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Analog Devices Inc./Maxim Integrated MAX803MEXR/V+T
- Part No.:
- MAX803MEXR/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803MEXR/V+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,206
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Product details
Overview
MAX803MEXR/V+T from Maxim Integrated is an automotive-grade, open-drain microprocessor supervisory circuit designed to monitor +3.3V power supplies and assert a reset signal during brownout or power-up conditions. It features a 4.38V reset threshold (±1.5% over temperature), 140ms minimum reset timeout, 12μA supply current at +25°C, guaranteed reset validity down to VCC = +1V, and is qualified to AEC-Q100 Grade 0 (−40°C to +125°C). It is used in engine control units and ADAS modules requiring reliable power-on reset.
For engineers reviewing the MAX803MEXR/V+T datasheet, MAX803MEXR/V+T pinout, MAX803MEXR/V+T application, or MAX803MEXR/V+T equivalent, this page delivers verified technical context, package mapping, real-world use scenarios, and validated alternative options for automotive and industrial embedded systems where precise voltage monitoring and extended temperature operation are critical.
Technical Context
The MAX803MEXR/V+T implements a precision bandgap-based reset comparator with 30ppm/°C tempco, ensuring stable threshold accuracy across −40°C to +125°C. Its open-drain RESET output requires an external pullup resistor and supports level-shifting-e.g., asserting reset on a +5V logic rail while powered from a +3.3V supply.
Reset assertion occurs when VCC falls below 4.38V and remains active for ≥140ms after VCC rises above threshold. The device ignores transients ≤20μs (at 100mV overdrive) and guarantees correct logic state down to VCC = +1V, enabling robust operation during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±1.5% (guaranteed over −40°C to +125°C; enables reliable detection of +3.3V supply droop) |
| Reset Timeout | ≥140ms (ensures μP completes full initialization before release) |
| Supply Current | 17–60μA (varies with temperature; enables battery longevity in always-on automotive modules) |
| VCC Operating Range | 1.2V to 5.5V (supports valid reset assertion even during severe undervoltage) |
| Output Type | Open-drain RESET (allows flexible pullup voltage selection up to +6V; enables level-shifting and bidirectional reset I/O) |
| Temperature Range | −40°C to +125°C (AEC-Q100 Grade 0 qualified; suitable for under-hood ECUs) |
| Package | 3-pin SC70 (1.25mm × 0.85mm footprint; space-constrained automotive PCBs) |
Pinout & Package
The MAX803MEXR/V+T is housed in a 3-pin SC70 package (package code X3+2), with 0.65mm pitch and exposed pad not present. Pin 1 is GND, Pin 2 is RESET (open-drain), and Pin 3 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for internal biasing and reset comparator; must be low-impedance to ensure noise immunity |
| RESET (Pin 2) | Open-drain reset output | Sinks current when asserted; requires external pullup to define high-level voltage (e.g., +5V, +3.3V, or higher); supports bidirectional reset interfaces |
| VCC (Pin 3) | Supply input | Power source for internal circuitry; also monitored for reset generation; accepts 1.2V–5.5V with full functionality |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.38V threshold | ±1.5% tolerance over full temperature range ensures deterministic reset timing without margin stacking |
| 140ms minimum reset pulse | Guarantees μP core and peripherals fully stabilize before release-no external RC timing required |
| Open-drain RESET with 1μA leakage | Enables interface to mixed-voltage systems and eliminates contention on shared reset buses |
| AEC-Q100 Grade 0 qualification | Validated for automotive under-hood environments including thermal cycling, humidity, and vibration stress |
| 12μA typical ICC at +25°C | Reduces quiescent load on always-on vehicle batteries-critical for ECU sleep-mode compliance |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors main +3.3V domain powering MCU, CAN transceivers, and sensor signal conditioners during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to prevent corrupted firmware execution during supply sag. Use Value: Guarantees reset remains asserted until VCC recovers to ≥4.38V and holds for ≥140ms-eliminating boot failures in transient-rich automotive electrical systems. | Use Scenario: Provides power-on reset for vision processing SoCs in camera modules mounted behind rearview mirrors. IC Role / Device Role / Timing Role: Open-drain RESET pulled to +5V logic rail, enabling clean reset coordination between 3.3V-powered image sensor and 5V-powered ISP. Use Value: Level-shifting capability avoids additional level translators; AEC-Q100 qualification ensures reliability across −40°C to +125°C ambient. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Supervises +3.3V supply feeding LIN transceivers and EEPROM in door module electronics. IC Role / Device Role / Timing Role: Resets microcontroller upon battery disconnect/reconnect to prevent bus arbitration errors. Use Value: Valid reset output down to VCC = +1V ensures deterministic behavior during slow discharge-no floating reset line or spurious wakeups. | Use Scenario: Generates power-on reset for application processor and audio codec during ignition-on sequence. IC Role / Device Role / Timing Role: Reset supervisor with 140ms timeout synchronized to PMIC sequencing delays. Use Value: Matches typical SoC reset hold time requirements; SC70 footprint saves board area in dense multi-layer head unit PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809MEXR/V+T | Push-pull active-low RESET output; same 4.38V threshold and AEC-Q100 Grade 0 rating | Eliminates need for external pullup resistor but cannot level-shift or interface with bidirectional reset pins | Select when board layout prohibits external components and reset rail matches VCC voltage |
| TLV803MDBZR | 4.38V threshold, open-drain, SOT23-3 package, −40°C to +125°C, but not AEC-Q100 qualified | Lacks automotive qualification; lower max operating temperature derating (320mW vs. 174mW SC70) | Select for cost-sensitive industrial applications where AEC-Q100 is not mandated |
Compared with MAX803MEXR/V+T, MAX809MEXR/V+T removes external component count but sacrifices level-shifting flexibility, while TLV803MDBZR offers identical electrical specs in a larger package without automotive validation-making MAX803MEXR/V+T the only choice for space-constrained, AEC-Q100-compliant +3.3V reset supervision.
Availability
MAX803MEXR/V+T is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, body control modules, and infotainment head units requiring stable component supply across automotive production lifecycles.
Supply support for MAX803MEXR/V+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 high-performance analog and mixed-signal semiconductor solutions for automotive, industrial, and communications markets.
The MAX803 family delivers precision, low-power microprocessor supervisory circuits optimized for automotive-grade reliability and compact packaging-specifically targeting reset-critical subsystems in harsh-environment electronic control units.
FAQ
What is the reset threshold voltage of the MAX803MEXR/V+T and how tightly is it specified?
The MAX803MEXR/V+T has a nominal reset threshold of 4.38V, with a guaranteed tolerance of ±1.5% over the full operating temperature range of −40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet (Rev 11, 10/17), where VTH min/max values are explicitly listed for MAX8__M variants in SC70 packages across temperature extremes. The tight tolerance ensures predictable reset behavior without design margin stacking in automotive power domains.
Does the MAX803MEXR/V+T require an external pullup resistor, and why?
Yes, the MAX803MEXR/V+T requires an external pullup resistor on its open-drain RESET pin because its output stage lacks an internal pullup. This design allows the RESET signal to be pulled to any voltage up to +6V-including rails higher than VCC-enabling level-shifting and compatibility with bidirectional reset interfaces like those found in Motorola 68HC11 microcontrollers. The datasheet specifies RESET leakage <1μA when deasserted, confirming minimal loading on the pullup network.
Is the MAX803MEXR/V+T qualified for automotive applications, and what does the "/V+" suffix indicate?
Yes, the MAX803MEXR/V+T is AEC-Q100 qualified for automotive use, specifically Grade 0 (−40°C to +125°C). The "/V+" suffix denotes Maxim's automotive qualification marking: "/V" indicates AEC-Q100 compliance, and "+" signifies lead-free/RoHS-compliant packaging. This is documented in the Ordering Information section (page 7) and Benefits and Features list, which explicitly states "AEC-Q100 Qualified" for /V versions.
What is the minimum reset timeout duration of the MAX803MEXR/V+T, and is it guaranteed over temperature?
The MAX803MEXR/V+T guarantees a minimum reset timeout of 140ms after VCC rises above the reset threshold. This parameter is fully specified over temperature: for SC70 packages, the timeout remains ≥140ms across −40°C to +85°C and ≥100ms from +85°C to +125°C, as shown in the "Reset Active Timeout Period (SC70)" row of the Electrical Characteristics table. No external timing components are needed to achieve this guarantee.
Can the MAX803MEXR/V+T operate reliably when VCC drops below 1V, and what happens to the RESET output?
The MAX803MEXR/V+T guarantees correct RESET logic state down to VCC = +1V, but below that, the output behavior is not specified. As VCC falls below 1V, the internal output transistor loses drive strength, and RESET transitions toward a high-impedance state. While the datasheet notes that most μPs are nonfunctional below 1V, applications requiring valid RESET down to 0V must add an external pull-down resistor (e.g., 100kΩ to GND) to prevent floating-this guidance appears in the Applications Information section under "Ensuring a Valid Reset Output Down to VCC = 0V".
MAX803MEXR/V+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX803MEXR/V+T FAQ
1.How can I place an order for MAX803MEXR/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803MEXR/V+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 MAX803MEXR/V+T reliable?
The price and inventory of MAX803MEXR/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803MEXR/V+T is usually 5 days.
3.What payment methods are accepted for MAX803MEXR/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX803MEXR/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX803MEXR/V+T?
MAX803MEXR/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803MEXR/V+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 MAX803MEXR/V+T?
For technical support, including MAX803MEXR/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803MEXR/V+T requirements.
6.How does Aetrix verify that MAX803MEXR/V+T is sourced from the original manufacturer or authorized distributors?
All MAX803MEXR/V+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 MAX803MEXR/V+T meets industry standards.
7.What is the process for return or replacement of MAX803MEXR/V+T?
All MAX803MEXR/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX803MEXR/V+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 MAX803MEXR/V+T part is unused and in its original packaging.
Return procedure for MAX803MEXR/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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