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Analog Devices Inc./Maxim Integrated MAX972ESA+
- Part No.:
- MAX972ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX972ESA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,545
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Product details
Overview
The MAX972ESA+ 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 SO package. It operates from a single 2.5V to 11V supply (or ±1.25V to ±5.5V dual supplies), draws ≤4µA supply current over temperature, supports rail-to-rail input common-mode range (V− to V+ − 1.3V), and features 12µs propagation delay at 10mV overdrive - ideal for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the MAX972ESA+ datasheet, MAX972ESA+ pinout, MAX972ESA+ application, or MAX972ESA+ equivalent, key selection considerations include its reference-free architecture, absence of HYST/REF pins, 8-pin SO footprint compatibility with MAX971/MAX981 variants, and suitability for low-noise, low-quiescent-current level translation where external reference control is preferred.
Technical Context
The MAX972ESA+ belongs to Maxim's micropower comparator family optimized for single- or dual-supply operation without internal reference dependency. Its input stage accepts voltages from V− to (V+ − 1.3V), enabling direct sensing near supply rails, and its open-drain output sinks current to V− (not GND), supporting bipolar-to-single-ended conversion when V− ≠ GND.
Unlike MAX971/MAX981 variants, the MAX972ESA+ omits both the 1.182V bandgap reference and HYST pin, requiring external reference and hysteresis implementation via positive feedback. Its propagation delay (12µs at 10mV overdrive) and 20µVRMS input voltage noise are specified across −40°C to +85°C, with guaranteed performance down to 2.5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single 2.5V to 11V or dual ±1.25V to ±5.5V - enables operation from coin-cell batteries or split-rail industrial supplies. |
| Quiescent Supply Current | ≤4µA over −40°C to +85°C - ensures multi-year battery life in always-on sensor nodes. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - allows direct interface with signals referenced to V−, including ground-referenced sensors in dual-supply systems. |
| Propagation Delay | 12µs at 10mV overdrive - supports sub-10kHz event detection with predictable timing margins. |
| Output Type | Open-drain sinking to V− - permits wire-ORing, level shifting up to 11V above V−, and compatibility with mixed-voltage logic domains. |
| Input Offset Voltage | ±10mV - sets minimum detectable differential signal without calibration. |
| Voltage Noise (100Hz–100kHz) | 20µVRMS - defines resolution limit for low-amplitude analog thresholding applications. |
Pinout & Package
Package: 8-pin SO (Small Outline Integrated Circuit), 150-mil width, RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Comparator A Open-Drain Output | Sinks current to V−; requires external pullup for logic-level output; supports 11V max output swing above V−. |
| 2 (V−) | Negative Supply | Reference node for inputs and output sink; connect to GND for single-supply use; defines REF-less operation baseline. |
| 3 (INA+) | Noninverting Input of Comparator A | Accepts signals from V− to (V+ − 1.3V); high-impedance (±0.01nA leakage) minimizes loading on source. |
| 4 (INA−) | Inverting Input of Comparator A | Matches INA+ specs; differential input pair enables precision threshold comparison against external reference. |
| 5 (NC) | No Connect | Not bonded internally; must remain unconnected per datasheet - no tie-to-ground or routing allowed. |
| 6 (NC) | No Connect | Not bonded internally; floating per design; PCB layout must isolate from traces and planes. |
| 7 (V+) | Positive Supply | Primary power rail; supplies gate drive for output MOSFET; determines output sink strength and propagation delay. |
| 8 (GND) | Ground | System reference for PCB return paths; electrically isolated from V− in dual-supply configurations. |
Key Features
| Feature | Design Value |
|---|---|
| No internal voltage reference | Enables full design flexibility with user-selected reference ICs or resistor dividers, avoiding ±1% or ±2% reference tolerance constraints. |
| No HYST pin | Requires external hysteresis via positive feedback, eliminating internal reference coupling noise and allowing custom hysteresis band tuning. |
| Output sinks to V− | Supports true bipolar supply operation (e.g., ±5V) without level-shifting circuitry; output remains functional even when V+ = V− = 0V. |
| Guaranteed operation down to 2.5V | Validates use in Li-ion (3.0–4.2V) and 3.3V systems without derating; performance degrades below 2.5V but comparators remain active. |
| Ultra-low input bias current | ±0.01nA max at −40°C to +85°C - preserves accuracy in high-impedance sensor interfaces (e.g., thermistors, photodiodes). |
Applications
| Battery Voltage Monitor | Low-Power Window Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles in wearables or IoT edge nodes. IC Role / Device Role / Timing Role: Single comparator comparing sensed cell voltage against externally generated upper/lower thresholds. Use Value: 4µA quiescent current extends battery runtime by >30% versus standard comparators; open-drain output interfaces directly with microcontroller GPIO interrupt pins. |
Use Scenario: Detecting valid operating voltage range (e.g., 3.0V–3.6V) for MCU reset control in energy-harvesting systems. IC Role / Device Role / Timing Role: Core element in discrete window detector built with two MAX972ESA+ units and external resistive dividers. Use Value: Absence of internal reference eliminates drift-induced false triggers; rail-to-rail input enables full utilization of supply headroom for tight threshold margins. |
| Level Translator (±5V → 3.3V) | Power-Good Signal Generator |
Use Scenario: Converting legacy ±5V analog sensor outputs to 3.3V logic-compatible signals in industrial PLC modules. IC Role / Device Role / Timing Role: Threshold comparator translating bipolar input swings into unidirectional logic-level assertions. Use Value: V−-referenced output sink allows direct connection to 3.3V pullup; 12µs delay ensures deterministic timing for synchronous sampling. |
Use Scenario: Generating system-ready flag after DC-DC converter output stabilizes within ±2% of nominal 5V rail. IC Role / Device Role / Timing Role: One half of dual-comparator window detector asserting "power good" only when voltage stays between 4.9V and 5.1V. Use Value: External hysteresis implementation prevents chatter during slow-ramping supplies; SO package simplifies rework in high-density layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971ESA+ | Includes 1.182V ±1% internal reference and HYST pin; same 8-pin SO package and pinout. | Reduces BOM count in reference-dependent designs but adds ±1% reference drift and potential noise coupling. | Select MAX971ESA+ when internal reference simplifies layout and ±1% accuracy suffices; avoid if reference noise or drift compromises measurement integrity. |
| MAX982ESA+ | Includes 1.182V ±2% internal reference and HYST pin; identical supply/current/noise specs and 8-pin SO footprint. | Offers lower-cost reference solution where ±2% tolerance is acceptable, e.g., non-critical overvoltage alerts. | Choose MAX982ESA+ for cost-sensitive applications needing integrated hysteresis and reference; verify reference noise impact on low-level signal detection. |
Compared with MAX972ESA+, MAX971ESA+ and MAX982ESA+ integrate reference and hysteresis functions at the cost of added noise sensitivity and fixed tolerance - making MAX972ESA+ preferable for high-precision, externally controlled thresholding where design flexibility and minimal interference outweigh integration convenience.
Availability
MAX972ESA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, level translators, and oscillator circuits requiring stable component supply across industrial temperature ranges.
Supply support for MAX972ESA+ 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 interface applications in industrial, medical, and communications markets.
The MAX97x/MAX98x comparator family targets ultra-low-power, rail-to-rail sensing in space- and energy-constrained systems, emphasizing quiescent current optimization and flexible supply architecture over integrated reference convenience.
FAQ
What is the maximum supply voltage rating for the MAX972ESA+?
The MAX972ESA+ has an absolute maximum supply voltage of 12V total (V+ to V−), with recommended operating range of 2.5V to 11V for single-supply use. Dual-supply operation supports ±1.25V to ±5.5V, maintaining full functionality across this range. Exceeding 12V risks permanent damage per Absolute Maximum Ratings.
Does the MAX972ESA+ include an internal voltage reference?
No, the MAX972ESA+ does not include an internal voltage reference. Unlike MAX971ESA+ or MAX982ESA+, it lacks REF and HYST pins entirely. Reference voltage must be supplied externally - enabling custom accuracy, temperature stability, and noise performance independent of the comparator's internal circuitry.
What is the purpose of the NC pins (pins 5 and 6) on the MAX972ESA+?
Pins 5 and 6 on the MAX972ESA+ are No Connect (NC) terminals - they are not bonded to the die and serve no electrical function. These pins must remain unconnected in PCB layout; routing traces to them or tying them to ground/V+ violates the datasheet and may cause unpredictable behavior or reliability issues.
Can the MAX972ESA+ operate from a 3.3V single supply?
Yes, the MAX972ESA+ is fully specified for 3.3V single-supply operation (V+ = 3.3V, V− = GND). Electrical characteristics including 4µA supply current, 12µs propagation delay, and ±10mV input offset are guaranteed across −40°C to +85°C at 3.3V, making it suitable for modern low-voltage embedded systems.
How does the output stage of the MAX972ESA+ differ from that of the MAX971ESA+?
The MAX972ESA+ output sinks current to V−, whereas the MAX971ESA+ output sinks to GND. This difference enables MAX972ESA+ to operate correctly in true dual-supply configurations (e.g., V+ = +5V, V− = −5V) without requiring level-shifting components, while MAX971ESA+ is optimized for single-supply systems where GND serves as the output return path.
MAX972ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX972ESA+ FAQ
1.How can I place an order for MAX972ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX972ESA+ 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 MAX972ESA+ reliable?
The price and inventory of MAX972ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX972ESA+ is usually 5 days.
3.What payment methods are accepted for MAX972ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX972ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX972ESA+?
MAX972ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX972ESA+ 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 MAX972ESA+?
For technical support, including MAX972ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX972ESA+ requirements.
6.How does Aetrix verify that MAX972ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX972ESA+ 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 MAX972ESA+ meets industry standards.
7.What is the process for return or replacement of MAX972ESA+?
All MAX972ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX972ESA+, 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 MAX972ESA+ part is unused and in its original packaging.
Return procedure for MAX972ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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