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Analog Devices Inc./Maxim Integrated MAX972CUA+
- Part No.:
- MAX972CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX972CUA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
The MAX972CUA+ from Maxim Integrated is a single, ultra-low-power, open-drain comparator with no internal voltage reference and no programmable hysteresis, housed in an 8-pin µMAX package. It operates from a single 2.5V to 11V supply (or ±1.25V to ±5.5V dual supplies), draws ≤4µA quiescent current over temperature, supports rail-to-rail input common-mode range down to V− and up to V+ − 1.3V, and features an open-drain output sinking to V− - making it suitable for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the MAX972CUA+ datasheet, MAX972CUA+ pinout, MAX972CUA+ application, or MAX972CUA+ equivalent, key selection criteria include its 4µA max supply current at +70°C, absence of internal reference (requiring external biasing), lack of HYST/REF pins, 12µs propagation delay at 10mV overdrive, and compatibility with single- or dual-supply level-shifting circuits where low static power dominates design priorities.
Technical Context
The MAX972CUA+ belongs to the MAX97x/MAX98x micropower comparator family but is uniquely configured without internal reference or hysteresis circuitry - distinguishing it from MAX971/MAX981 (with 1.182V ±1%/±2% reference) and MAX973/MAX982/MAX983 (with HYST pin). Its input stage accepts voltages from V− to V+ − 1.3V, and its open-drain output sinks current to V−, not GND, eliminating the separate GND pin found in MAX971/MAX974/MAX981/MAX984.
Unlike variants with REF/HYST pins, the MAX972CUA+ requires external resistor networks for hysteresis implementation via positive feedback and external reference sources for threshold setting. Its propagation delay (12µs typical at 10mV overdrive) and input offset voltage (±10mV) are specified across 2.5V–11V supply range and −40°C to +85°C extended temperature range, though the C-temp version (0°C to +70°C) is rated per ordering code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single 2.5V to 11V or dual ±1.25V to ±5.5V - enables direct use in 3V/5V battery systems and bipolar signal conditioning without level-shifting rails. |
| Quiescent Supply Current | ≤4µA max over temperature - ensures multi-year operation on coin-cell batteries in always-on monitoring nodes. |
| Input Common-Mode Range | V− to V+ − 1.3V - supports sensing near ground or high-side signals without rail violation in single-supply configurations. |
| Propagation Delay | 12µs typical at 10mV overdrive - balances speed and power for slow-varying thresholds like battery voltage monitoring. |
| Output Type | Open-drain sinking to V− - allows wire-ORing, level translation between disparate supply domains, and interface with 1.8V–12V logic families. |
| Input Offset Voltage | ±10mV - defines minimum detectable differential for precision thresholding; stable over full operating temperature range. |
| Input Leakage Current | ±0.01nA to ±5nA - preserves accuracy in high-impedance sensor interfaces (e.g., thermistors, photodiodes) without loading errors. |
Pinout & Package
Package: 8-pin µMAX (3mm × 3mm, 0.5mm pitch), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A1) | OUTA | Open-drain comparator output; sinks current to V− - requires external pullup for logic-high assertion; supports 11V max output swing relative to V−. |
| 2 (C2) | V− | Negative supply terminal; connect to GND in single-supply mode; defines reference for input common-mode and output sink node. |
| 3 (C1) | INA+ | Noninverting input; accepts signals from V− to V+ − 1.3V - used for positive-edge threshold detection or reference comparison. |
| 4 (B1) | INA− | Inverting input; same voltage range as INA+ - forms differential pair with INA+; enables standard comparator configuration with external hysteresis. |
| 5 (B3) | NC | No connection - internally unconnected; must be left floating or tied to GND per layout best practices to avoid noise coupling. |
| 6 (C3) | NC | No connection - identical status to Pin 5; no internal bond wire; avoid routing sensitive traces nearby. |
| 7 (A2) | V+ | Positive supply terminal; supplies gate drive for output MOSFET and bias for internal circuitry; total supply ≤11V. |
| 8 (A3) | OUTB | Not applicable - MAX972 is single-comparator; this pin is NC per functional diagram and pin table; must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA max over temperature - extends battery life in IoT sensors and wearables beyond 5 years on CR2032 cells. |
| Wide supply voltage range | 2.5V to 11V single or ±1.25V to ±5.5V dual - eliminates need for LDOs in mixed-voltage systems such as industrial controllers with 3.3V logic and 10V analog rails. |
| Input common-mode range | Extends to V− and within 1.3V of V+ - enables direct sensing of ground-referenced signals or high-side current shunts without attenuators. |
| Open-drain output referenced to V− | Sinks to V−, not GND - simplifies bipolar-to-single-ended conversion when V− = −5V and V+ = +5V, yielding 0V to 10V output swing. |
| Low input leakage | ±0.01nA typical - maintains accuracy in megohm-range divider networks used for high-voltage monitoring (e.g., 48V battery packs). |
Applications
| Battery Voltage Monitor | Level Translator |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: Single comparator comparing cell voltage against fixed threshold using external resistor divider; outputs active-low alert when voltage drops below 3.0V. Use Value: 4µA supply current enables continuous monitoring without depleting primary battery; open-drain output interfaces directly with 1.8V microcontroller interrupt pin via 10kΩ pullup. |
Use Scenario: Converting ±5V op-amp output to 3.3V logic-compatible signal in data acquisition front-ends. IC Role / Device Role / Timing Role: Comparator acting as rail-to-rail input receiver with V− = −5V, V+ = +5V, and pullup to 3.3V - translating bipolar swings into unipolar logic levels. Use Value: Output sinking to V− allows safe 10V swing across output while logic side sees only 0V/3.3V; no level-shifter IC required. |
| Window Detector (Dual-Comparator Variant) | Power-Good Indicator |
|
Use Scenario: Undervoltage/overvoltage protection for FPGA core supply (1.2V ±5%). IC Role / Device Role / Timing Role: Paired MAX972CUA+ units (one for UVLO, one for OVLO) with shared reference and hysteresis resistors - each detecting opposite edge of supply window. Use Value: Independent control of upper/lower thresholds via resistor ratios; 12µs response ensures fast fault capture before system reset occurs. |
Use Scenario: Validating stable 5V rail after DC-DC converter startup in embedded gateways. IC Role / Device Role / Timing Role: Comparator comparing 5V rail to precision 4.5V reference; asserts "power-good" only when rail settles within tolerance for >10ms. Use Value: Low input offset (±10mV) ensures tight trip point accuracy; open-drain output enables wired-OR with other PG signals for system-level sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971CUA+ | Includes 1.182V ±1% internal reference and HYST pin; same 8-pin µMAX package and 4µA supply current. | Eliminates need for external reference; enables simpler hysteresis setup via two resistors - ideal for space-constrained designs with fixed thresholds. | Select MAX971CUA+ when reference stability and hysteresis simplicity outweigh cost premium over MAX972CUA+. |
| TLV3691IDCKR | Single nano-power comparator (320nA), rail-to-rail I/O, no internal reference; SOT-23-6 package; 15µs propagation delay. | Lower supply current but slower response; smaller footprint but no V−-referenced output - sinks to GND, limiting bipolar supply use cases. | Choose TLV3691IDCKR only for ultra-low-power, single-supply-only applications where 15µs delay is acceptable and V− referencing is unnecessary. |
Compared with MAX971CUA+, the MAX972CUA+ trades integrated reference and hysteresis control for lower BOM count in externally biased systems; versus TLV3691IDCKR, it offers faster response and V−-sinking output critical for dual-supply level translation - making it the optimal choice for mixed-rail industrial sensing where power and flexibility are balanced.
Availability
The MAX972CUA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and level translators requiring stable component supply across automotive infotainment, industrial handheld testers, and medical wearable platforms.
Supply support for MAX972CUA+ 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) designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on low-power innovation and ruggedized performance.
The MAX97x/MAX98x comparator family was engineered specifically for ultra-low-power, wide-supply, open-drain sensing in portable and energy-harvesting systems - prioritizing micropower operation without sacrificing input range or output flexibility.
FAQ
What is the supply current specification for MAX972CUA+ across temperature?
The MAX972CUA+ draws ≤4µA maximum supply current over the full operating temperature range of 0°C to +70°C. This value is guaranteed across all process corners and supply voltages from 2.5V to 11V, enabling predictable battery-life calculations in always-on monitoring applications. The MAX972CUA+ datasheet confirms this spec under "ELECTRICAL CHARACTERISTICS-5V OPERATION" with test conditions IN+ = IN− + 100mV.
Does MAX972CUA+ include an internal voltage reference?
No, the MAX972CUA+ does not include an internal voltage reference. Unlike MAX971CUA+ or MAX981CUA+, the MAX972CUA+ omits the REF pin and associated bandgap circuitry - requiring external reference sources (e.g., precision resistor dividers or dedicated reference ICs) for accurate threshold setting. This is confirmed in the Ordering Information table where MAX972 is listed as "None" under INTERNAL PRECISION REFERENCE.
What is the function of Pin 5 and Pin 6 on MAX972CUA+?
Pin 5 (B3) and Pin 6 (C3) on the MAX972CUA+ are no-connect (NC) terminals - internally unconnected with no bond wires. They must be left floating or tied to GND per PCB layout guidelines to minimize noise coupling. This is explicitly stated in the Pin Description table and verified in the MAX972 functional diagram (Figure 1a), which shows only Pins 1, 2, 3, 4, 7, and 8 as active.
Can MAX972CUA+ operate from dual supplies?
Yes, the MAX972CUA+ supports dual-supply operation from ±1.25V to ±5.5V. Its inputs accept common-mode voltages from V− to V+ − 1.3V, and its open-drain output sinks current to V− - enabling true bipolar-to-single-ended conversion. For example, with V+ = +5V and V− = −5V, the output can swing from −5V to +6V relative to system GND, as confirmed in the Absolute Maximum Ratings and Typical Operating Characteristics sections.
What is the propagation delay of MAX972CUA+ at 3V supply?
The MAX972CUA+ exhibits a typical propagation delay of 12µs at 10mV overdrive under 3V single-supply conditions (V+ = 3V, V− = GND). This value remains consistent across supply voltages from 2.5V to 11V per the "ELECTRICAL CHARACTERISTICS-3V OPERATION" table, where response time is specified identically to the 5V case - confirming voltage-invariant timing behavior critical for stable low-voltage design.
MAX972CUA+ 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:
- 2
- 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):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX972CUA+ FAQ
1.How can I place an order for MAX972CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX972CUA+ 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 MAX972CUA+ reliable?
The price and inventory of MAX972CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX972CUA+ is usually 5 days.
3.What payment methods are accepted for MAX972CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX972CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX972CUA+?
MAX972CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX972CUA+ 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 MAX972CUA+?
For technical support, including MAX972CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX972CUA+ requirements.
6.How does Aetrix verify that MAX972CUA+ is sourced from the original manufacturer or authorized distributors?
All MAX972CUA+ 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 MAX972CUA+ meets industry standards.
7.What is the process for return or replacement of MAX972CUA+?
All MAX972CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX972CUA+, 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 MAX972CUA+ part is unused and in its original packaging.
Return procedure for MAX972CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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