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Analog Devices Inc./Maxim Integrated MAX9018AAAKA+T
- Part No.:
- MAX9018AAAKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX9018AAAKA+T.pdf
- Description:
- DUAL, PRECISION, 1.8V,NANOPOWER
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
MAX9018AAAKA+T from Maxim Integrated is a dual, precision, nanopower comparator in an 8-pin SOT23 package with integrated 1.236V ±1% reference and open-drain outputs. It operates down to 1.8V supply, draws only 1.2µA supply current, features Beyond-the-Rails™ inputs extending 200mV beyond VEE/VCC, and delivers clean switching via 4mV internal hysteresis - ideal for 2-cell battery monitoring and ultra-low-power threshold detection.
For engineers reviewing the MAX9018AAAKA+T datasheet, MAX9018AAAKA+T pinout, MAX9018AAAKA+T application, or MAX9018AAAKA+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support for industrial and portable electronics design.
Technical Context
The MAX9018AAAKA+T integrates two independent comparators sharing a single precision 1.236V ±1% bandgap reference routed to the inverting input of Comparator A (REF/INA− pin). Its open-drain output stage supports mixed-voltage logic interfacing up to 5.5V above VEE and eliminates crowbar current during switching.
Input common-mode range spans VEE − 0.2V to VCC + 0.2V, enabling sensing at ground or supply rails. Internal 4mV hysteresis prevents oscillation on slow or noisy inputs, while ultra-low 1.2µA supply current (typ. at 1.8V) ensures minimal quiescent drain in battery-critical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct operation from single Li-ion or dual alkaline/NiMH cells without regulation. |
| Supply Current | 1.2µA (max over temp) - extends battery life >1,500k hours in 2-cell alkaline systems (2000mAh). |
| Input Offset Voltage | <5mV (max) - ensures accurate threshold detection within tight voltage windows (e.g., battery end-of-life at 1.8V). |
| Reference Voltage | 1.236V ±1% - stable, factory-trimmed reference eliminates external voltage divider error and layout sensitivity. |
| Input Common-Mode Range | VEE − 0.2V to VCC + 0.2V - supports direct sensing of signals at ground or rail without level-shifting circuitry. |
| Output Type | Open-drain - allows wired-OR logic, I²C-compatible bus interfacing, and pull-up to higher voltage domains (up to 5.5V). |
| Hysteresis | 4mV (internal) - suppresses chatter on low-slew-rate inputs (e.g., thermistor or photodiode outputs) without external components. |
Pinout & Package
MAX9018AAAKA+T is housed in an 8-pin SOT23 package (JEDEC MO-203AA), measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF/INA− | Internal 1.236V reference output; internally connected to Comparator A inverting input - use as reference source or direct threshold node. |
| 2 | INA− | Comparator A inverting input - externally accessible when REF/INA− is not used as reference. |
| 3 | INA+ | Comparator A noninverting input - accepts signals up to VCC + 0.2V for rail-to-rail sensing. |
| 4 | VEE | Negative supply (GND) - return path for reference and comparator bias currents. |
| 5 | INB+ | Comparator B noninverting input - independent of Comparator A; supports dual-threshold or window detection. |
| 6 | INB− | Comparator B inverting input - accepts signals down to VEE − 0.2V for ground-referenced sensing. |
| 7 | OUTB | Comparator B open-drain output - requires external pull-up; sinks current only, enabling mixed-voltage logic interface. |
| 8 | VCC | Positive supply (1.8V–5.5V) - powers both comparators and reference; low PSRR (≤1 mV/V) demands local decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ Inputs | Enables direct measurement of signals at GND or VCC without clamping diodes or level shifters - critical for battery voltage monitoring at endpoint. |
| Ultra-Low 1.2µA Supply Current | Reduces average system current by >90% vs. standard comparators, directly extending shelf life and runtime in always-on sensor nodes. |
| Integrated 1.236V ±1% Reference | Eliminates external resistor divider tolerance stack-up and temperature drift - improves threshold accuracy to ±12.4mV over −40°C to +85°C. |
| Open-Drain Outputs | Supports flexible logic interfacing: pull-up to 3.3V/5V microcontrollers, I²C bus compatibility, and wired-OR alarm aggregation across multiple sensors. |
| 4mV Internal Hysteresis | Prevents false triggering on EMI-prone PCB traces or high-impedance sensor outputs - removes need for external positive feedback resistors. |
Applications
| 2-Cell Battery Monitoring | Low-Power Threshold Detection |
|---|---|
Use Scenario: Monitoring voltage decay of dual alkaline/NiMH cells in portable medical devices or remote sensors. IC Role / Device Role / Timing Role: Dual comparator compares cell voltage against 1.236V reference (via REF/INA−) and hysteresis-set thresholds to flag under-voltage conditions. Use Value: 1.2µA quiescent current enables >1,500k hours of operation on 2000mAh cells; Beyond-the-Rails™ inputs measure down to 0V without level shifters. | Use Scenario: Detecting ambient light level crossing via photodiode output in IoT edge nodes. IC Role / Device Role / Timing Role: Comparator A triggers wake-up signal when light exceeds threshold; Comparator B monitors dark condition for sleep mode entry. Use Value: Open-drain outputs interface directly with 3.3V MCU GPIO; 4mV hysteresis rejects noise from long sensor traces without RC filtering. |
| Ground-Referenced Sensing | Mixed-Voltage System Interface |
Use Scenario: Measuring thermistor voltage drop across GND in battery-powered HVAC controllers. IC Role / Device Role / Timing Role: INA− tied to GND; INA+ senses thermistor divider - leveraging input range extending 200mV below GND for margin. Use Value: Eliminates need for negative supply or op-amp buffer; <5mV offset ensures ±0.5°C temperature resolution at 25°C. | Use Scenario: Aggregating fault signals from 1.8V, 3.3V, and 5V subsystems onto a single 3.3V MCU interrupt line. IC Role / Device Role / Timing Role: Each comparator's open-drain output pulls shared bus low; external 3.3V pull-up ensures logic compatibility. Use Value: No level translators required; 5.5V-tolerant outputs prevent damage from voltage mismatches during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual nanopower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9018BAKA+T | 1.24V ±1.75% reference (B-grade); otherwise identical pinout, supply current, and open-drain outputs. | Slightly lower reference accuracy; suitable where ±1.75% threshold tolerance is acceptable (e.g., coarse battery state indication). | Select MAX9018BAKA+T for cost-sensitive designs where 1.24V reference drift is tolerable. |
| TLV7032DRYR | 2.5V fixed reference; 650nA supply current; push-pull output; no Beyond-the-Rails™ inputs (CM range: VSS to VDD − 0.1V). | Lower power but lacks rail-to-rail input capability and integrated precision reference - requires external reference or resistor divider. | Choose TLV7032DRYR only if system uses 2.5V supply and can accommodate external threshold generation. |
Compared with MAX9018BAKA+T, the MAX9018AAAKA+T offers tighter reference accuracy (±1% vs. ±1.75%) for precise battery end-of-life detection; versus TLV7032DRYR, it provides true Beyond-the-Rails™ inputs and integrated 1.236V reference - eliminating external components and enabling ground-referenced sensing.
Availability
MAX9018AAAKA+T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, ultra-low-power threshold detection, and ground-referenced sensing applications requiring stable component supply and guaranteed long-term availability.
Supply support for MAX9018AAAKA+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 portable systems.
The MAX9015–MAX9020 family was engineered specifically for nanopower, dual-comparator functions in battery-constrained environments - integrating precision references, rail-to-rail inputs, and glitch-free switching to minimize system-level power-supply filtering.
FAQ
What is the reference voltage accuracy and temperature stability of the MAX9018AAAKA+T?
The MAX9018AAAKA+T features an internal 1.236V reference with ±1% initial accuracy over −40°C to +85°C and a typical temperature coefficient of 40ppm/°C. This ensures reference drift remains within ±0.012V across the full operating range, supporting stable threshold detection in unregulated battery systems.
Can the MAX9018AAAKA+T operate from a single 1.8V supply?
Yes, the MAX9018AAAKA+T is fully specified to operate from 1.8V to 5.5V. At 1.8V, it maintains 1.2µA supply current (max), 4mV hysteresis, and Beyond-the-Rails™ input range (VEE − 0.2V to VCC + 0.2V), making it ideal for direct connection to depleted 2-cell alkaline or NiMH batteries.
How does the REF/INA− pin function in the MAX9018AAAKA+T?
The REF/INA− pin on the MAX9018AAAKA+T serves a dual role: it outputs the internal 1.236V reference and is internally connected to the inverting input of Comparator A. When used as a reference, INA− is overridden; when used as an input, the reference must be disconnected externally to avoid loading errors.
What is the maximum sink current capability of the MAX9018AAAKA+T outputs?
The open-drain outputs of the MAX9018AAAKA+T can sink up to 6mA while maintaining VOL ≤ 450mV at VCC = 5.0V and TA = TMIN to TMAX. At 1.8V supply, sink capability is derated to ~3mA (VOL ≤ 300mV), sufficient to drive standard logic inputs or small LEDs directly.
Does the MAX9018AAAKA+T require an external bypass capacitor on the REF pin?
No external bypass capacitor is required on the REF pin of the MAX9018AAAKA+T for most applications. The internal reference has low output impedance (~35kΩ) and stable operation; however, in electrically noisy environments or with fast transients, a 1nF–10nF ceramic capacitor from REF to GND is recommended to suppress coupling.
MAX9018AAAKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
MAX9018AAAKA+T FAQ
1.How can I place an order for MAX9018AAAKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9018AAAKA+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 MAX9018AAAKA+T reliable?
The price and inventory of MAX9018AAAKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9018AAAKA+T is usually 5 days.
3.What payment methods are accepted for MAX9018AAAKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9018AAAKA+T transactions.
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4.How is shipping managed for MAX9018AAAKA+T?
MAX9018AAAKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9018AAAKA+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 MAX9018AAAKA+T?
For technical support, including MAX9018AAAKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9018AAAKA+T requirements.
6.How does Aetrix verify that MAX9018AAAKA+T is sourced from the original manufacturer or authorized distributors?
All MAX9018AAAKA+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 MAX9018AAAKA+T meets industry standards.
7.What is the process for return or replacement of MAX9018AAAKA+T?
All MAX9018AAAKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9018AAAKA+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 MAX9018AAAKA+T part is unused and in its original packaging.
Return procedure for MAX9018AAAKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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