My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX991EUA+
- Part No.:
- MAX991EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX991EUA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:5,804
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX991EUA+ from Maxim Integrated is a dual micropower rail-to-rail input/output comparator with push-pull outputs, operating from +2.5V to +5.5V single supply or ±1.25V to ±2.75V dual supplies, delivering 120ns propagation delay and 48μA per comparator quiescent current - ideal for battery-powered zero-crossing detection and threshold monitoring in portable instrumentation.
For engineers reviewing the MAX991EUA+ datasheet, MAX991EUA+ pinout, MAX991EUA+ application, or MAX991EUA+ equivalent, this page delivers verified electrical parameters, μMAX-8 package mapping, dual-comparator functional context, and real-world design implications for low-voltage, high-speed analog signal conditioning.
Technical Context
The MAX991EUA+ integrates two independent comparators sharing a common VCC and VEE supply domain, each featuring rail-to-rail inputs extending 250mV beyond supply rails and push-pull outputs capable of sourcing/sinking up to 8mA while maintaining rail-to-rail swing. Its internal ±2.5mV hysteresis ensures clean switching with slow-moving signals without external feedback.
Unlike open-drain variants (e.g., MAX992), the MAX991EUA+ eliminates need for external pull-up resistors and supports direct interfacing with CMOS/TTL logic. Its unique output stage minimizes supply-current surges during transitions, reducing power-supply glitches and eliminating mandatory decoupling capacitor overdesign in space-constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V single supply; enables operation in both 3V and 5V systems without level-shifting. |
| Propagation Delay | 120ns at 100mV overdrive (VCC = 5V, CL = 15pF); supports >1MHz signal discrimination in timing-critical circuits. |
| Quiescent Current | 48μA per comparator at VCC = 2.7V; extends battery life in always-on sensor monitoring applications. |
| Input Offset Voltage | ±0.5mV typical (±7mV max over -40°C to +85°C); ensures accurate threshold detection under temperature variation. |
| Input Bias Current | 1.0pA typical; allows high-impedance sensor interfaces (e.g., photodiode, thermistor) without loading error. |
| Output Drive | Sinks/sources 8mA with rail-to-rail swing; directly drives LEDs, MOSFET gates, or logic inputs without buffer stages. |
| Common-Mode Range | Extends 0.25V beyond rails (VEE − 0.25V to VCC + 0.25V); accommodates inputs exceeding supply limits without phase reversal. |
Pinout & Package
MAX991EUA+ is housed in an 8-pin μMAX® package (U8-1 top mark), measuring 3.0mm × 3.0mm × 0.8mm with exposed pad for thermal enhancement. The package is RoHS-compliant and optimized for high-density PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A push-pull output; sinks/source current up to 8mA with rail-to-rail voltage swing. |
| 2 | INA− | Comparator A inverting input; accepts common-mode voltages down to VEE − 0.25V. |
| 3 | INA+ | Comparator A noninverting input; supports over-rail inputs without phase reversal. |
| 4 | VEE | Negative supply terminal (GND in single-supply mode); reference for all inputs and outputs. |
| 5 | VCC | Positive supply terminal; powers both comparators and defines output high-level voltage. |
| 6 | INB+ | Comparator B noninverting input; electrically isolated from INA+ but shares same supply domain. |
| 7 | INB− | Comparator B inverting input; matched offset and bias performance to INA−. |
| 8 | OUTB | Comparator B push-pull output; independently switchable and compatible with OUTA timing specs. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full dynamic range utilization in low-voltage systems (e.g., 2.7V Li-ion powered devices) without signal clipping. |
| 120ns propagation delay | Supports fast edge detection in pulse-width modulation feedback loops and digital line receivers up to ~1MHz. |
| 48μA per comparator | Reduces total system quiescent power by >50% versus legacy comparators, critical for multi-sensor IoT nodes. |
| Internal ±2.5mV hysteresis | Eliminates need for external positive-feedback resistors in noisy environments (e.g., motor control feedback). |
| No phase reversal on overdrive | Guarantees predictable output polarity even when inputs exceed supply rails - essential for ground-sensing applications. |
Applications
| Zero-Crossing Detection | Threshold Monitoring |
|---|---|
|
Use Scenario: Detecting AC waveform polarity transitions in battery-operated energy meters or audio signal processors. IC Role / Device Role / Timing Role: Dual comparator configured as precision zero-cross detector with independent hysteresis per channel. Use Value: 120ns delay enables sub-microsecond timing resolution; rail-to-rail inputs accept ±100mV signals referenced to system ground without level shifters. |
Use Scenario: Monitoring battery voltage against low/high thresholds in portable medical devices to trigger shutdown or alert. IC Role / Device Role / Timing Role: One comparator for under-voltage lockout (UVLO), second for over-voltage protection (OVP) with shared VCC/VEE. Use Value: 48μA quiescent current per comparator minimizes standby drain; ±0.5mV offset ensures <10mV detection accuracy across temperature. |
| Level Translation | Window Comparator |
|
Use Scenario: Converting 5V logic signals to 3.3V-compatible levels in mixed-voltage microcontroller interfaces. IC Role / Device Role / Timing Role: Push-pull output drives 3.3V logic directly; no external pull-up required unlike open-drain alternatives. Use Value: Rail-to-rail output swing guarantees full 0–3.3V logic swing; 8mA drive strength supports fan-out of ≥10 CMOS loads. |
Use Scenario: Validating sensor output (e.g., temperature, pressure) remains within safe operational bounds in industrial controllers. IC Role / Device Role / Timing Role: Two comparators form upper/lower threshold detectors with AND-gated output via external logic. Use Value: Matched input offset (<1mV between channels) ensures tight window symmetry; internal hysteresis prevents chatter near boundaries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX992EUA+ | Dual open-drain comparator; requires external pull-up; output can be pulled to 6V above VEE. | Better suited for level translation between disparate voltage domains (e.g., 5V → 1.8V) where output must exceed VCC. | Select MAX992EUA+ only when interfacing with higher-voltage logic or needing wired-OR functionality. |
| LM393DR | Higher 1.2mA supply current; 1.3μs propagation delay; no rail-to-rail inputs; no internal hysteresis. | Acceptable for cost-sensitive, low-speed applications where power and precision are secondary. | Choose LM393DR only if design tolerates >10× higher quiescent current and >10× slower response than MAX991EUA+. |
Compared with MAX992EUA+, MAX991EUA+ eliminates pull-up components and simplifies layout but lacks output voltage flexibility; versus LM393DR, it delivers 25× lower supply current and 11× faster response - critical for modern ultra-low-power embedded systems.
Availability
MAX991EUA+ is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial threshold monitoring requiring stable component supply and long-term manufacturability.
Supply support for MAX991EUA+ 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 demanding industrial, medical, and communications applications.
The MAX991EUA+ belongs to Maxim's high-speed micropower comparator family, engineered specifically for low-voltage, battery-constrained systems requiring rail-to-rail performance and nanosecond timing fidelity.
FAQ
What is the maximum capacitive load the MAX991EUA+ can drive while maintaining 120ns propagation delay?
The MAX991EUA+ maintains ≤120ns propagation delay for 100mV overdrive with ≤15pF capacitive load at VCC = 5V. At 50pF, delay increases to 20ns; at 200pF, it reaches 40ns. For loads >50pF, consider adding a small series resistor (10–50Ω) near the output to dampen ringing without significantly degrading speed.
Can the MAX991EUA+ operate from a single 2.7V supply with rail-to-rail input signals?
Yes. The MAX991EUA+ supports single 2.7V supply operation with common-mode input range from −0.25V to +2.95V - extending 250mV beyond both rails. This allows direct connection of sensors referenced to ground or VCC without clamping diodes or level shifters.
Does the MAX991EUA+ require external hysteresis for noise immunity in threshold detection?
No. The MAX991EUA+ includes built-in ±2.5mV hysteresis, sufficient for most low-noise applications. External hysteresis is only needed when wider bands (>5mV) are required - achievable via positive feedback resistors per the datasheet Figure 1 circuit.
What is the absolute maximum voltage allowed on the MAX991EUA+ inputs relative to VEE?
Inputs may swing to VEE − 0.3V minimum and VCC + 0.3V maximum. Exceeding these limits risks latch-up or damage. The device's body diodes begin conducting beyond VEE − 0.25V or VCC + 0.25V, increasing input bias current exponentially - stay within the guaranteed common-mode range (VEE to VCC + 0.25V) for specified performance.
How does the MAX991EUA+ reduce power supply noise compared to standard comparators?
The MAX991EUA+ employs a patented output stage that limits supply-current surges during switching - keeping ΔICC < 10μA per transition. This virtually eliminates supply glitches, removing the need for large local decoupling capacitors and preventing crosstalk into adjacent analog or RF sections of the PCB.
MAX991EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 5.5V, ±1.25V ~ 2.75V
- :
- 5mV @ 5.5V
- Voltage - Input Offset (Max):
- 1pA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 96µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 210ns
- Propagation Delay (Max):
- ±2.5mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX991EUA+ FAQ
1.How can I place an order for MAX991EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX991EUA+ 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 MAX991EUA+ reliable?
The price and inventory of MAX991EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX991EUA+ is usually 5 days.
3.What payment methods are accepted for MAX991EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX991EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX991EUA+?
MAX991EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX991EUA+ 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 MAX991EUA+?
For technical support, including MAX991EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX991EUA+ requirements.
6.How does Aetrix verify that MAX991EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX991EUA+ 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 MAX991EUA+ meets industry standards.
7.What is the process for return or replacement of MAX991EUA+?
All MAX991EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX991EUA+, 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 MAX991EUA+ part is unused and in its original packaging.
Return procedure for MAX991EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX991EUA+ Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP USA Inc.
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
