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Analog Devices Inc./Maxim Integrated MAX9042AEUA
- Part No.:
- MAX9042AEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX9042AEUA.pdf
- Description:
- IC COMPARATOR 2 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,084
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Product details
Overview
MAX9042AEUA from Analog Devices is a dual micropower comparator with integrated 2.048V precision voltage reference, operating from 2.5V to 5.5V single supply. It delivers rail-to-rail inputs/outputs, 400ns propagation delay, ±3mV internal hysteresis, and only 55µA supply current - ideal for battery-powered precision level detection in portable instrumentation.
For engineers reviewing the MAX9042AEUA datasheet, MAX9042AEUA pinout, MAX9042AEUA application, or MAX9042AEUA equivalent, key selection criteria include its dual-comparator + reference integration in µMAX-8, A-grade (±0.4% VREF accuracy, 6ppm/°C tempco), rail-to-rail output drive (±8mA), and low-noise reference stability under capacitive loads up to 4.7nF.
Technical Context
The MAX9042AEUA integrates two independent comparators sharing one laser-trimmed, curvature-corrected 2.048V series-mode reference. Its input stage supports common-mode range from (VEE − 0.25V) to (VCC + 0.25V), with typical 1.0pA input bias current and ±0.5mV offset voltage. Each comparator features internal ±3mV hysteresis and push-pull rail-to-rail outputs.
The reference section provides stable 2.048V output with ±0.4% initial accuracy (A grade), 6ppm/°C typical temperature coefficient, <105µVRMS noise (10Hz–10kHz), and full stability with 0–4.7nF capacitive loads. Reference load regulation is 2–4µV/µA sourcing and 3.5–6µV/µA sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V - supports both 3V and 5V systems without level-shifting circuitry |
| Supply Current | 55µA typical at VCC = 2.7V - enables multi-year battery life in always-on sensing nodes |
| Reference Voltage | 2.048V ±0.4% (A grade) - matches standard 12-bit DAC full-scale codes (2.048V = 1 LSB × 211) |
| Propagation Delay | 400ns at 100mV overdrive - sufficient for >1MHz window comparator timing in power monitoring |
| Input Offset Voltage | ±0.5mV typical - ensures sub-millivolt threshold resolution in precision battery voltage windows |
| Output Drive | Rail-to-rail push-pull, ±8mA - directly interfaces with 3.3V/5V logic families or drives small LEDs without external buffers |
| Reference Tempco | 6ppm/°C typical - drift < ±0.5mV over −40°C to +85°C, critical for industrial sensor calibration stability |
Pinout & Package
MAX9042AEUA is housed in an 8-pin µMAX package (pin-compatible with SO-8 but 30% smaller footprint). The package uses exposed pad thermal enhancement and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Comparator A Output | Rail-to-rail push-pull output capable of sinking/source 8mA; no external pull-up required |
| 2 (INA+) | Comparator A Noninverting Input | High-impedance node (1pA bias); accepts signals 0.25V beyond rails for direct sensor interface |
| 3 (INB−) | Comparator B Inverting Input | Uncommitted input - configurable as inverting or noninverting via external feedback |
| 4 (VEE) | Negative Supply | Ground reference for single-supply operation; also serves as comparator output low-level reference |
| 5 (VCC) | Positive Supply | 2.5V–5.5V input; powers both comparators and reference; bypass capacitor recommended |
| 6 (REF) | Precision Reference Output | 2.048V ±0.4%, stable with 0–4.7nF load; supplies reference for both comparators and external circuits |
| 7 (INB+) | Comparator B Noninverting Input | Independent high-Z input; enables dual-threshold or window comparator configurations |
| 8 (OUTB) | Comparator B Output | Independent rail-to-rail output; allows asynchronous dual-triggering (e.g., over/under-voltage flags) |
Key Features
| Feature | Design Value |
|---|---|
| Dual comparator + precision reference integration | Eliminates discrete reference IC and layout area; reduces BOM count by ≥3 components in battery monitor designs |
| Rail-to-rail input common-mode range | Extends 250mV beyond supply rails - enables direct connection to sensors or ADCs without level-shifting resistors |
| Ultra-low 55µA supply current | Reduces quiescent power to 137.5µW at 2.5V - extends coin-cell lifetime beyond 10 years in wake-on-event systems |
| Internal ±3mV hysteresis | Prevents chatter on slow-moving signals (e.g., thermistor outputs) without external positive feedback resistors |
| Reference stability with 4.7nF load | Allows direct connection to ADC reference inputs or large decoupling caps without oscillation risk |
| Low 400ns propagation delay | Supports real-time fault response in DC-DC converter overvoltage protection (<2.5µs total loop latency) |
Applications
| Battery Cell Voltage Monitoring | Industrial Sensor Threshold Detection |
|---|---|
Use Scenario: Monitoring individual Li-ion cell voltages in 4S battery packs to trigger charge/discharge cutoff at 4.2V/2.8V thresholds. IC Role / Device Role / Timing Role: Dual comparator compares cell voltage against 2.048V reference scaled by resistor dividers; OUTA flags overvoltage, OUTB flags undervoltage. Use Value: Integrated reference eliminates matching drift between separate reference and comparator, ensuring ±5mV total threshold error across temperature. | Use Scenario: Detecting out-of-range output from 4–20mA current-loop pressure transmitters in PLC analog input modules. IC Role / Device Role / Timing Role: One comparator monitors upper limit (e.g., 22mA), second monitors lower limit (e.g., 3.5mA); REF supplies precise 2.048V for I-to-V conversion scaling. Use Value: 6ppm/°C reference tempco maintains <±0.1% full-scale accuracy over −40°C to +85°C ambient, meeting IEC 61000-6-2 immunity requirements. |
| Optical Receiver Signal Conditioning | Microcontroller Wake-Up Comparator |
Use Scenario: Converting low-amplitude, noisy IR receiver diode outputs into clean digital pulses for remote control decoding. IC Role / Device Role / Timing Role: Comparator A processes signal envelope; comparator B monitors ambient light baseline; REF sets adaptive threshold via resistor network. Use Value: 1pA input bias prevents loading of high-impedance photodiode preamp outputs, preserving signal-to-noise ratio. | Use Scenario: Waking an ultra-low-power MCU from deep sleep when external sensor voltage crosses programmable thresholds. IC Role / Device Role / Timing Role: Dual comparators generate interrupt signals (OUTA/OUTB) to MCU GPIO pins; REF provides stable wake-up voltage independent of VCC droop. Use Value: 55µA quiescent current enables continuous monitoring while consuming less than 0.1% of typical MCU sleep current (50µA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator + reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9042BEUA | B-grade reference: ±1% initial accuracy, 100ppm/°C tempco vs. A-grade's ±0.4%/6ppm | Acceptable for cost-sensitive consumer devices where <±10mV reference drift is tolerable | Select MAX9042BEUA only if system-level calibration compensates for reference inaccuracy and tempco |
| TLV3602IDR | No integrated reference; requires external 2.048V reference (e.g., REF3020); higher 85µA supply current | Suitable when reference must be shared across multiple comparators or ADCs on same board | Choose TLV3602IDR when design already includes a precision reference rail; avoid if minimizing component count is priority |
Compared with MAX9042BEUA, the MAX9042AEUA provides tighter reference accuracy and lower tempco for applications demanding long-term calibration stability; compared with TLV3602IDR, it reduces total solution size and power by integrating the reference, though at the cost of fixed 2.048V output.
Availability
MAX9042AEUA is available at Aetrix Electronics and suitable for battery management systems, industrial sensor interfaces, optical receiver front-ends, and microcontroller wake-up circuits requiring stable component supply across extended temperature ranges.
Supply support for MAX9042AEUA 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX9038–MAX9053 family was designed specifically for space-constrained, battery-operated systems requiring precision voltage comparison with minimal quiescent power - targeting portable medical devices, IoT edge sensors, and energy-harvesting applications.
FAQ
What is the reference voltage tolerance and temperature coefficient of the MAX9042AEUA?
The MAX9042AEUA features an A-grade 2.048V precision reference with ±0.4% initial accuracy over temperature and a typical temperature coefficient of 6ppm/°C. This specification is guaranteed across the full −40°C to +85°C operating range and enables stable threshold setting in battery voltage monitors without recalibration.
Can the MAX9042AEUA operate from a 2.5V supply, and what is its supply current at that voltage?
Yes, the MAX9042AEUA operates from 2.5V to 5.5V single supply. At VCC = 2.5V, its typical supply current is 55µA - identical to the value specified at 2.7V per the datasheet's electrical characteristics table, confirming robust low-voltage functionality for coin-cell powered designs.
Does the MAX9042AEUA require an external capacitor on the REF pin for stability?
No, the MAX9042AEUA reference output is unconditionally stable with capacitive loads from 0 to 4.7nF. An external capacitor is optional and only beneficial in transient-heavy environments (e.g., switching power supply rails) to reduce overshoot; it is not required for basic DC precision applications.
What are the absolute maximum ratings for the IN+ and IN− pins of the MAX9042AEUA?
The MAX9042AEUA input pins tolerate voltages from (VEE − 0.3V) to (VCC + 0.3V). Exceeding this range forward-biases internal ESD diodes, causing exponential increase in input bias current; operation beyond (VEE − 0.25V) or (VCC + 0.25V) is outside the guaranteed common-mode range but within absolute max limits.
How does the internal hysteresis of the MAX9042AEUA affect its use in window comparator configurations?
The MAX9042AEUA includes fixed ±3mV internal hysteresis per comparator, which prevents oscillation on slow or noisy inputs. In window comparator use, this hysteresis defines the dead band between upper and lower thresholds - for example, with 2.048V reference and 2:1 resistor dividers, the effective window width increases by ~6mV, simplifying noise-immune design without external hysteresis resistors.
MAX9042AEUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 2
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 5.5V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 1pA @ 5V
- Current - Input Bias (Max):
- 8mA
- Current - Output (Typ):
- 85µA
- 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
- :
- 8-uMAX/uSOP
MAX9042AEUA FAQ
1.How can I place an order for MAX9042AEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9042AEUA 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 MAX9042AEUA reliable?
The price and inventory of MAX9042AEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9042AEUA is usually 5 days.
3.What payment methods are accepted for MAX9042AEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9042AEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9042AEUA?
MAX9042AEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9042AEUA 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 MAX9042AEUA?
For technical support, including MAX9042AEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9042AEUA requirements.
6.How does Aetrix verify that MAX9042AEUA is sourced from the original manufacturer or authorized distributors?
All MAX9042AEUA 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 MAX9042AEUA meets industry standards.
7.What is the process for return or replacement of MAX9042AEUA?
All MAX9042AEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX9042AEUA, 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 MAX9042AEUA part is unused and in its original packaging.
Return procedure for MAX9042AEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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