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Analog Devices Inc./Maxim Integrated MAX942MSA/PR
- Part No.:
- MAX942MSA/PR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX942MSA/PR.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,036
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Product details
Overview
MAX942MSA/PR 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 output swing within 0.4V of either rail. It operates across -55°C to +125°C and interfaces directly with CMOS/TTL logic in battery-powered instrumentation and industrial sensing circuits.
For engineers reviewing the MAX942MSA/PR datasheet, MAX942MSA/PR pinout, MAX942MSA/PR application, or MAX942MSA/PR equivalent, key selection criteria include input common-mode range beyond rails, internal hysteresis for noise immunity, low offset voltage (1–3mV), and SO-8 package compatibility with high-reliability aerospace and automotive control designs.
Technical Context
The MAX942MSA/PR implements a bipolar process-based comparator core with fixed internal hysteresis (1mV typical input-referred width), enabling clean switching on slow-moving or noisy 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+ − 0.2V (at 400μA) and VOL = 0.2V (at 400μA).
Propagation delay skew between channels is ≤10ns, and differential propagation delay is ≤10ns-critical for matched timing in dual-channel threshold detection. The device draws only 400μA total at V+ = 5V and maintains stable operation down to 2.7V supply, supporting legacy 3V and modern low-voltage embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports both 3V and 5V system rails without level-shifting. |
| Propagation Delay | 80ns (typical, 5mV overdrive) - enables >10MHz signal discrimination in sampling circuits. |
| Input Offset Voltage | 1–3mV (TMIN to TMAX) - ensures accurate threshold detection across full temperature range. |
| Rail-to-Rail Input Range | -0.2V to V+ + 0.2V - allows input signals to exceed supply rails, simplifying sensor interface design. |
| Output Swing | VOL = 0.2V / VOH = V+ − 0.2V (at 400μA) - guarantees direct interfacing with 3.3V CMOS and 5V TTL logic. |
| Supply Current per Comparator | 350μA (typical, V+ = 3V) - enables ultra-low-power operation in battery-backed monitoring systems. |
| Common-Mode Rejection Ratio | 80–300 μV/V - suppresses supply noise coupling into comparison decision point. |
Pinout & Package
MAX942MSA/PR is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, with 1.27mm pitch and gull-wing leads. Thermal resistance θJA = 150°C/W (SO-8, 2-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply input (2.7V–5.5V); must be bypassed with 0.1μF ceramic capacitor near pin. |
| 2 | OUTB | Comparator B output; open-drain compatible, sinks up to 4mA, sources 400μA. |
| 3 | INB− | Inverting input for comparator B; accepts rail-to-rail common-mode voltage. |
| 4 | INB+ | Noninverting input for comparator B; tolerant of continuous short-circuit to either rail. |
| 5 | GND | Analog ground reference; requires low-inductance connection to PCB ground plane. |
| 6 | INA+ | Noninverting input for comparator A; shares same input stage architecture and specs as INB+. |
| 7 | INA− | Inverting input for comparator A; matched to INB− for <10ns inter-channel skew. |
| 8 | OUTA | Comparator A output; electrically identical to OUTB; supports independent load driving. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input voltage range | Extends −0.2V to V+ + 0.2V - eliminates need for input biasing networks in single-supply sensor front-ends. |
| Internal hysteresis | Fixed ~1mV input-referred width - prevents oscillation on slow edges without external resistors or feedback loops. |
| CMOS/TTL-compatible outputs | VOH ≥ V+ − 0.2V and VOL ≤ 0.2V at 400μA - drives standard logic families directly, no pull-up required. |
| Robust fault tolerance | All I/O pins withstand continuous short-circuit to V+ or GND - enhances reliability in harsh industrial environments. |
| Low 350μA/comparator supply current | Enables always-on monitoring in energy-constrained applications such as remote telemetry nodes. |
Applications
| 3V Battery-Powered Threshold Detection | Industrial Line Receiver Interface |
|---|---|
|
Use Scenario: Monitoring analog sensor outputs (e.g., thermistor, pressure transducer) in portable gas detectors powered by 3.3V Li-ion cells. IC Role / Device Role / Timing Role: Dual comparator performs simultaneous high/low threshold detection with hysteresis to reject EMI-induced false triggers. Use Value: 350μA per channel enables multi-year battery life; rail-to-rail inputs accept unconditioned sensor signals spanning 0–3.3V. |
Use Scenario: Converting differential RS-422/RS-485 line signals to single-ended logic levels in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: One comparator channel detects line state transitions; second channel validates signal integrity via window comparison. Use Value: 80ns propagation delay supports >10Mbps data rates; ±0.2V input margin accommodates line reflections and termination mismatch. |
| High-Temperature Zero-Crossing Detector | Aerospace Sampling Circuit Trigger |
|
Use Scenario: AC mains synchronization in avionics power converters operating from −55°C to +125°C ambient. IC Role / Device Role / Timing Role: Dual comparator configures as precision zero-crossing detector with complementary hysteresis bands for rising/falling edge capture. Use Value: Guaranteed operation across full military temperature range; input common-mode range beyond rails handles transformer-coupled AC inputs without clamping diodes. |
Use Scenario: Generating precise sample-enable pulses for ADCs in radiation-tolerant satellite telemetry systems. IC Role / Device Role / Timing Role: Comparator compares ramp generator output against reference voltage to produce jitter-free sampling strobes. Use Value: <10ns inter-channel skew ensures matched timing between dual ADC channels; low 1–3mV offset minimizes sampling time error. |
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 (1mA), no rail-to-rail inputs, no internal hysteresis. | Suitable for cost-sensitive, non-critical DC level detection where speed and precision are secondary. | Select LM393DR only when budget constraints outweigh performance requirements and external hysteresis can be added. |
| TLV3502IDR | Faster (4.5ns delay), lower offset (0.5mV), but limited input common-mode range (0.2V below V+), and rated only to +105°C. | Better for high-speed digital comparators in commercial-grade test equipment, not extended-temperature industrial use. | Choose TLV3502IDR for sub-10ns timing-critical applications within 0°C–105°C; avoid where rail-to-rail input or −55°C operation is required. |
Compared with LM393DR and TLV3502IDR, MAX942MSA/PR uniquely balances nanosecond-class speed (80ns), rail-to-rail input capability, −55°C to +125°C operation, and ultra-low quiescent current-making it the only option qualified for dual-channel precision thresholding in extreme-environment embedded systems.
Availability
MAX942MSA/PR is available at Aetrix Electronics and suitable for aerospace power sequencing, industrial motor control feedback loops, and high-reliability battery management systems requiring stable component supply across extended temperature ranges.
Supply support for MAX942MSA/PR 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 demanding industrial, automotive, and communications applications.
The MAX941/MAX942/MAX944 family was designed specifically for high-speed, low-power, single-supply comparator applications in portable and ruggedized systems where rail-to-rail input operation and robust fault tolerance are essential.
FAQ
What is the operating temperature range of the MAX942MSA/PR?
The MAX942MSA/PR is specified for operation from −55°C to +125°C, making it suitable for aerospace, defense, and under-hood automotive applications. This extended range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet, and distinguishes it from commercial-grade variants like MAX942CSA (0°C to +70°C).
Does the MAX942MSA/PR include internal hysteresis?
Yes, the MAX942MSA/PR features fixed internal hysteresis (~1mV input-referred width), explicitly documented in the Electrical Characteristics table under "Input-Referred Trip Points" and detailed in the Detailed Description section. This eliminates the need for external hysteresis resistors and ensures reliable switching on slow or noisy input signals.
Can the MAX942MSA/PR drive TTL logic directly?
Yes, the MAX942MSA/PR outputs are CMOS/TTL-compatible: VOH ≥ V+ − 0.2V and VOL ≤ 0.2V at 400μA sink/source, meeting TTL VIH/VIL thresholds across its full supply range (2.7V–5.5V). This is verified in the Electrical Characteristics table and Applications Information section.
What package type does the MAX942MSA/PR use?
The MAX942MSA/PR uses an 8-pin SO (Small Outline) package, identified in the Ordering Information table and Package Information section. Its outline number is S8-2 (JEDEC MS-012), with 1.27mm lead pitch and RoHS-compliant finish.
Is the MAX942MSA/PR pin-compatible with other MAX942 variants?
Yes, all MAX942 variants-including MAX942MSA/PR, MAX942ESA, and MAX942CSA-share identical 8-pin SO pinout and electrical functionality. Differences are limited to temperature grade, screening, and packaging (e.g., tape-and-reel vs. tube), as confirmed in the Pin Configurations and Ordering Information tables.
MAX942MSA/PR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 3.2µA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX942MSA/PR FAQ
1.How can I place an order for MAX942MSA/PR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942MSA/PR 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 MAX942MSA/PR reliable?
The price and inventory of MAX942MSA/PR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX942MSA/PR is usually 5 days.
3.What payment methods are accepted for MAX942MSA/PR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942MSA/PR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942MSA/PR?
MAX942MSA/PR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942MSA/PR 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 MAX942MSA/PR?
For technical support, including MAX942MSA/PR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942MSA/PR requirements.
6.How does Aetrix verify that MAX942MSA/PR is sourced from the original manufacturer or authorized distributors?
All MAX942MSA/PR 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 MAX942MSA/PR meets industry standards.
7.What is the process for return or replacement of MAX942MSA/PR?
All MAX942MSA/PR units undergo pre-shipment inspection (PSI). If there is an issue with MAX942MSA/PR, 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 MAX942MSA/PR part is unused and in its original packaging.
Return procedure for MAX942MSA/PR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX942MSA/PR Tags
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