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Analog Devices Inc./Maxim Integrated MAX803LEXR+T10
- Part No.:
- MAX803LEXR+T10
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803LEXR+T10.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,145
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Product details
Overview
MAX803LEXR+T10 from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with open-drain active-low RESET output, designed to monitor +5V power supplies. It asserts reset when VCC falls below 4.63V (±30mV), holds reset for ≥140ms after VCC recovers, operates from VCC = 1.0V to 5.5V, draws only 24–35µA supply current, and guarantees valid reset down to VCC = 1V - used in automotive engine control units for reliable cold-cranking detection.
For engineers reviewing the MAX803LEXR+T10 datasheet, MAX803LEXR+T10 pinout, MAX803LEXR+T10 application, or MAX803LEXR+T10 equivalent, this page delivers verified electrical specs, SC70-3 package details, temperature-stable reset threshold behavior, and real-world design guidance for brownout immunity and multi-supply interfacing.
Technical Context
The MAX803LEXR+T10 implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its 4.63V threshold. Its open-drain RESET output requires an external pullup resistor and supports level-shifting - enabling interface with higher-voltage logic or bidirectional μP reset pins like the Motorola 68HC11.
Reset assertion is immune to transients ≤20µs at 100mV overdrive, and the device remains functional across –40°C to +125°C. It guarantees RESET validity down to VCC = 1V and includes built-in immunity to fast VCC glitches without external filtering beyond a 0.1µF bypass capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±30mV at +25°C; ensures reset triggers before +5V supply drops to 4.56V - critical for stable boot in automotive ECUs. |
| Reset Timeout | ≥140ms minimum after VCC recovery; prevents premature μP release during slow-rising battery-powered startup. |
| Supply Current | 24–35µA (SC70, –40°C to +85°C); enables use in always-on vehicle subsystems without draining standby power. |
| VCC Operating Range | 1.0V to 5.5V; allows valid reset assertion even as battery sags to 1V during cranking - no false releases. |
| Output Type | Open-drain active-low RESET; supports wired-OR configuration and level-shifting to logic supplies up to 6V. |
| Temp Range | –40°C to +125°C; qualified per AEC-Q100 for under-hood automotive deployment. |
| Transient Immunity | Rejects VCC glitches ≤20µs at 100mV overdrive; eliminates spurious resets from alternator noise or load-dump coupling. |
Pinout & Package
MAX803LEXR+T10 is housed in a 3-pin SC70 package (package code X3+2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant matte-tin plating.
| 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 when asserted; requires external pullup (typically 10–100kΩ) to VCC or alternate logic rail up to 6V. |
| 3 - VCC | Supply input | Monitored power rail; powers internal circuitry and sets reset threshold reference - valid from 1.0V to 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V threshold | ±30mV tolerance at +25°C and ±100mV over –40°C to +125°C - eliminates uncertainty zone between 5% and 10% supply drop. |
| Open-drain RESET with level-shift capability | Enables direct interface to 3.3V or 5V μP reset pins while monitoring a separate 5V domain - no level translator IC required. |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset state during deep brownout; avoids floating RESET lines that could cause undefined μP behavior. |
| AEC-Q100 qualified | Validated for automotive applications including engine control, transmission modules, and ADAS sensors requiring Grade 0/1 reliability. |
| No external components needed | Integrates voltage reference, comparator, timer, and output driver - reduces BOM count and PCB area vs. discrete supervisor solutions. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors 5V supply during cold cranking when battery voltage dips to 6–9V with high ripple. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET until VCC stabilizes above 4.56V for ≥140ms. Use Value: Prevents ECU firmware execution during unstable power - avoids corrupted flash writes or sensor misreads. |
Use Scenario: Powers camera and radar processing modules requiring deterministic boot sequencing after ignition-on. IC Role / Device Role / Timing Role: Generates clean, glitch-immune reset pulse synchronized to 5V rail recovery after power-up. Use Value: Eliminates need for RC-based reset circuits prone to temperature drift and component aging. |
| Automotive Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Manages wake-up/reset of LIN gateway and door module microcontrollers from always-on 5V rail. IC Role / Device Role / Timing Role: Open-drain RESET output pulled to 3.3V logic domain, enabling shared reset bus across mixed-voltage subsystems. Use Value: Supports single-point reset coordination without voltage translators - simplifies layout and improves noise margin. |
Use Scenario: Ensures reliable restart after cellular modem power cycling or GPS signal loss-induced brownout. IC Role / Device Role / Timing Role: Provides 140ms minimum timeout with transient immunity to reject alternator switching noise on 5V supply. Use Value: Reduces field returns due to spontaneous reboots caused by electromagnetic interference in vehicle RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809LEXR+T | Push-pull active-low RESET output; same 4.63V threshold and SC70 package; no external pullup required. | Better suited for systems where RESET line drives CMOS inputs directly without level translation or wired-OR requirements. | Select MAX809LEXR+T if board layout lacks space for pullup resistor or if driving high-capacitance reset nets. |
| TLV803E46DBVR | 4.63V threshold, open-drain output, SOT-23 package; 1.8–6V VCC range; 1.8µA typical ICC; –40°C to +125°C. | Lower quiescent current ideal for ultra-low-power telematics sleep modes; different pinout (GND–VCC–RESET) and smaller footprint. | Choose TLV803E46DBVR when minimizing standby current is critical and PCB redesign accommodates SOT-23 layout. |
Compared with MAX803LEXR+T10, MAX809LEXR+T eliminates the pullup resistor but loses level-shifting flexibility, while TLV803E46DBVR cuts supply current by >90% but requires pinout adaptation and offers reduced transient immunity.
Availability
MAX803LEXR+T10 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS sensor modules, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX803LEXR+T10 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 communications markets, emphasizing high-reliability, low-power, and AEC-Q100-qualified solutions.
The MAX803 family delivers cost-effective, single-function power-supply supervision for microprocessors - optimized for deterministic reset timing, wide temperature operation, and minimal external components in safety-critical automotive systems.
FAQ
What is the exact reset threshold voltage of the MAX803LEXR+T10, and how does it vary with temperature?
The MAX803LEXR+T10 has a nominal reset threshold of 4.63V at +25°C, with guaranteed limits of 4.56V (min) to 4.70V (max) at room temperature. Over the full operating range of –40°C to +125°C, the threshold stays within 4.44V to 4.82V, exhibiting a tempco of 30ppm/°C - ensuring predictable brownout detection across automotive thermal environments.
Does the MAX803LEXR+T10 require an external pullup resistor, and what value is recommended?
Yes, the MAX803LEXR+T10 features an open-drain RESET output and requires an external pullup resistor. A value between 10kΩ and 100kΩ is recommended - 47kΩ is commonly used - connected to the target logic rail (e.g., 3.3V or 5V). The resistor enables level-shifting and wired-OR reset bus configurations not possible with push-pull alternatives like the MAX809LEXR+T.
Can the MAX803LEXR+T10 operate reliably during automotive cold cranking when VCC drops below 1V?
The MAX803LEXR+T10 guarantees valid RESET output down to VCC = 1V, but ceases to actively drive the line below that point. At VCC < 1V, RESET becomes high-impedance and may float. For continuous validity to 0V, a 100kΩ pull-down resistor to GND is recommended - a design practice documented in Maxim's application notes for MAX803LEXR+T10 and confirmed in Figure 2 of the official datasheet.
Is the MAX803LEXR+T10 AEC-Q100 qualified, and which grade does it meet?
Yes, the MAX803LEXR+T10 is AEC-Q100 qualified and rated for Grade 0 (–40°C to +125°C ambient), as explicitly stated in the "Benefits and Features" section of the Maxim Integrated datasheet. This qualification covers stress testing for temperature cycling, humidity, ESD, and mechanical shock - confirming suitability for under-hood automotive applications.
How does the MAX803LEXR+T10 handle fast VCC transients, and what is its immunity specification?
The MAX803LEXR+T10 rejects negative-going VCC transients up to 20µs in duration when the overdrive (VTH – VCC) is 100mV, per Figure 1 in the datasheet. This immunity is achieved via internal comparator hysteresis and filtering - eliminating need for additional RC networks. A 0.1µF ceramic capacitor placed close to the VCC pin further enhances robustness against alternator noise and load-dump coupling.
MAX803LEXR+T10 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:
- 4.63V
- 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
MAX803LEXR+T10 FAQ
1.How can I place an order for MAX803LEXR+T10 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803LEXR+T10 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 MAX803LEXR+T10 reliable?
The price and inventory of MAX803LEXR+T10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803LEXR+T10 is usually 5 days.
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4.How is shipping managed for MAX803LEXR+T10?
MAX803LEXR+T10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803LEXR+T10 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 MAX803LEXR+T10?
For technical support, including MAX803LEXR+T10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803LEXR+T10 requirements.
6.How does Aetrix verify that MAX803LEXR+T10 is sourced from the original manufacturer or authorized distributors?
All MAX803LEXR+T10 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 MAX803LEXR+T10 meets industry standards.
7.What is the process for return or replacement of MAX803LEXR+T10?
All MAX803LEXR+T10 units undergo pre-shipment inspection (PSI). If there is an issue with MAX803LEXR+T10, 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 MAX803LEXR+T10 part is unused and in its original packaging.
Return procedure for MAX803LEXR+T10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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