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Analog Devices Inc./Maxim Integrated MAX971CUA+T
- Part No.:
- MAX971CUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX971CUA+T.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,499
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Product details
Overview
The MAX971CUA+T from Maxim Integrated is a single, ultra-low-power, open-drain comparator with integrated 1.182V ±1% voltage reference and programmable hysteresis via HYST pin. It operates from 2.5V to 11V single supply (or ±1.25V to ±5.5V dual supply), draws ≤4µA quiescent current over temperature, supports rail-to-rail input common-mode range down to V− and up to V+ − 1.3V, and is used in battery-powered threshold detection and level translation circuits.
For engineers reviewing the MAX971CUA+T datasheet, MAX971CUA+T pinout, MAX971CUA+T application, or MAX971CUA+T equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in low-voltage sensing and bipolar-to-single-ended conversion, and two technically documented alternative parts for design flexibility.
Technical Context
The MAX971CUA+T integrates a precision bandgap reference (1.182V ±1%, 0°C to +70°C) and a single comparator with open-drain output sinking to GND - enabled by its dedicated GND pin separate from V−. Its HYST pin allows hysteresis programming using two external resistors without feedback loops or complex calculations.
Input stage supports operation with inputs extending 300mV beyond supply rails; output tolerates up to 11V above V− and remains functional even with no supply applied. Propagation delay is 12µs (10mV overdrive, 100pF load, 1MΩ pullup), and output low voltage is ≤0.4V at 1.8mA sink current under 5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 2.5V to 11V; dual: ±1.25V to ±5.5V - enables direct use in 3V/5V systems and bipolar signal conditioning. |
| Quiescent Supply Current | ≤4µA over temperature - ensures multi-year battery life in always-on sensor nodes and portable equipment. |
| Reference Voltage Accuracy | 1.182V ±1% (0°C to +70°C) - provides stable, factory-trimmed threshold for precision undervoltage/overvoltage detection. |
| Input Common-Mode Range | V− to V+ − 1.3V - supports sensing near ground or high-side signals without level-shifting circuitry. |
| Propagation Delay | 12µs (10mV overdrive, 100pF load, 1MΩ pullup) - balances speed and power for low-frequency monitoring applications. |
| Output Configuration | Open-drain with separate GND pin - permits wire-ORing, level translation up to 11V, and bipolar-to-single-ended conversion. |
| Input Offset Voltage | ±10mV - defines minimum detectable differential voltage without external amplification. |
Pinout & Package
MAX971CUA+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), pin-compatible with industry-standard SO and DIP footprints. The package features exposed pad for thermal enhancement and is RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for output stage; connect to system GND (not V−) for single-supply operation. |
| 2 | V− | Negative supply rail; tie to GND for single-supply use; sets reference and input common-mode baseline. |
| 3 | IN+ | Noninverting comparator input; accepts signals from V− to V+ − 1.3V with ±0.01nA leakage. |
| 4 | IN− | Inverting comparator input; matched offset and leakage to IN+ for accurate differential sensing. |
| 5 | HYST | Hysteresis control input; voltage range REF − 0.05V to REF - sets hysteresis band up to 100mV. |
| 6 | REF | 1.182V ±1% reference output referenced to V−; sources/sinks up to 25µA/15µA. |
| 7 | V+ | Positive supply rail; supplies gate drive for output MOSFET and determines output sink capability. |
| 8 | OUT | Open-drain N-channel output sinking to GND; supports 11V max output voltage and 50mA short-circuit current. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA over full operating temperature - extends battery runtime in IoT sensors and wearables. |
| Integrated ±1% voltage reference | 1.182V referenced to V−, not GND - eliminates external reference IC and reduces BOM count in threshold detectors. |
| Programmable hysteresis | Simple two-resistor network on HYST pin - avoids unstable positive-feedback designs and saves PCB area. |
| Separate GND for output stage | Dedicated Pin 1 GND - enables true level translation between bipolar (±5V) and single-ended (3.3V/5V) domains. |
| Rail-to-rail input capability | Operates with inputs as low as V− and as high as V+ − 1.3V - simplifies interface to ADCs, microcontrollers, and analog sensors. |
Applications
| Battery-Powered Threshold Detection | Level Translation (Bipolar → Single-Ended) |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during discharge to trigger low-battery shutdown before cutoff. IC Role / Device Role / Timing Role: Comparator compares cell voltage against 1.182V reference scaled by resistor divider; HYST pin adds 20mV hysteresis to prevent chatter near threshold. Use Value: Eliminates need for external reference and hysteresis components; 4µA supply current enables >10-year shelf life in coin-cell applications. |
Use Scenario: Converting ±5V op-amp output signals to 0–3.3V logic levels for MCU input. IC Role / Device Role / Timing Role: MAX971CUA+T acts as level translator: ±5V input drives IN+ while REF (1.182V) biases IN−; open-drain OUT pulls to 3.3V via external pullup. Use Value: Leverages 11V output voltage rating and separate GND pin to safely translate beyond supply rails without clamping diodes or level-shifters. |
| Window Comparator (with External Components) | Oscillator Circuit (Relaxation Type) |
|
Use Scenario: Detecting if a 5V supply stays within 4.5V–5.5V "power-good" window in embedded power management. IC Role / Device Role / Timing Role: Used with external resistors to form upper/lower thresholds; HYST pin configures hysteresis to suppress noise-induced false triggers. Use Value: Achieves precise window detection with <1% reference accuracy and <10mV effective hysteresis resolution - no trimming required. |
Use Scenario: Generating low-frequency clock signals (e.g., 1–10Hz) for LED blinkers or watchdog timers in energy-constrained devices. IC Role / Device Role / Timing Role: Configured as relaxation oscillator: capacitor charges through resistor to REF voltage, then discharges via OUT when threshold crossed. Use Value: Uses internal reference and ultra-low IQ to sustain oscillation with <5µA average current - ideal for maintenance-free timing in remote sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921CSA+ | Same 1% reference, but no HYST pin; complementary (push-pull) output instead of open-drain. | Requires external hysteresis circuitry; unsuitable for wire-OR or level-shifting without added components. | Select when push-pull drive is needed and board space allows discrete hysteresis implementation. |
| TLV3701IDBVR | Lower 1.2µA IQ, rail-to-rail input, but no integrated reference; ±2% external reference typically required. | Higher design complexity for precision thresholding; better suited for ultra-low-power apps where reference is already present. | Select when system-level reference exists and sub-2µA supply current is critical - adds BOM and layout overhead. |
Compared with MAX921CSA+ and TLV3701IDBVR, the MAX971CUA+T uniquely combines integrated ±1% reference, programmable hysteresis, and open-drain output with GND-referenced sink - delivering lowest component count and highest integration for battery-operated threshold detection.
Availability
MAX971CUA+T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, level translators, and oscillator circuits requiring stable component supply across industrial and consumer electronics programs.
Supply support for MAX971CUA+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 and mixed-signal ICs for power, sensing, and interface applications.
The MAX971CUA+T belongs to the MAX97x/MAX98x micropower comparator family, designed specifically for ultra-low-power sensing, battery monitoring, and precision threshold detection in portable and energy-harvesting systems.
FAQ
What is the maximum supply voltage for MAX971CUA+T?
The MAX971CUA+T supports a single-supply voltage range of 2.5V to 11V, or dual supplies from ±1.25V to ±5.5V. Absolute maximum ratings allow V+ to V− up to 12V, and output voltage up to 12V above V−. Exceeding 11V supply may degrade reference accuracy and increase stress on internal structures.
Does MAX971CUA+T require an external reference?
No, the MAX971CUA+T includes an internal 1.182V ±1% bandgap voltage reference accessible at the REF pin. This reference is referenced to V− (not GND), and can source up to 25µA or sink up to 15µA - sufficient to drive typical resistor-divider networks for threshold setting without external components.
How is hysteresis implemented on MAX971CUA+T?
Hysteresis is implemented using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band (VHB) ≈ 2 × (VREF − VHYST), adjustable from 0mV to 100mV. For example, setting VHYST = REF − 25mV yields ~50mV hysteresis - eliminating external feedback and simplifying layout.
Can MAX971CUA+T operate from a 3V supply?
Yes, the MAX971CUA+T is fully specified for 3V single-supply operation. At 3V, supply current remains ≤4µA, input common-mode range extends from V− to V+ − 1.3V (i.e., 0V to 1.7V), and propagation delay increases slightly to ~15µs (10mV overdrive). All electrical characteristics in the datasheet include 3V test conditions.
What is the function of the separate GND pin on MAX971CUA+T?
Pin 1 (GND) is the ground reference for the output-stage N-channel MOSFET - independent of V−. This allows the output to sink current to system GND while V− is tied to a different potential (e.g., −5V), enabling true level translation and bipolar-to-single-ended conversion without level-shifting circuitry.
MAX971CUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 4µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX971CUA+T FAQ
1.How can I place an order for MAX971CUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX971CUA+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 MAX971CUA+T reliable?
The price and inventory of MAX971CUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX971CUA+T is usually 5 days.
3.What payment methods are accepted for MAX971CUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX971CUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX971CUA+T?
MAX971CUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX971CUA+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 MAX971CUA+T?
For technical support, including MAX971CUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX971CUA+T requirements.
6.How does Aetrix verify that MAX971CUA+T is sourced from the original manufacturer or authorized distributors?
All MAX971CUA+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 MAX971CUA+T meets industry standards.
7.What is the process for return or replacement of MAX971CUA+T?
All MAX971CUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX971CUA+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 MAX971CUA+T part is unused and in its original packaging.
Return procedure for MAX971CUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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