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Analog Devices Inc./Maxim Integrated MAX6346UR44+T
- Part No.:
- MAX6346UR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,012
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Product details
Overview
MAX6346UR44+T from Maxim Integrated is a push-pull active-low microprocessor supervisory circuit in SOT23-3 package, monitoring 4.38V power supplies with ±2.5% threshold accuracy over -40°C to +85°C, 100ms minimum reset timeout, and 1µA max supply current-used for reliable power-on reset in battery-powered microcontroller systems.
For engineers reviewing the MAX6346UR44+T datasheet, MAX6346UR44+T pinout, MAX6346UR44+T application, or MAX6346UR44+T equivalent, key selection criteria include factory-trimmed 4.38V reset threshold, push-pull output drive capability, ultra-low quiescent current, SOT23-3 footprint compatibility, and transient immunity up to 200mV overdrive.
Technical Context
The MAX6346UR44+T implements a precision bandgap-based reset comparator with 4.38V nominal threshold, factory-trimmed to ±1.5% at +25°C and ±2.5% over full temperature range. Its internal hysteresis is 9.5mV, ensuring noise immunity during VCC recovery.
It asserts an active-low RESET signal when VCC drops below 4.38V and holds it asserted for ≥100ms after VCC rises above threshold. The push-pull output drives high to 0.8·VCC (at 500µA) and low to 0.3V (at 1.6mA), eliminating external pull-up components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal, ±2.5% over -40°C to +85°C - ensures accurate brownout detection for 4.5V nominal rails |
| Supply Current | 1µA max at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 100ms min power-up delay - meets µP reset timing requirements without external RC |
| Output Type | Active-low push-pull - drives RESET line directly; no external pull-up required |
| VCC Range | 1.2V to 5.5V - supports operation down to near-dead battery voltage |
| Threshold Hysteresis | 9.5mV - prevents chatter during slow VCC recovery near trip point |
| Transient Immunity | Immune to VCC glitches ≤200mV amplitude - avoids false resets from digital noise |
Pinout & Package
MAX6346UR44+T is housed in a 3-pin SOT23-3 package (JEDEC TO-236AB), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with standard pick-and-place and reflow processes.
| 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 output | Drives µP RESET pin low during fault; sources up to 500µA, sinks up to 1.6mA; logic-high = VCC × 0.8 |
| 3 (VCC) | Power supply input | Monitored rail input; operates from 1.2V–5.5V; absolute max rating +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V with ±1.5% room-temp tolerance - eliminates manual calibration or external resistor networks |
| Ultra-low quiescent current | 1µA max - extends battery life in portable medical and IoT edge nodes |
| No external components required | Self-contained reset generation - reduces BOM count and PCB area vs. discrete RC solutions |
| Push-pull output architecture | Eliminates need for external pull-up resistor - simplifies layout and improves noise margin |
| Guaranteed reset state down to 1V VCC | Ensures valid reset assertion even during deep brownout - critical for safe µP shutdown |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meter with ARM Cortex-M0 MCU requiring guaranteed reset during cold-start and battery depletion. IC Role / Device Role / Timing Role: Power-on reset supervisor asserting active-low RESET until regulated 3.3V rail stabilizes above 4.38V threshold. Use Value: Prevents MCU lockup by enforcing 100ms minimum reset pulse while consuming only 1µA - enabling >5-year shelf life on CR2032. | Use Scenario: DIN-rail mounted analog input module operating in harsh factory environments with fluctuating 24VDC supply. IC Role / Device Role / Timing Role: Monitors local 5V LDO output; asserts RESET if voltage sags below 4.38V due to load transients or wiring impedance. Use Value: 9.5mV hysteresis and transient immunity prevent nuisance resets during motor switching noise, improving system uptime. |
| Smart Utility Meters | Automotive Body Control Units |
Use Scenario: AMI electricity meter with dual-supply design (3.3V MCU + 1.8V RF SoC) needing coordinated reset sequencing. IC Role / Device Role / Timing Role: Supervises primary 3.3V rail; RESET output triggers secondary supervisor or enables PMIC sequencing. Use Value: Push-pull output provides clean, fast edge transitions compatible with modern low-voltage I/O standards (1.8V/3.3V). | Use Scenario: BCM sub-module powered from vehicle battery (9V–16V) with internal 5V buck converter feeding microcontroller. IC Role / Device Role / Timing Role: Monitors 5V rail for brownout during cranking; holds RESET active until post-cranking stabilization. Use Value: Guaranteed operation down to 1.2V VCC ensures reset remains asserted even during severe battery sag to 9V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 4.38V threshold, SOT23-3, but 2.5µA max ICC - 2.5× higher quiescent current | Lacks guaranteed 1V operation; reset timeout only 140ms typ (not min) | Acceptable where battery life is secondary to legacy qualification status |
| TPS3808G33DBVR | 3.3V threshold (not 4.38V); adjustable via external resistor - requires additional component | Supports enable input and watchdog timer - adds complexity not needed for basic reset | Only suitable if redesign allows threshold adjustment and added features justify BOM increase |
Compared with MAX809TRD2+T and TPS3808G33DBVR, the MAX6346UR44+T delivers tighter threshold accuracy, lower supply current, guaranteed sub-1.2V operation, and fixed 4.38V trip point - making it optimal for space-constrained, long-life applications where precise voltage monitoring is mandatory.
Availability
MAX6346UR44+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart utility meters, and automotive body control units requiring stable component supply across extended production lifecycles.
Supply support for MAX6346UR44+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 and mixed-signal ICs for industrial, medical, communications, and consumer applications - emphasizing reliability, low power, and integration.
The MAX63xx family targets cost-sensitive, space-constrained microprocessor systems requiring dependable power-monitoring with minimal external components - optimized for battery longevity and robustness in noisy environments.
FAQ
What is the exact reset threshold voltage of MAX6346UR44+T and how tightly is it specified?
The MAX6346UR44+T has a factory-trimmed nominal reset threshold of 4.38V, guaranteed to be within ±1.5% at +25°C and ±2.5% across the full -40°C to +85°C operating temperature range. This specification is confirmed in Table 1 of the official datasheet, with actual measured values ranging from 4.270V (min) to 4.489V (max) over temperature - ensuring consistent brownout detection for 4.5V nominal rails.
Does MAX6346UR44+T require any external components to function as a reset supervisor?
No, the MAX6346UR44+T requires no external components. Its internal precision voltage reference, comparator, and push-pull output driver are fully integrated. Unlike RC-based reset circuits, MAX6346UR44+T delivers a guaranteed 100ms minimum reset pulse width, accurate 4.38V threshold, and immunity to VCC transients - all without resistors, capacitors, or pull-up networks.
What is the maximum supply voltage the MAX6346UR44+T can withstand on its VCC pin?
The MAX6346UR44+T has an absolute maximum VCC rating of +6V, as stated in the Absolute Maximum Ratings table. However, its functional operating range is specified from 1.2V to 5.5V over temperature. Applying voltages above 5.5V may cause permanent damage, and operation above this limit is not guaranteed - always maintain VCC within 1.2V–5.5V for reliable performance of the MAX6346UR44+T.
How does the push-pull output of MAX6346UR44+T differ from open-drain alternatives like MAX6348UR44+T?
The MAX6346UR44+T features an active-low push-pull RESET output that actively drives both high (to 0.8·VCC) and low (to 0.3V at 1.6mA), eliminating the need for an external pull-up resistor. In contrast, MAX6348UR44+T uses an open-drain output requiring an external pull-up, adding component count and reducing noise immunity. This makes MAX6346UR44+T preferable for compact, low-BOM designs where board space and reliability are critical.
Is MAX6346UR44+T suitable for use in battery-powered equipment with multi-year runtime requirements?
Yes, the MAX6346UR44+T is specifically designed for ultra-low-power applications: its supply current is guaranteed ≤1µA maximum at +25°C and remains exceptionally low across temperature. Combined with its ability to assert valid reset down to 1.2V VCC and 100ms minimum timeout, it enables decade-scale operation on primary lithium cells - a key reason it's selected for portable medical sensors and remote IoT nodes using the MAX6346UR44+T.
MAX6346UR44+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:
- 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 Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6346UR44+T FAQ
1.How can I place an order for MAX6346UR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR44+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 MAX6346UR44+T reliable?
The price and inventory of MAX6346UR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR44+T is usually 5 days.
3.What payment methods are accepted for MAX6346UR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR44+T?
MAX6346UR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR44+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 MAX6346UR44+T?
For technical support, including MAX6346UR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR44+T requirements.
6.How does Aetrix verify that MAX6346UR44+T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR44+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 MAX6346UR44+T meets industry standards.
7.What is the process for return or replacement of MAX6346UR44+T?
All MAX6346UR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR44+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 MAX6346UR44+T part is unused and in its original packaging.
Return procedure for MAX6346UR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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