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Analog Devices Inc./Maxim Integrated MAX942MSA/PR-T
- Part No.:
- MAX942MSA/PR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX942MSA/PR-T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
MAX942MSA/PR-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 output swing within 0.4V of both rails-enabling direct interface with CMOS/TTL logic in battery-powered threshold detection circuits.
For engineers reviewing the MAX942MSA/PR-T datasheet, MAX942MSA/PR-T pinout, MAX942MSA/PR-T application, or MAX942MSA/PR-T equivalent, key selection criteria include guaranteed operation from -55°C to +125°C, internal hysteresis for noise immunity, differential propagation delay ≤10ns, and SO-8 package compatibility with standard 8-pin surface-mount layouts.
Technical Context
The MAX942MSA/PR-T implements a bipolar input stage with back-to-back diode clamping and 4.1kΩ series resistors, enabling input common-mode range extension beyond both supply rails (–0.3V to V+ + 0.3V) and robust fault tolerance under continuous short-circuit conditions. Its current-driven output stage delivers fast slew rates while reducing static current after transition.
Internal hysteresis eliminates external resistor networks and ensures clean switching with slow-moving inputs; the dual-channel architecture guarantees matched propagation delay skew ≤10ns and differential delay ≤10ns between channels-critical for precision timing alignment in sampling and zero-crossing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports wide-input 3V/5V systems including Li-ion battery-powered designs |
| Propagation Delay | 80ns (typ) at 5mV overdrive - enables sub-12.5MHz sampling rate in high-speed discriminators |
| Input Offset Voltage | 1mV (typ) at +25°C, 3mV (max) over –55°C to +125°C - ensures stable trip-point accuracy across military temperature range |
| Supply Current per Comparator | 350μA (typ) at 3V - achieves ultra-low power in always-on monitoring circuits |
| Input Common-Mode Range | –0.3V to V+ + 0.3V - allows direct sensing of signals below ground or above V+, e.g., in line receivers |
| Output Voltage Swing | VOL = 0.4V (max) at 4mA sink; VOH = V+ – 0.4V (min) at 4mA source - guarantees TTL/CMOS logic-level compatibility without pull-ups |
| Power-Supply Rejection Ratio | 80μV/V (min) - maintains stable trip points despite supply ripple in noisy industrial environments |
Pinout & Package
MAX942MSA/PR-T is housed in an 8-pin SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant footprint, and RoHS-compliant matte tin lead finish.
| 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 open-drain output; sinks up to 4mA, pulls within 0.4V of GND |
| 3 | INB− | Inverting input for comparator B; accepts rail-to-rail common-mode voltage (–0.3V to V+ + 0.3V) |
| 4 | INB+ | Noninverting input for comparator B; same rail-to-rail range and fault-tolerant clamping as INB− |
| 5 | GND | Analog/digital ground reference; requires low-inductance plane connection for high-speed stability |
| 6 | INA+ | Noninverting input for comparator A; electrically identical to INB+ with matched offset and bias characteristics |
| 7 | INA− | Inverting input for comparator A; matched to INB− for precise differential signal handling |
| 8 | OUTA | Comparator A open-drain output; fully matched to OUTB for dual-channel timing-critical applications |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input stage | Enables direct sensing of signals at or beyond supply rails-no level-shifting required in 3V sensor interfaces |
| Internal hysteresis | Eliminates external feedback resistors and prevents oscillation on slow or noisy inputs (e.g., thermistor outputs) |
| Matched dual-channel timing | Differential propagation delay ≤10ns ensures synchronized decision-making in dual-signal monitoring (e.g., phase comparison) |
| –55°C to +125°C operating range | Qualified for extended-temperature industrial, aerospace, and downhole instrumentation without derating |
| CMOS/TTL-compatible outputs | Drives standard logic loads directly-no external pull-up needed for 3.3V or 5V microcontroller interfacing |
| Fault-tolerant inputs | Withstands continuous short-circuit to either rail-reduces need for external protection in harsh ESD-prone environments |
Applications
| 3V Battery-Powered Threshold Detector | Industrial Line Receiver |
|---|---|
Use Scenario: Detecting low-voltage battery depletion in portable medical devices using a precision resistive divider. IC Role / Device Role / Timing Role: Dual comparator monitors two independent thresholds (e.g., warning and shutdown) with simultaneous decision outputs. Use Value: 350μA per comparator enables multi-week runtime on coin-cell batteries; rail-to-rail inputs eliminate level-shifters for direct battery sensing. |
Use Scenario: Converting noisy analog RS-422/RS-485 differential line signals into clean digital logic levels in factory automation PLCs. IC Role / Device Role / Timing Role: One comparator channel acts as differential receiver; second provides fail-safe status flag on loss-of-signal. Use Value: 80ns delay supports >10Mbps data rates; ±0.3V input overvoltage tolerance handles cable-induced transients without damage. |
| Zero-Crossing Detector for AC Mains | Sampling Circuit Trigger Generator |
Use Scenario: Precise AC zero-crossing detection in smart energy meters for synchronous sampling and harmonic analysis. IC Role / Device Role / Timing Role: Comparator compares isolated AC waveform against 0V reference; internal hysteresis rejects noise near crossing point. Use Value: 1mV offset voltage minimizes timing jitter (<1μs error); –55°C to +125°C rating ensures reliability in outdoor meter enclosures. |
Use Scenario: Generating accurate sample-enable pulses for ADCs in high-resolution data acquisition systems. IC Role / Device Role / Timing Role: Dual comparators create windowed trigger (start/stop) or edge-triggered strobe with matched propagation paths. Use Value: ≤10ns inter-channel skew preserves time-of-arrival integrity; 80ns delay enables sub-12.5MHz sampling clock derivation. |
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 (300ns typ), no rail-to-rail inputs, wider offset (2mV typ), operates only to +70°C | Suitable for cost-sensitive consumer-grade 5V systems where speed and temperature range are noncritical | Select when budget constraints outweigh performance requirements and industrial temperature operation is unnecessary |
| TLV3502IDR | Faster (4.5ns typ), rail-to-rail inputs/outputs, but higher supply current (1.3mA), limited to –40°C to +125°C | Better for ultra-high-speed <10ns timing-critical circuits, but not qualified for –55°C military-grade operation | Choose for nanosecond-scale response in test equipment where extreme cold tolerance is not required |
Compared with LM393DR and TLV3502IDR, MAX942MSA/PR-T uniquely balances military-grade temperature range (–55°C to +125°C), 80ns speed, rail-to-rail inputs, and ultra-low 350μA quiescent current-making it optimal for ruggedized portable instrumentation where power, precision, and environmental resilience are jointly critical.
Availability
MAX942MSA/PR-T is available at Aetrix Electronics and suitable for industrial control systems, aerospace avionics, and battery-powered medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX942MSA/PR-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 markets.
The MAX941/MAX942/MAX944 family was designed specifically for high-speed, low-power, single-supply comparator applications in portable and harsh-environment systems-emphasizing rail-to-rail operation, internal hysteresis, and extended temperature reliability.
FAQ
What is the operating temperature range of the MAX942MSA/PR-T?
The MAX942MSA/PR-T is rated for continuous operation from –55°C to +125°C, verified per Maxim's extended-temperature qualification standards. This range exceeds commercial and industrial grades, making MAX942MSA/PR-T suitable for aerospace, downhole, and military applications where thermal extremes are expected. The device maintains full electrical specifications-including 80ns propagation delay and 1mV offset voltage-across this entire range.
Does the MAX942MSA/PR-T require external pull-up resistors on its outputs?
No, the MAX942MSA/PR-T does not require external pull-up resistors. Its outputs are designed to actively drive high (to V+ – 0.4V min) and low (to 0.4V max) without external components, ensuring direct compatibility with CMOS and TTL logic families. This feature simplifies PCB layout and reduces bill-of-materials count in space-constrained designs using MAX942MSA/PR-T.
How does the internal hysteresis of the MAX942MSA/PR-T improve system reliability?
The internal hysteresis of the MAX942MSA/PR-T creates distinct upper and lower input trip points (typically ~3mV apart), preventing output oscillation during slow or noisy transitions-such as those from thermistors or AC line signals. Unlike external hysteresis networks, this fixed internal value requires no design calculations or resistor placement, eliminating tuning errors and improving consistency across production units using MAX942MSA/PR-T.
Can the MAX942MSA/PR-T interface directly with 3.3V microcontrollers?
Yes, the MAX942MSA/PR-T interfaces directly with 3.3V microcontrollers. Its outputs swing to within 0.4V of V+ and GND, delivering valid logic-high (>2.9V at V+ = 3.3V) and logic-low (<0.4V) levels compatible with standard 3.3V CMOS inputs. Input common-mode range extends from –0.3V to V+ + 0.3V, allowing direct connection to 3.3V reference voltages or sensor outputs without level shifting-key for compact designs using MAX942MSA/PR-T.
What package type and footprint does the MAX942MSA/PR-T use?
The MAX942MSA/PR-T uses an 8-pin SO (Small Outline) package with 1.27mm lead pitch, JEDEC MS-012AC outline, and RoHS-compliant matte tin finish. Its land pattern matches standard SOIC-8 footprints used across industry PCB design tools, enabling drop-in replacement in existing layouts. The "PR-T" suffix confirms tape-and-reel packaging for automated SMT assembly-ensuring seamless integration into high-volume manufacturing workflows using MAX942MSA/PR-T.
MAX942MSA/PR-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:
- 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-T FAQ
1.How can I place an order for MAX942MSA/PR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX942MSA/PR-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 MAX942MSA/PR-T reliable?
The price and inventory of MAX942MSA/PR-T 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-T is usually 5 days.
3.What payment methods are accepted for MAX942MSA/PR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX942MSA/PR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX942MSA/PR-T?
MAX942MSA/PR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX942MSA/PR-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 MAX942MSA/PR-T?
For technical support, including MAX942MSA/PR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX942MSA/PR-T requirements.
6.How does Aetrix verify that MAX942MSA/PR-T is sourced from the original manufacturer or authorized distributors?
All MAX942MSA/PR-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 MAX942MSA/PR-T meets industry standards.
7.What is the process for return or replacement of MAX942MSA/PR-T?
All MAX942MSA/PR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX942MSA/PR-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 MAX942MSA/PR-T part is unused and in its original packaging.
Return procedure for MAX942MSA/PR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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