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Analog Devices Inc./Maxim Integrated MAX6346UR33-T
- Part No.:
- MAX6346UR33-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR33-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,969
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Product details
Overview
MAX6346UR33-T from Maxim Integrated is a push-pull, active-low microprocessor supervisory circuit designed to monitor 3.3V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 3.30V reset threshold (±1.5% at +25°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates from VCC = 1.2V to 5.5V over –40°C to +85°C. It is used in portable battery-powered systems requiring reliable power-on reset functionality.
For engineers reviewing the MAX6346UR33-T datasheet, MAX6346UR33-T pinout, MAX6346UR33-T application, or MAX6346UR33-T equivalent, key selection criteria include its precise 3.3V reset threshold tolerance, push-pull output drive capability (0.3V VOL at 1.6mA), immunity to fast VCC transients, and compatibility with space-constrained SOT23-3 layouts.
Technical Context
The MAX6346UR33-T implements a precision bandgap-based reset comparator with 40ppm/°C temperature coefficient and built-in hysteresis (9.5mV) to prevent chatter near threshold. Its internal timing circuit guarantees ≥100ms reset assertion after VCC rises above VTH, independent of supply ramp rate.
As a member of the MAX6346 family, it shares the same SC70/SOT23-3 footprint and pinout as MAX6326/MAX6346 variants but is specifically trimmed to 3.30V nominal threshold and qualified for industrial temperature range (–40°C to +85°C). All logic states are guaranteed down to VCC = 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.30V ±1.5% at +25°C; ensures reliable detection of 3.3V rail collapse before µP malfunction |
| Reset Timeout | 100ms min after VCC rise; meets JEDEC JESD8-12B power-on reset hold time for 3.3V systems |
| Supply Current | 1.0µA max at +25°C; enables multi-year operation in coin-cell–powered IoT sensors |
| VCC Operating Range | 1.2V to 5.5V; supports full functionality during brownout down to 1.2V before reset deassertion |
| Output Type | Active-low push-pull; drives RESET line directly without external pull-up, sinking 1.6mA at 0.3V |
| Tempco | 40ppm/°C; limits threshold drift to ±2.5% over –40°C to +85°C, ensuring stable trip point across environment |
| Hysteresis | 9.5mV; prevents oscillation during slow or noisy VCC recovery near 3.3V |
Pinout & Package
MAX6346UR33-T is housed in a 3-pin SOT23-3 package (JEDEC TO-236AB), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and reflow assembly.
| 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; sinks 1.6mA while asserted, sources no current when deasserted |
| 3 (VCC) | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold reference; accepts 1.2V–5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.3V threshold | Factory-trimmed to 3.30V ±1.5% at +25°C, enabling direct use in 3.3V FPGA/CPU power monitoring without calibration |
| Ultra-low ICC | 1.0µA max eliminates measurable impact on battery life in always-on edge nodes |
| Transient immunity | Rejects VCC glitches <100µs wide at 3.3V–200mV overdrive, preventing false resets in noisy power environments |
| Full-voltage reset guarantee | Valid reset state maintained down to VCC = 1.2V, ensuring deterministic behavior during deep brownout |
| SOT23-3 footprint | Standardized 3-pin layout enables drop-in replacement for MAX809/MAX810 and reduces PCB real estate by >50% vs SO-8 |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
Use Scenario: Monitoring 3.3V auxiliary power rails in DIN-rail mounted programmable logic controllers where undetected brownout causes I/O misreads. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M4 host MCU until 3.3V rail stabilizes post-power-up or during AC line sag. Use Value: Prevents firmware corruption by enforcing ≥100ms reset hold time, matching the MCU's internal POR requirement and eliminating need for external RC timing. | Use Scenario: Power sequencing in wearable ECG patch with coin-cell battery and low-power BLE SoC. IC Role / Device Role / Timing Role: Reset supervisor detecting 3.3V LDO output collapse below 3.30V, holding system in reset until battery voltage recovers above threshold. Use Value: 1µA max ICC extends usable battery life beyond 2 years; push-pull output eliminates external pull-up resistor, reducing BOM count and leakage paths. |
| Network Edge Routers | Automotive Infotainment ECUs |
Use Scenario: Ensuring clean boot of dual-core MIPS processor in carrier-grade access router after 3.3V switcher transient. IC Role / Device Role / Timing Role: Voltage monitor asserting RESET during 3.3V rail dip caused by PoE surge events or hot-swap insertion. Use Value: 40ppm/°C tempco maintains ≤±2.5% threshold accuracy across chassis temperature range (–40°C to +85°C), avoiding premature or delayed reset. | Use Scenario: Validating 3.3V domain stability in head-unit application processor subsystem subject to load-dump transients. IC Role / Device Role / Timing Role: Brownout detector triggering hardware reset of i.MX6Q SoC when 3.3V supply falls below 3.30V due to alternator ripple or battery sag. Use Value: 9.5mV hysteresis prevents reset toggling during slow VCC recovery; guaranteed operation down to 1.2V ensures reset remains asserted through 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 |
|---|---|---|---|
| MAX809TR33-T | Same 3.3V threshold, but higher 10µA ICC; no guaranteed operation below 1.8V; uses same SOT23-3 package | Less suitable for sub-1.8V brownout detection or ultra-low-power battery systems | Select MAX6346UR33-T when VCC may dip below 1.8V or when <2µA supply current is mandatory |
| TPS3808G33DBVR | 3.3V threshold with 0.5% initial accuracy, but 2.5µA ICC; requires external capacitor for adjustable delay; different pinout (GND-VIN-RESET) | Not pin-compatible; adds design complexity for delay tuning and layout revision | Choose MAX6346UR33-T for fixed 100ms timeout, zero external components, and direct SOT23-3 drop-in replacement |
Compared with MAX809TR33-T and TPS3808G33DBVR, the MAX6346UR33-T delivers superior brownout robustness (1.2V operation), lower quiescent current (1µA vs 10µA/2.5µA), and guaranteed timing without external components - making it optimal for space- and power-constrained 3.3V embedded systems requiring deterministic reset behavior.
Availability
MAX6346UR33-T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical sensors, network edge routers, and automotive infotainment ECUs requiring stable component supply and long-term production continuity.
Supply support for MAX6346UR33-T 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 and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on reliability, integration, and low-power operation.
The MAX6346 series belongs to Maxim's µP supervisory product line, engineered specifically for high-accuracy, ultra-low-power reset generation in battery-operated and noise-prone digital systems using 2.5V–5V rails.
FAQ
What is the exact reset threshold voltage of the MAX6346UR33-T?
The MAX6346UR33-T has a factory-trimmed nominal reset threshold of 3.30V, with a tolerance of ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the official datasheet under suffix "R33", and applies specifically to the MAX6346UR33-T variant.
Does the MAX6346UR33-T support operation below 1.8V?
Yes, the MAX6346UR33-T is fully specified to operate down to VCC = 1.2V across –40°C to +85°C, and guarantees correct reset assertion/deassertion state at all voltages within that range. This capability is explicitly stated in the Electrical Characteristics table and distinguishes it from legacy supervisors like MAX809 that require ≥1.8V.
Is the MAX6346UR33-T pin-compatible with the MAX809 series?
Yes, the MAX6346UR33-T uses the same SOT23-3 package and identical pinout (GND–RESET–VCC) as MAX809TR33-T and MAX810TR33-T, enabling direct PCB-level replacement without layout changes. This compatibility is documented in the Pin Configuration diagram and Ordering Information table.
What is the maximum reset timeout duration of the MAX6346UR33-T?
The MAX6346UR33-T guarantees a minimum reset timeout of 100ms after VCC rises above the reset threshold, with typical values up to 185ms and a maximum of 280ms over temperature. This fixed internal timer requires no external components and is independent of VCC ramp rate or loading conditions.
Can the MAX6346UR33-T drive a standard CMOS reset input without a pull-up resistor?
Yes, the MAX6346UR33-T features a push-pull active-low RESET output capable of sinking 1.6mA while asserted (VOL ≤ 0.3V), which meets standard CMOS input low-level requirements (VIL ≤ 0.3×VDD). No external pull-up resistor is needed, simplifying design and eliminating a potential leakage path.
MAX6346UR33-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- 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
MAX6346UR33-T FAQ
1.How can I place an order for MAX6346UR33-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR33-T 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 MAX6346UR33-T reliable?
The price and inventory of MAX6346UR33-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR33-T is usually 5 days.
3.What payment methods are accepted for MAX6346UR33-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR33-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR33-T?
MAX6346UR33-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR33-T 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 MAX6346UR33-T?
For technical support, including MAX6346UR33-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR33-T requirements.
6.How does Aetrix verify that MAX6346UR33-T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR33-T 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 MAX6346UR33-T meets industry standards.
7.What is the process for return or replacement of MAX6346UR33-T?
All MAX6346UR33-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR33-T, 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 MAX6346UR33-T part is unused and in its original packaging.
Return procedure for MAX6346UR33-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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