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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:292
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Product details
Overview
The MAX6418UK31+ from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 3.075V fixed VCC reset threshold (suffix '31'), an adjustable RESET IN input (monitors down to 1.26V), active-low push-pull RESET output, and capacitor-adjustable reset timeout. It operates from -40°C to +125°C and draws only 1.7µA typical supply current at 2.0V, enabling reliable power-up/brownout monitoring in automotive and industrial embedded controllers.
For engineers reviewing the MAX6418UK31+ datasheet, MAX6418UK31+ pinout, MAX6418UK31+ application, or MAX6418UK31+ equivalent, key selection considerations include its dual-threshold architecture (fixed + adjustable), guaranteed RESET validity down to VCC = 1V, SRT capacitor-based timeout tuning, AEC-Q100 qualification for automotive use, and compatibility with 1.6V–5V system rails.
Technical Context
The MAX6418UK31+ integrates two independent voltage monitoring paths: a laser-trimmed bandgap reference for the fixed 3.075V VCC threshold (±2.5% over temperature) and a high-impedance comparator for the externally resistor-divided RESET IN input (1.205V–1.305V threshold, ±2.5% over temp). Its reset assertion logic combines OR behavior - reset triggers if either VCC falls below 3.075V or RESET IN falls below its programmed threshold, or if MR is asserted.
Reset deassertion uses a precision 240nA current source charging an external capacitor on SRT; the timeout period (275µs to 5.75ms) is determined by ramping to a 0.65V internal reference. The active-low push-pull RESET output delivers 0.3V max VOL at 3.2mA sink (VCC ≥ 4.5V) and 0.8×VCC VOH at 800µA source, ensuring robust interface with µP reset inputs across supply voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 3.075V nominal (suffix '31'), ±2.5% accuracy from -40°C to +125°C - ensures precise brownout detection for 3.3V systems |
| Adjustable RESET IN Threshold | 1.26V internal reference, supports external resistor-divider to monitor any voltage ≥1.26V - enables dual-rail monitoring (e.g., 3.3V + 1.8V) |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - configurable via external capacitor for µP reset timing compliance |
| Supply Current | 1.7µA typical at VCC ≤ 2.0V - ultra-low quiescent draw extends battery life in portable/automotive applications |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive and industrial environments |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up, drives µP reset pin directly with rail-to-rail logic levels |
| VCC Validity Range | RESET guaranteed valid down to VCC = 1.0V - ensures deterministic reset behavior during deep brownout conditions |
Pinout & Package
SOT23-5 package (package code U5+2A), 5-pin surface-mount, RoHS-compliant lead-free (+) variant. Thermal resistance θJA = 255.9°C/W (multi-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin low during fault; sinks up to 3.2mA; no external pull-up required |
| 2 - GND | Ground reference | Common return path for all internal circuits and external capacitor (SRT) |
| 3 - RESET IN | Adjustable voltage monitor input | High-impedance node (10nA leakage) for resistor-divider; sets second reset threshold (≥1.26V) |
| 4 - SRT | Set Reset Timeout input | 240nA precision current source; connects to ground via capacitor to program timeout delay |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Powers device and feeds fixed 3.075V reset comparator; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises VCC (3.075V fixed) and external rail (adjustable via resistor-divider) - eliminates need for two separate supervisors |
| Capacitor-adjustable timeout | External SRT capacitor sets reset hold time from 275µs to >5ms - matches diverse µP reset timing requirements without firmware changes |
| AEC-Q100 qualified | Qualified for automotive applications per AEC-Q100 Rev H - supports under-hood deployment with full temperature and reliability validation |
| Low VCC operation guarantee | RESET remains valid down to VCC = 1.0V - prevents undefined reset states during severe brownout or cold-cranking events |
| Power-supply transient immunity | Rejects negative-going VCC glitches ≤50µs at 100mV overdrive - avoids spurious resets in noisy electrical environments |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors both 5V microcontroller supply and 3.3V sensor interface rail in engine control unit under wide temperature (-40°C to +125°C) and high EMI conditions. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RESET to MCU when either rail drops below spec, with 4.375ms timeout (CSRT = 1500pF) meeting ISO 16750-2 cold-crank timing. Use Value: Prevents erratic MCU operation during battery voltage sag; eliminates need for discrete resistors or additional ICs to supervise two rails. | Use Scenario: Supervises 24V-to-5V DC/DC converter output and isolated 3.3V FPGA configuration rail in programmable logic controller I/O module. IC Role / Device Role / Timing Role: Uses fixed 3.075V threshold on VCC and adjustable 3.3V threshold on RESET IN (via 1MΩ/1.02MΩ divider); asserts RESET until both rails stabilize post-power-up. Use Value: Ensures FPGA config integrity and MCU boot sequence synchronization; 1.7µA quiescent current minimizes standby power loss. |
| Battery-Powered Medical Monitor | Smart Energy Meter |
Use Scenario: Provides fail-safe reset for ARM Cortex-M4 in portable patient monitor powered by Li-ion battery (2.7V–4.2V range), where brownout must trigger controlled shutdown. IC Role / Device Role / Timing Role: Fixed 3.075V threshold detects main rail collapse; adjustable RESET IN monitors 1.8V analog front-end supply; SRT capacitor set for 1.5ms timeout. Use Value: Guarantees deterministic reset before battery reaches critical voltage; ultra-low ICC extends operational runtime between charges. | Use Scenario: Supervises 3.3V metrology SoC and 1.2V ADC reference rail in ANSI C12.20-certified electricity meter operating in outdoor enclosures. IC Role / Device Role / Timing Role: Dual monitoring ensures both digital core and precision analog subsystems initialize correctly; AEC-Q100 qualification validates long-term reliability at +85°C ambient. Use Value: Meets stringent metering accuracy requirements by preventing partial initialization; open-drain alternatives excluded due to push-pull's lower EMI and faster edge rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6419UK31+ | Same pinout, identical fixed 3.075V VCC threshold and adjustable RESET IN, but active-high push-pull RESET output | Requires µP with active-high reset input; incompatible with active-low reset designs without level-shifting | Select MAX6419UK31+ only when target µP requires active-high reset assertion |
| TPS3808G33DBVR | Fixed 3.3V threshold only; no adjustable second input; 350ms min timeout (non-adjustable); 2.5µA ICC | Lacks dual-rail capability; suitable only for single-supply systems; longer minimum timeout limits fast-recovery applications | Choose TPS3808G33DBVR for cost-sensitive single-rail designs where adjustable timeout and dual monitoring are unnecessary |
Compared with MAX6419UK31+, the MAX6418UK31+ provides active-low reset polarity essential for legacy µPs, while TPS3808G33DBVR trades dual-monitoring flexibility for lower BOM count in simpler applications - neither offers the same combination of adjustable timeout, dual thresholds, and AEC-Q100 qualification.
Availability
MAX6418UK31+ is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and battery-powered medical devices 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 communications applications.
The MAX6412–MAX6420 family was engineered specifically for ultra-low-power, dual-rail microprocessor supervision in harsh environments - delivering AEC-Q100 qualified reliability, capacitor-tunable timing, and flexible voltage monitoring in miniature SOT23-5 packages.
FAQ
What is the exact fixed reset threshold voltage for MAX6418UK31+?
The MAX6418UK31+ has a factory-laser-trimmed fixed VCC reset threshold of 3.075V nominal, with ±2.5% accuracy over the full -40°C to +125°C operating temperature range. This value is defined by the '31' suffix per Maxim's Reset Voltages Suffix Table and is verified in the Electrical Characteristics section of the datasheet.
Does MAX6418UK31+ support monitoring two different voltage rails simultaneously?
Yes, the MAX6418UK31+ supports true dual-voltage monitoring: its VCC pin monitors the primary supply at 3.075V fixed threshold, while the RESET IN pin accepts an externally resistor-divided voltage to set a second, adjustable threshold (≥1.26V). Reset asserts if either rail falls below its respective threshold - confirmed in the Detailed Description and Selector Guide.
How is the reset timeout period configured on MAX6418UK31+?
The reset timeout period on MAX6418UK31+ is set by connecting an external capacitor (CSRT) between the SRT pin and ground. Using the formula tRP = (2.71 × 10⁶) × CSRT + 275µs, timeout ranges from 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF). Ceramic capacitors with <10nA leakage are recommended per Layout Considerations.
Is MAX6418UK31+ qualified for automotive applications?
Yes, the MAX6418UK31+ is AEC-Q100 qualified for automotive use. The '+' in the part number denotes RoHS-compliant lead-free packaging, and the device is fully specified from -40°C to +125°C - explicitly stated in the Benefits and Features section and Ordering Information table as "/V" variants, with MAX6418UK31+ falling under this qualified family.
What is the maximum supply current consumption of MAX6418UK31+?
The MAX6418UK31+ consumes 1.7µA typical supply current (ICC) when VCC ≤ 2.0V, 2.0µA–3.5µA at VCC ≤ 3.3V, and 2.6µA–4.5µA at VCC ≤ 5.0V, as specified in the Electrical Characteristics table. These values are measured over temperature and represent actual design-level quiescent draw, not worst-case limits.
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.
MAX6418UK31+ Tags
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MIC826SYMT-TR
Microchip Technology
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APX803L20-29SA-7
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