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Analog Devices Inc./Maxim Integrated MAX942AUA+
- Part No.:
- MAX942AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX942AUA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,790
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Product details
Overview
MAX942AUA+ 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 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 MAX942AUA+ datasheet, MAX942AUA+ pinout, MAX942AUA+ application, or MAX942AUA+ equivalent, key selection criteria include input offset voltage (1–4mV), common-mode range extending beyond rails, output swing within 0.4V of V+ and GND, and μMAX-8 package compatibility with space-constrained designs.
Technical Context
The MAX942AUA+ implements a bipolar-input comparator architecture with internal hysteresis (input-referred hysteresis zone width ≤4mV at TMIN–TMAX), enabling clean switching on slow-moving signals without external components. Its rail-to-rail input stage supports common-mode voltages from –0.2V to V+ + 0.2V, and its current-driven output stage delivers VOH = V+ – 0.2V (ISOURCE = 400μA) and VOL = 0.2V (ISINK = 400μA).
Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns - critical for matched timing in dual-channel applications like zero-crossing detection and sampling circuits. The device tolerates continuous short-circuit faults on all I/O pins to either rail and features ESD protection per JEDEC JS-001.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into Li-ion (3.0–3.7V) and USB-powered (5V) systems without regulation. |
| Propagation Delay | 80ns (typ) at 5mV overdrive - enables reliable sampling of >10MHz analog signals with deterministic timing. |
| Input Offset Voltage | 1mV (typ), ≤4mV (max, –40°C to +125°C) - ensures accurate threshold detection down to millivolt-level signal differentials. |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows interface with sensors or DACs operating outside supply rails, e.g., ±100mV transducer outputs. |
| Output Swing | VOL = 0.2V / VOH = V+ – 0.2V (at 400μA) - directly drives 3.3V CMOS logic without level-shifting or pull-up resistors. |
| Supply Current | 350μA per comparator (typ at 3V) - enables dual-comparator operation in ultra-low-power wake-up circuits (<1mW total). |
| Common-Mode Rejection | 80μV/V (min) - maintains stable trip points despite supply ripple or ground bounce up to 100mVpp. |
Pinout & Package
The MAX942AUA+ is housed in an 8-pin μMAX® package (0.11" × 0.11", 0.05" pitch), compatible with fine-pitch PCB assembly and offering thermal resistance θJA = 244°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Dual open-drain–like CMOS output; sinks or sources current to V+ or GND without external pull-ups. |
| 2 | INA− | Inverting input; accepts rail-to-rail common-mode signals and withstands continuous short to V+ or GND. |
| 3 | INA+ | Noninverting input; identical electrical specs to INA−; paired with INA− for comparator A function. |
| 4 | V+ | Positive supply pin; must be ≤6.5V; requires local 0.1μF ceramic decoupling placed <2mm from pin. |
| 5 | INB+ | Noninverting input for comparator B; electrically isolated from comparator A; matches INA+ performance. |
| 6 | INB− | Inverting input for comparator B; same fault-tolerant design as INA−; enables independent dual-threshold monitoring. |
| 7 | OUTB | Comparator B output; fully independent timing path; skew ≤10ns vs. OUTA under matched load conditions. |
| 8 | GND | Analog/digital ground reference; must connect to low-impedance ground plane to maintain 80ns propagation integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Supports sensor inputs down to –0.2V or up to V+ + 0.2V - eliminates need for input biasing networks in single-supply systems. |
| Internal hysteresis | Fixed input-referred hysteresis zone (≤4mV max) - prevents oscillation on noisy or slowly varying signals without external resistors. |
| CMOS/TTL-compatible outputs | VOH/VOL meet 3.3V CMOS VIH/VIL thresholds across temperature - enables direct connection to microcontroller GPIOs or FPGA I/O banks. |
| Short-circuit tolerant I/O | All pins survive continuous short to V+ or GND - simplifies robustness testing and improves field reliability in industrial interfaces. |
| Low 350μA/comparator supply current | Enables always-on dual-comparator monitoring in battery-operated devices with multi-year shelf life (e.g., smart sensor nodes). |
Applications
| Battery-Powered Threshold Detection | High-Speed Line Receiver |
|---|---|
Use Scenario: Monitoring battery cell voltage against low- and over-voltage thresholds in portable medical devices. IC Role / Device Role / Timing Role: Dual comparator independently compares cell voltage to two precision references (e.g., 2.5V and 4.2V) to trigger shutdown or alert signals. Use Value: 1mV offset and rail-to-rail input enable accurate detection at end-of-discharge (2.7V) and full-charge (4.2V) without signal conditioning. | Use Scenario: Converting differential RS-422/RS-485 bus signals to single-ended logic levels for MCU input. IC Role / Device Role / Timing Role: Comparator A detects rising edge on D+ line; Comparator B detects falling edge on D− line - providing noise-immune digital recovery. Use Value: 80ns propagation delay and ≤10ns channel skew preserve data eye integrity at 10Mbps baud rates. |
| Zero-Crossing Detector | Sampling Circuit Trigger |
Use Scenario: Detecting AC mains zero crossings for phase-controlled dimming in smart lighting controllers. IC Role / Device Role / Timing Role: One comparator channel monitors rectified AC waveform; internal hysteresis rejects 50/60Hz noise and contact bounce. Use Value: Input common-mode range extending below GND allows direct connection to transformer-coupled AC inputs without DC biasing. | Use Scenario: Generating precise sample-enable pulses for ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Comparator B triggers ADC conversion when analog input crosses programmable threshold set by DAC output. Use Value: 350μA supply current and 80ns delay allow synchronous sampling at 10MSps with minimal power overhead per channel. |
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 propagation), higher offset (2mV typ), no rail-to-rail inputs, 1mA supply current. | Suitable only for DC or sub-10kHz threshold detection; cannot interface directly with low-voltage sensors or 3.3V logic without level shifters. | Select LM393DR only for cost-sensitive, non-high-speed applications where power and input range are not constraints. |
| TLV3502IDR | Faster (4.5ns), lower power (45μA), rail-to-rail inputs/outputs, but rated only to +85°C (vs. +125°C for MAX942AUA+). | Preferred for high-frequency (>100MHz) sampling or portable consumer gear; unsuitable for under-hood automotive or industrial control environments. | Choose TLV3502IDR when speed and ultra-low power dominate; retain MAX942AUA+ for extended temperature reliability and proven robustness in harsh EMI environments. |
Compared with LM393DR and TLV3502IDR, the MAX942AUA+ uniquely balances 80ns speed, 350μA efficiency, rail-to-rail operation, and –40°C to +125°C qualification - making it optimal for industrial sensing and battery-powered instrumentation where all four attributes are simultaneously required.
Availability
MAX942AUA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors/discriminators, and line receivers requiring stable component supply across automotive, industrial, and medical device production cycles.
Supply support for MAX942AUA+ 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, interface, and timing applications in industrial, medical, and communications systems.
The MAX941/MAX942/MAX944 family was engineered specifically for high-speed, low-power, single-supply comparator functions in portable and energy-conscious systems - emphasizing rail-to-rail operation, internal hysteresis, and robust I/O fault tolerance.
FAQ
What is the maximum operating temperature range for the MAX942AUA+?
The MAX942AUA+ is specified for operation from –40°C to +125°C. This extended temperature grade is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, making it suitable for under-hood automotive, industrial motor control, and outdoor equipment applications where ambient temperatures exceed +85°C.
Does the MAX942AUA+ require external pull-up resistors on its outputs?
No, the MAX942AUA+ does not require external pull-up resistors. Its outputs are designed to actively drive to within 0.2V of V+ (VOH) and 0.2V of GND (VOL) at 400μA load, meeting CMOS/TTL logic thresholds directly. This capability is explicitly stated in the Electrical Characteristics table under "Output High/Low Voltage" and validated across the full temperature range.
Can the MAX942AUA+ operate from a 2.7V supply?
Yes, the MAX942AUA+ is fully specified to operate from 2.7V to 5.5V. The Electrical Characteristics table lists V+ = 2.7V as the minimum supply voltage, and parameters including propagation delay (80ns), supply current (350μA), and input offset voltage (1–4mV) are guaranteed across this range - enabling direct use with single-cell Li-ion batteries.
Is the MAX942AUA+ pin-compatible with other MAX942 variants in the μMAX package?
Yes, all MAX942 variants in the 8-pin μMAX package - including MAX942EUA-T and MAX942AUA-T - share identical pinout, footprint, and solder pad layout per Maxim's Package Code U8-1 and Land Pattern No. 90-0092. This allows drop-in replacement across temperature grades without PCB redesign.
What is the input common-mode voltage range of the MAX942AUA+?
The input common-mode voltage range of the MAX942AUA+ extends from –0.2V to V+ + 0.2V, as specified in the Electrical Characteristics table under "Input Voltage Range (VCMR)". This rail-to-rail-plus margin enables direct interfacing with transducers, DACs, or op-amp outputs that swing slightly beyond the supply rails - a key advantage over standard comparators.
MAX942AUA+ 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:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX942AUA+ FAQ
1.How can I place an order for MAX942AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942AUA+ 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 MAX942AUA+ reliable?
The price and inventory of MAX942AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942AUA+ is usually 5 days.
3.What payment methods are accepted for MAX942AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942AUA+?
MAX942AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942AUA+ 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 MAX942AUA+?
For technical support, including MAX942AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942AUA+ requirements.
6.How does Aetrix verify that MAX942AUA+ is sourced from the original manufacturer or authorized distributors?
All MAX942AUA+ 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 MAX942AUA+ meets industry standards.
7.What is the process for return or replacement of MAX942AUA+?
All MAX942AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX942AUA+, 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 MAX942AUA+ part is unused and in its original packaging.
Return procedure for MAX942AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942AUA+ Tags
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LM239DR
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