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Analog Devices Inc./Maxim Integrated MAX971EPA+
- Part No.:
- MAX971EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX971EPA+.pdf
- Description:
- IC COMPARATOR OD 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,143
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Product details
Overview
The MAX971EPA+ from Maxim Integrated is a single, ultra-low-power, open-drain comparator with internal 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 supply current over temperature, and supports rail-to-rail input voltage range down to V− and up to V+ − 1.3V - ideal for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the MAX971EPA+ datasheet, MAX971EPA+ pinout, MAX971EPA+ application, or MAX971EPA+ equivalent, key selection criteria include its guaranteed −40°C to +85°C extended temperature operation, separate GND pin enabling bipolar-to-single-ended level translation, and hysteresis implementation without external feedback resistors.
Technical Context
The MAX971EPA+ integrates a precision bandgap reference (1.182V ±1% over −40°C to +85°C) and a single comparator with open-drain output sinking to GND. Its HYST pin allows simple resistor-based hysteresis programming (REF to HYST voltage difference sets hysteresis band), eliminating need for external positive feedback networks.
Input common-mode range extends from V− to V+ − 1.3V; output can swing up to 11V above V− and remains functional even with no supply applied (V+ = V−). Propagation delay is 12µs at 10mV overdrive with 100pF load and 1MΩ pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 11V single supply; enables use in 3V/5V systems and wide-input industrial rails |
| Quiescent Current | ≤4µA over −40°C to +85°C; supports multi-year battery life in always-on sensing nodes |
| Reference Accuracy | ±1% over −40°C to +85°C; eliminates need for external precision reference in voltage monitoring |
| Input Common-Mode Range | V− to V+ − 1.3V; allows direct sensing of signals near supply rails without attenuation |
| Propagation Delay | 12µs (10mV overdrive); sufficient for slow-varying thresholds like power-good or battery low detection |
| Output Configuration | Open-drain with separate GND pin; supports wire-OR logic and level translation between disparate voltage domains |
| Hysteresis Control | HYST pin accepts REF − 50mV to REF; enables 0–100mV adjustable hysteresis band without feedback components |
Pinout & Package
MAX971EPA+ uses an 8-pin plastic DIP package (0.300" width) with through-hole mounting. Pin 1 is OUT, Pin 2 is V−, Pin 3 is IN+, Pin 4 is IN−, Pin 5 is HYST, Pin 6 is REF, Pin 7 is V+, Pin 8 is GND.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Open-drain comparator output sinking to GND; requires external pullup for logic-high assertion |
| 2 | V− | Negative supply rail; connect to GND for single-supply operation |
| 3 | IN+ | Noninverting input; accepts signals from V− to V+ − 1.3V |
| 4 | IN− | Inverting input; same common-mode range as IN+ |
| 5 | HYST | Hysteresis control input; sets threshold offset by voltage difference from REF |
| 6 | REF | 1.182V ±1% reference output referenced to V−; sources/sinks up to 25µA/15µA |
| 7 | V+ | Positive supply rail; supplies gate drive for output MOSFET |
| 8 | GND | Output-stage ground; isolated from V− to enable bipolar-to-single-ended conversion |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | ≤4µA over full −40°C to +85°C range ensures minimal battery drain in portable devices |
| Integrated ±1% reference | Eliminates external reference IC and associated layout area, BOM cost, and calibration effort |
| HYST pin hysteresis | Enables precise, resistor-programmable hysteresis without feedback network design or stability analysis |
| Separate GND pin | Allows output to sink to system GND while inputs operate from V−, enabling true level-shifting capability |
| Wide supply range | 2.5V–11V single supply or ±1.25V–±5.5V dual supply supports legacy and modern mixed-voltage systems |
Applications
| Battery Voltage Monitor | Power-Good Detector |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during discharge to trigger low-battery alert before cutoff. IC Role / Device Role / Timing Role: Single comparator compares cell voltage against 1.182V reference scaled by resistor divider; HYST pin adds 20mV hysteresis to prevent chatter near threshold. Use Value: Enables accurate, low-power undervoltage lockout without external reference or hysteresis components. | Use Scenario: Validating stable 5V rail after power-up in microcontroller-based embedded systems. IC Role / Device Role / Timing Role: Comparator asserts open-drain output low when 5V rail drops below 4.75V; pulled up to 3.3V logic domain. Use Value: Provides clean, noise-immune power-good signal with built-in reference and hysteresis - no external parts needed. |
| Window Comparator | Level Translator |
Use Scenario: Detecting if a sensor output stays within safe operating bounds (e.g., 3.0V–3.6V). IC Role / Device Role / Timing Role: Two MAX971EPA+ units configured as high- and low-threshold detectors; outputs wire-ORed to generate fault flag. Use Value: Achieves precise window detection using only one reference per device and shared HYST programming. | Use Scenario: Converting ±5V analog signals from legacy test equipment to 0–3.3V logic-compatible levels. IC Role / Device Role / Timing Role: Comparator compares input against 0V (GND) with V− = −5V and V+ = +5V; output sinks to GND when input > 0V. Use Value: Leverages separate GND pin to translate bipolar inputs to unipolar logic outputs without level-shifting ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX971CPA+ | Same electrical specs but rated for 0°C to +70°C commercial temperature range | Not suitable for automotive or industrial environments requiring −40°C operation | Select MAX971CPA+ only for cost-sensitive consumer applications with controlled ambient temperatures |
| TLV3701IDBVR | Lower quiescent current (1.6µA), no internal reference, rail-to-rail input, SC70-5 package | Requires external reference and hysteresis circuitry; better for ultra-low-power designs where board space is critical | Choose TLV3701IDBVR when minimizing supply current is paramount and reference/hysteresis can be added externally |
Compared with MAX971CPA+, the MAX971EPA+ provides extended temperature reliability without trade-offs in power or accuracy; compared with TLV3701IDBVR, it trades 2.4µA higher quiescent current for integrated reference and simplified hysteresis - reducing component count and validation effort.
Availability
MAX971EPA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and level translators requiring stable component supply across industrial temperature ranges.
Supply support for MAX971EPA+ 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.
The MAX971EPA+ belongs to the MAX97x/MAX98x micropower comparator family, engineered specifically for ultra-low-power, single-supply sensing and monitoring in portable and energy-constrained systems.
FAQ
What is the operating temperature range of the MAX971EPA+?
The MAX971EPA+ is specified for −40°C to +85°C extended temperature operation. This rating is confirmed in the Ordering Information table and Electrical Characteristics sections of the datasheet, making it suitable for industrial and automotive under-hood applications where thermal robustness is required. The MAX971EPA+ maintains ≤4µA supply current and ±1% reference accuracy across this full range.
Does the MAX971EPA+ require an external reference?
No, the MAX971EPA+ includes an internal 1.182V ±1% bandgap voltage reference output on Pin 6 (REF). This reference is referenced to V−, not GND, and is capable of sourcing up to 25µA and sinking up to 15µA. External bypassing is not recommended, and no external reference is needed for standard threshold detection applications.
How is hysteresis implemented on the MAX971EPA+?
Hysteresis on the MAX971EPA+ is implemented via the HYST pin (Pin 5), which accepts a voltage from REF − 50mV to REF. Connecting two resistors between REF, HYST, and V− sets the hysteresis band - approximately twice the REF-to-HYST voltage difference. This method avoids external feedback loops and delivers faster, lower-current hysteresis than conventional resistor-based approaches.
What is the purpose of the separate GND pin on the MAX971EPA+?
The separate GND pin (Pin 8) on the MAX971EPA+ isolates the output-stage ground from the signal ground (V−). This allows the open-drain output to sink to system GND while the comparator inputs operate from a negative supply rail (e.g., V− = −5V), enabling true bipolar-to-single-ended level translation - a key feature for interfacing legacy ±5V circuits with modern 3.3V logic.
Can the MAX971EPA+ operate from a 2.5V supply?
Yes, the MAX971EPA+ is fully specified to operate from a minimum single-supply voltage of 2.5V. At 2.5V, it maintains guaranteed performance including ≤4µA supply current, functional reference output, and valid propagation delay. Operation below 2.5V is possible but degrades reference accuracy and output sink capability - not recommended for production designs.
MAX971EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
MAX971EPA+ FAQ
1.How can I place an order for MAX971EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX971EPA+ 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 MAX971EPA+ reliable?
The price and inventory of MAX971EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX971EPA+ is usually 5 days.
3.What payment methods are accepted for MAX971EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX971EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX971EPA+?
MAX971EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX971EPA+ 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 MAX971EPA+?
For technical support, including MAX971EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX971EPA+ requirements.
6.How does Aetrix verify that MAX971EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX971EPA+ 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 MAX971EPA+ meets industry standards.
7.What is the process for return or replacement of MAX971EPA+?
All MAX971EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX971EPA+, 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 MAX971EPA+ part is unused and in its original packaging.
Return procedure for MAX971EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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