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Analog Devices Inc./Maxim Integrated MAX931CUA
- Part No.:
- MAX931CUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX931CUA.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,437
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Product details
Overview
The MAX931CUA from Maxim Integrated is a single micropower comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, TTL/CMOS-compatible output that sources up to 40mA and sinks ≥5mA, and operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply). It targets battery-powered threshold detection where ultra-low 4µA max quiescent current and rail-to-rail input range (V− to V+ −1.3V) are critical.
For engineers reviewing the MAX931CUA datasheet, MAX931CUA pinout, MAX931CUA application, or MAX931CUA equivalent, key selection criteria include its guaranteed 0°C to +70°C commercial temperature range, 8-pin SO package, 12µs propagation delay at 10mV overdrive, absence of crowbar current during switching, and compatibility with low-noise 3V/5V systems requiring stable internal reference and hysteresis without external feedback.
Technical Context
The MAX931CUA integrates a precision 1.182V reference referenced to V− (not GND), enabling accurate threshold setting independent of ground noise. Its comparator input stage supports common-mode voltages from V− to V+ −1.3V, and the HYST pin allows adjustable hysteresis using two resistors-eliminating need for external positive-feedback networks.
The output stage delivers continuous 40mA source current and >5mA sink current while maintaining sub-4µA quiescent supply current across temperature. Propagation delay is 12µs (typical) at 10mV overdrive, and the architecture suppresses power-supply glitches during logic transitions, reducing parasitic feedback and easing PCB layout.
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 operation in 3V/5V battery systems and bipolar signal monitoring. |
| Quiescent Supply Current | <4µA max over 0°C to +70°C; ensures multi-year battery life in always-on sensor nodes and portable instrumentation. |
| Reference Voltage | 1.182V ±2% (0°C to +70°C); provides stable, factory-trimmed threshold reference without external components. |
| Propagation Delay | 12µs typical at 10mV overdrive; supports reliable timing in oscillator circuits and fast-response alarm triggers. |
| Input Common-Mode Range | V− to V+ −1.3V; allows direct sensing of signals near supply rails, e.g., battery voltage monitoring down to V−. |
| Output Drive Capability | Sources 40mA continuously; drives LEDs, small relays, or logic inputs directly-eliminating external buffer stages. |
| Hysteresis Control | Programmable via HYST pin (REF to REF −50mV); enables precise noise immunity tuning with two resistors, no op-amp feedback required. |
Pinout & Package
MAX931CUA is housed in an 8-pin SO (Small Outline) package, surface-mount, 150 mil width, RoHS-compliant, rated for 0°C to +70°C operation.
| 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 crowbar current during transition. |
| 2 V− | Negative supply | Connect to GND for single-supply operation; output swing referenced to this pin, not GND. |
| 3 GND | Ground | Connect to V− for single-supply use; establishes reference for output stage and internal circuitry. |
| 4 V+ | Positive supply | Accepts +2.5V to +11V; powers comparator core and reference; bypassing recommended only if supply impedance is high. |
| 5 IN+ | Noninverting input | Accepts input from V− to V+ −1.3V; low leakage (±0.01nA typ) preserves accuracy in high-impedance sensor interfaces. |
| 6 IN− | Inverting input | Same voltage range and leakage as IN+; used with IN+ to set trip point relative to internal reference or external threshold. |
| 7 HYST | Hysteresis control | Accepts voltage from REF to REF −50mV; sets hysteresis band (up to 100mV) without external feedback components. |
| 8 REF | Reference output | 1.182V ±2% above V−; supplies stable bias for thresholds; must not be bypassed; capable of sourcing 15µA/sinking 8µA. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | <4µA max over full 0°C to +70°C range-enables decade-scale operation on coin-cell batteries. |
| Integrated 2% reference | 1.182V ±2% bandgap output referenced to V−-reduces BOM count and eliminates external reference IC or resistor divider drift. |
| HYST pin hysteresis | Adjustable hysteresis (0–100mV) using two resistors-no op-amp, no feedback loop, no stability analysis required. |
| No crowbar current | Eliminates supply-line glitches during output transitions-prevents parasitic feedback and improves system-level noise immunity. |
| High-output drive | 40mA continuous source current-directly drives LEDs, MOSFET gates, or logic loads without external drivers. |
Applications
| Threshold Detector | Window Comparator |
|---|---|
Use Scenario: Monitoring battery voltage to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Single comparator compares sensed battery voltage against 1.182V reference scaled by resistor divider; HYST pin adds 50mV hysteresis to prevent chatter near threshold. Use Value: Eliminates need for external reference and hysteresis circuitry-reducing component count by ≥4 parts and PCB area by >15 mm². |
Use Scenario: Detecting valid 5V supply range (4.5V–5.5V) in embedded power management. IC Role / Device Role / Timing Role: Dual comparator (e.g., MAX933) uses shared REF and HYST to generate undervoltage/overvoltage flags; outputs ANDed for "power-good" signal. Use Value: Internal reference ensures consistent trip points across temperature; HYST-based hysteresis avoids mismatch errors from discrete resistor networks. |
| Oscillator Circuit | Alarm Circuit |
Use Scenario: Building relaxation oscillator for LED blink rate control in portable devices. IC Role / Device Role / Timing Role: MAX931CUA configured with capacitor charging through resistor and discharge via open-drain output; REF sets upper/lower thresholds. Use Value: 12µs propagation delay and rail-to-rail input enable stable oscillation at 1–10 Hz with <±2% frequency tolerance over temperature. |
Use Scenario: Smoke detector analog front-end triggering audible alarm when sensor resistance drops below threshold. IC Role / Device Role / Timing Role: Compares filtered sensor voltage to REF-derived threshold; HYST prevents false alarms from EMI-induced transients. Use Value: 4µA quiescent current extends standby battery life to >5 years; 40mA output drives piezo buzzer directly-no transistor stage needed. |
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, package, and electrical specs except reference tolerance and temp range (0°C to +70°C). | Required where threshold stability <±10mV is mandatory across temperature, e.g., precision data acquisition front-ends. | Select MAX921CSA when reference accuracy dominates system error budget; otherwise MAX931CUA offers lower cost and identical functionality. |
| TLV3011IDBVR | Single comparator with 1.25V reference; 1.8V–5.5V supply; 1.2µA quiescent current; no HYST pin-hysteresis requires external feedback. | Better suited for ultra-low-power (<2µA) applications where reference accuracy is secondary and board space permits external resistors. | Choose TLV3011IDBVR only if supply voltage <2.5V is required or quiescent current <2µA is critical; MAX931CUA provides superior hysteresis integration and drive strength. |
Compared with MAX921CSA, MAX931CUA trades 1% reference accuracy for lower cost and identical pinout-making it ideal for cost-sensitive consumer battery monitors. Against TLV3011IDBVR, MAX931CUA delivers higher output drive (40mA vs. 10mA) and integrated hysteresis-reducing design effort and component count in industrial threshold detectors.
Availability
MAX931CUA is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, oscillator circuits, and alarm circuits requiring stable component supply with guaranteed 0°C to +70°C operation and long-term availability.
Supply support for MAX931CUA 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, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX931CUA belongs to the MAX931–MAX934 micropower comparator family, engineered specifically for ultra-low-power, single-supply applications where integrated reference and hysteresis simplify threshold detection in portable and remote-sensing systems.
FAQ
What is the operating temperature range of the MAX931CUA?
The MAX931CUA is specified for commercial temperature operation from 0°C to +70°C. This range is explicitly defined in the Ordering Information table and confirmed in the Absolute Maximum Ratings section. The 'C' suffix in MAX931CUA denotes the commercial grade, distinguishing it from extended-range variants like MAX931ESA (−40°C to +85°C). All electrical characteristics-including supply current, reference voltage, and propagation delay-are guaranteed within this 0°C to +70°C window.
Does the MAX931CUA require external hysteresis components?
No-the MAX931CUA includes 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 op-amp feedback networks. The HYST pin accepts voltages from REF down to REF −50mV, allowing hysteresis bands up to 100mV. When hysteresis is not needed, HYST is simply tied to REF-no additional components required.
Can the MAX931CUA operate from a 3V supply?
Yes-the MAX931CUA is fully specified for operation from +2.5V to +11V single supply, including 3V. Electrical Characteristics tables explicitly list performance at 3V (e.g., supply current = 2.4–3.0µA typ, propagation delay = 14µs). Input common-mode range remains V− to V+ −1.3V, so at 3V supply, usable input span is 0V to 1.7V-sufficient for most low-voltage sensor interfaces.
What is the function of the REF pin on the MAX931CUA?
The REF pin outputs a precision 1.182V ±2% voltage referenced to V− (not GND), generated by an internal bandgap circuit. It is designed to serve as a stable threshold reference for the comparator inputs and can source up to 15µA or sink 8µA. The datasheet explicitly warns: "Do not bypass the REF output." Its voltage accuracy and low temperature drift make it suitable for setting trip points in battery monitors, level detectors, and window comparators without external references.
Is the MAX931CUA pin-compatible with any higher-accuracy alternatives?
Yes-the MAX931CUA is pin-compatible with the MAX921CSA, which features a 1% accurate reference instead of 2%. The datasheet states: "The MAX931, MAX933, and MAX934 are pin-compatible with the 1% accurate MAX921, MAX923, and MAX924, respectively." Both share identical 8-pin SO packaging, pin assignments, supply ranges, and output drive capability-enabling drop-in replacement where tighter reference tolerance is required.
MAX931CUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX931CUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX931CUA 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 reliable?
The price and inventory of MAX931CUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX931CUA is usually 5 days.
3.What payment methods are accepted for MAX931CUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX931CUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX931CUA?
MAX931CUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX931CUA 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?
For technical support, including MAX931CUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX931CUA requirements.
6.How does Aetrix verify that MAX931CUA is sourced from the original manufacturer or authorized distributors?
All MAX931CUA 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 meets industry standards.
7.What is the process for return or replacement of MAX931CUA?
All MAX931CUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX931CUA, 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 part is unused and in its original packaging.
Return procedure for MAX931CUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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