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Analog Devices Inc./Maxim Integrated MAX6346UR34+T
- Part No.:
- MAX6346UR34+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR34+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,622
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Product details
Overview
MAX6346UR34+T from Maxim Integrated is a push-pull, active-low microprocessor supervisory circuit in SOT23-3 package, monitoring 3.4V supply rails with ±2.5% reset threshold accuracy over -40°C to +85°C, 1µA max supply current, and 100ms minimum reset timeout-used for reliable power-on reset assertion in battery-powered microcontroller systems.
For engineers reviewing the MAX6346UR34+T datasheet, MAX6346UR34+T pinout, MAX6346UR34+T application, or MAX6346UR34+T equivalent, this page delivers verified electrical parameters, thermal behavior, transient immunity specs, and real-world design context for µP reset integration in portable and industrial embedded systems.
Technical Context
The MAX6346UR34+T implements a precision bandgap-based voltage comparator with factory-trimmed 3.400V reset threshold (±2.5% over temperature), hysteresis of 9.5mV, and internal timing capacitor to guarantee ≥100ms reset pulse width after VCC recovery. It asserts RESET low during brownout, power-up, and power-down events.
Its push-pull output drives high-impedance loads directly without external pull-up, sourcing up to 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V-enabling direct interface with µP reset inputs requiring active-low assertion and fast release timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.400V ±2.5% over -40°C to +85°C - ensures reliable detection of 3.3V rail undervoltage before µP malfunction. |
| Supply Current | 1.0µA max at +25°C - enables multi-year operation on coin-cell batteries in portable instrumentation. |
| Reset Timeout | 100ms to 280ms - guarantees sufficient hold time for µP initialization across all supply ramp rates. |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and supports direct µP reset pin drive. |
| VCC Range | 1.2V to 5.5V - supports operation down to partial power states while maintaining reset integrity. |
| Transient Immunity | Rejects VCC glitches <20µs at 100mV overdrive - prevents false resets during digital switching noise. |
| Reset Hysteresis | 9.5mV - avoids oscillation near threshold during slow VCC recovery or noise. |
Pinout & Package
MAX6346UR34+T is housed in a 3-pin SOT23-3 package (JEDEC TO-236AB), 1.3mm × 2.9mm footprint, 1.0mm height, RoHS-compliant lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane. |
| 2 | RESET | Active-low push-pull output; sinks 1.6mA when asserted, sources 500µA when released - directly drives µP reset input. |
| 3 | VCC | Power supply input; operates from 1.2V–5.5V; internally monitors this node for reset generation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1µA max enables >10-year battery life in always-on sensor nodes using CR2032 cells. |
| Precision reset threshold | 3.400V ±2.5% over full temperature range ensures deterministic reset timing across environmental extremes. |
| Factory-trimmed hysteresis | 9.5mV prevents chatter during marginal VCC recovery-critical for stable boot in noisy industrial environments. |
| No external components required | Integrated timing capacitor and comparator eliminate BOM cost and PCB area vs. discrete reset solutions. |
| Push-pull output architecture | Drives reset line actively high and low-avoids weak pull-up limitations and improves noise margin vs. open-drain alternatives. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG monitor powered by single Li-MnO₂ cell with 2.8–3.6V discharge profile. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and asserts active-low RESET until regulated rail stabilizes post-power-up. Use Value: 1µA supply current extends battery runtime beyond 36 months; 3.4V threshold aligns precisely with LDO dropout margin. |
Use Scenario: DIN-rail mounted analog input module exposed to 40–85°C ambient and conducted EMI. IC Role / Device Role / Timing Role: Monitors isolated 3.3V logic supply and holds µC in reset during AC line sags or transients. Use Value: ±2.5% threshold stability over temperature prevents spurious resets; 9.5mV hysteresis rejects switching noise from adjacent SMPS. |
| Smart Meter Communication Units | Automotive Body Control Modules |
|
Use Scenario: NB-IoT modem subsystem operating from 3.3V rail derived from automotive battery via buck converter. IC Role / Device Role / Timing Role: Provides guaranteed 100ms reset pulse after cold-crank recovery to ensure clean modem firmware boot. Use Value: 100–280ms timeout window accommodates worst-case VCC ramp rates during engine start; push-pull output ensures fast release. |
Use Scenario: Low-power door module with wake-on-RF capability, powered from vehicle battery through LDO. IC Role / Device Role / Timing Role: Detects brownout below 3.4V during load-dump transients and forces µC reset to prevent corrupted EEPROM writes. Use Value: 20µs glitch rejection blocks CAN/LIN bus noise; 1.2V operational minimum supports reset assertion even during deep undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR33+T | 3.08V reset threshold, 1.6µA max ICC, SC70-3 only - no SOT23-3 option; 140ms min timeout. | Designed for 3.3V systems with tighter tolerance (±1.5%) but higher current and fixed package. | Select when 3.08V threshold better matches LDO nominal output and SC70 footprint is acceptable. |
| TPS3808G33DBVR | 3.3V threshold, 2.5µA ICC, push-pull, SOT23-6 - extra enable pin and manual reset input not present on MAX6346UR34+T. | Supports system-level reset control via EN pin; larger package adds routing complexity in space-constrained designs. | Choose when manual reset override or enable gating is required; otherwise MAX6346UR34+T offers lower ICC and smaller footprint. |
Compared with MAX809TR33+T and TPS3808G33DBVR, MAX6346UR34+T delivers the lowest supply current (1µA), exact 3.4V threshold matching common 3.3V LDO dropout margins, and smallest SOT23-3 footprint-making it optimal for ultra-low-power, size-sensitive µP supervision where fixed threshold and minimal BOM are priorities.
Availability
MAX6346UR34+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.
Supply support for MAX6346UR34+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, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX6346 series belongs to Maxim's ultra-low-power µP supervisory product line, engineered specifically for battery-operated and thermally demanding embedded systems requiring deterministic reset behavior with minimal current draw.
FAQ
What is the exact reset threshold voltage of MAX6346UR34+T and how tightly is it specified?
The MAX6346UR34+T has a factory-trimmed nominal reset threshold of 3.400V, 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 applies directly to the MAX6346UR34+T device-not inferred from family data.
Does MAX6346UR34+T require an external pull-up resistor on its RESET pin?
No. The MAX6346UR34+T features a push-pull output stage that actively drives RESET high when released and low when asserted, eliminating the need for an external pull-up resistor. This reduces BOM count and improves noise immunity compared to open-drain alternatives like the MAX6348UR34+T.
What is the minimum VCC voltage at which MAX6346UR34+T remains functional and asserts reset correctly?
The MAX6346UR34+T is fully specified down to 1.2V VCC over temperature. It guarantees correct reset assertion state for VCC as low as 1.2V, enabling reliable operation during deep brownout conditions where other supervisors may fail to hold reset.
How does MAX6346UR34+T handle short voltage transients on the VCC line?
The MAX6346UR34+T ignores negative-going VCC transients shorter than 20µs when the overdrive (VTH – VCC) is 100mV, per Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive." This immunity prevents false resets caused by digital switching noise or EMI coupling onto the supply rail.
Is MAX6346UR34+T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes-MAX6346UR34+T shares identical SOT23-3 pinout (GND, RESET, VCC) and functional behavior with MAX809-series devices, including compatible voltage thresholds and timing. However, MAX6346UR34+T offers lower supply current (1µA vs. 1.6µA) and tighter thermal drift (±2.5% vs. ±2.0%), making it a performance upgrade within the same footprint.
MAX6346UR34+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:
- 3.4V
- 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
MAX6346UR34+T FAQ
1.How can I place an order for MAX6346UR34+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR34+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 MAX6346UR34+T reliable?
The price and inventory of MAX6346UR34+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR34+T is usually 5 days.
3.What payment methods are accepted for MAX6346UR34+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR34+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR34+T?
MAX6346UR34+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR34+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 MAX6346UR34+T?
For technical support, including MAX6346UR34+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR34+T requirements.
6.How does Aetrix verify that MAX6346UR34+T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR34+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 MAX6346UR34+T meets industry standards.
7.What is the process for return or replacement of MAX6346UR34+T?
All MAX6346UR34+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR34+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 MAX6346UR34+T part is unused and in its original packaging.
Return procedure for MAX6346UR34+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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