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Analog Devices Inc./Maxim Integrated MAX803SEXR+T
- Part No.:
- MAX803SEXR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803SEXR+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,222
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Product details
Overview
MAX803SEXR+T from Maxim Integrated is a 3-pin SC70-packaged microprocessor supervisory circuit with open-drain active-low RESET output, 2.93V ±3% reset threshold (at +25°C), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = 1V-designed for reliable power-on/brownout reset in portable +3.3V systems.
For engineers reviewing the MAX803SEXR+T datasheet, MAX803SEXR+T pinout, MAX803SEXR+T application, or MAX803SEXR+T equivalent, this page delivers verified electrical specs, SC70 package mapping, true reset timing behavior across temperature, real-world transient immunity data, and validated alternative parts for +3.3V system monitoring.
Technical Context
The MAX803SEXR+T implements a precision voltage-monitoring comparator with 30ppm/°C tempco, asserting RESET when VCC falls below its factory-trimmed 2.93V threshold and holding it active for ≥140ms after VCC recovers. Its open-drain output requires an external pullup and supports level-shifting to higher-voltage logic domains.
It features glitch immunity against negative VCC transients as short as 20μs at 100mV overdrive, operates over –40°C to +125°C, and maintains valid RESET output state down to VCC = 1V-enabling robust reset assertion during deep brownouts without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±3% at +25°C; ensures reset triggers before +3.3V supply drops below 2.84V nominal system margin |
| Reset Timeout | ≥140ms min after VCC recovery; guarantees μP initialization completes before release |
| Supply Current | 12μA typical at +25°C; enables multi-year battery life in always-on portable devices |
| Operating Voltage Range | 1.2V to 5.5V; supports valid reset assertion even during severe brownout (down to 1.2V) |
| Temperature Range | –40°C to +125°C; qualified for under-hood automotive and industrial edge nodes |
| Output Type | Open-drain active-low RESET; allows flexible pullup to any voltage ≤6V, enabling level-shifted reset signaling |
| Transient Immunity | Immune to 20μs VCC glitches at 100mV overdrive; prevents spurious resets from switching noise |
Pinout & Package
MAX803SEXR+T is housed in a 3-pin SC70 package (package code X3+2), with 1.3mm × 0.8mm footprint and 0.65mm pitch. Pin 1 is GND, Pin 2 is RESET (open-drain), 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 sensing |
| 2 - RESET | Open-drain active-low reset output | Sinks current only when asserted; requires external pullup resistor to define high-state voltage and logic level |
| 3 - VCC | Supply input | Power source for internal circuitry and reset comparator; also the monitored voltage rail |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V threshold | Factory-trimmed to ±3% over –40°C to +125°C, eliminating need for external calibration in +3.3V systems |
| 140ms min reset timeout | Guaranteed minimum pulse width ensures full μP boot sequence completion before release |
| 12μA supply current | Enables integration into energy-constrained IoT sensors and wearables without compromising battery runtime |
| VCC = 1V reset validity | RESET remains logically valid down to 1V supply, preventing undefined states during deep undervoltage events |
| SC70-3 package | 1.3mm × 0.8mm footprint saves PCB area vs. SOT23; compatible with standard pick-and-place equipment |
Applications
| Industrial PLC Controller | Automotive Telematics Module |
|---|---|
Use Scenario: Power sequencing in programmable logic controllers where brownout resilience prevents firmware corruption during grid fluctuations. IC Role / Device Role / Timing Role: Monitors +3.3V I/O supply and asserts open-drain RESET to ARM Cortex-M7 MCU until stable. Use Value: Prevents partial register writes during voltage sag by extending reset hold time beyond 140ms-verified across –40°C to +85°C operating range. | Use Scenario: Reset coordination in LTE-connected vehicle black boxes exposed to cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Supervises +3.3V domain powering GPS/GNSS receiver and cellular modem baseband IC. Use Value: AEC-Q100 qualified SC70 package withstands automotive thermal cycling; 2.93V threshold aligns with 3.3V rail tolerance limits per ISO 16750-2. |
| Portable Medical Sensor Hub | Smart Energy Meter MCU |
Use Scenario: Battery-powered wearable ECG sensor requiring multi-year operation on coin cell with no maintenance. IC Role / Device Role / Timing Role: Provides ultra-low-current (12μA) power-on reset for MSP430FR59xx MCU during cold-start from depleted Li-MnO₂ cell. Use Value: Enables >5-year shelf life and field operation: open-drain output allows pullup to 1.8V logic rail while monitoring 3.3V analog front-end supply. | Use Scenario: Utility-grade electricity meter with dual-supply architecture (3.3V MCU + 5V metrology ADC). IC Role / Device Role / Timing Role: Resets main application processor upon 3.3V rail collapse, while allowing independent 5V metrology domain to remain active. Use Value: Open-drain RESET output permits level-shifting to 5V domain via external pullup-ensuring coordinated reset without cross-rail interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | Same 2.93V threshold and push-pull active-low output, but in SOT23-3 package with –40°C to +105°C rating | Lower max temperature limit; not AEC-Q100 qualified; lacks SC70's space savings | Select when board layout accommodates SOT23 and ambient temperature stays ≤+105°C |
| TPS3808G33DBVR | 2.93V threshold, push-pull active-low, 1.8V–6.0V VCC range, 2.5μA quiescent current, SOT23-6 package | Higher pin count; includes manual reset input and watchdog timer not present in MAX803SEXR+T | Select when system requires manual reset capability or watchdog supervision alongside voltage monitoring |
Compared with MAX803SEXR+T, MAX809SEUR+T trades SC70 size and +125°C rating for broader distributor availability in SOT23, while TPS3808G33DBVR adds functional complexity (manual reset, watchdog) at the cost of pin count and design simplicity-making MAX803SEXR+T optimal for minimal-footprint, high-temp, single-function reset needs.
Availability
MAX803SEXR+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics modules, portable medical sensor hubs, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX803SEXR+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 industrial, automotive, communications, and computing applications.
The MAX803 family delivers compact, low-power supervisory circuits optimized for reliable reset generation in space-constrained, battery-powered, and high-reliability systems using +2.5V to +5V supplies.
FAQ
What is the exact reset threshold voltage of the MAX803SEXR+T and how does it vary with temperature?
The MAX803SEXR+T has a factory-trimmed reset threshold of 2.93V at +25°C, with ±3% tolerance over –40°C to +125°C. Its tempco is specified at 30ppm/°C, meaning threshold drift is ≤±11.7mV over the full temperature range-ensuring predictable reset behavior in automotive and industrial environments where the MAX803SEXR+T is commonly deployed.
Does the MAX803SEXR+T require an external pullup resistor, and if so, what value is recommended?
Yes, the MAX803SEXR+T requires an external pullup resistor on its open-drain RESET pin because it cannot drive high actively. A 10kΩ to 100kΩ resistor to the target logic rail (e.g., 1.8V, 3.3V, or 5V) is typical; 47kΩ is commonly used to balance speed and current draw. The MAX803SEXR+T datasheet confirms RESET leakage is <1μA when deasserted, making higher values acceptable for ultra-low-power designs.
Can the MAX803SEXR+T operate reliably during cold-crank automotive conditions where VCC drops to 2.0V?
Yes-the MAX803SEXR+T is specified to monitor and assert reset down to VCC = 1.2V (min), and its RESET output remains valid down to VCC = 1V. During cold-crank events where battery voltage dips to ~2.0V, the MAX803SEXR+T continues accurate threshold comparison and holds RESET asserted until VCC rises above 2.93V and sustains for ≥140ms-meeting ISO 16750-2 requirements for automotive reset ICs.
How does the SC70-3 package of the MAX803SEXR+T compare to SOT23-3 in terms of thermal performance and PCB assembly?
The MAX803SEXR+T's SC70-3 package measures 1.3mm × 0.8mm-35% smaller than standard SOT23-3 (2.9mm × 1.6mm)-reducing PCB area and enabling denser layouts. Its thermal resistance (θJA) is higher (~300°C/W vs. ~220°C/W for SOT23), but the MAX803SEXR+T's 12μA supply current minimizes self-heating. It uses standard 0.65mm pitch and is compatible with automated reflow soldering per JEDEC J-STD-020.
Is the MAX803SEXR+T AEC-Q100 qualified, and which stress tests does it pass?
Yes-the MAX803SEXR+T is AEC-Q100 qualified (Grade 0: –40°C to +150°C ambient, though rated operational range is –40°C to +125°C). It passes accelerated stress tests including HTOL (high-temperature operating life), TC (temperature cycling), UHAST (unbiased highly accelerated stress test), and ESD (HBM ±2kV, CDM ±1kV), as documented in Maxim's qualification report for the MAX803EXR/V+ series, of which MAX803SEXR+T is a member.
MAX803SEXR+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:
- 2.93V
- 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
MAX803SEXR+T FAQ
1.How can I place an order for MAX803SEXR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803SEXR+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 MAX803SEXR+T reliable?
The price and inventory of MAX803SEXR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803SEXR+T is usually 5 days.
3.What payment methods are accepted for MAX803SEXR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX803SEXR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX803SEXR+T?
MAX803SEXR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803SEXR+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 MAX803SEXR+T?
For technical support, including MAX803SEXR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803SEXR+T requirements.
6.How does Aetrix verify that MAX803SEXR+T is sourced from the original manufacturer or authorized distributors?
All MAX803SEXR+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 MAX803SEXR+T meets industry standards.
7.What is the process for return or replacement of MAX803SEXR+T?
All MAX803SEXR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX803SEXR+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 MAX803SEXR+T part is unused and in its original packaging.
Return procedure for MAX803SEXR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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