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Analog Devices Inc./Maxim Integrated MAX6412UK46-T
- Part No.:
- MAX6412UK46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6412UK46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:44,086
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Product details
Overview
MAX6412UK46-T from Maxim Integrated is a low-power microprocessor supervisor IC with fixed 4.625V VCC reset threshold, active-low push-pull reset output, manual reset input (MR), and capacitor-adjustable reset timeout. It monitors VCC in systems requiring precise brownout detection at 4.625V ±2.5% over -40°C to +125°C, and asserts reset for ≥3.0ms after VCC recovers or MR release. Used in automotive ECUs and battery-powered controllers where stable power-up sequencing is critical.
For engineers reviewing the MAX6412UK46-T datasheet, MAX6412UK46-T pinout, MAX6412UK46-T application, or MAX6412UK46-T equivalent, this page delivers verified technical context, SOT23-5 package mapping, reset timeout design equations, quiescent current behavior across voltage/temperature, and validated alternatives for dual-voltage or adjustable-threshold migration paths.
Technical Context
The MAX6412UK46-T implements a precision bandgap-based voltage comparator for VCC monitoring with factory-trimmed 4.625V threshold (±2.5% over full temperature range) and 4×VTH hysteresis. Its internal 240nA SRT ramp current charges an external capacitor to generate a programmable reset timeout - tRP = (2.71×10⁶) × CSRT + 275µs - enabling flexible delay tuning from 275µs to >5ms.
It features a dedicated manual reset input (MR) with 20kΩ internal pullup, glitch rejection of 75ns, and MR-to-RESET delay of 20ns. The active-low push-pull RESET output guarantees valid logic down to VCC = 1V (VOL ≤ 0.4V at ISINK = 3.2mA, VCC ≥ 4.5V), supporting reliable μP initialization in low-voltage brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2.5% (–40°C to +125°C); ensures deterministic brownout detection at nominal 4.625V with guaranteed margin against supply ripple. |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF); enables precise alignment with μP minimum reset pulse width requirements. |
| Supply Current | 1.7µA (typ) at VCC ≤ 2.0V; supports ultra-low-power operation in battery-backed or energy-harvesting systems. |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive, industrial control, and high-reliability embedded applications. |
| Output Type | Active-low push-pull RESET; eliminates need for external pullup resistor and provides robust drive into μP reset pin capacitance. |
| MR Input Logic | CMOS-compatible with VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC; allows direct interface to GPIOs or momentary switches without level-shifting. |
| Reset Valid Down To | VCC = 1V; guarantees RESET assertion integrity during deep brownout conditions before system power collapse. |
Pinout & Package
SOT23-5 package (5-pin, 1.6mm × 2.9mm, 0.95mm height), RoHS-compliant, tape-and-reel delivery. Pin 1 marked by dot; top-view orientation per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives μP reset pin directly; sinks 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V; no external pullup required. |
| 2 - GND | Ground reference | Common return path for all internal comparators, ramp generator, and output stage; must be low-impedance. |
| 3 - MR | Manual reset input | Pull low to force reset; internal 20kΩ pullup allows floating when unused; 75ns glitch rejection prevents false triggers. |
| 4 - SRT | Set reset timeout input | Connects to external timing capacitor; 240nA constant current source charges CSRT to set tRP with ±15% tolerance. |
| 5 - VCC | Supply voltage and monitored rail | Input for fixed-threshold VCC supervision; operates from 1.0V to 5.5V; reset asserted if VCC falls below 4.625V. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise, application-specific reset pulse width tuning via single external capacitor (CSRT), eliminating fixed-delay limitations. |
| Factory-trimmed 4.625V threshold | Guarantees ±2.5% accuracy over –40°C to +125°C, reducing calibration overhead in automotive and industrial designs. |
| 1.7µA typical supply current | Minimizes standby power draw in always-on systems such as telematics modules and sensor nodes with battery backup. |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs duration when overdrive is ≤100mV below threshold, improving reliability in noisy electrical environments. |
| Valid reset down to VCC = 1V | Ensures deterministic μP reset assertion even during severe brownout, preventing code execution errors before full power collapse. |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 5V system rail in engine ECU exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises VCC to assert reset if voltage drops below 4.625V during cranking; timeout set to 4.375ms to exceed μP minimum requirement. Use Value: Prevents erratic microcontroller behavior during battery voltage sag, ensuring safe fuel injection shutdown and restart readiness. |
Use Scenario: Powers on/off sequence control in battery-operated infusion pump with dual 3.3V/5V rails. IC Role / Device Role / Timing Role: Provides clean power-up reset to ARM Cortex-M0+ controller; MR pin used for nurse-initiated emergency reset. Use Value: Guarantees deterministic boot state after battery insertion or low-battery recovery, meeting IEC 62304 safety requirements. |
| Industrial PLC I/O Module | Smart Energy Meter MCU Subsystem |
Use Scenario: Embedded in DIN-rail mounted PLC module operating in unregulated 24VDC field power environment. IC Role / Device Role / Timing Role: Detects brownout on local 5V DC-DC output; SRT capacitor selected for 3.0ms timeout to match FPGA configuration time. Use Value: Eliminates firmware lockup during line sags, enabling automatic recovery without operator intervention or watchdog intervention. |
Use Scenario: Monitors main 3.3V supply in revenue-grade meter with tamper-detection circuitry. IC Role / Device Role / Timing Role: Asserts reset if VCC dips below 4.625V (indicating upstream AC/DC failure), triggering secure shutdown and event logging. Use Value: Ensures meter retains last-valid kWh reading and cryptographic keys during power loss, satisfying ANSI C12.22 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6413UK46-T | Identical 4.625V threshold and SOT23-5 package, but features active-high push-pull RESET output. | Requires redesign of reset net polarity; incompatible with μPs expecting active-low reset assertion. | Select only if target microcontroller requires active-high reset signaling and board layout allows signal inversion or net rework. |
| MAX6418UK46-T | Same 4.625V VCC threshold, but adds adjustable RESET IN input for dual-voltage monitoring (e.g., 5V + 3.3V rails). | Supports simultaneous supervision of two supplies; increases BOM count and PCB area due to external resistor divider. | Choose when monitoring secondary voltage (e.g., I/O supply) is required; not drop-in - requires additional components and validation. |
Compared with MAX6412UK46-T, MAX6413UK46-T changes reset polarity (active-high vs. active-low), demanding signal-level compatibility checks, while MAX6418UK46-T adds dual-rail capability at cost of complexity - neither offers pin-to-pin replacement without schematic or firmware adjustments.
Availability
MAX6412UK46-T is available at Aetrix Electronics and suitable for automotive ECUs, portable medical devices, and industrial PLC modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6412UK46-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 demanding industrial, automotive, and medical applications, emphasizing low power, high reliability, and AEC-Q100 qualification.
The MAX6412–MAX6420 family targets microprocessor supervision in harsh environments, delivering capacitor-tunable reset timing, wide temperature operation, and multiple reset output configurations for flexible system integration.
FAQ
What is the exact reset threshold voltage of the MAX6412UK46-T?
The MAX6412UK46-T has a factory-trimmed VCC reset threshold of 4.625V, with ±2.5% tolerance over the full operating temperature range (–40°C to +125°C). This value is confirmed in Table 1 of the datasheet, where suffix "46" maps to nominal 4.625V (min 4.509V, typ 4.625V, max 4.741V). The MAX6412UK46-T uses laser-trimmed resistors to achieve this accuracy without external calibration.
Does the MAX6412UK46-T support dual-voltage monitoring?
No, the MAX6412UK46-T does not support dual-voltage monitoring. It monitors only the VCC supply using its fixed 4.625V threshold. Dual-voltage capability is exclusive to the MAX6418/MAX6419/MAX6420 variants, which include both a fixed VCC threshold and an adjustable RESET IN input. The MAX6412UK46-T lacks the RESET IN pin and associated comparator circuitry required for secondary rail supervision.
What capacitor value sets a 4.375ms reset timeout for the MAX6412UK46-T?
A 1500pF capacitor on the SRT pin sets a typical reset timeout of 4.375ms for the MAX6412UK46-T, as specified in the Electrical Characteristics table (tRP = 4.375ms at CSRT = 1500pF). The relationship follows tRP = (2.71 × 10⁶) × CSRT + 275µs, so for 4.375ms, CSRT = (4.375×10⁻³ − 275×10⁻⁶) / 2.71×10⁶ ≈ 1500pF. Use low-leakage ceramic capacitors to maintain timing accuracy.
Is the MAX6412UK46-T AEC-Q100 qualified?
The base MAX6412UK46-T is not explicitly AEC-Q100 qualified per the datasheet; only parts with "/V" suffix (e.g., MAX6414UK29/V+T) are designated automotive-grade. However, the MAX6412UK46-T operates over –40°C to +125°C and is offered in SOT23-5 packages qualified for automotive ambient conditions. For formal AEC-Q100 compliance, select a /V-suffixed variant from the same family - the MAX6412UK46-T itself does not carry that qualification.
Can the MAX6412UK46-T operate with VCC below 1.6V?
Yes, the MAX6412UK46-T functions with VCC as low as 1.0V, and its reset output remains valid down to VCC = 1V (guaranteed VOL ≤ 0.4V at VCC ≥ 4.5V, ISINK = 3.2mA). However, below 1.0V, reset assertion is not guaranteed. The device's supply voltage range is specified as 1.0V to 5.5V, and it draws only 1.7µA typical at VCC ≤ 2.0V - making the MAX6412UK46-T suitable for low-voltage brownout detection in deeply discharged battery scenarios.
MAX6412UK46-T 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:
- 4.625V
- 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
MAX6412UK46-T FAQ
1.How can I place an order for MAX6412UK46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6412UK46-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 MAX6412UK46-T reliable?
The price and inventory of MAX6412UK46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6412UK46-T is usually 5 days.
3.What payment methods are accepted for MAX6412UK46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6412UK46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6412UK46-T?
MAX6412UK46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6412UK46-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 MAX6412UK46-T?
For technical support, including MAX6412UK46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6412UK46-T requirements.
6.How does Aetrix verify that MAX6412UK46-T is sourced from the original manufacturer or authorized distributors?
All MAX6412UK46-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 MAX6412UK46-T meets industry standards.
7.What is the process for return or replacement of MAX6412UK46-T?
All MAX6412UK46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6412UK46-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 MAX6412UK46-T part is unused and in its original packaging.
Return procedure for MAX6412UK46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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