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Home > Products > Integrated Circuits (ICs) > Linear > Comparators

Analog Devices Inc./Maxim Integrated MAX9108EUD+

Name: MAX9108EUD+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX9108EUD+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX9108EUD+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Comparators

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: MAX9108EUD+.pdf

Description:: IC COMPARATOR 4 GEN PUR 14TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX9108EUD+ from Maxim Integrated is a quad high-speed, low-power voltage comparator optimized for single +5V systems. It delivers 25ns propagation delay with 10mV input overdrive, consumes only 350µA per comparator (1.75mW), and supports input common-mode range from −200mV to V_CC−1.5V. It drives TTL loads directly without pullups and is used in threshold detection, line receivers, and A/D converter front-ends.

For engineers reviewing the MAX9108EUD+ datasheet, MAX9108EUD+ pinout, MAX9108EUD+ application, or MAX9108EUD+ equivalent, key selection considerations include propagation delay skew (≤1ns), internal 2mV hysteresis for noise immunity, latch-free quad architecture, and TSSOP-14 package compatibility with space-constrained industrial signal conditioning designs.

Technical Context

The MAX9108EUD+ implements four independent bipolar comparators with matched propagation delays and differential skew ≤1ns. Each channel features rail-to-rail input capability down to −200mV and TTL-compatible outputs with VOH ≥3.0V at 100µA and VOL ≤0.6V at 3.2mA.

It integrates fixed 2mV internal hysteresis to suppress oscillation during slow input transitions, eliminating external feedback resistors. No latch function is present-unlike the MAX9109-making it suitable for real-time, non-latched decision circuits requiring deterministic timing across all four channels.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	25ns at 10mV overdrive - enables sampling of >30MHz analog events with precise timing alignment.
Supply Current per Comparator	350µA (1.75mW @ 5V) - supports battery-powered or thermally constrained multi-channel monitoring.
Input Common-Mode Range	−0.2V to V_CC−1.5V - accepts ground-referenced or negative-biased inputs without level-shifting.
Input Offset Voltage	4.0mV max (−40°C to +85°C) - ensures reliable threshold detection within ±2mV window under full temperature range.
Hysteresis	2mV typical - provides built-in noise margin against EMI or signal bounce in noisy industrial environments.
Output Drive	TTL-compatible, no pullup required - simplifies PCB layout and reduces BOM count in digital interface stages.
Operating Supply	4.5V to 5.5V - compatible with standard 5V logic rails and regulated LDO outputs.

Pinout & Package

The MAX9108EUD+ is housed in a 14-pin TSSOP package (package code U14-1), 5.0mm × 4.4mm footprint, 0.65mm pitch, with exposed pad for thermal enhancement. Pin 1 is marked by a dot or notch.

Pin/Terminal	Circuit Role	Design Meaning
1	OUTD	Channel D output - active-high TTL-compatible signal; sinks up to 8mA or sources 100µA.
2	IND−	Channel D inverting input - accepts reference or feedback voltage; supports common-mode down to −0.2V.
3	IND+	Channel D noninverting input - primary signal sensing node; matched offset and bias current with other channels.
4	GND	Analog/digital ground reference - must connect to low-impedance ground plane to maintain 25ns timing integrity.
5	VCC	Positive supply - requires local 0.1µF ceramic decoupling placed ≤2mm from pin for stable high-speed operation.
6	INA+	Channel A noninverting input - identical electrical characteristics to pins 3, 9, and 12; enables synchronized multi-threshold detection.
7	INA−	Channel A inverting input - paired with pin 6; differential input stage rejects common-mode noise up to 1000μV/V.
8	OUTA	Channel A output - electrically identical to pins 1, 10, and 13; supports fan-out to ≥10 TTL loads.
9	INC+	Channel C noninverting input - shares same input bias current (125–350nA) and offset specs as all channels.
10	INC−	Channel C inverting input - enables independent threshold setting per channel without cross-talk.
11	OUTC	Channel C output - matches propagation delay (25ns) and skew (≤1ns) with other outputs for time-aligned decisions.
12	INB+	Channel B noninverting input - supports simultaneous 4-channel comparison with <5ns inter-channel skew.
13	INB−	Channel B inverting input - fully specified for −40°C to +85°C; no derating needed in industrial ambient.
14	OUTB	Channel B output - TTL output stage designed for direct connection to FPGA I/O banks or microcontroller interrupt pins.

Key Features

Feature	Design Value
25ns propagation delay	Enables real-time response to fast transients in motor control feedback or data acquisition trigger paths.
2mV internal hysteresis	Eliminates need for external resistor networks, reducing layout complexity and improving repeatability in production.
−0.2V to V_CC−1.5V input range	Accepts signals below ground (e.g., op-amp outputs, sensor offsets) without external level shifters.
TTL-compatible outputs	Direct interface to 5V logic families without pull-up resistors or level translators - saves board space and power.
Quad independent channels	Supports parallel thresholding (e.g., overvoltage/undervoltage/warning/fault) with matched timing behavior.

Applications

Threshold Detectors	Line Receivers
Use Scenario: Monitoring multiple DC rail voltages (e.g., 3.3V, 2.5V, 1.8V, 1.2V) in an industrial PLC backplane. IC Role / Device Role / Timing Role: Quad comparator simultaneously compares each rail against precision references; outputs drive status LEDs or MCU GPIOs. Use Value: 25ns response ensures fault detection before downstream damage occurs; 2mV hysteresis prevents chatter on noisy supply lines.	Use Scenario: Receiving RS-422/RS-485 differential signals in factory automation gateways. IC Role / Device Role / Timing Role: Converts differential line signals to single-ended TTL logic for FPGA preprocessing; four channels handle multiple bus segments. Use Value: Wide input common-mode range accommodates ground potential differences between nodes; TTL outputs interface directly to FPGA I/O banks.
A/D Converter Front-Ends	Zero-Crossing Detectors
Use Scenario: Driving sample-and-hold enable in a 12-bit SAR ADC used in power quality analyzers. IC Role / Device Role / Timing Role: Compares analog input against programmable thresholds to generate precise sampling strobes synchronized to signal edges. Use Value: Low 350µA per channel minimizes loading on sensor amplifiers; matched propagation delays ensure consistent sampling timing across channels.	Use Scenario: Detecting AC line zero-crossings for phase-controlled dimmers in smart lighting systems. IC Role / Device Role / Timing Role: Compares sinusoidal AC waveform against 0V reference; output triggers TRIAC firing logic with minimal jitter. Use Value: −0.2V input capability allows direct connection to center-tapped transformers; 25ns delay enables sub-1µs timing accuracy at 50/60Hz.

Threshold Detectors

Line Receivers

Use Scenario: Monitoring multiple DC rail voltages (e.g., 3.3V, 2.5V, 1.8V, 1.2V) in an industrial PLC backplane.

IC Role / Device Role / Timing Role: Quad comparator simultaneously compares each rail against precision references; outputs drive status LEDs or MCU GPIOs.

Use Value: 25ns response ensures fault detection before downstream damage occurs; 2mV hysteresis prevents chatter on noisy supply lines.

Use Scenario: Receiving RS-422/RS-485 differential signals in factory automation gateways.

IC Role / Device Role / Timing Role: Converts differential line signals to single-ended TTL logic for FPGA preprocessing; four channels handle multiple bus segments.

Use Value: Wide input common-mode range accommodates ground potential differences between nodes; TTL outputs interface directly to FPGA I/O banks.

A/D Converter Front-Ends

Zero-Crossing Detectors

Use Scenario: Driving sample-and-hold enable in a 12-bit SAR ADC used in power quality analyzers.

IC Role / Device Role / Timing Role: Compares analog input against programmable thresholds to generate precise sampling strobes synchronized to signal edges.

Use Value: Low 350µA per channel minimizes loading on sensor amplifiers; matched propagation delays ensure consistent sampling timing across channels.

Use Scenario: Detecting AC line zero-crossings for phase-controlled dimmers in smart lighting systems.

IC Role / Device Role / Timing Role: Compares sinusoidal AC waveform against 0V reference; output triggers TRIAC firing logic with minimal jitter.

Use Value: −0.2V input capability allows direct connection to center-tapped transformers; 25ns delay enables sub-1µs timing accuracy at 50/60Hz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM339DR	Slower (1.3µs typ), higher supply current (500µA/comparator), no internal hysteresis, open-collector outputs require pullups.	Suitable for low-speed, cost-sensitive industrial controls where timing precision is not critical.	Select LM339DR only when 25ns speed and TTL drive are unnecessary and BOM cost dominates design priorities.
TLV3704IPW	Rail-to-rail input (0V to V_CC), lower supply current (80µA/comparator), but slower (600ns), no internal hysteresis, push-pull outputs.	Better for ultra-low-power battery devices with relaxed timing, but requires external hysteresis network for noise immunity.	Choose TLV3704IPW for portable equipment needing <1mA total quiescent current; avoid where 25ns response or built-in hysteresis is mandatory.

Compared with LM339DR and TLV3704IPW, the MAX9108EUD+ uniquely combines 25ns speed, integrated 2mV hysteresis, and TTL-compatible outputs in a quad configuration-enabling compact, deterministic, noise-immune threshold detection without design compromises.

Availability

MAX9108EUD+ is available at Aetrix Electronics and suitable for industrial automation, test equipment, and power management systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for MAX9108EUD+ 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 industrial, automotive, and communications applications.

The MAX9107/MAX9108/MAX9109 family was engineered to replace legacy comparators with higher speed, lower power, and integrated hysteresis-targeting real-time signal conditioning in space- and power-constrained systems.

FAQ

What is the maximum operating temperature range for the MAX9108EUD+?

The MAX9108EUD+ is fully specified and guaranteed over the industrial temperature range of −40°C to +85°C. All electrical parameters-including propagation delay, input offset voltage, and hysteresis-are tested and validated across this range. The device uses a bipolar process and TSSOP package qualified for continuous operation at +85°C ambient, with derating applied above +70°C per its 9.1mW/°C thermal coefficient.

Does the MAX9108EUD+ include an internal latch function like the MAX9109?

No, the MAX9108EUD+ does not include an internal latch. Unlike the MAX9109-which features a dedicated LE (latch enable) pin-the MAX9108EUD+ implements four independent, transparent comparators with no storage element. Its outputs respond immediately to input changes with 25ns delay, making it appropriate for real-time decision circuits rather than sampled-data hold applications.

Can the MAX9108EUD+ operate from a 3.3V supply?

No, the MAX9108EUD+ is specified only for 4.5V to 5.5V operation. Its TTL-compatible outputs require ≥3.0V VOH at 100µA load, and internal circuitry is optimized for 5V rail performance. Attempting 3.3V operation results in undefined output levels, degraded propagation delay, and possible failure to meet datasheet limits. For 3.3V systems, consider alternatives such as the MAX9021 or TLV3704.

What is the input bias current specification for the MAX9108EUD+?

The MAX9108EUD+ has an input bias current of 125nA (typical) to 350nA (maximum) across the full −40°C to +85°C temperature range. This low bias current minimizes voltage errors when driving high-impedance sources (e.g., resistor dividers or capacitive sensors), supporting accurate threshold detection without significant loading effects on sensitive analog nodes.

Is the MAX9108EUD+ pin-compatible with other packages of the same part number?

Yes, the MAX9108EUD+ (14-pin TSSOP) shares identical pinout and functionality with the MAX9108ESD+ (14-pin SO). Both variants use the same pin numbering, signal assignments, and electrical specifications. However, the TSSOP package offers superior thermal performance and smaller footprint-critical for high-density layouts-while the SO version provides easier hand-soldering and prototyping flexibility.

MAX9108EUD+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Series:: -

Packaging:: Tube

Product Status:: Active

Type:: General Purpose

Number of Elements:: 4

Output Type:: TTL

Voltage - Supply, Single/Dual (±):: 4.5V ~ 5.5V

:: 1.6mV @ 5V

Voltage - Input Offset (Max):: 0.125µA @ 5V

Current - Input Bias (Max):: -

Current - Output (Typ):: 700µA

Current - Quiescent (Max):: 86.02dB CMRR, 86.02dB PSRR

CMRR, PSRR (Typ):: 25ns

Propagation Delay (Max):: 2mV

Hysteresis:: -40°C ~ 85°C

Operating Temperature:: -

Grade:: -

Qualification:: Surface Mount

:: 14-TSSOP

MAX9108EUD+ FAQ

1.How can I place an order for MAX9108EUD+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX9108EUD+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX9108EUD+ reliable?

The price and inventory of MAX9108EUD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9108EUD+ is usually 5 days.

3.What payment methods are accepted for MAX9108EUD+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9108EUD+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX9108EUD+?

MAX9108EUD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX9108EUD+ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX9108EUD+?

For technical support, including MAX9108EUD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9108EUD+ requirements.

6.How does Aetrix verify that MAX9108EUD+ is sourced from the original manufacturer or authorized distributors?

All MAX9108EUD+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX9108EUD+ meets industry standards.

7.What is the process for return or replacement of MAX9108EUD+?

All MAX9108EUD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9108EUD+, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX9108EUD+ part is unused and in its original packaging.

Return procedure for MAX9108EUD+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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