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Analog Devices Inc./Maxim Integrated MAX972CPA+
- Part No.:
- MAX972CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX972CPA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,767
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Product details
Overview
The MAX972CPA+ from Maxim Integrated is a single, ultra-low-power, open-drain comparator with no internal voltage reference and no programmable hysteresis. 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−. It is used in battery-powered threshold detection and level translation circuits where minimal power and flexible output interfacing are required.
For engineers reviewing the MAX972CPA+ datasheet, MAX972CPA+ pinout, MAX972CPA+ application, or MAX972CPA+ equivalent, key selection considerations include its lack of internal reference (requiring external reference or resistor-divider thresholds), absence of HYST pin (necessitating external hysteresis via positive feedback), 8-pin PDIP package with V−-sinking output, and guaranteed operation across 0°C to +70°C.
Technical Context
The MAX972CPA+ is a single comparator without internal reference or hysteresis circuitry - unlike MAX971/MAX982 variants - requiring external threshold generation and hysteresis implementation. Its input stage accepts voltages from V− to (V+ − 1.3V), enabling wide common-mode operation in single- or dual-supply systems.
Its open-drain output sinks current to V− (not GND), distinguishing it from MAX971/MAX974 which sink to GND. This architecture supports bipolar-to-single-ended conversion and level-shifting when V− is tied to a negative rail or ground, and enables wire-OR configurations with pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: 2.5V to 11V; Dual: ±1.25V to ±5.5V - supports direct integration into 3V/5V systems and split-rail sensor interfaces. |
| Quiescent Supply Current | ≤4µA over temperature - enables multi-year operation on coin-cell batteries in always-on monitoring applications. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - allows sensing near ground or above negative rails without clamping diodes. |
| Output Type | Open-drain N-channel MOSFET sinking to V− - permits level translation across domains and wired-OR logic with external pull-up. |
| Propagation Delay | 12µs (10mV overdrive, 100pF load, 1MΩ pull-up) - suitable for low-speed window detection and power-good signaling. |
| Input Offset Voltage | ±10mV - defines minimum detectable differential signal without calibration. |
| Input Leakage Current | ±0.01nA to ±5nA - preserves accuracy in high-impedance divider networks and capacitive sensors. |
Pinout & Package
MAX972CPA+ uses an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is top-left corner (notch side), pin 8 is top-right.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Open-drain comparator output; sinks current to V−; requires external pull-up for logic-high state. |
| 2 | V− | Negative supply rail; connect to GND for single-supply operation; output sink reference point. |
| 3 | IN+ | Noninverting input; accepts signals from V− to (V+ − 1.3V); high-impedance node. |
| 4 | IN− | Inverting input; same voltage range and impedance as IN+; forms differential sensing pair. |
| 5 | - | No connection (NC); not bonded internally; must be left floating or grounded per layout best practice. |
| 6 | - | No connection (NC); not bonded internally; must be left floating or grounded per layout best practice. |
| 7 | V+ | Positive supply rail; supplies bias for internal circuitry and output driver gate. |
| 8 | GND | Ground reference for substrate and internal logic; connects to system ground; separate from V− in dual-supply use. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | ≤4µA max over full temperature range - extends battery life in portable medical and IoT endpoint devices. |
| Wide single/dual supply support | Operates from 2.5V–11V single or ±1.25V–±5.5V dual - eliminates need for auxiliary regulators in mixed-rail systems. |
| V−-referenced open-drain output | Sinks to V−, not GND - enables true bipolar-to-single-ended conversion and rail-independent logic interfacing. |
| Rail-to-rail input capability | Inputs function down to V− and up to V+ − 1.3V - simplifies direct sensor interface without level-shifting amplifiers. |
| Low input leakage | ≤5nA over temperature - maintains accuracy in megohm-scale resistor dividers used for high-voltage monitoring. |
Applications
| Battery Voltage Monitor | Power-Good Indicator |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during discharge to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Single comparator comparing divided battery voltage against fixed reference (e.g., TLV431) to assert open-drain alert signal. Use Value: 4µA supply current enables continuous monitoring without depleting microamp-hour budgets in sleep-mode systems. | Use Scenario: Validating stable 5V/3.3V rail after power-up in embedded controllers before releasing reset. IC Role / Device Role / Timing Role: Threshold detector asserting active-low "power good" when regulated supply exceeds 4.75V. Use Value: Open-drain output allows direct wired-OR with other power monitors and compatibility with multiple logic families via pull-up selection. |
| Level Translator (±5V → 3.3V) | Window Comparator (Undervoltage + Overvoltage) |
Use Scenario: Converting analog signals from ±5V op-amp stages to 3.3V logic-compatible levels for MCU ADC inputs. IC Role / Device Role / Timing Role: Comparator with V− = −5V, V+ = +5V, and pull-up to 3.3V generating clean digital transitions. Use Value: V−-sinking output avoids level-shifter ICs or discrete transistor solutions, reducing BOM count and board area. | Use Scenario: Detecting out-of-range input voltage in industrial power supplies (e.g., 4.5V–5.5V window). IC Role / Device Role / Timing Role: Paired MAX972CPA+ units (one for low threshold, one for high) with external hysteresis resistors. Use Value: No internal reference allows independent, precision threshold setting using matched resistor networks for tight window control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971CPA+ | Includes 1.182V ±1% internal reference and HYST pin for programmable hysteresis; sinks output to GND. | Eliminates need for external reference but fixes threshold at ~1.18V; unsuitable when custom thresholds >2V or V−-referred outputs are required. | Select MAX971CPA+ only if internal reference simplifies design and GND-sinking output matches system grounding scheme. |
| LM393DR | Higher supply current (200µA typ), no internal reference, open-drain output sinking to GND, wider temp range (−40°C to +85°C). | Not optimized for micropower; better suited for cost-sensitive industrial controls than battery-critical designs. | Choose LM393DR for non-battery applications where supply current >4µA is acceptable and GND-referenced output suffices. |
Compared with MAX971CPA+, MAX972CPA+ trades internal reference and hysteresis for lower quiescent current and V−-sinking flexibility; compared with LM393DR, it delivers 50× lower supply current but narrower temperature range and less generic availability.
Availability
MAX972CPA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and level translators requiring stable component supply with long-lifecycle assurance.
Supply support for MAX972CPA+ 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 sensing and monitoring, emphasizing micropower operation, wide supply flexibility, and robust input/output interfacing for energy-constrained systems.
FAQ
Does MAX972CPA+ include an internal voltage reference?
No, MAX972CPA+ does not include an internal voltage reference. Unlike MAX971CPA+ or MAX982CPA+, it lacks both the REF and HYST pins. Thresholds must be generated externally using resistor dividers or precision references. This design choice reduces quiescent current and increases application flexibility for custom voltage windows.
What is the correct connection for the GND and V− pins on MAX972CPA+ in single-supply operation?
In single-supply operation, connect V− to system ground (same net as GND pin), and tie V+ to the positive rail (e.g., 3.3V or 5V). The GND pin serves as substrate reference and logic ground, while V− sets the output sink node - both must be at the same potential for proper operation. Do not leave V− floating.
Can MAX972CPA+ operate from a 1.8V supply?
No, MAX972CPA+ is not specified for 1.8V operation. Its absolute minimum single-supply voltage is 2.5V. Below this, performance degrades: propagation delay increases, output sink current drops, and input common-mode range shrinks. For sub-2.5V applications, consider the MAX974 series or alternative micropower comparators rated down to 1.6V.
How is hysteresis implemented on MAX972CPA+ since it lacks a HYST pin?
Hysteresis on MAX972CPA+ must be added externally using positive feedback. Connect a resistor from OUT to IN+ (noninverting input) to create regenerative feedback. The hysteresis width depends on the ratio of feedback resistor to input resistor network. This method draws more current than HYST-pin-based hysteresis and requires careful RC time constant management to avoid oscillation.
Is MAX972CPA+ pin-compatible with other MAX97x comparators in the 8-pin DIP package?
No, MAX972CPA+ is not pin-compatible with MAX971CPA+, MAX973CPA+, or MAX982CPA+ in the same 8-pin DIP package. While all share the same physical footprint, pin functions differ significantly: MAX972CPA+ has NC pins at positions 5 and 6, whereas MAX971CPA+ places REF and HYST there. Swapping them without PCB modification will cause functional failure.
MAX972CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- :
- 8-PDIP
MAX972CPA+ FAQ
1.How can I place an order for MAX972CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX972CPA+ 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 MAX972CPA+ reliable?
The price and inventory of MAX972CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX972CPA+ is usually 5 days.
3.What payment methods are accepted for MAX972CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX972CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX972CPA+?
MAX972CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX972CPA+ 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 MAX972CPA+?
For technical support, including MAX972CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX972CPA+ requirements.
6.How does Aetrix verify that MAX972CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX972CPA+ 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 MAX972CPA+ meets industry standards.
7.What is the process for return or replacement of MAX972CPA+?
All MAX972CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX972CPA+, 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 MAX972CPA+ part is unused and in its original packaging.
Return procedure for MAX972CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX972CPA+ Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
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LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP USA Inc.
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