Analog Devices Inc./Maxim Integrated MAX4162ESA+T

Overview

MAX4162ESA+T from Maxim Integrated is a single-channel, micropower rail-to-rail input/output operational amplifier optimized for ultra-low-power, single-supply systems. It delivers 200kHz gain-bandwidth product, 25μA quiescent current per amplifier, ±0.5mV typical input offset voltage (25°C), and full rail-to-rail output swing within 30mV of supply rails at 10kΩ load - enabling precision signal conditioning in battery-powered pH probes and portable medical instruments.

For engineers reviewing the MAX4162ESA+T datasheet, MAX4162ESA+T pinout, MAX4162ESA+T application, or MAX4162ESA+T equivalent, this page provides verified electrical specifications, SO-8 package terminal mapping, real-world use cases in low-voltage sensing, and validated alternative op amps with documented functional trade-offs.

Technical Context

The MAX4162ESA+T employs a proprietary BiCMOS charge-pump architecture that generates internal rails ±2V beyond VDD/VSS, enabling true rail-to-rail input common-mode range extending 250mV beyond both supply rails and maintaining high CMRR (>70dB) without mid-swing nonlinearity. This eliminates phase reversal on overdriven inputs and sustains >85dB open-loop gain across temperature.

Its unity-gain stable design drives any capacitive load without external compensation, supported by 115V/ms slew rate and 50µs settling time to 0.1% for 1V→2V steps. The internal charge pump operates at 700kHz, contributing <100µV_P-P feedthrough noise - negligible within its 200kHz bandwidth.

Key Specifications

Pinout & Package

MAX4162ESA+T is housed in an 8-pin SO (Small Outline) package with lead(Pb)-free/RoHS-compliant finish. The package footprint matches JEDEC MS-012AC standard (body width 3.9mm, lead pitch 1.27mm), compatible with automated SMT assembly and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar micropower rail-to-rail op amp applications.

Compared with TLV8512IDR and LTC1540CMS8#TRPBF, the MAX4162ESA+T uniquely balances 200kHz bandwidth, 25μA supply current, and true rail-to-rail I/O with extended common-mode range - making it optimal for precision, low-power, wide-dynamic-range analog front-ends where all three attributes are simultaneously required.

Availability

MAX4162ESA+T is available at Aetrix Electronics and suitable for pH measurement systems, portable medical sensors, low-power industrial transmitters, and battery-powered environmental monitors requiring stable component supply across multi-year production cycles.

Supply support for MAX4162ESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX4162ESA+T belongs to Maxim's UCSP/Micropower Op Amp family, designed specifically for ultra-low-power, single-supply signal conditioning in space-constrained, battery-operated equipment where rail-to-rail performance and nanopower consumption are mandatory.

FAQ

What is the maximum capacitive load the MAX4162ESA+T can drive while remaining stable?

The MAX4162ESA+T is unity-gain stable and explicitly characterized to drive any capacitive load without external compensation - including 1µF as demonstrated in Figure 36 of the datasheet. This eliminates the need for isolation resistors in piezoelectric or capacitive sensor interfaces, preserving signal integrity and simplifying PCB layout. The MAX4162ESA+T achieves this via internal compensation tailored to its BiCMOS charge-pump architecture.

Does the MAX4162ESA+T require external components for its internal charge pump to operate?

No, the MAX4162ESA+T's internal 700kHz charge pump requires no external components - it is fully self-contained within the die. The pump generates auxiliary rails ±2V beyond VDD/VSS to enable true rail-to-rail I/O, and its operation is transparent in most applications. Only standard 1µF + 0.1µF VDD bypassing is needed to suppress residual 700kHz feedthrough noise (<100µV_P-P). The MAX4162ESA+T powers up fully within 20µs.

Can the MAX4162ESA+T operate from a 2.0V supply despite the 2.5V minimum rating?

Yes - the datasheet notes that the MAX4162ESA+T "typically provides full rail-to-rail operation below 2.0V" (Figure 1), though the guaranteed specification starts at 2.5V. At 2.0V, it maintains rail-to-rail input range and usable output swing, but parameters like GBW (reduced), PSRR (degraded), and output drive capability may fall outside guaranteed limits. For production designs, use 2.5V–10V; for prototyping at 2.0V, validate performance empirically. The MAX4162ESA+T remains functional but not fully specified below 2.5V.

What is the purpose of the No-Connection (N.C.) pins on the MAX4162ESA+T SO package?

Pins 1, 5, and 8 of the MAX4162ESA+T SO package are designated No-Connection (N.C.) - they are not bonded to the die and serve no electrical function. Per Maxim's recommendation, these pins should be left unconnected (floating) or optionally tied to ground for mechanical stability or EMI reduction; neither choice affects device operation. They are not used for thermal dissipation or internal test access. The MAX4162ESA+T functionality depends solely on pins 2 (IN−), 3 (IN+), 4 (VSS), 6 (OUT), and 7 (VDD).

How does the MAX4162ESA+T prevent phase reversal when inputs exceed the supply rails?

The MAX4162ESA+T avoids phase reversal through its proprietary input stage architecture, which maintains high common-mode rejection ratio (>70dB) across the full extended input range (VSS−0.25V to VDD+0.25V). Unlike conventional rail-to-rail op amps that exhibit crossover distortion or CMRR collapse near rails, the MAX4162ESA+T's BiCMOS design sustains linear operation and correct polarity even during overdrive events - a feature confirmed by CMRR testing and explicitly cited in the Applications Information section. This behavior is intrinsic to the MAX4162ESA+T and requires no external circuitry.