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Analog Devices Inc./Maxim Integrated MAX991ESA+
- Part No.:
- MAX991ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX991ESA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:194
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Product details
Overview
MAX991ESA+ 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. It delivers 120ns propagation delay, 48μA per comparator quiescent current, and ±0.5mV typical input offset voltage. It is used in battery-powered zero-crossing detectors and threshold discriminators where low power and fast response are critical.
For engineers reviewing the MAX991ESA+ datasheet, MAX991ESA+ pinout, MAX991ESA+ application, or MAX991ESA+ equivalent, key selection criteria include its dual-channel push-pull output architecture, rail-to-rail common-mode range extending 250mV beyond rails, guaranteed operation over –40°C to +85°C, and compatibility with 3V/5V systems requiring clean switching without supply glitches.
Technical Context
The MAX991ESA+ integrates two independent comparators sharing a common supply domain, each featuring internal hysteresis (±2.5mV) to prevent chatter on slow-moving inputs. Its input stage supports common-mode voltages from VEE – 0.25V to VCC + 0.25V, enabling direct sensing of signals near or slightly beyond supply rails.
The push-pull output stage sources and sinks up to 8mA while maintaining rail-to-rail swing - VOL ≤ 0.4V at 8mA sink (VCC = 5V), VOH ≥ 4.6V at 8mA source (VCC = 5V). Supply-current surges during switching are minimized by unique output circuitry, reducing supply-line transients that would otherwise require large decoupling capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V single supply; enables direct use in 3V and 5V systems without level-shifting. |
| Propagation Delay | 120ns at 100mV overdrive (VCC = 5V, CL = 15pF); ensures timing-critical decisions in high-speed monitoring. |
| Quiescent Current | 48μA per comparator (TYP at VCC = 2.7V); extends battery life in portable instrumentation and sensor nodes. |
| Input Offset Voltage | ±0.5mV (TYP); supports accurate threshold detection down to sub-millivolt levels without external trimming. |
| Common-Mode Range | VEE – 0.25V to VCC + 0.25V; allows direct interface to sensors or signals exceeding supply rails by 250mV. |
| Output Drive | Sinks/sources 8mA with rail-to-rail swing; drives LEDs, logic inputs, or small MOSFET gates directly. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and automotive cabin applications without derating. |
Pinout & Package
MAX991ESA+ is housed in an 8-pin SO (Small Outline) package (package code S8-2), with exposed pad not electrically connected. The package measures 4.9mm × 6.0mm × 1.75mm and is RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A push-pull output; actively drives high/low - no external pullup required. |
| 2 | VCC | Positive supply input; accepts +2.5V to +5.5V; must be decoupled with 0.1µF ceramic capacitor. |
| 3 | INA− | Inverting input for Comparator A; supports common-mode range beyond rails by ±0.25V. |
| 4 | INA+ | Noninverting input for Comparator A; matched bias current (<10pA TYP) minimizes offset error. |
| 5 | VEE | Negative supply (GND in single-supply mode); reference for all inputs and outputs. |
| 6 | INB+ | Noninverting input for Comparator B; electrically isolated from INA+ but shares same VCC/VEE. |
| 7 | INB− | Inverting input for Comparator B; identical electrical specs to INA−, enabling matched dual thresholds. |
| 8 | OUTB | Comparator B push-pull output; independently controllable; compatible with 3.3V/5V logic families. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O with extended common-mode range | Inputs operate from VEE – 0.25V to VCC + 0.25V; outputs swing within 0.4V of rails at 8mA load - eliminates need for external level shifters. |
| Ultra-low quiescent current | 48μA per comparator at 2.7V enables >1-year operation on coin-cell batteries in wake-on-event sensor monitors. |
| Internal hysteresis | ±2.5mV built-in hysteresis prevents oscillation on noisy or slowly varying inputs - no external components needed for stable thresholding. |
| Glitch-free switching | Unique output stage limits supply-current transients during state transitions - reduces PCB-level noise coupling and eases EMI compliance. |
| Push-pull output architecture | Eliminates external pullup resistors; supports direct drive of CMOS/TTL loads and bidirectional signaling in window comparator topologies. |
Applications
| Portable Battery Monitoring | Industrial Threshold Detection |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging in handheld medical devices. IC Role / Device Role / Timing Role: Dual comparator implements under-voltage lockout (UVO) and over-voltage protection (OVP) with independent trip points. Use Value: 48μA total quiescent current preserves standby battery life; rail-to-rail inputs accurately sense 0–4.2V cell range without signal conditioning. |
Use Scenario: Detecting pressure switch closure and temperature fault thresholds in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: One comparator monitors analog sensor output against fixed reference; second validates auxiliary safety interlock. Use Value: –40°C to +85°C rating ensures reliability across factory environments; ±0.5mV offset enables <10mV threshold accuracy without calibration. |
| Zero-Crossing Detection | Logic-Level Translation |
|
Use Scenario: AC line synchronization in energy metering ICs and TRIAC dimmer control circuits. IC Role / Device Role / Timing Role: Comparator A detects sine-wave crossing through 0V; Comparator B provides complementary output for phase control. Use Value: 120ns propagation delay ensures sub-degree timing resolution at 50/60Hz; internal hysteresis rejects noise-induced false triggers. |
Use Scenario: Interfacing 5V microcontroller GPIO to 3.3V ADC reference enable lines in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Push-pull output drives 3.3V logic high/low directly - no level shifter IC or resistor network required. Use Value: Rail-to-rail VOH/VOL guarantees full logic swing compatibility; 8mA drive strength supports fan-out to multiple 3.3V inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Higher 1.5mA supply current per comparator; slower 1.3μs propagation delay; open-drain only; no rail-to-rail inputs. | Requires external pullup; unsuitable for battery-powered designs or rail-sensing; limited to 36V max supply. | Select LM393DR only when cost is primary constraint and speed/power are non-critical. |
| TLV3702IDR | Lower 8μA quiescent current; 350ns propagation delay; rail-to-rail inputs/outputs; same SO-8 package. | Better power efficiency but slower response; lower drive strength (400μA) limits direct logic interfacing. | Choose TLV3702IDR for ultra-low-power sensor wake-up circuits where 350ns latency is acceptable. |
Compared with MAX991ESA+, LM393DR trades speed and rail-to-rail capability for legacy compatibility and lower unit cost, while TLV3702IDR prioritizes microamp-level quiescent current at the expense of propagation delay and output drive - making MAX991ESA+ optimal for applications needing balanced speed, power, and drive strength in industrial and portable systems.
Availability
MAX991ESA+ is available at Aetrix Electronics and suitable for portable battery monitoring, industrial threshold detection, zero-crossing detection, and logic-level translation requiring stable component supply across production lifecycles.
Supply support for MAX991ESA+ 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, medical, communications, and consumer applications, with emphasis on power efficiency and signal integrity.
The MAX991ESA+ belongs to Maxim's high-speed micropower comparator family, engineered specifically for low-voltage, battery-constrained systems requiring fast, accurate, and glitch-immune decision-making at the signal edge.
FAQ
What is the maximum capacitive load the MAX991ESA+ can drive while maintaining 120ns propagation delay?
The MAX991ESA+ maintains ≤120ns propagation delay (at 100mV overdrive, VCC = 5V) for capacitive loads up to 15pF. At 50pF, delay increases to 20ns; at 200pF, it reaches 40ns. For loads >50pF, consider adding a buffer stage or reducing overdrive to preserve timing margins in the MAX991ESA+ design.
Does the MAX991ESA+ support dual-supply operation, and what are the valid voltage ranges?
Yes, the MAX991ESA+ supports dual-supply operation with VCC and VEE pins. Valid ranges are ±1.25V to ±2.75V (i.e., VCC = +1.25V to +2.75V, VEE = –1.25V to –2.75V), maintaining full rail-to-rail input/output performance and 120ns propagation delay. Total supply voltage (VCC – VEE) must not exceed 6V.
Can the MAX991ESA+ inputs safely handle voltages beyond the supply rails, and by how much?
Yes - the MAX991ESA+ inputs tolerate voltages from VEE – 0.25V to VCC + 0.25V, verified across –40°C to +85°C. This ±250mV rail extension enables direct connection to sensors or signals that transiently exceed VCC or drop below VEE without phase reversal or damage, as confirmed in the MAX991ESA+ absolute maximum ratings.
Is the MAX991ESA+ pin-compatible with other devices in the MAX99x family, such as MAX992ESA+?
No - MAX991ESA+ (push-pull output) and MAX992ESA+ (open-drain output) share identical SO-8 pinout and footprint, but their output stages differ electrically. Swapping them requires circuit review: MAX992ESA+ needs an external pullup resistor, while MAX991ESA+ does not. The MAX991ESA+ pin configuration is not compatible with MAX987/MAX988 (SC70-5) or MAX995/MAX996 (TSSOP-14).
What is the typical input bias current of the MAX991ESA+, and how does it affect high-impedance sensor interfaces?
The MAX991ESA+ exhibits a typical input bias current of 1.0pA (at TA = +25°C), with maximum 10nA across –40°C to +85°C. This ultra-low bias current minimizes voltage error across high-value source impedances (e.g., 10MΩ thermistor networks), preserving measurement accuracy without active guarding or compensation - a key advantage in precision MAX991ESA+ sensor front-ends.
MAX991ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
MAX991ESA+ FAQ
1.How can I place an order for MAX991ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX991ESA+ 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 MAX991ESA+ reliable?
The price and inventory of MAX991ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX991ESA+ is usually 5 days.
3.What payment methods are accepted for MAX991ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX991ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX991ESA+?
MAX991ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX991ESA+ 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 MAX991ESA+?
For technical support, including MAX991ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX991ESA+ requirements.
6.How does Aetrix verify that MAX991ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX991ESA+ 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 MAX991ESA+ meets industry standards.
7.What is the process for return or replacement of MAX991ESA+?
All MAX991ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX991ESA+, 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 MAX991ESA+ part is unused and in its original packaging.
Return procedure for MAX991ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX991ESA+ Tags
-
LM2903DR
Texas Instruments
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LM339DR
Texas Instruments
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LM339PWR
Texas Instruments
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LM393DT
STMicroelectronics
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LM2901PWR
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LM2903DT
STMicroelectronics
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LM393DR
Texas Instruments
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LM239DR
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LM339APWR
Texas Instruments
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LM2903P
Texas Instruments
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LM393ADR
Texas Instruments
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NCX2200GMAZ
NXP USA Inc.
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