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

Analog Devices Inc./Maxim Integrated MAX9108EUD+T

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

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Part No.:: MAX9108EUD+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Comparators

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

Datasheet:: MAX9108EUD+T.pdf

Description:: IC COMPARATOR 4 GEN PUR 14TSSOP

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Product details

Overview

MAX9108EUD+T from Maxim Integrated is a quad, high-speed, low-power TTL-compatible voltage comparator operating from a single +5V supply. 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 - enabling ground-sensing in battery-powered threshold detection circuits.

For engineers reviewing the MAX9108EUD+T datasheet, MAX9108EUD+T pinout, MAX9108EUD+T application, or MAX9108EUD+T equivalent, this device is selected for high-speed analog-to-digital interface conditioning, line receiver signal discrimination, and zero-crossing detection where low power, clean TTL output switching, and internal hysteresis are required.

Technical Context

The MAX9108EUD+T implements four independent comparators in a single monolithic bipolar process, each featuring internally trimmed 2mV hysteresis to suppress oscillation during slow input transitions. Its TTL-compatible outputs drive standard logic loads without external pull-ups, and its input stage accepts signals down to −200mV relative to GND while maintaining guaranteed operation up to V_CC−1.5V.

Designed as a drop-in upgrade to legacy MAX908, it achieves lower propagation delay skew (≤1ns differential, ≤5ns t_PDskew) and tighter offset voltage (4.0mV max over temperature) while maintaining identical functional pinout across SO and TSSOP packages. No latch function is present - unlike the MAX9109 - confirming pure comparator-only operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay	25ns at 10mV overdrive - enables sampling of ≥30MHz analog edges in A/D front-ends.
Supply Current per Comparator	350µA typical at V_CC = 5.5V - supports ultra-low-power battery operation in portable instruments.
Input Offset Voltage	4.0mV max over −40°C to +85°C - ensures stable trip-point accuracy in precision threshold detectors.
Input Common-Mode Range	−0.2V to V_CC−1.5V - allows direct sensing of signals referenced below ground (e.g., transducer outputs).
Output Compatibility	TTL logic levels: VOH ≥ 3.0V @ 100µA, VOL ≤ 0.6V @ 3.2mA - interfaces directly with 74LS/74F logic families.
Internal Hysteresis	2mV input-referred - eliminates need for external feedback resistors and prevents chatter on noisy inputs.
Operating Supply Range	4.5V to 5.5V - compatible with regulated +5V rails and tolerates ±5% variation without performance loss.

Pinout & Package

MAX9108EUD+T 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 marked via top-side dot.

Pin/Terminal	Circuit Role	Design Meaning
1	OUTD	Comparator D output - active-high TTL-compatible signal, sinks 3.2mA min.
2	IND−	Inverting input for comparator D - accepts voltages from −0.2V to V_CC−1.5V.
3	IND+	Noninverting input for comparator D - same common-mode range as IND−.
4	GND	Analog/digital ground reference - must connect to low-inductance PCB ground plane.
5	V_CC	Positive supply input - requires local 0.1µF ceramic decoupling capacitor placed adjacent to pin.
6	INA+	Noninverting input for comparator A - electrically identical to IND+.
7	INA−	Inverting input for comparator A - matches full input voltage range specification.
8	OUTA	Comparator A output - fully interchangeable with OUTD in layout and loading.
9	INC+	Noninverting input for comparator C - shares same bias current (125–350nA) and offset specs.
10	INC−	Inverting input for comparator C - no internal connection to other channels; independent operation.
11	OUTC	Comparator C output - identical timing and drive strength to OUTA/OUTD.
12	INB−	Inverting input for comparator B - validated for −40°C to +85°C operation with 500µV typical offset.
13	INB+	Noninverting input for comparator B - supports rail-to-rail input swing within specified VCMR.
14	OUTB	Comparator B output - TTL-compatible, no latch enable (LE pin absent in MAX9108).

Key Features

Feature	Design Value
25ns propagation delay	Enables real-time edge detection in high-frequency sampling circuits without added latency compensation.
350µA per comparator supply current	Reduces total quiescent draw to 1.4mA for all four channels - critical for multi-channel portable data loggers.
−200mV to V_CC−1.5V input range	Eliminates level-shifting circuitry when interfacing with sensors or op-amps operating below ground.
2mV internal hysteresis	Guarantees bounce-free output transitions on slowly varying or noisy inputs - no external components needed.
TTL-compatible outputs	Directly drives 74LS, 74F, and microcontroller GPIOs without pull-up resistors or level translators.

Applications

Battery-Powered Threshold Detection	A/D Converter Input Conditioning
Use Scenario: Detecting low-voltage battery depletion in handheld medical devices using a resistive divider feeding into a comparator. IC Role / Device Role / Timing Role: Quad comparator providing four independent low-battery warning thresholds with simultaneous status reporting. Use Value: 350µA per channel enables >1-year standby life on coin-cell batteries while maintaining precise 2.7V/2.8V/2.9V/3.0V trip points.	Use Scenario: Converting analog sensor outputs (e.g., thermistor, strain gauge) into clean digital pulses before ADC sampling. IC Role / Device Role / Timing Role: High-speed comparator acting as a synchronous window detector ahead of SAR or sigma-delta ADCs. Use Value: 25ns delay ensures accurate timing alignment between analog event and digital capture clock, minimizing aperture jitter.
Line Receiver Signal Discrimination	Zero-Crossing Detection
Use Scenario: Recovering digital data from attenuated RS-422 or LVDS-like differential lines in industrial control backplanes. IC Role / Device Role / Timing Role: Single comparator channel used differentially (IN+, IN−) to reject common-mode noise on long traces. Use Value: 2mV hysteresis rejects EMI-induced false triggers while −200mV input range accommodates undershoot on fast edges.	Use Scenario: Generating precise timing edges from AC mains or transformer-coupled sine waves in power inverters. IC Role / Device Role / Timing Role: Comparator comparing AC waveform against 0V reference to produce synchronized square-wave clock. Use Value: Input range extending 200mV below GND prevents clipping during negative half-cycle undershoot, ensuring symmetrical output duty cycle.

Battery-Powered Threshold Detection

A/D Converter Input Conditioning

Use Scenario: Detecting low-voltage battery depletion in handheld medical devices using a resistive divider feeding into a comparator.

IC Role / Device Role / Timing Role: Quad comparator providing four independent low-battery warning thresholds with simultaneous status reporting.

Use Value: 350µA per channel enables >1-year standby life on coin-cell batteries while maintaining precise 2.7V/2.8V/2.9V/3.0V trip points.

Use Scenario: Converting analog sensor outputs (e.g., thermistor, strain gauge) into clean digital pulses before ADC sampling.

IC Role / Device Role / Timing Role: High-speed comparator acting as a synchronous window detector ahead of SAR or sigma-delta ADCs.

Use Value: 25ns delay ensures accurate timing alignment between analog event and digital capture clock, minimizing aperture jitter.

Line Receiver Signal Discrimination

Zero-Crossing Detection

Use Scenario: Recovering digital data from attenuated RS-422 or LVDS-like differential lines in industrial control backplanes.

IC Role / Device Role / Timing Role: Single comparator channel used differentially (IN+, IN−) to reject common-mode noise on long traces.

Use Value: 2mV hysteresis rejects EMI-induced false triggers while −200mV input range accommodates undershoot on fast edges.

Use Scenario: Generating precise timing edges from AC mains or transformer-coupled sine waves in power inverters.

IC Role / Device Role / Timing Role: Comparator comparing AC waveform against 0V reference to produce synchronized square-wave clock.

Use Value: Input range extending 200mV below GND prevents clipping during negative half-cycle undershoot, ensuring symmetrical output duty cycle.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM339DR	Slower (1.3µs typ), higher supply current (500µA/channel), open-collector outputs requiring pull-ups.	Lacks internal hysteresis and TTL compatibility - needs external components for same functionality.	Choose LM339DR only if cost is primary constraint and speed/power/hysteresis are non-critical.
TLV3501CDR	Faster (4.5ns), rail-to-rail input, CMOS output - but requires external hysteresis and operates from 2.7–5.5V.	Higher speed suits RF sampling; lacks integrated hysteresis and true TTL drive capability.	Choose TLV3501CDR when sub-10ns response is mandatory and system can accommodate design overhead for hysteresis and level translation.

Compared with LM339DR and TLV3501CDR, the MAX9108EUD+T uniquely combines 25ns speed, 350µA efficiency, built-in 2mV hysteresis, and true TTL output drive in a single +5V solution - reducing BOM count and layout complexity for industrial and portable designs.

Availability

MAX9108EUD+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, A/D converter front-ends, line receiver signal conditioning, and zero-crossing detection requiring stable component supply across extended temperature ranges.

Supply support for MAX9108EUD+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 is a semiconductor company specializing in analog and mixed-signal ICs for industrial, communications, computing, and consumer applications.

The MAX9108EUD+T belongs to Maxim's high-speed comparator product line, engineered for precision timing-critical systems where low power, fast response, and robust noise immunity are essential - particularly in portable and sensor-interface applications.

FAQ

What is the maximum operating temperature for MAX9108EUD+T?

The MAX9108EUD+T is fully specified and guaranteed over an operating temperature range of −40°C to +85°C. All electrical parameters - including propagation delay, input offset voltage, and supply current - are tested and validated across this full industrial temperature range, making MAX9108EUD+T suitable for deployment in harsh environments such as factory automation and outdoor instrumentation.

Does MAX9108EUD+T include an internal latch function?

No, the MAX9108EUD+T does not include an internal latch. The latch feature is exclusive to the MAX9109 variant (e.g., MAX9109EXT+T). The MAX9108EUD+T provides four independent, transparent comparators with no latch-enable (LE) pin or storage capability - ensuring immediate output response to input changes without hold-time constraints.

Can MAX9108EUD+T operate from a 3.3V supply?

No, the MAX9108EUD+T is designed exclusively for single-supply operation between 4.5V and 5.5V. It does not guarantee functionality or parameter compliance at 3.3V. For 3.3V systems, consider alternatives such as the MAX9021 or TLV3501, which are explicitly rated for lower supply voltages and maintain comparable speed and precision.

What is the purpose of the internal 2mV hysteresis in MAX9108EUD+T?

The internal 2mV hysteresis in MAX9108EUD+T prevents output oscillation when input signals transition slowly or contain noise near the trip point. It creates two distinct thresholds - one for rising inputs (VTRIP+) and one for falling inputs (VTRIP−) - with their difference equaling 2mV. This eliminates the need for external positive-feedback resistors and ensures clean, chatter-free TTL output transitions in real-world signal-conditioning applications.

Is MAX9108EUD+T pin-compatible with the older MAX908?

Yes, the MAX9108EUD+T is a direct functional and pin-compatible upgrade to the MAX908 in both 14-pin SO and 14-pin TSSOP packages. It retains identical pin assignments, supply requirements, and output behavior while improving propagation delay (25ns vs. 50ns), reducing supply current (350µA vs. 1.2mA per comparator), and adding internal hysteresis - enabling drop-in replacement without PCB modification.

MAX9108EUD+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

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

Series:: -

Packaging:: Tape & Reel (TR)

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+T FAQ

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

Please submit a Request for Quotation (RFQ) for MAX9108EUD+T 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+T reliable?

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

3.What payment methods are accepted for MAX9108EUD+T?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX9108EUD+T?

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

Once your MAX9108EUD+T 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+T?

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

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

All MAX9108EUD+T 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+T meets industry standards.

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

All MAX9108EUD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9108EUD+T, 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+T part is unused and in its original packaging.

Return procedure for MAX9108EUD+T:

1.Submit a request within 90 days.

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

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