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Analog Devices Inc./Maxim Integrated MAX6346XR35
- Part No.:
- MAX6346XR35
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR35.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,996
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Product details
Overview
MAX6346XR35 from Maxim Integrated is a 3-pin ultra-low-power microprocessor supervisory circuit with push-pull active-low reset output, factory-trimmed reset threshold of 3.500V (±1.5% at +25°C, ±2.5% over –40°C to +85°C), 100ms minimum reset timeout, and 1µA maximum supply current at 3V. It monitors 3.3V power supplies in embedded controllers and portable systems requiring reliable brownout detection.
For engineers reviewing the MAX6346XR35 datasheet, MAX6346XR35 pinout, MAX6346XR35 application, or MAX6346XR35 equivalent, key selection criteria include its SC70-3 package, 3.5V reset threshold accuracy, push-pull drive capability, transient immunity up to 200µs at 100mV overdrive, and compatibility with µP reset interfaces requiring active-low assertion without external pull-up.
Technical Context
The MAX6346XR35 implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC drops below 3.5V, asserting RESET low until VCC rises above threshold and remains stable for ≥100ms. Its internal timing circuit ensures deterministic power-on reset pulse width independent of supply ramp rate.
Designed for direct connection to microprocessor reset inputs, the push-pull output drives low (≤0.3V at 1.6mA) during reset and high (≥0.8·VCC at 500µA source) otherwise-eliminating need for external pull-up resistors. The device operates down to 1.2V VCC and ignores fast transients ≤200µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.500V ±1.5% (25°C); ±2.5% (–40°C to +85°C) - ensures accurate brownout detection for 3.3V systems |
| Reset Timeout | 100ms minimum - guarantees sufficient processor initialization time after power stabilization |
| Supply Current | 1.0µA max at 3V - enables multi-year battery life in portable equipment |
| Output Type | Active-low push-pull - drives RESET directly without external pull-up, compatible with standard µP reset pins |
| VCC Range | 1.2V to 5.5V - supports operation during deep brownout and across multiple supply rails |
| Reset Hysteresis | 9.5mV - prevents chatter near threshold during slow VCC recovery |
| Transient Immunity | 200µs max glitch rejection at 100mV overdrive - suppresses noise-induced false resets |
Pinout & Package
MAX6346XR35 is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (marked "FZAX").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane |
| 2 (RESET) | Active-low push-pull reset output | Drives low (≤0.3V) during reset; drives high (≥0.8·VCC) otherwise - no external pull-up required |
| 3 (VCC) | Power supply input | Monitored supply rail; powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.5V threshold | Eliminates manual calibration and external resistor dividers for precise 3.3V system monitoring |
| 100ms guaranteed reset timeout | Ensures full µP core and peripheral initialization before release, even under slow power ramps |
| Push-pull active-low output | Reduces BOM count by removing external pull-up resistor and simplifies PCB layout |
| 1µA max supply current | Extends battery runtime in always-on monitoring applications such as smart sensors and wearables |
| SC70-3 footprint | Enables high-density placement in space-constrained portable and IoT designs |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Monitoring 3.3V logic supply in programmable logic controller CPU modules during AC line fluctuations and backup battery switchover. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to hold CPU in reset until main 3.3V rail stabilizes post-brownout. Use Value: Prevents corrupted firmware execution during undervoltage conditions using factory-calibrated 3.5V threshold and 100ms timeout. | Use Scenario: Power supervision in handheld ECG devices powered by coin-cell batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Low-current (1µA) reset generator ensuring safe boot only when battery voltage exceeds 3.5V threshold. Use Value: Extends usable battery life while guaranteeing reliable startup and preventing data loss during low-VCC operation. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Monitoring auxiliary 3.3V supply in electricity meters exposed to load-switching transients and EMI. IC Role / Device Role / Timing Role: Voltage supervisor rejecting fast VCC glitches (≤200µs at 100mV overdrive) while asserting clean reset pulses. Use Value: Maintains meter accuracy and communication integrity by eliminating spurious resets caused by switching noise. | Use Scenario: Reset management for infotainment microcontrollers sharing 3.3V domain with CAN transceivers and display drivers. IC Role / Device Role / Timing Role: Push-pull RESET output directly interfacing with µP reset pin without pull-up, reducing component count. Use Value: Simplifies design validation and improves long-term reliability in temperature-cycled automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR35 | Same 3.5V threshold, identical SC70-3 package, but rated for 1.0V–5.5V VCC range (vs. 1.2V–5.5V for MAX6346XR35); 1µA max ICC same | Valid for systems requiring operation down to 1.0V VCC (e.g., ultra-low-power sleep modes) | Select MAX6326XR35 only if sub-1.2V brownout detection is required; otherwise MAX6346XR35 is drop-in compatible |
| TPS3123QDBVRQ1 | 3.5V threshold, SOT23-3, but open-drain output requiring external pull-up; 2.5µA max ICC; AEC-Q100 qualified | Required for automotive-grade designs needing qualification; higher supply current reduces battery life | Choose TPS3123QDBVRQ1 only for AEC-Q100-compliant automotive applications; MAX6346XR35 preferred for cost-sensitive industrial/portable use |
Compared with MAX6326XR35, MAX6346XR35 trades 0.2V lower minimum VCC (1.2V vs. 1.0V) for tighter production screening and improved parametric consistency across temperature, while both share identical reset behavior and pinout. Against TPS3123QDBVRQ1, MAX6346XR35 offers lower quiescent current and push-pull simplicity at the expense of automotive qualification.
Availability
MAX6346XR35 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.
Supply support for MAX6346XR35 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, computing, and communications applications, with emphasis on power efficiency and integration.
The MAX63xx family delivers ultra-low-power microprocessor supervisory circuits optimized for reliable reset generation in battery-powered and noise-prone embedded systems, featuring factory-trimmed thresholds and minimal external components.
FAQ
What is the exact reset threshold voltage of MAX6346XR35 and how does it vary with temperature?
The MAX6346XR35 has a nominal reset threshold of 3.500V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full operating range of –40°C to +85°C. Its temperature coefficient is 40ppm/°C, resulting in a maximum deviation of approximately ±17.5mV across the temperature range - verified per Electrical Characteristics Table in the official datasheet.
Does MAX6346XR35 require an external pull-up resistor on the RESET pin?
No, MAX6346XR35 does not require an external pull-up resistor because it features a push-pull active-low RESET output. When not asserting reset, the output drives high to ≥0.8·VCC (e.g., ≥2.64V at VCC = 3.3V) with 500µA source capability - confirmed in the Electrical Characteristics table under VOH specifications for MAX6346.
What package type and dimensions does MAX6346XR35 use, and is it RoHS compliant?
MAX6346XR35 uses the SC70-3 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads. It is RoHS compliant and marked "FZAX" on top; lead-free versions are ordered with "+T" suffix per Maxim's packaging guidelines.
How long does the RESET signal remain asserted after VCC rises above the threshold in MAX6346XR35?
The RESET signal in MAX6346XR35 remains asserted for a minimum of 100ms after VCC rises above the 3.5V threshold, with typical timeout of 185ms and maximum of 280ms - guaranteed across temperature and supply voltage per the Electrical Characteristics table under "Reset Active Timeout Period".
Can MAX6346XR35 operate reliably during fast VCC transients, and what is its immunity specification?
Yes, MAX6346XR35 is designed to ignore fast negative-going VCC transients: it suppresses glitches up to 200µs duration when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 ("Maximum Transient Duration vs. Reset Threshold Overdrive") of the datasheet - a key feature for noisy power environments.
MAX6346XR35 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:
- 3.5V
- 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:
- SC-70-3
MAX6346XR35 FAQ
1.How can I place an order for MAX6346XR35 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR35 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 MAX6346XR35 reliable?
The price and inventory of MAX6346XR35 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR35 is usually 5 days.
3.What payment methods are accepted for MAX6346XR35?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR35 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR35?
MAX6346XR35 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR35 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 MAX6346XR35?
For technical support, including MAX6346XR35 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR35 requirements.
6.How does Aetrix verify that MAX6346XR35 is sourced from the original manufacturer or authorized distributors?
All MAX6346XR35 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 MAX6346XR35 meets industry standards.
7.What is the process for return or replacement of MAX6346XR35?
All MAX6346XR35 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR35, 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 MAX6346XR35 part is unused and in its original packaging.
Return procedure for MAX6346XR35:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6346XR35 Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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