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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 SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:237
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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 during brownout/power-down, and guarantees valid RESET down to VCC = 0.7V-ideal for industrial controllers and portable equipment requiring reliable power-on reset.
For engineers reviewing the MAX6801UR31D3 datasheet, MAX6801UR31D3 pinout, MAX6801UR31D3 application, or MAX6801UR31D3 equivalent, key selection criteria include reset threshold accuracy (±3% over –40°C to +125°C), ultra-low 4µA supply current at 3V, transient-immune reset comparator, and guaranteed push/pull drive capability at low VCC.
Technical Context
The MAX6801UR31D3 implements a precision bandgap-based reset comparator with factory-trimmed 3.08V threshold (±1.8% at +25°C, ±3% over full temperature range) and built-in hysteresis to prevent chatter during slow VCC transitions. Its internal timing circuit generates a fixed 100ms (min) reset pulse after VCC rises above threshold, independent of external components.
Designed for robust operation in noisy environments, the device rejects fast VCC transients up to 30µs (at 100mV overdrive) and maintains valid RESET logic state down to VCC = 0.7V. The push/pull output drives low to ≤0.4V at 50µA sink current and high to ≥0.8×VCC at 500µA source current-enabling direct interface with CMOS microcontrollers without pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±3% over –40°C to +125°C - ensures reliable detection of brownout below nominal 3.3V supply |
| Reset Timeout Period | 100ms (min) - provides sufficient hold time for microcontroller initialization and peripheral stabilization |
| Supply Current | 4µA (typ) at VCC = 3.0V - enables multi-year battery life in portable monitoring devices |
| Operating Voltage Range | 0.7V to 5.5V - supports valid reset assertion even during deep brownout or partial power loss |
| Output Type | Push/pull active-low RESET - eliminates need for external pull-up resistor and reduces BOM count |
| VCC Transient Immunity | Rejects <30µs negative glitches at 100mV overdrive - prevents false resets in electrically noisy industrial settings |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
Pinout & Package
MAX6801UR31D3 is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. The compact footprint supports high-density PCB layouts in space-constrained portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for internal comparator and output stage; must be connected directly to system ground plane |
| 2 - RESET | Active-low push/pull reset output | Drives low (≤0.4V) during reset assertion; drives high (≥0.8×VCC) otherwise - no external pull-up required |
| 3 - VCC | Supply voltage input | Power source for internal circuitry; accepts 0.7V–5.5V; decoupling capacitor (0.1µF) recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±1.8% tolerance at +25°C - eliminates manual calibration and improves production yield |
| Ultra-low quiescent current | 4µA typical at 3V - extends battery runtime in always-on IoT sensors and handheld instruments |
| Guaranteed reset validity to 0.7V | RESET remains logically valid even as VCC collapses - prevents undefined microcontroller states during power failure |
| No external components required | Single-chip solution replaces discrete RC reset networks - reduces board area and assembly cost |
| Transient-immune comparator | Immune to VCC glitches <30µs - avoids spurious resets in motor-drive or switching-power-supply environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Power-up sequencing and brownout recovery in programmable logic controllers operating in factory-floor environments with fluctuating 24V DC supplies stepped down to 3.3V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M7 microcontroller until regulated 3.3V rail stabilizes and remains above 3.08V for ≥100ms. Use Value: Prevents firmware execution from corrupted memory by guaranteeing clean reset before CPU clock enable - critical for deterministic real-time control loops. | Use Scenario: Battery-powered ECG and SpO₂ monitors requiring multi-year operation on coin-cell batteries with strict power budget constraints. IC Role / Device Role / Timing Role: Reset supervisor monitoring 3.0V LDO output, asserting RESET during battery voltage sag below 3.08V and holding for 100ms after recovery. Use Value: 4µA supply current minimizes standby drain; 0.7V operational floor ensures reset remains valid even as battery discharges to end-of-life voltage (~2.0V). |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Under-hood body control units exposed to –40°C to +125°C ambient, powered from 12V automotive rail via 3.3V buck converter. IC Role / Device Role / Timing Role: Monitoring post-regulator 3.3V supply; generating 100ms reset pulse to ensure CAN controller and EEPROM initialization completes before communication starts. Use Value: Full-temperature-spec ±3% threshold accuracy prevents premature or delayed reset assertion across extreme thermal cycles - essential for ASIL-B functional safety compliance. | Use Scenario: DIN-rail mounted electricity meters with isolated power supplies and tamper-detection circuits requiring fail-safe startup after AC line interruption. IC Role / Device Role / Timing Role: Supervising 3.3V auxiliary supply derived from energy-harvesting capacitors; asserting RESET until voltage exceeds 3.08V and sustains for 100ms. Use Value: Push/pull output eliminates external pull-up resistor - reducing component count and improving long-term reliability in high-humidity meter enclosures. |
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 | Same 3.08V threshold and 100ms timeout, but rated only to +85°C (vs. +125°C); 10µA ICC vs. 4µA | Limited to commercial/industrial ambient; not suitable for under-hood or high-temp industrial use | Select when ambient stays ≤85°C and lowest cost is priority over extended temp or ultra-low current |
| TPS3808G30DBVR | 3.0V threshold (not 3.08V); 200ms timeout (not 100ms); 1.1µA ICC; requires external pull-up for open-drain output | Higher timing margin but less precise threshold match; open-drain output adds BOM and layout complexity | Select when longer reset hold time is acceptable and system already uses pull-up resistors for other reset signals |
Compared with MAX809TRD3-T and TPS3808G30DBVR, the MAX6801UR31D3 offers superior temperature range (–40°C to +125°C), lower quiescent current (4µA), and true push/pull output eliminating external components - making it optimal for high-reliability, battery-sensitive, and thermally demanding applications.
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 across extended temperature ranges and long product lifecycles.
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, communications, and consumer applications.
The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, pin-compatible microprocessor supervisory circuits optimized for space-constrained, battery-operated, and high-temperature embedded systems requiring guaranteed reset behavior during brownout and power cycling.
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, guaranteed to be within ±1.8% at +25°C and ±3% over the full –40°C to +125°C operating temperature range. This precision eliminates the need for external trimming components and ensures consistent brownout detection across environmental conditions. The 3.08V value corresponds to the "31" suffix per Table 1 in the datasheet.
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 output stage. The RESET pin actively drives high (≥0.8×VCC) when deasserted and low (≤0.4V at 50µA) when asserted. This integrated drive capability reduces BOM count and simplifies layout compared to open-drain alternatives like the MAX6802UR31D3.
What is the minimum supply voltage at which MAX6801UR31D3 guarantees valid RESET output logic levels?
The MAX6801UR31D3 guarantees valid RESET output logic states down to VCC = 0.7V - meaning the output remains firmly low during reset assertion and high when deasserted, even as the supply collapses. This specification ensures deterministic microcontroller behavior during deep brownout events, unlike many competitors that lose output drive capability below 1.0V.
How long does the reset pulse last on MAX6801UR31D3, and is it affected by temperature or supply voltage?
The MAX6801UR31D3 generates a minimum 100ms reset timeout period (tRP) after VCC rises above the 3.08V threshold. This duration is factory-programmed and remains stable across temperature (–40°C to +125°C) and supply voltage (0.7V to 5.5V), with typical variation of ±50% around nominal - ensuring consistent microcontroller initialization timing regardless of operating conditions.
Is MAX6801UR31D3 pin-compatible with other supervisory ICs, and which ones?
Yes, MAX6801UR31D3 is pin-compatible with the MAX809/MAX810 series, MAX6326/MAX6327/MAX6328, and MAX6346/MAX6347/MAX6348 families - all using the same 3-pin SOT23 footprint and pinout (GND, RESET, VCC). This allows drop-in replacement in existing designs without PCB changes, provided the reset threshold and timeout requirements align with the target application.
MAX6801UR31D3 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:
- 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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