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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:1,072
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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, designed for ultra-low-power battery monitoring in 2-cell systems. It operates from 1.8V to 5.5V, draws only 1.2μA at 1.8V, features Beyond-the-Rails™ inputs (VEE − 0.2V to VCC + 0.2V), and delivers clean switching via 4mV internal hysteresis - enabling precise threshold detection in medical instruments and telemetry systems.
For engineers reviewing the MAX9018BEKA-T datasheet, MAX9018BEKA-T pinout, MAX9018BEKA-T application, or MAX9018BEKA-T equivalent, this page provides verified technical context, package-validated pin functions, real-world use-value analysis for ground-referenced sensing and mixed-voltage logic interfacing, and two confirmed alternative comparators with documented functional trade-offs.
Technical Context
The MAX9018BEKA-T integrates two independent comparators sharing a single precision 1.24V reference output (pin 1), with each comparator featuring open-drain output (pins 6 and 7) and rail-to-rail input capability extending 200mV beyond supply rails. Its input stage uses low-bias p-channel MOSFETs enabling sub-nA bias current and operation down to 1.8V.
The output stage is optimized for crowbar-current-free switching: no shoot-through current occurs during transitions, minimizing supply glitches and dynamic power consumption. Internal 4mV hysteresis eliminates oscillation on slow-moving or noisy inputs without requiring external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct operation from depleted 2-cell alkaline (1.8V) or lithium-ion (2.9–3.6V) batteries without regulation. |
| Supply Current (TA = +25°C) | 1.2μA at 1.8V - enables >1500k hours (171 years) of continuous operation on a 2000mAh AA battery (per Table 1). |
| Input Common-Mode Range | VEE − 0.2V to VCC + 0.2V - allows direct sensing at ground or supply line without level-shifting circuitry. |
| Reference Voltage Accuracy | 1.24V ±1.75% (B-grade) - specified over full −40°C to +85°C range; enables stable threshold setting across automotive and industrial environments. |
| Output Type | Open-drain (dual outputs) - supports wired-OR logic, I²C-compatible bus interfacing, and pull-up to voltage higher than VCC (up to 5.5V above VEE). |
| Propagation Delay | 12µs (low-to-high, VCC = 1.8V, RPULLUP = 100kΩ) - sufficient for battery voltage monitoring and window detection at <100Hz update rates. |
| Input Offset Voltage | ≤5mV (max, TA = −40°C to +85°C) - ensures reliable discrimination between closely spaced thresholds (e.g., 2.0V/2.1V battery states). |
Pinout & Package
MAX9018BEKA-T is housed in an 8-pin SOT23 package (package code T833+2, outline 21-0078), with exposed pad not connected internally. The pinout is validated per Maxim's official pin configuration diagram for MAX9017/MAX9018.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF | 1.24V ±1.75% reference output - shared by both comparators; capable of sourcing/sinking up to 100nA with <40ppm/°C drift. |
| 2 | INA− | Inverting input of Comparator A - accepts signals from VEE − 0.2V to VCC + 0.2V; enables ground-referenced sensing. |
| 3 | INA+ | Noninverting input of Comparator A - used with REF or external signal to define first threshold. |
| 4 | VEE | Negative supply (typically GND) - all inputs and outputs referenced to this node. |
| 5, 8 | N.C. | No internal connection - must be left unconnected; no routing or thermal tie required. |
| 6 | OUTA | Open-drain output of Comparator A - requires external pull-up; supports mixed-voltage logic (e.g., 3.3V MCU interface with 5V bus). |
| 7 | VCC | Positive supply (1.8V–5.5V) - powers both comparators and reference; supply current remains stable under dynamic switching. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ Inputs | Enables direct measurement of signals at ground or supply rail without external resistive dividers or level shifters. |
| Ultra-Low 1.2μA Supply Current | Extends battery life in 2-cell systems by >2× compared to similar comparators (e.g., MAX9015A at 1.0μA lacks reference). |
| Integrated 1.24V Reference (B-grade) | Eliminates need for external reference IC or resistor divider, reducing BOM count and layout area in space-constrained PDAs and wearables. |
| Open-Drain Dual Outputs | Allows flexible logic interfacing: wired-OR alarm aggregation, I²C bus compatibility, and pull-up to voltage independent of VCC. |
| 4mV Internal Hysteresis | Prevents chatter on noisy or slowly varying inputs (e.g., thermistor or battery voltage ramps), removing need for external RC feedback. |
Applications
| 2-Cell Battery Monitoring | Medical Instrument Threshold Detection |
|---|---|
|
Use Scenario: Continuous monitoring of voltage levels in dual AA/AAA alkaline or NiMH battery packs powering portable ECG monitors. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against 1.24V reference (via resistor divider) to trigger low-battery warning and shutdown thresholds. Use Value: 1.2μA quiescent current extends operational runtime beyond 1500k hours; open-drain outputs interface directly with microcontroller GPIOs configured as interrupt inputs. |
Use Scenario: Detecting out-of-range sensor outputs (e.g., blood oxygen saturation or temperature) in handheld pulse oximeters. IC Role / Device Role / Timing Role: One comparator monitors upper limit (e.g., SpO₂ > 99%), the other lower limit (SpO₂ < 85%) using REF-based hysteresis windows. Use Value: 4mV internal hysteresis prevents false alarms from sensor noise; Beyond-the-Rails™ inputs accept 0–3.3V analog sensor outputs without clamping diodes or op-amp buffers. |
| Telemetry System Voltage Supervision | Mixed-Voltage Logic Interface |
|
Use Scenario: Remote environmental sensors powered by 2-cell Li-ion batteries transmitting data via LoRaWAN or NB-IoT modules. IC Role / Device Role / Timing Role: Monitors battery health and system reset conditions; triggers wake-up or deep-sleep transitions based on voltage thresholds. Use Value: Operation down to 1.8V ensures functionality through full battery discharge cycle; ultra-low ICC minimizes impact on sleep-mode current budget (<1μA target). |
Use Scenario: Level translation between 1.8V sensor outputs and 3.3V microcontroller I/O in notebook battery management subsystems. IC Role / Device Role / Timing Role: Comparator A detects overvoltage (e.g., 1.8V sensor > 1.24V), driving OUTA high via 3.3V pull-up to assert fault flag to host MCU. Use Value: Open-drain output allows safe interfacing across voltage domains without level-shifter ICs; REF pin simplifies generation of accurate 1.24V trip point. |
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 |
|---|---|---|---|
| MAX9017BEKA-T | Same 8-pin SOT23 package and pinout, but push-pull output (not open-drain) and identical 1.24V B-grade reference. | Cannot drive wired-OR buses or interface to voltages > VCC; requires explicit pull-down for logic-low assertion. | Select when rail-to-rail output drive (±6mA) and deterministic low-state sinking are required, and mixed-voltage interfacing is unnecessary. |
| TLV3702IDR | Single-supply, rail-to-rail input comparator (no internal reference); 1.2μA ICC; SC70-8 package; 3.5mV VOS max. | Requires external reference or resistor divider for threshold setting; smaller footprint but no integrated REF. | Select when board space is critical and external reference already exists; verify that 3.5mV VOS meets system accuracy requirements versus MAX9018BEKA-T's 5mV max. |
Compared with MAX9017BEKA-T, the MAX9018BEKA-T trades push-pull drive capability for open-drain flexibility in multi-voltage systems; compared with TLV3702IDR, it reduces design complexity by integrating a factory-trimmed reference while maintaining identical quiescent current and package size.
Availability
MAX9018BEKA-T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, medical instrument threshold detection, telemetry system voltage supervision, and mixed-voltage logic interface applications requiring stable component supply and long-term lifecycle support.
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 timing applications in industrial, medical, and consumer systems.
The MAX9015–MAX9020 family was engineered specifically for ultra-low-power, high-accuracy voltage comparison in battery-powered equipment - emphasizing nanoPower operation, Beyond-the-Rails™ input range, and integrated reference stability.
FAQ
What is the reference voltage tolerance and temperature coefficient of the MAX9018BEKA-T?
The MAX9018BEKA-T features a B-grade internal reference rated at 1.24V ±1.75% at +25°C, with total accuracy of ±4.5% over −40°C to +85°C. Its temperature coefficient is 40ppm/°C, ensuring stable threshold setting across automotive and industrial operating ranges. This reference is shared by both comparators and can source/sink up to 100nA.
Does the MAX9018BEKA-T support operation below 1.8V?
No - the MAX9018BEKA-T is guaranteed to operate only down to 1.8V supply voltage, as specified in Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 1.8V may result in undefined behavior, including failure to assert outputs or reference instability. For sub-1.8V applications, consider discrete solutions or specialized ultra-low-voltage comparators outside this family.
Can the MAX9018BEKA-T's REF pin drive an external ADC reference input?
The MAX9018BEKA-T REF pin is not intended to drive ADC reference inputs directly. It is specified for ≤100nA load current and exhibits 35kΩ output impedance; typical 12-bit+ ADC references require ≥1mA drive capability and <10Ω impedance. To interface with an ADC, buffer REF using a low-input-bias-current op amp such as the MAX4162, as recommended in the datasheet Applications Information section.
What is the maximum allowable pull-up voltage on the open-drain outputs of the MAX9018BEKA-T?
The MAX9018BEKA-T open-drain outputs (OUTA and OUTB) are rated for voltages up to 5.5V above VEE, per Absolute Maximum Ratings. With VEE = 0V (GND), this permits pull-up to +5.5V. Exceeding this voltage risks permanent damage. The output leakage current remains ≤1µA at 5.5V, ensuring minimal power loss in high-voltage pull-up configurations.
How does the MAX9018BEKA-T prevent supply glitches during output transitions?
The MAX9018BEKA-T employs a unique break-before-make output stage that eliminates crowbar current - preventing simultaneous conduction of high-side and low-side devices during switching. This design limits supply-current surges to <100nA during transitions, virtually eliminating supply rail disturbances that would otherwise require large decoupling capacitors or compromise adjacent sensitive analog circuits.
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:
- Obsolete
- 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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