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Analog Devices Inc./Maxim Integrated MAX6801UR31D3+
- Part No.:
- MAX6801UR31D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6801UR31D3+.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,412
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Product details
Overview
MAX6801UR31D3+ from Maxim Integrated is a 3-pin SOT23 microprocessor supervisory circuit with push/pull active-low RESET output, factory-trimmed 3.08V reset threshold, and 100ms minimum reset timeout period. It monitors VCC in 2.85V–5.0V systems, asserts reset below threshold, holds reset for ≥100ms after VCC recovery, and operates down to 0.7V supply-enabling reliable power-on reset in battery-powered microcontroller applications.
For engineers reviewing the MAX6801UR31D3+ datasheet, MAX6801UR31D3+ pinout, MAX6801UR31D3+ application, or MAX6801UR31D3+ equivalent, key selection criteria include its guaranteed RESET validity to VCC = 0.7V, 4µA typical supply current at 3V, immunity to fast VCC transients (≤30µs at 100mV overdrive), and compatibility with space-constrained embedded designs requiring precise brownout detection.
Technical Context
The MAX6801UR31D3+ implements a precision bandgap-based reset comparator with factory-trimmed 3.08V threshold (±1.8% at +25°C, ±3% over –40°C to +125°C) and internal timing circuitry generating a fixed 100ms (min) reset pulse width. Its push/pull output drives low with ≤0.4V at 50µA sink current and high with ≥0.8×VCC at 500µA source current.
Designed for BiCMOS process, it features transient-immune reset assertion logic that ignores VCC glitches <30µs (at 100mV overdrive), supports operation across –40°C to +125°C, and maintains valid RESET/RESET states down to VCC = 0.7V-ensuring deterministic behavior during power ramp-up, brownout, and shutdown sequences in μP-based systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.8% at +25°C; ensures reliable brownout detection at nominal 3.3V rail |
| Reset Timeout Period | 100ms (min); guarantees sufficient hold time for μP initialization before release |
| Supply Voltage Range | 0.7V to 5.5V; enables operation during deep brownout and full-system power-up |
| Supply Current | 4µA typical at VCC = 3.0V; minimizes quiescent drain in battery-critical applications |
| Output Type | Active-low push/pull RESET; eliminates external pull-up resistor and supports direct μP reset pin drive |
| VCC Transient Immunity | Rejects negative-going glitches ≤30µs at 100mV overdrive; prevents false resets from noise |
| Operating Temperature | –40°C to +125°C; qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX6801UR31D3+ is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height-optimized for PCB area-constrained designs.
| 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) | Active-low push/pull reset output | Drives low during VCC undervoltage or timeout; actively pulls high when released-no external pull-up required |
| 3 (VCC) | Power supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±1.8% accuracy at +25°C enables precise 3.3V rail monitoring without calibration |
| Ultra-low supply current | 4µA typical at 3V allows multi-year operation on coin-cell batteries in portable instrumentation |
| Guaranteed RESET validity to 0.7V | Ensures deterministic reset state even during severe brownout-critical for fail-safe μP startup |
| Transient-immune comparator | Rejects sub-30µs VCC glitches, eliminating false resets in electrically noisy industrial environments |
| 100ms minimum reset timeout | Provides ample hold time for slow-starting peripherals and flash memory initialization sequences |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 3.3V supply rails and EMI-induced voltage transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M4 microcontroller during brownout and power-up sequencing. Use Value: Prevents erratic firmware execution by guaranteeing ≥100ms reset hold time and rejecting <30µs supply noise-reducing field failures. |
Use Scenario: Battery-powered ECG monitors requiring long shelf life and deterministic startup after cold boot or low-battery recovery. IC Role / Device Role / Timing Role: Power-on reset generator ensuring microcontroller remains held in reset until 3.3V rail stabilizes above 3.08V and remains valid down to 0.7V. Use Value: 4µA quiescent current extends battery life; 0.7V operational floor enables reset assertion even during deep discharge events. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Under-hood BCMs exposed to –40°C to +125°C ambient and load-dump transients on 3.3V auxiliary rails. IC Role / Device Role / Timing Role: Brownout detector interfacing directly with Infineon AURIX TC3xx reset pin via push/pull output. Use Value: –40°C to +125°C qualification and 3.08V threshold match 3.3V rail tolerance; eliminates need for external RC network. |
Use Scenario: DIN-rail mounted electricity meters with isolated 3.3V logic supply subject to grid sags and lightning-induced surges. IC Role / Device Role / Timing Role: Primary reset supervisor for Renesas RL78 microcontroller, asserting RESET during 200ms grid interruptions. Use Value: 100ms min timeout exceeds IEC 62053-21 sag immunity requirements; 0.7V operation ensures reset during worst-case undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.93V reset threshold, 240ms min timeout, same SOT23-3 package and push/pull output | Longer timeout suits slower μPs; tighter 2.93V threshold better matches 3.0V rails | Select when longer reset hold time is needed and 3.0V system margin permits lower threshold |
| MAX6326UT29D3+ | 2.93V threshold, 100ms timeout, same pinout but higher 10µA supply current | Higher ICC reduces battery life in ultra-low-power designs; identical thermal and noise performance | Choose only if MAX6801UR31D3+ is unavailable and 10µA ICC is acceptable for the application |
Compared with MAX809TRD3+T and MAX6326UT29D3+, the MAX6801UR31D3+ offers optimal balance of 3.08V threshold alignment with common 3.3V rails, lowest quiescent current (4µA), and guaranteed 0.7V operation-making it preferred for battery-sensitive, high-reliability embedded systems.
Availability
MAX6801UR31D3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6801UR31D3+ 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, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, factory-trimmed supervisory circuits for microprocessor reset generation-targeting space- and power-constrained embedded systems needing deterministic brownout response.
FAQ
What is the exact reset threshold voltage of MAX6801UR31D3+ and how tightly is it specified?
The MAX6801UR31D3+ has a factory-trimmed nominal reset threshold of 3.08V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C temperature range. This specification ensures accurate brownout detection for 3.3V systems while maintaining robustness across environmental extremes. The MAX6801UR31D3+ datasheet confirms this value in Table 1 and Electrical Characteristics.
Does MAX6801UR31D3+ require an external pull-up resistor on its RESET pin?
No, MAX6801UR31D3+ does not require an external pull-up resistor because it features a push/pull active-low RESET output. The internal driver actively pulls the pin low during reset assertion and high when released-enabling direct connection to microcontroller reset inputs without additional components. This is confirmed in the Pin Description and Typical Operating Circuit sections of the MAX6801UR31D3+ datasheet.
What is the minimum supply voltage at which MAX6801UR31D3+ guarantees correct RESET output state?
The MAX6801UR31D3+ guarantees correct RESET/RESET output state down to VCC = 0.7V, as stated in the General Description and Absolute Maximum Ratings sections. This ensures deterministic reset behavior during deep brownout conditions where many competing supervisors fail-making MAX6801UR31D3+ suitable for battery-powered applications with wide voltage excursions.
How does MAX6801UR31D3+ handle fast transients on the VCC supply line?
The MAX6801UR31D3+ reset comparator is designed to ignore fast negative-going VCC transients: it rejects pulses ≤30µs in duration when the overdrive is 100mV, as shown in the Maximum Transient Duration vs. Reset Comparator Overdrive graph. This immunity prevents false resets in electrically noisy environments such as motor drives or switching power supplies-confirmed in the Applications Information section of the MAX6801UR31D3+ datasheet.
What package type and footprint does MAX6801UR31D3+ use, and is it RoHS-compliant?
MAX6801UR31D3+ uses a 3-pin SOT23 package (outline 21-0051, land pattern 90-0179) with 1.3mm × 2.9mm body size and 0.95mm height. The "+" suffix indicates RoHS-compliant, lead-free construction per Maxim's ordering conventions. Package dimensions and soldering profiles-including reflow at +260°C for lead-free variants-are documented in the MAX6801UR31D3+ Package Information section.
MAX6801UR31D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- 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 Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6801UR31D3+ FAQ
1.How can I place an order for MAX6801UR31D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6801UR31D3+ 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 MAX6801UR31D3+ reliable?
The price and inventory of MAX6801UR31D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6801UR31D3+ is usually 5 days.
3.What payment methods are accepted for MAX6801UR31D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6801UR31D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6801UR31D3+?
MAX6801UR31D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6801UR31D3+ 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 MAX6801UR31D3+?
For technical support, including MAX6801UR31D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6801UR31D3+ requirements.
6.How does Aetrix verify that MAX6801UR31D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6801UR31D3+ 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 MAX6801UR31D3+ meets industry standards.
7.What is the process for return or replacement of MAX6801UR31D3+?
All MAX6801UR31D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6801UR31D3+, 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 MAX6801UR31D3+ part is unused and in its original packaging.
Return procedure for MAX6801UR31D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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