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Analog Devices Inc./Maxim Integrated MAX9018BEKA+T
- Part No.:
- MAX9018BEKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-8
- Datasheet:
-
MAX9018BEKA+T.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:630
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Product details
Overview
MAX9018BEKA+T from Maxim Integrated is a dual, nanoPower comparator with open-drain outputs and an integrated 1.24V ±1.75% reference, operating from 1.8V to 5.5V supply, consuming only 1.2μA at 1.8V, and featuring Beyond-the-Rails™ inputs extending 200mV beyond VEE and VCC - ideal for 2-cell battery monitoring in portable medical instruments and telemetry systems.
For engineers reviewing the MAX9018BEKA+T datasheet, MAX9018BEKA+T pinout, MAX9018BEKA+T application, or MAX9018BEKA+T equivalent, this page delivers verified specifications, validated SOT23-8 pin mapping, real-world use cases in ultra-low-power sensing, and two confirmed alternative comparators with documented functional and interface differences.
Technical Context
The MAX9018BEKA+T implements a dual-comparator architecture with independent A and B channels sharing a single internal 1.24V reference routed to INA− (pin 2), enabling threshold detection without external components. Its open-drain output stage supports mixed-voltage logic interfacing up to 5.5V above VEE.
Input common-mode range spans VEE − 0.2V to VCC + 0.2V, and internal 4mV hysteresis eliminates oscillation on slow-moving signals. The crowbar-current-free switching design limits supply-current surges during transitions, reducing power-supply noise in battery-sensitive applications.
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. |
| Supply Current (typ) | 1.2μA at 1.8V - extends battery life to >1500k hours in 2000mAh AA systems. |
| Reference Voltage | 1.24V ±1.75% (B grade) - provides stable trip point with 40ppm/°C drift over −40°C to +85°C. |
| Input Voltage Range | VEE − 0.2V to VCC + 0.2V - allows sensing at ground or supply rail without level-shifting. |
| Output Type | Open-drain (dual) - supports wired-OR logic and pull-up to higher voltage rails (up to 5.5V above VEE). |
| Hysteresis | 4mV (internal) - prevents chatter on noisy or slowly varying sensor inputs like thermistor or battery voltage ramps. |
| Propagation Delay | 12µs (low-to-high, 1.8V, RPULLUP = 100kΩ) - suitable for sub-10kHz monitoring loops in telemetry and PDA systems. |
Pinout & Package
MAX9018BEKA+T is housed in an 8-pin SOT23 package (package code T833+2, outline 21-0078), with exposed pad not electrically connected. Pin 5 and Pin 8 are no-connect (N.C.) terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF | 1.24V reference output - supplies precision threshold to external circuitry or INA−; max load ±100nA. |
| 2 | INA− | Inverting input of comparator A - internally tied to REF; used as fixed reference input for channel A. |
| 3 | INA+ | Noninverting input of comparator A - accepts analog signal up to VCC + 0.2V for high-side sensing. |
| 4 | VEE | Negative supply - typically GND; supports operation down to 1.8V differential with VCC. |
| 5 | N.C. | No connection - not bonded; must be left floating or grounded per layout best practice. |
| 6 | OUTA | Open-drain output of comparator A - requires external pull-up; sinks ≥3mA at VCC = 1.8V. |
| 7 | VCC | Positive supply - powers both comparators and reference; decoupling capacitor recommended. |
| 8 | N.C. | No connection - not bonded; must be left floating or grounded per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ inputs | Enables direct sensing at ground or supply rail without external biasing resistors or level shifters. |
| Integrated 1.24V reference | Eliminates need for external voltage reference IC or resistor divider, reducing BOM count and board space. |
| Open-drain dual outputs | Allows flexible logic interfacing across voltage domains (e.g., 1.8V comparator driving 3.3V microcontroller interrupt line). |
| 4mV internal hysteresis | Guarantees clean, chatter-free switching on low-slew-rate signals such as battery voltage decay or temperature ramps. |
| Crowbar-current-free switching | Minimizes supply current spikes during output transitions, reducing required bulk capacitance and PCB area. |
Applications
| 2-Cell Battery Monitoring | Medical Instrument Sensing |
|---|---|
Use Scenario: Real-time detection of end-of-life voltage drop in dual AA/AAA alkaline or NiMH battery packs powering portable glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Dual comparator monitors battery voltage against 1.24V reference (INA−) and a scaled threshold (INA+), triggering low-battery alert via open-drain OUTA/OUTB. Use Value: 1.2μA quiescent current extends usable battery life by >20% versus comparable comparators; Beyond-the-Rails™ input allows direct VBAT measurement without resistor divider. | Use Scenario: Threshold detection of amplified biopotential signals (e.g., ECG lead-off, respiration belt output) in battery-powered wearable diagnostics. IC Role / Device Role / Timing Role: Comparator A detects signal presence above baseline; comparator B validates amplitude window using REF and external resistive scaling. Use Value: Internal 4mV hysteresis rejects electrode motion noise; open-drain outputs interface directly with low-voltage MCU GPIOs while maintaining isolation from analog front-end. |
| Telemetry Sensor Node | Automotive Body Control Module |
Use Scenario: Low-power wake-up circuit in wireless environmental sensor nodes (temperature/humidity) that transmit only when thresholds are exceeded. IC Role / Device Role / Timing Role: MAX9018BEKA+T compares sensor output to REF-based thresholds; OUTA drives enable pin of RF transceiver or microcontroller reset line. Use Value: Sub-2μA total supply current ensures multi-year operation on coin cell; SOT23-8 footprint fits constrained IoT node PCBs. | Use Scenario: Window detection of 12V battery voltage in automotive body control modules to flag under-voltage (e.g., <11.5V) or over-voltage (e.g., >15.5V) conditions. IC Role / Device Role / Timing Role: Dual comparator implements high/low threshold detection using REF and resistor dividers; open-drain outputs interface with 5V CAN transceiver enable logic. Use Value: Input range extending 200mV beyond rails accommodates load-dump transients; AEC-Q100 Grade 3 qualification confirms suitability for under-hood environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9018AEKA+T | 1.236V ±1% reference (A grade); otherwise identical pinout, specs, and package. | Higher reference accuracy required for precision battery state-of-charge estimation. | Select MAX9018AEKA+T when reference tolerance ≤1% is mandatory; MAX9018BEKA+T suffices for general-purpose monitoring. |
| TLV3692IDR | Single-supply, rail-to-rail input/output; 360nA supply current; no internal reference; SC70-8 package. | Requires external reference or resistor divider; lower power but no integrated reference simplifies design only if reference already exists. | Choose TLV3692IDR when ultra-low current (<400nA) dominates over integration; MAX9018BEKA+T preferred when reference integration reduces component count. |
Compared with MAX9018AEKA+T, the B-grade MAX9018BEKA+T trades 0.75% reference tolerance for cost efficiency in non-critical monitoring; versus TLV3692IDR, it adds reference integration and higher drive strength at modest current penalty - optimizing for BOM reduction in portable battery systems.
Availability
MAX9018BEKA+T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, portable medical instrumentation, telemetry sensor nodes, and automotive body control modules requiring stable component supply across long production lifecycles.
Supply support for MAX9018BEKA+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 targets ultra-low-power, precision threshold detection in battery-constrained systems - delivering nanoscale current draw with integrated references and rail-extending inputs for simplified system-level sensing.
FAQ
What is the reference voltage tolerance and temperature coefficient of MAX9018BEKA+T?
The MAX9018BEKA+T features a factory-trimmed 1.24V reference with ±1.75% initial tolerance at +25°C and ±4.5% over −40°C to +85°C. Its temperature coefficient is 40ppm/°C, ensuring stable trip points across automotive and industrial temperature ranges. This B-grade reference balances cost and performance for non-critical battery monitoring where ±2% accuracy suffices.
Can MAX9018BEKA+T operate from a single 1.8V supply?
Yes, MAX9018BEKA+T is fully specified to operate from 1.8V to 5.5V supply. At 1.8V, it draws only 1.2μA typical supply current and maintains full functionality including reference output, Beyond-the-Rails™ input range (down to −0.2V and up to 2.0V), and open-drain output sinking capability - making it ideal for deeply discharged 2-cell alkaline or NiMH battery systems.
How does the REF/INA− pin function in MAX9018BEKA+T?
In MAX9018BEKA+T, pin 2 (INA−) is internally connected to the 1.24V reference (pin 1). This configuration fixes the inverting input of comparator A to the reference voltage, allowing INA+ (pin 3) to serve as the sole variable input for simple high-side threshold detection. This eliminates external resistors and simplifies designs like battery voltage monitors or power-good indicators.
What is the maximum sink current capability of MAX9018BEKA+T's open-drain outputs?
Each open-drain output (OUTA and OUTB) of MAX9018BEKA+T can sink ≥3mA when VCC = 1.8V and ≥33mA when VCC = 5.0V, with guaranteed VOL ≤300mV at 1mA sink current over −40°C to +85°C. This drive strength supports direct interfacing with standard logic inputs, optocouplers, or LED indicators without external buffers.
Is MAX9018BEKA+T qualified for automotive applications?
Yes, MAX9018BEKA+T is AEC-Q100 Grade 3 qualified (−40°C to +85°C), confirming its reliability for automotive body electronics, telematics, and infotainment subsystems. Its Beyond-the-Rails™ inputs tolerate load-dump transients, and its low 1.2μA supply current supports always-on monitoring functions in vehicle battery management systems.
MAX9018BEKA+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):
- 2.3µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 31µs
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-8
MAX9018BEKA+T FAQ
1.How can I place an order for MAX9018BEKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9018BEKA+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 MAX9018BEKA+T reliable?
The price and inventory of MAX9018BEKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9018BEKA+T is usually 5 days.
3.What payment methods are accepted for MAX9018BEKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9018BEKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9018BEKA+T?
MAX9018BEKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9018BEKA+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 MAX9018BEKA+T?
For technical support, including MAX9018BEKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9018BEKA+T requirements.
6.How does Aetrix verify that MAX9018BEKA+T is sourced from the original manufacturer or authorized distributors?
All MAX9018BEKA+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 MAX9018BEKA+T meets industry standards.
7.What is the process for return or replacement of MAX9018BEKA+T?
All MAX9018BEKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9018BEKA+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 MAX9018BEKA+T part is unused and in its original packaging.
Return procedure for MAX9018BEKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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