Analog Devices Inc./Maxim Integrated MAX4131EBT+T

Overview

MAX4131EBT+T from Maxim Integrated is a single-channel, rail-to-rail input/output operational amplifier optimized for low-voltage, single-supply precision signal conditioning. It delivers 10MHz gain-bandwidth, 900µA quiescent current per amplifier, ±0.35mV (typ) input offset voltage at +25°C, and operates from +2.7V to +6.5V. It is used in battery-powered data-acquisition front-ends where rail-to-rail swing and low power are critical.

For engineers reviewing the MAX4131EBT+T datasheet, MAX4131EBT+T pinout, MAX4131EBT+T application, or MAX4131EBT+T equivalent, key selection criteria include shutdown functionality (25µA), UCSP package footprint (1mm × 1.5mm), output drive capability into 250Ω, unity-gain stability, and guaranteed operation down to –40°C to +85°C.

Technical Context

The MAX4131EBT+T employs a dual-input-stage architecture-comprising complementary NPN and PNP differential pairs-to achieve rail-to-rail common-mode input range extending 200mV beyond VEE and VCC. This enables full-swing operation with inputs near ground or supply rails without phase reversal.

Its output stage uses a Class AB topology capable of sourcing/sinking >50mA while maintaining rail-to-rail swing into 250Ω loads. The amplifier is unity-gain stable and remains stable with up to 160pF capacitive loads, eliminating need for external compensation in most sensor interface applications.

Key Specifications

Pinout & Package

MAX4131EBT+T is housed in a 6-bump, 1mm × 1.5mm wafer-level chip-scale package (UCSP™) with bottom-side solder bumps. The package is RoHS-compliant and designed for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV9001IDCKR and OPA316IDBVR, MAX4131EBT+T uniquely combines rail-to-rail input *and* output, integrated shutdown, and guaranteed –40°C to +85°C performance in a 1mm × 1.5mm UCSP-making it the only option for space-constrained, battery-operated, wide-input-range precision signal chains.

Availability

MAX4131EBT+T is available at Aetrix Electronics and suitable for battery-powered instruments, portable medical devices, and industrial sensor transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4131EBT+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 high-performance analog and mixed-signal ICs for precision, power, and interface applications in industrial, medical, and communications systems.

The MAX4130–MAX4134 family was engineered specifically for low-voltage, single-supply data-acquisition systems demanding rail-to-rail operation, low quiescent current, and robust AC performance-addressing limitations of legacy op amps in portable and energy-sensitive instrumentation.

FAQ

What is the maximum capacitive load the MAX4131EBT+T can drive while remaining stable?

The MAX4131EBT+T is unity-gain stable and maintains phase margin with capacitive loads up to 160pF, as verified in the datasheet's Typical Operating Characteristics (Figure 4). Driving larger loads (e.g., >200pF) requires an isolation resistor (e.g., 39Ω) in series with the output to restore stability-no internal compensation is needed for standard ADC input capacitance or PCB trace parasitics.

Does the MAX4131EBT+T support true rail-to-rail input operation across its full temperature range?

Yes. The MAX4131EBT+T guarantees a common-mode input voltage range of VEE – 0.20V to VCC + 0.20V over the full –40°C to +85°C operating temperature range, enabling reliable operation with inputs at ground or supply rail in battery-powered systems where supply voltage varies.

How does the shutdown function affect the output state of the MAX4131EBT+T?

When SHDN is pulled low (<0.8V), the MAX4131EBT+T disables its internal circuitry and places the OUT pin in a high-impedance state-neither sourcing nor sinking current. This prevents loading of downstream circuitry (e.g., ADC inputs or multiplexers) and reduces supply current to 25µA (typ), as specified in the DC Electrical Characteristics table.

Can the MAX4131EBT+T operate from a +1.8V supply?

While the absolute minimum specified supply is +2.7V, the MAX4131EBT+T typically operates down to +1.8V, as documented in Figure 21 (Minimum Operating Voltage vs. Temperature). However, AC performance (e.g., GBW, slew rate) and output drive strength degrade below +2.7V, so +1.8V operation is only recommended for DC or very low-frequency applications with relaxed speed requirements.

What is the input bias current behavior near the common-mode transition region?

The MAX4131EBT+T uses complementary NPN/PNP input stages, causing input bias current polarity to reverse near VCC/2. At +25°C, IB is ±50nA (typ) across the full common-mode range, but peaks to ±160nA (max) over temperature. To minimize offset error, match source impedances at IN+ and IN− (per Figures 1a/1b) rather than relying on cancellation alone.