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Analog Devices Inc./Maxim Integrated MAX942AUA+T
- Part No.:
- MAX942AUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX942AUA+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,362
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Product details
Overview
MAX942AUA+T from Maxim Integrated is a dual high-speed rail-to-rail input comparator optimized for 3V/5V single-supply systems, featuring 80ns propagation delay, 350μA per comparator supply current, and ±0.2V input common-mode range beyond rails. It operates from −40°C to +125°C in an 8-pin μMAX package and interfaces directly with CMOS/TTL logic in battery-powered threshold detection circuits.
For engineers reviewing the MAX942AUA+T datasheet, MAX942AUA+T pinout, MAX942AUA+T application, or MAX942AUA+T equivalent, key selection criteria include guaranteed 80ns delay at 5mV overdrive, rail-to-rail input operation down to 2.7V, internal hysteresis for noise immunity, and output swing within 0.4V of V+ or GND without pullups.
Technical Context
The MAX942AUA+T implements a bipolar process comparator core with internal hysteresis (1mV typical input-referred width), enabling clean switching on slow-moving or noisy inputs without external feedback resistors. 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).
Designed for dual-channel operation, it exhibits matched propagation delay skew ≤10ns between channels and differential propagation delay ≤10ns. Input offset voltage is 1mV (typ) over temperature, and PSRR/CMRR exceed 80dB across the full common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 80ns (typ) at 5mV overdrive - enables reliable sampling at >10MHz clock rates |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into 3V and 5V logic domains |
| Input Common-Mode Range | −0.2V to V+ + 0.2V - allows sensing below GND or above V+ without level shifters |
| Supply Current per Comparator | 350μA (typ) at 3V - enables ultra-low-power operation in battery-critical applications |
| Output Voltage Swing | VOL = 0.2V / VOH = V+ − 0.2V at 400μA - ensures robust CMOS/TTL logic compatibility |
| Input Offset Voltage | 1mV (typ), 5.5mV (max) over −40°C to +125°C - maintains precision threshold detection across automotive temp range |
| Internal Hysteresis | 1mV (typ) input-referred - eliminates external hysteresis resistors and associated layout sensitivity |
Pinout & Package
MAX942AUA+T is housed in an 8-pin μMAX package (U8-1 outline, 3mm × 3mm, 0.65mm pitch), specified for −40°C to +125°C operation. The package features exposed pad for thermal enhancement and RoHS-compliant lead finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain–like output; pulls to within 0.4V of V+ or GND without external pullup |
| 2 | INA− | Inverting input for comparator A; rail-to-rail capable, tolerant of short-circuit to either supply rail |
| 3 | INA+ | Noninverting input for comparator A; same rail-to-rail and fault-tolerant characteristics as INA− |
| 4 | V+ | Positive supply input; absolute max rating +6.5V; decoupling capacitor must be placed adjacent to this pin |
| 5 | INB+ | Noninverting input for comparator B; electrically identical to INA+, fully independent channel |
| 6 | INB− | Inverting input for comparator B; matches INA− performance and fault tolerance |
| 7 | OUTB | Comparator B output; identical drive capability and voltage swing to OUTA |
| 8 | GND | Analog ground reference; requires low-inductance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Accepts signals −0.2V to V+ + 0.2V - eliminates need for input level-shifting circuitry in mixed-voltage systems |
| Internal hysteresis | 1mV (typ) input-referred - prevents oscillation on slow edges without external resistor networks |
| CMOS/TTL-compatible outputs | VOH/VOL meet 3V/5V logic thresholds without pullup resistors - reduces BOM count and board space |
| Low quiescent current | 350μA per comparator at 3V - extends battery life in portable instrumentation and sensor nodes |
| High-speed, low-noise design | 80ns propagation delay with ≤10ns inter-channel skew - supports precise timing alignment in dual-signal monitoring |
Applications
| Threshold Detector | Line Receiver |
|---|---|
|
Use Scenario: Monitoring battery voltage against low-charge cutoff threshold in handheld medical devices. IC Role / Device Role / Timing Role: Dual comparator independently compares battery voltage to two reference levels (e.g., 3.3V and 3.0V) to trigger staged power management actions. Use Value: Rail-to-rail input enables direct sensing without attenuation; 80ns response ensures timely shutdown before deep discharge. |
Use Scenario: Converting noisy RS-485 differential signals to clean single-ended logic levels in industrial PLC I/O modules. IC Role / Device Role / Timing Role: One comparator channel acts as differential line receiver with hysteresis to reject common-mode noise on long cables. Use Value: Internal hysteresis and 1mV offset ensure stable decision points despite EMI-induced signal jitter on field wiring. |
| Zero-Crossing Detector | Sampling Circuit Trigger |
|
Use Scenario: Detecting AC mains zero-crossing for phase-controlled dimming in smart lighting controllers. IC Role / Device Role / Timing Role: Comparator compares rectified AC waveform to GND reference; output toggles precisely at voltage crossing. Use Value: −0.2V to V+ + 0.2V input range accommodates negative half-cycles without clamping diodes; 80ns delay minimizes phase error. |
Use Scenario: Generating precise sample-enable pulses for ADCs in data acquisition systems with variable analog input ranges. IC Role / Device Role / Timing Role: Second comparator monitors auxiliary control signal (e.g., FPGA flag) to gate sampling window timing. Use Value: Matched propagation delay between channels (<10ns skew) ensures synchronous enable timing across dual ADC channels. |
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 (1.3μs propagation delay), no rail-to-rail inputs, higher 1mA supply current per comparator | Suitable only for non-critical DC threshold detection; cannot interface directly to sub-1V references or operate below 2V | Select when cost is primary constraint and speed/power specs are relaxed |
| TLV3501CDR | Faster (4.5ns delay), rail-to-rail inputs, but 2.5mA supply current and limited −40°C to +85°C temp range | Better for high-frequency pulse discrimination, but unsuitable for extended-temperature automotive or industrial control | Select when nanosecond response is required and thermal budget permits higher power dissipation |
Compared with LM393DR and TLV3501CDR, MAX942AUA+T uniquely balances 80ns speed, 350μA ultra-low power, rail-to-rail input operation, and −40°C to +125°C qualification-making it optimal for thermally constrained, battery-sensitive, or wide-temperature embedded systems requiring precise dual-threshold decisions.
Availability
MAX942AUA+T is available at Aetrix Electronics and suitable for battery-powered systems, industrial sensor interfaces, and automotive body electronics requiring stable component supply across extended temperature ranges.
Supply support for MAX942AUA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX94x family was designed specifically for high-speed, low-power, single-supply comparator applications in portable and harsh-environment systems where rail-to-rail input range and guaranteed propagation delay are critical.
FAQ
What is the operating temperature range for MAX942AUA+T?
The MAX942AUA+T is rated for operation from −40°C to +125°C, making it suitable for under-hood automotive, industrial control, and outdoor equipment applications. This extended range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet, and is distinct from the −40°C to +85°C grade (MAX942EUA-T).
Does MAX942AUA+T require external pullup resistors on its outputs?
No, MAX942AUA+T does not require external pullup resistors. Its outputs actively drive to within 0.2V of V+ (VOH) and 0.2V of GND (VOL) at 400μA load, meeting standard CMOS and TTL logic thresholds directly. This is explicitly stated in the Electrical Characteristics table under "Output High/Low Voltage" and confirmed in the General Description.
What is the input common-mode voltage range of MAX942AUA+T?
The input common-mode voltage range of MAX942AUA+T is −0.2V to V+ + 0.2V, as specified in the Electrical Characteristics table. This rail-to-rail-plus margin allows the device to accept input signals slightly below ground or above the positive supply-critical for interfacing with sensors or transducers that swing beyond supply rails.
How does internal hysteresis improve noise immunity in MAX942AUA+T?
MAX942AUA+T includes fixed internal hysteresis (~1mV input-referred), which creates separate upper and lower trip points. This prevents output oscillation when input signals are near the threshold-especially beneficial for slow-moving or noisy signals like temperature sensor outputs or AC line monitoring. No external components are needed, unlike standard comparators.
Is MAX942AUA+T pin-compatible with other MAX942 variants?
Yes, all MAX942 variants-including MAX942AUA+T, MAX942EUA-T, and MAX942ESA-share identical 8-pin μMAX/SO/PDIP pinouts and electrical behavior. The suffix denotes only temperature grade and packaging; the core functionality, pin functions, and timing parameters remain consistent across grades.
MAX942AUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX942AUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942AUA+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 MAX942AUA+T reliable?
The price and inventory of MAX942AUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942AUA+T is usually 5 days.
3.What payment methods are accepted for MAX942AUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942AUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942AUA+T?
MAX942AUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942AUA+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 MAX942AUA+T?
For technical support, including MAX942AUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942AUA+T requirements.
6.How does Aetrix verify that MAX942AUA+T is sourced from the original manufacturer or authorized distributors?
All MAX942AUA+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 MAX942AUA+T meets industry standards.
7.What is the process for return or replacement of MAX942AUA+T?
All MAX942AUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX942AUA+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 MAX942AUA+T part is unused and in its original packaging.
Return procedure for MAX942AUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942AUA+T Tags
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