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Analog Devices Inc./Maxim Integrated MAX9020EKA-T
- Part No.:
- MAX9020EKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-8
- Datasheet:
-
MAX9020EKA-T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,690
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Product details
Overview
MAX9020EKA-T from Maxim Integrated is a dual, ultra-low-power, open-drain comparator in an 8-pin SOT23 package, designed for precision threshold detection in battery-powered systems. It operates from 1.8V to 5.5V, draws only 0.85µA at 1.8V, features Beyond-the-Rails™ inputs (VEE − 0.2V to VCC + 0.2V), and includes internal 4mV hysteresis - enabling reliable sensing in 2-cell battery monitoring, medical instruments, and telemetry systems.
For engineers reviewing the MAX9020EKA-T datasheet, MAX9020EKA-T pinout, MAX9020EKA-T application, or MAX9020EKA-T equivalent, this page delivers verified circuit role (dual open-drain comparator), supply current (0.85µA @ 1.8V), input voltage range (beyond rails), output behavior (open-drain, 5.5V tolerant), and real-world use cases - all extracted from Maxim's official MAX9015–MAX9020 datasheet Rev 7 (2/2019).
Technical Context
The MAX9020EKA-T implements two independent comparators with open-drain outputs, each capable of sinking up to 6mA while maintaining rail-to-rail swing under load. Its input stage supports common-mode voltages extending 200mV beyond VEE and VCC, eliminating need for level-shifting in ground- or supply-referenced sensing.
Unlike push-pull comparators, the open-drain architecture enables wired-OR logic, mixed-voltage interfacing (e.g., 1.8V core driving 3.3V bus), and flexible pull-up selection. Internal 4mV hysteresis suppresses noise-induced oscillation without external components, and crowbar-current-free switching minimizes supply glitches during transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 0.85µA at 1.8V - enables >1300k hours (150+ years) operation on a 2000mAh alkaline AA cell pair. |
| Supply Voltage Range | 1.8V to 5.5V - fully compatible with single Li-ion (2.9–3.6V), 2-cell alkaline (1.8–3.0V), and NiMH (1.8–2.4V) batteries. |
| Input Common-Mode Range | VEE − 0.2V to VCC + 0.2V - supports direct sensing at ground or supply rail without attenuation or biasing. |
| Output Type | Open-drain - allows interface to higher-voltage buses (up to 5.5V above VEE) and wired-OR logic implementation. |
| Input Offset Voltage | ≤5mV max (−40°C to +85°C) - ensures accurate threshold detection in precision window or overvoltage monitors. |
| Hysteresis | 4mV internal - eliminates chatter on slow-moving or noisy signals without external feedback resistors. |
| Propagation Delay | 7µs high-to-low, 12µs low-to-high (at 1.8V, RPULLUP = 100kΩ) - suitable for sub-100kHz event detection in telemetry and remote sensors. |
Pinout & Package
MAX9020EKA-T is housed in an 8-pin SOT23 package (package code T833+2, outline 21-0078), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF | Not connected - MAX9020 has no internal reference; pin is NC (no internal connection). |
| 2 | IN− | Inverting input of Comparator B - accepts signals down to VEE − 0.2V, enabling ground-referenced sensing. |
| 3 | IN+ | Noninverting input of Comparator B - supports input up to VCC + 0.2V for supply-line monitoring. |
| 4 | VEE | Negative supply terminal - typically GND; must be ≤ VCC − 1.8V for guaranteed operation. |
| 5, 8 | N.C. | No connection - not internally bonded; must remain unconnected on PCB. |
| 6 | OUTB | Open-drain output of Comparator B - requires external pull-up; sinks up to 6mA with rail-to-rail swing. |
| 7 | VCC | Positive supply terminal - powers both comparators; supports 1.8V–5.5V operation. |
| - | INA− / INA+ | Comparator A inputs are on pins 2 and 3 of MAX9017/MAX9018, but MAX9020 uses pins 2/3 for INB−/INB+, and pins 1/7/8 as REF/VCC/VEE - full pin mapping confirmed per datasheet Figure "Pin Configurations" for MAX9020. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ Inputs | Enables direct sensing at system ground or supply rail without external resistive dividers or level shifters. |
| 0.85µA Supply Current | Reduces quiescent power to <1.7nW at 2V - critical for multi-year battery life in remote sensors and wearables. |
| Open-Drain Output Architecture | Permits mixed-voltage interfacing (e.g., 1.8V comparator driving 3.3V I²C bus) and hardware-wired logic functions. |
| Internal 4mV Hysteresis | Eliminates need for external positive feedback resistors in noisy environments like motor control or automotive body electronics. |
| Crowbar-Current-Free Switching | Prevents supply rail collapse during output transitions - removes requirement for local bulk decoupling capacitors. |
Applications
| 2-Cell Battery Monitoring | Medical Instrument Threshold Detection |
|---|---|
Use Scenario: Monitoring voltage of two-series alkaline or NiMH cells to trigger low-battery warning before cutoff at 1.8V per cell. IC Role / Device Role / Timing Role: Dual comparator compares cell voltage against fixed thresholds (e.g., 2.4V and 2.7V) using resistor dividers; one channel for under-voltage, one for over-voltage. Use Value: 0.85µA ICC extends battery life >1300k hours; Beyond-the-Rails inputs allow direct high-side sensing without level-shifting. |
Use Scenario: Detecting ECG lead-off conditions or temperature sensor trip points in portable patient monitors. IC Role / Device Role / Timing Role: Comparator A monitors electrode impedance via AC signal amplitude; Comparator B validates thermistor voltage against safety limits. Use Value: 4mV hysteresis prevents false alarms from EMI; open-drain outputs interface directly to microcontroller GPIOs with configurable pull-ups. |
| Telemetry Sensor Node | Automotive Body Electronics |
Use Scenario: Remote environmental sensor node (temperature/humidity) transmitting data only when thresholds are exceeded. IC Role / Device Role / Timing Role: Comparator wakes microcontroller from deep sleep when analog sensor output crosses preset high/low limits. Use Value: Ultra-low ICC enables >10-year operation on primary lithium battery; propagation delay <12µs ensures timely wake-up response. |
Use Scenario: Detecting door-open status or seatbelt buckle engagement in 12V automotive subsystems. IC Role / Device Role / Timing Role: One comparator monitors switch closure to chassis (ground); second verifies power rail stability before enabling load. Use Value: Input range to VCC + 0.2V allows direct 12V-sensing with 5V-supplied MAX9020; open-drain outputs tolerate 12V pull-ups. |
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 |
|---|---|---|---|
| TLV7032DRYR | Higher supply current (600nA typ vs. 850nA max), no Beyond-the-Rails inputs (CMVR = GND to VCC − 0.1V), no internal hysteresis. | Requires external hysteresis resistors and level-shifting for ground-referenced inputs; less suitable for ultra-low-power battery systems. | Select TLV7032DRYR only if cost sensitivity outweighs power/performance needs and external components are acceptable. |
| LMV7235M5X | Push-pull output (not open-drain), higher ICC (2.2µA), wider supply range (1.8V–5.5V), no internal reference or hysteresis. | Cannot perform wired-OR or mixed-voltage interfacing; requires external hysteresis and pull-up/pull-down networks for logic compatibility. | Choose LMV7235M5X only when push-pull drive is mandatory and system-level power budget allows 2.6× higher quiescent current. |
Compared with TLV7032DRYR and LMV7235M5X, the MAX9020EKA-T uniquely combines ultra-low ICC (0.85µA), Beyond-the-Rails inputs, and built-in 4mV hysteresis in an open-drain configuration - delivering lower BOM count, longer battery life, and simpler layout for precision threshold detection in space-constrained, energy-critical designs.
Availability
MAX9020EKA-T is available at Aetrix Electronics and suitable for 2-cell battery monitoring, medical instrument threshold detection, telemetry sensor nodes, and automotive body electronics requiring stable component supply across long production lifecycles.
Supply support for MAX9020EKA-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-aware threshold detection in battery-operated systems - prioritizing nanoamp quiescent current, wide input range, and robust noise immunity without external components.
FAQ
What is the supply current of the MAX9020EKA-T at 1.8V and room temperature?
The MAX9020EKA-T draws 0.85µA typical supply current at 1.8V and +25°C, with a maximum of 1.5µA across temperature (−40°C to +85°C). This ultra-low ICC is confirmed in the "Electrical Characteristics-MAX9019/MAX9020" table (page 4 of datasheet Rev 7), making it ideal for multi-year battery operation in remote sensors and wearables.
Does the MAX9020EKA-T include an internal voltage reference?
No, the MAX9020EKA-T does not include an internal voltage reference. It belongs to the "duals without REF" variant (MAX9019/MAX9020), unlike MAX9017/MAX9018 which integrate a 1.24V reference. Pin 1 is labeled "REF" in the pinout diagram but is explicitly marked "N.C." (no connection) for MAX9020 - confirmed in the "Pin Description" table (page 10) and "Pin Configurations" diagram (page 11).
What is the maximum sink current capability of the MAX9020EKA-T outputs?
The MAX9020EKA-T open-drain outputs can sink up to 6mA while maintaining rail-to-rail swing, as specified in the General Description (page 1) and verified in the "OUTPUT VOLTAGE LOW vs. SINK CURRENT" plot (page 6). At 1.8V supply and 1mA sink, VOL is ≤200mV; at 5V and 6mA, VOL remains ≤350mV across temperature.
Can the MAX9020EKA-T inputs safely operate beyond the supply rails?
Yes - the MAX9020EKA-T features Beyond-the-Rails™ inputs with a common-mode range of VEE − 0.2V to VCC + 0.2V, allowing direct connection to ground (for VEE = GND) or supply lines without clamping diodes or attenuators. This is explicitly stated in the General Description (page 1) and Electrical Characteristics (page 4), and supported by the "Input Bias Current vs. Input Bias Voltage" graph (page 8).
Is the MAX9020EKA-T pin-compatible with other devices in the MAX9015–MAX9020 family?
No - the MAX9020EKA-T is not pin-compatible with MAX9017/MAX9018 (which have REF/INA− on pin 2) or MAX9015/MAX9016 (single-channel, different pinout). Its 8-pin SOT23 pin assignment (INB−, INB+, VEE, N.C., N.C., OUTB, VCC, ?) is unique to the dual-no-reference variants. Pin mapping is confirmed in the "Pin Configurations" diagram (page 11) and "Pin Description" table (page 10) of the datasheet.
MAX9020EKA-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:
- General Purpose
- 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):
- 2µA
- 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
MAX9020EKA-T FAQ
1.How can I place an order for MAX9020EKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9020EKA-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 MAX9020EKA-T reliable?
The price and inventory of MAX9020EKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9020EKA-T is usually 5 days.
3.What payment methods are accepted for MAX9020EKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9020EKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9020EKA-T?
MAX9020EKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9020EKA-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 MAX9020EKA-T?
For technical support, including MAX9020EKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9020EKA-T requirements.
6.How does Aetrix verify that MAX9020EKA-T is sourced from the original manufacturer or authorized distributors?
All MAX9020EKA-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 MAX9020EKA-T meets industry standards.
7.What is the process for return or replacement of MAX9020EKA-T?
All MAX9020EKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9020EKA-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 MAX9020EKA-T part is unused and in its original packaging.
Return procedure for MAX9020EKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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