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Analog Devices Inc./Maxim Integrated MAX931CUA+T
- Part No.:
- MAX931CUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX931CUA+T.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
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Product details
Overview
The MAX931CUA+T from Maxim Integrated is a single micropower comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible output capable of sourcing up to 40mA, and ultra-low 4µA max supply current over 0°C to +70°C. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), with input common-mode range extending from V− to V+ − 1.3V - ideal for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the MAX931CUA+T datasheet, MAX931CUA+T pinout, MAX931CUA+T application, or MAX931CUA+T equivalent, key selection criteria include its rail-to-rail input capability down to V−, internal reference accuracy and temperature drift, hysteresis programming method, output drive strength under low quiescent current, and compatibility with 3V/5V systems requiring stable low-power analog sensing.
Technical Context
The MAX931CUA+T integrates a precision 1.182V ±2% reference referenced to V− (not GND), enabling self-contained threshold generation without external components. Its comparator features an output stage that continuously sources up to 40mA while eliminating crowbar current during transitions - reducing parasitic supply feedback and improving layout tolerance.
Input voltage range spans V− to (V+ − 1.3V), supporting operation near ground in single-supply configurations. Hysteresis is implemented via the HYST pin using two external resistors (REF→HYST→V−), delivering adjustable hysteresis bands up to 100mV without feedback networks or complex calculations.
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) - supports direct interfacing with 3V/5V logic and battery inputs down to 2.5V. |
| Quiescent Supply Current | <4µA max over 0°C to +70°C - enables multi-year operation on coin-cell batteries in always-on monitoring circuits. |
| Reference Voltage | 1.182V ±2% at +25°C, referenced to V− - provides stable, factory-trimmed threshold source independent of V+ or GND. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - allows detection of signals down to ground level in single-supply systems without level-shifting. |
| Output Drive Capability | Sources up to 40mA continuously; sinks ≥5mA - drives LEDs, MOSFET gates, or logic inputs directly without external buffers. |
| Propagation Delay | 12µs typical at 10mV overdrive - balances speed and ultra-low power for non-critical timing applications like battery cutoff or alarm triggering. |
| Hysteresis Control | Programmable via HYST pin (REF − 0.05V to REF) - enables precise noise immunity tuning using only two resistors, no op-amp feedback required. |
Pinout & Package
MAX931CUA+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), pin-compatible with SO and DIP variants. The package supports reflow soldering and offers compact footprint for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Comparator output | Sinks and sources current; swings from V+ to GND - TTL/CMOS compatible with +5V supply; no pull-up needed. |
| 2 - V− | Negative supply | Connect to GND for single-supply operation; defines reference and input common-mode lower bound. |
| 3 - IN+ | Noninverting input | Accepts signals from V− to V+ − 1.3V - enables ground-referenced sensing in battery-monitoring applications. |
| 4 - IN− | Inverting input | Same voltage range as IN+; used with internal reference or external threshold for comparator decision logic. |
| 5 - HYST | Hysteresis control input | Accepts voltage from REF − 50mV to REF - sets hysteresis band width via resistor divider; eliminates external feedback. |
| 6 - REF | Reference output | 1.182V ±2% w.r.t. V− - supplies precise threshold for IN+ or IN−; must not be bypassed or loaded beyond ±15µA. |
| 7 - V+ | Positive supply | Accepts +2.5V to +11V - powers both comparator core and reference; supports wide-input-voltage industrial sensors. |
| 8 - GND | Ground reference | Connect to V− in single-supply mode; provides return path for output current and reference sink current. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | <4µA max over full commercial temperature range - extends battery life in IoT edge nodes and wearable health monitors. |
| Integrated 1.182V ±2% reference | Referenced to V−, not GND - simplifies single-supply design by eliminating need for precision external voltage dividers or regulators. |
| HYST pin-based hysteresis | Adjustable 0–100mV hysteresis using two resistors - removes requirement for op-amp feedback loops and reduces component count in noise-prone environments. |
| No crowbar switching current | Eliminates supply rail glitches during output transitions - improves system stability without mandatory local bypass capacitors. |
| 40mA continuous output source | Drives LEDs, small relays, or MOSFET gates directly - avoids external driver stages in compact power management circuits. |
Applications
| Battery Voltage Monitor | Threshold Detector for Portable Sensors |
|---|---|
|
Use Scenario: Detecting low-battery condition in handheld medical devices powered by Li-ion or alkaline cells. IC Role / Device Role / Timing Role: Comparator compares battery voltage against internal 1.182V reference scaled by resistor divider; HYST pin adds noise margin to prevent false triggers during load transients. Use Value: Enables reliable shutdown at ~2.8V with <4µA quiescent draw - preserves remaining capacity and prevents deep discharge damage. |
Use Scenario: Monitoring output of low-power environmental sensors (e.g., thermistors, photodiodes) in wireless sensor nodes. IC Role / Device Role / Timing Role: Converts analog sensor output into clean digital signal; internal reference eliminates need for external precision voltage source. Use Value: Reduces BOM count by 2–3 components per channel while maintaining ±2% threshold accuracy across 0°C to +70°C. |
| Auto-Shutoff Power Switch | LED Bar-Graph Level Indicator |
|
Use Scenario: Controlling power to auxiliary circuitry (e.g., display backlight, radio module) based on user activity timeout. IC Role / Device Role / Timing Role: Acts as timer-comparator: RC network charges toward REF; when IN+ crosses threshold, OUT turns off power FET. Use Value: Achieves 92-second auto-off with 2MΩ/10µF RC and draws only 3.5µA quiescent - extends standby time in battery-operated equipment. |
Use Scenario: Visual battery charge level indication in portable test equipment using discrete LEDs. IC Role / Device Role / Timing Role: Four-stage level detector where each MAX931CUA+T drives one LED; reference and resistor ladder set 25%/50%/75%/100% thresholds. Use Value: Leverages 40mA output drive to illuminate LEDs directly - eliminates current-limiting resistors and driver ICs, saving PCB area and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921CSA+ | 1% reference accuracy (vs. 2%), same pinout and µMAX package, identical quiescent current and supply range. | Required where tighter threshold tolerance is critical (e.g., precision voltage supervision, calibration circuits). | Select MAX921CSA+ when ±1% reference drift is mandatory; otherwise MAX931CUA+T offers lower cost and sufficient accuracy for general-purpose battery monitoring. |
| TLV3011IDBVR | Single comparator with 1.24V reference, 1.8V–5.5V supply, 1.2µA quiescent current, but no HYST pin - hysteresis requires external feedback. | Better suited for ultra-low-power (<2µA) applications where hysteresis can be added externally and reference voltage flexibility is needed. | Choose TLV3011IDBVR only if sub-2µA supply current is essential and board space allows external hysteresis resistors; MAX931CUA+T provides simpler integration. |
Compared with MAX921CSA+, the MAX931CUA+T trades ±1% reference accuracy for lower unit cost and identical functionality in non-critical thresholding. Against TLV3011IDBVR, it delivers higher output drive and integrated hysteresis control at the expense of slightly higher quiescent current - favoring robustness over minimal power in portable industrial tools.
Availability
MAX931CUA+T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, oscillator circuits, and alarm circuits requiring stable component supply with guaranteed commercial-temperature performance and long-term production continuity.
Supply support for MAX931CUA+T 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, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX931CUA+T belongs to the MAX931–MAX934 micropower comparator family designed specifically for ultra-low-power, single-supply sensing and monitoring in portable and energy-harvesting systems where reference integration and hysteresis simplicity are critical.
FAQ
What is the operating temperature range for the MAX931CUA+T?
The MAX931CUA+T is specified for the commercial temperature range of 0°C to +70°C. This is confirmed in the Ordering Information table, where "C" denotes the commercial grade, and the device is packaged in an 8-pin µMAX variant rated for this range. The internal 1.182V reference maintains ±2% accuracy across this interval.
Can the MAX931CUA+T operate from a 3V supply?
Yes, the MAX931CUA+T operates from +2.5V to +11V single supply, so 3V is fully supported. Electrical Characteristics tables explicitly list 3V operation data, including supply current (2.4–3.0µA typ), input offset voltage (±10mV), and response time (14µs). Performance remains stable with no derating required.
How is hysteresis implemented on the MAX931CUA+T?
Hysteresis on the MAX931CUA+T is implemented using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band equals twice (REF − VHYST); maximum VHYST = REF − 50mV yields up to 100mV hysteresis. No external op-amp or feedback loop is needed - the method is documented in the Applications Information section.
Is the internal reference of the MAX931CUA+T referenced to GND or V−?
The internal 1.182V reference of the MAX931CUA+T is referenced to V−, not GND. This is explicitly stated in the Detailed Description: "The internal bandgap voltage reference has an output of 1.182V above V−." In single-supply operation where V− = GND, the reference appears GND-referenced; in dual-supply use, it tracks V−.
What is the maximum continuous output source current of the MAX931CUA+T?
The MAX931CUA+T provides up to 40mA continuous output source current, as confirmed in the General Description ("unique output stage continuously sources as much as 40mA") and Typical Operating Characteristics (Short-Circuit Source Current vs. Supply Voltage plot shows >40mA at V+ = 5V). This enables direct LED or MOSFET gate driving without external buffers.
MAX931CUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- CMOS, TTL
- Voltage - Supply, Single/Dual (±):
- 2.5V ~ 11V, ±1.25V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 0.015mA @ 5V
- Current - Output (Typ):
- 4µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
MAX931CUA+T FAQ
1.How can I place an order for MAX931CUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX931CUA+T 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 MAX931CUA+T reliable?
The price and inventory of MAX931CUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX931CUA+T is usually 5 days.
3.What payment methods are accepted for MAX931CUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX931CUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX931CUA+T?
MAX931CUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX931CUA+T 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 MAX931CUA+T?
For technical support, including MAX931CUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX931CUA+T requirements.
6.How does Aetrix verify that MAX931CUA+T is sourced from the original manufacturer or authorized distributors?
All MAX931CUA+T 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 MAX931CUA+T meets industry standards.
7.What is the process for return or replacement of MAX931CUA+T?
All MAX931CUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX931CUA+T, 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 MAX931CUA+T part is unused and in its original packaging.
Return procedure for MAX931CUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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