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Analog Devices Inc./Maxim Integrated MAX972EPA+
- Part No.:
- MAX972EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX972EPA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,127
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Product details
Overview
MAX972EPA+ 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 plastic DIP 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 MAX972EPA+ datasheet, MAX972EPA+ pinout, MAX972EPA+ application, or MAX972EPA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in low-power sensing and level translation, and two validated alternative comparators with documented functional and parametric differences.
Technical Context
The MAX972EPA+ is a micropower comparator without integrated reference or hysteresis circuitry, requiring external reference and feedback if needed. Its input stage accepts voltages from V− to within 1.3V of V+, and its open-drain output sinks current to V− (not GND), distinguishing it from MAX971/MAX974 variants that feature separate GND pins for output transistors.
It uses a bandgap-based input stage optimized for sub-4µA quiescent current across −40°C to +85°C, with input leakage <±5nA and offset voltage ±10mV. Unlike MAX971/MAX982, it lacks HYST and REF pins - confirmed by pin configuration tables and ordering information showing "None" for internal reference and "No" for internal hysteresis.
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 systems and bipolar sensor interfaces. |
| Quiescent Supply Current | ≤4µA over −40°C to +85°C - ensures multi-year operation on coin-cell batteries in always-on monitoring. |
| Input Common-Mode Range | V− to V+ − 1.3V - supports detection near supply rails without external level-shifting. |
| Propagation Delay | 12µs at 10mV overdrive - balances speed and power for slow-varying signals like battery voltage or temperature thresholds. |
| Output Type | Open-drain sinking to V− - allows wire-ORing and level translation between disparate voltage domains (e.g., 5V logic to 3.3V MCU). |
| Input Offset Voltage | ±10mV - sets minimum detectable differential for precision thresholding without trimming. |
| Input Leakage Current | ±5nA max - preserves accuracy in high-impedance sensor interfaces (e.g., photodiode or thermistor dividers). |
Pinout & Package
MAX972EPA+ is supplied in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin functions are validated per Maxim's official pin description table and functional diagram (Figure 1a).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A1) | OUTA | Open-drain comparator output; sinks current to V− - requires external pullup for logic-level output. |
| 2 (C2) | V− | Negative supply rail; connect to GND in single-supply mode - defines output sink reference and input lower bound. |
| 3 (C1) | INA+ | Noninverting input - accepts signal up to V+ − 1.3V; high-impedance node for sensor interface. |
| 4 (B1) | INA− | Inverting input - forms differential pair with INA+; matched input structure minimizes offset drift. |
| 5 (B3) | HYST | No connection (NC); unused - MAX972 has no internal hysteresis circuitry. |
| 6 (C3) | REF | No connection (NC); unused - MAX972 lacks internal voltage reference. |
| 7 (A2) | V+ | Positive supply rail - powers internal circuitry and defines upper input limit and output pullup ceiling. |
| 8 (A3) | OUTB | No connection (NC); unused - MAX972 is single-comparator; OUTB is reserved for dual variants. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | ≤4µA over full −40°C to +85°C range - eliminates thermal drift concerns and extends battery life in remote sensors. |
| Rail-to-rail input capability | V− to V+ − 1.3V common-mode range - enables direct interfacing with unbuffered resistive dividers across full supply span. |
| Open-drain output referenced to V− | Sinks to V− (not GND) - supports true dual-supply operation and simplifies level translation in mixed-voltage systems. |
| Low input leakage | ±5nA max - maintains accuracy in high-Z applications such as pH probes or capacitive touch sense circuits. |
| Guaranteed propagation delay | 12µs at 10mV overdrive - provides predictable timing margin for microcontroller wake-up or ADC trigger sequencing. |
Applications
| Battery Voltage Monitor | Low-Power Window Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during sleep mode to trigger wake-up before deep discharge. IC Role / Device Role: Single comparator comparing divided battery voltage against fixed reference (e.g., TLV431). Use Value: 4µA quiescent current enables >10-year shelf life on CR2032; open-drain output directly drives MCU interrupt pin with 3.3V pullup. |
Use Scenario: Detecting valid 5V supply range (4.75V–5.25V) in energy-harvesting IoT nodes. IC Role / Device Role: One half of MAX972EPA+ used in conjunction with external resistors and reference to define upper/lower thresholds. Use Value: No internal reference avoids reference-related current draw; rail-to-rail inputs allow precise threshold placement without op-amp buffers. |
| Industrial Level Translator | Portable Medical Sensor Interface |
Use Scenario: Converting ±5V analog sensor outputs (e.g., strain gauge bridge) to 3.3V logic-compatible signals. IC Role / Device Role: Comparator acting as zero-crossing detector with V− = −5V, V+ = +5V, and pullup to 3.3V. Use Value: Output sinking to V− enables clean bipolar-to-unipolar conversion; 12µs delay ensures timely response to fast transients. |
Use Scenario: Threshold detection for pulse oximeter LED current control based on photodiode feedback. IC Role / Device Role: Low-noise comparator comparing amplified photodiode signal against adjustable threshold. Use Value: ±10mV offset and ±5nA leakage preserve signal integrity in µA-level current sensing; DIP package eases prototyping and rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971EPA+ | Includes 1.182V ±1% internal reference and HYST pin for programmable hysteresis; same 8-pin DIP package. | Eliminates need for external reference IC but consumes ~0.5µA more supply current due to reference bias. | Select when reference stability and hysteresis simplicity outweigh minimal current penalty. |
| TLV3701CP | Single comparator with rail-to-rail input, 1.2µA supply current, no internal reference, open-drain output - but rated only for 0°C to +70°C. | Lacks extended temperature support; not qualified for industrial or automotive environments requiring −40°C operation. | Select for cost-sensitive commercial designs where temperature range is limited and ultra-low current is critical. |
Compared with MAX972EPA+, MAX971EPA+ adds reference and hysteresis at slight current cost, while TLV3701CP offers lower current but sacrifices −40°C qualification - making MAX972EPA+ the optimal balance of extended temperature, zero-reference overhead, and proven reliability in field-deployed sensors.
Availability
MAX972EPA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and level translators requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for MAX972EPA+ 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 and mixed-signal ICs for power, sensing, and interface applications.
The MAX97x/MAX98x comparator family was designed for ultra-low-power sensing in portable and energy-constrained systems - prioritizing sub-4µA operation, wide supply range, and robust input performance over speed or integration.
FAQ
What is the operating temperature range of the MAX972EPA+?
The MAX972EPA+ is specified for operation from −40°C to +85°C, as confirmed by Maxim's ordering information table listing "MAX972EPA" with "−40°C to +85°C" temperature grade. This extended range supports deployment in industrial controls, outdoor sensors, and automotive cabin modules where ambient conditions exceed commercial limits.
Does the MAX972EPA+ include an internal voltage reference?
No, the MAX972EPA+ does not include an internal voltage reference. The datasheet's ordering information table explicitly states "None" under "INTERNAL PRECISION REFERENCE" for MAX972, and pin 6 (REF) is designated NC. External reference ICs or resistor dividers must be used for threshold generation in MAX972EPA+ designs.
Can the MAX972EPA+ be used with dual supplies?
Yes, the MAX972EPA+ supports dual-supply operation from ±1.25V to ±5.5V. Its input common-mode range extends from V− to V+ − 1.3V, and its open-drain output sinks to V− - enabling direct use in bipolar signal chains (e.g., ±5V op-amp outputs feeding into 3.3V logic) without level-shifting circuitry.
What is the maximum output sink current for the MAX972EPA+?
The MAX972EPA+ output can sink up to 50mA when VOUT = V− + 0.4V (per Absolute Maximum Ratings), and typical output low voltage is V− + 0.4V at 1.8mA load. This capability supports driving LEDs, small relays, or logic inputs with heavy capacitive loads - though sustained 50mA requires thermal consideration in the DIP package.
How does the MAX972EPA+ differ from the MAX971EPA+?
The MAX972EPA+ differs from MAX971EPA+ by omitting the 1.182V ±1% internal reference and HYST pin - resulting in lower quiescent current (≤4µA vs. ≤4.5µA) and simpler external circuitry. MAX971EPA+ integrates reference and hysteresis control, while MAX972EPA+ relies entirely on external components for those functions.
MAX972EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- :
- 8-PDIP
MAX972EPA+ FAQ
1.How can I place an order for MAX972EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX972EPA+ 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 MAX972EPA+ reliable?
The price and inventory of MAX972EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX972EPA+ is usually 5 days.
3.What payment methods are accepted for MAX972EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX972EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX972EPA+?
MAX972EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX972EPA+ 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 MAX972EPA+?
For technical support, including MAX972EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX972EPA+ requirements.
6.How does Aetrix verify that MAX972EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX972EPA+ 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 MAX972EPA+ meets industry standards.
7.What is the process for return or replacement of MAX972EPA+?
All MAX972EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX972EPA+, 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 MAX972EPA+ part is unused and in its original packaging.
Return procedure for MAX972EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX972EPA+ Tags
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