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Analog Devices Inc./Maxim Integrated MAX942ESA+T
- Part No.:
- MAX942ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX942ESA+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,884
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Product details
Overview
The MAX942ESA+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, line receivers, and zero-crossing circuits.
For engineers reviewing the MAX942ESA+T datasheet, MAX942ESA+T pinout, MAX942ESA+T application, or MAX942ESA+T equivalent, key selection considerations include input common-mode range beyond rails (–0.2V to V+ + 0.2V), 1mV typical offset voltage, internal hysteresis for noise immunity, output swing within 0.4V of rails, and SO-8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The MAX942ESA+T implements a bipolar process-based comparator core with internal hysteresis (input-referred width ~2mV), enabling clean switching on slow-moving signals without external 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+ – 0.4V and VOL ≤ 0.4V at 400μA load.
Designed for low-power, high-speed operation, it achieves 80ns propagation delay with 5mV overdrive and maintains <10ns propagation skew between channels. Input bias current is 150–400nA over temperature, and PSRR/CMRR exceed 80dB across the full common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 5.5V - supports both 3V and 5V systems with margin for brownout tolerance |
| Propagation Delay | 80ns (typ) at 5mV overdrive - enables timing-critical sampling and fast edge detection |
| Input Offset Voltage | 1mV (typ) at +25°C - ensures accurate threshold discrimination in precision sensing |
| Supply Current | 350μA per comparator (typ at 3V) - enables multi-channel operation in power-constrained designs |
| Input Common-Mode Range | –0.2V to V+ + 0.2V - allows interface with signals exceeding supply rails, e.g., sensor offsets |
| Output Voltage Swing | VOH ≥ V+ – 0.4V, VOL ≤ 0.4V at 400μA - directly drives CMOS/TTL logic without pull-ups |
| Hysteresis | Internal, fixed - eliminates need for external feedback resistors and simplifies PCB layout |
Pinout & Package
MAX942ESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 1.27mm pitch and surface-mount footprint (land pattern 90-0096). The package supports reflow soldering and provides thermal performance suitable for industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain compatible push-pull output - sinks or sources current without external pull-up |
| 2 | INA− | Inverting input of Comparator A - accepts rail-to-rail common-mode voltage including below GND |
| 3 | INA+ | Noninverting input of Comparator A - matched to INA− for precise differential thresholding |
| 4 | V+ | Positive supply pin - must be ≤6.5V; decoupling capacitor required adjacent to pin |
| 5 | INB+ | Noninverting input of Comparator B - independent channel with identical specs to Comparator A |
| 6 | INB− | Inverting input of Comparator B - fully differential pair with INB+ for dual-threshold applications |
| 7 | OUTB | Comparator B push-pull output - electrically isolated from OUTA; supports independent logic interfacing |
| 8 | GND | Analog/digital ground reference - requires low-inductance connection to solid ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Operates with inputs from –0.2V to V+ + 0.2V - accommodates sensor offsets and AC-coupled signals |
| Internal hysteresis | Fixed ~2mV input-referred hysteresis - prevents oscillation on slow or noisy inputs without external components |
| Low quiescent current | 350μA per comparator at 3V - enables dual-channel monitoring in always-on battery systems |
| CMOS/TTL-compatible outputs | Push-pull outputs swing within 0.4V of rails - directly interfaces to 3.3V/5V logic families without level shifters |
| Robust input protection | Withstands continuous short-circuit to either rail - enhances reliability in harsh or miswired environments |
Applications
| Threshold Detector | Line Receiver |
|---|---|
Use Scenario: Monitoring battery voltage against low-charge cutoff or overvoltage thresholds in portable devices. IC Role / Device Role / Timing Role: Dual comparator performs simultaneous high/low threshold comparison using shared reference and independent inputs. Use Value: 1mV offset and rail-to-rail inputs ensure accurate trip points across 2.7–5.5V supply range, minimizing false triggers during voltage sag. | Use Scenario: Converting differential or single-ended analog line signals (e.g., RS-422, coax) into clean digital logic levels. IC Role / Device Role / Timing Role: High-speed comparator acts as a noise-immune signal restorer with 80ns response to fast transitions. Use Value: Internal hysteresis rejects EMI-induced jitter on long traces, while 350μA per channel enables multi-line reception in compact modules. |
| Zero-Crossing Detector | Sampling Circuit Trigger |
Use Scenario: Detecting AC waveform zero crossings for phase-controlled dimming, motor commutation, or power metering. IC Role / Device Role / Timing Role: Comparator compares sinusoidal input to ground reference, generating precise logic edges synchronized to zero crossing. Use Value: Rail-to-rail input allows direct connection to AC-coupled signals; 80ns delay ensures sub-microsecond timing accuracy at 50/60Hz and harmonics. | Use Scenario: Generating precise sample-enable pulses for ADCs in data acquisition systems with variable input slew rates. IC Role / Device Role / Timing Role: Comparator triggers sampling clock based on input signal crossing a programmable threshold. Use Value: Low 1mV offset and 80ns propagation delay minimize aperture uncertainty, supporting >100ksps effective sampling rates. |
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), no rail-to-rail inputs, no internal hysteresis | Suitable only for non-critical, low-speed threshold detection where power and speed are not constrained | Select LM393DR only when cost is primary and 80ns timing or rail-to-rail operation is unnecessary |
| TLV3502IDR | Faster (4.5ns), lower supply current (15μA), rail-to-rail inputs/outputs, but requires external hysteresis and has narrower common-mode range (to V+ – 0.1V) | Better for ultra-high-speed, ultra-low-power apps but increases design complexity for noise immunity | Choose TLV3502IDR when nanosecond response is mandatory and board space allows hysteresis resistor placement |
Compared with LM393DR and TLV3502IDR, the MAX942ESA+T uniquely balances 80ns speed, 350μA efficiency, rail-to-rail input operation, and built-in hysteresis - making it optimal for industrial and portable systems requiring robust, self-contained dual-comparator functionality without layout overhead.
Availability
MAX942ESA+T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors/discriminators, and line receivers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX942ESA+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, communications, and consumer applications.
The MAX94x family was designed specifically for low-voltage, high-speed comparator applications in portable and 3V/5V systems - emphasizing rail-to-rail operation, low power, and integrated noise immunity without external components.
FAQ
What is the operating temperature range for the MAX942ESA+T?
The MAX942ESA+T is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The 'E' grade suffix explicitly denotes this extended temperature capability, ensuring reliable performance in demanding environments such as factory automation and outdoor electronics where the MAX942ESA+T is commonly deployed.
Does the MAX942ESA+T have internal hysteresis, and how does it affect design?
Yes, the MAX942ESA+T includes fixed internal hysteresis (~2mV input-referred), eliminating the need for external positive-feedback resistors. This simplifies PCB layout and improves consistency across units and temperatures. In practice, the hysteresis prevents output chatter on slow-moving or noisy inputs - a critical advantage in threshold detection and zero-crossing applications where the MAX942ESA+T is frequently used without additional components.
Can the MAX942ESA+T drive TTL and CMOS logic directly?
Yes, the MAX942ESA+T features push-pull outputs that swing to within 0.4V of V+ and GND at 400μA load, meeting standard TTL (2.4V VOH min, 0.4V VOL max) and CMOS (VDD – 0.2V VOH min, 0.2V VOL max for 3.3V) logic thresholds. No external pull-up resistors are needed, reducing bill-of-materials count and enabling direct interface with microcontrollers, FPGAs, and logic gates - a key design benefit of the MAX942ESA+T in mixed-signal systems.
What is the maximum supply voltage the MAX942ESA+T can tolerate?
The MAX942ESA+T has an absolute maximum supply voltage (V+ to GND) of +6.5V, as specified in the Absolute Maximum Ratings table. However, functional operation is guaranteed only from 2.7V to 5.5V per the Electrical Characteristics. Operating above 5.5V risks parametric degradation or damage, so system designs must limit V+ to ≤5.5V during normal use - a constraint clearly defined for the MAX942ESA+T in all recommended operating conditions.
Is the MAX942ESA+T pin-compatible with other packages in the MAX942 family?
Yes, the MAX942ESA+T (SO-8) shares identical pinout and function with the MAX942EPA (PDIP-8) and MAX942EUA-T (μMAX-8), as shown in the Pin Configurations diagram. All three variants use the same 1–8 pin numbering and terminal assignments (e.g., Pin 1 = OUTA, Pin 4 = V+, Pin 8 = GND). This allows drop-in replacement across packages - a verified mechanical and electrical compatibility confirmed in the MAX942 datasheet for the MAX942ESA+T and its siblings.
MAX942ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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
- :
- 2mV @ 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 ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX942ESA+T FAQ
1.How can I place an order for MAX942ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942ESA+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 MAX942ESA+T reliable?
The price and inventory of MAX942ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942ESA+T is usually 5 days.
3.What payment methods are accepted for MAX942ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942ESA+T?
MAX942ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942ESA+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 MAX942ESA+T?
For technical support, including MAX942ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942ESA+T requirements.
6.How does Aetrix verify that MAX942ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX942ESA+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 MAX942ESA+T meets industry standards.
7.What is the process for return or replacement of MAX942ESA+T?
All MAX942ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX942ESA+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 MAX942ESA+T part is unused and in its original packaging.
Return procedure for MAX942ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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