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Analog Devices Inc./Maxim Integrated MAX985EXK-T
- Part No.:
- MAX985EXK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX985EXK-T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,192
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Product details
Overview
MAX985EXK-T from Maxim Integrated is a micropower, low-voltage, rail-to-rail input/output comparator in SC70-5 package, operating from 2.5V to 5.5V supply, with 1.4µA typical quiescent current, 10µs propagation delay at VCC = 3V, and open-drain output. It targets battery-powered sensor monitoring and precision threshold detection in portable instrumentation.
For engineers reviewing the MAX985EXK-T datasheet, MAX985EXK-T pinout, MAX985EXK-T application, or MAX985EXK-T equivalent, this page delivers verified electrical parameters, SC70-5 terminal mapping, real-world use cases in low-power analog signal conditioning, and two validated alternative comparators with documented functional trade-offs.
Technical Context
The MAX985EXK-T implements a single-channel, CMOS-input comparator with rail-to-rail input common-mode range extending from VEE – 0.1V to VCC + 0.1V and rail-to-rail output swing capability when driving light loads. Its internal hysteresis is not present-external hysteresis must be added for noise immunity in noisy environments.
Designed for ultra-low-power operation, the device features a guaranteed maximum supply current of 2.5µA over temperature (–40°C to +85°C), supports 2.5V to 5.5V single-supply operation, and maintains 10mV input offset voltage max at room temperature. It is not intended for high-speed (>100kHz) or high-precision (<1mV offset) applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V - enables direct interface with Li-ion battery (3.0–4.2V) or 3.3V logic without level-shifting. |
| Quiescent Current | 1.4µA typical - allows multi-year operation on coin-cell batteries in always-on wake-up circuits. |
| Propagation Delay | 10µs at VCC = 3V - suitable for slow-varying signals like temperature or pressure thresholds, not fast pulse edges. |
| Input Offset Voltage | ±10mV max - sufficient for detecting >50mV signal excursions; requires external trimming for sub-10mV accuracy. |
| Output Type | Open-drain - permits wired-OR logic, level translation up to 5.5V, and pull-up to separate supply domain. |
| Rail-to-Rail I/O | Yes - inputs accept signals from ground to VCC; output swings within 100mV of rails under 100µA load. |
Pinout & Package
MAX985EXK-T is housed in a 5-pin SC70 package (2.0mm × 1.25mm, 0.95mm height), compatible with standard SC70 reflow profiles and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN–) | Inverting Input | Accepts reference voltage or inverted signal path; common-mode range extends to VEE – 0.1V. |
| 2 (IN+) | Noninverting Input | Accepts sensed signal; rail-to-rail input enables direct connection to resistive divider outputs. |
| 3 (GND) | Ground Reference | Primary return path for supply and signal; must be low-impedance for stable threshold behavior. |
| 4 (OUT) | Open-Drain Output | Requires external pull-up; supports mixed-voltage interfacing and shared-bus signaling. |
| 5 (VCC) | Positive Supply | Single supply only; no negative rail support; bypass capacitor (0.1µF) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 1.4µA typical supply current enables >10-year battery life in continuous-sense applications using CR2032. |
| Rail-to-Rail Inputs | Supports full-scale sensing across entire supply range - eliminates need for input biasing resistors in single-supply systems. |
| Open-Drain Output | Allows flexible logic-level translation and multi-comparator wired-OR outputs without external diodes or gates. |
| SC70-5 Package | 2.0mm × 1.25mm footprint saves >60% board area vs. SO-8; compatible with automated pick-and-place and reflow. |
Applications
| Battery Voltage Monitor | Temperature Threshold Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during discharge to trigger low-battery warning at 3.2V cutoff. IC Role / Device Role / Timing Role: Comparator compares divided cell voltage against precision reference; open-drain output drives microcontroller interrupt line. Use Value: 1.4µA quiescent current minimizes self-discharge; rail-to-rail input accepts 0–4.2V range without external level shifters. |
Use Scenario: Detecting overheating in wearable electronics using NTC thermistor network. IC Role / Device Role / Timing Role: Compares thermistor voltage divider output against fixed reference; triggers shutdown when resistance drops below threshold. Use Value: 10µs propagation delay ensures timely response to thermal events; SC70-5 footprint fits inside compact wristband PCB. |
| Smoke Detector Sensor Interface | Portable Medical Sensor Alert |
Use Scenario: Interfacing ionization chamber output to microcontroller in battery-powered smoke alarms. IC Role / Device Role / Timing Role: Amplifies and compares weak chamber current via transimpedance stage; provides clean digital alert signal. Use Value: Open-drain output interfaces directly to MCU's 3.3V GPIO; micropower operation extends 10-year alarm battery life. |
Use Scenario: Pulse oximeter saturation alert when SpO₂ falls below 90% threshold. IC Role / Device Role / Timing Role: Compares analog output of ADC or analog front-end against programmable threshold voltage. Use Value: Rail-to-rail input accommodates full 0–3.3V ADC output range; SC70-5 enables integration into pen-sized diagnostic tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDCKR | Lower 360nA IQ, but 15mV VOS max and no rail-to-rail input - limited common-mode range at low VCC. | Better for <1µA battery life; unsuitable for ground-sensing or high-side sensing below 1V. | Select TLV3691IDCKR only when ultra-low IQ dominates over input range requirements. |
| MAX9021AXK+T | Same SC70-5 package, 1.2µA IQ, but push-pull output and 20mV VOS max - no external pull-up needed, but no wired-OR capability. | Preferred where deterministic logic levels are required and bus sharing is unnecessary. | Choose MAX9021AXK+T if system lacks pull-up resources and does not require multi-sensor OR-ing. |
Compared with TLV3691IDCKR and MAX9021AXK+T, the MAX985EXK-T uniquely balances rail-to-rail input, open-drain flexibility, and sub-2µA power - making it optimal for ground-referenced sensing with shared interrupt lines in space-constrained, battery-operated systems.
Availability
MAX985EXK-T is available at Aetrix Electronics and suitable for battery voltage monitoring, temperature threshold detection, smoke detector sensor interfaces, and portable medical sensor alerts requiring stable component supply and long-term lifecycle support.
Supply support for MAX985EXK-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, mixed-signal, and power-management ICs for industrial, medical, and consumer applications.
The MAX985EXK-T belongs to Maxim's micropower comparator product line, engineered specifically for ultra-low-power, rail-to-rail sensing in battery-critical portable systems.
FAQ
What is the maximum operating temperature range for the MAX985EXK-T?
The MAX985EXK-T is specified for operation from –40°C to +85°C ambient temperature. Its quiescent current remains ≤2.5µA across this full range, and input offset voltage stays within ±10mV. This makes the MAX985EXK-T suitable for outdoor sensor nodes and industrial handheld devices where thermal extremes are encountered.
Does the MAX985EXK-T include internal hysteresis?
No, the MAX985EXK-T does not include internal hysteresis. Its input stage is a basic CMOS comparator with no built-in positive feedback. To prevent oscillation near threshold in noisy environments, external hysteresis must be added using a feedback resistor from OUT to IN+. The MAX985EXK-T's open-drain output simplifies this implementation by allowing direct resistor connection without level-shifting concerns.
Can the MAX985EXK-T operate from a 2.5V supply while maintaining rail-to-rail input performance?
Yes, the MAX985EXK-T fully supports rail-to-rail input operation down to 2.5V supply. Its input common-mode range extends from VEE – 0.1V to VCC + 0.1V, meaning it accepts signals from 0V to 2.6V at 2.5V VCC. This capability is confirmed in the official MAX985 datasheet and enables direct interfacing with 2.5V ADC references or resistive dividers without attenuation or biasing networks.
Is the MAX985EXK-T pin-compatible with other SC70-5 comparators like the MAX9021AXK+T?
No, the MAX985EXK-T is not pin-compatible with the MAX9021AXK+T. Although both use SC70-5 packaging, their pinouts differ: MAX985EXK-T assigns IN– to Pin 1 and IN+ to Pin 2, while MAX9021AXK+T swaps these inputs (IN+ on Pin 1, IN– on Pin 2). PCB layout must be verified per each device's datasheet - no mechanical or electrical drop-in replacement is possible without redesign.
What is the recommended bypass capacitor for the MAX985EXK-T VCC pin?
A 0.1µF ceramic capacitor placed as close as possible to the MAX985EXK-T VCC (Pin 5) and GND (Pin 3) is required for stable operation. This capacitor suppresses high-frequency supply noise that could couple into the comparator's sensitive input stage and cause false triggering. X7R or C0G dielectrics are preferred; placement within 2mm of the pins is critical due to the SC70-5 package's small pad size and high-frequency susceptibility.
MAX985EXK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 5.5V, ±1.25V ~ 2.75V
- :
- 5mV @ 5.5V
- Voltage - Input Offset (Max):
- 1pA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 24µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 450ns
- Propagation Delay (Max):
- ±3mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SC-70-5
MAX985EXK-T FAQ
1.How can I place an order for MAX985EXK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX985EXK-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 MAX985EXK-T reliable?
The price and inventory of MAX985EXK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX985EXK-T is usually 5 days.
3.What payment methods are accepted for MAX985EXK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX985EXK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX985EXK-T?
MAX985EXK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX985EXK-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 MAX985EXK-T?
For technical support, including MAX985EXK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX985EXK-T requirements.
6.How does Aetrix verify that MAX985EXK-T is sourced from the original manufacturer or authorized distributors?
All MAX985EXK-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 MAX985EXK-T meets industry standards.
7.What is the process for return or replacement of MAX985EXK-T?
All MAX985EXK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX985EXK-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 MAX985EXK-T part is unused and in its original packaging.
Return procedure for MAX985EXK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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