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Analog Devices Inc./Maxim Integrated MAX6418UK31
- Part No.:
- MAX6418UK31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK31.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,925
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Product details
Overview
MAX6418UK31 from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (3.075V, ±2.5%) and one adjustable RESET IN input (1.26V threshold) for monitoring secondary supply rails. It features an active-low push-pull RESET output, capacitor-adjustable reset timeout (275µs to 5.75ms), manual reset capability via MR pin, and operates across -40°C to +125°C in SOT23-5. It is used in automotive engine control units to monitor both main 5V logic rail and auxiliary 3.3V sensor supply.
For engineers reviewing the MAX6418UK31 datasheet, MAX6418UK31 pinout, MAX6418UK31 application, or MAX6418UK31 equivalent, key selection considerations include its dual-threshold architecture, guaranteed RESET validity down to VCC = 1V, 1.7µA typical quiescent current, AEC-Q100 qualification (for /V variants), and SRT capacitor-based timeout tuning - critical for brownout recovery timing in safety-critical embedded systems.
Technical Context
The MAX6418UK31 integrates two independent voltage-monitoring comparators: one laser-trimmed bandgap reference for VCC (3.075V nominal, suffix "31" per Table 1), and one precision 1.26V internal reference for the external RESET IN divider network. Reset assertion occurs if either VCC falls below its threshold or RESET IN voltage drops below 1.26V × (R1+R2)/R2.
Its reset timeout is generated by a 240nA constant-current source charging an external capacitor (CSRT) on the SRT pin to a 0.65V ramp threshold; deassertion occurs when CSRT reaches that voltage after all fault conditions clear. The MR pin provides asynchronous manual reset with 20kΩ internal pullup and 1µs minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.075V ±2.5% (suffix "31"); ensures reliable detection of 3.3V rail brownout at system-level tolerance margins |
| RESET IN Threshold | 1.26V fixed reference; enables precise monitoring of any secondary voltage ≥1.26V using external resistor divider |
| Quiescent Current | 1.7µA typical at VCC ≤2.0V; supports ultra-low-power battery-backed systems over full temperature range |
| Reset Timeout Range | 275µs to 5.75ms (with CSRT = 0F to 1500pF); allows fine-grained alignment with µP reset hold-time requirements |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive and industrial control environments |
| RESET Output Type | Active-low push-pull; drives µP reset pin directly without external pullup, sinking 50µA at 0.3V VOL |
| Supply Voltage Range | 1.0V to 5.5V; guarantees valid reset assertion even during deep brownout down to 1V VCC |
Pinout & Package
SOT23-5 package: compact 2.9mm × 1.6mm surface-mount outline with gull-wing leads, optimized for high-density automotive PCB layouts and reflow-compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives microprocessor reset input directly; sinks 50µA at 0.3V max VOL, sources 200µA at 0.8×VCC min VOH |
| 2 - GND | Ground reference | Common return path for all internal comparators, current sources, and output stage; must be low-impedance |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (10nA leakage) for external resistor-divider; sets secondary voltage threshold via 1.26V internal reference |
| 4 - SRT | Set Reset Timeout input | 240nA precision current source pin; connects to ground via CSRT capacitor to program timeout period (tRP = 2.71×10⁶×CSRT + 275µs) |
| 5 - VCC | Power supply and primary monitor input | Supplies internal circuitry and feeds fixed-threshold VCC monitor; valid operation from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main VCC (3.075V) and secondary rail (e.g., 3.3V, 2.5V, 1.8V) via external divider - eliminates need for two discrete supervisors |
| Capacitor-programmable reset timeout | Enables precise, board-level tuning of reset duration (275µs–5.75ms) without firmware changes or BOM revisions |
| AEC-Q100 qualified option | Available as MAX6418UK31/V+T variant; certified for automotive applications including powertrain and ADAS modules |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout - critical for fail-safe shutdown in safety-critical systems |
| Manual reset with internal pullup | MR pin includes 20kΩ internal pullup; requires only a momentary switch to ground - no external components needed |
Applications
| Engine Control Unit (ECU) | Medical Infusion Pump |
|---|---|
|
Use Scenario: Monitoring both 5V MCU supply and 3.3V analog sensor rail in diesel ECU under wide temperature and vibration stress. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET until both rails stabilize post-ignition, with timeout tuned to MCU boot sequence. Use Value: Prevents erratic MCU operation during cold cranking by ensuring synchronized release of reset across two critical domains. |
Use Scenario: Ensuring safe restart after power interruption in battery-powered infusion pump with isolated motor driver and analog front-end. IC Role / Device Role / Timing Role: Supervising main 3.3V logic rail and isolated 5V motor driver supply; MR pin enables clinician-initiated soft reset. Use Value: Guarantees deterministic state recovery without data corruption or unintended dosing upon power restoration. |
| Industrial PLC I/O Module | Automotive Body Control Module (BCM) |
|
Use Scenario: Protecting programmable logic controller I/O expansion module against undervoltage on 24V-to-5V DC/DC output and isolated 3.3V FPGA rail. IC Role / Device Role / Timing Role: Detecting faults on both primary and isolated secondary supplies; RESET output held active until both exceed thresholds + timeout. Use Value: Eliminates spurious I/O toggling during transient line dips, improving system reliability in factory floor environments. |
Use Scenario: Supervising 12V-derived 5V microcontroller supply and 3.3V CAN transceiver rail in vehicle door module with wake-on-CAN capability. IC Role / Device Role / Timing Role: Dual-rail monitoring with low ICC (1.7µA typ) enabling always-on supervision without excessive battery drain. Use Value: Enables robust wake-up sequencing and prevents CAN bus lockup due to partial rail collapse during sleep/wake transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK31+T | Same dual-threshold architecture but open-drain RESET output; requires external pullup resistor | Better suited for level-shifting or wired-OR reset buses; incompatible with direct-drive µP reset pins requiring push-pull | Select MAX6420UK31+T only when interfacing to mixed-voltage systems or shared reset lines |
| TPS3808G33DBVR | Fixed 3.3V VDD threshold only; no adjustable RESET IN input; 350ms fixed timeout (non-adjustable) | Lacks secondary rail monitoring capability; suitable only for single-supply systems with standard reset timing | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where dual monitoring is unnecessary |
Compared with MAX6418UK31, MAX6420UK31+T trades push-pull drive for open-drain flexibility, while TPS3808G33DBVR sacrifices dual-rail supervision and timeout adjustability for lower unit cost and simpler layout - making MAX6418UK31 the optimal choice for safety-critical dual-supply systems requiring precise, field-tunable reset timing.
Availability
MAX6418UK31 is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK31 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 reliability, low power, and high integration.
The MAX6412–MAX6420 family was engineered specifically for robust microprocessor supervision in harsh environments, combining dual-rail monitoring, capacitor-tunable timing, and AEC-Q100 qualification to address fail-safe requirements in automotive and safety-critical embedded systems.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK31?
The MAX6418UK31 has a factory-trimmed VCC reset threshold of 3.075V, with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is defined by the "31" suffix per Maxim's Reset Voltages Suffix Table and applies exclusively to the VCC monitor path - not the adjustable RESET IN input.
Does MAX6418UK31 support manual reset functionality?
Yes, MAX6418UK31 includes a dedicated MR (manual reset) pin (Pin 3 in SOT23-5 top view). It features a 20kΩ internal pullup resistor, accepts logic-low pulses as short as 1µs, and holds RESET asserted for the full capacitor-programmed timeout period after the MR signal is released - enabling reliable operator-initiated resets without external components.
How is the reset timeout period set on MAX6418UK31?
The reset timeout period on MAX6418UK31 is set by connecting an external capacitor (CSRT) between the SRT pin (Pin 4) and ground. The relationship is tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT in farads. For example, a 1500pF capacitor yields a typical timeout of 4.375ms, as verified in the Electrical Characteristics table.
Is MAX6418UK31 qualified for automotive applications?
The base MAX6418UK31 is rated for -40°C to +125°C operation but is not AEC-Q100 qualified. However, the automotive-grade variant MAX6418UK31/V+T is explicitly qualified per AEC-Q100 Rev H, with additional testing for reliability, thermal cycling, and humidity resistance - required for powertrain and body electronics applications.
What is the function of the RESET IN pin on MAX6418UK31?
The RESET IN pin (Pin 3) on MAX6418UK31 connects to the center tap of an external resistor divider network, enabling precise monitoring of a secondary voltage rail (e.g., 3.3V, 2.5V). Its internal 1.26V reference compares against the divided voltage; reset asserts when VMON_TH = 1.26V × (R1 + R2)/R2 falls below the threshold - supporting flexible dual-rail supervision.
MAX6418UK31 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:
- 3.075V, Adj
- 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
MAX6418UK31 FAQ
1.How can I place an order for MAX6418UK31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK31 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 MAX6418UK31 reliable?
The price and inventory of MAX6418UK31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK31 is usually 5 days.
3.What payment methods are accepted for MAX6418UK31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK31?
MAX6418UK31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK31 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 MAX6418UK31?
For technical support, including MAX6418UK31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK31 requirements.
6.How does Aetrix verify that MAX6418UK31 is sourced from the original manufacturer or authorized distributors?
All MAX6418UK31 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 MAX6418UK31 meets industry standards.
7.What is the process for return or replacement of MAX6418UK31?
All MAX6418UK31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK31, 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 MAX6418UK31 part is unused and in its original packaging.
Return procedure for MAX6418UK31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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