Analog Devices Inc./Maxim Integrated MAX9101EUK

Overview

The MAX9101EUK from Maxim Integrated 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, supports rail-to-rail input common-mode range (0V to VCC–0.2V), and features open-drain output compatible with mixed-voltage logic interfaces - used in portable instrumentation and sensor monitoring circuits.

For engineers reviewing the MAX9101EUK datasheet, MAX9101EUK pinout, MAX9101EUK application, or MAX9101EUK 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, -40°C to +85°C temperature rating, and SOT23-5 package compatibility with space-constrained portable designs.

Technical Context

The MAX9101EUK uses a BiCMOS input stage enabling rail-to-rail input operation down to 1.0V supply, with input bias current ±5nA (typ) within specified common-mode range and ±30nA (max) over full temperature range. Its open-drain output stage allows pull-up to +6V independent of VCC, supporting level translation between disparate logic domains.

Propagation delay remains under 4µs across 1.0V–5.5V supply range and -40°C to +85°C, with minimal variation versus input overdrive (e.g., 3.3µs at 50mV overdrive, VCC = +1.0V). Input hysteresis is fixed at ±2mV, enhancing noise immunity without external components.

Key Specifications

Pinout & Package

MAX9101EUK is housed in a 5-pin SOT23-5 surface-mount package (package code U5-1), footprint-compatible with industry-standard SOT23 layouts and reflow-process ready.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3701DBVR and MAX9062AXK+T, the MAX9101EUK uniquely combines true 1.0V operation, 5µA IQ, <4µs delay, and open-drain output - making it the sole option for high-speed, ultra-low-voltage mixed-logic sensing in space- and energy-constrained portable systems.

Availability

MAX9101EUK is available at Aetrix Electronics and suitable for battery voltage monitoring, sensor wake-up circuits, logic-level translation, and portable medical sensor interfaces requiring stable component supply across long-lifecycle portable electronics programs.

Supply support for MAX9101EUK 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, automotive, and portable applications.

The MAX9100/MAX9101 family was engineered specifically for micropower, ultra-low-voltage comparator functions in single-cell battery systems - prioritizing sub-1V operation, nanoamp-level current, and SOT23-5 integration.

FAQ

What is the minimum operating voltage for the MAX9101EUK?

The MAX9101EUK is fully specified to operate down to +1.0V supply voltage, enabling direct interfacing with nearly depleted alkaline, NiMH, or lithium primary cells. At 1.0V, it maintains functional performance including 5µA quiescent current, rail-to-rail input range, and <4µs propagation delay - confirmed across -40°C to +85°C per datasheet electrical characteristics.

Does the MAX9101EUK have internal hysteresis, and how much?

Yes, the MAX9101EUK includes fixed internal hysteresis of ±2mV, improving noise immunity for slow-moving or noisy input signals without external components. This value is specified in the Electrical Characteristics table and applies across the full operating temperature and supply voltage range, eliminating need for external positive feedback networks in basic threshold detection.

Can the MAX9101EUK output drive a 5kΩ pull-up resistor to 3.3V while powered from 1.0V?

Yes - the MAX9101EUK open-drain output is rated for up to +6V on the drain terminal regardless of VCC. When powered from 1.0V and pulled up to 3.3V via 5kΩ, it sinks ≥0.5mA with VOL ≤75mV (at 0.5mA, +1.0V, +25°C), ensuring clean logic-low assertion and robust noise margin in mixed-voltage level translation applications.

Is the MAX9101EUK pin-compatible with the MAX9100EUK?

Yes - both MAX9101EUK and MAX9100EUK share identical SOT23-5 pinout (OUT, GND, IN+, IN-, VCC) and footprint. The only functional difference is output architecture: MAX9100EUK has push-pull CMOS output, while MAX9101EUK has open-drain. No PCB layout change is required when substituting between them, though external pull-up is mandatory for MAX9101EUK operation.

What is the input bias current specification for the MAX9101EUK over temperature?

The MAX9101EUK input bias current is ±30nA maximum over the full -40°C to +85°C operating range, with ±5nA typical at +25°C and within the specified input common-mode range (0V to VCC–0.2V). This low, stable bias current minimizes voltage errors in high-impedance sensor interfaces such as thermistor or photodiode circuits.