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Analog Devices Inc./Maxim Integrated MAX803ZEXR+T
- Part No.:
- MAX803ZEXR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803ZEXR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,281
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Product details
Overview
MAX803ZEXR+T from Maxim Integrated is a 3-pin SC70-packaged microprocessor supervisory circuit with open-drain active-low RESET output, designed to monitor +2.5V power supplies. It asserts reset when VCC falls below 2.32V (typ), holds reset for ≥140ms after VCC recovers, operates from -40°C to +125°C, draws only 17µA (typ) at 2.5V, and guarantees valid reset down to VCC = 1V - used in automotive and industrial embedded systems requiring high-temperature reliability.
For engineers reviewing the MAX803ZEXR+T datasheet, MAX803ZEXR+T pinout, MAX803ZEXR+T application, or MAX803ZEXR+T equivalent, this page delivers verified electrical parameters, thermal operating limits, SC70 package footprint details, reset timing behavior under brownout, and validated alternatives for +2.5V supply monitoring in AEC-Q100-compliant designs.
Technical Context
The MAX803ZEXR+T implements a precision voltage comparator with 30ppm/°C tempco to detect VCC drops below its 2.32V threshold, triggering an open-drain RESET signal that remains asserted for ≥140ms after VCC exceeds the threshold. Its internal design ensures immunity to fast transients (e.g., ≤20µs negative glitches at 100mV overdrive) and maintains correct logic state down to VCC = 1V.
Unlike push-pull variants (MAX809/MAX810), the MAX803ZEXR+T requires an external pullup resistor on RESET, enabling level-shifting across supply domains - e.g., monitoring a +2.5V rail while driving a +3.3V or +5V reset line - and supports bidirectional μP reset pins such as those found in Motorola 68HC11 derivatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (typ) at +25°C; ensures reliable reset assertion before +2.5V supply drops to 2.22V (min) over full -40°C to +125°C range |
| Reset Timeout Duration | ≥140ms (min) after VCC recovery; prevents premature μP release during slow-rising or noisy power rails |
| Supply Current | 17µA (typ) at VCC = 2.5V, TA = -40°C to +85°C; enables multi-year battery operation in portable instrumentation |
| Operating Temperature | -40°C to +125°C; qualified per AEC-Q100 for under-hood automotive and industrial control applications |
| VCC Range | 1.2V to 5.5V; allows functional reset assertion even during deep brownout conditions down to 1.2V |
| RESET Output Type | Open-drain active-low; requires external pullup but supports mixed-voltage system reset coordination |
| Reset Comparator Tempco | 30ppm/°C; minimizes threshold drift across temperature, critical for stable reset margin in wide-temp environments |
Pinout & Package
The MAX803ZEXR+T is housed in a 3-pin SC70 package (package code X3+2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads compatible with standard reflow profiles (peak 260°C). Pin 1 is GND, Pin 2 is RESET (open-drain), and Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance to ensure accurate threshold detection |
| 2 (RESET) | Open-drain active-low reset output | Sinks current when asserted; requires external pullup to define high-level voltage and enable multi-supply reset coordination |
| 3 (VCC) | Supply input | Powers internal circuitry and defines monitored rail; accepts 1.2V–5.5V; valid reset guaranteed down to 1.2V |
Key Features
| Feature | Design Value |
|---|---|
| High-accuracy reset threshold | 2.32V ±0.03V (typ) at +25°C ensures reset occurs within 5% of nominal +2.5V supply, eliminating uncertainty zones near 10% dropout |
| Extended temperature operation | Functional from -40°C to +125°C with full reset timing and threshold specification - suitable for engine control units and industrial PLCs |
| Transient immunity | Immune to VCC glitches ≤20µs duration at 100mV overdrive, reducing false resets in electrically noisy environments |
| Low-power supervision | 17µA typical supply current at 2.5V enables use in always-on battery-backed systems without compromising runtime |
| Open-drain flexibility | Allows RESET line to be pulled up to any voltage ≤6.0V, enabling interoperability between +2.5V monitored rail and higher-voltage logic domains |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors +2.5V sensor reference rail in under-hood ECU modules exposed to ambient temperatures up to +125°C. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to microcontroller during cold-crank brownout or alternator ripple-induced dips. Use Value: Guarantees ≥140ms reset hold time after VCC recovery, preventing corrupted flash writes during unstable power-up sequences. | Use Scenario: Provides fail-safe reset for ARM-based controller in factory-floor PLCs operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: Voltage supervisor detecting undervoltage on isolated +2.5V I/O interface supply, holding processor in reset until stable. Use Value: 30ppm/°C tempco maintains tight threshold stability across -40°C to +125°C, avoiding spurious resets during thermal cycling. |
| Portable Medical Diagnostic Device | Battery-Powered Smart Sensor Node |
Use Scenario: Ensures deterministic startup of low-power ADC and Bluetooth SoC in handheld ultrasound probe powered by Li-ion battery. IC Role / Device Role / Timing Role: Reset generator monitoring regulated +2.5V analog supply; open-drain output pulled to +3.3V domain for SoC compatibility. Use Value: 17µA supply current extends battery life; valid reset down to VCC = 1V prevents undefined states during deep discharge. | Use Scenario: Supervises +2.5V rail powering MEMS accelerometer and LoRaWAN transceiver in remote environmental sensor node. IC Role / Device Role / Timing Role: Brownout detector asserting reset during battery sag below 2.32V, synchronized with wake-up timer to avoid partial initialization. Use Value: Immunity to ≤20µs transients eliminates false triggers from switching regulator noise, improving field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809ZEXR+T | Push-pull active-low RESET output; same 2.32V threshold, SC70 package, -40°C to +125°C rating | Eliminates need for external pullup resistor but cannot level-shift across supply domains | Select when board layout prohibits external components or when driving CMOS inputs directly without voltage translation |
| TPS3808G12DBVR | 2.32V threshold, push-pull active-low, SOT23-3, -40°C to +125°C, 1.6µA quiescent current | Lower supply current and tighter threshold tolerance (±0.5%), but lacks transient immunity specs beyond 10µs | Select when ultra-low power dominates design priority and transient environment is well-controlled via PCB layout |
Compared with MAX803ZEXR+T, MAX809ZEXR+T removes external component dependency but sacrifices voltage-domain flexibility, while TPS3808G12DBVR reduces current draw significantly yet offers less documented glitch immunity - making MAX803ZEXR+T optimal where open-drain coordination across mixed supplies is required.
Availability
MAX803ZEXR+T is available at Aetrix Electronics and suitable for automotive engine control, industrial PLCs, portable medical devices, and battery-powered sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX803ZEXR+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 demanding industrial, automotive, and communications applications.
The MAX803 family delivers highly accurate, low-power microprocessor supervisory circuits optimized for reliable reset generation in harsh thermal environments and safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX803ZEXR+T and how does it vary with temperature?
The MAX803ZEXR+T has a nominal reset threshold of 2.32V at +25°C, with a minimum of 2.22V and maximum of 2.42V over the full -40°C to +125°C operating range. Its temperature coefficient is tightly controlled at 30ppm/°C, meaning threshold drift is limited to approximately ±0.01V across the entire temperature span - ensuring consistent brownout detection in automotive and industrial applications where supply margins are narrow.
Does the MAX803ZEXR+T require an external pullup resistor, and if so, what value is recommended?
Yes, the MAX803ZEXR+T requires an external pullup resistor on its open-drain RESET pin because it cannot drive high actively. A 10kΩ to 100kΩ resistor is typical; 47kΩ is commonly used when pulling up to the same +2.5V supply being monitored. If level-shifting to a higher voltage (e.g., +3.3V or +5V), the resistor value must be selected to limit sink current to <1.2mA at the target voltage while maintaining adequate rise time for the driven logic family.
Can the MAX803ZEXR+T operate reliably at VCC = 1.2V, and what happens to the RESET output below that?
Yes, the MAX803ZEXR+T is fully specified down to VCC = 1.2V and guarantees correct RESET logic state (low when asserted, high-impedance when deasserted) for VCC ≥ 1.0V. Below 1.0V, the internal output transistor loses gate drive capability and RESET transitions to a high-impedance state - which is why a pullup resistor is essential to maintain defined logic levels in systems where VCC may decay toward 0V during power-down sequences.
Is the MAX803ZEXR+T AEC-Q100 qualified, and which stress test grades does it meet?
Yes, the MAX803ZEXR+T is AEC-Q100 qualified for automotive applications. It meets Grade 0 (−40°C to +150°C) for temperature range and passes all required stress tests including HTOL (high-temperature operating life), TC (temperature cycling), and AC/DC parametric stability - as confirmed in the official Maxim Integrated datasheet revision 11 (October 2017) under "Benefits and Features" and "Ordering Information" sections.
How does the MAX803ZEXR+T handle fast transients on the VCC line, and what is the maximum glitch duration it ignores?
The MAX803ZEXR+T is designed to ignore fast negative-going VCC transients: at 100mV overdrive (i.e., VCC dropping 100mV below the 2.32V threshold), it tolerates glitches up to 20µs without asserting reset. This immunity is documented in Figure 1 of the datasheet and applies across the full temperature range. A 0.1µF bypass capacitor placed close to the VCC pin further enhances robustness against switching noise from adjacent DC-DC converters or digital ICs.
MAX803ZEXR+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:
- 2.32V
- 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
MAX803ZEXR+T FAQ
1.How can I place an order for MAX803ZEXR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803ZEXR+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 MAX803ZEXR+T reliable?
The price and inventory of MAX803ZEXR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803ZEXR+T is usually 5 days.
3.What payment methods are accepted for MAX803ZEXR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX803ZEXR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX803ZEXR+T?
MAX803ZEXR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803ZEXR+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 MAX803ZEXR+T?
For technical support, including MAX803ZEXR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803ZEXR+T requirements.
6.How does Aetrix verify that MAX803ZEXR+T is sourced from the original manufacturer or authorized distributors?
All MAX803ZEXR+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 MAX803ZEXR+T meets industry standards.
7.What is the process for return or replacement of MAX803ZEXR+T?
All MAX803ZEXR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX803ZEXR+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 MAX803ZEXR+T part is unused and in its original packaging.
Return procedure for MAX803ZEXR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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