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Analog Devices Inc./Maxim Integrated MAX991EKA+T
- Part No.:
- MAX991EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-8
- Datasheet:
-
MAX991EKA+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,191
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Product details
Overview
MAX991EKA+T from Maxim Integrated is a dual micropower comparator with rail-to-rail inputs and outputs, push-pull output stage, 120ns propagation delay, 48μA per comparator quiescent current, and operation from +2.5V to +5.5V single supply - used in battery-powered threshold detection and zero-crossing circuits.
For engineers reviewing the MAX991EKA+T datasheet, MAX991EKA+T pinout, MAX991EKA+T application, or MAX991EKA+T equivalent, this page delivers verified technical context, package mapping, real-world design meaning of key specs, and validated alternative options for low-voltage, high-speed comparator selection.
Technical Context
The MAX991EKA+T integrates two independent comparators sharing a common supply (VCC/VEE), each featuring rail-to-rail input voltage range extending 250mV beyond both rails and internal ±2.5mV hysteresis to prevent chatter on slow-moving signals. Its push-pull output stage sources and sinks up to 8mA while maintaining rail-to-rail swing.
Unlike open-drain variants (e.g., MAX992), the MAX991EKA+T eliminates external pull-up requirements and supports direct interfacing with CMOS/TTL logic. Its unique output architecture minimizes supply-current surges during switching, reducing power-supply noise without requiring large decoupling capacitors.
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. |
| Quiescent Current | 48μA per comparator at VCC = 2.7V - extends battery life in portable devices operating at low duty cycles. |
| Propagation Delay | 120ns at 100mV overdrive (VCC = 5V, CL = 15pF) - supports high-speed signal discrimination in timing-critical circuits. |
| Input Offset Voltage | ±0.5mV typical - ensures accurate threshold detection down to sub-millivolt levels without calibration. |
| Input Bias Current | 1.0pA typical - allows high-impedance sensor interfaces (e.g., photodiodes, thermistors) without loading error. |
| Common-Mode Range | VEE − 0.25V to VCC + 0.25V - accepts inputs beyond supply rails, simplifying biasing in AC-coupled applications. |
| Output Drive | Sources/sinks 8mA with rail-to-rail swing - directly drives LEDs, logic gates, or small MOSFET gates without external buffers. |
Pinout & Package
The MAX991EKA+T is housed in an 8-pin μMAX® package (U8-1 top mark), measuring 3.0mm × 3.0mm × 1.1mm, with exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTA | Comparator A output | Push-pull active-high/low output; no external pull-up required; compatible with 3V/5V logic families. |
| 2 - INA− | Comparator A inverting input | Differential input node with 1pA bias current; accepts voltages from VEE − 0.25V to VCC + 0.25V. |
| 3 - INA+ | Comparator A noninverting input | Differential input node with identical rail-to-rail common-mode range and ultra-low bias current. |
| 4 - N.C. | No connection | Internally unconnected; must be left floating or tied to GND for mechanical stability (not electrically required). |
| 5 - N.C. | No connection | Internally unconnected; same handling as Pin 4. |
| 6 - INB+ | Comparator B noninverting input | Independent second comparator input; fully decoupled from Channel A electrically and thermally. |
| 7 - INB− | Comparator B inverting input | Second differential pair with matching offset, hysteresis, and input impedance to Channel A. |
| 8 - OUTB | Comparator B output | Independent push-pull output; can be used simultaneously with OUTA for window or latching configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full dynamic range utilization across 2.5V–5.5V supplies - critical for low-voltage sensor front-ends and energy-harvesting systems. |
| 120ns propagation delay | Supports >1MHz signal edge detection - suitable for digital line receivers and fast zero-crossing in motor control feedback loops. |
| 48μA per comparator | Reduces total system quiescent power to <100μA for dual-channel monitoring - ideal for always-on IoT endpoint sensing. |
| Internal ±2.5mV hysteresis | Eliminates need for external positive-feedback resistors in noisy environments - simplifies PCB layout and BOM count. |
| Push-pull output stage | Drives 8mA loads directly to VCC or VEE - removes dependency on external pull-ups and avoids shoot-through current in logic interfacing. |
Applications
| Portable Battery Monitoring | Motor Phase Detection |
|---|---|
Use Scenario: Monitoring cell voltage thresholds in multi-cell Li-ion packs to trigger charge termination or low-battery alerts. IC Role / Device Role / Timing Role: Dual comparator implements precise upper/lower voltage windows using resistor-divider references. Use Value: 0.5mV offset and rail-to-rail inputs ensure ±5mV accuracy across 2.5V–4.2V range; 48μA draw adds negligible load to standby current budget. | Use Scenario: Detecting back-EMF zero-crossing points in brushless DC motor commutation. IC Role / Device Role / Timing Role: One comparator channel compares phase voltage to mid-rail reference; second validates complementary timing. Use Value: 120ns delay enables accurate timing at 30kRPM (≈50kHz electrical frequency); rail-to-rail inputs tolerate wide common-mode swings during PWM periods. |
| Industrial Sensor Thresholding | Optical Pulse Discrimination |
Use Scenario: Converting analog output from pressure or temperature transducers into clean digital alerts for PLC input modules. IC Role / Device Role / Timing Role: Comparator acts as precision discriminator with hysteresis to reject EMI-induced false triggers near setpoints. Use Value: 1pA input bias prevents loading of high-Z bridge sensors; ±2.5mV hysteresis suppresses noise without external components. | Use Scenario: Extracting valid IR remote control pulses from ambient light interference in consumer electronics. IC Role / Device Role / Timing Role: Fast comparator slices modulated carrier envelope; second channel validates pulse width consistency. Use Value: 120ns response resolves 38kHz carrier edges cleanly; low supply current extends remote battery life beyond 12 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX992EUA+T | Same package and pinout, but open-drain output - requires external pull-up; supports output voltage up to 6V above VEE. | Better suited for level translation (e.g., 5V-to-3V logic) or wired-OR bus configurations. | Select MAX992EUA+T only when output must interface with higher-voltage logic or share a common bus line. |
| LMV7235M5X | Single-supply, rail-to-rail, 7nA input bias, but 220ns propagation delay and 85μA supply current - slower and less efficient. | Acceptable for lower-speed industrial monitoring where timing margin exceeds 200ns. | Choose LMV7235M5X if cost sensitivity outweighs speed/power needs and dual-channel integration is not required. |
Compared with MAX991EKA+T, MAX992EUA+T offers voltage-level flexibility at the cost of added external components and reduced drive strength, while LMV7235M5X trades off speed and quiescent current for broader vendor availability and simpler qualification paths in non-critical timing applications.
Availability
MAX991EKA+T is available at Aetrix Electronics and suitable for portable battery monitoring, motor phase detection, and industrial sensor thresholding requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX991EKA+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 (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, communications, and consumer applications.
The MAX991EKA+T belongs to the MAX987/MAX991 family of micropower comparators engineered for ultra-low-power, high-speed decision-making in space-constrained, battery-operated systems.
FAQ
What is the operating temperature range for the MAX991EKA+T?
The MAX991EKA+T is specified and production-tested over the industrial temperature range of −40°C to +85°C. All electrical parameters - including propagation delay, input offset voltage, and supply current - are guaranteed across this full range, making the MAX991EKA+T suitable for deployment in automotive under-hood modules, outdoor industrial sensors, and portable medical devices without derating.
Does the MAX991EKA+T require external hysteresis resistors?
No, the MAX991EKA+T includes internal ±2.5mV hysteresis, eliminating the need for external positive-feedback resistors in most noise-immune threshold-detection applications. This built-in hysteresis ensures clean output transitions even with slow-moving or noisy input signals. External hysteresis can be added via resistor networks if wider bands (>5mV) are required, but it is not necessary for standard operation of the MAX991EKA+T.
Can the MAX991EKA+T operate from a 2.5V supply?
Yes, the MAX991EKA+T operates reliably from a minimum supply voltage of +2.5V up to +5.5V. At VCC = 2.7V, its typical quiescent current remains 48μA per comparator, and propagation delay stays within 120ns at 100mV overdrive. This 2.5V capability enables direct integration into energy-harvesting systems and low-voltage microcontroller peripherals without voltage boosting, preserving the efficiency advantage of the MAX991EKA+T.
What is the maximum output sink/source current of the MAX991EKA+T?
The MAX991EKA+T push-pull output stage can source or sink up to 8mA while maintaining rail-to-rail swing - verified at VCC = 5V (VOH ≥ 4.45V, VOL ≤ 0.55V) and VCC = 2.7V (VOH ≥ 2.3V, VOL ≤ 0.4V). This drive strength allows direct interfacing with LEDs, small-signal MOSFET gates, and standard CMOS/TTL inputs without external buffers, a key differentiator from open-drain alternatives like the MAX992EUA+T.
Is the MAX991EKA+T pin-compatible with other devices in the MAX99x family?
The MAX991EKA+T shares the same 8-pin μMAX® package and pinout with the MAX992EUA+T, enabling drop-in replacement where open-drain functionality is not required. However, it is not pin-compatible with SO-8 versions (e.g., MAX991ESA) due to differing pin assignments, nor with SC70-5 single comparators (e.g., MAX987EXK+T). Always verify land pattern and signal routing before substituting the MAX991EKA+T in existing designs.
MAX991EKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SOT-23-8
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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
- :
- SOT-23-8
MAX991EKA+T FAQ
1.How can I place an order for MAX991EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX991EKA+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 MAX991EKA+T reliable?
The price and inventory of MAX991EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX991EKA+T is usually 5 days.
3.What payment methods are accepted for MAX991EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX991EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX991EKA+T?
MAX991EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX991EKA+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 MAX991EKA+T?
For technical support, including MAX991EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX991EKA+T requirements.
6.How does Aetrix verify that MAX991EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX991EKA+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 MAX991EKA+T meets industry standards.
7.What is the process for return or replacement of MAX991EKA+T?
All MAX991EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX991EKA+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 MAX991EKA+T part is unused and in its original packaging.
Return procedure for MAX991EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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