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Analog Devices Inc./Maxim Integrated MAX985ESA+T
- Part No.:
- MAX985ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX985ESA+T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,256
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Product details
Overview
MAX985ESA+T from Maxim Integrated is a single-channel micropower rail-to-rail input/output comparator with push-pull output stage, operating from 2.5V to 5.5V single supply or ±1.25V to ±2.75V dual supply, consuming only 11µA quiescent current, achieving 300ns propagation delay, and delivering 8mA output drive capability - ideal for low-power zero-crossing detection and threshold monitoring in portable instrumentation.
For engineers reviewing the MAX985ESA+T datasheet, MAX985ESA+T pinout, MAX985ESA+T application, or MAX985ESA+T equivalent, key selection criteria include its 0.5mV typical input offset voltage, ±3mV internal hysteresis, rail-to-rail common-mode range extending 250mV beyond rails, and SO-8 package compatibility with space-constrained industrial sensor interfaces.
Technical Context
The MAX985ESA+T implements a precision CMOS input stage with 1.0pA typical input bias current and no phase reversal under overdriven inputs, enabling reliable operation with high-impedance signal sources. Its push-pull output stage eliminates external pull-up requirements and supports rail-to-rail swing into 8mA loads while limiting supply-current surges during switching.
This comparator integrates internal hysteresis (±3mV) to suppress noise-induced oscillation on slow-moving signals and features 55dB minimum PSRR and 52dB minimum CMRR - critical for stable performance in noisy mixed-signal environments such as battery-powered data acquisition systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 5.5V single supply - supports both 3V and 5V system integration without level-shifting. |
| Quiescent Supply Current | 11µA typical - enables multi-year battery life in always-on sensing nodes. |
| Propagation Delay | 300ns at 100mV overdrive - ensures fast response for timing-critical edge detection. |
| Input Offset Voltage | ±5mV max (–40°C to +85°C) - guarantees accurate threshold comparison across industrial temperature range. |
| Common-Mode Input Range | Extends 250mV beyond rails - allows direct interface to signals exceeding supply boundaries, e.g., ground-referenced AC waveforms. |
| Output Drive Capability | Sinks and sources 8mA - drives LEDs, logic inputs, or small MOSFET gates directly without external buffers. |
| Input Bias Current | 1.0pA typical - preserves signal integrity when used with high-value resistive dividers or piezoelectric sensors. |
Pinout & Package
The MAX985ESA+T is housed in an 8-pin SO (Small Outline) package with standard 150-mil width and 0.050-inch lead pitch, compatible with automated PCB assembly and legacy footprint libraries.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Push-pull comparator output - actively drives high/low to VCC/VEE; no external pull-up required. |
| 2 | IN− | Inverting input - accepts signals up to 0.25V beyond supply rails without phase reversal. |
| 3 | IN+ | Noninverting input - matched input impedance and bias current to IN− for differential accuracy. |
| 4 | VEE | Negative supply terminal - tied to ground in single-supply configurations; supports dual-supply operation down to –2.75V. |
| 5 | N.C. | No connection - internally unconnected; must remain floating or grounded per layout guidelines. |
| 6 | N.C. | No connection - internally unconnected; must remain floating or grounded per layout guidelines. |
| 7 | VCC | Positive supply terminal - supplies power for internal circuitry and output stage; bypass capacitor recommended. |
| 8 | N.C. | No connection - internally unconnected; must remain floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O operation | Enables full dynamic range utilization in low-voltage systems (2.5V–5.5V), maximizing SNR in sensor front-ends. |
| 11µA quiescent current | Reduces average power consumption by >90% versus standard comparators, extending battery runtime in IoT endpoints. |
| 300ns propagation delay | Supports sub-microsecond timing resolution for pulse-width measurement and digital line reception. |
| ±3mV internal hysteresis | Eliminates need for external positive feedback components in noisy environments like motor control feedback loops. |
| No phase reversal on overdrive | Prevents erroneous output states when input transients exceed supply rails - essential for robust fault detection. |
Applications
| Zero-Crossing Detection | Threshold Monitoring |
|---|---|
Use Scenario: Detecting polarity transitions of AC signals (e.g., mains voltage, audio waveforms) in energy metering or audio processing circuits. IC Role / Device Role / Timing Role: Comparator configured with IN− grounded and IN+ receiving AC input - outputs clean digital edges synchronized to zero crossings. Use Value: Achieves jitter-free edge generation due to 300ns delay and internal hysteresis, eliminating false triggers from noise near zero crossing. | Use Scenario: Monitoring battery voltage against preset thresholds to trigger low-battery alerts or power-state transitions in handheld devices. IC Role / Device Role / Timing Role: Precision comparator comparing divided battery voltage to reference - provides deterministic trip points despite supply variation. Use Value: Delivers ±5mV max offset error over temperature, ensuring consistent alert thresholds across –40°C to +85°C operating range. |
| Level Translation | Window Comparator |
Use Scenario: Converting 5V logic signals to 3.3V-compatible levels for interfacing microcontrollers with legacy peripherals. IC Role / Device Role / Timing Role: Push-pull output stage sourcing/sinking current directly into 3.3V logic inputs - avoids open-drain timing uncertainty. Use Value: Eliminates external pull-up resistor and associated RC delay, enabling sub-500ns level translation with rail-to-rail swing. | Use Scenario: Validating that analog sensor output remains within safe operational bounds (e.g., temperature, pressure) before actuation. IC Role / Device Role / Timing Role: Dual-comparator configuration (using two MAX985ESA+T units) detecting upper/lower limits - generates active-high window-in-range flag. Use Value: Leverages matched input characteristics and low 11µA supply current per unit to minimize total system power in always-monitoring safety circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331M5X/NOPB | Higher 80µA supply current; 1.2V to 5.5V supply range; open-drain output requiring pull-up. | Less suitable for ultra-low-power battery systems; requires external resistor for logic-level translation. | Select when cost sensitivity outweighs power budget constraints and open-drain flexibility is preferred. |
| TLV331IDBVR | 17µA supply current; rail-to-rail input only (not output); 1.8V to 5.5V operation; SC70-5 package. | Cannot drive heavy loads directly; limited output swing reduces noise margin in noisy environments. | Choose for compact SC70 layouts where output drive strength is secondary to board area savings. |
Compared with LMV331M5X/NOPB and TLV331IDBVR, the MAX985ESA+T offers the lowest quiescent current (11µA), true rail-to-rail I/O, and integrated hysteresis - making it optimal for precision, low-power threshold detection where output drive and noise immunity are critical.
Availability
MAX985ESA+T is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial threshold monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MAX985ESA+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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and signal conditioning applications.
The MAX985ESA+T belongs to Maxim's micropower comparator product line, designed specifically for ultra-low-power, high-precision voltage comparison in space- and energy-constrained systems such as wearables and remote sensors.
FAQ
What is the maximum capacitive load the MAX985ESA+T can drive while maintaining 300ns propagation delay?
The MAX985ESA+T maintains ≤300ns propagation delay (tPD+) for 100mV overdrive with CL ≤ 15pF at VCC = 5V. At higher loads (e.g., 50pF), delay increases to ~430ns. For designs requiring fast edge response into larger loads, consider adding a buffer stage or reducing trace capacitance through layout optimization. The MAX985ESA+T datasheet specifies these values in the Electrical Characteristics table under tPD+ conditions.
Does the MAX985ESA+T support dual-supply operation, and what are the allowable voltage ranges?
Yes, the MAX985ESA+T supports dual-supply operation with VCC to VEE ranging from ±1.25V to ±2.75V (i.e., total supply up to 5.5V). This allows use in bipolar signal conditioning applications such as audio preamplifier clipping detectors. The device maintains rail-to-rail input common-mode range and 11µA quiescent current across this dual-supply range, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections of the MAX985ESA+T datasheet.
Can the unused N.C. pins on the MAX985ESA+T be left floating, or must they be grounded?
The N.C. pins (pins 5, 6, and 8) on the MAX985ESA+T are not internally connected and may be left floating per Maxim's layout recommendations. However, grounding them improves EMI immunity and simplifies PCB routing - especially in noisy industrial environments. Neither configuration affects electrical performance, but grounding is preferred for robustness. This guidance is explicitly stated in the Pin/Bump Description table and Board Layout section of the MAX985ESA+T datasheet.
How does the internal hysteresis of the MAX985ESA+T affect its use in precision threshold applications?
The MAX985ESA+T includes ±3mV internal hysteresis to prevent output oscillation on slow-moving or noisy inputs - beneficial for reliability in real-world conditions. In precision threshold applications requiring sub-millivolt accuracy, this hysteresis introduces a 6mV deadband; users must account for it in trip-point calculations or disable it via external circuitry if absolute precision is mandatory. The hysteresis value is specified in the Electrical Characteristics table of the MAX985ESA+T datasheet.
Is the MAX985ESA+T RoHS-compliant, and what does the '+' suffix in the part number indicate?
Yes, the MAX985ESA+T is RoHS-compliant and lead(Pb)-free, as indicated by the '+' suffix in the part number per Maxim's packaging nomenclature. This designation confirms compliance with EU Directive 2011/65/EU and related environmental standards. The device uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 requirements, verified in the Package Information section of the MAX985ESA+T datasheet.
MAX985ESA+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:
- 1
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 5.5V, ±1.25V ~ 2.75V
- :
- 5mV @ 5.5V
- Voltage - Input Offset (Max):
- 1pA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 24µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 450ns
- Propagation Delay (Max):
- ±3mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX985ESA+T FAQ
1.How can I place an order for MAX985ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX985ESA+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 MAX985ESA+T reliable?
The price and inventory of MAX985ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX985ESA+T is usually 5 days.
3.What payment methods are accepted for MAX985ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX985ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX985ESA+T?
MAX985ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX985ESA+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 MAX985ESA+T?
For technical support, including MAX985ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX985ESA+T requirements.
6.How does Aetrix verify that MAX985ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX985ESA+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 MAX985ESA+T meets industry standards.
7.What is the process for return or replacement of MAX985ESA+T?
All MAX985ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX985ESA+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 MAX985ESA+T part is unused and in its original packaging.
Return procedure for MAX985ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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