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Analog Devices Inc./Maxim Integrated MAX942CPA+
- Part No.:
- MAX942CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX942CPA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX942CPA+ 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 threshold detection, zero-crossing sensing, and battery-powered line receivers.
For engineers reviewing the MAX942CPA+ datasheet, MAX942CPA+ pinout, MAX942CPA+ application, or MAX942CPA+ 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 compatibility with 8-pin PDIP packaging for through-hole prototyping and industrial control interfaces.
Technical Context
The MAX942CPA+ 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 and 5V logic domains simultaneously, with CMRR and PSRR both ≥80 μV/V over full temperature range. Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns - critical for matched timing in dual-channel sampling circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - enables direct interface with Li-ion battery (3.0–4.2V) and 3.3V/5V logic without level shifters. |
| Propagation Delay | 80ns (typical, 5mV overdrive) - supports >10MHz signal discrimination in real-time monitoring applications. |
| Input Offset Voltage | 1mV (typ, TA = +25°C); 3mV (max, full temp range) - ensures accurate threshold detection down to millivolt-level differentials. |
| Rail-to-Rail Input Range | –0.2V to V+ + 0.2V - allows input signals exceeding supply rails, simplifying sensor interfacing (e.g., thermocouples, bridge amplifiers). |
| Output Swing | VOL = 0.2V / VOH = V+ – 0.2V (at 400μA) - guarantees reliable logic-high/low assertion into CMOS and TTL loads without pull-ups. |
| Supply Current | 350μA per comparator (typ, V+ = 3V) - enables dual-comparator operation at <700μA total, suitable for always-on battery sensors. |
| Input Bias Current | 150–300nA (MAX942_C_ series) - minimizes voltage error in high-impedance source networks (e.g., photodiode preamps). |
Pinout & Package
MAX942CPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard breadboards and PCB layouts for industrial control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Comparator A open-drain-like output; pulls to within 0.4V of V+ or GND - directly drives logic inputs without external resistors. |
| 2 | INA− | Inverting input of Comparator A; supports common-mode range beyond rails - accepts negative transients or overvoltage signals safely. |
| 3 | INA+ | Noninverting input of Comparator A; matched offset and bias with INA− - enables precision differential threshold setting. |
| 4 | V+ | Positive supply pin; absolute max 6.5V - decoupling capacitor must be placed adjacent to this pin for stable high-speed operation. |
| 5 | INB+ | Noninverting input of Comparator B; electrically isolated from INA+ - permits independent dual-threshold configuration (e.g., window detector). |
| 6 | INB− | Inverting input of Comparator B; identical specs to INA− - supports matched channel performance for time-critical dual-edge detection. |
| 7 | OUTB | Comparator B output; same drive strength and voltage swing as OUTA - enables synchronous dual-output logic generation. |
| 8 | GND | Analog ground reference; must connect to low-impedance ground plane - critical for minimizing propagation delay variation and noise coupling. |
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 when interfacing with ±10V sensors or op-amp outputs. |
| Internal hysteresis | 1mV typical input-referred hysteresis - prevents chatter on slow edges or noisy thresholds without requiring external resistor networks. |
| CMOS/TTL-compatible outputs | VOH ≥ V+ – 0.2V and VOL ≤ 0.4V at 4mA load - ensures direct connection to 3.3V or 5V microcontroller GPIOs and FPGA I/O banks. |
| Low quiescent current | 350μA per comparator at 3V - enables dual-comparator use in energy-constrained applications such as portable medical monitors or IoT wake-up circuits. |
| Robust fault tolerance | All I/O pins withstand continuous short-circuit to V+ or GND - protects against wiring errors or ESD-induced latch-up in field-deployed equipment. |
Applications
| Threshold Detector | Zero-Crossing Detector |
|---|---|
|
Use Scenario: Monitoring analog sensor output (e.g., temperature, pressure) against programmable trip points in HVAC controllers. IC Role / Device Role / Timing Role: Dual comparator configured as upper/lower threshold detector; one channel triggers on rising edge, the other on falling edge. Use Value: 80ns response time ensures sub-12.5kHz event capture; rail-to-rail inputs accept sensor outputs spanning 0–5V without attenuation or clamping. |
Use Scenario: Detecting AC line zero crossings for phase-controlled dimmers or motor commutation timing in smart appliances. IC Role / Device Role / Timing Role: Comparator compares AC waveform (centered at V+/2 via resistor divider) to reference; output toggles at polarity reversal. Use Value: Internal hysteresis rejects noise near zero crossing; 1mV offset ensures <0.02° phase error at 50Hz - critical for precise power factor correction. |
| Battery-Powered Line Receiver | Sampling Circuit Trigger |
|
Use Scenario: Receiving RS-232 or proprietary differential signals in handheld test equipment powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Converts attenuated or distorted line signals into clean digital logic levels for MCU UART input. Use Value: 350μA per comparator enables dual-channel reception with <700μA total supply draw; rail-to-rail inputs tolerate ±5V input swings via simple resistive scaling. |
Use Scenario: Generating precise sample-enable pulses synchronized to analog signal transitions in data acquisition front-ends. IC Role / Device Role / Timing Role: One comparator detects signal crossing threshold; second provides delayed or inverted strobe for pipeline timing alignment. Use Value: 10ns max propagation skew between channels ensures <1% timing jitter at 10MHz sampling rates - maintains ADC effective resolution. |
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 (common-mode limited to V+ – 1.5V). | Acceptable for DC threshold detection but unsuitable for AC zero-crossing or fast pulse discrimination above 100kHz. | Select LM393DR only for cost-sensitive, low-speed (<10kHz), non-rail-to-rail applications where layout space is constrained and speed is not critical. |
| TLV3502CDR | Faster (4.5ns delay), lower offset (1.5mV typ), rail-to-rail inputs/outputs, but requires minimum 2.7V supply and has higher quiescent current (1.2mA/channel). | Better for ultra-high-speed sampling (>100MHz) but less suitable for battery life-critical designs due to 3.4× higher power draw than MAX942CPA+. | Choose TLV3502CDR when nanosecond timing precision is mandatory and power budget allows >1mA per channel; avoid in multi-year battery deployments. |
Compared with LM393DR and TLV3502CDR, the MAX942CPA+ uniquely balances 80ns speed, 350μA/channel efficiency, rail-to-rail input flexibility, and robust fault tolerance - making it optimal for mid-speed industrial sensing where reliability, power, and interface simplicity are jointly prioritized.
Availability
MAX942CPA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial threshold monitoring, and AC line interface circuits requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for MAX942CPA+ 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 MAX942CPA+ belongs to the MAX94x family of high-speed, low-power comparators designed specifically for 3V/5V single-supply systems where rail-to-rail input capability, fast response, and low quiescent current are essential.
FAQ
What is the operating temperature range for the MAX942CPA+?
The MAX942CPA+ is specified for operation from 0°C to +70°C. This commercial-grade temperature range makes it suitable for indoor industrial controls, test equipment, and consumer electronics where ambient conditions remain within standard room-temperature environments. The device's electrical characteristics - including propagation delay, offset voltage, and supply current - are guaranteed across this full range per the datasheet.
Does the MAX942CPA+ require external pull-up resistors on its outputs?
No, the MAX942CPA+ does not require external pull-up resistors. Its outputs actively drive to within 0.2V of GND and V+ – 0.2V (at 400μA load), providing full CMOS/TTL logic compatibility without external components. This feature reduces bill-of-materials count and PCB area, especially valuable in space-constrained designs using the 8-pin PDIP package of the MAX942CPA+.
Can the MAX942CPA+ interface directly with a 3.3V microcontroller GPIO?
Yes, the MAX942CPA+ can interface directly with a 3.3V microcontroller GPIO. When powered from a 3.3V supply, its VOH exceeds 3.1V and VOL stays below 0.4V under 400μA load - well within 3.3V CMOS input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V). This eliminates level-shifting circuitry and simplifies integration in mixed-voltage systems using the MAX942CPA+.
What is the maximum supply voltage rating for the MAX942CPA+?
The MAX942CPA+ has an absolute maximum supply voltage rating of +6.5V between V+ and GND. However, its functional operating range is specified from 2.7V to 5.5V. Operating above 5.5V may cause parametric degradation or reliability risk, even if below the 6.5V absolute limit. For robust long-term performance in applications like 5V industrial buses, the MAX942CPA+ should be used within its 2.7V–5.5V recommended range.
How does internal hysteresis improve performance in the MAX942CPA+?
The MAX942CPA+ incorporates fixed internal hysteresis (~1mV input-referred) that creates distinct upper and lower trip points, preventing output oscillation during slow or noisy input transitions. This eliminates the need for external hysteresis resistors and associated design calculations. In practice, this ensures clean, chatter-free switching in applications like zero-crossing detection or threshold monitoring - a key advantage over basic comparators such as the LM393 when using the MAX942CPA+ in real-world signal chains.
MAX942CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 8-PDIP
MAX942CPA+ FAQ
1.How can I place an order for MAX942CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942CPA+ 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 MAX942CPA+ reliable?
The price and inventory of MAX942CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942CPA+ is usually 5 days.
3.What payment methods are accepted for MAX942CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942CPA+?
MAX942CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942CPA+ 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 MAX942CPA+?
For technical support, including MAX942CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942CPA+ requirements.
6.How does Aetrix verify that MAX942CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX942CPA+ 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 MAX942CPA+ meets industry standards.
7.What is the process for return or replacement of MAX942CPA+?
All MAX942CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX942CPA+, 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 MAX942CPA+ part is unused and in its original packaging.
Return procedure for MAX942CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942CPA+ Tags
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