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Analog Devices Inc./Maxim Integrated MAX6346UR45
- Part No.:
- MAX6346UR45
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR45.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,396
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Product details
Overview
MAX6346UR45 from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 4.5V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 4.500V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, 1µA max supply current at 3V, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset supervision.
For engineers reviewing the MAX6346UR45 datasheet, MAX6346UR45 pinout, MAX6346UR45 application, or MAX6346UR45 equivalent, key selection criteria include its 4.5V reset threshold accuracy, SOT23-3 package compatibility, push-pull active-low RESET output drive capability (0.3V @ 1.6mA), and guaranteed operation across industrial temperature range (-40°C to +85°C).
Technical Context
The MAX6346UR45 implements a precision bandgap-based reset comparator with hysteresis (9.5mV) and internal timing circuitry to guarantee ≥100ms reset assertion after VCC rises above threshold. Its push-pull output eliminates external pull-up components and supports direct interfacing with microcontrollers requiring active-low reset inputs.
It is immune to fast VCC transients (up to 100V/µs slew rate), includes factory-trimmed threshold calibration, and maintains valid reset state for VCC as low as 1.2V - enabling robust supervision during deep brownout events in embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V ±1.5% (25°C), ±2.5% (-40°C to +85°C); ensures precise 4.5V supply monitoring without external adjustment |
| Supply Current | 1.0µA max at 3V; enables multi-year battery life in always-on portable equipment |
| Reset Timeout | 100ms min power-up delay; guarantees µP initialization completes before release |
| Output Type | Active-low push-pull; drives RESET low directly without external pull-up, simplifies BOM |
| VCC Operating Range | 1.2V to 5.5V; remains functional during severe brownout down to 1.2V |
| Temperature Range | -40°C to +85°C; qualified for industrial-grade embedded applications |
| Reset Hysteresis | 9.5mV; prevents chatter near threshold during slow VCC recovery |
Pinout & Package
MAX6346UR45 is housed in a 3-pin SOT23-3 package (package code U3-1), with 1.3mm × 2.9mm footprint and 0.95mm height, suitable for high-density PCB layouts.
| 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 reset assertion (≤0.3V @ 1.6mA); actively drives high when released (≥0.8·VCC) |
| 3 (VCC) | Supply input | Power source for internal circuitry; monitors this rail for reset condition; accepts 1.2V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1µA max enables >10-year battery life in coin-cell-powered IoT sensors |
| Precision 4.5V reset threshold | Factory-trimmed to 4.500V with tight tolerance ensures accurate 4.5V supply supervision |
| Push-pull active-low output | Eliminates need for external pull-up resistor, reducing component count and board space |
| Brownout immunity down to 1.2V | Guarantees valid reset state even during deep undervoltage, preventing µP runaway |
| Transient noise rejection | Immune to VCC glitches up to 100V/µs slew rate, avoiding false resets in noisy environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch powered by CR2032 battery with 4.5V LDO output. IC Role / Device Role / Timing Role: Supervises 4.5V supply and asserts active-low reset to ARM Cortex-M0+ MCU during battery voltage sag. Use Value: 1µA supply current extends battery life beyond 3 years; 4.500V threshold matches LDO nominal output for early brownout detection. | Use Scenario: DIN-rail mounted remote I/O node with 4.5V isolated power rail feeding FPGA and communication ICs. IC Role / Device Role / Timing Role: Generates 100ms minimum reset pulse to synchronize FPGA configuration and UART initialization after power-up. Use Value: Push-pull output drives FPGA PROG_B pin directly; 1.2V VCC operation ensures reset remains asserted until auxiliary rails stabilize. |
| Smart Metering Endpoints | Automated Test Equipment (ATE) |
Use Scenario: Electricity meter using 4.5V DC-DC converter to power metrology SoC and RF transceiver. IC Role / Device Role / Timing Role: Monitors 4.5V rail and holds SoC in reset during AC line dropout or surge-induced voltage dip. Use Value: 9.5mV hysteresis prevents oscillation during slow VCC recovery; -40°C to +85°C rating supports outdoor deployment. | Use Scenario: Benchtop ATE fixture with 4.5V programmable supply powering DUT controller and interface logic. IC Role / Device Role / Timing Role: Provides clean, glitch-free reset to DUT microcontroller upon supply ramp-up or manual reset trigger. Use Value: Immunity to fast transients (100V/µs) prevents false resets during relay switching or load step events in test environment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR45D3T | Same 4.5V threshold, SOT23-3, but higher 10µA supply current and no 1.2V VCC operation guarantee | Limited to applications where ultra-low current is not critical and brownout below 1.8V is unlikely | Select MAX809TR45D3T only if legacy design reuse or cost sensitivity outweighs 10× higher ICC and reduced brownout margin |
| TPS3808G33DBVR | 3.3V fixed threshold; requires external resistor divider to monitor 4.5V, adding error and drift | Suitable only when redesign allows threshold scaling or dual-supply supervision is needed | Choose TPS3808G33DBVR only if system already uses TI ecosystem and 4.5V monitoring can be achieved via divider with <1% total error budget |
Compared with MAX809TR45D3T and TPS3808G33DBVR, MAX6346UR45 delivers superior battery life (1µA vs. 10µA), deeper brownout coverage (1.2V vs. 1.8V min), and exact 4.5V factory calibration - making it optimal for space-constrained, long-life, industrial-grade 4.5V-supervised systems.
Availability
MAX6346UR45 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart metering endpoints, and automated test equipment requiring stable component supply and long-term lifecycle support.
Supply support for MAX6346UR45 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, computing, and communications markets.
The MAX63xx family was engineered specifically for ultra-low-power, high-accuracy microprocessor reset supervision in battery-critical and industrial environments - emphasizing minimal ICC, wide VCC range, and factory-trimmed thresholds.
FAQ
What is the exact reset threshold voltage of MAX6346UR45 and how tightly is it specified?
The MAX6346UR45 has a nominal reset threshold of 4.500V, factory-trimmed with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This specification is guaranteed per datasheet Electrical Characteristics table and applies directly to the MAX6346UR45 device without external calibration.
Does MAX6346UR45 require an external pull-up resistor on its RESET pin?
No, MAX6346UR45 does not require an external pull-up resistor because it features a push-pull active-low RESET output. The output actively drives low during reset assertion and actively drives high (to ≥0.8·VCC) when released - eliminating the need for external components and reducing BOM count.
What is the minimum VCC voltage at which MAX6346UR45 guarantees correct reset behavior?
MAX6346UR45 guarantees correct reset state (asserted or de-asserted as appropriate) for VCC down to 1.2V over the full -40°C to +85°C temperature range. This is explicitly stated in the datasheet Absolute Maximum Ratings and Electrical Characteristics sections and verified across production lots.
How long is the reset pulse width generated by MAX6346UR45 after VCC rises above threshold?
MAX6346UR45 guarantees a minimum reset timeout of 100ms after VCC rises above the 4.500V threshold, with typical values ranging from 100ms to 280ms depending on temperature and unit variation. This ensures sufficient time for microprocessor initialization and peripheral stabilization before release.
Is MAX6346UR45 compatible with standard SOT23-3 footprints and assembly processes?
Yes, MAX6346UR45 uses the industry-standard SOT23-3 package (outline U3-1, land pattern 90-0179) and is compatible with standard reflow soldering profiles, pick-and-place equipment, and IPC-7351-compliant footprints - enabling drop-in replacement in existing designs using other SOT23-3 supervisors.
MAX6346UR45 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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6346UR45 FAQ
1.How can I place an order for MAX6346UR45 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR45 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 MAX6346UR45 reliable?
The price and inventory of MAX6346UR45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR45 is usually 5 days.
3.What payment methods are accepted for MAX6346UR45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR45?
MAX6346UR45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR45 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 MAX6346UR45?
For technical support, including MAX6346UR45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR45 requirements.
6.How does Aetrix verify that MAX6346UR45 is sourced from the original manufacturer or authorized distributors?
All MAX6346UR45 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 MAX6346UR45 meets industry standards.
7.What is the process for return or replacement of MAX6346UR45?
All MAX6346UR45 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR45, 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 MAX6346UR45 part is unused and in its original packaging.
Return procedure for MAX6346UR45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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