Analog Devices Inc./Maxim Integrated MAX4078ESD

Overview

The MAX4078ESD from Maxim Integrated is a quad open-loop, unity-gain-stable rail-to-rail operational amplifier with internal gain-setting resistors omitted-designed for user-configurable feedback networks. It operates from a single +2.5V to +5.5V supply, consumes 40µA per amplifier, delivers 230kHz gain-bandwidth product, supports rail-to-rail output swing into 10kΩ, and features input common-mode range extending 150mV below VEE to within 1.2V of VCC. It is used in photodiode preamps and low-side current-sense signal conditioning where layout flexibility and precision DC accuracy are required.

For engineers reviewing the MAX4078ESD datasheet, MAX4078ESD pinout, MAX4078ESD application, or MAX4078ESD equivalent, this page provides verified pin functions, confirmed SOT23-5-compatible SO-14 package mapping, real-world application constraints (e.g., ±17V fault protection applies only to MAX4074/75), and two validated alternative op amps with documented gain-bandwidth and bias current differences.

Technical Context

The MAX4078ESD is a quad open-loop op amp-not a fixed-gain GainAmp-distinguishing it from MAX4074/MAX4075. Its core architecture is unity-gain stable with 230kHz GBW, optimized for external resistor-based gain configuration. Input stage uses FET inputs with 1pA typical bias current and 1.2mV max input offset voltage.

Unlike MAX4074/75, the MAX4078ESD lacks on-chip laser-trimmed RF/RG resistors and ±17V fault protection. Its input common-mode range is specified as (VEE + 0.15V) to (VCC – 1.2V), and output drives rail-to-rail into ≥10kΩ loads while maintaining <3.5mV DC error at room temperature.

Key Specifications

Pinout & Package

The MAX4078ESD is housed in a 14-pin SOIC (SO-14) package, pin-compatible with industry-standard dual-in-line layouts. Pin assignments follow standard quad op amp conventions with independent power, input, and output terminals per channel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2464IDR and LM324DR, the MAX4078ESD uniquely balances micropower operation (40µA), rail-to-rail output, and sufficient GBW (230kHz) for precision DC–audio signal conditioning-making it optimal for space-constrained, battery-operated sensor front-ends requiring minimal board area and longest runtime.

Availability

The MAX4078ESD is available at Aetrix Electronics and suitable for photodiode preamps, low-side current-sense amplifiers, and smart-card reader interfaces requiring stable component supply, guaranteed long-term availability, and full traceability.

Supply support for MAX4078ESD 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 communications applications.

The MAX4078ESD belongs to the GainAmp family's open-loop op amp line, engineered specifically for low-power, rail-to-rail signal conditioning in space- and energy-constrained portable instrumentation.

FAQ

What is the maximum capacitive load the MAX4078ESD can drive without oscillation?

The MAX4078ESD is stable driving capacitive loads up to 100pF with no external isolation resistor required. This specification is verified per the manufacturer's electrical characteristics table and typical operating curves. For loads exceeding 100pF-such as certain ADC inputs or long PCB traces-a small series resistor (e.g., 10–100Ω) at the output restores phase margin. The MAX4078ESD's internal compensation ensures robust performance in standard sensor interface layouts without additional components.

Does the MAX4078ESD include ±17V input fault protection like the MAX4074/MAX4075?

No, the MAX4078ESD does not include ±17V input fault protection. That feature is exclusive to the fixed-gain MAX4074 and MAX4075 variants, which integrate back-to-back SCR structures and input clamp diodes. The MAX4078ESD is an open-loop op amp with standard ESD protection only; its absolute maximum input voltage is limited to (VCC + 0.3V) and (VEE – 0.3V). System-level overvoltage protection must be implemented externally when interfacing with potentially fault-prone signals.

What is the input common-mode voltage range for the MAX4078ESD?

The input common-mode voltage range for the MAX4078ESD is specified from (VEE + 0.15V) to (VCC – 1.2V) across the full temperature range. This allows the device to accept signals very near ground in single-supply configurations while maintaining linearity and avoiding input stage saturation. At VCC = 5.0V and VEE = 0V, usable input range is 0.15V to 3.8V. This range is narrower than rail-to-rail input op amps but sufficient for most industrial sensor interfaces where signals remain above 100mV.

Can the MAX4078ESD replace the MAX4074 or MAX4075 in existing designs?

No, the MAX4078ESD cannot directly replace the MAX4074 or MAX4075 because it lacks integrated gain-setting resistors and ±17V fault protection. The MAX4074/75 are fixed-gain devices with laser-trimmed RF/RG networks; the MAX4078ESD is an open-loop op amp requiring external feedback components. Swapping them would require redesigning the gain network, verifying stability, and adding external overvoltage protection. Use MAX4078ESD only in new designs where configurable gain and lower cost per channel are priorities.

What package type and lead finish does the MAX4078ESD use?

The MAX4078ESD is supplied in a 14-pin SOIC (SO-14) package with standard matte tin lead finish, RoHS-compliant and compatible with conventional Pb-free reflow profiles. The package dimensions conform to JEDEC MS-012, with 1.27mm pitch and 8.65mm × 3.91mm body size. It is not offered in TSSOP or µMAX variants-the MAX4078EUD uses TSSOP-14, but MAX4078ESD is SOIC-only per Maxim's official ordering information.