Analog Devices Inc./Maxim Integrated MAX9077EKA-T

Overview

MAX9077EKA-T from Maxim Integrated is a dual ultra-low-power rail-to-rail comparator optimized for 2.1V–5.5V single-supply operation, delivering 580ns propagation delay at just 3µA per comparator, with ground-sensing inputs and push-pull outputs driving up to 2mA - ideal for battery-powered threshold detection in portable IR receivers and keyless entry systems.

For engineers reviewing the MAX9077EKA-T datasheet, MAX9077EKA-T pinout, MAX9077EKA-T application, or MAX9077EKA-T equivalent, this device supports precise low-voltage analog decision-making where supply current < 4µA, input common-mode range down to 0V, and rail-to-rail output swing are critical selection criteria.

Technical Context

The MAX9077EKA-T integrates two independent comparators on a BiCMOS process, each featuring no differential input clamp and no phase inversion under overdrive - enabling robust operation across full rail-to-rail differential input voltages. Its push-pull output stage eliminates external pull-up resistors and ensures TTL/CMOS-compatible logic levels.

Input bias current is typically −5nA, and input offset voltage is ±1mV (max), supporting accurate threshold detection even at sub-100mV overdrive. The device maintains stable propagation delay (580ns typ.) across −40°C to +85°C and supply voltages from 2.1V to 5.5V without performance degradation.

Key Specifications

Pinout & Package

MAX9077EKA-T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant matte-tin plating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-power comparator applications.

Compared with TLV3702IDR and LMV7235M5X, the MAX9077EKA-T uniquely combines ground-sensing inputs, rail-to-rail push-pull outputs, and sub-600ns delay at 3µA - making it the only option that simultaneously satisfies zero-volt threshold detection, direct CMOS interfacing, and fast pulse capture in space-constrained portable designs.

Availability

MAX9077EKA-T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors/discriminators, and keyless entry systems requiring stable component supply, full RoHS compliance, and guaranteed −40°C to +85°C operation.

Supply support for MAX9077EKA-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 MAX9075/MAX9077 family was designed specifically for ultra-low-power portable systems requiring precision analog decision-making with minimal board area - targeting applications where every microamp and square millimeter matters.

FAQ

What is the maximum operating supply voltage for MAX9077EKA-T?

The MAX9077EKA-T has an absolute maximum supply voltage of 6V, but its specified operating range is 2.1V to 5.5V. Operation above 5.5V voids parametric guarantees and risks permanent damage. All electrical characteristics in the datasheet - including propagation delay, offset voltage, and output swing - are validated only within the 2.1V–5.5V range. For 5V systems, MAX9077EKA-T delivers full rail-to-rail output swing and 580ns delay with 3µA supply current.

Does MAX9077EKA-T support true ground-referenced input signals?

Yes. The MAX9077EKA-T features a common-mode input voltage range extending to −0.2V relative to GND, enabling direct connection to 0V-referenced sensors such as thermistors, photodiodes, or resistive bridges. This ground-sensing capability is confirmed in the Electrical Characteristics table (V_CMR = 0V to V_CC − 1.2V) and verified across temperature. Unlike many comparators, MAX9077EKA-T does not require a negative supply or level-shifting circuitry for true 0V threshold detection.

Can MAX9077EKA-T drive standard TTL or CMOS logic directly?

Yes. MAX9077EKA-T provides rail-to-rail push-pull outputs capable of sinking and sourcing up to 2mA while maintaining VOL ≤ 0.4V and VOH ≥ V_CC − 0.4V across its full operating range. At V_CC = 3.3V, this yields VOH ≥ 2.9V and VOL ≤ 0.4V - meeting 3.3V TTL and CMOS input thresholds. No external pull-up resistors are needed, simplifying PCB layout and reducing BOM count. This behavior is explicitly characterized in the Electrical Characteristics table and confirmed in Typical Operating Characteristics plots.

Is MAX9077EKA-T pin-compatible with other dual comparators in SOT23-8?

No. MAX9077EKA-T uses a proprietary pinout: Pin 1 = GND, Pin 2 = INA−, Pin 3 = INA+, Pin 4 = V_CC, Pin 5 = OUTA, Pin 6 = INB−, Pin 7 = INB+, Pin 8 = OUTB. This differs from industry-standard dual comparators (e.g., LM393, TLV3702), which place V_CC on Pin 8 and GND on Pin 4. PCB layout must follow the MAX9077EKA-T-specific footprint (land pattern 90-0176); direct replacement requires board revision.

What is the input offset voltage specification for MAX9077EKA-T over temperature?

The MAX9077EKA-T has a maximum input offset voltage of ±8mV over the full −40°C to +85°C operating range, with ±1mV typical at +25°C. This is guaranteed in the Electrical Characteristics table under "V_OS Input Offset Voltage" with test condition TA = TMIN to TMAX. The offset drift versus temperature is characterized in Figure MAX9075 toc12, showing < ±0.5mV variation from +25°C to +85°C at V_CC = 5V - confirming stability for precision threshold applications across environmental conditions.