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Analog Devices Inc./Maxim Integrated MAX931EPA+
- Part No.:
- MAX931EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX931EPA+.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,272
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Product details
Overview
The MAX931EPA+ from Maxim Integrated is a single micropower comparator with integrated 1.182V ±2% bandgap reference, programmable hysteresis via HYST pin, and TTL/CMOS-compatible output capable of sourcing up to 40mA. It operates from +2.5V to +11V single supply (or ±1.25V to ±5.5V dual supply), features input range from V− to (V+ − 1.3V), and draws ≤4µA quiescent current over −40°C to +85°C - ideal for battery-powered threshold detection in portable instrumentation.
For engineers reviewing the MAX931EPA+ datasheet, MAX931EPA+ pinout, MAX931EPA+ application, or MAX931EPA+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed operating temperature range (−40°C to +85°C), and two rigorously cross-checked alternative comparators with documented functional trade-offs.
Technical Context
The MAX931EPA+ integrates a precision 1.182V reference referenced to V− (not GND), enabling rail-to-rail input operation down to the negative supply while maintaining ±2% accuracy across 0°C to +70°C and ±3% over −40°C to +85°C. Its unique output stage eliminates crowbar current during transitions, preventing supply-line glitches and parasitic feedback without requiring external bypassing.
Hysteresis is implemented via the HYST pin using two external resistors (REF→HYST→V−), supporting adjustable hysteresis bands up to 100mV. Input leakage is ≤±0.01nA at +25°C, common-mode rejection is 0.1–1.0 mV/V, and propagation delay is 12µs (typ) at 10mV overdrive - all specified under 5V operation with 100pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V single supply; ±1.25V to ±5.5V dual supply - supports direct interface with 3V/5V logic and bipolar sensor signals. |
| Quiescent Current | ≤4µA max over −40°C to +85°C - enables multi-year battery life in always-on monitoring systems. |
| Reference Voltage | 1.182V ±2% (0°C to +70°C), ±3% (−40°C to +85°C) referenced to V− - eliminates need for external precision reference in low-power threshold circuits. |
| Input Common-Mode Range | V− to (V+ − 1.3V) - allows detection of signals near ground or rail in single-supply configurations. |
| Output Drive | Sources ≥40mA continuously; sinks ≥5mA - directly drives LEDs, small relays, or logic inputs without external buffers. |
| Propagation Delay | 12µs typical at 10mV overdrive (5V, 100pF load) - suitable for medium-speed window detection and oscillator timing. |
| Hysteresis Control | Programmable via HYST pin (REF − 0.05V to REF) - enables stable switching without external feedback networks. |
Pinout & Package
MAX931EPA+ uses an 8-pin Plastic DIP package with lead finish Sn/Pb, rated for −40°C to +85°C industrial temperature range.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference; connect to V− for single-supply operation; output swings from V+ to GND. |
| 2 | V− | Negative supply terminal; tied to GND in single-supply mode; reference voltage is referenced to this pin. |
| 3 | IN+ | Noninverting input; accepts signals from V− to (V+ − 1.3V); input leakage ≤±0.01nA. |
| 4 | IN− | Inverting input; same voltage range and leakage as IN+; differential input offset ≤±10mV. |
| 5 | HYST | Hysteresis control input; voltage range = REF − 50mV to REF; sets hysteresis band up to 100mV. |
| 6 | REF | 1.182V ±2% reference output referenced to V−; sources/sinks ≤15µA/8µA; do not bypass. |
| 7 | V+ | Positive supply; supports up to +11V; absolute max = +12V; powers both comparator and reference. |
| 8 | OUT | Push-pull output; sinks and sources current; swings rail-to-rail (V+ to GND); no crowbar current. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | ≤4µA over full −40°C to +85°C range - extends battery life in remote sensors and wearables. |
| Integrated reference | 1.182V ±2% bandgap referenced to V− - removes external reference IC and associated layout complexity. |
| HYST pin hysteresis | Adjustable 0–100mV hysteresis using two resistors - eliminates need for external positive-feedback networks. |
| Rail-to-rail output | Swings from V+ to GND with ≥40mA source capability - directly drives LEDs or logic without level-shifting components. |
| No crowbar current | Eliminates supply-line transients during output transitions - improves system stability without mandatory bypass capacitors. |
Applications
| Battery-Powered Threshold Detector | Low-Power Oscillator Circuit |
|---|---|
|
Use Scenario: Detecting battery voltage drop below 3.0V in a handheld medical device to trigger shutdown before deep discharge. IC Role / Device Role / Timing Role: Single comparator compares divided battery voltage against internal 1.182V reference; HYST pin adds 50mV hysteresis to prevent chatter near threshold. Use Value: 4µA quiescent current preserves battery capacity; integrated reference reduces BOM count by one component; DIP package simplifies prototyping. |
Use Scenario: Generating a 1kHz square wave for clocking a low-power microcontroller sleep-wake cycle. IC Role / Device Role / Timing Role: Configured as relaxation oscillator using capacitor charging through resistor and internal reference as trip point. Use Value: Propagation delay stability (12µs typ) ensures consistent frequency; rail-to-rail output provides clean logic-level signal; no external reference needed. |
| Industrial Alarm Circuit | Portable Instrumentation Window Comparator |
|
Use Scenario: Monitoring temperature sensor output in an environmental logger to trigger audible alarm when exceeding 60°C. IC Role / Device Role / Timing Role: Compares amplified thermistor voltage against fixed 1.182V reference; output drives piezo buzzer directly via 40mA source capability. Use Value: −40°C to +85°C rating ensures reliability in uncontrolled enclosures; low input bias current avoids sensor loading errors. |
Use Scenario: Implementing undervoltage/overvoltage protection in a field-deployable data acquisition unit powered by Li-ion battery. IC Role / Device Role / Timing Role: Paired with MAX933 (dual comparator) to form window detector; MAX931EPA+ handles primary threshold with hysteresis. Use Value: Pin compatibility with MAX921 allows upgrade path to 1% reference; same DIP footprint enables drop-in replacement during qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921EPA+ | 1% reference accuracy (vs. 2%), same pinout and electrical specs otherwise; higher cost; identical −40°C to +85°C rating. | Required where reference drift must be <±10mV over temperature; suitable for precision voltage monitors and calibration circuits. | Select MAX921EPA+ when reference accuracy dominates system error budget; retains same PCB layout and drive capability. |
| TLV3011IDBVR | Single comparator only (no internal reference); 1.8V–5.5V supply; 1.2µA quiescent current; requires external reference or resistor divider. | Used where ultra-low power (<2µA) outweighs reference integration; common in energy-harvesting nodes with external precision references. | Choose TLV3011IDBVR only if external reference already exists and sub-2µA supply current is mandatory; adds design complexity. |
Compared with MAX931EPA+, MAX921EPA+ offers tighter reference accuracy at higher cost but identical footprint and drive strength, while TLV3011IDBVR reduces quiescent current by 66% but requires external reference design and sacrifices hysteresis simplicity - making MAX931EPA+ optimal for balanced low-power, integrated-reference applications.
Availability
MAX931EPA+ is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, oscillator circuits, and alarm circuits requiring stable component supply across industrial temperature ranges.
Supply support for MAX931EPA+ 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX931EPA+ belongs to the MAX931–MAX934 micropower comparator family, engineered specifically for ultra-low-power, single-supply systems requiring integrated voltage references and robust hysteresis control without external components.
FAQ
What is the operating temperature range of the MAX931EPA+?
The MAX931EPA+ is rated for −40°C to +85°C, matching the "E" grade designation in its part number. This industrial temperature range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, and applies to all electrical specifications unless otherwise noted.
Does the MAX931EPA+ require external bypass capacitors?
No - the MAX931EPA+'s output stage eliminates crowbar current during transitions, minimizing supply-line glitches and eliminating the need for power-supply bypass capacitors under low-impedance conditions. A 100nF capacitor is recommended only if supply leads are long or impedance is high, per the Board Layout and Bypassing section.
Can the MAX931EPA+ operate from a 3V supply?
Yes - the MAX931EPA+ supports single-supply operation from +2.5V to +11V. At 3V, supply current is 2.4µA (typ), input common-mode range extends from V− to V+ − 1.3V, and propagation delay increases to 14µs (typ) at 10mV overdrive, as verified in the 3V Electrical Characteristics tables.
How is hysteresis configured on the MAX931EPA+?
Hysteresis is configured using the HYST pin: connect R1 between REF and HYST, and R2 between HYST and V−. The hysteresis band equals ~2 × (REF − VHYST), with VHYST adjustable from REF − 50mV to REF. This method avoids external feedback and is detailed in the Applications Information section.
Is the MAX931EPA+ pin-compatible with any other Maxim comparators?
Yes - the MAX931EPA+ is pin-compatible with the MAX921EPA+ (1% reference version), as explicitly stated in the datasheet: "The MAX931, MAX933, and MAX934 are pin-compatible with the 1% accurate MAX921, MAX923, and MAX924, respectively." This allows direct substitution where tighter reference accuracy is required.
MAX931EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 8-PDIP
MAX931EPA+ FAQ
1.How can I place an order for MAX931EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX931EPA+ 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 MAX931EPA+ reliable?
The price and inventory of MAX931EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX931EPA+ is usually 5 days.
3.What payment methods are accepted for MAX931EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX931EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX931EPA+?
MAX931EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX931EPA+ 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 MAX931EPA+?
For technical support, including MAX931EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX931EPA+ requirements.
6.How does Aetrix verify that MAX931EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX931EPA+ 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 MAX931EPA+ meets industry standards.
7.What is the process for return or replacement of MAX931EPA+?
All MAX931EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX931EPA+, 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 MAX931EPA+ part is unused and in its original packaging.
Return procedure for MAX931EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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