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Analog Devices Inc./Maxim Integrated MAX9018AEKA+T
- Part No.:
- MAX9018AEKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-8
- Datasheet:
-
MAX9018AEKA+T.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
MAX9018AEKA+T from Maxim Integrated is a dual, ultra-low-power comparator with integrated 1.236V ±1% precision reference and open-drain outputs, designed for 2-cell battery monitoring and ground-referenced sensing. It operates from 1.8V to 5.5V, draws only 1.2μA supply current at +25°C (VCC = 1.8V), features Beyond-the-Rails™ inputs extending 200mV beyond supply rails, and delivers 4mV internal hysteresis for noise-immune switching in portable medical instruments and telemetry systems.
For engineers reviewing the MAX9018AEKA+T datasheet, MAX9018AEKA+T pinout, MAX9018AEKA+T application, or MAX9018AEKA+T equivalent, this page provides verified technical context, package-validated pin functions, real-world use-value metrics for low-voltage battery systems, and confirmed alternative options for mixed-voltage comparator designs requiring rail-to-rail input and open-drain output compatibility.
Technical Context
The MAX9018AEKA+T implements a dual-comparator architecture with independent INA+/INA− and INB+/INB− inputs, where the REF/INA− pin serves as both a precision 1.236V reference output and the inverting input of Comparator A. Its open-drain output stage supports pull-up to voltages up to 5.5V above VEE, enabling level-shifting across mixed-supply domains.
Input common-mode range spans VEE − 0.2V to VCC + 0.2V, and internal hysteresis ensures stable transitions even with slow-moving signals. The crowbar-current-free output design limits supply-current surges during switching, reducing power-supply glitches and eliminating need for large decoupling capacitors in space-constrained battery-powered layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct operation from depleted 2-cell alkaline (1.8V) or single Li-ion (2.9–3.6V) batteries without regulation. |
| Supply Current | 1.2μA at +25°C (VCC = 1.8V) - extends battery life to >1500k hours in 2000mAh AA systems per datasheet Table 1. |
| Reference Voltage | 1.236V ±1% at +25°C - precision threshold source for window/level detection without external components. |
| Input Voltage Range | VEE − 0.2V to VCC + 0.2V - supports sensing at ground or supply line without level-shifting circuitry. |
| Hysteresis | 4mV typical - prevents oscillation on noisy or slowly varying inputs like thermistor or battery voltage ramps. |
| Output Type | Open-drain - allows wired-OR logic, I²C-compatible bus interfacing, and flexible pull-up to higher voltage rails (up to 5.5V above VEE). |
| Propagation Delay | 12µs (low-to-high, VCC = 1.8V, RPULLUP = 100kΩ) - sufficient for battery voltage monitoring and wake-up trigger applications. |
Pinout & Package
MAX9018AEKA+T is housed in an 8-pin SOT23 package (package code T833+2, outline 21-0078), with exposed pad not electrically connected. Pin 1 is marked by a dot; pin numbering follows standard SOT23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF/INA− | 1.236V reference output AND inverting input of Comparator A - enables compact threshold generation with shared node. |
| 2 | INA+ | Noninverting input of Comparator A - accepts signals up to VCC + 0.2V for Beyond-the-Rails sensing. |
| 3 | INB+ | Noninverting input of Comparator B - independent channel for dual-threshold or window detection. |
| 4 | VEE | Negative supply (typically GND) - reference for all inputs and outputs; supports single-supply operation. |
| 5, 8 | N.C. | No internal connection - must be left floating; no routing or thermal relief required. |
| 6 | INB− | Inverting input of Comparator B - used with external resistor divider for adjustable trip points. |
| 7 | VCC | Positive supply input - powers both comparators and reference; decoupling capacitor recommended near pin. |
| 8 | OUTB | Open-drain output of Comparator B - requires external pull-up; sinks up to 6mA when active low. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ Inputs | Supports sensing at ground or supply rail without external biasing - eliminates level-shifters in battery monitor circuits. |
| Integrated 1.236V ±1% Reference | Reduces BOM count and PCB area vs. discrete reference + comparator solutions; TCREF = 40ppm/°C ensures stability over −40°C to +85°C. |
| Open-Drain Output Architecture | Enables mixed-voltage system interfacing (e.g., 1.8V comparator driving 3.3V logic bus) and wired-OR alarm aggregation. |
| 4mV Internal Hysteresis | Guarantees clean, chatter-free switching on slow analog inputs like thermistors or battery voltage decay curves. |
| Crowbar-Current-Free Switching | Minimizes supply current spikes during output transitions - reduces need for bulk capacitance and improves battery efficiency. |
Applications
| 2-Cell Battery Monitoring | Medical Telemetry Sensors |
|---|---|
|
Use Scenario: Real-time detection of end-of-life voltage drop in dual AA/AAA alkaline or NiMH packs powering portable glucose meters. IC Role / Device Role / Timing Role: Dual comparator monitors high/low thresholds using internal reference; OUTA triggers shutdown, OUTB asserts low-battery warning. Use Value: 1.2μA quiescent current extends usable battery life beyond 1500k hours; Beyond-the-Rails inputs eliminate need for resistive dividers on battery rail. |
Use Scenario: Low-power ECG front-end detecting R-wave amplitude thresholds and lead-off conditions in wearable patch monitors. IC Role / Device Role / Timing Role: Comparator A senses amplified R-wave against 1.236V reference; Comparator B monitors electrode impedance via AC-coupled signal. Use Value: Open-drain outputs interface directly with 3.3V microcontroller GPIO; 4mV hysteresis rejects EMG noise without software filtering. |
| Ultra-Low-Power Remote Sensing | Automotive Cabin Temperature Control |
|
Use Scenario: Wireless sensor node measuring soil moisture or ambient light using photodiode or resistive sensor with battery backup. IC Role / Device Role / Timing Role: Comparator converts analog sensor output to digital event; internal reference sets fixed trip point; open-drain output wakes MCU via interrupt. Use Value: 1.2μA ICC enables >10-year operation on CR2032; REF/INA− pin simplifies layout by combining reference and input node. |
Use Scenario: Threshold detection for cabin temperature feedback in automotive HVAC modules powered from 12V battery via LDO. IC Role / Device Role / Timing Role: Comparator A monitors NTC thermistor voltage against 1.236V reference; Comparator B validates sensor continuity. Use Value: Operation down to 1.8V ensures functionality during cold-cranking (battery dip to ~6V → LDO output ≥1.8V); AEC-Q100 Grade 3 qualified for under-hood environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual open-drain comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9018BEKA+T | 1.24V ±1.75% reference (B-grade); otherwise identical pinout, supply current, and timing specs. | Lower reference accuracy acceptable in non-critical threshold detection (e.g., generic power-good signaling). | Select MAX9018BEKA+T when ±1.75% reference tolerance meets system requirements and cost optimization is prioritized. |
| TLV7032DRYR | Push-pull output (not open-drain); 1.8V min supply; 650nA ICC; no internal reference; SOT-23-8 package. | Requires external reference and pull-up resistor for wired-OR; better suited for low-noise, high-speed (>100kHz) applications. | Choose TLV7032DRYR only if push-pull drive and ultra-low ICC outweigh need for integrated reference and open-drain flexibility. |
Compared with MAX9018AEKA+T, MAX9018BEKA+T offers lower-cost reference accuracy while maintaining full functional and pin compatibility, whereas TLV7032DRYR trades internal reference and open-drain capability for lower supply current and higher speed - making it suitable only when external reference infrastructure already exists and level-shifting is unnecessary.
Availability
MAX9018AEKA+T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, medical telemetry sensors, and ultra-low-power remote sensing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX9018AEKA+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 and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and automotive markets.
The MAX9015–MAX9020 family delivers nanoPower dual comparators with integrated references for battery-constrained systems - targeting applications where supply current < 2μA, rail-to-rail input, and small footprint are mandatory.
FAQ
What is the reference voltage tolerance and temperature coefficient of MAX9018AEKA+T?
The MAX9018AEKA+T features an A-grade internal reference with 1.236V ±1% tolerance at +25°C and ±2.5% over −40°C to +85°C. Its temperature coefficient is 40ppm/°C, ensuring stable threshold performance across automotive and industrial temperature ranges without external calibration.
Can MAX9018AEKA+T operate from a single 1.8V supply?
Yes, MAX9018AEKA+T is fully specified to operate from 1.8V to 5.5V. At VCC = 1.8V and +25°C, its supply current is 1.2μA, and it maintains full functionality including Beyond-the-Rails™ input range (VEE − 0.2V to VCC + 0.2V) and 4mV hysteresis - ideal for deeply discharged battery monitoring.
What is the function of the REF/INA− pin on MAX9018AEKA+T?
The REF/INA− pin on MAX9018AEKA+T serves a dual role: it outputs the 1.236V precision reference voltage and simultaneously connects to the inverting input of Comparator A. This integration enables compact window detector or level-shifter designs without external resistors or op-amps, reducing component count and board area.
Does MAX9018AEKA+T support mixed-voltage interfacing?
Yes, MAX9018AEKA+T supports mixed-voltage interfacing via its open-drain outputs (OUTA and OUTB). Each output can be pulled up to any voltage up to 5.5V above VEE, allowing direct connection to 3.3V or 5V logic buses while powered from a 1.8V supply - essential for low-power microcontroller wake-up signaling.
Is MAX9018AEKA+T qualified for automotive applications?
Yes, MAX9018AEKA+T is AEC-Q100 Grade 3 qualified (−40°C to +85°C), meeting reliability and stress-test requirements for automotive cabin and body electronics. Its low supply current, wide input voltage range, and robust hysteresis make it suitable for battery monitoring and sensor interface modules in passenger vehicles.
MAX9018AEKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SOT-23-8
- Series:
- Beyond-the-Rails™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 2
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 1.8V ~ 5.5V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 0.001µA @ 5V
- Current - Input Bias (Max):
- 50mA
- Current - Output (Typ):
- 2.8µA
- Current - Quiescent (Max):
- 80dB PSRR
- CMRR, PSRR (Typ):
- 31µs
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-8
MAX9018AEKA+T FAQ
1.How can I place an order for MAX9018AEKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9018AEKA+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 MAX9018AEKA+T reliable?
The price and inventory of MAX9018AEKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9018AEKA+T is usually 5 days.
3.What payment methods are accepted for MAX9018AEKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9018AEKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9018AEKA+T?
MAX9018AEKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9018AEKA+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 MAX9018AEKA+T?
For technical support, including MAX9018AEKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9018AEKA+T requirements.
6.How does Aetrix verify that MAX9018AEKA+T is sourced from the original manufacturer or authorized distributors?
All MAX9018AEKA+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 MAX9018AEKA+T meets industry standards.
7.What is the process for return or replacement of MAX9018AEKA+T?
All MAX9018AEKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9018AEKA+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 MAX9018AEKA+T part is unused and in its original packaging.
Return procedure for MAX9018AEKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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