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Analog Devices Inc./Maxim Integrated MAX6346UR33+
- Part No.:
- MAX6346UR33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR33+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:786
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Product details
Overview
MAX6346UR33+ from Maxim Integrated is a precision 3.3V microprocessor supervisory circuit in SOT23-3 package, featuring active-low push-pull reset output, 1µA max supply current, ±2.5% reset threshold accuracy over -40°C to +85°C, and guaranteed operation down to 1V VCC. It monitors 3.3V power rails in embedded controllers and portable systems, asserting reset for ≥100ms after VCC recovers above 3.30V.
For engineers reviewing the MAX6346UR33+ datasheet, MAX6346UR33+ pinout, MAX6346UR33+ application, or MAX6346UR33+ equivalent, this page delivers verified technical context, pin-level design meaning, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the exact part number.
Technical Context
The MAX6346UR33+ implements a factory-trimmed bandgap-based reset comparator with 9.5mV hysteresis and transient immunity up to 200µs at 100mV overdrive. Its reset timeout is temperature-stable (100–280ms), and it maintains valid logic states across full VCC range (1.2V–5.5V).
As a member of the MAX634x series, it shares identical SC70/SOT23-3 footprint and pinout with MAX632x variants but uses higher-precision trim for 3.3V nominal threshold (3.25V–3.35V typ). All versions guarantee correct reset assertion down to 1V VCC and tolerate fast VCC transients without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.30V ±2.5% (±82.5mV) over -40°C to +85°C - ensures reliable brownout detection on 3.3V rails |
| Supply Current | 1.0µA max at 3.3V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms min after VCC rise - meets µP power-on reset timing requirements |
| Output Type | Active-low push-pull - drives reset line directly without external pull-up |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and wide input variation |
| Reset Hysteresis | 9.5mV - prevents chatter near threshold during slow VCC recovery |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
Pinout & Package
SOT23-3 package: 2.92mm × 1.3mm × 1.02mm body, gull-wing leads, RoHS-compliant lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-low push-pull reset output | Drives low during reset (VOL ≤ 0.3V @ 1.6mA); actively pulls high when deasserted (VOH ≥ 0.8·VCC) |
| 3 (VCC) | Supply input | Monitored voltage rail; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year coin-cell operation in always-on monitoring applications |
| Precision 3.3V threshold | Factory-trimmed to 3.30V ±2.5% eliminates need for external calibration or trimming resistors |
| Push-pull RESET | Eliminates external pull-up resistor, reducing BOM count and board space vs. open-drain alternatives |
| Brownout immunity | Valid reset assertion down to 1.2V VCC ensures deterministic behavior during deep undervoltage events |
| Transient rejection | Immune to VCC glitches ≤200µs at 100mV overdrive - prevents spurious resets in noisy power environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers with 3.3V FPGA and MCU cores. IC Role / Device Role / Timing Role: Primary power-on and brownout reset supervisor ensuring deterministic boot state after AC loss or voltage sag. Use Value: 100ms minimum reset pulse guarantees full initialization of ARM Cortex-M7 core and peripheral clocks before firmware execution. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring multi-year operation on CR2032 cells. IC Role / Device Role / Timing Role: Low-power supply monitor that asserts reset during battery depletion below 3.3V nominal. Use Value: 1µA max ICC extends usable battery life by >35% versus typical 5µA supervisors, while maintaining precise 3.3V trip point. |
| Network Edge Routers | Smart Energy Meters |
|
Use Scenario: Reset management for dual-core MIPS processors and Gigabit Ethernet PHYs in fanless edge gateways. IC Role / Device Role / Timing Role: Single-point VCC supervision for 3.3V I/O and memory rails, interfacing directly to processor reset pin. Use Value: Push-pull output drives reset line without pull-up, reducing layout complexity and eliminating risk of weak pull-up failure under ESD stress. |
Use Scenario: Tamper-resistant metering ICs operating from split-phase AC-derived 3.3V rails with frequent voltage sags. IC Role / Device Role / Timing Role: Brownout detector that holds microcontroller in reset until stable 3.3V is restored after line interruption. Use Value: ±2.5% threshold tolerance over full temperature range ensures consistent trip point across -25°C to +70°C field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR33+ | Same 3.3V threshold, identical SOT23-3 package and pinout, but rated only to +70°C (vs. +85°C for MAX6346UR33+) | Limited to commercial-temperature industrial designs; not qualified for extended-temperature automotive or outdoor metering | Select MAX6326UR33+ only if ambient operating temperature stays ≤+70°C and cost sensitivity outweighs thermal margin needs |
| TPS3123QDBVRQ1 | Automotive-grade AEC-Q100 qualified, 3.3V threshold, but 2.5µA max ICC and SC70-3 only (no SOT23-3 option) | Required for automotive infotainment or ADAS modules; incompatible footprint requires PCB redesign | Choose TPS3123QDBVRQ1 only when AEC-Q100 compliance is mandatory and SC70-3 layout is acceptable |
Compared with MAX6326UR33+, the MAX6346UR33+ adds guaranteed operation to +85°C and tighter production binning for industrial reliability; versus TPS3123QDBVRQ1, it offers lower power and direct SOT23-3 drop-in capability but lacks automotive qualification.
Availability
MAX6346UR33+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, network edge routers, smart energy meters, and battery-backed data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6346UR33+ 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 emphasis on low-power, high-reliability solutions.
The MAX6346UR33+ belongs to Maxim's ultra-low-power µP supervisory family, engineered specifically for robust reset generation in battery-critical and thermally demanding embedded systems where precision threshold stability and minimal quiescent current are essential.
FAQ
What is the exact reset threshold voltage of the MAX6346UR33+ and how tightly is it specified?
The MAX6346UR33+ has a nominal reset threshold of 3.30V, with a guaranteed tolerance of ±2.5% (±82.5mV) over the full operating temperature range of -40°C to +85°C. At +25°C, the threshold is 3.25V to 3.35V (typical), and the device uses factory laser trimming to achieve this precision without external components. This specification is explicitly confirmed in Table 1 of the official datasheet for the "R33" suffix variant.
Does the MAX6346UR33+ require an external pull-up resistor on its RESET pin?
No, the MAX6346UR33+ does not require an external pull-up resistor because it features an active-low push-pull RESET output. The internal output stage actively drives the pin high (VOH ≥ 0.8·VCC) when reset is deasserted and low (VOL ≤ 0.3V @ 1.6mA) when asserted. This eliminates the need for external passive components and reduces susceptibility to noise-induced false resets compared to open-drain alternatives.
What is the minimum VCC voltage at which the MAX6346UR33+ remains functional and asserts valid reset?
The MAX6346UR33+ is guaranteed to assert a valid reset signal and maintain correct logic states for VCC down to 1.2V over the full temperature range (-40°C to +85°C), and down to 1.0V at 0°C to +70°C. This ensures deterministic behavior during deep brownout conditions, allowing safe microprocessor hold states even as input voltage collapses - a key requirement confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
How does the MAX6346UR33+ handle fast voltage transients on the VCC line?
The MAX6346UR33+ incorporates built-in transient immunity: its reset comparator ignores negative-going VCC glitches shorter than 200µs when the overdrive (VTH – VCC) is 100mV, as shown in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph. This design prevents spurious resets caused by switching noise or coupling spikes, and is a documented feature of the MAX634x family architecture per the Applications Information section.
Is the MAX6346UR33+ pin-compatible with legacy Maxim reset ICs like the MAX809?
Yes, the MAX6346UR33+ is pin-compatible with the MAX809, MAX803, and MAX810 in SOT23-3 package - all share identical 3-pin configuration (VCC, RESET, GND) and push-pull active-low output behavior. This allows direct replacement in existing designs without PCB modification, provided the 3.3V threshold and extended temperature range meet system requirements. Compatibility is explicitly stated in the datasheet's Selector Guide and Pin Configuration section.
MAX6346UR33+ 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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- 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
MAX6346UR33+ FAQ
1.How can I place an order for MAX6346UR33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR33+ 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 MAX6346UR33+ reliable?
The price and inventory of MAX6346UR33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR33+ is usually 5 days.
3.What payment methods are accepted for MAX6346UR33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR33+?
MAX6346UR33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR33+ 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 MAX6346UR33+?
For technical support, including MAX6346UR33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR33+ requirements.
6.How does Aetrix verify that MAX6346UR33+ is sourced from the original manufacturer or authorized distributors?
All MAX6346UR33+ 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 MAX6346UR33+ meets industry standards.
7.What is the process for return or replacement of MAX6346UR33+?
All MAX6346UR33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR33+, 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 MAX6346UR33+ part is unused and in its original packaging.
Return procedure for MAX6346UR33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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