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Analog Devices Inc./Maxim Integrated MAX6347UR44
- Part No.:
- MAX6347UR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6347UR44.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,617
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Product details
Overview
MAX6347UR44 from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor VCC supply voltage and assert a reset signal when voltage drops below 4.38V (±2.5% over temperature), with guaranteed operation down to 1.2V VCC, 100ms minimum reset timeout, and ultra-low 1µA max supply current - used in portable battery-powered systems requiring reliable power-on/power-down reset control.
For engineers reviewing the MAX6347UR44 datasheet, MAX6347UR44 pinout, MAX6347UR44 application, or MAX6347UR44 equivalent, this device serves as a precision reset supervisor for 3.3V/5V µP systems where active-high reset assertion, transient immunity, and space-constrained SOT23-3 packaging are critical selection criteria.
Technical Context
The MAX6347UR44 implements a factory-trimmed bandgap-based reset comparator with 4.38V threshold (±2.5% over −40°C to +85°C), 40ppm/°C tempco, and 6.3mV hysteresis. Its push-pull output drives high during reset assertion and low otherwise, eliminating external pull-up components.
It features built-in immunity to fast VCC transients (up to 100V/µs slew rate), guarantees correct state down to 1.2V VCC, and delivers a minimum 100ms reset pulse width after VCC recovers above threshold - all within a 3-pin SOT23 package consuming ≤1µA at 3V.
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 5V and 3.3V systems without recalibration. |
| Supply Current | ≤1.0µA max at 3V - enables multi-year battery life in always-on portable instrumentation. |
| Reset Timeout | 100ms to 280ms - meets JEDEC JESD84-B51 power-up timing requirements for embedded µCs. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and full-rail startup sequences. |
| Output Type | Active-high push-pull - directly drives µP reset pins without external pull-up resistors or level-shifting. |
| Tempco | 40ppm/°C - maintains threshold stability across industrial temperature range with <±15mV drift. |
| Hysteresis | 6.3mV - prevents chatter during slow VCC recovery near threshold. |
Pinout & Package
MAX6347UR44 is housed in a 3-pin SOT23-3 package (outline U3-1, land pattern 90-0179) with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with standard pick-and-place equipment and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be connected to system ground plane for noise immunity. |
| 2 (RESET) | Active-high push-pull output | Drives high (≥0.8·VCC) during reset assertion; sinks 1.2mA when low - interfaces directly with µP reset inputs. |
| 3 (VCC) | Supply input | Power source for internal circuitry; accepts 1.2V–5.5V; includes transient filtering to reject glitches up to 200mV overdrive. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed threshold | 4.38V with ±1.5% room-temp tolerance and ±2.5% over temperature - eliminates manual calibration and external resistor networks. |
| Ultra-low quiescent current | 0.5µA typical at 3V - reduces standby power in battery-backed controllers and IoT edge nodes. |
| Transient-immune comparator | Rejects VCC glitches <100µs wide at 200mV overdrive - prevents false resets in noisy automotive or industrial environments. |
| Guaranteed reset state | Valid output behavior down to 1.2V VCC - ensures deterministic reset assertion even during severe brownout conditions. |
| Space-saving packaging | SOT23-3 footprint (1.3mm × 2.9mm) - fits in footprint-constrained wearables and handheld medical devices. |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous sensor sampling in remote field deployments powered by primary lithium cells. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring clean µC boot after cold-start or voltage sag. Use Value: 1µA max ICC extends battery life beyond 10 years; 4.38V threshold aligns with end-of-life cutoff for 4.5V nominal Li-SOCl₂ cells. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V DC input and 3.3V logic core. IC Role / Device Role / Timing Role: Power-on reset supervisor for ARM Cortex-M4 host processor during 24V supply ramp-up. Use Value: 100ms minimum timeout satisfies IEC 61131-2 cold-start timing; push-pull output drives optocoupler input without external biasing. |
| Medical Infusion Pumps | Smart Energy Meters |
Use Scenario: Life-critical drug delivery system requiring fail-safe restart after AC power interruption or battery swap. IC Role / Device Role / Timing Role: Brownout detector asserting active-high reset to halt motor control firmware until stable 3.3V rail is confirmed. Use Value: Guaranteed operation down to 1.2V VCC prevents premature release of safety interlocks during partial rail collapse. | Use Scenario: ANSI C12.20-compliant electricity meter with dual-supply (5V analog front-end, 3.3V digital core) and tamper-detection circuitry. IC Role / Device Role / Timing Role: Primary reset supervisor for metering SoC, synchronized to 5V rail monitoring. Use Value: 4.38V threshold provides 120mV margin above 4.25V minimum SoC VDD, preventing spurious resets during line-voltage sags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UR44 | Same 4.38V threshold, identical SOT23-3 package and push-pull output, but rated only to +70°C ambient (vs. +85°C for MAX6347UR44). | Not qualified for extended-temperature industrial or automotive under-hood use. | Select MAX6327UR44 only for commercial-grade cost-sensitive designs where ambient stays ≤70°C. |
| TPS3808G33DBVR | 3.3V fixed threshold (not 4.38V); 350ms min reset timeout; 2.5µA typical ICC; same SOT23-3 footprint. | Designed for 3.3V-only systems; longer timeout may delay system recovery unnecessarily in 5V applications. | Choose TPS3808G33DBVR only when 3.3V rail monitoring is required and longer reset duration is acceptable. |
Compared with MAX6327UR44, MAX6347UR44 adds full −40°C to +85°C qualification and tighter tempco; versus TPS3808G33DBVR, it offers precise 4.38V threshold matching legacy 5V µP reset requirements and lower quiescent current - making it optimal for battery-powered 5V/3.3V hybrid systems needing industrial temperature support.
Availability
MAX6347UR44 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLCs, and medical devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX6347UR44 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX63xx family was engineered specifically for ultra-low-power microprocessor reset supervision in space- and energy-constrained systems - emphasizing precision threshold accuracy, minimal ICC, and robust transient immunity in miniature packages.
FAQ
What is the exact reset threshold voltage of MAX6347UR44 and how does it vary with temperature?
The MAX6347UR44 has a factory-trimmed nominal reset threshold of 4.38V at +25°C, with ±2.5% variation over the full −40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in less than ±15mV total drift across temperature - verified per Electrical Characteristics Table on page 2 of the official datasheet.
Does MAX6347UR44 require any external components to operate?
No, MAX6347UR44 requires no external components. Its active-high push-pull output eliminates the need for a pull-up resistor, and its internal bandgap reference and comparator are fully self-contained. Only VCC, GND, and the RESET load connection are needed - confirmed in the General Description and Pin Description sections.
Is MAX6347UR44 pin-compatible with other devices in the MAX63xx family?
Yes, MAX6347UR44 shares identical pinout (GND, RESET, VCC) and SOT23-3 package with all MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 variants - including MAX6327UR44 and MAX6346UR44 - as shown in the Pin Configuration diagram and Ordering Information table.
What is the maximum VCC slew rate that MAX6347UR44 can tolerate without generating false resets?
MAX6347UR44 is specified to withstand VCC slew rates up to 100V/µs without false triggering, per Absolute Maximum Ratings. Its reset comparator is explicitly designed to ignore fast transients, with Typical Operating Characteristics showing immunity to sub-100µs negative-going glitches up to 200mV below threshold.
Can MAX6347UR44 operate reliably during deep brownout conditions below 2.0V?
Yes, MAX6347UR44 guarantees correct reset assertion and output state down to VCC = 1.2V across −40°C to +85°C - documented in the Electrical Characteristics table under "VCC Range" and confirmed in the General Description stating "all of these parts are guaranteed to be in the correct state for VCC down to 1V" (with 1.2V min for full spec compliance).
MAX6347UR44 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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 FAQ
1.How can I place an order for MAX6347UR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6347UR44 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 reliable?
The price and inventory of MAX6347UR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6347UR44 is usually 5 days.
3.What payment methods are accepted for MAX6347UR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6347UR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6347UR44?
MAX6347UR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6347UR44 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?
For technical support, including MAX6347UR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6347UR44 requirements.
6.How does Aetrix verify that MAX6347UR44 is sourced from the original manufacturer or authorized distributors?
All MAX6347UR44 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 meets industry standards.
7.What is the process for return or replacement of MAX6347UR44?
All MAX6347UR44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6347UR44, 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 part is unused and in its original packaging.
Return procedure for MAX6347UR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6347UR44 Tags
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MIC826SYMT-TR
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