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Analog Devices Inc./Maxim Integrated MAX6346UR45-T
- Part No.:
- MAX6346UR45-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6346UR45-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
The MAX6346UR45-T from Maxim Integrated is a push-pull, active-low microprocessor supervisory circuit designed to monitor 4.5V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 4.500V reset threshold (±2.5% over –40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power supply monitoring.
For engineers reviewing the MAX6346UR45-T datasheet, MAX6346UR45-T pinout, MAX6346UR45-T application, or MAX6346UR45-T equivalent, this page delivers verified specifications, package details, real-world use cases, and validated alternative options for µP reset circuit design and BOM optimization.
Technical Context
The MAX6346UR45-T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC drops below its 4.500V threshold. Its internal timer guarantees a minimum 100ms reset assertion after VCC recovers, independent of supply ramp rate.
It uses a push-pull output stage capable of sourcing 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V - enabling direct interface with µP reset inputs without external pull-ups. The device ignores fast VCC transients (<20µs at 100mV overdrive) and remains functional down to 1.2V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V ±2.5% (–40°C to +85°C); ensures reliable detection of 4.5V rail collapse before µP malfunction. |
| Supply Current | 1.0µA max at +25°C; enables multi-year operation in coin-cell–powered devices. |
| Reset Timeout | 100ms min power-up delay; meets JEDEC JESD78 requirement for µP initialization stability. |
| Output Type | Active-low push-pull; eliminates need for external pull-up resistor on reset line. |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep brownout and full 5V system operation. |
| Reset Hysteresis | 9.5mV; prevents chatter during slow VCC recovery near threshold. |
| Transient Immunity | Rejects <20µs negative glitches at 100mV overdrive; suppresses noise-induced false resets. |
Pinout & Package
MAX6346UR45-T is housed in a 3-pin SOT23-3 package (package code U3-1), with 1.3mm × 2.9mm footprint and gull-wing leads. Thermal resistance θJA = 250°C/W; max continuous power dissipation = 320mW at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output driver; must be low-impedance connection to system ground plane. |
| 2 | RESET | Active-low push-pull output; drives low during fault and high during normal operation; directly interfaces µP RESET pin. |
| 3 | VCC | Supply input; powers internal circuitry and defines reset threshold reference; accepts 1.2V–5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year battery life in IoT sensors powered by CR2032 cells. |
| Precision 4.5V threshold | Factory-trimmed to ±2.5% over temperature eliminates calibration overhead in production test. |
| Push-pull RESET | Removes dependency on external pull-up resistors, reducing BOM count and PCB area in space-constrained designs. |
| 100ms guaranteed timeout | Ensures µP completes internal initialization before release, preventing firmware lockup on marginal power ramps. |
| VCC down to 1.2V operation | Permits supervision during deep brownout events where other supervisors cease functioning. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch monitors heart rhythm continuously using a CR2032 battery and low-power MCU. IC Role / Device Role / Timing Role: MAX6346UR45-T asserts reset if battery voltage sags below 4.5V, halting data acquisition until stable power resumes. Use Value: Prevents corrupted sensor readings and flash write errors during battery depletion, improving diagnostic reliability. |
Use Scenario: Remote analog input module in factory automation draws power from 24VDC supply via local LDO. IC Role / Device Role / Timing Role: MAX6346UR45-T supervises the 4.5V LDO output feeding the ADC and communication ICs. Use Value: Guarantees clean power-up sequencing and prevents spurious Modbus RTU frame transmission during brownout. |
| Smart Meter Data Loggers | Automotive Telematics ECUs |
|
Use Scenario: Utility meter stores hourly consumption data in EEPROM; powered by backup supercapacitor during AC outage. IC Role / Device Role / Timing Role: MAX6346UR45-T holds MCU in reset while supercap voltage decays below 4.5V, blocking unsafe writes. Use Value: Eliminates EEPROM corruption risk during capacitor discharge, preserving regulatory compliance data integrity. |
Use Scenario: Cellular-connected telematics unit experiences load-dump transients on vehicle 12V rail converted to 4.5V. IC Role / Device Role / Timing Role: MAX6346UR45-T rejects sub-20µs transients and asserts reset only on sustained undervoltage. Use Value: Avoids unnecessary ECU reboots during alternator switching noise, maintaining GNSS lock and cloud session continuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR45-T | Same 4.5V threshold, identical SOT23-3 package and push-pull output, but rated for 0°C to +70°C industrial range (vs. –40°C to +85°C). | Not qualified for extended temperature environments such as outdoor smart meters or under-hood automotive modules. | Select MAX6346UR45-T when operation below –40°C or above +70°C is required. |
| TPS3808G33DBVR | 3.3V fixed threshold, 350nA typical ICC, SOT23-6 package; requires external resistor for manual reset input. | Lacks factory-trimmed 4.5V option; different pinout and no direct drop-in replacement capability. | Choose only if 3.3V supervision suffices and ultra-low ICC (<1µA) is critical; redesign required. |
Compared with MAX6326UR45-T, the MAX6346UR45-T extends temperature qualification to –40°C to +85°C without changing layout or firmware. Against TPS3808G33DBVR, it offers exact 4.5V threshold matching and push-pull simplicity, avoiding pinout changes and external component additions.
Availability
MAX6346UR45-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart meter data loggers requiring stable component supply across automotive and extended-temperature industrial programs.
Supply support for MAX6346UR45-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, communications, and consumer applications.
The MAX63xx family was engineered specifically for ultra-low-power, high-accuracy microprocessor reset supervision in battery-critical and thermally demanding systems.
FAQ
What is the exact reset threshold voltage of the MAX6346UR45-T and how tightly is it specified?
The MAX6346UR45-T has a factory-trimmed nominal reset threshold of 4.500V, guaranteed to be within ±2.5% over the full operating temperature range of –40°C to +85°C. At +25°C, the tolerance tightens to ±1.5%, ensuring precise brownout detection for 4.5V rails without external calibration. This specification is confirmed in Table 1 of the official datasheet.
Does the MAX6346UR45-T require an external pull-up resistor on its RESET pin?
No, the MAX6346UR45-T features a push-pull output stage that actively drives both high and low states. It sources up to 500µA at 0.8·VCC when high and sinks up to 1.6mA at ≤0.3V when low - eliminating the need for any external pull-up resistor. This simplifies layout and reduces BOM cost compared to open-drain alternatives like the MAX6348UR45-T.
Can the MAX6346UR45-T operate reliably during a brownout where VCC falls below 2.0V?
Yes, the MAX6346UR45-T remains fully functional down to VCC = 1.2V across the full temperature range. Its internal comparator and timer continue asserting RESET correctly even as VCC collapses, and it guarantees proper state retention until VCC drops below 1.0V (absolute minimum). This behavior is explicitly guaranteed in the Absolute Maximum Ratings and Electrical Characteristics sections.
How does the MAX6346UR45-T handle short voltage transients on the VCC line?
The MAX6346UR45-T incorporates transient immunity circuitry that ignores negative-going VCC glitches shorter than ~20µs when the overdrive (VTH – VCC) is 100mV. As shown in Figure 4 of the datasheet, the maximum tolerable glitch duration decreases as overdrive increases - e.g., ~100µs at 10mV overdrive. This prevents false resets from switching noise or ESD coupling.
Is the MAX6346UR45-T pin-compatible with legacy Maxim reset supervisors like the MAX809?
Yes, the MAX6346UR45-T is explicitly stated in the datasheet to be pin compatible with the MAX803/MAX809/MAX810 series in SOT23-3 packages. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC - matching the same pinout and electrical behavior, enabling drop-in replacement without PCB modification.
MAX6346UR45-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:
- 4.5V
- 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
MAX6346UR45-T FAQ
1.How can I place an order for MAX6346UR45-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6346UR45-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 MAX6346UR45-T reliable?
The price and inventory of MAX6346UR45-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6346UR45-T is usually 5 days.
3.What payment methods are accepted for MAX6346UR45-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6346UR45-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6346UR45-T?
MAX6346UR45-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6346UR45-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 MAX6346UR45-T?
For technical support, including MAX6346UR45-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6346UR45-T requirements.
6.How does Aetrix verify that MAX6346UR45-T is sourced from the original manufacturer or authorized distributors?
All MAX6346UR45-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 MAX6346UR45-T meets industry standards.
7.What is the process for return or replacement of MAX6346UR45-T?
All MAX6346UR45-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6346UR45-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 MAX6346UR45-T part is unused and in its original packaging.
Return procedure for MAX6346UR45-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6346UR45-T Tags
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