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Analog Devices Inc./Maxim Integrated MAX6346XR44
- Part No.:
- MAX6346XR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR44.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,653
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Product details
Overview
MAX6346XR44 from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 4.38V power supplies and assert a reset signal during brownout, power-up, or power-down events. It guarantees correct operation down to VCC = 1.2V, delivers ≥100ms reset timeout after VCC recovery, and consumes ≤1µA supply current at +25°C. It is used in portable battery-powered systems requiring reliable, low-cost power monitoring without external components.
For engineers reviewing the MAX6346XR44 datasheet, MAX6346XR44 pinout, MAX6346XR44 application, or MAX6346XR44 equivalent, this page provides verified technical context, pin-level design meaning, real-world use scenarios, and validated alternative options for µP reset supervision in space-constrained industrial and embedded designs.
Technical Context
The MAX6346XR44 implements a precision bandgap-based reset comparator with factory-trimmed 4.38V threshold (±1.5% at +25°C, ±2.5% over –40°C to +85°C) and 9.5mV hysteresis. Its push-pull RESET output drives low (≤0.3V at 1.6mA sink) when VCC falls below threshold and remains asserted for ≥100ms after VCC rises above threshold.
It features transient immunity up to 100V/µs dV/dt on VCC, operates across 1.2V–5.5V supply range, and maintains functional integrity down to 1V - enabling robust reset generation even during deep brownouts. All timing and voltage specifications are fully characterized over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (±2.5% over –40°C to +85°C); ensures reliable detection of 4.38V rail collapse before system instability. |
| Supply Current | ≤1.0µA max at +25°C; enables multi-year battery life in always-on portable instrumentation. |
| Reset Timeout | 100–280ms min–max power-up delay; satisfies µP minimum reset pulse width requirements across temperature. |
| Output Type | Active-low push-pull; eliminates need for external pull-up resistor and supports direct interface to µP reset inputs. |
| VCC Operating Range | 1.2V to 5.5V; functions correctly during deep undervoltage conditions where other supervisors fail. |
| Reset Hysteresis | 9.5mV; prevents chatter during slow-rising or noisy VCC transitions near threshold. |
| Transient Immunity | Rated for 100V/µs dV/dt on VCC; suppresses false resets caused by switching noise or ESD-induced glitches. |
Pinout & Package
MAX6346XR44 is housed in a 3-pin SC70-3 package (outline 21-0075), footprint-compatible with SOT23-3 but with smaller 1.25mm × 0.85mm body and 0.65mm lead pitch. This package enables high-density PCB layouts in handheld and sensor-node applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be connected directly to low-impedance system ground plane. |
| 2 (RESET) | Active-low push-pull reset output | Drives low (≤0.3V @ 1.6mA) during fault; actively pulls high (≥0.8×VCC) when deasserted - no external pull-up required. |
| 3 (VCC) | Supply input | Monitored power rail input; also powers internal circuitry; accepts 1.2V–5.5V with full functionality guaranteed. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed threshold | 4.38V with ±1.5% tolerance at +25°C - eliminates manual calibration and reduces BOM count. |
| Ultra-low ICC | ≤1µA max - extends battery life in coin-cell–powered IoT edge nodes and wearables. |
| Push-pull RESET | No external pull-up needed - simplifies layout, reduces component count, and improves noise margin vs. open-drain alternatives. |
| Full temp spec | All parameters guaranteed from –40°C to +85°C - suitable for industrial control and automotive under-hood auxiliary modules. |
| Transient immunity | Immune to fast VCC transients up to 100V/µs - prevents spurious resets in electrically noisy motor-drive or power-conversion environments. |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Long-term environmental sensor node powered by CR2032 coin cell, logging temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output feeding µC and sensors; asserts RESET if battery drops below 3.0V, preventing corrupted flash writes. Use Value: 1µA quiescent current extends operational life beyond 5 years; 100ms reset pulse ensures µC completes safe shutdown before brownout lockup. | Use Scenario: DIN-rail mounted I/O expansion module interfacing with 24V DC field buses and local 5V logic rails. IC Role / Device Role / Timing Role: Monitors 5V logic supply derived from isolated DC/DC converter; triggers hard reset on line transients or partial power loss. Use Value: 100V/µs dV/dt immunity prevents nuisance resets during relay coil switching; SC70 package saves board space in dense modular backplanes. |
| Medical Point-of-Care Devices | Smart Energy Meters |
Use Scenario: Handheld blood glucose meter with LCD, Bluetooth LE, and electrochemical sensor front-end. IC Role / Device Role / Timing Role: Supervises 3.3V rail powering BLE SoC and analog front-end; holds RESET until stable after button-press wake-up from deep sleep. Use Value: Push-pull output eliminates pull-up resistor - critical for minimizing leakage paths in high-impedance sensor circuits and reducing standby current. | Use Scenario: Revenue-grade electricity meter with dual 3.3V/5V rails, real-time clock, and tamper-detection circuitry. IC Role / Device Role / Timing Role: Monitors 5V rail supplying metrology ADC and isolation barrier; asserts RESET during AC mains dropout or lightning-induced surges. Use Value: Guaranteed operation down to 1.2V allows clean reset assertion even as bulk capacitors sag - ensuring EEPROM write integrity during grid faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR44D3T | Same 4.38V threshold, SOT23-3 package, but open-drain RESET output requiring external pull-up. | Lacks push-pull drive strength; unsuitable where low-leakage or resistor-free design is mandatory. | Select only if existing layout uses open-drain topology or requires wired-OR reset bus sharing. |
| TPS3808G33DBVR | 4.38V threshold, 1.6µA typical ICC, push-pull output, but wider 1.8V–6.0V VCC range and 200ms min timeout. | Higher supply current and longer timeout may conflict with ultra-low-power or tight µP timing budgets. | Prefer when extended VCC range or enhanced ESD robustness (±4kV HBM) is prioritized over sub-1µA ICC. |
Compared with MAX809TR44D3T and TPS3808G33DBVR, the MAX6346XR44 uniquely combines 4.38V precision, sub-1µA ICC, push-pull output, and SC70-3 footprint - making it optimal for space- and energy-constrained applications where external components must be eliminated and reset timing tightly controlled.
Availability
MAX6346XR44 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial I/O modules, and medical point-of-care devices requiring stable component supply and long-term lifecycle support.
Supply support for MAX6346XR44 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, medical, communications, and consumer applications.
The MAX63xx family delivers ultra-low-power, factory-trimmed µP supervisory circuits optimized for reliable reset generation in portable, space-constrained, and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6346XR44 and how stable is it over temperature?
The MAX6346XR44 has a nominal reset threshold of 4.38V, trimmed at the factory with ±1.5% tolerance at +25°C and ±2.5% over the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in ≤15mV total drift across temperature - sufficient for stable supervision of 4.38V rails in industrial environments without recalibration.
Does MAX6346XR44 require an external pull-up resistor on its RESET pin?
No, MAX6346XR44 does not require an external pull-up resistor because it features a push-pull RESET output. When deasserted, the output actively drives high to ≥0.8×VCC; when asserted, it sinks current to ≤0.3V at 1.6mA. This eliminates the need for external components and improves noise immunity compared to open-drain alternatives like MAX6348XR44.
What is the minimum VCC voltage at which MAX6346XR44 guarantees correct reset behavior?
MAX6346XR44 guarantees correct reset assertion and deassertion down to VCC = 1.2V over temperature. While the device remains powered and functional as low as 1.0V, the datasheet specifies full parametric compliance - including reset timeout accuracy and output drive strength - from 1.2V to 5.5V. This ensures reliable operation during severe brownout conditions.
How does the 100ms minimum reset timeout of MAX6346XR44 meet µP requirements?
The MAX6346XR44 guarantees a minimum 100ms reset pulse width after VCC rises above the 4.38V threshold, meeting or exceeding the power-on reset timing requirements of most 8-/16-/32-bit microcontrollers (e.g., ARM Cortex-M, PIC, MSP430). Its actual timeout ranges from 100ms to 280ms depending on temperature and process variation - providing margin against µP minimum specification limits.
Is MAX6346XR44 pin-compatible with legacy Maxim reset ICs like MAX809?
MAX6346XR44 shares the same 3-pin SC70-3 footprint and pinout (GND–RESET–VCC) as MAX809 variants, but differs in output type: MAX6346XR44 is push-pull active-low, while standard MAX809 is open-drain active-low. Direct replacement requires verifying that the target µP reset input tolerates push-pull drive and does not rely on wired-OR bus topology - otherwise, a pull-up resistor may float or cause contention.
MAX6346XR44 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- SC-70-3
MAX6346XR44 FAQ
1.How can I place an order for MAX6346XR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR44 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 MAX6346XR44 reliable?
The price and inventory of MAX6346XR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR44 is usually 5 days.
3.What payment methods are accepted for MAX6346XR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR44?
MAX6346XR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR44 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 MAX6346XR44?
For technical support, including MAX6346XR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR44 requirements.
6.How does Aetrix verify that MAX6346XR44 is sourced from the original manufacturer or authorized distributors?
All MAX6346XR44 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 MAX6346XR44 meets industry standards.
7.What is the process for return or replacement of MAX6346XR44?
All MAX6346XR44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR44, 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 MAX6346XR44 part is unused and in its original packaging.
Return procedure for MAX6346XR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6346XR44 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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TPS3828-33DBVR
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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
Microchip Technology
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MCP111T-300E/TT
Microchip Technology
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MCP120T-315I/TT
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MCP809T-315I/TT
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