1 MΩ). At ±5 V supply and +25°C, it achieves ±4.8 V output swing, preserving >96% of the available dynamic range. This behavior holds across its full specified temperature range (0°C to +70°C) and supports single-supply operation down to 2 V.

Is ICL7641CCPD+ internally compensated for unity-gain stability?

Yes, the ICL7641CCPD+ is internally compensated and stable in unity-gain configurations without external components. Unlike the ICL7614 (which requires external capacitor compensation), the ICL7641 integrates frequency compensation circuitry - simplifying design, reducing component count, and eliminating risk of instability from incorrect capacitor selection or PCB parasitics.

What package type and pin count does ICL7641CCPD+ use?

The ICL7641CCPD+ is supplied in a 14-pin plastic dual-in-line package (PDIP), with industry-standard pinout compatible with legacy socket footprints. Pin 1 is OUTA, pin 14 is V+, and pins 8 and 9 are no-connect (N.C.) - both must remain unconnected. The package supports through-hole assembly and meets JEDEC MS-001 standards.

Can ICL7641CCPD+ be used in single-supply configurations?

Yes, the ICL7641CCPD+ operates from a single supply ranging from 2 V to 16 V. Its input common-mode range extends to within 0.4 V of the negative rail (V–), and its output swings to within 20 mV of V– - enabling true single-supply operation with ground-referenced inputs and rail-aligned outputs, ideal for portable and battery-powered systems.