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Analog Devices Inc./Maxim Integrated MAX6306UK25D3
- Part No.:
- MAX6306UK25D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6306UK25D3.pdf
- Description:
- IC SUPERVISOR PROGRAMMABLE RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
The MAX6306UK25D3 from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC for undervoltage conditions and asserts an active-low push/pull RESET signal when the supply falls below its factory-set 2.5V threshold. It features a 140ms minimum reset timeout, manual-reset input (MR), and guaranteed RESET validity down to VCC = 1V. Used in multivoltage embedded systems to prevent microprocessor code execution errors during power-up or brownout.
For engineers reviewing the MAX6306UK25D3 datasheet, MAX6306UK25D3 pinout, MAX6306UK25D3 application, or MAX6306UK25D3 equivalent, key selection considerations include its 2.5V ±2.5% reset threshold tolerance over -40°C to +85°C, 8µA supply current, immunity to fast VCC transients, MR input with internal 63.5kΩ pull-up, and compatibility with 3.3V/5V system rails.
Technical Context
The MAX6306UK25D3 uses an internal factory-trimmed resistor divider to monitor VCC against a precision 2.5V threshold, with ±2.5% accuracy across -40°C to +85°C and 40ppm/°C temperature coefficient. Its reset timeout is fixed at 140ms (min), determined by factory programming encoded in the "D3" suffix.
This device integrates a manual-reset input (MR) with TTL/CMOS-compatible logic thresholds, internal ESD protection, and glitch rejection of 0.1µs. The push/pull RESET output sinks ≥1.2mA at VCC > 2.5V and sources ≥500µA, ensuring robust drive into µP reset pins without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.5V ±2.5% (–40°C to +85°C); ensures reliable brownout detection on 3.3V rails with margin |
| Reset Timeout Period | 140ms (min); guarantees sufficient hold time for microprocessor initialization sequences |
| Supply Current | 8µA (typ) at +25°C; enables battery-powered operation with minimal quiescent drain |
| RESET Output Type | Active-low push/pull; eliminates need for external pull-up resistor and supports bidirectional µP reset I/O |
| MR Input Pull-up | 63.5kΩ (typ); allows direct connection of momentary switch to GND without external components |
| Operating Temperature | –40°C to +85°C; qualified for industrial and automotive-adjacent embedded control environments |
| VCC Range | 2.5625V to +5.5V (VTH + 2.5% min to max rating); defines valid monitoring window for 2.5V threshold variant |
Pinout & Package
MAX6306UK25D3 is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm height - suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push/pull reset output | Drives µP reset pin directly; sinks ≥1.2mA at VCC > 2.5V, sources ≥500µA - no external pull-up required |
| 2: GND | System ground reference | Return path for all internal comparators and output stage; must be low-impedance for noise immunity |
| 3: RST IN | Adjustable undervoltage reset input | Monitors secondary supply via external resistor divider; asserts reset if voltage falls below 1.23V reference |
| 4: MR | Manual-reset input | Logic-low active; internal 63.5kΩ pull-up enables switch-to-GND interface; 1.5µs min pulse width |
| 5: VCC | Main supply input and monitored rail | Power source and primary voltage monitor; device operates only when VCC ≥ 2.5625V (2.5V + 2.5%) |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 2.5V threshold | Eliminates external resistor network and calibration effort for 3.3V system VCC supervision |
| 140ms reset timeout (D3) | Matches typical µP boot-time requirements without requiring external RC timing components |
| Push/pull RESET output | Provides full rail-to-rail drive strength for direct interfacing with bidirectional or high-capacitance reset inputs |
| MR input with internal pull-up | Reduces BOM count by enabling momentary switch connection without discrete pull-up resistor |
| Immunity to VCC transients ≤140µs | Prevents false resets from switching noise or coupling spikes on shared power rails |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3V logic rail and 5V analog supply in a battery-backed programmable logic controller operating in factory-floor environments with electrical noise. IC Role / Device Role / Timing Role: Primary VCC supervisor with secondary RST IN monitoring for dual-rail fault detection; provides 140ms reset assertion to ensure deterministic firmware startup after brownout. Use Value: Prevents corrupted state machine transitions during unstable power recovery, improving system reliability without adding discrete supervision circuitry. |
Use Scenario: Supervises main 3.3V MCU supply and backup coin-cell rail in a handheld ECG monitor with low-power sleep modes. IC Role / Device Role / Timing Role: Undervoltage detector with manual-reset capability for user-initiated recalibration; operates at 8µA to extend battery life between charges. Use Value: Enables safe, repeatable reset initiation during field service while maintaining ultra-low quiescent current during standby. |
| Automotive Infotainment Head Unit | Network Edge Gateway |
Use Scenario: Validates 5V USB-derived power and 3.3V SoC core rail in a thermally stressed infotainment module exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-supply monitor with –40°C to +85°C qualification; uses factory-trimmed 2.5V threshold to track 3.3V rail with ±2.5% accuracy across temperature. Use Value: Guarantees consistent reset behavior despite thermal drift, eliminating need for recalibration or trimming resistors. |
Use Scenario: Ensures clean boot sequence for ARM-based gateway managing Zigbee, BLE, and Ethernet interfaces in smart building infrastructure. IC Role / Device Role / Timing Role: Primary reset generator with MR input tied to watchdog timer output; asserts reset if any monitored rail drops or watchdog fails to refresh. Use Value: Provides hardware-enforced fail-safe recovery independent of software execution, critical for unattended remote deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT29D3-T | 2.93V reset threshold (±2.5%), same SOT23-5 package and D3 timeout; higher threshold targets 3.3V rail with tighter margin | Optimized for 3.3V systems where 2.5V threshold lacks sufficient hysteresis against ripple | Select when supervising nominal 3.3V supplies with >100mV ripple; retains identical pinout and MR functionality |
| TPS3808G125DBVR | 2.5V threshold (±0.5% typ), 200ms timeout, open-drain output; requires external pull-up; lower quiescent current (1.1µA) | Better accuracy and lower ICC suit ultra-low-power IoT nodes, but open-drain output adds component count | Choose for battery-critical applications where 1.1µA ICC outweighs added BOM complexity and reduced drive strength |
Compared with MAX6326UT29D3-T and TPS3808G125DBVR, the MAX6306UK25D3 offers balanced trade-offs: push/pull output reduces layout overhead, 2.5V threshold suits legacy 3.3V designs with known dropout margins, and 8µA ICC remains compatible with most portable systems without demanding nanowatt optimization.
Availability
MAX6306UK25D3 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive infotainment head units, and network edge gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6306UK25D3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX6305–MAX6313 family was designed to provide compact, low-power, multi-rail voltage supervision for embedded microprocessor systems - emphasizing factory-programmable thresholds, transient immunity, and minimal external component count.
FAQ
What is the exact reset threshold voltage for MAX6306UK25D3 and how does it vary with temperature?
The MAX6306UK25D3 has a factory-programmed nominal reset threshold of 2.5V, with ±2.5% tolerance over the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning the threshold drifts by approximately ±0.1% over a 50°C span. This ensures stable brownout detection on 3.3V rails even under thermal stress, and the specification is guaranteed - not typical - across temperature.
Does MAX6306UK25D3 require external components to function as a basic VCC supervisor?
No, the MAX6306UK25D3 requires zero external components for core VCC supervision. Its 2.5V threshold is factory-trimmed, the 140ms reset timeout is internally programmed (D3), and the MR input includes a 63.5kΩ internal pull-up. Only a 0.1µF VCC bypass capacitor is recommended for noise immunity - no resistors, capacitors, or pull-ups are needed for basic operation.
Can MAX6306UK25D3 monitor a second voltage rail, and if so, how is it configured?
Yes, the MAX6306UK25D3 includes a dedicated RST IN pin that functions as an adjustable undervoltage input. To monitor a second rail (e.g., 5V or 12V), connect a resistor divider between that rail and RST IN such that the voltage at RST IN falls below 1.23V when the monitored rail drops below the desired threshold. The internal comparator references 1.23V ±0.03V, and input leakage is ≤±25nA - enabling megohm-level divider resistors.
What is the maximum VCC voltage the MAX6306UK25D3 can safely monitor?
The MAX6306UK25D3 is rated for VCC operation from (VTH + 2.5%) to +5.5V, meaning its minimum valid VCC is 2.5625V (2.5V × 1.025). Its absolute maximum VCC is +6V, but continuous operation above +5.5V risks permanent damage. For reliable supervision of a 3.3V rail, VCC must remain within 2.5625V to 5.5V - well within standard logic supply tolerances.
How does the manual-reset (MR) input behave during power-up and brownout conditions?
The MR input on the MAX6306UK25D3 is active-low and features an internal 63.5kΩ pull-up. When pulled low, it forces RESET assertion immediately and holds it active for the full 140ms timeout after MR returns high. During brownout, if VCC drops below 2.5625V, the device enters undervoltage lockout and MR becomes ineffective - RESET remains asserted until VCC recovers and the timeout expires. MR cannot override the VCC monitor's fundamental enable condition.
MAX6306UK25D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.5V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6306UK25D3 FAQ
1.How can I place an order for MAX6306UK25D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6306UK25D3 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 MAX6306UK25D3 reliable?
The price and inventory of MAX6306UK25D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6306UK25D3 is usually 5 days.
3.What payment methods are accepted for MAX6306UK25D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6306UK25D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6306UK25D3?
MAX6306UK25D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6306UK25D3 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 MAX6306UK25D3?
For technical support, including MAX6306UK25D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6306UK25D3 requirements.
6.How does Aetrix verify that MAX6306UK25D3 is sourced from the original manufacturer or authorized distributors?
All MAX6306UK25D3 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 MAX6306UK25D3 meets industry standards.
7.What is the process for return or replacement of MAX6306UK25D3?
All MAX6306UK25D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6306UK25D3, 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 MAX6306UK25D3 part is unused and in its original packaging.
Return procedure for MAX6306UK25D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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