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Analog Devices Inc./Maxim Integrated MAX803LEXR-T
- Part No.:
- MAX803LEXR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX803LEXR-T.pdf
- Description:
- IC SUPERVISOR MAX803 3PIN MPU
- Quantity:
- Payment:
- Shipping:
Inventory:72,739
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Product details
Overview
MAX803LEXR-T from Maxim Integrated is a precision microprocessor supervisory circuit with open-drain active-low RESET output, designed for +5V systems requiring reliable power-on and brownout reset assertion. It features a 4.63V reset threshold (±2.5% over −40°C to +125°C), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = 1V. It is used in automotive ECUs and industrial controllers where high-temperature stability and transient immunity are critical.
For engineers reviewing the MAX803LEXR-T datasheet, MAX803LEXR-T pinout, MAX803LEXR-T application, or MAX803LEXR-T equivalent, this page delivers verified electrical parameters, SC70-3 package details, reset timing behavior under temperature variation, and validated alternatives for AEC-Q100-compliant designs.
Technical Context
The MAX803LEXR-T implements a precision bandgap-based voltage comparator monitoring VCC against a factory-trimmed 4.63V threshold, with ±30ppm/°C tempco and guaranteed accuracy across −40°C to +125°C. Its open-drain RESET output requires an external pullup and supports level-shifting-enabling interface with higher-voltage logic or bidirectional μP reset pins.
Reset assertion is held for ≥140ms after VCC rises above threshold, with timeout extended up to 460ms at high temperature. The device ignores transients ≤20μs (for 100mV overdrive) and maintains valid RESET state down to VCC = 1V, ensuring deterministic behavior during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% (−40°C to +125°C); ensures reset triggers before +5V supply drops below 4.5V nominal system margin. |
| Reset Timeout | ≥140ms min after VCC rise; guarantees full μP initialization before release, even under slow-rising supplies. |
| Supply Current | 12μA typical at +25°C; enables multi-year battery life in always-on automotive sensors and portable instrumentation. |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep undervoltage while maintaining reset assertion integrity down to 1V. |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration, level-shifting, and direct interface with bidirectional μP reset I/O. |
| Temperature Range | −40°C to +125°C; qualified per AEC-Q100 Grade 0, suitable for under-hood automotive and industrial control environments. |
| Package | 3-pin SC70 (X3+2); 1.25mm × 0.85mm footprint with 0.65mm pitch-optimized for space-constrained PCB layouts. |
Pinout & Package
MAX803LEXR-T is housed in a 3-pin SC70 package (package code X3+2), with exposed pad not electrically connected. The compact 1.25mm × 0.85mm outline supports high-density routing and automated assembly.
| 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 when asserted (low); requires external pullup resistor (typically 10–100kΩ) to defined logic-high voltage. |
| 3 - VCC | Supply input | Monitored power rail; powers internal circuitry and sets reset threshold reference-no external decoupling required beyond standard 0.1μF. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V threshold | ±2.5% tolerance over full −40°C to +125°C range ensures consistent reset point across automotive thermal cycles. |
| 140ms minimum reset timeout | Guaranteed hold time eliminates race conditions during slow-rising +5V rails in engine control modules. |
| Open-drain RESET with level-shift capability | Enables single-supervisor reset distribution across mixed-voltage domains (e.g., 3.3V μP controlled by 5V monitored rail). |
| Valid RESET down to VCC = 1V | Prevents undefined logic states during deep brownout-critical for fail-safe shutdown sequencing in safety-critical systems. |
| AEC-Q100 Grade 0 qualification | Validated for automotive under-hood applications including transmission control units and body electronics. |
Applications
| Engine Control Unit (ECU) | Industrial PLC CPU Module |
|---|---|
Use Scenario: Monitors main 5V supply in diesel ECU during cold cranking, where battery sag causes repeated 4.2–4.8V excursions. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 core until stable 5V is confirmed. Use Value: Prevents corrupted flash writes and erratic CAN message transmission during marginal supply conditions. |
Use Scenario: Ensures deterministic startup of dual-core RISC processor in modular I/O controller subjected to 48V field wiring transients. IC Role / Device Role / Timing Role: Primary reset source holding CPU in reset for ≥140ms post-power-up, synchronized with FPGA configuration. Use Value: Eliminates need for discrete RC reset networks-reducing BOM count and improving long-term timing stability. |
| Automotive ADAS Camera Module | Portable Medical Infusion Pump |
Use Scenario: Powers vision processor and MIPI CSI-2 serializer from isolated 5V rail; subject to load-dump and reverse-battery stress. IC Role / Device Role / Timing Role: Reset supervisor with transient-immune comparator, asserting RESET during 100mV VCC dips lasting ≤20μs. Use Value: Maintains camera boot integrity without false resets during electromagnetic interference from nearby solenoid drivers. |
Use Scenario: Battery-powered infusion pump operating on Li-ion (3.0–4.2V) with buck-boost regulator generating stable 5V for MCU and motor driver. IC Role / Device Role / Timing Role: Low-current (12μA) reset monitor enabling >5-year shelf life and accurate brownout detection at end-of-battery discharge. Use Value: Guarantees safe motor stop and alarm activation when 5V rail collapses below 4.5V-meeting IEC 60601-1 safety requirements. |
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; no external pullup required; same 4.63V threshold and SC70 package. | Preferred where board space prohibits adding pullup resistor or where RESET loading must be minimized. | Select MAX809LEXR-T if system uses only +5V logic and does not require level-shifting or wired-OR reset bus. |
| TPS3808G125DBVR | 4.63V threshold, push-pull output, 1.6μA quiescent current, but rated only to +105°C (not AEC-Q100). | Suitable for commercial/industrial controllers but not automotive under-hood deployment. | Choose TPS3808G125DBVR only for cost-sensitive non-automotive applications needing ultra-low ICC. |
Compared with MAX803LEXR-T, MAX809LEXR-T simplifies layout by eliminating the pullup resistor yet sacrifices level-shifting flexibility; TPS3808G125DBVR offers lower current but lacks automotive qualification and open-drain versatility-making MAX803LEXR-T the sole choice for AEC-Q100-compliant, multi-rail reset architectures.
Availability
MAX803LEXR-T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX803LEXR-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 communications markets-with emphasis on reliability, integration, and AEC-Q100 compliance.
The MAX803 family delivers highly accurate, low-power supervisory circuits targeting automotive and industrial applications where deterministic reset behavior under extreme thermal and supply-voltage stress is mandatory.
FAQ
What is the reset threshold voltage of the MAX803LEXR-T and how stable is it over temperature?
The MAX803LEXR-T has a factory-trimmed reset threshold of 4.63V with ±2.5% tolerance over −40°C to +125°C. Its temperature coefficient is 30ppm/°C, meaning threshold drift is limited to ±0.014V across the full range-ensuring predictable reset timing in engine control and industrial automation applications where supply margins are tight.
Does the MAX803LEXR-T require an external pullup resistor, and what value is recommended?
Yes, the MAX803LEXR-T features an open-drain RESET output and requires an external pullup resistor. A 10kΩ to 100kΩ resistor connected to the target logic rail (e.g., 3.3V or 5V) is recommended. Lower values improve noise immunity but increase current draw; higher values reduce power but may slow edge rates-10kΩ is optimal for most automotive and industrial interfaces using the MAX803LEXR-T.
Can the MAX803LEXR-T operate reliably when VCC drops below 1.2V?
The MAX803LEXR-T is fully specified down to VCC = 1.2V over temperature, and its RESET output remains valid (asserted low) down to VCC = 1V. Below 1V, the output transitions to high-impedance-but since most μPs are nonfunctional below 1V, this behavior is intentional and documented in the datasheet. The MAX803LEXR-T does not guarantee operation below 1.2V, and VCC < 1.2V is outside absolute maximum ratings.
Is the MAX803LEXR-T pin-compatible with other members of the MAX803/MAX809/MAX810 family?
No-while all share the same SC70-3 package footprint and pinout (GND, RESET, VCC), the MAX803LEXR-T has an open-drain output, whereas MAX809LEXR-T and MAX810LEXR-T use push-pull outputs. Swapping them without circuit modification risks incorrect logic levels or excessive current draw. The MAX803LEXR-T is functionally distinct and must be selected based on required output topology-not as a drop-in replacement.
What automotive qualification does the MAX803LEXR-T meet, and which test grades apply?
The MAX803LEXR-T is AEC-Q100 qualified per Grade 0 (−40°C to +125°C ambient), with full testing including HTOL, ESD, latch-up, and temperature cycling. It carries the "/V+" suffix denoting automotive qualification, and its SC70 package meets lead-free RoHS requirements. This makes the MAX803LEXR-T suitable for powertrain, chassis, and ADAS applications where extended temperature operation and long-term reliability are mandated.
MAX803LEXR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- 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-T FAQ
1.How can I place an order for MAX803LEXR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX803LEXR-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 MAX803LEXR-T reliable?
The price and inventory of MAX803LEXR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX803LEXR-T is usually 5 days.
3.What payment methods are accepted for MAX803LEXR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX803LEXR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX803LEXR-T?
MAX803LEXR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX803LEXR-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 MAX803LEXR-T?
For technical support, including MAX803LEXR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX803LEXR-T requirements.
6.How does Aetrix verify that MAX803LEXR-T is sourced from the original manufacturer or authorized distributors?
All MAX803LEXR-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 MAX803LEXR-T meets industry standards.
7.What is the process for return or replacement of MAX803LEXR-T?
All MAX803LEXR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX803LEXR-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 MAX803LEXR-T part is unused and in its original packaging.
Return procedure for MAX803LEXR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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