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Analog Devices Inc./Maxim Integrated MAX6346XR43+T
- Part No.:
- MAX6346XR43+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6346XR43+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,301
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Product details
Overview
The MAX6346XR43+T from Maxim Integrated is a precision 3-pin microprocessor supervisory circuit with active-low push-pull reset output, factory-trimmed reset threshold of 4.300V (±1.5% at +25°C, ±2.5% over –40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current at 3V, and guaranteed operation down to VCC = 1.2V. It monitors 3.3V/5V digital systems in portable, industrial, and embedded controllers.
For engineers reviewing the MAX6346XR43+T datasheet, MAX6346XR43+T pinout, MAX6346XR43+T application, or MAX6346XR43+T equivalent, this device delivers deterministic power-on/power-down reset assertion for µP-based systems requiring high noise immunity, minimal quiescent current, and SC70-3 space-constrained layouts.
Technical Context
The MAX6346XR43+T uses a precision bandgap-based voltage comparator with 40ppm/°C tempco to monitor VCC against its 4.300V threshold. Reset assertion is latched and held for ≥100ms after VCC rises above threshold, independent of transient duration below threshold.
Its push-pull RESET output drives low (≤0.3V at 1.6mA sink) during reset and high (≥0.8·VCC at 500µA source) otherwise, eliminating external pull-up components. The device ignores fast negative-going VCC transients up to 200µs when overdriven by 100mV, ensuring glitch immunity in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.300V ±1.5% at +25°C; ensures reliable brownout detection for 5V systems operating near 4.3V minimum |
| Reset Timeout | 100ms minimum; guarantees µP initialization completes before release, meeting Intel-compatible reset timing |
| Supply Current | 1µA max at 3V; enables multi-year battery life in coin-cell–powered IoT sensors and portable instruments |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep brownout and full 5V rail conditions without latch-up |
| Output Type | Active-low push-pull; eliminates need for external pull-up resistor, reducing BOM count and layout area |
| Tempco | 40ppm/°C; limits threshold drift to <±11mV over –40°C to +85°C, preserving reset accuracy across temperature |
| Hysteresis | 9.5mV; prevents chatter during slow VCC recovery near threshold, improving system stability |
Pinout & Package
MAX6346XR43+T is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, suitable for high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected directly to system ground plane |
| 2 | RESET | Active-low push-pull output; asserts low during VCC undervoltage and for ≥100ms post-recovery; drives µP RESET pin directly |
| 3 | VCC | Power supply input; accepts 1.2V–5.5V; internally powers reset logic and output driver |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.300V threshold | Eliminates manual calibration; achieves ±2.5% tolerance over full industrial temperature range without external resistors |
| 100ms minimum reset timeout | Meets JEDEC JESD72B µP reset timing requirements; ensures clock stabilization and memory initialization complete before release |
| 1µA max supply current | Reduces standby power in always-on monitoring nodes; enables use with 10mAh coin cells for >10-year operation |
| SC70-3 package | Provides 40% smaller footprint than SOT23-3; fits within tight spacing constraints of wearable and handheld PCBs |
| VCC transient immunity | Rejects <200µs negative glitches at 100mV overdrive; prevents spurious resets in electrically noisy motor-control or power-supply environments |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 5V rails and EMI from nearby VFDs. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 µP during brownout events and power cycling. Use Value: 4.300V threshold aligns with 5V supply derating margin; 100ms timeout ensures FPGA configuration completes before µP boot. |
Use Scenario: Environmental sensor nodes powered by CR2032 coin cells, sampling temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Power-fail detector triggering controlled shutdown and nonvolatile register save prior to VCC collapse. Use Value: 1µA max ICC extends battery life beyond 10 years; SC70-3 footprint minimizes board area in compact enclosures. |
| Medical Infusion Pumps | Smart Energy Meters |
Use Scenario: Life-critical infusion devices using 3.3V LDOs fed from alkaline batteries, requiring fail-safe reset on voltage sag. IC Role / Device Role / Timing Role: Brownout protector holding µC in reset until regulated 3.3V rail stabilizes post-battery insertion or load step. Use Value: Guaranteed operation down to 1.2V VCC allows detection during deep discharge; push-pull output avoids pull-up leakage path. |
Use Scenario: ANSI C12.20-compliant electricity meters exposed to grid surges and neutral loss events causing 5V rail instability. IC Role / Device Role / Timing Role: Primary reset supervisor for dual-core metering SoC, coordinating secure boot and metrology calibration. Use Value: 40ppm/°C tempco maintains threshold accuracy across –25°C to +70°C meter enclosure temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR43+T | Same 4.300V threshold, identical SC70-3 package and pinout, but rated for 1.0V–5.5V VCC range (vs. 1.2V–5.5V) | Supports deeper brownout detection down to 1.0V; preferred where sub-1.2V VCC monitoring is required | Select MAX6326XR43+T only if system must assert reset below 1.2V; otherwise MAX6346XR43+T offers tighter tempco (40ppm/°C vs. 60ppm/°C) |
| TPS3808G33DBVR | 3.3V fixed threshold (not 4.3V); 350nA typical ICC; SOT23-3 package; requires external pull-up for open-drain output | Designed for 3.3V systems only; lacks 4.3V threshold needed for 5V rail supervision with safety margin | Choose TPS3808G33DBVR only for 3.3V-only applications prioritizing ultra-low ICC; MAX6346XR43+T is mandatory for 5V brownout detection at 4.3V |
Compared with MAX6326XR43+T, the MAX6346XR43+T trades 0.2V lower minimum VCC support for improved temperature stability (40ppm/°C), while TPS3808G33DBVR cannot replace it in 5V systems due to fixed 3.3V threshold and open-drain output requiring external components.
Availability
MAX6346XR43+T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, and smart energy meters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX6346XR43+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, automotive, and communications applications, with emphasis on reliability, low power, and integration.
The MAX6346XR43+T belongs to the MAX63xx family of ultra-low-power µP supervisory circuits, engineered specifically for deterministic reset generation in space-constrained, battery-sensitive, and noise-prone embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6346XR43+T and how tightly is it specified?
The MAX6346XR43+T has a factory-trimmed nominal reset threshold of 4.300V, specified as ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating temperature range. This 4.300V value is confirmed in Table 1 of the datasheet under suffix "R43", and the tolerance ensures reliable detection of 5V rail brownout while maintaining margin above typical 4.2V Li-ion charger cutoffs.
Does the MAX6346XR43+T require an external pull-up resistor on its RESET pin?
No, the MAX6346XR43+T features a push-pull active-low RESET output, meaning it actively drives both high and low states without needing an external pull-up. When reset is asserted, it sinks current to pull RESET low; when released, it sources current to drive RESET high to ≥0.8·VCC - eliminating BOM cost and layout area associated with discrete pull-ups.
What is the minimum VCC voltage at which the MAX6346XR43+T remains functional and guarantees correct reset state?
The MAX6346XR43+T is guaranteed to maintain correct reset state down to VCC = 1.2V over the full –40°C to +85°C temperature range. This is explicitly stated in the Electrical Characteristics table under "VCC Range", enabling reliable operation during deep brownout conditions where other supervisors may fail or oscillate.
How does the MAX6346XR43+T handle fast voltage transients on the VCC line?
The MAX6346XR43+T incorporates internal filtering to reject fast negative-going VCC transients: it will not generate a false reset pulse for glitches shorter than ~200µs when VCC dips 100mV below the 4.300V threshold, as shown in Figure 4 ("Maximum Transient Duration vs. Reset Threshold Overdrive"). This immunity prevents spurious resets in electrically noisy environments like motor drives or switching power supplies.
Is the MAX6346XR43+T pin-compatible with legacy Maxim reset ICs like the MAX809?
Yes, the MAX6346XR43+T is pin-compatible with the MAX809 series in the same SC70-3 package: Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC. This allows direct replacement in existing designs without PCB modification, provided the 4.300V threshold meets system requirements - unlike the MAX809's fixed 3.08V or 3.3V options.
MAX6346XR43+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.3V
- 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:
- SC-70-3
MAX6346XR43+T FAQ
1.How can I place an order for MAX6346XR43+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346XR43+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 MAX6346XR43+T reliable?
The price and inventory of MAX6346XR43+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346XR43+T is usually 5 days.
3.What payment methods are accepted for MAX6346XR43+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346XR43+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346XR43+T?
MAX6346XR43+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346XR43+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 MAX6346XR43+T?
For technical support, including MAX6346XR43+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346XR43+T requirements.
6.How does Aetrix verify that MAX6346XR43+T is sourced from the original manufacturer or authorized distributors?
All MAX6346XR43+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 MAX6346XR43+T meets industry standards.
7.What is the process for return or replacement of MAX6346XR43+T?
All MAX6346XR43+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346XR43+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 MAX6346XR43+T part is unused and in its original packaging.
Return procedure for MAX6346XR43+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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