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MAX998EUT+T

Single high-speed comparator, 28ns prop delay, push-pull R-R output, 2.7V-5.5V, SOT-23-6, 5mV hysteresis

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Manufacturer Part：

MAX998EUT+T

Package：

SOT-23-6

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Description

Product Overview

The MAX998EUT+T is a single-channel, high-speed, low-power comparator from Analog Devices (formerly Maxim Integrated). Operating from a single 2.7V to 5.5V supply, it features a push-pull rail-to-rail output with only 28ns propagation delay. Housed in a tiny SOT-23-6 package, it draws just 650µA max supply current while delivering 95dB CMRR and 100dB PSRR, making it ideal for portable and space-constrained comparator applications.

Key Specifications

Type General Purpose Comparator
Number of Comparators 1
Supply Voltage 2.7V to 5.5V
Input Offset Voltage 2mV max @ 5V
Input Bias Current 0.075µA max @ 5.5V
Supply Current 650µA max
CMRR 95dB (typ)
PSRR 100dB (typ)
Propagation Delay 28ns max
Hysteresis 5mV
Output Type Push-Pull, Rail-to-Rail
Package SOT-23-6
Operating Temperature -40°C to +85°C

Features

  • 28ns propagation delay for high-speed applications
  • Rail-to-rail push-pull output — no pull-up resistor needed
  • 2.7V to 5.5V single-supply operation
  • Low input bias current: 75nA max
  • 5mV internal hysteresis prevents output chatter
  • 95dB CMRR and 100dB PSRR for noise rejection
  • Ultra-small SOT-23-6 package

Applications

  • High-speed level detection and threshold comparison
  • Zero-crossing detection in AC line monitoring
  • Battery voltage monitoring and low-battery detection
  • Window comparator circuits
  • IR receiver front-end signal conditioning
  • Sensor signal threshold detection

The MAX998EUT+T is a single-channel, general-purpose comparator from Analog Devices/Maxim Integrated. It operates from a single 2.7V to 5.5V supply and features a push-pull rail-to-rail output that eliminates the need for an external pull-up resistor. With a maximum propagation delay of only 28ns, it responds quickly to input transitions. The internal 5mV hysteresis prevents output oscillation near the switching threshold. The device draws just 650µA maximum supply current, making it suitable for battery-powered applications. High CMRR (95dB) and PSRR (100dB) ensure reliable operation in noisy environments.

The MAX998 compares the voltage at its non-inverting input (IN+) against the inverting input (IN-). When IN+ exceeds IN- by more than the input offset voltage plus hysteresis, the output drives to the positive rail. When IN- exceeds IN+ by the same margin, the output drives to the negative rail (ground). The push-pull output stage actively drives both high and low states, unlike open-drain comparators that require an external pull-up resistor. The 5mV internal hysteresis creates a small voltage window around the switching threshold, preventing multiple output transitions when the input signal is slow or noisy.

Pin Name Description
1 OUT Push-pull rail-to-rail output
2 VSS (GND) Ground / negative supply
3 IN+ Non-inverting input
4 IN- Inverting input
5 VCC Positive supply (2.7V to 5.5V)
6 NC No connect
  • Low-Battery Detection: Connect IN- to a reference voltage derived from VCC via resistor divider, and IN+ to the battery voltage. When battery drops below threshold, the output transitions low, triggering a low-battery indicator or shutdown sequence. The push-pull output directly drives an LED or MCU GPIO without a pull-up resistor.
  • Zero-Crossing Detection: For AC line monitoring, connect IN+ to the rectified AC signal through a current-limiting resistor and IN- to ground. The 28ns propagation delay enables precise zero-cross timing for TRIAC dimming or relay control applications.
  • Window Comparator: Use two MAX998 devices with different reference thresholds to create a window comparator. The outputs feed an AND gate to indicate when the input signal is within the acceptable voltage range, useful for power supply monitoring and fault detection.
Model Channels Prop Delay Supply Key Difference
MAX997EUT+T 1 40ns 2.7-5.5V Open-drain output variant
MAX9031AUK+T 1 40ns 2.7-5.5V Includes 1.236V reference
TS861ILT 1 28ns 2.7-10V ST alternative, wider supply
TLV3201AIDBVR 1 40ns 2.7-5.5V TI alternative with push-pull output
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