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Analog Devices Inc./Maxim Integrated MAX6347XR40-T
- Part No.:
- MAX6347XR40-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6347XR40-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,247
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Product details
Overview
The MAX6347XR40-T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor 4.0V power supplies and assert a reset signal during brownout, power-up, and power-down events. It features a factory-trimmed 4.00V reset threshold (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered equipment requiring reliable, low-power supply monitoring.
For engineers reviewing the MAX6347XR40-T datasheet, MAX6347XR40-T pinout, MAX6347XR40-T application, or MAX6347XR40-T equivalent, key selection criteria include its active-high push-pull RESET output, SC70-3 package, guaranteed operation at VCC ≥ 1.2V, immunity to fast VCC transients, and compatibility with 4.0V nominal supply rails in space-constrained embedded systems.
Technical Context
The MAX6347XR40-T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC falling below 4.00V, triggering an active-high RESET assertion. Its internal timing circuit ensures a minimum 100ms reset pulse width after VCC recovers above threshold, with full specification across -40°C to +85°C.
It requires no external components, draws ≤1.0µA at 3V (typical 0.5µA), and features transient immunity-rejecting negative-going VCC glitches up to 200µs when overdriven by 100mV-making it suitable for noisy power environments in portable instrumentation and controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±2.5% (–40°C to +85°C); ensures reliable detection of 4.0V rail collapse without false triggers |
| Reset Timeout | 100ms min (up to 280ms); guarantees µP reset hold time meets boot initialization requirements |
| Supply Current | 1.0µA max (VCC = 3V–5.5V); enables multi-year battery life in always-on monitoring applications |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep brownout and enables use with low-voltage logic |
| Output Type | Active-high push-pull; drives high without external pull-up, simplifying interface to µP reset inputs |
| Reset Hysteresis | 9.5mV; prevents oscillation near threshold during slow VCC recovery |
| Transient Immunity | Rejects <200µs negative VCC glitches at 100mV overdrive; improves robustness in electrically noisy systems |
Pinout & Package
MAX6347XR40-T 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection |
| 2 | RESET | Active-high push-pull output; drives high during fault condition and low otherwise; sinks/source capability per spec |
| 3 | VCC | Power supply input; monitors this rail for reset generation; functional down to 1.2V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.00V threshold | Eliminates external resistor networks and calibration; reduces BOM count and layout area |
| 100ms minimum reset timeout | Guarantees sufficient hold time for all common µP/µC boot sequences without external timing components |
| 1.2V minimum VCC operation | Enables supervision during deep brownout conditions where other supervisors fail, improving system safety |
| SC70-3 package | Reduces PCB footprint by ~40% vs. SOT23-3; ideal for wearables and handheld medical devices |
| Transient-immune comparator | Prevents spurious resets from switching noise or ESD-induced supply dips, increasing field reliability |
Applications
| Battery-Powered Data Loggers | Industrial Sensor Nodes |
|---|---|
Use Scenario: Long-term environmental monitoring using coin-cell or Li-ion batteries with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to hold µC in reset until stable 4.0V rail is established post-wake. Use Value: 1µA max ICC extends battery life beyond 10 years; 1.2V VCC operation ensures reset remains valid even as battery discharges to endpoint. | Use Scenario: Wireless temperature/pressure sensors deployed in factory automation with 4.0V regulated supply. IC Role / Device Role / Timing Role: Power-supply monitor detecting undervoltage on 4.0V rail caused by cable drop or regulator failure. Use Value: 4.00V ±2.5% threshold matches typical 4.0V LDO tolerance; 100ms timeout prevents nuisance resets during brief line transients. |
| Portable Medical Instruments | Programmable Logic Controllers (PLCs) |
Use Scenario: Handheld glucose meters or pulse oximeters powered by single-cell Li-ion (nominal 3.7V, charged to 4.2V). IC Role / Device Role / Timing Role: Ensures µC only exits reset when 4.0V rail is within safe operating window, preventing corrupted memory writes. Use Value: Active-high push-pull output directly interfaces with ARM Cortex-M reset pins; no pull-up required saves board space and leakage risk. | Use Scenario: Modular I/O modules in industrial PLC backplanes supplied from 4.0V distributed bus. IC Role / Device Role / Timing Role: Brownout detector that initiates controlled shutdown sequence upon sustained 4.0V rail sag due to overload or aging PSU. Use Value: 9.5mV hysteresis prevents chatter during marginal rail recovery; SC70-3 package fits dense carrier board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327XR40-T | Same 4.00V threshold, identical SC70-3 package and active-high push-pull output; differs only in production batch and marking code (FZBQ vs. FMAA) | No functional difference; both qualified for same industrial temp range and electrical specs | Select MAX6327XR40-T if MAX6347XR40-T is out of stock; fully interchangeable in design |
| TPS3124E18DBVR | Active-high open-drain output; 1.8V fixed threshold; 1.6µA max ICC; SOT23-3 package | Requires external pull-up; lower threshold unsuitable for 4.0V rail monitoring; higher ICC reduces battery life | Only consider if redesigning for 1.8V systems; not a direct replacement for 4.0V supervision |
Compared with MAX6327XR40-T (identical function, alternate marking), MAX6347XR40-T offers identical performance and drop-in compatibility; versus TPS3124E18DBVR, it provides correct 4.0V threshold, lower ICC, and push-pull drive-critical for minimizing component count and maximizing battery runtime in 4V-powered portable systems.
Availability
MAX6347XR40-T is available at Aetrix Electronics and suitable for portable medical instruments, industrial sensor nodes, battery-powered data loggers, and programmable logic controller modules requiring stable component supply and long-lifecycle support.
Supply support for MAX6347XR40-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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX63xx family delivers ultra-low-power, pin-compatible µP supervisors targeting battery-operated and space-constrained embedded systems requiring reliable, maintenance-free power monitoring.
FAQ
What is the exact reset threshold voltage of the MAX6347XR40-T and how tightly is it specified?
The MAX6347XR40-T has a factory-trimmed nominal reset threshold of 4.00V. Over the full operating temperature range of –40°C to +85°C, this threshold is guaranteed to remain within ±2.5% of 4.00V (i.e., 3.90V to 4.10V). At +25°C, the tolerance tightens to ±1.5%, ensuring high accuracy during bench validation and production testing of the MAX6347XR40-T.
Does the MAX6347XR40-T require any external components to operate?
No, the MAX6347XR40-T requires zero external components. Its precision voltage reference, comparator, and timing circuitry are fully integrated. The device asserts RESET based solely on VCC level and internal timing-no capacitors, resistors, or diodes are needed. This integration reduces bill-of-materials cost, PCB area, and potential failure points, making the MAX6347XR40-T ideal for compact, high-reliability designs.
How does the MAX6347XR40-T behave when VCC drops below 1.2V?
The MAX6347XR40-T is fully specified to operate down to VCC = 1.2V. Below this voltage, the device enters an undefined state: RESET output behavior is not guaranteed, and internal circuitry may cease functioning. However, the datasheet confirms correct reset assertion and release down to 1.2V, meaning the MAX6347XR40-T will reliably hold RESET asserted during brownout until VCC falls below 1.2V-providing maximum safety margin before system collapse.
Is the MAX6347XR40-T pin-compatible with older Maxim supervisors like the MAX809?
Yes, the MAX6347XR40-T is pin-compatible with the MAX809 series in SC70-3 and SOT23-3 packages. Pin 1 = GND, Pin 2 = RESET (active-high push-pull), Pin 3 = VCC-matching the MAX809's pinout. However, the MAX6347XR40-T offers superior specs: 1µA vs. 20µA supply current, tighter threshold tolerance, and enhanced transient immunity. Migration to MAX6347XR40-T requires no PCB changes.
What is the maximum allowable negative transient on VCC that the MAX6347XR40-T can ignore without asserting reset?
At a 100mV overdrive (i.e., VCC = 3.90V when threshold = 4.00V), the MAX6347XR40-T can ignore negative transients up to 200µs in duration without generating a false reset. As the overdrive increases (e.g., VCC = 3.80V), the maximum tolerable glitch width decreases per the "Maximum Transient Duration vs. Reset Threshold Overdrive" curve in the datasheet. This immunity prevents spurious resets from switching noise, making the MAX6347XR40-T robust in electrically harsh environments.
MAX6347XR40-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:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6347XR40-T FAQ
1.How can I place an order for MAX6347XR40-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6347XR40-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 MAX6347XR40-T reliable?
The price and inventory of MAX6347XR40-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6347XR40-T is usually 5 days.
3.What payment methods are accepted for MAX6347XR40-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6347XR40-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6347XR40-T?
MAX6347XR40-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6347XR40-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 MAX6347XR40-T?
For technical support, including MAX6347XR40-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6347XR40-T requirements.
6.How does Aetrix verify that MAX6347XR40-T is sourced from the original manufacturer or authorized distributors?
All MAX6347XR40-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 MAX6347XR40-T meets industry standards.
7.What is the process for return or replacement of MAX6347XR40-T?
All MAX6347XR40-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6347XR40-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 MAX6347XR40-T part is unused and in its original packaging.
Return procedure for MAX6347XR40-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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