Analog Devices Inc./Maxim Integrated MAX9101ESA+

Overview

MAX9101ESA+ from Analog Devices is an ultra-low-voltage, micropower open-drain comparator optimized for single-cell battery-powered systems. It operates from 1.0V to 5.5V supply, draws only 5μA quiescent current, delivers <4μs propagation delay, and features rail-to-rail input common-mode range (0V to VCC − 0.2V) and open-drain output compatible with mixed-voltage logic interfaces - enabling use in portable instrumentation and sensor monitoring circuits.

For engineers reviewing the MAX9101ESA+ datasheet, MAX9101ESA+ pinout, MAX9101ESA+ application, or MAX9101ESA+ equivalent, key selection criteria include its 1.0V minimum operating voltage, 5μA supply current at +1V, open-drain output with ≤0.2μA leakage at +5.5V, and guaranteed −40°C to +85°C operation in SO-8 package.

Technical Context

The MAX9101ESA+ uses a BiCMOS input stage with rail-to-rail input capability down to 0V and up to VCC − 0.2V, delivering ±10mV max input offset voltage over temperature and ±5nA typical input bias current within spec range. Its open-drain output supports pull-up to +6V independent of VCC, enabling level translation between 1V and 3V/5V domains without external level shifters.

Propagation delay remains under 4.5μs across 1.0V–5.5V supply and −40°C to +85°C, with rise/fall times not applicable (open-drain), and no phase reversal on overdriven inputs. Power-up time is 250ns, and input capacitance is 3pF - supporting stable operation with minimal bypassing even in low-impedance sensor interfaces.

Key Specifications

Pinout & Package

MAX9101ESA+ is housed in an 8-pin plastic SO (SO-8) package, measuring 4.9mm × 3.9mm × 1.75mm, with standard JEDEC MS-012AC footprint and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3691IDBVR and MAX9062ASA+, the MAX9101ESA+ uniquely supports 1.0V operation with 5μA IQ and open-drain output - making it the only option for true single-cell, low-leakage, mixed-rail sensor interfacing where supply headroom is constrained.

Availability

MAX9101ESA+ is available at Aetrix Electronics and suitable for portable instrumentation, battery monitoring, low-voltage sensor interfaces, and mixed-voltage logic translation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX9101ESA+ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The MAX9100/MAX9101 family was designed specifically for ultra-low-voltage, micropower comparator applications in space-constrained, battery-operated systems - emphasizing 1.0V functionality, rail-to-rail input, and flexible output architecture.

FAQ

What is the minimum supply voltage supported by the MAX9101ESA+?

The MAX9101ESA+ is fully specified to operate down to 1.0V supply voltage - verified across −40°C to +85°C. At 1.0V, propagation delay is 3.7μs (max), supply current is 5.0μA (typ), and input common-mode range extends from 0V to 0.8V. This enables direct use with single alkaline, zinc-air, or emerging 1.0V energy-harvesting sources without regulation.

Does the MAX9101ESA+ have internal hysteresis, and how much?

Yes, the MAX9101ESA+ includes 1.0mV typical internal hysteresis - specified as ±2mV max in the Electrical Characteristics table. This built-in hysteresis improves noise immunity in slow-moving or noisy input signals, eliminating the need for external positive feedback resistors in basic threshold-detection applications such as battery low-voltage alarms or sensor trip-point monitoring.

Can the MAX9101ESA+ output be pulled up to a voltage higher than its VCC supply?

Yes - the MAX9101ESA+ open-drain output is rated for up to +6.0V relative to GND, independent of VCC. For example, when powered from +1.0V, the OUT pin can be pulled up to +3.3V or +5.0V using an external resistor. This enables robust level translation between disparate voltage domains, a key design advantage confirmed in the Absolute Maximum Ratings and Applications Information sections.

What is the maximum sink current capability of the MAX9101ESA+ output?

The MAX9101ESA+ output does not specify a maximum sink current limit in absolute terms, but its open-drain structure supports continuous short-circuit to GND (per Absolute Maximum Ratings). In practice, output voltage low (VOL) is characterized up to 5mA sink at +5.0V supply (100–180mV), and up to 0.5mA at +1.0V (15–75mV). Designers should size the pull-up resistor to limit current based on VOL requirements and power budget.

Is the MAX9101ESA+ pin-compatible with the MAX9100ESA?

No - the MAX9101ESA+ and MAX9100ESA share identical SO-8 pinouts per the Pin Description table (pins 1,5,8 = N.C.; 2 = GND; 3 = IN+; 4 = IN−; 6 = OUT; 7 = VCC), but their output stages differ fundamentally: MAX9100ESA has push-pull CMOS output, while MAX9101ESA+ has open-drain. Swapping them requires verifying external circuit compatibility - especially pull-up presence and load drive requirements - as they are functional alternatives, not pin-compatible drop-in replacements.