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Analog Devices Inc./Maxim Integrated MAX971CSA
- Part No.:
- MAX971CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX971CSA.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,611
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Product details
Overview
The MAX971CSA from Maxim Integrated is a single, ultra-low-power, open-drain comparator with integrated 1.182V ±1% precision voltage reference 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 within 1.3V of V+, and is widely used in battery-powered threshold detection and level translation.
For engineers reviewing the MAX971CSA datasheet, MAX971CSA pinout, MAX971CSA application, or MAX971CSA equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the SO-8 packaged device.
Technical Context
The MAX971CSA integrates a micropower bandgap reference (1.182V ±1%, 0°C to +70°C) and a single comparator with open-drain output sinking to GND. Its HYST pin enables simple resistor-based hysteresis programming without external feedback, delivering deterministic threshold bands up to 100mV.
Input common-mode range spans V− to (V+ − 1.3V); output voltage swing reaches up to 11V above V−, independent of V+ presence. Propagation delay is 12µs (10mV overdrive, 100pF load, 1MΩ pullup), and output low voltage is ≤0.4V at 1.8mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5V to 11V single supply (or ±1.25V to ±5.5V dual supply) - enables direct operation from Li-ion, 3.3V, or 5V rails without regulation. |
| Quiescent Supply Current | ≤4µA over temperature - ensures multi-year battery life in always-on sensing nodes. |
| Reference Voltage Accuracy | 1.182V ±1% (0°C to +70°C) - provides stable, factory-trimmed threshold for precision undervoltage/overvoltage detection. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - supports direct sensing of signals near supply rails, e.g., battery voltage monitoring. |
| Propagation Delay | 12µs (10mV overdrive, 100pF load, 1MΩ pullup) - balances speed and ultra-low power for wake-up or alert generation. |
| Output Configuration | Open-drain, sinks to GND - allows wire-ORing, level shifting between domains (e.g., ±5V to 3.3V), and bipolar-to-single-ended conversion. |
| Hysteresis Control | HYST pin accepts REF − 50mV to REF - enables adjustable hysteresis (up to 100mV band) using two external resistors, eliminating need for feedback networks. |
Pinout & Package
MAX971CSA is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm pitch and standard SOIC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Connect to V− for single-supply operation; serves as output sink return path - critical for level-shifting integrity. |
| 2 (V−) | Negative supply | Connect to GND in single-supply mode; defines reference point for REF and input common-mode range. |
| 3 (IN+) | Noninverting input | Accepts input signals from V− to (V+ − 1.3V); high-impedance (±0.01nA leakage) minimizes loading on sensor sources. |
| 4 (IN−) | Inverting input | Paired with IN+ for differential comparison; identical voltage range and leakage specs as IN+. |
| 5 (HYST) | Hysteresis control | Programs hysteresis band by setting voltage between REF − 50mV and REF; enables noise-immune threshold switching. |
| 6 (REF) | Reference output | 1.182V ±1% referenced to V−; capable of sourcing 25µA/sinking 15µA - powers external dividers or drives HYST pin directly. |
| 7 (V+) | Positive supply | Accepts 2.5V–11V; supplies comparator core and reference; gate drive for output MOSFET scales with V+ magnitude. |
| 8 (OUT) | Comparator output | Open-drain N-channel MOSFET sinking to GND; supports 11V max output voltage and 50mA short-circuit current. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA over full operating temperature - extends shelf life and runtime in coin-cell–powered IoT sensors. |
| Integrated ±1% voltage reference | 1.182V trimmed bandgap reference referenced to V− - eliminates external reference IC and reduces BOM count. |
| HYST pin hysteresis programming | Two-resistor configuration sets hysteresis band up to 100mV - avoids complex feedback design and saves PCB area. |
| Wide supply range & rail-compatible inputs | Operates from 2.5V to 11V; inputs extend to V− and within 1.3V of V+ - simplifies interface with unregulated batteries or legacy analog signals. |
| GND-referenced open-drain output | Sinks to GND (not V−) - enables seamless level translation between bipolar (±5V) and single-ended (3.3V/5V) logic domains. |
Applications
| Battery Voltage Monitor | Power-Good Indicator |
|---|---|
|
Use Scenario: Monitoring Li-ion battery voltage during discharge to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Single comparator compares battery voltage (divided) against internal 1.182V reference; HYST pin adds 20mV hysteresis to prevent chatter near threshold. Use Value: Eliminates external reference and hysteresis components, reducing solution size by >30% while maintaining ±1% threshold accuracy over temperature. |
Use Scenario: Validating stable 5V supply in embedded systems before enabling microcontroller reset release. IC Role / Device Role / Timing Role: Comparator detects when regulated 5V rail exceeds 4.75V; open-drain output pulls up to 3.3V logic domain via external pullup. Use Value: GND-referenced output enables direct interfacing with 3.3V I/O without level-shifters; <4µA supply current avoids loading the monitored rail. |
| Window Detector (with MAX973CSA) | Level Translator: ±5V to 3.3V |
|
Use Scenario: Detecting if system supply stays within 4.5V–5.5V window for reliable operation. IC Role / Device Role / Timing Role: Dual comparator (MAX973CSA) uses shared REF and HYST to set upper/lower thresholds; outputs wired-OR to generate active-high "power good" signal. Use Value: Internal reference and hysteresis pins allow precise, matched thresholds without resistor matching or trimming - improves window accuracy to ±0.5%. |
Use Scenario: Converting ±5V analog sensor outputs to 3.3V logic-compatible signals in industrial data acquisition. IC Role / Device Role / Timing Role: Comparator compares ±5V input (attenuated) against 1.182V REF; open-drain OUT sinks to GND, pulled up to 3.3V. Use Value: 11V output voltage range permits safe operation even when V+ = 0V - enables robust level shifting across isolated power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921CSA | Same SO-8 package; includes ±1% reference but no HYST pin; complementary (push-pull) output instead of open-drain. | Requires external hysteresis network; unsuitable for wire-OR or level-shifting; better for driving capacitive loads directly. | Select MAX921CSA only when push-pull output and absence of hysteresis programming are acceptable trade-offs for reduced external component count. |
| TLV3701IDBVR | Single comparator in SOT-23-5; 1.8V–16V supply; no integrated reference; 350nA quiescent current; rail-to-rail inputs. | Requires external reference and hysteresis circuitry; lower supply current but higher design complexity and board area. | Choose TLV3701IDBVR for ultra-low-power applications where board space is constrained and external reference integration is feasible. |
Compared with MAX971CSA, MAX921CSA offers push-pull output and eliminates hysteresis flexibility, while TLV3701IDBVR achieves lower quiescent current but demands external reference and hysteresis components - making MAX971CSA optimal for compact, self-contained threshold detection with minimal external parts.
Availability
MAX971CSA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and level translators requiring stable component supply across industrial and consumer electronics programs.
Supply support for MAX971CSA 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, with emphasis on low-power, high-reliability solutions.
The MAX971CSA belongs to Maxim's ultra-low-power comparator family, engineered specifically for energy-constrained applications like portable medical devices, wearables, and remote sensors where micropower operation and integrated reference stability are critical.
FAQ
What is the maximum supply voltage for MAX971CSA?
The MAX971CSA supports a single-supply voltage range of 2.5V to 11V, or dual supplies from ±1.25V to ±5.5V. Absolute maximum ratings specify V+ to V− up to +12V, but functional operation is guaranteed only within the 2.5V–11V range. Exceeding 11V risks permanent damage, and operation below 2.5V degrades reference functionality and propagation delay - the MAX971CSA is not rated for sub-2.5V operation.
Does MAX971CSA require external hysteresis components?
No - the MAX971CSA features a dedicated HYST pin that enables programmable hysteresis using just two external resistors connected between REF, HYST, and V−. This eliminates the need for external positive-feedback networks. When HYST is tied directly to REF, hysteresis is disabled. The MAX971CSA's internal architecture ensures consistent hysteresis behavior without additional op-amps or precision resistors.
Can MAX971CSA operate from a single 3.3V supply?
Yes - the MAX971CSA is fully specified for 3.3V single-supply operation. At V+ = 3.3V, V− = GND, it maintains ≤4µA supply current, 1.182V ±1% reference accuracy, and proper comparator function across its input common-mode range (0V to 2.0V). Propagation delay increases slightly versus 5V operation (12µs typical at 10mV overdrive), but remains well within timing budgets for supervisory and alert applications.
What is the purpose of the separate GND pin on MAX971CSA?
The GND pin (Pin 1) on MAX971CSA serves as the dedicated return path for the open-drain output transistor - distinct from V− (Pin 2). This architecture allows the output to sink current to system ground even when V− is connected to a negative rail (e.g., in dual-supply mode), enabling robust level translation and bipolar-to-single-ended conversion. In single-supply use, both GND and V− connect to system ground, preserving noise isolation between reference/comparator core and output stage.
How accurate is the internal reference in MAX971CSA over temperature?
The internal reference in MAX971CSA is specified as 1.182V ±1% over the commercial temperature range (0°C to +70°C). Typical drift is ±0.01%/°C, resulting in <±3mV total deviation across the full range. Reference voltage vs. temperature plots in the datasheet confirm monotonic behavior with worst-case error bounded by the ±1% limit - no additional calibration is required for applications demanding stable 1.2V-level thresholds in ambient-temperature environments.
MAX971CSA 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:
- Obsolete
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- 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):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX971CSA FAQ
1.How can I place an order for MAX971CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX971CSA 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 MAX971CSA reliable?
The price and inventory of MAX971CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX971CSA is usually 5 days.
3.What payment methods are accepted for MAX971CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX971CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX971CSA?
MAX971CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX971CSA 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 MAX971CSA?
For technical support, including MAX971CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX971CSA requirements.
6.How does Aetrix verify that MAX971CSA is sourced from the original manufacturer or authorized distributors?
All MAX971CSA 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 MAX971CSA meets industry standards.
7.What is the process for return or replacement of MAX971CSA?
All MAX971CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX971CSA, 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 MAX971CSA part is unused and in its original packaging.
Return procedure for MAX971CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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