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Analog Devices Inc./Maxim Integrated MAX6418UK31+T
- Part No.:
- MAX6418UK31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK31+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,259
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Product details
Overview
MAX6418UK31+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (3.075V nominal, ±2.5% over temperature) and one adjustable RESET IN input (1.26V threshold, monitoring voltages down to 1.26V). 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 automotive-grade SOT23-5 packaging. It is used in battery-powered controllers and embedded systems requiring reliable dual-rail power monitoring.
For engineers reviewing the MAX6418UK31+T datasheet, MAX6418UK31+T pinout, MAX6418UK31+T application, or MAX6418UK31+T equivalent, key selection criteria include its dual-threshold architecture (fixed + adjustable), guaranteed RESET validity down to VCC = 1V, 1.7µA typical quiescent current at 2V, SOT23-5 footprint compatibility, and AEC-Q100 qualification for automotive use.
Technical Context
The MAX6418UK31+T implements dual independent voltage monitoring: a laser-trimmed internal comparator for VCC (3.075V ±2.5%) and an external resistor-divider–based comparator for RESET IN (1.26V reference). Reset assertion occurs if either voltage falls below its threshold or MR is pulled low.
Reset deassertion is controlled by a 240nA current source charging an external capacitor on the SRT pin; the resulting ramp to 0.65V determines the timeout period (tRP = 2.71×10⁶ × CSRT + 275µs). The active-low push-pull RESET output drives logic-compatible loads with VOL ≤ 0.4V at 3.2mA sink and VOH ≥ 0.8×VCC at 800µA source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.075V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection for 3.3V rails |
| RESET IN Threshold | 1.26V fixed reference - enables precise monitoring of auxiliary rails (e.g., 1.8V, 2.5V) via external resistor divider |
| Quiescent Current | 1.7µA typical at VCC ≤ 2.0V - supports ultra-low-power battery operation for >10-year runtime |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - configurable to match µP reset timing requirements |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial environments |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up, ensures fast rise/fall times into capacitive loads |
| VCC Validity Limit | RESET guaranteed valid down to VCC = 1.0V - prevents undefined logic states during deep brownout |
Pinout & Package
SOT23-5 package (U5+2A outline, 5-pin, RoHS-compliant, thermal resistance θJA = 255.9°C/W on multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset input directly; sinks up to 3.2mA at VCC ≥ 4.5V; no external pull-up required |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external capacitor (SRT-to-GND) |
| 3 - RESET IN | Adjustable reset input | High-impedance (10nA leakage) node for external resistor divider; sets second monitoring threshold |
| 4 - SRT | Set reset timeout input | 240nA precision current source; connects to external timing capacitor (low-leakage ceramic recommended) |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Powers device and feeds internal VCC comparator; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main VCC (3.075V) and auxiliary rail (via RESET IN) - eliminates need for two discrete supervisors |
| Capacitor-programmable reset timeout | External SRT capacitor sets delay from 275µs to 5.75ms - avoids fixed-timing limitations of monolithic solutions |
| Manual reset with internal pullup | MR pin includes 20kΩ internal pullup - simplifies front-panel reset implementation with single momentary switch to GND |
| AEC-Q100 qualified | Qualified per AEC-Q100 Rev G Grade 0 (-40°C to +125°C) - meets automotive reliability and stress-test requirements |
| Low supply current at low VCC | 1.7µA typical at VCC = 2.0V - enables long-life operation in energy-constrained IoT sensor nodes |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V system supply and 3.3V microcontroller core voltage in engine control modules exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET when either rail drops below specification, with timeout calibrated to MCU boot sequence. Use Value: Prevents erratic ECU behavior during cold cranking (low-battery transients) and hot soak conditions, meeting ISO 16750-2 pulse test requirements. | Use Scenario: Ensures safe restart after power interruption in battery-operated infusion pumps delivering critical drug dosing. IC Role / Device Role / Timing Role: Supervises main 3.3V logic rail and backup 1.8V real-time clock domain, triggering controlled shutdown and recovery. Use Value: Guarantees deterministic state restoration within 5ms of power resumption, satisfying IEC 62304 Class C software safety requirements. |
| Industrial PLC I/O Module | Portable Test Equipment |
Use Scenario: Provides fail-safe reset coordination across isolated 24V field bus interface and 3.3V ARM Cortex-M4 processor in harsh factory environments. IC Role / Device Role / Timing Role: Monitors isolated DC-DC output (via RESET IN) and processor VCC, with MR enabling field-service reset without power cycle. Use Value: Eliminates spurious resets from EMI-induced transients using 75ns MR glitch rejection and power-supply transient immunity. | Use Scenario: Maintains stable operation in handheld oscilloscopes and multimeters powered by rechargeable Li-ion cells with varying voltage profiles. IC Role / Device Role / Timing Role: Tracks declining battery voltage (via RESET IN divider) and regulated 3.3V supply, initiating graceful shutdown before brownout. Use Value: Extends usable battery life by 12% versus fixed-threshold supervisors, due to accurate low-VCC detection down to 1.26V reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBVR | Single fixed 3.3V threshold only; no adjustable input or dual-monitoring capability | Only suitable for single-rail systems; cannot replace dual-voltage supervision function | Select only if application requires only VCC monitoring and lower cost is prioritized over flexibility |
| TPS3808G33DBVR | Fixed 3.3V threshold with programmable timeout (no adjustable input); higher ICC (8µA typ) | Lacks RESET IN functionality - cannot monitor auxiliary rails like 1.8V or 2.5V domains | Choose when SOT23-6 footprint is acceptable and dual-rail monitoring is unnecessary |
Compared with TLV809E33DBVR and TPS3808G33DBVR, the MAX6418UK31+T uniquely delivers true dual-voltage supervision in a 5-pin SOT23, enabling compact designs for multi-rail systems while maintaining ultra-low quiescent current and automotive qualification.
Availability
MAX6418UK31+T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK31+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 high-performance analog and mixed-signal semiconductor solutions for automotive, industrial, and computing markets.
The MAX6412–MAX6420 product line delivers low-power, capacitor-adjustable microprocessor supervisors optimized for dual-voltage monitoring in space-constrained, thermally demanding applications such as automotive body electronics and portable medical devices.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK31+T?
The MAX6418UK31+T has a factory-trimmed VCC reset threshold of 3.075V nominal, with ±2.5% accuracy over the full operating temperature range (-40°C to +125°C). This value corresponds to suffix "31" in the ordering code, per Table 1 of the datasheet. The threshold is laser-trimmed for precision and does not require external calibration.
Does MAX6418UK31+T support manual reset functionality?
Yes, the MAX6418UK31+T supports manual reset via the MR pin (Pin 3 in MAX6412/MAX6413/MAX6414 variants, but Pin 3 is RESET IN for MAX6418). Correction: MR is not present on MAX6418UK31+T. The MAX6418 series replaces MR with RESET IN for dual monitoring. Manual reset must be implemented externally by shorting RESET IN to ground through a switch, leveraging the adjustable input's 1.26V threshold to trigger reset.
What is the minimum VCC required for MAX6418UK31+T to guarantee valid RESET output?
The MAX6418UK31+T guarantees valid RESET output down to VCC = 1.0V. Below this voltage, the output driver strength degrades significantly. For applications requiring defined logic states at VCC < 1.0V, a 100kΩ pulldown resistor from RESET to GND is recommended to hold the output low, as documented in the "Ensuring a Valid RESET Down to VCC = 0V" section.
Can MAX6418UK31+T monitor a 1.8V rail using the adjustable input?
Yes, the MAX6418UK31+T can monitor a 1.8V rail using its RESET IN pin. With a 1.26V internal reference, a resistor divider (e.g., R1 = 428kΩ, R2 = 1MΩ) sets VMON_TH = 1.26V × (R1 + R2)/R2 ≈ 1.8V. The high-impedance input (10nA leakage) minimizes divider current, preserving battery life in portable applications.
Is MAX6418UK31+T qualified for automotive applications?
Yes, the MAX6418UK31+T is AEC-Q100 qualified (Grade 0, -40°C to +125°C) and offered in /V automotive-grade versions. The "+T" suffix indicates lead-free tape-and-reel packaging, and the device meets automotive reliability standards including HTOL, TC, and ESD testing per AEC-Q100 Rev G.
MAX6418UK31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6418UK31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK31+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 MAX6418UK31+T reliable?
The price and inventory of MAX6418UK31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK31+T is usually 5 days.
3.What payment methods are accepted for MAX6418UK31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK31+T?
MAX6418UK31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK31+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 MAX6418UK31+T?
For technical support, including MAX6418UK31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK31+T requirements.
6.How does Aetrix verify that MAX6418UK31+T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK31+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 MAX6418UK31+T meets industry standards.
7.What is the process for return or replacement of MAX6418UK31+T?
All MAX6418UK31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK31+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 MAX6418UK31+T part is unused and in its original packaging.
Return procedure for MAX6418UK31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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