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Analog Devices Inc./Maxim Integrated MAX6802UR31D3
- Part No.:
- MAX6802UR31D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6802UR31D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,697
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Product details
Overview
MAX6802UR31D3 from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed to monitor 3.08V power supplies with 100ms minimum reset timeout. It guarantees valid RESET output down to VCC = 1.0V, draws only 5µA typical supply current at +5V, and rejects fast VCC transients up to 30µs at 100mV overdrive - used for reliable power-on/brownout reset in portable battery-powered systems.
For engineers reviewing the MAX6802UR31D3 datasheet, MAX6802UR31D3 pinout, MAX6802UR31D3 application, or MAX6802UR31D3 equivalent, key selection criteria include its factory-trimmed 3.08V reset threshold, open-drain output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), guaranteed operation down to 1.0V VCC, and immunity to sub-30µs supply glitches.
Technical Context
The MAX6802UR31D3 implements a precision bandgap-based reset comparator with factory-trimmed 3.08V threshold (±3% over -40°C to +125°C) and internal 100ms minimum timeout timer. Its open-drain RESET output requires an external pullup resistor and supports wired-OR configurations.
It operates across full industrial temperature range (-40°C to +125°C), maintains functional reset assertion during VCC ramp-down and ramp-up, and suppresses false resets by ignoring transients shorter than 30µs when VCC dips 100mV below threshold - confirmed by Maximum Transient Duration vs. Overdrive characterization data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% (factory-trimmed; ensures precise brownout detection at nominal 3.08V rail) |
| Reset Timeout Period | 100ms minimum (guaranteed hold time after VCC rises above threshold; prevents premature µP release) |
| Supply Voltage Range | 1.0V to 5.5V (enables operation during deep brownout; valid RESET asserted down to 1.0V VCC) |
| Supply Current | 5µA typical at +5V (ultra-low quiescent current extends battery life in portable equipment) |
| RESET Output Type | Open-drain active-low (supports bidirectional µP reset pins and wired-OR reset bus architectures) |
| VCC Transient Immunity | Rejects ≤30µs negative transients at 100mV overdrive (prevents false resets from noise or switching spikes) |
| Operating Temperature | -40°C to +125°C (fully specified for automotive and industrial environments) |
Pinout & Package
MAX6802UR31D3 is housed in a 3-pin SOT23 package (outline U3-1, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane |
| 2 | RESET | Open-drain active-low reset output; requires external pullup resistor (typically 10kΩ–100kΩ) to VCC or another logic rail |
| 3 | VCC | Power supply input; monitors this voltage for reset assertion; powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±3% tolerance over full temperature range - eliminates need for external resistor divider calibration |
| Open-drain output architecture | Enables direct interface with bidirectional µP reset pins (e.g., Motorola 68HC11) and multi-source reset buses |
| 100ms minimum reset timeout | Ensures µP completes internal initialization before release; avoids race conditions during power-up sequencing |
| 1.0V minimum operating VCC | Guarantees correct reset state down to 1.0V - critical for detecting deep brownout before system collapse |
| 4.0µA to 5.0µA supply current | Minimizes standby power draw in battery-backed or energy-harvesting applications |
Applications
| Battery-Powered Portable Equipment | Automotive Body Control Modules |
|---|---|
Use Scenario: Power management in handheld medical devices or IoT sensors where battery voltage decays gradually from 3.6V to 2.8V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET until VCC stabilizes above 3.08V and holds it for ≥100ms post-ramp. Use Value: Prevents firmware execution on marginal supply; enables safe low-voltage shutdown without external components. | Use Scenario: Reset coordination in LIN-connected door module controllers exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 3.3V domain; asserts open-drain RESET during brownout and rejects <30µs supply glitches per automotive EMC requirements. Use Value: Ensures deterministic µP restart after ignition cycling; eliminates need for transient filtering RC networks. |
| Industrial Programmable Logic Controllers | Smart Energy Meters |
Use Scenario: Main CPU supervision in DIN-rail mounted PLCs operating from unregulated 5V DC input with wide ambient temperature swing. IC Role / Device Role / Timing Role: Provides temperature-stable 3.08V threshold detection and 100ms timeout across -40°C to +125°C. Use Value: Guarantees robust reset behavior under thermal stress without derating or margining. | Use Scenario: Meter SoC reset control where backup supercapacitor sustains 3.0V rail during AC mains interruption. IC Role / Device Role / Timing Role: Detects decay below 3.08V and holds RESET active for ≥100ms to allow secure state save before power loss. Use Value: Meets IEC 62056-21 data integrity requirements during power fail events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | Push/pull active-low RESET; 3.08V threshold; 100ms timeout; same SOT23-3 package | Lacks open-drain flexibility; cannot interface directly with bidirectional µP reset pins | Select when system uses dedicated reset input and no wired-OR requirement exists |
| TPS3808G30DBVR | Open-drain active-low RESET; 3.0V threshold; adjustable timeout via capacitor; 6-pin SOT23 | Different pin count and layout; timeout not factory-fixed; higher quiescent current (1.1µA min) | Select when design requires programmable timeout or tighter 3.0V threshold tolerance (±0.5%) |
Compared with MAX809TRD3-T and TPS3808G30DBVR, the MAX6802UR31D3 uniquely combines factory-set 3.08V/100ms operation, guaranteed 1.0V VCC functionality, and true open-drain output in a 3-pin footprint - making it optimal for space-limited, bidirectional-reset, and deep-brownout-sensitive designs.
Availability
MAX6802UR31D3 is available at Aetrix Electronics and suitable for battery-powered portable equipment, automotive body control modules, and industrial programmable logic controllers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6802UR31D3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX6800/MAX6801/MAX6802 product line delivers ultra-low-power, pin-compatible µP supervisory circuits with factory-trimmed thresholds and fixed timeout periods - engineered for reliability in space-constrained, battery-sensitive, and thermally demanding systems.
FAQ
What is the exact reset threshold voltage of MAX6802UR31D3 and how tightly is it specified?
The MAX6802UR31D3 has a factory-trimmed reset threshold of 3.08V, with ±3% tolerance over the full operating temperature range of -40°C to +125°C. This specification is guaranteed in production testing and documented in the Electrical Characteristics table. The threshold remains stable across voltage and temperature variations, eliminating need for external calibration. MAX6802UR31D3 is therefore suited for applications requiring precise brownout detection at 3.08V rails.
Does MAX6802UR31D3 support operation during deep brownout conditions?
Yes, MAX6802UR31D3 guarantees functional reset assertion down to VCC = 1.0V - unlike push/pull variants (MAX6800/MAX6801) rated to 0.7V. Below 1.0V, the internal comparator and output stage may become indeterminate. This 1.0V minimum ensures reliable detection of severe brownout events before system collapse, especially in battery-powered systems where voltage decay crosses critical thresholds. MAX6802UR31D3 thus provides deterministic behavior deeper into supply collapse than many competing supervisors.
Why does MAX6802UR31D3 use an open-drain output instead of push/pull?
The open-drain output of MAX6802UR31D3 enables direct interfacing with microprocessors that have bidirectional reset pins - such as the Motorola 68HC11 - by allowing either the supervisor or µP to assert reset using a single pullup resistor. It also supports wired-OR reset buses where multiple sources (e.g., watchdog, manual reset, power monitor) share one reset line. This architecture avoids contention and simplifies system-level reset coordination. MAX6802UR31D3 leverages this flexibility without requiring additional logic or level-shifting components.
What is the maximum duration of VCC transient that MAX6802UR31D3 can ignore without asserting reset?
MAX6802UR31D3 rejects negative-going VCC transients up to 30µs in duration when the dip exceeds 100mV below the 3.08V threshold - as verified in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph in the datasheet. This immunity prevents false resets caused by switching noise, ESD coupling, or load-step artifacts. The rejection window scales inversely with overdrive amplitude: larger dips tolerate shorter durations. MAX6802UR31D3 thus delivers robust performance in electrically noisy environments like automotive or industrial motor-control systems.
Is MAX6802UR31D3 compatible with lead-free PCB assembly processes?
Yes, MAX6802UR31D3 is available in lead-free packaging compliant with RoHS and JEDEC J-STD-020 reflow profiles. The device supports peak reflow temperatures up to +260°C for lead-free soldering, matching standard Pb-free assembly requirements. Standard ordering uses "-T" suffix; lead-free versions replace "-T" with "+T". MAX6802UR31D3 has been qualified for tape-and-reel delivery and undergoes full reliability screening per AEC-Q200 for automotive-grade variants - ensuring compatibility with modern high-volume manufacturing lines.
MAX6802UR31D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6802UR31D3 FAQ
1.How can I place an order for MAX6802UR31D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6802UR31D3 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 MAX6802UR31D3 reliable?
The price and inventory of MAX6802UR31D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6802UR31D3 is usually 5 days.
3.What payment methods are accepted for MAX6802UR31D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6802UR31D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6802UR31D3?
MAX6802UR31D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6802UR31D3 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 MAX6802UR31D3?
For technical support, including MAX6802UR31D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6802UR31D3 requirements.
6.How does Aetrix verify that MAX6802UR31D3 is sourced from the original manufacturer or authorized distributors?
All MAX6802UR31D3 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 MAX6802UR31D3 meets industry standards.
7.What is the process for return or replacement of MAX6802UR31D3?
All MAX6802UR31D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6802UR31D3, 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 MAX6802UR31D3 part is unused and in its original packaging.
Return procedure for MAX6802UR31D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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