Analog Devices Inc./Maxim Integrated MAX952ESA+T

Overview

MAX952ESA+T from Maxim Integrated is an ultra-low-power, single-supply analog IC integrating a decompensated op amp (125kHz GBW, 66V/ms slew rate), rail-to-rail comparator with internal 1.2V ±2% bandgap reference, and reference buffer - all in an 8-pin SO package. It operates from 2.7V to 7V, draws 7μA typical supply current, and targets battery-powered sensor interfaces and low-frequency alarm detection circuits.

For engineers reviewing the MAX952ESA+T datasheet, MAX952ESA+T pinout, MAX952ESA+T application, or MAX952ESA+T equivalent, key selection criteria include its 125kHz gain-bandwidth op amp optimized for AV ≥ 10V/V, comparator with ±3mV internal hysteresis and 40mA continuous output sourcing, rail-to-rail input/output swing down to ground, and integrated 1.2V reference stability over –40°C to +85°C.

Technical Context

The MAX952ESA+T implements a dual-function analog signal chain: its decompensated op amp delivers 125kHz gain bandwidth and 66V/ms slew rate only when configured for closed-loop gains ≥10V/V, while its comparator features a high-impedance input stage with common-mode range from VSS to (VDD – 1.6V) and rail-to-rail CMOS output capable of 40mA continuous sourcing.

Internally, the comparator's inverting input is hardwired to the 1.2V ±2% bandgap reference, eliminating external reference components. The reference output is buffered and rated for ±20μA load, stable with capacitive loads <100pF, and exhibits <1.5% load regulation across ±6μA.

Key Specifications

Pinout & Package

MAX952ESA+T is housed in an 8-pin SO (Small Outline) package, 150mil width, RoHS-compliant, with standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX952ESA+T, MAX952EUA+ offers identical functionality in a smaller footprint but with reduced power dissipation margin, while TLV2302IDR provides greater supply flexibility at the cost of increased component count, layout complexity, and total system current.

Availability

MAX952ESA+T is available at Aetrix Electronics and suitable for battery-powered instruments, low-frequency alarm/detector systems, and photodiode preamplifier designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX952ESA+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 precision analog, mixed-signal, and power management ICs for industrial, medical, and automotive applications.

The MAX951–MAX954 family was engineered specifically for ultra-low-power, single-supply sensor signal chains - combining op amp, comparator, and reference to minimize size, current, and external component count in portable safety and instrumentation systems.

FAQ

What is the maximum capacitive load the MAX952ESA+T reference output can drive?

The MAX952ESA+T reference output is stable only with capacitive loads less than 100pF. Driving larger capacitances - including bypass capacitors - causes oscillation and output instability. For filtering, use an RC low-pass network (e.g., 10kΩ + 100pF) between REF and downstream circuitry, as documented in Maxim's application notes for infrared receiver designs. Do not connect any capacitor directly to the REF pin of MAX952ESA+T.

Can the op amp in MAX952ESA+T be used at unity gain?

No - the op amp in MAX952ESA+T is decompensated and unstable at unity gain. It is specified only for closed-loop gains of 10V/V or greater, with 125kHz gain bandwidth and 66V/ms slew rate under those conditions. For unity-gain stable operation, use MAX951ESA+T instead, which shares the same pinout and package but features internally compensated op amp architecture.

Does MAX952ESA+T support rail-to-rail input common-mode voltage?

MAX952ESA+T supports rail-to-rail output swing, but its input common-mode range extends only from VSS to (VDD – 1.6V). This means the op amp and comparator inputs cannot accept signals within 1.6V of VDD. For example, with VDD = 5V, maximum valid input is 3.4V. This limitation is inherent to the input stage design and must be accounted for in sensor biasing networks.

What is the purpose of the internal hysteresis in the MAX952ESA+T comparator?

The internal ±3mV hysteresis in the MAX952ESA+T comparator prevents output oscillation when input signals change slowly or contain noise near the trip threshold. It creates distinct upper and lower switching points, ensuring clean, bounce-free digital transitions - critical in smoke detector alarm triggering and low-frequency RF alarm receivers where input slew rates are inherently low.

How does the MAX952ESA+T reference accuracy vary with temperature?

The MAX952ESA+T reference voltage is specified at 1.200V ±2% over the full operating temperature range of –40°C to +85°C. Typical characterization shows drift of less than ±5mV across that range, with worst-case deviation bounded by the ±2% initial tolerance. This stability eliminates need for system-level calibration in applications like battery voltage monitors and fixed-threshold detectors.