Analog Devices Inc./Maxim Integrated MAX492ESA+T

Overview

MAX492ESA+T from Maxim Integrated is a dual, micropower, single-supply rail-to-rail operational amplifier optimized for low-voltage battery-powered systems. It operates from +2.7V to +6V, delivers 500kHz gain-bandwidth, draws ≤150µA per amplifier, and achieves rail-to-rail input common-mode range (VEE to VCC) and output swing (within 50mV of rails into 100kΩ). It is used in portable instrumentation signal conditioning where precision, ultra-low quiescent current, and wide dynamic range are critical.

For engineers reviewing the MAX492ESA+T datasheet, MAX492ESA+T pinout, MAX492ESA+T application, or MAX492ESA+T equivalent, this page provides verified specifications, package mapping to 8-pin SO, functional context for rail-to-rail DC-coupled buffering, and validated alternative options for low-voltage op-amp selection.

Technical Context

The MAX492ESA+T implements a dual complementary-input-stage architecture (NPN/PNP parallel) enabling true rail-to-rail input operation with no phase reversal beyond the specified common-mode range. Its folded-cascode output stage supports rail-to-rail output swing while maintaining stability driving ≥1nF capacitive loads and 1kΩ resistive loads.

DC accuracy is achieved via laser-trimmed input offset voltage (±200µV max at +25°C, ±950µV over –40°C to +85°C) and high PSRR (110dB typ), CMRR (90dB typ), and open-loop gain (108dB typ), all sustained across its full operating supply range and temperature grade (–40°C to +85°C).

Key Specifications

Pinout & Package

MAX492ESA+T is housed in an 8-pin SO (Small Outline) package, pin-compatible with industry-standard dual op-amp footprints. Thermal performance is rated at 471mW continuous power dissipation at +70°C (derating 5.88mW/°C above).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2462IDR and AD8602ARMZ, MAX492ESA+T uniquely balances micropower operation (≤150µA), true rail-to-rail input (VEE to VCC), and adequate bandwidth (500kHz) for precision low-voltage portable systems - making it optimal where battery longevity and full dynamic range are co-priorities.

Availability

MAX492ESA+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data acquisition, and low-voltage industrial transmitters requiring stable component supply and long-term design-in support.

Supply support for MAX492ESA+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, communications, and consumer applications.

The MAX492/MAX494/MAX495 family was designed specifically for micropower, single-supply, rail-to-rail signal conditioning in battery-constrained portable and remote sensing systems.

FAQ

What is the operating temperature range for MAX492ESA+T?

The MAX492ESA+T is rated for operation from –40°C to +85°C. This extended industrial temperature range ensures reliable performance in portable equipment exposed to ambient variations, such as handheld test instruments and outdoor environmental sensors. The device maintains specified DC accuracy (e.g., ±950µV input offset) and AC performance (e.g., 500kHz GBW) across this full range, as confirmed in the datasheet's –40°C to +85°C DC electrical characteristics table.

Does MAX492ESA+T support true rail-to-rail input and output?

Yes, MAX492ESA+T supports true rail-to-rail input common-mode voltage range (VEE to VCC) and rail-to-rail output swing (within 50mV of VEE/VCC into 100kΩ). This is enabled by its dual complementary input stage and folded-cascode output architecture. Unlike many "rail-to-rail" op amps, MAX492ESA+T guarantees no phase reversal when inputs exceed the supply rails - a key feature validated in the Applications Information section of the datasheet.

Can MAX492ESA+T drive large capacitive loads without oscillation?

Yes, MAX492ESA+T is explicitly characterized for stability with capacitive loads exceeding 1000pF under standard conditions (e.g., unity-gain follower with RL ≥ 100kΩ), as shown in Figure 6 and the Capacitive-Load Stable Region plot (Figure 5). Its internal compensation eliminates the need for external isolation resistors in most applications, preserving low-frequency accuracy - a documented advantage over competing CMOS rail-to-rail op amps.

Is there an offset null capability on MAX492ESA+T?

No, MAX492ESA+T does not provide external offset null pins. Offset adjustment is only available on the single-channel MAX495 variant (via NULL1 and NULL2 pins). The MAX492ESA+T relies on factory laser trimming to achieve ±200µV typical input offset voltage at +25°C and ±950µV maximum over –40°C to +85°C - sufficient for most 12-bit precision applications without user trimming.

What is the maximum capacitive load MAX492ESA+T can drive while sourcing ~100µA?

When sourcing approximately 100µA, MAX492ESA+T maintains stability with up to 400pF of output capacitance, as defined in the Capacitive-Load Stable Region graph (Figure 5). At higher or lower output currents, stability improves - enabling robust operation with 1000pF loads in unity-gain configurations (Figure 6) and 500pF loads with various resistive terminations (Figures 7a–7c), all verified in the datasheet's Typical Operating Characteristics.