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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:2,550
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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), draws ≤4µA over temperature, supports rail-to-rail input down to V− and within 1.3V of V+, and features separate GND for output stage-enabling bipolar-to-single-ended level translation in battery-powered threshold detection.
For engineers reviewing the MAX971CUA-T datasheet, MAX971CUA-T pinout, MAX971CUA-T application, or MAX971CUA-T equivalent, key selection criteria include its 4µA quiescent current, 1.182V ±1% internal reference accuracy, 12µs propagation delay at 10mV overdrive, open-drain output with 11V swing, and µMAX-8 package compatibility with space-constrained portable systems.
Technical Context
The MAX971CUA-T integrates a precision bandgap reference referenced to V− (not GND) and a single comparator with input common-mode range extending from V− to (V+ − 1.3V). Its HYST pin enables simple resistor-based hysteresis programming without external feedback, delivering deterministic threshold band control up to 100mV.
Output stage uses an N-channel MOSFET sinking to dedicated GND pin-decoupling output logic ground from analog supply rails-making it suitable for level-shifting between ±5V inputs and 3.3V/5V logic domains while maintaining low power across extended temperature (0°C to +70°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 11V single supply; enables operation from coin-cell (3V) to industrial 10V rails |
| Quiescent Current | ≤4µA over temperature; ensures multi-year battery life in always-on sensor nodes |
| Reference Voltage | 1.182V ±1% (0°C to +70°C); provides stable, factory-trimmed threshold source without external components |
| Propagation Delay | 12µs at 10mV overdrive; balances speed and ultra-low power for wake-up and alert circuits |
| Input Common-Mode Range | V− to (V+ − 1.3V); supports direct sensing of signals near supply rails in single-supply systems |
| Output Configuration | Open-drain with separate GND pin; allows wire-ORing and level translation up to 11V output swing |
| Hysteresis Control | HYST pin accepts REF − 50mV to REF; enables precise 0–100mV hysteresis band via two resistors |
Pinout & Package
Package: 8-pin µMAX (3mm × 3mm, 0.5mm pitch), thermally enhanced, lead-free, RoHS-compliant surface-mount package optimized for high-density portable PCBs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Dedicated output-stage ground; isolates digital switching noise from analog reference and comparator inputs |
| 2 | V− | Negative supply rail; tied to GND in single-supply mode; defines reference and input offset baseline |
| 3 | IN+ | Noninverting comparator input; accepts signals from V− to (V+ − 1.3V) with <±10mV offset |
| 4 | IN− | Inverting comparator input; matched to IN+ for precision differential threshold detection |
| 5 | HYST | Hysteresis control input; sets upper/lower thresholds by voltage divider from REF; range: REF − 50mV to REF |
| 6 | REF | 1.182V ±1% reference output referenced to V−; sources/sinks up to 25µA/15µA |
| 7 | V+ | Positive supply rail; powers internal circuitry and determines output sink strength and speed |
| 8 | OUT | Open-drain N-MOS output sinking to Pin 1 (GND); supports 11V max output voltage and 50mA sink capability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | ≤4µA over full temperature range-enables >10-year operation on CR2032 in wake-on-event systems |
| Integrated ±1% reference | Eliminates external voltage reference IC and trimming resistors, reducing BOM count and layout area |
| Programmable hysteresis | Two-resistor HYST configuration delivers repeatable, adjustable noise margin without op-amp feedback loops |
| Separate output GND pin | Enables clean level translation between isolated power domains (e.g., ±5V analog → 3.3V logic) |
| Wide supply range | 2.5V–11V single supply or ±1.25V–±5.5V dual supply-supports legacy and modern mixed-voltage systems |
Applications
| Threshold Detector | Level Translator |
|---|---|
Use Scenario: Monitoring battery voltage in a wearable health monitor to trigger low-battery warning at 2.8V. IC Role / Device Role / Timing Role: Single comparator compares divided battery voltage against internal 1.182V reference; HYST pin adds 20mV hysteresis to prevent chatter near threshold. Use Value: Eliminates external reference and reduces total solution size by 30% versus discrete comparator + reference design. | Use Scenario: Converting ±5V RS-232 receive signal to 3.3V logic-compatible input for an MCU UART. IC Role / Device Role / Timing Role: Comparator acts as rail-to-rail input receiver with REF biased to mid-rail; OUT drives 3.3V pull-up while sinking to dedicated GND. Use Value: Achieves 11V output swing and noise-immune translation without level-shifter IC or discrete transistor array. |
| Window Comparator | Oscillator Circuit |
Use Scenario: Validating regulated 5V supply in an IoT gateway-asserting "power good" only when voltage stays between 4.75V and 5.25V. IC Role / Device Role / Timing Role: Two MAX971CUA-T units (one for undervoltage, one for overvoltage) wired-OR their open-drain outputs to generate active-high PG signal. Use Value: Uses identical parts for both thresholds, simplifying inventory and enabling matched hysteresis via shared REF/HYST network. | Use Scenario: Building a low-power relaxation oscillator for real-time clock backup timing in a smart meter. IC Role / Device Role / Timing Role: Comparator charges/discharges external capacitor through resistor; REF and HYST set trip points; OUT toggles charging path. Use Value: Draws only 4µA average current while generating stable 1Hz–1kHz square wave-no crystal or external timer required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX981CUA-T | Same pinout and µMAX-8 package; ±2% reference (vs. ±1%) and identical 4µA supply current | Acceptable where reference tolerance >1% is permissible; lower cost in high-volume consumer designs | Select MAX981CUA-T when ±2% reference accuracy meets system threshold stability requirements and cost sensitivity is high |
| TLV3701IDBVR | Single comparator in SOT-23-6; no internal reference; 1.8µA supply current; rail-to-rail input; push-pull output | Requires external reference and pull-up; better for low-voltage (1.8V) operation but lacks level-shifting GND pin | Select TLV3701IDBVR when operating below 2.5V or when push-pull output is preferred over open-drain |
Compared with MAX981CUA-T, the MAX971CUA-T offers tighter reference accuracy for precision thresholding; compared with TLV3701IDBVR, it integrates reference and enables true bipolar-to-single-ended translation-critical for legacy interface bridging without added components.
Availability
MAX971CUA-T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, window comparators, and level translators requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.
The MAX97x/MAX98x comparator family was designed for ultra-low-power sensing and monitoring in portable and energy-harvesting systems-emphasizing micropower operation, integrated references, and flexible supply configurations.
FAQ
What is the maximum supply voltage for the MAX971CUA-T?
The MAX971CUA-T supports a maximum single-supply voltage of 11V (V+ to V−), or ±5.5V dual supply. Absolute maximum ratings specify V+ to V− up to +12V, but functional operation is guaranteed only up to 11V. Exceeding 11V risks parametric degradation or reliability impact. The MAX971CUA-T maintains full specification compliance-including 4µA supply current and 1.182V reference accuracy-across its 2.5V–11V operating range.
Does the MAX971CUA-T require an external reference?
No, the MAX971CUA-T includes a factory-trimmed 1.182V ±1% internal bandgap reference accessible at the REF pin. This eliminates need for external reference ICs or resistor dividers in most threshold-detection applications. The reference is referenced to V− (not GND), so proper grounding of V− is essential. Bypassing REF is not recommended, and load must stay within ±25µA source / ±15µA sink limits to maintain accuracy.
How is hysteresis implemented on the MAX971CUA-T?
Hysteresis on the MAX971CUA-T 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 0 to 100mV. For example, setting VHYST = REF − 25mV yields ~50mV hysteresis. No external op-amp or feedback loop is needed-this integrated method consumes less current and responds faster than traditional positive-feedback techniques.
Can the MAX971CUA-T operate from a 3V supply?
Yes, the MAX971CUA-T is fully specified for 3V single-supply operation (V+ = 3V, V− = GND). At 3V, supply current remains ≤4µA, propagation delay is 12µs (10mV overdrive), and input common-mode range extends from 0V to 1.7V. The internal reference maintains 1.182V ±1% accuracy, and output sink capability supports ≥1.8mA at VOL ≤ 0.4V. All electrical characteristics in the datasheet include 3V test conditions.
What is the purpose of the separate GND pin on the MAX971CUA-T?
The separate GND pin (Pin 1) on the MAX971CUA-T is the dedicated ground connection for the open-drain output transistor-not shared with analog circuitry. This isolation enables clean level translation: for example, the comparator can accept ±5V inputs (with V+ = +5V, V− = −5V) while sinking its output to a 3.3V logic domain's GND. It prevents output switching noise from coupling into reference or input stages, improving noise immunity in mixed-signal systems.
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:
- Obsolete
- 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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