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Analog Devices Inc./Maxim Integrated MAX931ESA+T
- Part No.:
- MAX931ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX931ESA+T.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
The MAX931ESA+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 supply current <4µA over –40°C to +85°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), and is used in battery-powered threshold detection and auto-off power switches.
For engineers reviewing the MAX931ESA+T datasheet, MAX931ESA+T pinout, MAX931ESA+T application, or MAX931ESA+T equivalent, key selection considerations include its ultra-low quiescent current, rail-to-rail input capability, internal reference accuracy, hysteresis programmability without external feedback, and compatibility with 3V/5V systems requiring stable low-power analog decision-making.
Technical Context
The MAX931ESA+T integrates a precision micropower comparator and a 1.182V ±2% voltage reference referenced to V–, not GND. Its unique output stage eliminates crowbar current during transitions, minimizing parasitic supply feedback and enabling stable operation without strict layout constraints.
It supports hysteresis configuration via the HYST pin using two external resistors - enabling adjustable hysteresis bands up to 100mV - and features an input voltage range that includes the negative rail and extends within 1.3V of V+, making it suitable for single-supply sensing near ground or dual-supply bipolar signal monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | <4µA max over –40°C to +85°C - enables multi-year battery life in always-on sensor nodes. |
| Reference Voltage | 1.182V ±2% (0°C to +70°C), 1.147V to 1.217V (–40°C to +85°C) - provides stable trip point without external reference IC. |
| Input Common-Mode Range | V– to (V+ – 1.3V) - supports direct sensing of signals down to ground in single-supply systems. |
| Output Drive | Sources up to 40mA continuously; sinks ≥5mA - drives LEDs, MOSFET gates, or logic inputs directly without buffer stages. |
| Propagation Delay | 12µs typical at 10mV overdrive - balances speed and ultra-low power for non-critical timing decisions. |
| Supply Voltage Range | +2.5V to +11V single supply or ±1.25V to ±5.5V dual supply - accommodates Li-ion, alkaline, and industrial rails. |
| Hysteresis Control | HYST pin accepts 0–50mV below REF - enables precise, resistor-programmed hysteresis without feedback networks. |
Pinout & Package
MAX931ESA+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), rated for –40°C to +85°C operation, with exposed pad for thermal enhancement and surface-mount compatibility.
| 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 level-shifting needed. |
| 2: V+ | Positive supply | Accepts +2.5V to +11V; powers comparator core and reference - supports wide-input-voltage battery monitoring. |
| 3: REF | Reference output | 1.182V ±2% w.r.t. V–; sources ≤15µA/sinks ≥8µA - used as stable threshold source; must not be bypassed. |
| 4: HYST | Hysteresis control input | Accepts voltage from REF to (REF – 50mV); sets hysteresis band via R1/R2 divider - enables noise-immune thresholding without op-amp feedback. |
| 5: IN– | Inverting input | Differential input node; input leakage ±0.01nA at +25°C - high-impedance sensing of voltage dividers or transducer outputs. |
| 6: IN+ | Noninverting input | Differential input node; same leakage spec as IN– - used for active-high threshold detection or window comparator top leg. |
| 7: V– | Negative supply | Connect to GND for single-supply use; defines reference and output swing baseline - enables true rail-to-rail input and GND-referenced output. |
| 8: GND | Ground | System ground reference; tied to V– internally for single-supply operation - ensures output swings to 0V, critical for digital interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | <4µA over full temperature range - extends shelf life and runtime in coin-cell–powered IoT endpoints. |
| Integrated 2% reference | 1.182V ±2% bandgap output referenced to V– - eliminates need for external reference, reducing BOM count and PCB area. |
| No crowbar switching current | Eliminates supply glitches during output transitions - prevents false triggering in shared-rail systems without large bypass caps. |
| Programmable hysteresis | Configurable 0–100mV hysteresis band via HYST pin and two resistors - simplifies noise immunity design vs. discrete positive-feedback circuits. |
| Rail-to-rail input capability | Common-mode range includes V– and extends to (V+ – 1.3V) - enables direct battery voltage monitoring from 0V to ~9.7V on 11V rail. |
Applications
| Threshold Detector | Auto-Off Power Switch |
|---|---|
Use Scenario: Monitoring battery voltage to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Single comparator compares divided battery voltage against internal 1.182V reference. Use Value: Eliminates external reference and reduces total solution current to <4µA, enabling >5-year operation on CR2032. | Use Scenario: Enabling timed shutdown of portable instrument after user inactivity. IC Role / Device Role / Timing Role: Comparator output controls MOSFET gate; RC network on HYST sets timeout delay. Use Value: Achieves 3.5µA quiescent system current while delivering 40mA switched output - no auxiliary LDO or timer IC required. |
| Window Comparator | LED Bar-Graph Level Gauge |
Use Scenario: Detecting valid supply voltage range (e.g., 4.5V–5.5V) in USB-powered devices. IC Role / Device Role / Timing Role: Dual comparators (e.g., MAX932/MAX933) compare upper/lower thresholds derived from REF. Use Value: Internal reference ensures matched thresholds; programmable hysteresis prevents chatter near trip points. | Use Scenario: Visual battery level indication using four LEDs driven directly by comparator outputs. IC Role / Device Role / Timing Role: Four MAX931 units (or quad variant) compare stepped input against REF-derived thresholds. Use Value: 40mA source capability drives LEDs without current-limiting resistors in series with cathodes - simplifies layout and improves efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator-with-reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX921ESA+ | 1% reference accuracy (vs. 2%), same pinout and package - higher precision but 20% higher supply current (≤5µA). | Required where trip-point stability over temperature exceeds ±2% tolerance - e.g., medical sensor calibration. | Select MAX921ESA+ when reference accuracy dominates power budget; verify hysteresis resistor recalibration due to tighter REF tolerance. |
| TLV3011IDBVR | Single comparator with 1.24V reference, 1.8V–5.5V supply, 1.2µA IQ - lower power but no HYST pin; hysteresis requires external feedback. | Suitable for ultra-low-power (<2µA) designs where hysteresis is fixed or unnecessary - e.g., wake-up interrupt generators. | Choose TLV3011IDBVR only if supply voltage is ≤5.5V and external hysteresis design is acceptable; lacks HYST pin simplicity. |
Compared with MAX921ESA+, the MAX931ESA+ trades reference accuracy for lower quiescent current and simpler hysteresis implementation; compared with TLV3011IDBVR, it offers superior hysteresis configurability and wider supply range at the cost of higher IQ - making it optimal for 3V–5V battery systems needing robust, low-effort noise immunity.
Availability
MAX931ESA+T is available at Aetrix Electronics and suitable for battery-powered systems, threshold detectors, and auto-off power switches requiring stable component supply across industrial temperature ranges and long-lifecycle deployments.
Supply support for MAX931ESA+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) designs precision analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX931 belongs to the MAX93x micropower comparator family, engineered specifically for ultra-low-power, single-supply sensing applications where integrated reference and hysteresis simplify design while maintaining sub-4µA operation across extended temperature ranges.
FAQ
What is the operating temperature range for the MAX931ESA+T?
The MAX931ESA+T is specified for –40°C to +85°C operation, matching the "E" grade suffix in its ordering code. This extended temperature range supports deployment in automotive cabins, outdoor sensors, and industrial control enclosures where ambient conditions exceed commercial limits. All electrical characteristics - including supply current <4µA and reference voltage 1.147V to 1.217V - are guaranteed across this full range.
Can the MAX931ESA+T operate from a 3V supply?
Yes, the MAX931ESA+T operates from +2.5V to +11V single supply, so 3V is fully supported. At 3V, supply current remains <4µA, input common-mode range extends from V– to 1.7V, and propagation delay increases slightly to 14µs (vs. 12µs at 5V). The internal 1.182V reference remains functional, enabling accurate threshold detection even at minimum supply.
How is hysteresis configured on the MAX931ESA+T?
Hysteresis on the MAX931ESA+T is configured using the HYST pin: connect resistor R1 between REF and HYST, and R2 between HYST and V–. The hysteresis band (VHB) ≈ 2 × (VREF – VHYST), with VHYST adjustable from REF down to (REF – 50mV). For example, setting VHYST = REF – 25mV yields ~50mV hysteresis - eliminating need for external feedback resistors or op-amps.
Does the MAX931ESA+T require a bypass capacitor on the REF pin?
No - the MAX931ESA+T datasheet explicitly states "Do not bypass the REF output." Bypassing REF introduces instability and increases noise coupling. The reference is designed for direct connection to resistor dividers or HYST networks. If noise sensitivity is observed, improve board layout: minimize trace length between REF and HYST/IN pins, and avoid routing REF near noisy outputs or switching nodes.
Is the MAX931ESA+T pin-compatible with any other Maxim comparators?
Yes, the MAX931ESA+T is pin-compatible with the MAX921ESA+ (1% reference version) per Maxim's datasheet: "The MAX931 and MAX921 are pin-compatible." This allows drop-in replacement where higher reference accuracy is later required. However, it is not pin-compatible with MAX932/MAX933 (dual) or MAX934 (quad), which have different pin counts and functions.
MAX931ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX931ESA+T FAQ
1.How can I place an order for MAX931ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX931ESA+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 MAX931ESA+T reliable?
The price and inventory of MAX931ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX931ESA+T is usually 5 days.
3.What payment methods are accepted for MAX931ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX931ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX931ESA+T?
MAX931ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX931ESA+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 MAX931ESA+T?
For technical support, including MAX931ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX931ESA+T requirements.
6.How does Aetrix verify that MAX931ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX931ESA+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 MAX931ESA+T meets industry standards.
7.What is the process for return or replacement of MAX931ESA+T?
All MAX931ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX931ESA+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 MAX931ESA+T part is unused and in its original packaging.
Return procedure for MAX931ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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