My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX971CPA+
- Part No.:
- MAX971CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
MAX971CPA+.pdf
- Description:
- IC COMPARATOR OD 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,547
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX971CPA+ from Maxim Integrated is a single-channel, ultra-low-power comparator with integrated 1.182V ±1% precision voltage reference, open-drain output, and programmable hysteresis via HYST pin. It operates from 2.5V to 11V single supply (or ±1.25V to ±5.5V dual supply), draws ≤4µA quiescent current over temperature, supports rail-to-rail input range down to V− and up to V+ − 1.3V, and is used in battery-powered threshold detection and level translation circuits.
For engineers reviewing the MAX971CPA+ datasheet, MAX971CPA+ pinout, MAX971CPA+ application, or MAX971CPA+ equivalent, key selection considerations include its 4µA max supply current, 1.182V ±1% internal reference, 12µs propagation delay at 10mV overdrive, open-drain output with separate GND pin for bipolar-to-single-ended conversion, and compatibility with 0°C to +70°C commercial temperature range in 8-pin PDIP package.
Technical Context
The MAX971CPA+ integrates a micropower bandgap reference and a single comparator with hysteresis control architecture. Its HYST pin enables simple resistor-based hysteresis programming without external feedback, delivering a configurable hysteresis band up to 100mV by adjusting REF–HYST voltage difference.
It features an open-drain output stage with dedicated GND terminal (Pin 1), enabling true level-shifting operation - the output can sink to GND even when V− is connected to a negative rail or floating node. Input common-mode range extends from V− to V+ − 1.3V, supporting robust operation in single- and dual-supply configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | ≤4µA max over 0°C to +70°C - enables multi-year battery life in always-on sensor nodes. |
| Reference Voltage | 1.182V ±1% (0°C to +70°C) - provides stable, factory-trimmed threshold for precision comparators without external components. |
| Propagation Delay | 12µs typical at 10mV overdrive - balances speed and ultra-low power for wake-up and alert applications. |
| Input Voltage Range | V− to V+ − 1.3V - supports wide dynamic range sensing, including near-rail inputs in 3V/5V systems. |
| Output Configuration | Open-drain with separate GND pin (Pin 1) - allows direct interfacing to higher-voltage logic or bipolar supplies without level-shifters. |
| Operating Supply | Single 2.5V to 11V or dual ±1.25V to ±5.5V - accommodates legacy industrial rails and modern low-voltage portable designs. |
| Package | 8-pin plastic DIP (PDIP) - through-hole mounting suitable for prototyping, test fixtures, and ruggedized industrial PCBs. |
Pinout & Package
MAX971CPA+ uses an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard through-hole footprint. Pin 1 is GND, Pin 2 is V−, Pin 3 is IN+, Pin 4 is IN−, Pin 5 is HYST, Pin 6 is REF, Pin 7 is V+, and Pin 8 is OUT.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for output transistor - must be tied to system ground for proper open-drain sinking to 0V. |
| 2 | V− | Negative supply rail - connect to GND for single-supply operation; enables dual-supply use when biased negative. |
| 3 | IN+ | Noninverting comparator input - accepts signals from V− to V+ − 1.3V; high-impedance (±0.01nA leakage). |
| 4 | IN− | Inverting comparator input - matched offset and leakage to IN+; supports differential or single-ended thresholds. |
| 5 | HYST | Hysteresis control input - voltage between REF and HYST sets hysteresis band (max 100mV); connect to REF if unused. |
| 6 | REF | 1.182V ±1% reference output - referenced to V−, not GND; sources/sinks up to 25µA/15µA; no bypassing required. |
| 7 | V+ | Positive supply rail - powers internal circuitry and defines upper limit of input/output voltage ranges. |
| 8 | OUT | Open-drain comparator output - sinks current to Pin 1 (GND); requires external pullup for logic-level output. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA over full commercial temperature range - eliminates need for enable/disable sequencing in energy-constrained systems. |
| Integrated ±1% voltage reference | 1.182V trimmed bandgap reference referenced to V− - removes external reference IC and associated BOM cost/area. |
| Programmable hysteresis | Simple two-resistor network on HYST pin - avoids complex positive-feedback design and reduces layout sensitivity. |
| Separate GND for output stage | Dedicated Pin 1 GND - enables reliable level translation between bipolar and single-ended domains without signal inversion. |
| Wide supply voltage range | 2.5V to 11V single or ±1.25V to ±5.5V dual - supports mixed-voltage systems and legacy industrial rails. |
Applications
| Battery-Powered Threshold Detector | Level Translator (Bipolar to Single-Ended) |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during sleep mode to trigger wake-up at 3.0V under-voltage threshold. IC Role / Device Role / Timing Role: Single comparator compares battery voltage against internal 1.182V reference scaled by resistor divider; HYST pin adds 20mV hysteresis to prevent chatter. Use Value: 4µA supply current extends shelf life beyond 10 years; open-drain output interfaces directly to microcontroller's interrupt pin with 3.3V pullup. |
Use Scenario: Converting ±5V analog sensor output to 3.3V logic-compatible signal for MCU ADC input. IC Role / Device Role / Timing Role: Comparator compares bipolar input against 0V (via REF–1.182V offset), with output sinking to GND (Pin 1) regardless of V− connection. Use Value: Eliminates discrete level-shifter IC; separate GND pin ensures clean 0V-referenced output even when V− = –5V. |
| Window Comparator (Undervoltage/Overvoltage) | Oscillator Circuit (Relaxation Oscillator) |
|
Use Scenario: Validating 5V system rail integrity with 4.5V undervoltage and 5.5V overvoltage thresholds. IC Role / Device Role / Timing Role: Two MAX971CPA+ units configured as high- and low-threshold detectors; outputs wire-ORed to generate active-high POWER_GOOD signal. Use Value: Internal reference and hysteresis eliminate four external precision references and feedback resistors; total solution current < 8µA. |
Use Scenario: Generating 1Hz timing signal for periodic sensor sampling in environmental monitor. IC Role / Device Role / Timing Role: Comparator drives RC network with hysteresis; output toggles as capacitor charges/discharges between thresholds set by REF and HYST. Use Value: No external reference needed - 1.182V reference and programmable hysteresis define precise oscillation frequency; 4µA current minimizes timing drift vs. supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921CPA+ | Same 8-pin PDIP package; includes 1.182V ±1% reference but lacks HYST pin and programmable hysteresis. | Requires external positive-feedback network for hysteresis; less suitable for precision window detection. | Select when hysteresis is unnecessary or implemented externally; identical supply current and reference accuracy. |
| TLV3701CP | Single comparator in 8-pin PDIP; no internal reference; rail-to-rail input; 1.8µA supply current; 360µs response time. | Cannot replace MAX971CPA+ in reference-dependent circuits; requires external reference and hysteresis components. | Choose for ultra-low-power applications where external reference is already present and speed is non-critical. |
Compared with MAX921CPA+ and TLV3701CP, the MAX971CPA+ uniquely combines ultra-low supply current, integrated ±1% reference, and pin-controlled hysteresis in one PDIP package - making it optimal for self-contained, battery-operated threshold detection where BOM count and board space are constrained.
Availability
MAX971CPA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, level translators, and oscillator circuits requiring stable component supply across commercial temperature range and long-term production continuity.
Supply support for MAX971CPA+ 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, interface, and timing applications.
The MAX971CPA+ belongs to the MAX97x/MAX98x micropower comparator family, engineered specifically for ultra-low-power threshold detection and reference-stable signal conditioning in portable and energy-harvesting systems.
FAQ
What is the maximum supply voltage for MAX971CPA+?
The MAX971CPA+ supports a single-supply voltage range of 2.5V to 11V, or dual supplies from ±1.25V to ±5.5V. Absolute maximum ratings allow V+ to V− up to 12V, but functional operation is guaranteed only within the specified 2.5V–11V range. Exceeding 11V may damage the MAX971CPA+ or degrade long-term reliability.
Does MAX971CPA+ require an external reference?
No, the MAX971CPA+ includes an internal 1.182V ±1% precision bandgap reference accessible at Pin 6 (REF). This reference is referenced to V−, not GND, and is fully characterized over temperature. External reference components are unnecessary unless tighter tolerance or different voltage is required.
How is hysteresis implemented on MAX971CPA+?
Hysteresis on the MAX971CPA+ is implemented using the HYST pin (Pin 5). Connect a resistor R1 between REF (Pin 6) and HYST, and R2 between HYST and V− (Pin 2). The hysteresis band equals approximately twice the voltage difference between REF and HYST, with a maximum of 100mV. If unused, tie HYST directly to REF.
What is the purpose of the separate GND pin (Pin 1) on MAX971CPA+?
Pin 1 (GND) is the dedicated ground terminal for the open-drain output transistor. It allows the output to sink cleanly to 0V even when V− (Pin 2) is connected to a negative rail or floating node - enabling reliable bipolar-to-single-ended level translation without additional components. Do not tie Pin 1 and Pin 2 together unless operating strictly in single-supply mode.
Can MAX971CPA+ operate from a 3V supply?
Yes, the MAX971CPA+ is fully specified and functional at 3V single supply (V+ = 3V, V− = GND). Electrical characteristics including supply current (≤3.8µA typ), propagation delay (12µs), and reference accuracy (±1%) are guaranteed across 2.5V–11V, making it ideal for 3V battery-powered applications such as IoT sensors and wearables.
MAX971CPA+ 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:
- -
- :
- -
MAX971CPA+ FAQ
1.How can I place an order for MAX971CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX971CPA+ 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 MAX971CPA+ reliable?
The price and inventory of MAX971CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX971CPA+ is usually 5 days.
3.What payment methods are accepted for MAX971CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX971CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX971CPA+?
MAX971CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX971CPA+ 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 MAX971CPA+?
For technical support, including MAX971CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX971CPA+ requirements.
6.How does Aetrix verify that MAX971CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX971CPA+ 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 MAX971CPA+ meets industry standards.
7.What is the process for return or replacement of MAX971CPA+?
All MAX971CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX971CPA+, 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 MAX971CPA+ part is unused and in its original packaging.
Return procedure for MAX971CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX971CPA+ Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
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.
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
