Analog Devices Inc./Maxim Integrated MAX412CSA+T

Overview

MAX412CSA+T from Maxim Integrated is a dual, precision, low-noise operational amplifier optimized for high-speed, low-voltage systems. It delivers 2.4nV/√Hz input voltage-noise density at 1kHz, 28MHz unity-gain bandwidth, and 4.5V/µs slew rate while operating from ±2.4V to ±5V supplies and consuming only 2.5mA per amplifier. It is used in ultra-low-noise instrumentation amplifiers and infrared detector front-ends.

For engineers reviewing the MAX412CSA+T datasheet, MAX412CSA+T pinout, MAX412CSA+T application, or MAX412CSA+T equivalent, key selection criteria include its guaranteed 2.4nV/√Hz noise floor at 1kHz, ±250µV max input offset voltage (0°C to +70°C), SO-8 package compatibility, and stability driving up to 3900pF capacitive loads in unity-gain configuration.

Technical Context

The MAX412CSA+T employs a bipolar input stage designed to minimize voltage noise without compromising DC accuracy or AC stability. Its architecture achieves low noise via high collector currents while maintaining tight control over input bias current (±80nA typ) and offset voltage drift (±1µV/°C).

It supports rail-to-rail output swing of ±3.6V into 2kΩ from ±5V supplies and remains unity-gain stable with capacitive loads up to 3900pF - a critical feature for sensor signal conditioning and high-fidelity audio buffering where phase margin must be preserved.

Key Specifications

Pinout & Package

MAX412CSA+T is housed in an 8-pin SO (Small Outline) package with standard dual op-amp pinout compatible with industry-wide PCB footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-noise op amp applications.

Compared with OPA211AIDR and ADA4898-2ARMZ, the MAX412CSA+T offers best-in-class trade-off between noise (2.4nV/√Hz), stability (unity-gain stable to 3900pF), and supply efficiency (2.5mA/amplifier) for precision DC-coupled sensor interfaces operating below 10MHz.

Availability

MAX412CSA+T is available at Aetrix Electronics and suitable for low-noise instrumentation amplifiers, infrared detector front-ends, and high-quality audio preamplifiers requiring stable component supply across industrial temperature ranges.

Supply support for MAX412CSA+T 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 demanding industrial, medical, and communications applications.

The MAX410/MAX412/MAX414 family was engineered specifically for low-noise, low-voltage signal conditioning in measurement systems where voltage noise, offset stability, and capacitive-load drive capability are critical.

FAQ

What is the maximum capacitive load the MAX412CSA+T can drive while remaining unity-gain stable?

The MAX412CSA+T remains unity-gain stable when driving capacitive loads up to 3900pF, as verified in the Typical Operating Characteristics section of the datasheet. This capability eliminates the need for external compensation in many sensor buffer and probe amplifier applications. For loads exceeding 3900pF, an isolation resistor (e.g., 10Ω) must be added in series with the output. The MAX412CSA+T's robust phase margin ensures reliable operation in high-impedance measurement setups without oscillation risk.

Does the MAX412CSA+T require external offset nulling components?

No, the MAX412CSA+T does not include dedicated offset null pins and is not designed for external trimming. Its input offset voltage is specified at ±250µV maximum over 0°C to +70°C, and its ±1µV/°C tempco ensures minimal drift across temperature. For applications requiring sub-100µV offset, system-level calibration or post-processing is recommended instead of hardware nulling. The MAX412CSA+T's internal laser-trimmed design provides sufficient DC accuracy for most precision instrumentation uses without external components.

Can the MAX412CSA+T operate from a single 5V supply?

Yes, the MAX412CSA+T supports single-supply operation down to 4.8V total supply (e.g., V+ = 4.8V, V− = 0V). Its input common-mode range extends to within 1.5V of each rail, and output swing reaches within 1.4V of V+ and 1.3V of V− into 2kΩ. When operated from 5V, it delivers usable output swing from ~1.3V to ~3.7V. However, bipolar supply operation (e.g., ±2.4V) is preferred for symmetric signal handling and optimal noise performance, as confirmed in the Electrical Characteristics tables.

What is the guaranteed input voltage-noise density specification for the MAX412CSA+T?

The MAX412CSA+T guarantees input voltage-noise density ≤2.4nV/√Hz at 1kHz, as stated in the Features section and confirmed in the Electrical Characteristics table under "Input Noise-Voltage Density" for the MAX412/MAX412B grade. This value is measured at TA = +25°C with ±5V supplies and applies across the full 0°C to +70°C operating range. The typical value is 1.5nV/√Hz, and the 1/f corner frequency is 90Hz - making it especially effective for broadband noise-critical applications like lock-in amplifiers and low-frequency spectroscopy.

Is the MAX412CSA+T pin-compatible with other dual op amps in SO-8 packages?

Yes, the MAX412CSA+T uses the industry-standard dual op-amp pinout for SO-8 packages: Pin 1 = OUT1, Pin 2 = IN1−, Pin 3 = IN1+, Pin 4 = V−, Pin 5 = IN2+, Pin 6 = IN2−, Pin 7 = OUT2, Pin 8 = V+. This matches the pin configuration of LM358, TL072, AD822, and OP27 variants in SO-8. However, electrical behavior differs significantly - particularly in noise, bandwidth, and supply current - so functional substitution requires validation of signal chain requirements. The MAX412CSA+T is not a drop-in replacement for general-purpose op amps without circuit review.