Analog Devices Inc./Maxim Integrated MAX965ESA+

Overview

The MAX965ESA+ from Maxim Integrated is a single, micropower, rail-to-rail input/output comparator with integrated 1.235V ±1.5% reference and programmable hysteresis. It operates from +1.6V to +5.5V, draws only 7–12 µA supply current, features open-drain output capable of sinking beyond VCC up to +6V, and is rated for -40°C to +85°C. It is used in ultra-low-voltage 2-cell battery-powered systems for threshold detection and voltage-level translation.

For engineers reviewing the MAX965ESA+ datasheet, MAX965ESA+ pinout, MAX965ESA+ application, or MAX965ESA+ equivalent, key selection factors include its 1.235V internal reference accuracy, 10 µs propagation delay (50mV overdrive), rail-to-rail input common-mode range down to -0.25V, open-drain output flexibility, and SO-8 package compatibility with space-constrained portable designs.

Technical Context

The MAX965ESA+ implements a precision bandgap-based 1.235V reference with ±1.5% tolerance over 0°C to +85°C and ±2.5% over -40°C to +85°C, sourcing up to 50 µA. Its comparator core supports rail-to-rail inputs (-0.25V to VCC) and open-drain outputs with leakage <100 nA at 5.5V.

Hysteresis is programmable via the HYST pin using external resistors, enabling adjustable hysteresis bands from ±1 mV to ±50 mV; the internal hysteresis structure causes band variation with common-mode voltage, peaking near rail extremes.

Key Specifications

Pinout & Package

MAX965ESA+ is housed in an 8-pin SO (Small Outline) package (package code S8-2), RoHS-compliant, with standard 1.27 mm pitch and 5.0 mm × 6.2 mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3691IDBVR and LMV7215M5X, the MAX965ESA+ uniquely combines micropower operation, integrated ±1.5% reference, and programmable hysteresis in an SO-8 package-enabling simpler, more reliable threshold detection in battery-critical applications without external components.

Availability

MAX965ESA+ is available at Aetrix Electronics and suitable for 2-cell battery-powered systems, threshold detectors/discriminators, and voltage-level translation applications requiring stable component supply and long-term industrial availability.

Supply support for MAX965ESA+ 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 MAX965ESA+ belongs to the MAX965–MAX970 family of micropower comparators designed specifically for ultra-low-voltage, rail-to-rail operation in portable and energy-harvesting systems where supply headroom and quiescent current are critical.

FAQ

What is the operating temperature range for the MAX965ESA+?

The MAX965ESA+ is specified for operation from -40°C to +85°C. This extended industrial temperature range ensures reliable performance in portable medical devices, outdoor sensors, and automotive cabin electronics where ambient conditions vary widely. All key parameters-including reference voltage accuracy, supply current, and propagation delay-are guaranteed across this full range.

Does the MAX965ESA+ require external components to use its internal reference?

Yes, the MAX965ESA+ internal 1.235V reference (on pin 3) requires a 0.1 µF ceramic bypass capacitor connected between REF and GND to minimize noise and ensure stability. Without this capacitor, reference output noise increases significantly-up to ~1.0 mVpp-degrading comparator accuracy in precision threshold applications. No other external components are needed to enable basic reference functionality.

Can the MAX965ESA+ operate below +1.6V supply voltage?

The MAX965ESA+ is fully specified down to +1.6V, but it can operate down to approximately +1.0V with degraded performance: reference output becomes unstable below +1.5V, propagation delay increases, and output sink capability weakens. For robust, guaranteed operation-including reference accuracy and hysteresis control-the supply must remain ≥+1.6V. Applications requiring sub-1.6V operation should implement external supervision or latching.

How is hysteresis programmed on the MAX965ESA+?

Hysteresis on the MAX965ESA+ is programmed by connecting two external resistors: R1 between REF (pin 3) and HYST (pin 4), and R2 between HYST and GND (pin 8). This creates a voltage divider that sets the HYST pin voltage, yielding a hysteresis band (VHB) ≈ 2 × (VREF − VHYST). With R1 = 2.4 MΩ and R2 = 2.4 MΩ, VHB ≈ ±25 mV. The HYST pin voltage must stay within VREF − 50 mV to VREF.

What package type is used for the MAX965ESA+?

The MAX965ESA+ uses an 8-pin SO (Small Outline) package with standard 1.27 mm lead pitch and 5.0 mm × 6.2 mm body dimensions (package code S8-2). It is RoHS-compliant, surface-mount compatible, and pin-compatible with industry-standard SO-8 footprints-enabling drop-in replacement in existing layouts designed for similar comparators or op-amps.