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Analog Devices Inc./Maxim Integrated MAX6803US31D3
- Part No.:
- MAX6803US31D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6803US31D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
MAX6803US31D3 from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit in 4-pin SOT143 packaging, designed for precise power-on reset generation with 3.08V factory-trimmed threshold and 100ms minimum timeout period. It monitors VCC from 0.7V to 5.5V, delivers 4µA supply current at 3V, and asserts RESET high during brownout or manual reset, supporting critical µP/µC power monitoring in portable and industrial systems.
For engineers reviewing the MAX6803US31D3 datasheet, MAX6803US31D3 pinout, MAX6803US31D3 application, or MAX6803US31D3 equivalent, key selection criteria include its active-high push/pull output, guaranteed reset validity down to VCC = 0.7V, 3.08V ±3% threshold tolerance over -40°C to +125°C, and compatibility with space-constrained embedded designs requiring deterministic reset timing.
Technical Context
The MAX6803US31D3 implements a precision bandgap-based voltage comparator with factory-trimmed 3.08V threshold (±1.8% at +25°C, ±3% over full temperature range) and internal 100ms reset timeout timer. Its push/pull output drives high during reset assertion and sinks current when deasserted, enabling direct interface with high-impedance µP reset inputs without external pullup.
It features a debounced manual-reset input (MR) with 20kΩ internal pullup, 1µs minimum MR pulse width, and immunity to VCC transients ≤30µs at 10V/ms slew rate. The device operates across -40°C to +125°C and maintains functional reset state down to VCC = 0.7V, ensuring robust behavior during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% over -40°C to +125°C - ensures reliable detection of 3.3V supply brownout before µP malfunction |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for complete µP initialization after power stabilization |
| Supply Current | 4µA at VCC = 3.0V - enables ultra-low-power operation in battery-backed or energy-sensitive systems |
| Operating Voltage Range | 0.7V to 5.5V - supports valid reset assertion even during severe undervoltage events |
| Output Type | Push/pull active-high - eliminates need for external pullup resistor and simplifies µP reset pin interface |
| VCC Transient Immunity | Rejects negative-going glitches ≤30µs at 10V/ms - prevents spurious resets from power rail noise |
| MR Input Characteristics | Internal 20kΩ pullup, 0.3×VCC low threshold - allows direct switch-to-GND connection with no external components |
Pinout & Package
MAX6803US31D3 is housed in a 4-pin SOT143 package (outline U4-1), measuring 2.9mm × 1.6mm × 1.1mm, optimized for space-constrained PCB layouts. Pin 1 is GND, Pin 2 is RESET (active-high push/pull), Pin 3 is MR (manual reset input), and Pin 4 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-high reset output | Drives high during reset assertion (VCC < 3.08V or MR low); sources up to 800µA at VCC ≥ 4.25V |
| 3 (MR) | Manual reset input | Logic-low assertion triggers reset; internal 20kΩ pullup enables NC or direct switch-to-GND use |
| 4 (VCC) | Supply voltage input | Accepts 0.7V–5.5V; powers internal comparator, timer, and output stage; absolute max = +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.08V threshold | Enables precise brownout detection for 3.3V systems without calibration or external resistors |
| 100ms minimum reset timeout | Guarantees µP reset hold time exceeds typical boot ROM execution latency in embedded controllers |
| 0.7V operating minimum | Ensures reset remains asserted through deep brownout until VCC recovers above functional µP level |
| Debounced MR input with 20kΩ pullup | Eliminates need for external RC filter or logic gate, reducing BOM count and board area |
| Push/pull active-high output | Simplifies interface with µPs requiring high-active reset (e.g., certain ARM Cortex-M variants) |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose monitor with low-power µC that must retain calibration data during intermittent coin-cell discharge. IC Role / Device Role / Timing Role: Power supervisor asserting active-high RESET to halt µC execution and preserve SRAM state during VCC drop below 3.08V. Use Value: 4µA quiescent current extends battery life; 100ms timeout ensures EEPROM write completion before power loss. |
Use Scenario: DIN-rail mounted analog input module exposed to 24VDC supply fluctuations in factory environments. IC Role / Device Role / Timing Role: Brownout detector generating clean, glitch-immune reset signal to prevent firmware corruption during line sags. Use Value: 30µs transient immunity rejects EMI-induced noise; -40°C to +125°C rating ensures reliability in uncontrolled enclosures. |
| Smart Energy Meters | Automotive Body Control Units |
|
Use Scenario: ANSI C12.20-compliant electricity meter with dual-supply (3.3V logic, 5V RTC) requiring synchronized reset on main rail failure. IC Role / Device Role / Timing Role: Primary VCC supervisor triggering system-wide reset when 3.3V rail falls below 3.08V, coordinating with backup power switchover. Use Value: Push/pull output directly drives µP reset pin without pullup, reducing component count and improving noise margin. |
Use Scenario: 12V automotive subsystem (e.g., seat control) powered via LDO with transient-rich supply from vehicle battery. IC Role / Device Role / Timing Role: Reset generator immune to load-dump spikes and cranking dips, holding µC in reset until stable 3.3V is established. Use Value: Valid reset assertion down to 0.7V prevents partial execution during cold-cranking; SOT143 footprint fits tight under-hood layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US31D3-T | Same 3.08V threshold and 100ms timeout, but uses different BiCMOS process with 5µA ICC (vs. 4µA) and ±2.5% threshold tolerance | Valid for identical 3.3V brownout detection, but slightly higher supply current reduces battery life in portable use | Select when legacy qualification or alternate sourcing is required; not pin-compatible due to different pin 2 function (open-drain vs. push/pull) |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V), 200ms timeout, 1.6µA ICC, open-drain output - requires external pullup | Designed for 3.3V nominal systems with longer reset hold; lacks MR input and operates down to 0.9V only | Choose for ultra-low-power applications where 3.3V threshold suffices and MR functionality is unnecessary |
Compared with MAX6803US31D3, MAX6314US31D3 offers similar timing and threshold but requires layout revision due to output structure mismatch, while TPS3808G33DBVR trades MR support and brownout sensitivity for lower current and longer timeout - neither is a drop-in replacement.
Availability
MAX6803US31D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6803US31D3 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 markets, emphasizing reliability and integration.
The MAX6803 series targets space- and power-constrained embedded systems needing deterministic, low-component-count reset supervision - specifically engineered for µP/µC power monitoring with factory-trimmed thresholds and guaranteed sub-1V operation.
FAQ
What is the exact reset threshold voltage of MAX6803US31D3 and how tightly is it specified?
The MAX6803US31D3 has a factory-trimmed reset threshold of 3.08V, specified as ±1.8% at +25°C and ±3% over the full -40°C to +125°C operating temperature range. This precision enables reliable detection of 3.3V supply brownout without external calibration, and the value is confirmed in Table 1 of the official datasheet with suffix "31" corresponding to 3.08V nominal.
Does MAX6803US31D3 support manual reset, and what are the electrical requirements for the MR pin?
Yes, MAX6803US31D3 includes a debounced manual-reset input (MR) with an internal 20kΩ pullup resistor. A logic-low pulse ≥1µs on MR asserts RESET high; the pin recognizes VIH ≥ 0.7×VCC and VIL ≤ 0.3×VCC. No external components are needed - simply connect a momentary switch from MR to GND for operator-initiated reset.
What is the minimum supply voltage at which MAX6803US31D3 guarantees correct reset output behavior?
MAX6803US31D3 guarantees correct RESET output state down to VCC = 0.7V across the full -40°C to +125°C temperature range. This is explicitly stated in the General Description and Electrical Characteristics table, distinguishing it from the MAX6805 (1.0V min) and enabling robust operation during deep brownout events in battery-powered systems.
How does the 100ms reset timeout period of MAX6803US31D3 behave over temperature and supply voltage?
The 100ms minimum reset timeout period of MAX6803US31D3 is factory-programmed and exhibits <5% variation over -40°C to +125°C, as shown in the "Normalized Reset Timeout Period vs. Temperature" graph (toc02). It remains stable across VCC = 0.7V to 5.5V, ensuring consistent µP initialization timing regardless of operating conditions.
Is MAX6803US31D3 pin-compatible with other members of the MAX6803/MAX6804/MAX6805 family?
Yes, MAX6803US31D3 shares identical 4-pin SOT143 pinout and pin functions with all MAX6803, MAX6804, and MAX6805 variants - Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC. However, output polarity differs: MAX6803 is active-high push/pull, while MAX6804 is active-low push/pull and MAX6805 is active-low open-drain, so interchanging requires schematic review.
MAX6803US31D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-4
MAX6803US31D3 FAQ
1.How can I place an order for MAX6803US31D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6803US31D3 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 MAX6803US31D3 reliable?
The price and inventory of MAX6803US31D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6803US31D3 is usually 5 days.
3.What payment methods are accepted for MAX6803US31D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6803US31D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6803US31D3?
MAX6803US31D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6803US31D3 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 MAX6803US31D3?
For technical support, including MAX6803US31D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6803US31D3 requirements.
6.How does Aetrix verify that MAX6803US31D3 is sourced from the original manufacturer or authorized distributors?
All MAX6803US31D3 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 MAX6803US31D3 meets industry standards.
7.What is the process for return or replacement of MAX6803US31D3?
All MAX6803US31D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6803US31D3, 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 MAX6803US31D3 part is unused and in its original packaging.
Return procedure for MAX6803US31D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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