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Analog Devices Inc./Maxim Integrated MAX9051AEUT
- Part No.:
- MAX9051AEUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-6
- Datasheet:
-
MAX9051AEUT.pdf
- Description:
- IC COMPARATOR 1 W/VOLT REF SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:668
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Product details
Overview
MAX9051AEUT from Maxim Integrated is a micropower single-supply comparator with integrated 2.500V precision voltage reference, designed for battery-powered systems requiring rail-to-rail input/output operation, 40µA quiescent current, and ±0.4% initial reference accuracy (A grade). It delivers 400ns propagation delay and operates from 2.7V to 5.5V in a 6-pin SOT23 package.
For engineers reviewing the MAX9051AEUT datasheet, MAX9051AEUT pinout, MAX9051AEUT application, or MAX9051AEUT equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific use cases, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The MAX9051AEUT integrates one rail-to-rail comparator and a series-mode 2.500V voltage reference on a single CMOS die. Its comparator features ±3mV internal hysteresis, 1.0pA typical input bias current, and a common-mode input range extending 250mV beyond supply rails (VEE − 0.25V to VCC + 0.25V).
The reference uses laser-trimmed thin-film resistors and proprietary curvature correction, achieving 6ppm/°C typical temperature coefficient and stability with up to 4.7nF capacitive load - enabling direct connection to ADC reference inputs or precision threshold circuits without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into 3.3V and 5V systems without level-shifting. |
| Quiescent Supply Current | 40µA at +25°C - enables >1-year battery life in coin-cell–powered sensors with 1Hz wake-up rate. |
| Reference Output Voltage | 2.500V ±0.4% (A grade) - matches standard SAR ADC full-scale reference requirements with minimal calibration overhead. |
| Propagation Delay | 400ns at 100mV overdrive - sufficient for 1MHz window comparator timing in motor phase detection or power supply sequencing. |
| Input Offset Voltage | ±0.5mV typical - allows accurate sensing of sub-10mV differential signals (e.g., shunt voltage monitoring) without trimming. |
| Reference Tempco | 6ppm/°C typical - drift < ±125µV over −40°C to +85°C, critical for portable medical devices requiring stable thresholds. |
| Rail-to-Rail I/O | Inputs extend 250mV beyond rails; output sinks/sources 8mA - eliminates need for external level translators in mixed-voltage logic interfaces. |
Pinout & Package
MAX9051AEUT is housed in a RoHS-compliant 6-pin SOT23 package (U6-2 outline), with thermal pad omitted and pin 1 marked by a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Comparator output | Rail-to-rail push-pull stage; sources/sinks 8mA - drives LED indicators, MOSFET gates, or logic inputs directly without pull-up. |
| 2 (IN−) | Inverting input | Uncommitted input; accepts signals from VEE − 0.25V to VCC + 0.25V - enables high-side current sensing with resistor divider biasing. |
| 3 (IN+) | Noninverting input | Uncommitted input; same common-mode range as IN− - supports differential or single-ended configurations with flexible threshold placement. |
| 4 (VEE) | Negative supply | Ground reference pin; must be connected to system GND - defines lower rail for both comparator and reference sections. |
| 5 (VCC) | Positive supply | Power input for both comparator and reference; decoupling capacitor required within 5mm - ensures stable 2.500V reference under dynamic load switching. |
| 6 (REF) | Reference output | 2.500V precision source; stable with 0–4.7nF load - powers ADC references, DAC bias networks, or comparator hysteresis dividers. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 40µA supply current enables >5-year shelf life in energy-harvesting nodes with intermittent wake-up cycles. |
| Integrated 2.500V reference | Eliminates need for external reference IC or resistor divider, reducing BOM count and PCB area by ≥3 components. |
| Rail-to-rail I/O with 8mA drive | Direct interface to 3.3V/5V logic families and low-side MOSFET gates without level shifters or buffer stages. |
| Internal ±3mV hysteresis | Prevents chatter on slow-moving inputs (e.g., thermistor outputs), removing need for external positive feedback resistors. |
| Stable with 4.7nF capacitive load | Permits direct connection to ADC reference pins with standard 100nF bypass caps without oscillation risk. |
Applications
| Battery Voltage Monitor | ADC Reference Source |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging in portable medical devices. IC Role / Device Role / Timing Role: Comparator compares cell voltage against 2.500V reference-derived thresholds to trigger charge termination or low-battery warning. Use Value: 40µA quiescent current extends battery runtime; ±0.4% reference accuracy ensures consistent 3.0V/4.2V trip points across temperature. | Use Scenario: Providing stable reference to 12-bit SAR ADC in industrial sensor transmitters. IC Role / Device Role / Timing Role: MAX9051AEUT REF pin supplies 2.500V reference; comparator monitors ADC supply rail for brown-out detection. Use Value: 6ppm/°C tempco limits ADC full-scale error to < ±0.025% over −40°C to +85°C, meeting Class A sensor accuracy. |
| Motor Phase Detection | Power Supply Sequencing |
Use Scenario: Detecting zero-crossing in BLDC motor back-EMF for commutation timing. IC Role / Device Role / Timing Role: Comparator senses phase voltage crossing 2.500V mid-rail reference; 400ns delay enables ≤250kHz commutation frequency. Use Value: Rail-to-rail inputs accept full motor phase swing (0–12V); uncommitted IN−/IN+ allow configurable hysteresis via external resistors. | Use Scenario: Enabling 3.3V and 5V rails only after 1.8V core supply reaches regulation in FPGA-based systems. IC Role / Device Role / Timing Role: Two MAX9051AEUTs form window comparators monitoring each rail against 2.500V reference-derived thresholds. Use Value: Single 2.7–5.5V supply powers all comparators; 40µA per device minimizes sequencing circuit power overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator + reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9050AEUK+ | 5-pin SOT23; IN− internally tied to REF (not uncommitted); same 2.500V reference and 40µA ICC. | Fixed inverting input reduces flexibility in differential sensing but simplifies single-threshold designs. | Select MAX9050AEUK+ when threshold is derived solely from REF and board space is constrained by 5-pin footprint. |
| TLV4041IDBVR | Single comparator only (no integrated reference); requires external 2.5V reference; 650nA ICC; 3.5µs propagation delay. | Lacks reference integration - increases component count and layout complexity for precision thresholding. | Select TLV4041IDBVR only when ultra-low power (<1µA) dominates over BOM simplicity and speed requirements. |
Compared with MAX9050AEUK+, MAX9051AEUT offers uncommitted IN− for flexible threshold configuration at identical reference performance; compared with TLV4041IDBVR, it trades higher quiescent current for integrated 2.500V reference and 8.75× faster response, reducing total solution size and calibration effort.
Availability
MAX9051AEUT is available at Aetrix Electronics and suitable for battery management, precision ADC reference, motor control, and power sequencing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX9051AEUT 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 analog and mixed-signal ICs for power, sensing, and signal conditioning.
The MAX90xx family was designed for space-constrained, battery-operated systems needing combined precision comparison and voltage reference functionality in ultra-small packages like SOT23 and UCSP.
FAQ
What is the reference voltage tolerance and temperature coefficient of MAX9051AEUT?
The MAX9051AEUT features a 2.500V precision reference with ±0.4% initial accuracy (A grade) and 6ppm/°C typical temperature coefficient. These values are guaranteed over −40°C to +85°C and enable stable threshold generation for high-accuracy measurement systems without external calibration.
Does MAX9051AEUT require an external output capacitor on the REF pin?
No, MAX9051AEUT does not require an external capacitor on the REF pin for stability. It is inherently stable with capacitive loads from 0 to 4.7nF, allowing direct connection to ADC reference inputs or filtering networks without risk of oscillation.
What is the maximum load current the MAX9051AEUT reference can source or sink?
The MAX9051AEUT reference can source or sink up to ±500µA while maintaining specified accuracy. Load regulation is 2–4µV/µA when sourcing and 3.5–6µV/µA when sinking, ensuring minimal voltage shift under typical ADC or comparator bias current loads.
Can MAX9051AEUT operate from a 2.5V supply?
No, MAX9051AEUT requires a minimum supply voltage of 2.7V, as specified in its absolute maximum ratings and electrical characteristics tables. Operation below 2.7V may result in undefined reference output or comparator behavior and is not guaranteed.
How does the internal hysteresis of MAX9051AEUT affect threshold accuracy?
The MAX9051AEUT includes ±3mV internal hysteresis centered on the input offset voltage. This prevents output chatter on slow-moving or noisy inputs but introduces a 6mV total hysteresis band - a design consideration when setting precise trip points, especially near the 2.500V reference midpoint.
MAX9051AEUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 1
- Output Type:
- CMOS, Push-Pull, Rail-to-Rail, TTL
- Voltage - Supply, Single/Dual (±):
- 2.7V ~ 5.5V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 1pA @ 5V
- Current - Input Bias (Max):
- 8mA
- Current - Output (Typ):
- 72µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 450ns
- Propagation Delay (Max):
- ±3mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-6
MAX9051AEUT FAQ
1.How can I place an order for MAX9051AEUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9051AEUT 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 MAX9051AEUT reliable?
The price and inventory of MAX9051AEUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9051AEUT is usually 5 days.
3.What payment methods are accepted for MAX9051AEUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9051AEUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9051AEUT?
MAX9051AEUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9051AEUT 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 MAX9051AEUT?
For technical support, including MAX9051AEUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9051AEUT requirements.
6.How does Aetrix verify that MAX9051AEUT is sourced from the original manufacturer or authorized distributors?
All MAX9051AEUT 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 MAX9051AEUT meets industry standards.
7.What is the process for return or replacement of MAX9051AEUT?
All MAX9051AEUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX9051AEUT, 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 MAX9051AEUT part is unused and in its original packaging.
Return procedure for MAX9051AEUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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