My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX942CUA+T
- Part No.:
- MAX942CUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX942CUA+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX942CUA+T 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+T datasheet, MAX942CUA+T pinout, MAX942CUA+T application, or MAX942CUA+T equivalent, key selection criteria include input common-mode range 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+T implements a bipolar-input comparator architecture 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).
Designed for single-supply operation, it supports 3V/5V logic interfacing directly-no pull-up resistors required-and tolerates continuous short-circuit faults on all pins to either rail. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns, ensuring matched timing across both comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - enables direct use in Li-ion battery (3.0–4.2V) and 3.3V/5V logic systems without level shifting |
| Propagation Delay | 80ns (typ, 5mV overdrive) - supports >10MHz signal discrimination in sampling and zero-crossing applications |
| Input Offset Voltage | 1mV (typ, TA = +25°C) - ensures accurate threshold detection down to millivolt-level differentials |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows sensing below GND or above V+ (e.g., sensor biasing, AC-coupled inputs) |
| Output Swing | VOL = 0.2V / VOH = V+ – 0.2V (at 400μA) - guarantees full logic-high/low compatibility with 3.3V CMOS and 5V TTL loads |
| Supply Current per Comparator | 350μA (typ, V+ = 3V) - enables ultra-low-power operation in always-on monitoring circuits |
| Input Common-Mode Rejection | 80μV/V (min) - maintains stable trip points despite supply ripple or ground bounce |
Pinout & Package
MAX942CUA+T is housed in an 8-pin μMAX® package (U8-1 outline), measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and RoHS-compliant matte tin lead finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain compatible push-pull output - drives CMOS/TTL loads directly; sinks up to 4mA, sources up to 400μA |
| 2 | INA− | Inverting input of Comparator A - accepts rail-to-rail common-mode voltage; protected by internal 4.1kΩ series resistors and back-to-back diodes |
| 3 | INA+ | Noninverting input of Comparator A - identical electrical characteristics to INA−; supports differential or single-ended configurations |
| 4 | V+ | Positive supply pin - must be ≤6.5V; requires local 0.1μF ceramic decoupling placed adjacent to pin |
| 5 | INB+ | Noninverting input of Comparator B - electrically isolated from Channel A; matched offset and delay specs ensure channel-to-channel consistency |
| 6 | INB− | Inverting input of Comparator B - shares same protection and common-mode range as INA−/INA+ |
| 7 | OUTB | Comparator B push-pull output - independent of OUTA; supports simultaneous dual-threshold decision logic |
| 8 | GND | Analog/digital ground reference - must connect to low-impedance ground plane; shared return for both comparators and supply |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Accepts inputs from –0.2V to V+ + 0.2V - eliminates need for external level-shifting circuitry in mixed-voltage sensor interfaces |
| Internal hysteresis | 1mV typical input-referred hysteresis width - prevents chatter on slow edges or noisy thresholds without external resistor networks |
| Low quiescent current | 350μA per comparator at 3V - extends battery life in portable medical monitors and IoT endpoint sensors |
| CMOS/TTL-compatible outputs | VOH ≥ V+ – 0.2V, VOL ≤ 0.2V at 400μA - directly drives microcontroller GPIOs, FPGA I/O banks, and logic gates without interface buffers |
| Short-circuit fault tolerance | All pins withstand continuous short to V+ or GND - improves system robustness in industrial fieldbus receivers and motor control feedback paths |
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 2.8V. IC Role / Device Role / Timing Role: Dual comparator performs independent high- and low-threshold detection with no external hysteresis components. Use Value: 80ns response ensures fast reaction to overvoltage events; 350μA/quiescent current minimizes standby drain on battery. |
Use Scenario: Converting RS-422 differential signals to single-ended 3.3V logic levels for FPGA input capture. IC Role / Device Role / Timing Role: One comparator acts as differential receiver (IN+–IN−), the other provides reference bias stability. Use Value: Rail-to-rail inputs accept ±10V common-mode range; matched propagation delay (<10ns skew) preserves data eye integrity. |
| Zero-Crossing Detector for AC Mains | Sampling Circuit Trigger Generator |
|
Use Scenario: Detecting AC line zero crossings in smart energy meters using resistively scaled 230VAC waveform. IC Role / Device Role / Timing Role: Comparator compares scaled AC input against GND reference; internal hysteresis rejects EMI-induced false triggers. Use Value: Input common-mode range extending below GND (–0.2V) accommodates negative half-cycle without clamping diodes. |
Use Scenario: Generating precise sample-enable pulses synchronized to analog signal peaks in data acquisition front-ends. IC Role / Device Role / Timing Role: Dual comparator configures window detector: one sets upper bound, the other lower bound for peak-hold timing. Use Value: 80ns propagation delay enables sub-12.5MHz sampling rate support; low offset (1mV typ) ensures <0.03% amplitude error at 3V full scale. |
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), higher supply current (500μA/channel), no rail-to-rail inputs (CMVR = 0V to V+ – 1.5V) | Suitable only for DC or low-frequency thresholding; cannot replace MAX942CUA+T in high-speed or wide common-mode applications | Select when cost sensitivity outweighs speed and input range requirements; verify VCMR compatibility with sensor output swing |
| TLV3502IDR | Faster (4.5ns delay), rail-to-rail inputs/outputs, but higher supply current (1.2mA/channel) and no internal hysteresis | Requires external hysteresis resistors for noise immunity; better for nanosecond timing, worse for low-power battery use | Prefer for ultra-high-speed pulse discrimination where power budget allows; avoid in always-on sensor nodes due to 3.4× higher ICC |
Compared with LM393DR and TLV3502IDR, the MAX942CUA+T uniquely balances 80ns speed, 350μA/channel efficiency, rail-to-rail input operation, and built-in hysteresis-making it optimal for portable, noise-prone, medium-speed threshold detection where layout area and BOM count are constrained.
Availability
MAX942CUA+T is available at Aetrix Electronics and suitable for battery-powered systems, 3.3V line receivers, and zero-crossing detectors requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for MAX942CUA+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 precision analog, mixed-signal, and high-speed interface ICs for industrial, communications, and consumer applications.
The MAX942CUA+T belongs to the MAX94x family of high-speed, low-power, single-supply comparators designed specifically for 3V/5V portable and embedded systems requiring rail-to-rail input operation and minimal external components.
FAQ
What is the operating temperature range for the MAX942CUA+T?
The MAX942CUA+T is rated for –40°C to +85°C operation, as indicated by the "E" grade suffix and "U" μMAX package designation. This industrial temperature range supports deployment in automotive cabin modules, industrial PLC I/O cards, and outdoor IoT gateways without derating. The device maintains specified propagation delay (≤200ns max), offset voltage (≤6mV max), and supply current (≤500μA/channel) across this full range.
Does the MAX942CUA+T require external pull-up resistors on its outputs?
No, the MAX942CUA+T does not require external pull-up resistors. Its outputs are push-pull (not open-drain) and actively drive high to V+ – 0.2V and low to 0.2V at 400μA load. This design enables direct interfacing with CMOS and TTL logic families without additional components-reducing BOM count, board area, and potential signal integrity issues from resistor parasitics.
Can the MAX942CUA+T operate from a 2.7V supply?
Yes, the MAX942CUA+T is fully specified to operate from 2.7V to 5.5V. At 2.7V, it delivers 80ns typical propagation delay, 350μA typical supply current per comparator, and maintains rail-to-rail input operation (–0.2V to 2.9V). This makes it ideal for single-cell Li-ion (2.7–4.2V) and low-voltage microcontroller systems where supply headroom is limited.
How does the internal hysteresis of the MAX942CUA+T improve noise immunity?
The MAX942CUA+T incorporates fixed internal hysteresis (~1mV input-referred width), creating distinct upper and lower trip points. This prevents output oscillation when input signals linger near the threshold-common with slow-moving sensor outputs or EMI-coupled traces. Unlike external hysteresis networks, it requires no design calculations or PCB real estate, delivering consistent noise rejection across temperature and supply voltage without user tuning.
Is the MAX942CUA+T pin-compatible with other MAX94x variants in μMAX-8?
Yes, the MAX942CUA+T shares identical pinout and footprint with all MAX94x μMAX-8 devices-including MAX941EUA-T (single), MAX942EUA-T (dual), and MAX942AUA-T (–40°C to +125°C). Pin functions (OUTA, INA−, INA+, V+, INB+, INB−, OUTB, GND) are consistent across the family, enabling drop-in replacement for functional upgrades or temperature grade changes without PCB revision.
MAX942CUA+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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX942CUA+T FAQ
1.How can I place an order for MAX942CUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942CUA+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 MAX942CUA+T reliable?
The price and inventory of MAX942CUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942CUA+T is usually 5 days.
3.What payment methods are accepted for MAX942CUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942CUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942CUA+T?
MAX942CUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942CUA+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 MAX942CUA+T?
For technical support, including MAX942CUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942CUA+T requirements.
6.How does Aetrix verify that MAX942CUA+T is sourced from the original manufacturer or authorized distributors?
All MAX942CUA+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 MAX942CUA+T meets industry standards.
7.What is the process for return or replacement of MAX942CUA+T?
All MAX942CUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX942CUA+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 MAX942CUA+T part is unused and in its original packaging.
Return procedure for MAX942CUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942CUA+T Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP USA Inc.
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
