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Analog Devices Inc./Maxim Integrated MAX6346UR44
- Part No.:
- MAX6346UR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR44.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:759
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Product details
Overview
MAX6346UR44 from Maxim Integrated is a precision active-low push-pull microprocessor supervisory circuit designed to monitor 4.38V power supplies and assert reset during brownout, power-up, and power-down events. It features factory-trimmed 4.38V reset threshold (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current at 3V, and operates down to 1.2V VCC. It is used in battery-powered controllers requiring reliable, low-power supply monitoring.
For engineers reviewing the MAX6346UR44 datasheet, MAX6346UR44 pinout, MAX6346UR44 application, or MAX6346UR44 equivalent, this page delivers verified electrical parameters, SOT23-3 package details, reset timing behavior, thermal stability data, and validated alternative options for industrial embedded and portable µP systems.
Technical Context
The MAX6346UR44 implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC drops below its 4.38V threshold. Its internal reset timer guarantees ≥100ms assertion after VCC recovers, independent of supply ramp rate.
It uses a push-pull output stage capable of sourcing 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V - eliminating external pull-up resistors. The device ignores transients <20µs at 100mV overdrive and maintains functional state down to 1.2V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±2.5% over -40°C to +85°C - ensures stable brownout detection for 4.3V–4.4V nominal rails |
| Supply Current | 1.0µA max at 3V - enables multi-year operation in coin-cell–powered instrumentation |
| Reset Timeout | 100ms to 280ms - meets JEDEC JESD76B power-on reset duration requirements |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and full-system power sequencing |
| Output Type | Active-low push-pull - drives reset lines directly without external components or pull-ups |
| Tempco | 40ppm/°C - limits threshold drift to <12mV across full temperature range |
| Hysteresis | 9.5mV - prevents chatter during slow VCC recovery near threshold |
Pinout & Package
MAX6346UR44 is housed in a 3-pin SOT23-3 package (JEDEC TO-236AB), footprint-compatible with industry-standard µP reset ICs and optimized 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 µP RESET pin low during fault; sources 500µA / sinks 1.6mA; no external pull-up required |
| 3 (VCC) | Supply input | Monitored power rail input; accepts 1.2V–5.5V; internally decoupled with on-chip capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V with ±2.5% tolerance over full temperature range - eliminates manual calibration and external resistor networks |
| Ultra-low quiescent current | 1µA max at 3V - extends battery life in portable medical sensors and IoT edge nodes |
| Transient immunity | Rejects VCC glitches <20µs at 100mV overdrive - prevents false resets in noisy automotive or industrial environments |
| Guaranteed reset assertion down to 1.2V VCC | Ensures deterministic reset behavior during deep brownout - critical for flash memory write integrity |
| Push-pull output architecture | Eliminates need for external pull-up resistor - reduces BOM count and layout area in space-constrained modules |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous operation in factory-floor automation cabinets with fluctuating 24VDC-derived 5V rails subject to motor switching noise. IC Role / Device Role / Timing Role: Monitors 4.38V intermediate rail and asserts active-low reset to ARM Cortex-M7 controller upon undervoltage. Use Value: Prevents firmware corruption during 10–50ms brownouts caused by contactor switching; 100ms timeout ensures full processor initialization before code execution. |
Use Scenario: Multi-year deployment in remote environmental monitoring stations powered by Li-SOCl₂ cells with gradual voltage decay. IC Role / Device Role / Timing Role: Supervises regulated 4.38V supply feeding MSP430 microcontroller and ADC front-end. Use Value: 1µA max ICC enables >10-year battery life; precise 4.38V threshold triggers graceful shutdown before sensor biasing fails. |
| Medical Infusion Pumps | Smart Energy Meters |
Use Scenario: Safety-critical drug delivery systems requiring fail-safe reset during AC/DC adapter dropout or battery swap. IC Role / Device Role / Timing Role: Resets PIC18F microcontroller when 4.38V backup rail falls below safe operating margin. Use Value: Push-pull output guarantees immediate, low-impedance reset assertion - avoids reliance on weak internal µP pull-ups that delay fault response. |
Use Scenario: ANSI C12.20-compliant electricity meters exposed to grid surges and lightning-induced transients. IC Role / Device Role / Timing Role: Guards 4.38V LDO output powering metrology SoC and real-time clock. Use Value: 40ppm/°C tempco and 9.5mV hysteresis prevent spurious resets during rapid ambient temperature swings in outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR44 | Same 4.38V threshold, identical SOT23-3 package, but rated only to +70°C (vs. +85°C); 1.75µA max ICC at 5.5V | Not qualified for extended-temperature industrial or automotive under-hood use | Select MAX6326UR44 only for cost-sensitive commercial-grade designs with ambient <70°C |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable), 1.8µA max ICC, open-drain output requiring external pull-up | Lacks precision 4.38V trip point; unsuitable where VCC rail matches 4.38V nominal (e.g., LiFePO₄ battery monitors) | Choose TPS3808G33DBVR only when system uses 3.3V logic and board space allows pull-up resistor |
Compared with MAX6326UR44, the MAX6346UR44 adds guaranteed operation to +85°C and lower ICC - making it preferred for industrial control. Versus TPS3808G33DBVR, its 4.38V threshold and push-pull output provide direct compatibility with 4.3V–4.4V battery-backed rails without design compromises.
Availability
MAX6346UR44 is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, smart energy meters, and portable instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6346UR44 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6346UR44 belongs to Maxim's ultra-low-power µP supervisory family, engineered specifically for reliable power-monitoring in battery-constrained and thermally demanding embedded systems where precision reset timing and minimal current draw are critical.
FAQ
What is the exact reset threshold voltage of MAX6346UR44 and how does it vary with temperature?
The MAX6346UR44 has a factory-trimmed nominal reset threshold of 4.38V, specified as 4.270V (min) to 4.489V (max) over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in ≤12mV total drift across the temperature span - ensuring consistent brownout detection in industrial environments.
Does MAX6346UR44 require an external pull-up resistor on its RESET pin?
No. The MAX6346UR44 features a push-pull active-low RESET output capable of sourcing 500µA and sinking 1.6mA. This eliminates the need for an external pull-up resistor, reducing BOM count and PCB area - a key advantage over open-drain alternatives like MAX6348UR44.
What is the minimum VCC voltage at which MAX6346UR44 guarantees correct reset assertion?
The MAX6346UR44 is guaranteed to maintain correct reset state down to 1.2V VCC across the full -40°C to +85°C temperature range. This ensures reliable operation during deep brownout conditions where other supervisors may release reset prematurely, risking firmware corruption.
How long does the RESET signal remain asserted after VCC rises above the threshold in MAX6346UR44?
The MAX6346UR44 asserts RESET for a minimum of 100ms after VCC rises above the 4.38V threshold, with typical timeout ranging from 100ms to 280ms depending on temperature and process variation. This meets JEDEC JESD76B requirements for robust power-on reset sequencing.
Is MAX6346UR44 pin-compatible with legacy Maxim reset ICs like MAX809?
Yes. The MAX6346UR44 uses the same SOT23-3 pinout (GND, RESET, VCC) and is explicitly stated as pin-compatible with MAX803/MAX809/MAX810 in the datasheet. This allows drop-in replacement in existing designs without PCB modifications or layout changes.
MAX6346UR44 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:
- 4.38V
- 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
MAX6346UR44 FAQ
1.How can I place an order for MAX6346UR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR44 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 MAX6346UR44 reliable?
The price and inventory of MAX6346UR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR44 is usually 5 days.
3.What payment methods are accepted for MAX6346UR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR44?
MAX6346UR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR44 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 MAX6346UR44?
For technical support, including MAX6346UR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR44 requirements.
6.How does Aetrix verify that MAX6346UR44 is sourced from the original manufacturer or authorized distributors?
All MAX6346UR44 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 MAX6346UR44 meets industry standards.
7.What is the process for return or replacement of MAX6346UR44?
All MAX6346UR44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR44, 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 MAX6346UR44 part is unused and in its original packaging.
Return procedure for MAX6346UR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6346UR44 Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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