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Analog Devices Inc./Maxim Integrated MAX6346UR46-T
- Part No.:
- MAX6346UR46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,509
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Product details
Overview
MAX6346UR46-T from Maxim Integrated is a push-pull active-low microprocessor supervisory circuit that monitors 4.63V power supplies, asserts reset for ≥100ms after VCC rises above threshold, operates down to 1.2V VCC, and draws ≤1µA supply current-ideal for battery-powered embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6346UR46-T datasheet, MAX6346UR46-T pinout, MAX6346UR46-T application, or MAX6346UR46-T equivalent, this device delivers precision reset supervision with factory-trimmed 4.63V threshold, transient-immune operation, and SOT23-3 compatibility for space-constrained µP systems.
Technical Context
The MAX6346UR46-T implements a precision voltage comparator with 4.63V nominal reset threshold (±2.5% over –40°C to +85°C), 40ppm/°C tempco, and 6.3mV hysteresis to prevent chatter during threshold crossing. Its internal reset timer guarantees ≥100ms minimum assertion time after VCC recovery.
It features push-pull RESET output capable of sourcing 500µA at 0.8·VCC (VCC ≥ 2.1V) and sinking 1.6mA at ≤0.3V, with immunity to fast VCC transients up to 100V/µs slew rate and full specification across industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (nominal), ±2.5% over –40°C to +85°C - ensures accurate brownout detection for 5V systems |
| Supply Current | ≤1.0µA (max) at VCC = 3.2V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms (min) power-up delay - meets µP reset timing requirements without external RC |
| Output Type | Active-low push-pull - drives reset lines directly without pull-up resistor |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and full supply range |
| Reset Hysteresis | 6.3mV - prevents oscillation near threshold under noisy supply conditions |
| Transient Immunity | Rated for 100V/µs VCC slew rate - rejects short-duration supply glitches |
Pinout & Package
MAX6346UR46-T is housed in a 3-pin SOT23-3 package (package code U3-1), with 1.3mm × 2.9mm footprint and gull-wing leads compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output stage |
| 2 | RESET | Active-low push-pull output; sinks 1.6mA / sources 500µA; asserts low during VCC < 4.63V and for ≥100ms after recovery |
| 3 | VCC | Power supply input; monitored by internal comparator; supports 1.2V–5.5V operation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed threshold | 4.63V with ±2.5% tolerance over temperature - eliminates manual calibration or external resistors |
| Ultra-low quiescent current | ≤1µA max - reduces standby power in always-on monitoring applications |
| Push-pull RESET output | No external pull-up required - simplifies PCB layout and improves noise margin |
| Power-supply transient immunity | Immune to VCC glitches ≤100µs at 200mV overdrive - avoids false resets in noisy environments |
| Guaranteed reset state down to 1.2V | Ensures valid reset assertion even during severe brownout - critical for safe µP shutdown |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Monitoring 5V logic rails in programmable logic controllers exposed to variable line voltage and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU during brownout events. Use Value: Prevents corrupted firmware execution by guaranteeing ≥100ms reset hold time after VCC recovers to 4.63V. | Use Scenario: Battery-powered ECG monitor operating on single-cell Li-ion (3.0–4.2V) with backup LDO. IC Role / Device Role / Timing Role: Reset supervisor detecting drop below 4.63V threshold to initiate graceful shutdown before data loss. Use Value: ≤1µA supply current extends battery runtime while maintaining precise 4.63V trip point for system-level voltage margining. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: 5V supply supervision in non-safety-critical BCM subsystems (e.g., window lift control). IC Role / Device Role / Timing Role: Brownout detector interfacing directly with Infineon AURIX TC3xx reset input via push-pull drive. Use Value: Push-pull output eliminates need for external pull-up, reducing BOM count and improving EMC robustness. | Use Scenario: Monitoring auxiliary 5V rail powering metrology ADC and real-time clock in DIN-rail meters. IC Role / Device Role / Timing Role: Precision reset generator ensuring µC restarts only after stable 4.63V supply is confirmed. Use Value: 40ppm/°C tempco maintains threshold accuracy across –25°C to +70°C field operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR46-T | Same 4.63V threshold, identical SOT23-3 package and pinout, but rated for 0°C to +70°C industrial range | Limited to commercial-temperature applications; not qualified for full –40°C to +85°C operation | Select MAX6346UR46-T when extended temperature support is required for outdoor or automotive-adjacent use cases |
| TPS3808G33DBVR | 3.3V fixed threshold, 350nA typical IQ, SOT23-5 package with manual reset input and watchdog timer | Includes additional features (watchdog, manual reset) but different threshold and pin count - not pin-compatible | Choose TPS3808G33DBVR only if system requires watchdog functionality or lower IQ; MAX6346UR46-T remains optimal for pure 4.63V reset needs |
Compared with MAX6326UR46-T, the MAX6346UR46-T provides guaranteed –40°C to +85°C operation and tighter reset threshold stability over temperature; versus TPS3808G33DBVR, it offers exact 4.63V trip point and simpler 3-pin interface without extra features that increase cost and complexity.
Availability
MAX6346UR46-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart energy meters, and battery-powered instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for MAX6346UR46-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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, computing, and communications markets.
The MAX6346 series belongs to Maxim's ultra-low-power µP supervisory product line, engineered specifically for reliable reset generation in battery-powered and thermally demanding embedded systems where precision voltage monitoring and minimal quiescent current are critical.
FAQ
What is the exact reset threshold voltage of MAX6346UR46-T and how tightly is it specified?
The MAX6346UR46-T has a nominal reset threshold of 4.63V, factory-trimmed with ±1.5% tolerance at +25°C and ±2.5% over the full –40°C to +85°C operating range. This specification is guaranteed per datasheet Electrical Characteristics table and ensures consistent brownout detection for 5V systems without external calibration.
Does MAX6346UR46-T require an external pull-up resistor on its RESET pin?
No, MAX6346UR46-T does not require an external pull-up resistor because it features a push-pull active-low RESET output. The device can both source and sink current - delivering 0.8·VCC high-level voltage when deasserted and ≤0.3V low-level voltage when asserted - enabling direct connection to µP reset inputs without additional components.
What is the minimum VCC voltage at which MAX6346UR46-T guarantees correct reset behavior?
The MAX6346UR46-T guarantees correct reset state (i.e., RESET asserted low when VCC < 4.63V, and deasserted high when VCC > 4.63V) down to VCC = 1.2V over the full –40°C to +85°C temperature range. This ensures reliable operation during deep brownout conditions where other supervisors may fail.
How long does the RESET signal remain asserted after VCC rises above the 4.63V threshold in MAX6346UR46-T?
In MAX6346UR46-T, the RESET signal remains asserted (low) for a minimum of 100ms after VCC rises above the 4.63V reset threshold. The typical timeout is 185ms, with a maximum of 280ms, providing sufficient hold time to meet ARM, x86, and RISC-V processor reset timing requirements without external timing components.
Is MAX6346UR46-T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, MAX6346UR46-T is pin-compatible with MAX809 and other members of the MAX803/MAX809/MAX810 family in SOT23-3 package. It shares identical pinout (VCC, RESET, GND), same 3-pin footprint, and active-low push-pull output - enabling drop-in replacement where 4.63V threshold and extended temperature range are needed.
MAX6346UR46-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:
- 4.6V
- 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
MAX6346UR46-T FAQ
1.How can I place an order for MAX6346UR46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR46-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 MAX6346UR46-T reliable?
The price and inventory of MAX6346UR46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR46-T is usually 5 days.
3.What payment methods are accepted for MAX6346UR46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR46-T?
MAX6346UR46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR46-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 MAX6346UR46-T?
For technical support, including MAX6346UR46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR46-T requirements.
6.How does Aetrix verify that MAX6346UR46-T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR46-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 MAX6346UR46-T meets industry standards.
7.What is the process for return or replacement of MAX6346UR46-T?
All MAX6346UR46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR46-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 MAX6346UR46-T part is unused and in its original packaging.
Return procedure for MAX6346UR46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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