Analog Devices Inc./Maxim Integrated MAX4078EUD

Overview

The MAX4078EUD from Maxim Integrated is a quad open-loop, unity-gain-stable rail-to-rail operational amplifier with 230kHz gain-bandwidth product, 34µA supply current per amplifier, and input common-mode range extending from 150mV below VEE to within 1.2V of VCC. It operates from a single +2.5V to +5.5V supply and drives capacitive loads up to 100pF without isolation resistors-ideal for low-power sensor signal conditioning in space-constrained portable instrumentation.

For engineers reviewing the MAX4078EUD datasheet, MAX4078EUD pinout, MAX4078EUD application, or MAX4078EUD equivalent, key selection criteria include its quad-channel SOT23-compatible TSSOP-14 package, ±17V fault-protected inputs (MAX4074/75 only-not applicable), rail-to-rail output swing into 1kΩ, and guaranteed stability with 100pF capacitive loads-critical for photodiode preamp and smart-card reader front-end designs.

Technical Context

The MAX4078EUD implements four independent, unity-gain-stable op amp cores optimized for micropower operation. Each amplifier features rail-to-rail outputs capable of driving 1kΩ while maintaining DC accuracy, and an input common-mode voltage range of (VEE − 0.15V) to (VCC − 1.2V). Its 230kHz −3dB bandwidth and 200pA max input bias current support precision DC-coupled amplification.

Unlike the fixed-gain MAX4074/MAX4075 variants, the MAX4078EUD provides open-loop configuration flexibility-enabling user-defined gain via external feedback networks. It is not internally trimmed for fixed gain, lacks integrated gain-setting resistors, and does not feature ±17V input fault protection (a MAX4074/75-specific function).

Key Specifications

Pinout & Package

MAX4078EUD is housed in a 14-pin TSSOP package (JEDEC MO-153, 5.0mm × 4.4mm × 1.2mm body, 0.65mm pitch). Pin assignments are validated per Maxim's official datasheet Figure 16 (TOP VIEW, MAX4078).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2474IDR and LMV324DT, the MAX4078EUD uniquely balances micropower operation (34µA), guaranteed 100pF capacitive-load stability, and extended input common-mode range (down to VEE − 0.15V)-making it optimal for compact, battery-powered sensor interfaces where signal integrity and power efficiency are co-prioritized.

Availability

MAX4078EUD is available at Aetrix Electronics and suitable for portable battery-powered equipment, infrared receivers for remote controls, smart-card readers, and photodiode preamps requiring stable component supply across industrial temperature ranges.

Supply support for MAX4078EUD 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 power, interface, sensing, and timing applications.

The MAX4074–MAX4078 family was engineered to deliver rail-to-rail, micropower op amp performance in ultra-small packages-targeting space- and power-constrained portable instrumentation and consumer electronics.

FAQ

What is the maximum capacitive load the MAX4078EUD can drive without oscillation?

The MAX4078EUD is guaranteed stable with capacitive loads up to 100pF without requiring an isolation resistor. This specification is verified per the manufacturer's electrical characteristics table and typical operating curves (Figure 9–10). Exceeding 100pF may cause peaking or oscillation unless compensated with a series output resistor. The MAX4078EUD's internal compensation is optimized for this exact load limit-no design adjustments are needed for compliant layouts.

Does the MAX4078EUD have internal gain-setting resistors like the MAX4074?

No, the MAX4078EUD does not include internal gain-setting resistors. It is an open-loop, unity-gain-stable op amp intended for user-configured feedback networks. In contrast, the MAX4074/MAX4075 integrate laser-trimmed RF/RG networks for fixed gains. The MAX4078EUD's pinout omits RF/RG connections entirely-its IN+ and IN− pins connect directly to the core amplifier inputs, preserving full design flexibility for custom gain and topology.

What is the input common-mode voltage range of the MAX4078EUD?

The MAX4078EUD specifies an input common-mode voltage range from (VEE − 0.15V) to (VCC − 1.2V) at TA = +25°C. This allows the device to accept signals slightly below ground (when VEE = 0V) and up to 1.2V below the positive rail-critical for interfacing with grounded transducers or rail-referenced sensors. The lower bound is confirmed in the Electrical Characteristics table for MAX4076/MAX4077/MAX4078, and applies identically to the MAX4078EUD.

Is the MAX4078EUD pin-compatible with other devices in the MAX4074–MAX4078 family?

No, the MAX4078EUD is not pin-compatible with MAX4074 or MAX4075 variants. It uses a 14-pin TSSOP package with dedicated IN+/IN−/OUT pins for each of four amplifiers, whereas MAX4074 (SOT23-5) and MAX4075 (µMAX/SO-8) are single/dual fixed-gain devices with different pin counts and internal routing. Even the quad MAX4078EUD differs from MAX4077 (8-pin µMAX/SO) in both pin count and functional assignment-direct substitution requires PCB redesign.

What is the typical supply current per amplifier in the MAX4078EUD at 3V operation?

The typical supply current per amplifier in the MAX4078EUD is 34µA when operated at VCC = 3V and TA = +25°C, as specified in the "ELECTRICAL CHARACTERISTICS-MAX4076/MAX4077/MAX4078" table. This value is measured under standard test conditions (VIN+ = VIN− = VCC/2, RL = ∞) and represents the quiescent draw for one channel. Total device current is approximately 136µA (4 × 34µA) under identical conditions.