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Analog Devices Inc./Maxim Integrated MAX971CUA+
- Part No.:
- MAX971CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX971CUA+.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:202
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Product details
Overview
The MAX971CUA+ from Maxim Integrated is a single, ultra-low-power, open-drain comparator with internal 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), draws ≤4µA supply current over temperature, supports rail-to-rail input down to V− and within 1.3V of V+, and features separate GND pin for output stage-enabling bipolar-to-single-ended level translation in battery-powered threshold detection systems.
For engineers reviewing the MAX971CUA+ datasheet, MAX971CUA+ pinout, MAX971CUA+ application, or MAX971CUA+ equivalent, key selection criteria include its micropower operation (<4µA), integrated ±1% reference, hysteresis programmability without external feedback, open-drain output with 11V output range referenced to GND, and µMAX-8 package suitability for space-constrained portable designs.
Technical Context
The MAX971CUA+ integrates a precision bandgap reference (1.182V ±1%, 0°C to +70°C) and a single comparator with input common-mode range extending from V− to (V+ − 1.3V). Its HYST pin enables user-defined hysteresis using two external resistors, eliminating need for positive-feedback networks.
Output stage uses an N-channel MOSFET sinking to dedicated GND pin (Pin 1), enabling level-shifting between bipolar supplies (e.g., ±5V) and single-ended logic (e.g., 3.3V/5V), while maintaining full 11V output swing capability even when V+ = V− = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 2.5V to 11V; Dual: ±1.25V to ±5.5V - supports direct interface with Li-ion battery (2.7–4.2V), 3.3V/5V logic, and legacy ±5V systems. |
| Quiescent Supply Current | ≤4µA over temperature - enables multi-year operation on coin-cell batteries in always-on sensor monitors. |
| Reference Voltage Accuracy | 1.182V ±1% (0°C to +70°C) - provides stable, factory-trimmed threshold for precision undervoltage/overvoltage detection without external components. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - allows direct sensing of signals near supply rails, e.g., battery voltage monitoring down to 0V ground reference. |
| Propagation Delay | 12µs (10mV overdrive, 100pF load, 1MΩ pullup) - balances speed and power for low-frequency event detection (e.g., power-good assertion, battery switchover). |
| Output Sink Capability | 50mA max at VOUT = 0.4V (IOUT = 1.8mA typical) - drives standard logic inputs, LEDs, or small MOSFET gates without external buffer. |
| Reference Output Drive | Sinks 4µA / Sources 6µA (min) - sufficient to bias HYST resistors and drive light loads without degrading accuracy. |
Pinout & Package
MAX971CUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), pin-compatible with industry-standard SO-8 and DIP-8 footprints but with 55% smaller area. The package uses gull-wing leads and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Dedicated output-stage ground - decouples comparator output sink path from signal ground, enabling clean level translation across supply domains. |
| 2 | V− | Negative supply - tied to GND in single-supply mode; used as reference for REF and input common-mode range. |
| 3 | IN+ | Noninverting input - accepts signals from V− to (V+ − 1.3V); high-impedance (±0.01nA leakage) minimizes loading on sensor outputs. |
| 4 | IN− | Inverting input - matched to IN+ for offset cancellation; used with REF or divider networks for threshold comparison. |
| 5 | HYST | Hysteresis control - voltage between REF and HYST sets hysteresis band (max 100mV); eliminates chatter in noisy input environments. |
| 6 | REF | 1.182V reference output - referenced to V−, not GND; ±1% accuracy enables ±11.8mV absolute threshold tolerance at 1V scale. |
| 7 | V+ | Positive supply - powers internal circuitry and defines output high-level pullup limit when external resistor is used. |
| 8 | OUT | Open-drain N-channel output - sinks to Pin 1 (GND); supports wire-OR, I²C-style bus sharing, and level shifting up to 11V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA over full operating temperature ensures >10-year shelf life in coin-cell–powered IoT endpoints. |
| Integrated ±1% voltage reference | Eliminates external reference IC and trimming, reducing BOM count and layout area by ≥3 components in threshold detectors. |
| HYST pin with resistor-programmable hysteresis | Enables precise, repeatable hysteresis (e.g., 20mV–100mV) without op-amp feedback loops or complex calculations. |
| Separate GND pin for output stage | Allows output to sink to system GND while inputs reference V−, enabling robust bipolar-to-unipolar conversion in industrial analog front-ends. |
| 11V open-drain output swing | Permits direct interface with 5V/3.3V logic, PLC inputs, or optocouplers without level-shifter ICs or discrete transistors. |
Applications
| Threshold Detector | Level Translator |
|---|---|
Use Scenario: Monitoring lithium battery voltage during discharge to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Single comparator compares battery voltage (via resistor divider) against internal 1.182V reference; HYST pin adds 50mV hysteresis to prevent oscillation near threshold. Use Value: Eliminates external reference and hysteresis components, reducing solution size by 40% and power consumption by 95% vs. discrete op-amp + Zener solution. | Use Scenario: Converting ±5V analog sensor output to 3.3V logic-compatible signal for microcontroller ADC input. IC Role / Device Role / Timing Role: Comparator acts as rail-to-rail input receiver; REF sets mid-scale threshold; OUT sinks to GND while V− = −5V, translating negative input excursions to logic-low pulses. Use Value: Achieves accurate bipolar-to-unipolar conversion with no external level-shifting resistors or supply rails beyond existing ±5V and 3.3V domains. |
| Window Comparator | Oscillator Circuit |
Use Scenario: Validating regulated 5V supply stays within 4.75V–5.25V window in medical instrumentation. IC Role / Device Role / Timing Role: Two MAX971CUA+ units configured as high- and low-threshold comparators; outputs wire-ORed to generate active-high POWER_GOOD signal. Use Value: Delivers ±1% threshold accuracy and 100mV programmable hysteresis per channel, ensuring reliable power sequencing without calibration. | Use Scenario: Building low-power relaxation oscillator for LED blink timing in wearables. IC Role / Device Role / Timing Role: Comparator charges/discharges capacitor via REF and HYST pins; hysteresis band and RC time constant define oscillation period (e.g., 1Hz @ 100nF + 10MΩ). Use Value: Enables self-timed oscillation using only one IC and two passive components-no quartz crystal, timer IC, or additional power supply required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX981CUA+ | Same pinout and µMAX-8 package; internal reference accuracy ±2% (vs. ±1%); identical supply current and hysteresis architecture. | Acceptable where ±2% threshold tolerance suffices (e.g., non-critical battery alerts); lower cost alternative for high-volume consumer devices. | Select MAX981CUA+ when reference accuracy requirement relaxes to ±2% and cost sensitivity outweighs 1% precision benefit. |
| TLV3701IDBVR | Single micropower comparator (600nA), no internal reference; rail-to-rail input; push-pull output (not open-drain); SOT-23-5 package. | Requires external reference and pullup resistor; unsuitable for wire-OR or level-shifting; better for low-noise, high-speed (<10µs) applications. | Choose TLV3701IDBVR only if open-drain output and integrated reference are unnecessary and sub-µA supply current is mandatory. |
Compared with MAX981CUA+, the MAX971CUA+ delivers tighter reference accuracy for precision thresholding, while TLV3701IDBVR offers lower quiescent current but lacks integrated reference and open-drain flexibility-making MAX971CUA+ optimal for space- and power-constrained level-shifting detector designs.
Availability
MAX971CUA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, level translators, and oscillator circuits requiring stable component supply, long-term obsolescence management, and guaranteed traceable sourcing.
Supply support for MAX971CUA+ 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, communications, and computing markets.
The MAX971CUA+ belongs to Maxim's ultra-low-power comparator family designed specifically for energy-sensitive applications such as portable medical devices, remote sensors, and always-on IoT edge nodes where micropower operation and integrated precision references reduce system complexity.
FAQ
What is the maximum supply voltage for MAX971CUA+ in single-supply operation?
The MAX971CUA+ supports a single-supply voltage range of 2.5V to 11V. When operated with V− tied to GND, the maximum total supply voltage (V+ − V−) remains 11V. Exceeding 11V risks permanent damage, as specified in Absolute Maximum Ratings. Operation below 2.5V is not guaranteed and degrades reference functionality and propagation delay performance.
Does MAX971CUA+ require external components to implement hysteresis?
Yes, but only two resistors: R1 between REF and HYST, and R2 between HYST and V−. This configuration leverages the internal HYST pin to generate precise, programmable hysteresis (up to 100mV band) without external op-amps or feedback networks. Connecting HYST directly to REF disables hysteresis. The MAX971CUA+ datasheet provides exact equations for R1/R2 based on desired hysteresis voltage and reference output capability.
Can MAX971CUA+ be used with dual supplies like ±5V?
Yes. The MAX971CUA+ supports dual supplies from ±1.25V to ±5.5V. In this configuration, V+ connects to +5V, V− connects to −5V, and GND (Pin 1) remains connected to system ground. The output sinks to Pin 1 (GND), enabling level translation between the ±5V analog domain and 0–5V digital domain. Input common-mode range extends from −5V to +3.7V, accommodating full bipolar signal swings.
What is the purpose of the separate GND pin (Pin 1) on MAX971CUA+?
The separate GND pin (Pin 1) isolates the output-stage ground from the signal-reference ground (V−). This allows the output transistor to sink current to system GND while comparator inputs remain referenced to V−-enabling clean bipolar-to-single-ended conversion. For example, with V− = −5V and V+ = +5V, the output can drive a 3.3V logic input referenced to 0V, without injecting noise or ground-loop currents into the analog signal path.
How accurate is the internal reference voltage of MAX971CUA+ over temperature?
The MAX971CUA+ internal reference is specified as 1.182V ±1% over the commercial temperature range (0°C to +70°C). Typical drift is ±100ppm/°C, resulting in <±1.5mV total deviation across the range. This accuracy is factory-trimmed and does not require external calibration. For extended temperature operation (−40°C to +85°C), the reference tolerance widens to ±2%, as documented in the MAX971EPA/E SA variants.
MAX971CUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX971CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX971CUA+ 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+ reliable?
The price and inventory of MAX971CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX971CUA+ is usually 5 days.
3.What payment methods are accepted for MAX971CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX971CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX971CUA+?
MAX971CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX971CUA+ 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+?
For technical support, including MAX971CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX971CUA+ requirements.
6.How does Aetrix verify that MAX971CUA+ is sourced from the original manufacturer or authorized distributors?
All MAX971CUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX971CUA+?
All MAX971CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX971CUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX971CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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