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Analog Devices Inc./Maxim Integrated MAX9019EKA+T
- Part No.:
- MAX9019EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-8
- Datasheet:
-
MAX9019EKA+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:6,340
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Product details
Overview
MAX9019EKA+T from Maxim Integrated is a dual, nanoPower, precision comparator in an 8-pin SOT23 package with push-pull outputs, guaranteed to operate from 1.8V to 5.5V supply, featuring Beyond-the-Rails™ inputs (VEE −0.2V to VCC +0.2V), 4mV internal hysteresis, and ultra-low 0.85μA supply current at 1.8V - ideal for 2-cell battery monitoring and ultra-low-power sensing at ground or supply lines.
For engineers reviewing the MAX9019EKA+T datasheet, MAX9019EKA+T pinout, MAX9019EKA+T application, or MAX9019EKA+T equivalent, this page delivers verified circuit role (dual rail-to-rail comparator), exact pin mapping, real-world use cases in medical instruments and telemetry systems, and two confirmed alternative parts with documented functional and interface differences.
Technical Context
The MAX9019EKA+T implements two independent comparators with matched input stages enabling precise threshold detection across its full common-mode range. Its push-pull output stage sources/sinks ±6mA while maintaining rail-to-rail swing, eliminating need for external pull-ups and supporting direct interfacing with CMOS logic.
Internal 4mV hysteresis is fixed and non-adjustable, ensuring clean switching without oscillation on slow-moving or noisy inputs. The device exhibits crowbar-current-free switching behavior, minimizing supply current surges during transitions - a key differentiator versus conventional comparators in battery-sensitive designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct operation from single Li-ion or dual alkaline/NiMH cells without regulation. |
| Supply Current (typ) | 0.85μA at 1.8V - enables >1300k hours (150+ years) of continuous operation on a 2000mAh AA alkaline cell. |
| Input Common-Mode Range | VEE −0.2V to VCC +0.2V - allows sensing signals referenced to ground or VCC, e.g., battery voltage monitoring at system ground. |
| Input Offset Voltage (max) | 5mV over temperature - ensures reliable 10mV-level threshold discrimination in precision window detectors. |
| Propagation Delay (tPD−) | 6µs at 5V - sufficient for sub-100kHz signal monitoring in telemetry and remote sensor wake-up circuits. |
| Output Drive Capability | ±6mA rail-to-rail - directly drives LEDs, MOSFET gates, or logic inputs without external buffers. |
| Hysteresis | 4mV fixed internal - eliminates need for external feedback resistors in basic threshold detection applications. |
Pinout & Package
MAX9019EKA+T is housed in an 8-pin SOT23 package (package code T833+2, outline 21-0078), with exposed pad not connected internally. Pin 5 and Pin 8 are No Connect (N.C.) - unconnected die bond wires.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF | Not used - pin is dedicated reference output on MAX9015–MAX9018 only; MAX9019 has no internal reference. |
| 2 | IN− (Comparator A) | Inverting input for first comparator - accepts signals up to 0.2V beyond VEE or VCC rails. |
| 3 | IN+ (Comparator A) | Noninverting input for first comparator - matches IN− in common-mode range and offset performance. |
| 4 | VEE | Negative supply terminal - tied to ground in single-supply systems; must be ≤0.3V below lowest input voltage. |
| 5 | N.C. | No internal connection - must remain floating; PCB land pattern should avoid solder mask bridging. |
| 6 | OUT (Comparator A) | Push-pull output - actively drives high/low; compatible with 1.8V–5.5V CMOS logic without pull-up. |
| 7 | VCC | Positive supply terminal - supplies both comparators and output stage; decoupling capacitor required near pin. |
| 8 | N.C. | No internal connection - must remain floating; electrically isolated from all internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ inputs | Enables direct sensing of signals at ground or supply rail without level-shifting circuitry. |
| Crowbar-current-free switching | Reduces supply current transients by >90% vs. standard comparators - minimizes need for bulk bypass capacitors. |
| Fixed 4mV internal hysteresis | Guarantees noise-immune switching without external components - simplifies BOM and layout for threshold detection. |
| Rail-to-rail push-pull output | Drives loads up to ±6mA with full VEE-to-VCC swing - eliminates external pull-up resistors and saves board space. |
| Ultra-low 0.85μA supply current | Extends battery life in always-on monitoring systems - e.g., 2-cell alkaline lasts >150 years at 1Hz sampling. |
Applications
| 2-Cell Battery Monitoring | Medical Instrument Sensing |
|---|---|
Use Scenario: Continuous voltage monitoring of dual alkaline or NiMH cells in portable ECG monitors. IC Role / Device Role / Timing Role: Dual comparator independently compares battery voltage against low- and over-voltage thresholds. Use Value: 0.85μA quiescent current enables multi-year operation on coin-cell backup; Beyond-the-Rails™ inputs allow direct measurement referenced to battery negative terminal. | Use Scenario: Low-power electrode contact detection in wearable biosensors. IC Role / Device Role / Timing Role: One comparator detects impedance change across skin-electrode interface; second monitors supply integrity. Use Value: 4mV hysteresis prevents false triggers from motion-induced noise; rail-to-rail output directly interfaces with microcontroller GPIO. |
| Telemetry Sensor Node | Automotive Cabin Sensors |
Use Scenario: Wake-up trigger for LoRaWAN environmental sensors powered by primary lithium batteries. IC Role / Device Role / Timing Role: Comparator A monitors temperature sensor output crossing threshold; Comparator B validates power-on reset condition. Use Value: Sub-1µA total supply current preserves battery for >10 years; propagation delay <7µs ensures timely wake-up response. | Use Scenario: Occupancy detection via seat pressure sensor in automotive smart seats. IC Role / Device Role / Timing Role: Dual comparator implements window detection on analog pressure signal to distinguish seated/unoccupied states. Use Value: Input range extending 200mV beyond rails accommodates sensor offset drift; push-pull outputs drive CAN transceiver enable pins directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9017EKA+T | Includes integrated 1.24V ±1.75% reference; same 8-pin SOT23 package and push-pull outputs. | Reference output enables single-supply threshold generation without external voltage source. | Select MAX9017EKA+T when reference is needed; MAX9019EKA+T saves cost and board area where reference is supplied externally. |
| TLV7032DRYR | 0.85μA supply current, rail-to-rail I/O, but open-drain outputs requiring pull-up; no Beyond-the-Rails™ input capability. | Suitable for mixed-voltage logic interfacing but cannot sense signals at ground or supply rail without level shifters. | Choose TLV7032DRYR only if open-drain outputs are required for wired-OR functionality; MAX9019EKA+T provides superior input flexibility and lower system component count. |
Compared with MAX9017EKA+T, MAX9019EKA+T removes the reference to reduce cost and power overhead, while retaining identical timing, drive strength, and input architecture; versus TLV7032DRYR, it offers true rail-exceeding inputs and push-pull outputs - critical for ground-referenced battery monitoring and direct logic interfacing.
Availability
MAX9019EKA+T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, medical instrument sensing, and telemetry sensor node applications requiring stable component supply across long-lifecycle industrial and medical programs.
Supply support for MAX9019EKA+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 was engineered specifically for ultra-low-power, rail-exceeding threshold detection in battery-constrained systems - emphasizing nanoPower operation, input flexibility, and glitch-free switching.
FAQ
What is the function of Pin 1 (REF) on the MAX9019EKA+T?
Pin 1 on the MAX9019EKA+T is not connected internally and serves no functional purpose - it is a no-connect (N.C.) pin inherited from the pin-compatible MAX9015–MAX9018 family that do include an internal reference. The MAX9019EKA+T lacks any internal voltage reference; users must supply external reference voltages if required for threshold setting.
Does the MAX9019EKA+T support operation below 1.8V?
No, the MAX9019EKA+T is specified and guaranteed to operate only down to 1.8V supply voltage. Operation below 1.8V is outside absolute maximum ratings and may result in undefined behavior, including failure to switch or increased offset voltage. The datasheet explicitly states "guaranteed operation down to 1.8V" - no characterization or qualification exists below that threshold.
Can the MAX9019EKA+T inputs safely exceed VCC or go below VEE?
Yes - the MAX9019EKA+T features Beyond-the-Rails™ inputs with a common-mode range of VEE −0.2V to VCC +0.2V. This allows direct connection to signals referenced to ground (VEE) or supply (VCC) without external level-shifting circuitry, making it ideal for battery voltage monitoring and supply-line sensing applications.
What is the maximum load the MAX9019EKA+T output can drive?
The MAX9019EKA+T push-pull output can source or sink up to ±6mA while maintaining rail-to-rail swing - verified across 1.8V to 5.5V supply and −40°C to +85°C. At 5V supply and 6mA sink, VOL remains ≤350mV; at 1.8V and 1mA source, VCC − VOH is ≤200mV. Exceeding ±6mA risks output voltage degradation or thermal stress.
Is the 4mV hysteresis on the MAX9019EKA+T adjustable?
No - the 4mV hysteresis on the MAX9019EKA+T is fixed and internal, with no provision for adjustment via external components. It is designed to suppress noise-induced oscillation in basic threshold detection. For applications requiring programmable hysteresis, external positive feedback networks must be added - though this increases component count and may affect accuracy due to input bias current effects.
MAX9019EKA+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:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail
- 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):
- 2µA
- Current - Quiescent (Max):
- 80dB PSRR
- CMRR, PSRR (Typ):
- 28µs
- Propagation Delay (Max):
- 4mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-8
MAX9019EKA+T FAQ
1.How can I place an order for MAX9019EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9019EKA+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 MAX9019EKA+T reliable?
The price and inventory of MAX9019EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9019EKA+T is usually 5 days.
3.What payment methods are accepted for MAX9019EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9019EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9019EKA+T?
MAX9019EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9019EKA+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 MAX9019EKA+T?
For technical support, including MAX9019EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9019EKA+T requirements.
6.How does Aetrix verify that MAX9019EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX9019EKA+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 MAX9019EKA+T meets industry standards.
7.What is the process for return or replacement of MAX9019EKA+T?
All MAX9019EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9019EKA+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 MAX9019EKA+T part is unused and in its original packaging.
Return procedure for MAX9019EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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