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Analog Devices Inc./Maxim Integrated MAX803REXR+T
- Part No.:
- MAX803REXR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803REXR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,394
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Product details
Overview
MAX803REXR+T from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with open-drain active-low RESET output, designed to monitor +2.5V power supplies and assert reset during brownout or power-up conditions. It features a 2.63V reset threshold (±2.5% over temperature), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = +1V. It is used in battery-powered instrumentation and automotive control modules requiring AEC-Q100-compliant voltage monitoring.
For engineers reviewing the MAX803REXR+T datasheet, MAX803REXR+T pinout, MAX803REXR+T application, or MAX803REXR+T equivalent, this page delivers verified electrical parameters, SC70-3 package details, reset timing behavior across -40°C to +125°C, and validated alternatives for +2.5V system supervision.
Technical Context
The MAX803REXR+T implements a precision bandgap-based reset comparator with 30ppm/°C tempco, ensuring stable 2.63V threshold across its full -40°C to +125°C operating range. Its open-drain RESET output requires an external pullup and supports level-shifting - enabling interface with logic powered by voltages up to +6V independent of the monitored +2.5V VCC rail.
Reset assertion is immune to transients ≤20μs when VCC dips 100mV below threshold, and the device guarantees valid RESET state down to VCC = +1V. The SC70-3 package supports high-density PCB layouts while maintaining thermal performance up to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±2.5% over -40°C to +125°C - ensures reliable reset initiation before +2.5V supply falls below 2.57V in worst-case conditions |
| Reset Timeout | 140ms minimum after VCC rises above threshold - provides sufficient hold time for microcontroller initialization sequences |
| Supply Current | 17μA typical at +25°C, ≤60μA at +125°C - enables multi-year operation in coin-cell–powered portable instruments |
| VCC Operating Range | 1.2V to 5.5V - supports valid reset assertion even as supply decays to 1.2V, critical for graceful shutdown sequencing |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and level-shifting to higher-voltage logic domains |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial embedded applications |
| Package | SC70-3 (X3+2) - 1.25mm × 0.85mm footprint with 0.65mm pitch, suitable for space-constrained PCBs |
Pinout & Package
MAX803REXR+T is housed in a 3-pin SC70 package (package code X3+2), with 100% lead(Pb)-free/RoHS-compliant construction. Pin 1 is GND, Pin 2 is RESET (open-drain, active-low), and Pin 3 is VCC. The SC70-3 footprint matches JEDEC MO-203AB standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 - RESET | Open-drain active-low reset output | Sinks current only when asserted; requires external pullup resistor (typically 10kΩ to +2.5V or higher voltage rail) |
| 3 - VCC | Supply input | Monitored +2.5V power rail; powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V threshold | ±2.5% tolerance over full -40°C to +125°C range eliminates need for external calibration in automotive-grade designs |
| 140ms min reset pulse width | Guaranteed hold time exceeds ARM Cortex-M and PIC MCU boot requirements without external timing components |
| 12μA typical ICC | Enables >10-year battery life in always-on sensor nodes powered by CR2032 cells |
| Valid RESET to VCC = +1V | Ensures deterministic reset state during deep brownout, preventing metastability in downstream logic |
| Transient immunity | Rejects VCC glitches ≤20μs wide at 100mV overdrive - reduces false resets in electrically noisy engine-control environments |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Glucose Meter |
|---|---|
Use Scenario: Monitors +2.5V sensor reference rail in under-hood ECU exposed to thermal cycling and load-dump transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to MCU during cold-crank brownout or alternator ripple events. Use Value: AEC-Q100 qualification and -40°C to +125°C operation ensure functional safety compliance; 2.63V threshold aligns precisely with 2.5V rail tolerance limits. |
Use Scenario: Powers on/off sequencing in handheld glucose meter using single CR2032 cell with regulated +2.5V analog front-end. IC Role / Device Role / Timing Role: Generates clean power-on reset pulse to MSP430 microcontroller before ADC initialization. Use Value: 12μA quiescent current extends battery life beyond 2 years; SC70-3 package enables compact 2-layer PCB layout. |
| Industrial PLC I/O Module | Smart Energy Meter RTC Backup |
Use Scenario: Provides fail-safe reset to ARM-based controller in DIN-rail mounted PLC module operating in factory environments. IC Role / Device Role / Timing Role: Detects undervoltage on isolated +2.5V digital supply feeding FPGA configuration memory. Use Value: Open-drain output allows shared reset bus across multiple voltage domains; 140ms timeout prevents premature firmware execution. |
Use Scenario: Maintains RTC integrity during main power loss in utility meter using supercapacitor backup. IC Role / Device Role / Timing Role: Asserts reset to real-time clock IC when backup +2.5V rail drops below 2.57V during capacitor discharge. Use Value: Guaranteed reset validity down to VCC = +1V ensures RTC reset occurs before data corruption threshold is crossed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809REUR+T | Push-pull active-low RESET output; same 2.63V threshold but no external pullup required; SOT23-3 package; rated -40°C to +105°C | Not AEC-Q100 qualified; lower max temperature rating limits use in under-hood locations | Select when board space permits SOT23 and system logic accepts push-pull drive without level-shifting |
| TPS3123E12DBVR | 2.63V threshold, open-drain active-low RESET, 1.8V to 5.5V VCC range, -40°C to +125°C, SC70-3 package, 1.6μA typical ICC | Lower supply current but tighter 0.5% threshold accuracy - may require layout revision for improved noise immunity | Choose for ultra-low-power applications where 1.6μA ICC outweighs need for Maxim's transient immunity specs |
Compared with MAX803REXR+T, MAX809REUR+T simplifies BOM by eliminating the pullup resistor but sacrifices automotive qualification and high-temp capability; TPS3123E12DBVR offers superior quiescent current and accuracy but lacks Maxim's documented 20μs transient rejection at 100mV overdrive.
Availability
MAX803REXR+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, and smart energy meters requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for MAX803REXR+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 automotive, industrial, and computing applications, with emphasis on reliability, integration, and power efficiency.
The MAX803 family targets cost-sensitive, space-constrained microprocessor supervision tasks where accuracy, low power, and wide temperature operation are mandatory - especially in automotive and portable instrumentation.
FAQ
What is the exact reset threshold voltage of the MAX803REXR+T and how does it vary with temperature?
The MAX803REXR+T has a nominal reset threshold of 2.63V at +25°C, with guaranteed limits of 2.55V to 2.70V over -40°C to +85°C and 2.50V to 2.76V over -40°C to +125°C. Its temperature coefficient is 30ppm/°C, meaning threshold drift is bounded to ±0.012V across the full industrial range - critical for repeatable brownout detection in automotive ECUs where the MAX803REXR+T operates.
Does the MAX803REXR+T require an external pullup resistor, and what value is recommended?
Yes, the MAX803REXR+T features an open-drain RESET output and requires an external pullup resistor. A 10kΩ resistor to the monitored +2.5V rail is typical; values from 4.7kΩ to 100kΩ are acceptable depending on rise time and bus loading. For level-shifting to a higher voltage (e.g., +3.3V), the pullup connects to that rail instead - a key design flexibility enabled by the MAX803REXR+T's open-drain architecture.
Is the MAX803REXR+T AEC-Q100 qualified, and which stress test grades does it meet?
Yes, the MAX803REXR+T is AEC-Q100 qualified per the manufacturer's documentation, specifically meeting Grade 0 (-40°C to +125°C) for automotive applications. This qualification covers accelerated environmental stress tests including HTOL, TC, UHAST, and ESD (HBM ≥2kV), confirming suitability for under-hood deployment where the MAX803REXR+T monitors critical power rails.
How long is the reset pulse width of the MAX803REXR+T, and is it guaranteed across temperature?
The MAX803REXR+T guarantees a minimum reset pulse width of 140ms after VCC rises above the threshold, with typical values of 240ms at +25°C and up to 460ms over -40°C to +85°C (SC70 package). This timeout is fully specified and production-tested - ensuring the MAX803REXR+T meets boot timing requirements of modern MCUs like STM32 and NXP S32K without external RC networks.
Can the MAX803REXR+T operate with supply voltages below +2.5V, and down to what level does reset remain valid?
The MAX803REXR+T operates with VCC from 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1V. Below +1V, the internal comparator ceases operation and RESET becomes indeterminate - however, most microcontrollers are non-functional below +1V, so the MAX803REXR+T's specification ensures deterministic behavior across the entire usable supply range of +2.5V systems.
MAX803REXR+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX803REXR+T FAQ
1.How can I place an order for MAX803REXR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803REXR+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 MAX803REXR+T reliable?
The price and inventory of MAX803REXR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803REXR+T is usually 5 days.
3.What payment methods are accepted for MAX803REXR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX803REXR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX803REXR+T?
MAX803REXR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803REXR+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 MAX803REXR+T?
For technical support, including MAX803REXR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803REXR+T requirements.
6.How does Aetrix verify that MAX803REXR+T is sourced from the original manufacturer or authorized distributors?
All MAX803REXR+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 MAX803REXR+T meets industry standards.
7.What is the process for return or replacement of MAX803REXR+T?
All MAX803REXR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX803REXR+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 MAX803REXR+T part is unused and in its original packaging.
Return procedure for MAX803REXR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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