Analog Devices Inc./Maxim Integrated MAX987EUK

Overview

MAX987EUK from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output comparator with push-pull output stage, operating from +2.5V to +5.5V supply, delivering 120ns propagation delay, 48µA quiescent current per comparator, and ±0.5mV typical input offset voltage. It is used in portable battery-powered systems for zero-crossing detection and threshold monitoring where low power and fast response are critical.

For engineers reviewing the MAX987EUK datasheet, MAX987EUK pinout, MAX987EUK application, or MAX987EUK equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support details specific to the SOT23-5 packaged MAX987EUK variant.

Technical Context

The MAX987EUK employs a proprietary output stage that minimizes supply-current surges during switching-reducing supply glitches and eliminating need for large decoupling capacitors. Its input common-mode range extends 250mV beyond both rails (–0.25V to VCC + 0.25V), enabling robust operation with overdriven inputs without phase reversal.

It features internal hysteresis (±2.5mV), rail-to-rail output swing capable of sourcing/sinking up to 8mA, and operates across –40°C to +85°C. The device is optimized for high-speed, low-power signal conditioning in space-constrained applications where supply noise sensitivity and battery life are critical.

Key Specifications

Pinout & Package

The MAX987EUK is housed in a RoHS-compliant 5-pin SOT23-5 package (pkg code U5-1), with 1.6mm × 1.6mm footprint and 0.95mm height - optimized for ultra-compact PCB layouts in wearables and handheld devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3701IDBVR and LMV7235M5X, the MAX987EUK uniquely combines 120ns speed, 48µA quiescent current, rail-to-rail I/O, push-pull output, and built-in hysteresis - making it optimal for compact, battery-sensitive, high-fidelity signal detection where all four attributes are simultaneously required.

Availability

MAX987EUK is available at Aetrix Electronics and suitable for portable power monitoring, zero-crossing detection, IR receiver front-ends, and sensor threshold discrimination requiring stable component supply across industrial, medical, and consumer electronics programs.

Supply support for MAX987EUK 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 and mixed-signal ICs for power, sensing, and signal processing in demanding environments.

The MAX987EUK belongs to Maxim's micropower comparator family engineered for ultra-low-power, high-speed signal conditioning in battery-operated and space-constrained systems.

FAQ

What is the operating temperature range for the MAX987EUK?

The MAX987EUK is specified to operate reliably from –40°C to +85°C. This industrial-grade temperature range is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet, and applies to all variants including the SOT23-5 packaged MAX987EUK. No derating is required within this span, and performance parameters such as propagation delay and input offset voltage are guaranteed across the full range.

Does the MAX987EUK have internal hysteresis, and how much?

Yes, the MAX987EUK includes internal hysteresis of ±2.5mV, as explicitly stated in the Applications Information section of the datasheet. This fixed hysteresis band improves noise immunity for slow-moving or noisy input signals - eliminating the need for external positive-feedback networks in many threshold-detection applications. The value is consistent across all temperature conditions and supply voltages within specification.

Can the MAX987EUK be used with dual supplies, and what are the limits?

Yes, the MAX987EUK supports dual-supply operation from ±1.25V to ±2.75V, as documented in the General Description. When configured with dual supplies, VEE becomes the negative rail (e.g., –2.5V) and VCC the positive rail (e.g., +2.5V), maintaining the same 5V total supply range. The absolute maximum rating remains 6V between VCC and VEE, and all electrical specifications - including input common-mode range and output swing - scale accordingly.

What is the maximum capacitive load the MAX987EUK output can drive while maintaining 120ns propagation delay?

The MAX987EUK maintains its 120ns propagation delay (typical) with up to 15pF capacitive load, as shown in the "Propagation Delay vs. Capacitive Load" graph (TOC8) in the datasheet. At 50pF, delay increases to ~150ns, and at 200pF it reaches ~200ns. For designs requiring strict timing, layout parasitics and PCB trace capacitance must be kept below 10pF, and output traces should be short and unbranched to preserve the specified speed.

Is the MAX987EUK pin-compatible with other comparators in the MAX987/MAX988 family?

No - the MAX987EUK (push-pull output) is not pin-compatible with the MAX988EUK (open-drain output), despite sharing the same SOT23-5 package and pin numbering. Their output stages differ fundamentally: MAX987EUK pin 5 is a push-pull driver, while MAX988EUK pin 5 is open-drain and requires an external pull-up. Swapping them without circuit modification will cause functional failure. Always verify output topology before substitution.