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Analog Devices Inc./Maxim Integrated MAX6412UK26
- Part No.:
- MAX6412UK26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6412UK26.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:620
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Product details
Overview
MAX6412UK26 from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 2.625V VCC reset threshold, manual reset input (MR), and active-low push-pull reset output. It monitors supply voltage in systems from 1.6V to 5V, asserts reset during brownout or power-up, and guarantees valid reset down to VCC = 1V. Used in automotive ECUs and battery-powered controllers for reliable μP initialization.
For engineers reviewing the MAX6412UK26 datasheet, MAX6412UK26 pinout, MAX6412UK26 application, or MAX6412UK26 equivalent, key selection considerations include its SOT23-5 package, capacitor-adjustable reset timeout (275µs–5.75ms), 1.7µA typical quiescent current, -40°C to +125°C operation, and AEC-Q100 qualification for automotive use.
Technical Context
The MAX6412UK26 implements a precision bandgap-based voltage comparator for VCC monitoring with ±2.5% threshold accuracy over temperature and 4mV hysteresis. Its reset timeout is generated by a 240nA internal current source charging an external capacitor on the SRT pin, with deassertion triggered when the ramp reaches 0.65V.
It features a 20kΩ internal MR pullup resistor, supports manual reset via logic-low pulse ≥1µs, and provides glitch immunity with 75ns rejection on MR. The active-low push-pull RESET output sinks up to 3.2mA at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V nominal (±2.5% over -40°C to +125°C); ensures reset assertion before μP operational voltage collapse |
| Quiescent Current | 1.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable/automotive standby modes |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF); configurable for diverse μP reset timing requirements |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive and industrial embedded environments |
| RESET Output Type | Active-low push-pull; drives μP reset pin directly without external pullup, compatible with CMOS/TTL logic |
| MR Input Logic | Logic-low active with 20kΩ internal pullup; eliminates need for external components in manual reset implementation |
| VCC Validity Range | Guaranteed RESET validity down to VCC = 1V; prevents undefined reset state during deep brownout |
Pinout & Package
SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, gull-wing leads, RoHS-compliant lead-free option available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives μP reset pin low during fault; returns high after timeout; no external pullup required |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external capacitor (SRT-to-GND) |
| 3 - MR | Manual reset input | Pull low to assert reset; internal 20kΩ pullup allows NC if unused; 75ns glitch rejection |
| 4 - SRT | Set reset timeout input | Connect external capacitor to GND; 240nA current source sets tRP = 2.71×10⁶×CSRT + 275µs |
| 5 - VCC | Supply voltage and monitored rail | Power source and primary voltage monitor input; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise timing alignment with μP reset requirements across diverse platforms using one standard part |
| Factory-trimmed 2.625V threshold | Eliminates external resistor divider; reduces BOM count and layout area vs. adjustable supervisors |
| AEC-Q100 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power management |
| Low 1.7µA quiescent current | Minimizes battery drain in always-on vehicle modules and portable medical instruments |
| Power-supply transient immunity | Rejects <50µs negative VCC transients down to 100mV below threshold-prevents false resets in noisy environments |
Applications
| Automotive Engine Control Unit (ECU) | Battery-Powered Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3V main supply in diesel ECU during cold cranking where voltage sags to 2.4V. IC Role / Device Role / Timing Role: Asserts reset until VCC recovers above 2.625V and holds for 4.375ms (CSRT = 1500pF) to ensure μP completes boot sequence. Use Value: Prevents code execution errors during start-stop cycles; AEC-Q100 rating ensures reliability over 15-year vehicle lifetime. | Use Scenario: Supervises 1.8V LDO output powering ARM Cortex-M4 in handheld glucose meter. IC Role / Device Role / Timing Role: Detects brownout below 2.625V on main 3.3V rail feeding the LDO; triggers controlled shutdown before memory corruption. Use Value: 1.7µA ICC extends single-CR2032 battery life to >3 years in standby; SOT23-5 footprint saves PCB space. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Ensures deterministic restart of TI C2000 DSP after AC line interruption causes 5V rail dip. IC Role / Device Role / Timing Role: Uses MR pin for watchdog-triggered reset; 20kΩ internal pullup simplifies board design versus discrete resistor. Use Value: -40°C to +125°C rating supports operation inside sealed enclosures near motors; push-pull output drives DSP reset without level-shifting. | Use Scenario: Guards against firmware corruption during voltage dips caused by RF interference from AMR mesh networks. IC Role / Device Role / Timing Role: Monitors 5V auxiliary supply; 75ns MR glitch rejection prevents spurious resets from EMI-induced noise on reset button traces. Use Value: 4mV hysteresis avoids chatter near threshold; open-drain alternatives excluded since push-pull suits isolated meter MCU interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316LUK26D3+ | Same 2.625V threshold, but uses fixed 140ms timeout (no SRT capacitor); higher 5µA ICC | Lacks timeout adjustability; suited only for designs where fixed delay suffices | Select MAX6412UK26 when variable reset duration is needed for different μP families |
| TPS3808G33DBVR | 2.93V threshold (not 2.625V); fixed 200ms timeout; 1.1µA ICC; SOT23-6 package | Higher threshold may miss early brownout detection; extra pin increases layout complexity | Choose MAX6412UK26 for tighter 2.625V margin and SOT23-5 pin compatibility |
Compared with MAX6316LUK26D3+ and TPS3808G33DBVR, the MAX6412UK26 uniquely combines precise 2.625V detection, capacitor-programmable timeout, ultra-low 1.7µA current, and SOT23-5 footprint-making it optimal for space-constrained, battery-sensitive automotive and industrial supervisory roles.
Availability
MAX6412UK26 is available at Aetrix Electronics and suitable for automotive ECUs, portable medical devices, and industrial PLCs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6412UK26 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 demanding industrial, automotive, and computing applications.
The MAX6412UK26 belongs to the MAX6412–MAX6420 family of low-power μP supervisors engineered specifically for robust voltage monitoring and reset generation in harsh environments with strict power and space constraints.
FAQ
What is the exact reset threshold voltage for MAX6412UK26?
The MAX6412UK26 has a factory-trimmed VCC reset threshold of 2.625V nominal, with ±2.5% tolerance over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the datasheet (suffix "26" corresponds to 2.559V min / 2.625V typ / 2.691V max). The MAX6412UK26 uses laser-trimmed resistors to achieve this precision without external components.
Does MAX6412UK26 support dual-voltage monitoring?
No, the MAX6412UK26 does not support dual-voltage monitoring. It is a single-threshold supervisor with fixed VCC monitoring only. Dual-voltage capability is exclusive to the MAX6418/MAX6419/MAX6420 variants, which integrate both a factory-trimmed VCC threshold and an adjustable RESET IN input. The MAX6412UK26 lacks the RESET IN pin and associated comparator circuitry.
What capacitor value sets a 3.5ms reset timeout for MAX6412UK26?
To achieve a 3.5ms reset timeout with the MAX6412UK26, use CSRT = (3.5ms − 275µs) / 2.71×10⁶ = 1195pF. A standard 1200pF ceramic capacitor is recommended, yielding ~3.52ms per the formula tRP = (2.71×10⁶) × CSRT + 275µs. Ensure the capacitor has leakage <10nA; X7R or C0G dielectrics are suitable.
Is MAX6412UK26 qualified for automotive applications?
Yes, the MAX6412UK26 is AEC-Q100 qualified for automotive use. While the base part number does not include "/V", the datasheet explicitly states that MAX6412UKxx parts are offered in AEC-Q100 qualified versions (see Ordering Information section and footnote "*AEC-Q100 Qualified, Refer to Ordering Information for Specific /V Parts"). The -40°C to +125°C temperature rating and robust transient immunity further support automotive deployment.
Can MAX6412UK26 operate with VCC below 1.6V?
Yes, the MAX6412UK26 functions with VCC as low as 1.0V, though its specified monitoring range starts at 1.6V. The datasheet guarantees RESET validity down to VCC = 1V, and absolute maximum ratings allow VCC = 1.0V minimum. Below 1.6V, reset assertion remains functional, but threshold accuracy is not characterized-designers should verify behavior in their specific low-voltage application.
MAX6412UK26 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6412UK26 FAQ
1.How can I place an order for MAX6412UK26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6412UK26 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 MAX6412UK26 reliable?
The price and inventory of MAX6412UK26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6412UK26 is usually 5 days.
3.What payment methods are accepted for MAX6412UK26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6412UK26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6412UK26?
MAX6412UK26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6412UK26 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 MAX6412UK26?
For technical support, including MAX6412UK26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6412UK26 requirements.
6.How does Aetrix verify that MAX6412UK26 is sourced from the original manufacturer or authorized distributors?
All MAX6412UK26 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 MAX6412UK26 meets industry standards.
7.What is the process for return or replacement of MAX6412UK26?
All MAX6412UK26 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6412UK26, 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 MAX6412UK26 part is unused and in its original packaging.
Return procedure for MAX6412UK26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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