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Analog Devices Inc./Maxim Integrated MAX6346UR38
- Part No.:
- MAX6346UR38
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR38.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,476
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Product details
Overview
MAX6346UR38 from Maxim Integrated is a push-pull, active-low microprocessor supervisory circuit designed to monitor 3.8V power supplies in embedded systems. It asserts reset when VCC falls below 3.800V (±2.5% over temperature), holds reset for ≥100ms after VCC recovers, draws ≤1.0µA supply current at 3.2V, and operates from -40°C to +85°C in SOT23-3 packaging - used in portable battery-powered µP systems requiring reliable brownout protection.
For engineers reviewing the MAX6346UR38 datasheet, MAX6346UR38 pinout, MAX6346UR38 application, or MAX6346UR38 equivalent, this page delivers verified reset threshold accuracy, push-pull output drive capability, transient immunity specs, and direct substitution guidance against industry-standard supervisory ICs.
Technical Context
The MAX6346UR38 implements a precision bandgap-based reset comparator with factory-trimmed 3.800V threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C) and 9.5mV hysteresis. Its internal timing circuit guarantees minimum 100ms reset timeout after power-up, independent of VCC slew rate.
It features ultra-low quiescent current (≤1.0µA at 3.2V), operates down to 1.2V VCC, and rejects fast transients via built-in noise immunity - confirmed by maximum transient duration vs. overdrive curves showing <200µs rejection for 100mV VTH–VCC overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.800V ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 3.8V nominal rails |
| Reset Timeout | 100ms to 280ms - guarantees sufficient hold time for µP initialization before release |
| Supply Current | ≤1.0µA at 3.2V - enables multi-year operation in coin-cell–powered devices |
| Output Type | Active-low push-pull - drives RESET directly without external pull-up, sinks 1.6mA min |
| VCC Range | 1.2V to 5.5V - supports operation during deep brownout and full supply range |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
| Tempco | 40ppm/°C - maintains threshold stability across industrial temperature range |
Pinout & Package
SOT23-3 package: 2.92mm × 1.3mm body, 0.95mm height, gull-wing leads, RoHS-compliant lead-free option available (replace "-T" with "+T").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output stage - must be low-impedance connection |
| 2 | RESET | Active-low push-pull output - drives µP RESET pin directly; sinks ≥1.6mA at 0.3V |
| 3 | VCC | Supply input - powers internal circuitry and defines reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-trimmed threshold | 3.800V with ±2.5% tolerance over full temperature range - eliminates manual calibration |
| Ultra-low supply current | ≤1.0µA at 3.2V - extends battery life in portable instrumentation |
| Power-on reset timeout | Guaranteed ≥100ms - meets ARM Cortex-M and PIC µP reset timing requirements |
| VCC transient immunity | Rejects <200µs negative glitches at 100mV overdrive - prevents false resets in noisy environments |
| No external components | Self-contained reset generation - reduces BOM count and board area vs. RC-based solutions |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG and pulse oximeter units operating on single Li-ion cells with variable VCC during discharge. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M4 until stable 3.3V/3.8V rail is established post-power-up. Use Value: Prevents firmware execution during undervoltage conditions using guaranteed 100ms timeout and 3.800V threshold aligned to system brownout margin. | Use Scenario: DIN-rail mounted PLC modules exposed to 24V DC supply ripple and cold-start conditions. IC Role / Device Role / Timing Role: Power-monitoring device holding µP in reset during 24V-to-3.3V LDO startup transients and line sags. Use Value: Ensures deterministic boot sequence via 40ppm/°C tempco and 9.5mV hysteresis - eliminating spurious resets under thermal cycling. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: Revenue-grade electricity meters with dual-supply architecture (main AC-DC + backup supercap). IC Role / Device Role / Timing Role: Reset supervisor monitoring 3.8V backup rail, asserting RESET during supercap voltage decay below safe operating level. Use Value: Enables fail-safe shutdown using 1.2V minimum VCC operation and 3.800V precise threshold - preserving meter state integrity. | Use Scenario: 12V automotive subsystems (e.g., door module) powered through buck converter with 3.8V intermediate rail. IC Role / Device Role / Timing Role: Brownout detector interfacing with Infineon AURIX TC3xx µP via push-pull RESET pin. Use Value: Delivers glitch-immune reset signaling with ≤1.0µA current draw - critical for always-on vehicle networks meeting ISO 16750-2 load-dump immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR38D3T | Same 3.8V threshold, SOT23-3, but higher 2.5µA max ICC and no guaranteed 1.2V VCC operation | Limited to commercial temp range (0°C to +70°C); not rated for extended industrial use | Select MAX809TR38D3T only for cost-sensitive consumer designs where ultra-low current and extended temperature are non-critical |
| TPS3808G38DBVR | 3.8V threshold, 1.6µA max ICC, but open-drain output requiring external pull-up resistor | Requires additional 47kΩ pull-up; incompatible with µPs needing push-pull drive without external logic | Choose TPS3808G38DBVR when system already uses open-drain reset buses or requires adjustable delay via capacitor |
Compared with MAX809TR38D3T and TPS3808G38DBVR, the MAX6346UR38 provides lower supply current, wider VCC operating range (1.2V–5.5V), and true push-pull output - making it optimal for battery-constrained, wide-temperature, and direct-drive µP applications.
Availability
MAX6346UR38 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6346UR38 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 markets.
The MAX6346UR38 belongs to the MAX6326/MAX6346 family of ultra-low-power µP supervisory circuits - engineered specifically for reliable power-on reset and brownout protection in space-constrained, battery-sensitive embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6346UR38 and how does it vary with temperature?
The MAX6346UR38 has a nominal reset threshold of 3.800V at +25°C, with ±1.5% tolerance at room temperature and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning threshold drift is limited to approximately ±19mV across the industrial temperature span - verified per Electrical Characteristics table in the official datasheet.
Does the MAX6346UR38 require any external components to function as a reset supervisor?
No, the MAX6346UR38 requires zero external components. It integrates a precision voltage reference, comparator, timer, and push-pull output driver in a single SOT23-3 package. Unlike RC-based reset circuits, the MAX6346UR38 delivers guaranteed 100ms minimum reset timeout and factory-trimmed 3.800V threshold without calibration or external passive parts.
What is the maximum sink current capability of the MAX6346UR38 RESET output?
The MAX6346UR38 RESET output can sink at least 1.6mA while maintaining VOL ≤ 0.3V (at VCC > 2.1V, reset asserted), and 100µA while maintaining VOL ≤ 0.4V (at VCC ≥ 1.2V). This push-pull drive strength allows direct interface with most µP RESET pins without external pull-up resistors or level-shifting circuitry.
Can the MAX6346UR38 operate reliably during power supply transients or voltage glitches?
Yes, the MAX6346UR38 is specifically designed to reject fast negative-going VCC transients. The datasheet's "Maximum Transient Duration vs. Reset Threshold Overdrive" graph confirms immunity to glitches <200µs wide at 100mV overdrive (VTH – VCC), preventing false resets in electrically noisy environments such as motor drives or switching power supplies.
Is the MAX6346UR38 pin-compatible with older Maxim supervisory ICs like the MAX809 series?
The MAX6346UR38 shares identical SOT23-3 pinout (VCC, RESET, GND) and push-pull active-low output behavior with MAX809TR38D3T, enabling drop-in replacement in many designs. However, differences in supply current (1.0µA vs. 2.5µA), VCC operating range (1.2V–5.5V vs. 1.0V–6.0V), and temperature rating (-40°C to +85°C vs. 0°C to +70°C) require validation for each target application.
MAX6346UR38 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:
- 3.8V
- 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:
- SOT-23-3
MAX6346UR38 FAQ
1.How can I place an order for MAX6346UR38 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR38 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 MAX6346UR38 reliable?
The price and inventory of MAX6346UR38 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR38 is usually 5 days.
3.What payment methods are accepted for MAX6346UR38?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR38 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR38?
MAX6346UR38 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR38 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 MAX6346UR38?
For technical support, including MAX6346UR38 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR38 requirements.
6.How does Aetrix verify that MAX6346UR38 is sourced from the original manufacturer or authorized distributors?
All MAX6346UR38 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 MAX6346UR38 meets industry standards.
7.What is the process for return or replacement of MAX6346UR38?
All MAX6346UR38 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR38, 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 MAX6346UR38 part is unused and in its original packaging.
Return procedure for MAX6346UR38:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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