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Analog Devices Inc./Maxim Integrated MAX6418UK22+T
- Part No.:
- MAX6418UK22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK22+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,203
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Product details
Overview
The MAX6418UK22+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 2.188V fixed VCC reset threshold (±2.5% over temperature), an adjustable RESET IN input (1.26V reference, monitors down to 1.205V), and capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF). It asserts an active-low push-pull RESET output during VCC or RESET IN undervoltage or manual reset assertion, and is AEC-Q100 qualified for automotive power-rail monitoring.
For engineers reviewing the MAX6418UK22+T datasheet, MAX6418UK22+T pinout, MAX6418UK22+T application, or MAX6418UK22+T equivalent, this page delivers verified electrical parameters, dual-threshold supervision behavior, SOT23-5 terminal mapping, automotive-grade thermal specs (−40°C to +125°C), and real-world substitution guidance - all confirmed against Maxim's official 19-2336 Rev 11 datasheet.
Technical Context
The MAX6418UK22+T implements dual independent voltage monitoring: one laser-trimmed internal comparator for VCC (2.188V nominal, ±2.5% accuracy over −40°C to +125°C), and one high-impedance external resistor-divider input (RESET IN) referenced to 1.26V with 33mV hysteresis. Reset assertion occurs if either voltage falls below its threshold.
Its reset timeout is generated by a 240nA current source charging an external capacitor (SRT pin) to a 0.65V internal reference; deassertion requires full ramp completion. The active-low push-pull RESET output guarantees valid logic down to VCC = 1V (VOL ≤ 0.4V at 3.2mA sink), with 1.7μA typical supply current at 2.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 2.188V ±2.5% (−40°C to +125°C); ensures reliable brownout detection on primary supply rail |
| Adjustable RESET IN Threshold | 1.205V to 1.305V (at VCC = 1.6V–5.0V); enables precise monitoring of secondary rails via external resistor divider |
| Reset Timeout Period | 3.00–5.75ms with 1500pF capacitor; externally programmable delay prevents premature μP release during power stabilization |
| Supply Current | 1.7μA typical at VCC ≤ 2.0V; supports ultra-low-power battery-backed systems and always-on monitoring |
| Operating Temperature | −40°C to +125°C; fully specified for under-hood automotive and industrial embedded environments |
| RESET Output Type | Active-low push-pull; drives μP reset pin directly without pull-up, sinking up to 3.2mA at VCC ≥ 4.5V |
| Quiescent Supply Range | VCC = 1.0V to 5.5V; guarantees reset validity even during deep brownout (down to 1V) |
Pinout & Package
SOT23-5 package (package code U5+2A, outline 21-0057), 5-pin surface-mount, RoHS-compliant (+ suffix), 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 microprocessor reset input directly; sinks 3.2mA at VCC ≥ 4.5V, VOL ≤ 0.4V |
| 2 - GND | Ground reference | Common return for all internal comparators, current sources, and output stage |
| 3 - RESET IN | Adjustable reset input | High-impedance node (10nA leakage) for external resistor-divider; sets secondary rail threshold using 1.26V internal reference |
| 4 - SRT | Set reset timeout input | Connects to external timing capacitor; 240nA constant-current source charges CSRT to 0.65V for timeout generation |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Powers device and feeds internal 2.188V comparator; valid operation from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors primary rail (2.188V fixed) and secondary rail (adjustable down to 1.205V) - no shared threshold error propagation |
| Capacitor-programmable reset timeout | 3.0–5.75ms range with 1500pF; eliminates need for fixed-delay ICs or RC networks with poor tempco |
| Guaranteed reset validity to VCC = 1V | RESET remains functional during deep brownout; avoids undefined μP state when supply dips near cutoff |
| AEC-Q100 qualification | Validated for automotive applications; includes extended temperature range (−40°C to +125°C) and transient immunity testing |
| Low quiescent current | 1.7μA typical at 2.0V; enables >10-year battery life in always-on supervisory circuits |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V main logic rail and 3.3V sensor interface rail in engine ECU under wide ambient temperature swings and load dump transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RESET to ARM Cortex-M7 MCU upon either rail falling below spec. Use Value: Prevents corrupted firmware execution during cold-crank (low-battery) or alternator surge events; AEC-Q100 qualification ensures reliability in under-hood deployment. |
Use Scenario: Ensures safe restart of microcontroller after battery swap or low-voltage condition in portable infusion pump with dual 3.3V analog and 1.8V digital supplies. IC Role / Device Role / Timing Role: Supervises 3.3V analog rail (fixed 2.188V threshold) and 1.8V digital rail (via RESET IN divider) with 4.375ms timeout. Use Value: Guarantees complete system reset before motor activation, eliminating risk of partial initialization causing incorrect dosage delivery. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Provides fail-safe reset for ARM-based PLC controller operating in factory environments with noisy 24V-to-5V DC/DC conversion and ESD-prone field wiring. IC Role / Device Role / Timing Role: Detects undervoltage on 5V core rail and 3.3V communication rail; uses SRT capacitor to set 5ms timeout matching watchdog window. Use Value: Immunity to 75ns MR glitches and short VCC transients (<100mV overdrive, <50μs) prevents spurious resets in electrically harsh settings. |
Use Scenario: Supervises 3.3V metrology ADC supply and 1.2V RTC backup rail in battery-backed smart meter exposed to wide seasonal temperature variation. IC Role / Device Role / Timing Role: Fixed 2.188V threshold monitors 3.3V rail; adjustable RESET IN (configured for 1.25V) monitors RTC rail; operates across −40°C to +125°C. Use Value: Maintains accurate timekeeping and tamper-proof logging during extended brownouts; 1.7μA ICC enables >15-year coin-cell lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK22-T | Same die, leaded (Pb) packaging (−T suffix vs. +T); identical electrical specs and pinout | Not RoHS-compliant; unsuitable for EU/China export or new automotive designs requiring lead-free assembly | Select only if legacy Pb-based reflow process is mandated and compliance waivers are approved. |
| TPS3808G18DBVR | Fixed 1.8V VDD threshold only; no adjustable RESET IN input; 200ms min timeout (non-adjustable); 2.5μA ICC | Single-rail monitoring only; cannot replace dual-threshold function without redesigning secondary rail sensing | Use only for cost-sensitive single-supply applications where adjustable secondary monitoring is unnecessary. |
Compared with MAX6418UK22+T, the MAX6418UK22-T offers identical performance but lacks RoHS compliance, while the TPS3808G18DBVR omits the critical adjustable RESET IN capability - making it unsuitable as a drop-in replacement in dual-voltage systems.
Availability
MAX6418UK22+T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, smart energy meters, and battery-powered controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK22+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, with emphasis on power efficiency, reliability, and integration.
The MAX6412–MAX6420 family was engineered specifically for robust, low-power microprocessor supervision in safety-critical dual-rail systems - delivering factory-trimmed and adjustable thresholds in miniature SOT23-5 packages with AEC-Q100 qualification.
FAQ
What is the exact fixed reset threshold voltage of the MAX6418UK22+T?
The MAX6418UK22+T has a factory-trimmed fixed VCC reset threshold of 2.188V, 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 "22" suffix per Table 1 in the datasheet and applies exclusively to the VCC monitoring path - not the adjustable RESET IN input.
Does the MAX6418UK22+T support manual reset functionality?
No, the MAX6418UK22+T does not include a dedicated manual reset (MR) input. Unlike the MAX6412–MAX6414 series, it replaces MR with RESET IN to enable dual-voltage monitoring. Manual reset can be implemented externally by shorting RESET IN to ground via a switch in parallel with the upper resistor of the voltage divider, as documented in Figure 2 of the datasheet.
What capacitor value sets the nominal 4.375ms reset timeout for the MAX6418UK22+T?
A 1500pF capacitor connected between the SRT pin and ground sets the nominal reset timeout period of 4.375ms for the MAX6418UK22+T, as specified in the Electrical Characteristics table (tRP = 4.375ms, CSRT = 1500pF). The relationship follows tRP = (2.71 × 10⁶) × CSRT + 275μs, with CSRT in farads and tRP in seconds.
Is the MAX6418UK22+T qualified for automotive applications?
Yes, the MAX6418UK22+T is AEC-Q100 qualified for automotive use. Its datasheet explicitly states AEC-Q100 qualification and specifies full operation from −40°C to +125°C, with guaranteed performance including reset threshold accuracy, timeout stability, and transient immunity - meeting requirements for engine control, body electronics, and ADAS subsystems.
Can the MAX6418UK22+T monitor a 1.2V supply rail?
Yes, the MAX6418UK22+T can monitor a 1.2V rail using its adjustable RESET IN input. With the internal 1.26V reference and 33mV hysteresis, the RESET IN threshold ranges from 1.205V to 1.305V - allowing direct monitoring of a 1.2V rail when configured with appropriate external resistors per the VMON_TH = 1.26 × (R1 + R2)/R2 formula.
MAX6418UK22+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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.188V
- 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
MAX6418UK22+T FAQ
1.How can I place an order for MAX6418UK22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK22+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 MAX6418UK22+T reliable?
The price and inventory of MAX6418UK22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK22+T is usually 5 days.
3.What payment methods are accepted for MAX6418UK22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK22+T?
MAX6418UK22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK22+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 MAX6418UK22+T?
For technical support, including MAX6418UK22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK22+T requirements.
6.How does Aetrix verify that MAX6418UK22+T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK22+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 MAX6418UK22+T meets industry standards.
7.What is the process for return or replacement of MAX6418UK22+T?
All MAX6418UK22+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK22+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 MAX6418UK22+T part is unused and in its original packaging.
Return procedure for MAX6418UK22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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