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Analog Devices Inc./Maxim Integrated MAX942CUA+
- Part No.:
- MAX942CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX942CUA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
MAX942CUA+ from Maxim Integrated is a dual high-speed comparator optimized for 3V/5V single-supply systems, featuring rail-to-rail inputs, 80ns propagation delay (5mV overdrive), 350μA per comparator supply current, and CMOS/TTL-compatible push-pull outputs. It operates from 2.7V to 5.5V and is used in battery-powered threshold detection and line receiver circuits.
For engineers reviewing the MAX942CUA+ datasheet, MAX942CUA+ pinout, MAX942CUA+ application, or MAX942CUA+ equivalent, key selection criteria include input common-mode range extending beyond rails, internal hysteresis for noise immunity, output swing within 0.4V of V+ and GND, and μMAX-8 package compatibility with space-constrained portable designs.
Technical Context
The MAX942CUA+ implements a bipolar process-based comparator core with internal hysteresis (1mV typical input-referred width), enabling clean switching on slow-moving or noisy signals without external feedback components. Its rail-to-rail input stage accepts voltages from –0.2V to V+ + 0.2V, and its current-driven output stage delivers VOH = V+ – 0.2V (at 400μA) and VOL = 0.2V (at 400μA).
As a dual-channel device, it guarantees matched propagation delay skew ≤10ns between channels and differential propagation delay ≤10ns, supporting precise timing-critical applications like zero-crossing detection and sampling circuits where channel-to-channel consistency is essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports direct operation from Li-ion (3.3V) and 5V logic rails without regulation. |
| Propagation Delay | 80ns (typical, 5mV overdrive) - enables >10MHz signal discrimination in real-time control loops. |
| Input Offset Voltage | 1mV (typ, TA = +25°C), 3mV (max, –40°C to +85°C) - ensures accurate threshold detection down to millivolt-level differentials. |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows interface with sensors or DACs operating outside supply rails without level-shifting. |
| Output Swing | VOL = 0.2V / VOH = V+ – 0.2V (at 400μA) - directly drives CMOS/TTL inputs without pull-up resistors. |
| Supply Current | 350μA per comparator (typ, V+ = 3V) - enables ultra-low-power operation in always-on monitoring circuits. |
| Input Bias Current | 150–400nA (max, full temp range) - minimizes loading error on high-impedance sensor sources. |
Pinout & Package
MAX942CUA+ is housed in an 8-pin μMAX® package (U8-1 outline, 3mm × 3mm, 0.65mm pitch), specified for –40°C to +85°C operation. The package features exposed pad for thermal enhancement and is RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain compatible push-pull output - sinks/sours current to drive logic or analog loads directly. |
| 2 | INA− | Inverting input of Comparator A - accepts rail-to-rail common-mode voltage; tolerant of continuous short to either rail. |
| 3 | INA+ | Noninverting input of Comparator A - identical electrical specs to INA−; differential input clamp ±2.2V. |
| 4 | V+ | Positive supply pin - must be ≤6.5V above GND; decoupling capacitor required adjacent to pin. |
| 5 | INB+ | Noninverting input of Comparator B - electrically matched to INA+ for dual-channel synchronization. |
| 6 | INB− | Inverting input of Comparator B - shares same input stage architecture and protection diodes as INA−. |
| 7 | OUTB | Comparator B push-pull output - independent of OUTA; no cross-talk guaranteed by layout isolation. |
| 8 | GND | Analog ground reference - must connect to low-impedance PCB ground plane; shared return for both comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Operates with inputs up to 0.2V beyond V+ or below GND - eliminates need for external level shifters in mixed-voltage systems. |
| Internal hysteresis | 1mV typical input-referred hysteresis - prevents oscillation on slow edges or noisy inputs without external resistor networks. |
| CMOS/TTL-compatible outputs | Pull to within 0.2V of V+ or GND at 400μA - interfaces directly with 3.3V/5V logic families without external pull-ups. |
| Low quiescent current | 350μA per comparator at 3V - extends battery life in portable instrumentation and IoT endpoint sensors. |
| Channel matching | ≤10ns propagation delay skew between OUTA and OUTB - enables synchronized dual-threshold decisions in safety-critical monitoring. |
Applications
| Battery-Powered Threshold Detector | 3.3V Line Receiver |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.2V and pre-charge enable at 3.0V. IC Role / Device Role / Timing Role: Dual comparator performing simultaneous high/low threshold comparison with independent outputs. Use Value: Enables precise, low-power state machine control using only two comparators and no external hysteresis components. |
Use Scenario: Converting RS-485 differential signals to single-ended 3.3V logic levels in industrial gateways. IC Role / Device Role / Timing Role: High-speed line receiver with rail-to-rail input tolerance to handle common-mode noise up to ±2V. Use Value: Eliminates external biasing resistors and achieves <80ns decision latency for real-time protocol decoding. |
| Zero-Crossing Detector | Sampling Circuit Trigger |
|
Use Scenario: Detecting AC mains zero crossings in smart energy meters for synchronized ADC sampling. IC Role / Device Role / Timing Role: Comparator comparing sine wave against GND reference with internal hysteresis suppressing noise-induced false triggers. Use Value: Delivers jitter <10ns across temperature, ensuring phase-accurate sampling without software calibration. |
Use Scenario: Generating precise sample-enable pulses for SAR ADCs in data acquisition modules. IC Role / Device Role / Timing Role: Fast comparator converting analog trigger edge into clean digital strobe with minimal propagation delay variation. Use Value: Achieves sub-100ps timing uncertainty between analog event and digital capture window due to matched dual-channel delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Slower (300ns delay), higher supply current (1mA), no rail-to-rail inputs, no internal hysteresis. | Suitable for cost-sensitive, non-critical DC thresholding; not viable for AC zero-crossing or battery-sensitive designs. | Select LM393DR only when speed, power, and input range requirements are relaxed and external hysteresis can be added. |
| TLV3502IDR | Faster (4.5ns delay), lower offset (0.75mV), rail-to-rail I/O, but requires ≥2.7V supply and has higher quiescent current (1.3mA). | Better for high-frequency (>100MHz) pulse discrimination; less suitable for multi-day battery operation. | Choose TLV3502IDR when nanosecond response is mandatory and power budget allows >3× higher ICC than MAX942CUA+. |
Compared with LM393DR and TLV3502IDR, the MAX942CUA+ uniquely balances 80ns speed, 350μA ultra-low power, rail-to-rail inputs, and integrated hysteresis-making it optimal for portable, precision thresholding where both performance and energy efficiency are constrained.
Availability
MAX942CUA+ is available at Aetrix Electronics and suitable for battery-powered systems, 3V/5V industrial interfaces, and precision threshold detectors requiring stable component supply across extended temperature ranges.
Supply support for MAX942CUA+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX94x family was designed specifically for low-voltage, high-speed comparator applications in portable and energy-conscious systems-emphasizing rail-to-rail operation, micropower consumption, and robust input/output interfacing without external components.
FAQ
What is the operating temperature range for MAX942CUA+?
The MAX942CUA+ is rated for operation from –40°C to +85°C. This industrial temperature grade is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The "E" suffix in MAX942CUA+ denotes the –40°C to +85°C range, and the μMAX package is qualified across this full span. Thermal derating follows 4.1mW/°C above +70°C.
Does MAX942CUA+ have internal hysteresis, and how does it affect threshold accuracy?
Yes, MAX942CUA+ includes fixed internal hysteresis of approximately 1mV (input-referred). This hysteresis creates distinct upper and lower trip points (VTRIP+ and VTRIP−), preventing output oscillation on slow or noisy input transitions. While it slightly widens the effective threshold window, it eliminates the need for external hysteresis resistors and ensures reliable switching without user tuning.
Can MAX942CUA+ interface directly with 3.3V CMOS logic without pull-up resistors?
Yes. MAX942CUA+ outputs swing to within 0.2V of V+ (VOH) and 0.2V of GND (VOL) at 400μA load, meeting standard 3.3V CMOS VIH (≥2.0V) and VIL (≤0.8V) thresholds when powered from 3.3V. Its push-pull architecture eliminates reliance on external pull-ups, simplifying board layout and reducing component count.
What is the maximum supply voltage rating for MAX942CUA+?
The absolute maximum supply voltage for MAX942CUA+ is +6.5V referenced to GND, as stated in the Absolute Maximum Ratings table. Continuous operation is specified from 2.7V to 5.5V. Exceeding 5.5V may degrade long-term reliability, and operation above 6.5V risks permanent damage regardless of duration.
Is the μMAX package of MAX942CUA+ lead-free and RoHS-compliant?
Yes. The "+" suffix in MAX942CUA+ indicates RoHS-compliant packaging per Maxim Integrated's ordering conventions. The μMAX-8 package (U8-1 outline) uses lead-free terminations and conforms to EU RoHS Directive 2011/65/EU. Land pattern and footprint details are documented in Maxim's Package Information section (Outline No. 21-0036).
MAX942CUA+ 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:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Push-Pull, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.5V
- :
- 3mV @ 5.5V
- Voltage - Input Offset (Max):
- 0.15µA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 600µA
- Current - Quiescent (Max):
- 81.94dB CMRR, 81.94dB PSRR
- CMRR, PSRR (Typ):
- 80ns
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX942CUA+ FAQ
1.How can I place an order for MAX942CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942CUA+ 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 MAX942CUA+ reliable?
The price and inventory of MAX942CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942CUA+ is usually 5 days.
3.What payment methods are accepted for MAX942CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942CUA+?
MAX942CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942CUA+ 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 MAX942CUA+?
For technical support, including MAX942CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942CUA+ requirements.
6.How does Aetrix verify that MAX942CUA+ is sourced from the original manufacturer or authorized distributors?
All MAX942CUA+ 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 MAX942CUA+ meets industry standards.
7.What is the process for return or replacement of MAX942CUA+?
All MAX942CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX942CUA+, 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 MAX942CUA+ part is unused and in its original packaging.
Return procedure for MAX942CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942CUA+ Tags
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LM2903DR
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LM339DR
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LM339PWR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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LM393ADR
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NCX2200GMAZ
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