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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 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The 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 - ideal for interfacing with CMOS/TTL logic in battery-powered instrumentation.
For engineers reviewing the MAX942MSA/PR+ datasheet, MAX942MSA/PR+ pinout, MAX942MSA/PR+ application, or MAX942MSA/PR+ equivalent, key selection considerations include its -55°C to +125°C operating range, SO-8 package, internal hysteresis for noise immunity, rail-to-rail input common-mode range extending beyond supply rails, and guaranteed output drive without external pullups.
Technical Context
The MAX942MSA/PR+ implements a bipolar process-based comparator core 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 from 2.7V to 5.5V, it achieves 80ns propagation delay across temperature (-55°C to +125°C) with <10ns channel-to-channel skew. Input offset voltage is 1–3mV over full temperature range, and common-mode rejection ratio exceeds 80μV/V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports direct interface with 3.3V and 5V logic domains without level shifters |
| Propagation Delay | 80ns (typical, 5mV overdrive) - enables sampling of >10MHz analog signals with deterministic timing |
| Supply Current per Comparator | 350μA (typical at 3V) - allows dual-channel operation under 700μA total, critical for low-power portable designs |
| Input Offset Voltage | 1–3mV (over -55°C to +125°C) - ensures accurate threshold detection across extended industrial/military temperature ranges |
| Rail-to-Rail Input Range | -0.2V to V+ + 0.2V - permits direct sensing of signals below GND or above V+, e.g., sensor outputs with negative transients |
| Output Voltage Swing | VOL = 0.2V / VOH = V+ − 0.2V (at 400μA) - guarantees TTL/CMOS-compatible logic levels without external pullup resistors |
| Input Common-Mode Rejection | ≥80μV/V - maintains accuracy when input common-mode voltage varies across full supply range |
Pinout & Package
MAX942MSA/PR+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 1.27mm pitch and gull-wing leads. Thermal resistance θJA = 170°C/W (SO-8, JEDEC std PCB).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply input (2.7V–5.5V); must be decoupled with 0.1μF ceramic capacitor placed adjacent to pin |
| 2 | OUTB | Comparator B open-drain-like output; sinks up to 4mA, sources minimal current - requires external pullup for high-level assertion |
| 3 | INB− | Inverting input for comparator B; accepts rail-to-rail common-mode voltage; protected against ±20mA continuous fault current |
| 4 | INB+ | Noninverting input for comparator B; identical electrical specs to INB−; differential clamp voltage = 2.2V |
| 5 | GND | Analog/digital ground reference; must connect to low-inductance ground plane for stable high-speed operation |
| 6 | INA+ | Noninverting input for comparator A; shares same input stage architecture and protection as INB± |
| 7 | INA− | Inverting input for comparator A; fully interchangeable with INB± in layout; supports short-circuit tolerance to either rail |
| 8 | OUTA | Comparator A output; electrically identical to OUTB - both outputs are push-pull capable of driving CMOS/TTL loads directly |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.2V beyond both supply rails (−0.2V to V+ + 0.2V), enabling direct interface with sensors or transducers generating out-of-supply signals |
| Internal hysteresis | 1mV typical input-referred width eliminates need for external positive feedback resistors and prevents oscillation on slow or noisy inputs |
| 80ns propagation delay | Guaranteed across full −55°C to +125°C range, supporting precise timing in motor control feedback loops and digital sampling circuits |
| Low 350μA/comparator supply current | Enables dual-channel high-speed comparison in always-on battery-powered nodes with sub-1mA total quiescent draw |
| CMOS/TTL-compatible outputs | VOH ≥ V+ − 0.2V and VOL ≤ 0.4V at 4mA load ensure reliable logic-level translation without external level-shifting circuitry |
| Robust input fault tolerance | All inputs withstand continuous short-circuit to either supply rail, simplifying system-level ESD and surge protection design |
Applications
| 3V Battery-Powered Threshold Detection | Industrial Motor Control Feedback |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.2V with ±10mV accuracy. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel compares against upper threshold, second against lower threshold. Use Value: Rail-to-rail inputs accept 0–4.5V cell voltage directly; 1mV offset ensures <10mV total error budget; 80ns response enables fast shutdown before overvoltage damage. |
Use Scenario: Converting back-EMF zero-crossing signals from BLDC motor windings into commutation timing pulses. IC Role / Device Role / Timing Role: High-speed comparator with internal hysteresis rejects PWM noise while detecting precise zero crossings for six-step commutation. Use Value: 80ns delay ensures <1° electrical angle timing error at 20kHz PWM; rail-to-rail inputs accommodate varying back-EMF amplitudes across speed range. |
| Avionics Signal Conditioning | Automotive Sensor Interface |
Use Scenario: Level-shifting and noise-immune conversion of 0–5V analog sensor outputs (e.g., pressure transducers) to 3.3V digital logic in flight control units. IC Role / Device Role / Timing Role: Dual comparator used for redundant signal validation and analog-to-digital decision gating in DO-254-compliant hardware. Use Value: −55°C to +125°C rating meets MIL-STD-810 thermal requirements; internal hysteresis eliminates external RC filters; 350μA/channel minimizes power in sealed avionics enclosures. |
Use Scenario: Interfacing thermistor-based coolant temperature sensors (0–100°C, 10kΩ–100Ω) to microcontroller ADC inputs via voltage divider and threshold alert generation. IC Role / Device Role / Timing Role: Comparator provides overtemperature latch-out function independent of MCU firmware execution. Use Value: Guaranteed operation at −40°C startup and +125°C under-hood conditions; rail-to-rail inputs tolerate sensor bias drift; low supply current extends battery life during key-off monitoring. |
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/ch), no rail-to-rail inputs (common-mode limited to V+ − 1.5V), no internal hysteresis | Suitable only for low-frequency (<10kHz) threshold detection where speed and input range are noncritical | Select only if cost is primary constraint and performance margins allow 16× slower response and reduced input flexibility |
| TLV3502IDR | Faster (4.5ns delay), lower supply current (120μA/ch), rail-to-rail inputs/outputs, but rated only to +105°C (not −55°C) | Preferred for high-speed data acquisition or laser pulse detection where extreme temperature range is not required | Choose when nanosecond timing dominates over extended temperature operation; verify SO-8 footprint compatibility (same pinout) |
Compared with LM393DR and TLV3502IDR, the MAX942MSA/PR+ uniquely balances military-grade temperature range (−55°C to +125°C), 80ns speed, rail-to-rail input capability, and integrated hysteresis - making it the only option among the three qualified for high-reliability embedded control in harsh environments without external component additions.
Availability
MAX942MSA/PR+ is available at Aetrix Electronics and suitable for industrial motor control, avionics signal conditioning, and automotive sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
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 precision analog, mixed-signal, and high-reliability ICs for industrial, automotive, and communications markets.
The MAX94x family was designed specifically for high-speed, low-power, single-supply comparator applications in portable and ruggedized systems - emphasizing rail-to-rail operation, internal hysteresis, and extended temperature performance without external components.
FAQ
What is the operating temperature range of the MAX942MSA/PR+?
The MAX942MSA/PR+ is specified for operation from −55°C to +125°C, validated across this full range for propagation delay, input offset voltage, and output drive capability. This makes it suitable for deployment in aerospace, defense, and under-hood automotive environments where extreme thermal cycling occurs. The SO-8 package's thermal characteristics are characterized per JEDEC standards to ensure reliability at these limits.
Does the MAX942MSA/PR+ require external pullup resistors on its outputs?
No, the MAX942MSA/PR+ does not require external pullup resistors. Its outputs are push-pull and can source up to 400μA while maintaining VOH ≥ V+ − 0.2V and sink up to 4mA while holding VOL ≤ 0.4V - sufficient to directly drive CMOS and TTL logic inputs. External pullups are unnecessary unless interfacing with open-drain buses or specific voltage-level translation requirements.
How does the internal hysteresis of the MAX942MSA/PR+ improve noise immunity?
The MAX942MSA/PR+ features fixed internal hysteresis of approximately 1mV (input-referred), creating distinct upper and lower trip points. This prevents output chatter when input signals hover near the threshold due to noise or slow slew rates. Unlike comparators requiring external hysteresis resistors, the MAX942MSA/PR+ achieves this with zero external components, reducing board space and eliminating resistor tolerance errors in precision threshold applications.
Can the MAX942MSA/PR+ operate from a 2.7V supply?
Yes, the MAX942MSA/PR+ is fully specified to operate from 2.7V to 5.5V. At 2.7V, it maintains 80ns typical propagation delay, 350μA per comparator supply current, and rail-to-rail input operation down to −0.2V. This enables direct integration into modern 3.3V and 2.7V systems such as IoT edge sensors and ultra-low-power wearables without voltage regulation overhead.
What is the maximum differential input voltage the MAX942MSA/PR+ can tolerate?
The MAX942MSA/PR+ can tolerate a continuous differential input voltage of −0.3V to (V+ + 0.3V), with internal back-to-back diode clamping limiting differential stress to ~2.2V. Inputs are also rated for continuous short-circuit fault conditions to either supply rail. This robustness eliminates the need for external series resistors or TVS diodes in many industrial and automotive front-end signal conditioning designs.
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:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.5V
- :
- 2mV @ 5.5V
- Voltage - Input Offset (Max):
- 0.4µA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 600µA
- Current - Quiescent (Max):
- 36.06dB CMRR, 36.06dB PSRR
- CMRR, PSRR (Typ):
- 200ns
- 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.
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