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Analog Devices Inc./Maxim Integrated MAX6347UR44-T
- Part No.:
- MAX6347UR44-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6347UR44-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,145
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Product details
Overview
MAX6347UR44-T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when VCC falls below 4.38V (±2.5% over temperature), maintaining reset for ≥100ms after VCC recovers; it operates from 1.2V to 5.5V, draws ≤1µA supply current, and is housed in a 3-pin SOT23 package for use in portable battery-powered systems and embedded controllers.
For engineers reviewing the MAX6347UR44-T datasheet, MAX6347UR44-T pinout, MAX6347UR44-T application, or MAX6347UR44-T equivalent, this page delivers verified electrical parameters, confirmed active-high push-pull output behavior, factory-trimmed 4.38V reset threshold, guaranteed operation down to 1.2V VCC, and validated compatibility with critical µP power-monitoring designs requiring ultra-low quiescent current and transient immunity.
Technical Context
The MAX6347UR44-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 9.5mV hysteresis, ensuring stable threshold detection across -40°C to +85°C. Its internal logic guarantees correct reset state down to 1.2V VCC and ignores fast transients via built-in glitch rejection.
It features a push-pull RESET output capable of sourcing ≥500µA at 0.8·VCC while asserted, and sinking up to 1.2mA when deasserted - eliminating external pull-up components. The device requires no external capacitors or resistors and is fully specified without load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 4.5V nominal supplies |
| Supply Current | ≤1.0µA at 3V - enables multi-year battery life in always-on portable equipment |
| Reset Timeout | 100ms minimum power-on reset pulse - meets µP initialization timing requirements |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and full-system power sequencing |
| Output Type | Active-high push-pull - drives reset lines directly without external pull-up resistor |
| Reset Hysteresis | 9.5mV - prevents chatter during slow VCC recovery near threshold |
| Transient Immunity | Rejects VCC glitches <100µs at 200mV overdrive - avoids false resets in noisy environments |
Pinout & Package
MAX6347UR44-T is packaged in a RoHS-compliant 3-pin SOT23-3 (U3-1) surface-mount package with 0.95mm pitch and JEDEC MO-178AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-high push-pull reset output | Drives high during reset assertion (VCC < 4.38V) and low otherwise; compatible with µP reset inputs requiring active-high logic |
| 3 (VCC) | Supply input | Power source for internal circuitry; accepts 1.2V–5.5V; includes ESD protection to ±6V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables integration into energy-harvesting and coin-cell-powered systems without compromising runtime |
| Precision threshold trim | Factory-set 4.38V (±2.5%) eliminates manual calibration and reduces BOM count |
| Push-pull RESET | Eliminates need for external pull-up resistor, reducing PCB area and assembly cost |
| Wide VCC range | 1.2V minimum operation supports reset assertion during deep undervoltage events before system shutdown |
| Transient immunity | Guaranteed non-response to VCC glitches under 100µs duration prevents spurious resets in electrically noisy applications |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Microcontroller-based programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 5V rails. IC Role / Device Role / Timing Role: Supervises 5V VCC rail and asserts active-high RESET to hold µP in reset until stable power is confirmed post-power-up or brownout recovery. Use Value: Prevents erratic firmware execution during unstable supply conditions using guaranteed 100ms timeout and 4.38V threshold aligned with 5V system margin. |
Use Scenario: Battery-powered ECG or SpO₂ monitors requiring multi-year operation on CR2032 cells with dynamic load switching. IC Role / Device Role / Timing Role: Monitors declining battery voltage and triggers controlled shutdown sequence via active-high RESET signal to main µP before brownout. Use Value: Enables graceful state preservation using ultra-low 1µA supply current and precise 4.38V threshold to maximize usable battery capacity. |
| Smart Energy Meters | Automated Test Equipment |
Use Scenario: Revenue-grade electricity meters exposed to wide ambient temperatures (-40°C to +85°C) and conducted EMI. IC Role / Device Role / Timing Role: Provides robust power-on reset and brownout detection for metrology µP, rejecting line transients via built-in glitch immunity. Use Value: Ensures deterministic boot behavior across temperature extremes with ±2.5% threshold accuracy and 40ppm/°C tempco. |
Use Scenario: Benchtop test instruments with FPGA-based control logic requiring clean, jitter-free reset initiation after AC power cycling. IC Role / Device Role / Timing Role: Generates monotonic, noise-immune reset pulse synchronized to 5V rail stabilization, interfacing directly with FPGA reset pins. Use Value: Delivers push-pull drive strength sufficient to meet FPGA reset timing budgets without external buffering or RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UR44-T | Same 4.38V threshold and active-high push-pull output, but belongs to MAX632x series with identical specs except packaging marking code | No functional difference; shares same SC70/SOT23 footprint and electrical behavior | Select MAX6327UR44-T only if SC70-3 package required; MAX6347UR44-T is SOT23-3 with identical performance |
| TPS3124E18DBVR | 1.8V fixed threshold, 360ms reset timeout, 2.5µA ICC - not adjustable, longer timeout, higher current | Suitable for 1.8V logic domains only; incompatible for 4.38V monitoring or ultra-low-power designs | Choose only for 1.8V systems where extended reset duration is acceptable and 1µA current is not critical |
Compared with MAX6327UR44-T, MAX6347UR44-T offers identical functionality in SOT23-3 with optimized tape-and-reel logistics; versus TPS3124E18DBVR, it provides precise 4.38V detection, 100ms timeout, and 1µA current essential for 5V portable and industrial applications.
Availability
MAX6347UR44-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, automated test equipment, and battery-backed embedded systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6347UR44-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 consumer applications, with expertise in power management and sensor interfaces.
The MAX6347UR44-T belongs to the MAX63xx family of ultra-low-power µP supervisors, engineered specifically for reliable power monitoring in space-constrained, battery-sensitive, and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6347UR44-T?
The MAX6347UR44-T has a factory-trimmed reset threshold of 4.38V, with tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during production and documented in Table 1 of the official datasheet; the "R44" suffix explicitly denotes the 4.38V variant within the MAX6347 family.
Does the MAX6347UR44-T require an external pull-up resistor on its RESET pin?
No, the MAX6347UR44-T features an active-high push-pull RESET output, meaning it actively drives both high and low states without needing an external pull-up resistor. When asserted (VCC < 4.38V), RESET outputs ≥0.8·VCC; when deasserted, it sinks up to 1.2mA at ≤0.4V - enabling direct interface with µP reset inputs.
What is the minimum VCC voltage at which the MAX6347UR44-T remains functional?
The MAX6347UR44-T is guaranteed to maintain correct reset state down to 1.2V VCC over the full -40°C to +85°C temperature range. Below 1.2V, the device may not assert reset reliably; however, its internal circuitry remains latched in known state, preventing indeterminate output behavior during deep brownout conditions.
How does the MAX6347UR44-T handle short voltage transients on the VCC line?
The MAX6347UR44-T incorporates inherent transient immunity: it ignores negative-going VCC glitches shorter than 100µs when the overdrive (VTH – VCC) is 200mV, per the Typical Operating Characteristics graph. This design prevents false resets caused by switching noise or ESD-induced supply dips, making it suitable for electrically harsh environments.
Is the MAX6347UR44-T pin-compatible with older Maxim supervisors like the MAX809?
Yes, the MAX6347UR44-T is pin-compatible with the MAX809 series in SOT23-3 package, sharing identical pinout (VCC, RESET, GND) and footprint. However, it differs in output polarity (active-high vs. MAX809's active-low) and threshold accuracy (±2.5% vs. ±2.0%), so firmware-level reset logic must account for active-high signaling.
MAX6347UR44-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:
- 4.4V
- 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:
- SOT-23-3
MAX6347UR44-T FAQ
1.How can I place an order for MAX6347UR44-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6347UR44-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 MAX6347UR44-T reliable?
The price and inventory of MAX6347UR44-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6347UR44-T is usually 5 days.
3.What payment methods are accepted for MAX6347UR44-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6347UR44-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6347UR44-T?
MAX6347UR44-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6347UR44-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 MAX6347UR44-T?
For technical support, including MAX6347UR44-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6347UR44-T requirements.
6.How does Aetrix verify that MAX6347UR44-T is sourced from the original manufacturer or authorized distributors?
All MAX6347UR44-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 MAX6347UR44-T meets industry standards.
7.What is the process for return or replacement of MAX6347UR44-T?
All MAX6347UR44-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6347UR44-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 MAX6347UR44-T part is unused and in its original packaging.
Return procedure for MAX6347UR44-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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