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Analog Devices Inc./Maxim Integrated MAX9027EWT+
- Part No.:
- MAX9027EWT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX9027EWT+.pdf
- Description:
- UCSP, 1.8V, NANOPOWER, BEYOND-TH
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
MAX9027EWT+ from Maxim Integrated is a nanopower, single comparator with push-pull output, no internal reference, and Beyond-the-Rails™ input capability. It operates from +1.8V to +5.5V, draws only 0.6µA supply current at 1.8V, features 4mV internal hysteresis, and delivers rail-to-rail output swing up to ±5mA - ideal for 2-cell battery monitoring in portable medical instruments and telemetry systems.
For engineers reviewing the MAX9027EWT+ datasheet, MAX9027EWT+ pinout, MAX9027EWT+ application, or MAX9027EWT+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated UCSP package mapping, confirmed pin functions, and two rigorously cross-checked alternative parts for low-power comparator selection.
Technical Context
The MAX9027EWT+ employs a BiCMOS process with 209 transistors and uses a break-before-make output stage that eliminates crowbar current during switching - reducing supply glitches and dynamic power consumption. Its input common-mode range extends from VEE − 0.2V to VCC + 0.2V, enabling sensing at ground or supply line without level-shifting.
It features fixed 4mV input-referred hysteresis (typical), no phase reversal under overdrive, and CMOS push-pull output capable of sourcing/sinking ±5mA. Propagation delay is 14µs (high-to-low) and 40µs (low-to-high) at VCC = 5V with 15pF load - optimized for ultra-low-power, slow-signal detection rather than high-speed comparison.
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 (3.0–3.5V) batteries without regulation. |
| Supply Current | 0.6µA typical at 1.8V - enables >2.8 million hours (320+ years) of continuous operation on a 2000mAh AA battery. |
| Input Offset Voltage | 10mV max over temperature - sets minimum detectable differential voltage without external trimming. |
| Input Common-Mode Range | VEE − 0.2V to VCC + 0.2V - allows direct sensing of signals referenced to ground or VCC in battery-powered systems. |
| Output Drive | ±5mA rail-to-rail push-pull - drives logic inputs, LEDs, or small MOSFET gates directly without external buffers. |
| Propagation Delay | 14µs (tPD−), 40µs (tPD+) at 5V/15pF - suitable for sub-10kHz signal monitoring (e.g., battery voltage ramp, temperature thresholds). |
| Internal Hysteresis | 4mV - prevents chatter on slow-moving inputs (e.g., thermistor outputs, battery discharge curves) without external components. |
Pinout & Package
MAX9027EWT+ is housed in a 6-bump wafer-level chip-scale package (UCSP™), measuring 1.0mm × 1.52mm with bumps on bottom. The package is RoHS-compliant and designed for reflow soldering per Maxim's UCSP profile (peak 235°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin A1) | Positive supply input | Accepts 1.8V–5.5V; bypass capacitor recommended if supply impedance >1Ω or trace length >10mm. |
| VEE (Pin A3) | Negative supply input / ground reference | Must be connected to system ground; supports true ground-referenced input sensing. |
| IN+ (Pin B1) | Noninverting input | Accepts voltages from VEE − 0.2V to VCC + 0.2V; bias current ≤2nA minimizes loading on high-Z sources. |
| IN− (Pin B3) | Inverting input | Same common-mode range as IN+; used for threshold comparison against IN+ or vice versa. |
| OUT (Pin A2) | CMOS push-pull output | Sources/sinks up to ±5mA; swings rail-to-rail; no external pull-up required for logic interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Beyond-the-Rails™ input | Enables direct sensing of signals below ground or above VCC - e.g., battery cell voltage monitoring without resistive dividers. |
| Crowbar-current-free switching | Eliminates supply current spikes during output transitions - reduces need for large decoupling capacitors in space-constrained PCBs. |
| Internal 4mV hysteresis | Prevents oscillation on noisy or slowly varying inputs (e.g., thermistor networks), removing need for external feedback resistors. |
| Rail-to-rail push-pull output | Drives CMOS/TTL loads directly; compatible with 1.8V, 3.3V, and 5V logic families without level shifters. |
| 0.6µA supply current at 1.8V | Extends battery life in always-on monitoring applications - e.g., remote sensor nodes operating for >10 years on coin cells. |
Applications
| 2-Cell Battery Monitoring | Ultra-Low-Power Telemetry |
|---|---|
Use Scenario: Monitoring voltage of two-series alkaline or NiMH cells in portable diagnostic equipment. IC Role / Device Role / Timing Role: Comparator detecting end-of-life threshold (e.g., 1.8V/cell) with hysteresis to prevent false triggers during load transients. Use Value: Enables accurate, glitch-free battery cutoff using only 0.6µA quiescent current - preserving >99.9% of battery capacity for primary functions. |
Use Scenario: Wake-up trigger for wireless sensor nodes based on environmental threshold crossing (e.g., temperature rise >2°C). IC Role / Device Role / Timing Role: Low-power analog front-end comparator generating interrupt signal to microcontroller sleep mode exit. Use Value: Delivers reliable wake-up with <1µA total system standby current - extending field deployment from months to years. |
| Medical Instrument Sensing | Ground-Referenced Signal Detection |
Use Scenario: Detecting zero-crossing or amplitude thresholds in ECG/EEG front-end signal paths. IC Role / Device Role / Timing Role: Precision comparator conditioning analog biosignals before ADC sampling, operating from same low-noise LDO as analog chain. Use Value: Maintains signal integrity with no phase reversal and minimal supply coupling - critical for clinical-grade waveform fidelity. |
Use Scenario: Monitoring current sense resistor voltage drop referenced to system ground in battery protection circuits. IC Role / Device Role / Timing Role: High-accuracy comparator rejecting common-mode noise while resolving mV-level shunt voltages. Use Value: Achieves stable trip points without level-shifting circuitry - reducing BOM count and PCB area in compact wearable designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanopower comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3691IDCKR | 0.55µA supply current, 1.8V min, open-drain output, no hysteresis | Requires external hysteresis network; unsuitable for direct logic drive without pull-up | Select when lowest possible current (<0.6µA) is critical and open-drain interface is acceptable |
| MAX40002ANA+T | 0.9µA supply current, 1.6V min, push-pull output, 6.5mV hysteresis, SC70-5 package | Larger footprint (2.0mm × 2.1mm); higher current but wider VCC range and stronger hysteresis | Select when tighter trip-point stability (6.5mV vs. 4mV) and extended 1.6V operation outweigh size constraints |
Compared with TLV3691IDCKR and MAX40002ANA+T, the MAX9027EWT+ uniquely balances ultra-low 0.6µA current, integrated 4mV hysteresis, push-pull drive, and 1.0mm × 1.52mm UCSP footprint - making it optimal for space- and energy-constrained 2-cell battery systems where board area and self-powered reliability are paramount.
Availability
MAX9027EWT+ is available at Aetrix Electronics and suitable for 2-cell battery monitoring, ultra-low-power telemetry, and medical instrument sensing requiring stable component supply across long-lifecycle industrial and healthcare programs.
Supply support for MAX9027EWT+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX9025–MAX9028 family was designed specifically for nanopower, rail-aware sensing in battery-critical systems - delivering guaranteed 1.8V operation, Beyond-the-Rails™ inputs, and glitch-free switching in chip-scale packaging.
FAQ
What is the operating voltage range for MAX9027EWT+?
The MAX9027EWT+ operates from +1.8V to +5.5V. This range is fully specified over temperature (−40°C to +85°C), enabling direct connection to two-series alkaline (1.8V–3.0V), lithium coin cell (2.0V–3.0V), or regulated 3.3V/5V rails without additional voltage translation. The 1.8V minimum ensures functionality even at end-of-life battery voltage.
Does MAX9027EWT+ include an internal voltage reference?
No, the MAX9027EWT+ does not include an internal voltage reference. It belongs to the reference-less variant of the MAX9025–MAX9028 family (alongside MAX9028). Reference functionality is provided only in MAX9025/MAX9026. The MAX9027EWT+ relies on external threshold sources - such as resistor dividers or sensor outputs - for comparison.
What is the function of the REF pin on MAX9027EWT+?
The MAX9027EWT+ has no REF pin. Unlike MAX9025/MAX9026, which feature a dedicated REF output (1.236V ±1%), the MAX9027EWT+ omits this pin entirely. Its 6-bump UCSP pinout consists only of VCC, VEE, IN+, IN−, and OUT - confirmed by Maxim's official pin configuration diagram and ordering information table.
Can MAX9027EWT+ drive a 5mA load rail-to-rail?
Yes, the MAX9027EWT+ push-pull output is specified to source and sink up to ±5mA while maintaining rail-to-rail swing - e.g., VOL ≤300mV at ISINK = 1mA (VCC = 1.8V) and VOH ≥VCC − 400mV at ISOURCE = 5mA (VCC = 5V). This allows direct driving of LEDs, small MOSFET gates, or logic inputs without external buffers.
Is MAX9027EWT+ suitable for zero-crossing detection?
Yes, the MAX9027EWT+ is well-suited for zero-crossing detection. Its Beyond-the-Rails™ inputs accept signals down to VEE − 0.2V (i.e., −0.2V with VEE = GND), enabling direct connection of AC-coupled signals to IN+ or IN−. Combined with internal hysteresis and no phase reversal, it delivers clean, chatter-free transitions - as demonstrated in Maxim's Figure 4 application circuit.
MAX9027EWT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
MAX9027EWT+ FAQ
1.How can I place an order for MAX9027EWT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9027EWT+ 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 MAX9027EWT+ reliable?
The price and inventory of MAX9027EWT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9027EWT+ is usually 5 days.
3.What payment methods are accepted for MAX9027EWT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9027EWT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9027EWT+?
MAX9027EWT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9027EWT+ 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 MAX9027EWT+?
For technical support, including MAX9027EWT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9027EWT+ requirements.
6.How does Aetrix verify that MAX9027EWT+ is sourced from the original manufacturer or authorized distributors?
All MAX9027EWT+ 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 MAX9027EWT+ meets industry standards.
7.What is the process for return or replacement of MAX9027EWT+?
All MAX9027EWT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9027EWT+, 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 MAX9027EWT+ part is unused and in its original packaging.
Return procedure for MAX9027EWT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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