Analog Devices Inc./Maxim Integrated MAX400CPA

Overview

MAX400CPA from Maxim Integrated is an ultra-low offset voltage operational amplifier in 8-pin plastic DIP package, featuring guaranteed maximum 10µV input offset voltage, 0.3µV/°C max offset drift, and ±3V to ±18V wide supply range. It serves as a precision DC-coupled gain stage in thermocouple amplifiers and strain gauge signal chains where long-term stability and minimal drift are critical.

For engineers reviewing the MAX400CPA datasheet, MAX400CPA pinout, MAX400CPA application, or MAX400CPA equivalent, key selection criteria include its 0.2µV/month long-term offset stability, 0.35µV_P-P (0.1–10Hz) input noise, ±14V common-mode input range, and socket compatibility with OP07, AD510, and 725 devices.

Technical Context

The MAX400CPA implements a precision bipolar input stage optimized for minimal input offset and drift, with internal trimming circuitry accessed via two dedicated V_OS TRIM pins. Its architecture avoids chopper stabilization, distinguishing it from the MAX420/MAX430 series while delivering superior DC performance versus non-chopper op-amps like the OP07.

It operates across 0°C to +70°C ambient temperature, supports rail-to-rail output swing up to ±12.8V into 2kΩ, and maintains 114dB CMRR at ±13V common-mode voltage - enabling high-accuracy differential measurements in noisy industrial environments without external filtering or calibration.

Key Specifications

Pinout & Package

MAX400CPA is housed in an 8-pin plastic dual in-line package (PDIP), with through-hole mounting and industry-standard footprint compatible with OP07 sockets.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision operational amplifier applications.

Compared with OP07EP and AD8628ARZ, the MAX400CPA delivers optimal balance of ultra-low drift, zero external components, and proven reliability in legacy industrial instrumentation - making it the preferred choice where chopper noise is unacceptable and long-term calibration stability is mandatory.

Availability

MAX400CPA is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge signal conditioning, and medical instrumentation requiring stable component supply and long-term calibration integrity.

Supply support for MAX400CPA 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.

The MAX400 series was developed specifically for ultra-precision DC signal conditioning applications where chopper-stabilized noise or complexity is undesirable - targeting legacy instrumentation upgrades and metrology-grade sensor interfaces.

FAQ

What is the maximum guaranteed input offset voltage for MAX400CPA?

The MAX400CPA has a guaranteed maximum input offset voltage of 10 µV at +25°C, measured one minute after power application. Over the full 0°C to +70°C operating temperature range, the maximum offset rises to 40 µV. This specification is 100% tested and applies specifically to the MAX400CPA variant in plastic DIP packaging, not extrapolated from other MAX400 variants.

Does MAX400CPA require external components for basic operation?

No, the MAX400CPA operates without external compensation or bias components. Its internal design eliminates the need for frequency compensation capacitors or input bias current cancellation networks. However, optional external 20kΩ potentiometers connected between Pins 1 and 5 enable precise offset nulling - a feature retained from its OP07-compatible socket design but not required for functional operation.

Is MAX400CPA pin-compatible with OP07 op-amps?

Yes, the MAX400CPA uses the same 8-pin DIP footprint and pin configuration as the OP07, including identical placement of V+, V−, +IN, −IN, V_OUT, and two V_OS TRIM pins. The Pin 8 N.C. designation matches OP07's unused pin. This mechanical and electrical compatibility enables direct socket replacement in existing OP07-based circuits without PCB modification.

What is the long-term input offset voltage stability of MAX400CPA?

The MAX400CPA guarantees 0.2 µV/month long-term input offset voltage stability after the first 30 days of operation. This specification reflects the average trend line of offset drift over extended periods and is distinct from short-term thermal effects. It is validated across the MAX400CPA's 0°C to +70°C operating range and forms the basis for extended calibration intervals in certified measurement equipment.

Can MAX400CPA operate from ±3V supplies?

Yes, the MAX400CPA supports supply voltages from ±3V to ±18V. At ±3V, it delivers 4–6 mW power consumption and maintains full functionality including 150 V/mV large-signal voltage gain and ±10.5V output swing into 1kΩ. This low-voltage capability enables use in battery-powered portable instruments while retaining its ultra-low offset and drift specifications.