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Analog Devices Inc./Maxim Integrated MAX6418UK23+T
- Part No.:
- MAX6418UK23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK23+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,592
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Product details
Overview
The MAX6418UK23+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (2.313V nominal) and one adjustable RESET IN input for monitoring secondary 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 guaranteed valid reset operation down to VCC = 1V. It is used in automotive and industrial embedded systems requiring reliable power-on reset and brownout detection.
For engineers reviewing the MAX6418UK23+T datasheet, MAX6418UK23+T pinout, MAX6418UK23+T application, or MAX6418UK23+T equivalent, key selection criteria include its dual-threshold architecture, SOT23-5 package, 1.7µA typical quiescent current, -40°C to +125°C operating range, and AEC-Q100 qualification eligibility for automotive variants.
Technical Context
The MAX6418UK23+T implements dual independent voltage monitoring: a laser-trimmed VCC threshold (2.313V ±2.5%) and an adjustable RESET IN comparator referenced to 1.26V with external resistor divider. Reset assertion occurs when either voltage falls below its threshold or MR is pulled low.
Reset deassertion is controlled by a precision 240nA current source charging an external capacitor on the SRT pin; timeout is programmable from 275µs to 5.75ms (with 1500pF). 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 | 2.313V ±2.5% over -40°C to +125°C - sets primary supply monitoring point with tight tolerance for stable brownout detection |
| RESET IN Threshold | 1.26V ±33mV hysteresis - enables precise secondary voltage monitoring (e.g., 3.3V, 2.5V rails) using external resistive divider |
| Quiescent Current | 1.7µA typical at VCC ≤ 2.0V - supports ultra-low-power battery-backed or always-on monitoring applications |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - externally programmable delay ensures compatibility with diverse µP reset timing requirements |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive and industrial environments |
| RESET Output Type | Active-low push-pull - provides rail-to-rail logic-level drive without external pull-up, simplifying interface to µP reset inputs |
| Supply Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
Pinout & Package
SOT23-5 package (U5+2A outline, 5-pin, RoHS-compliant lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset input low during fault; sinks up to 3.2mA while maintaining VOL ≤ 0.4V |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external capacitor (SRT) |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (10nA leakage) for external resistor-divider; monitors secondary voltage down to 1.26V |
| 4 - SRT | Set reset timeout capacitor connection | 240nA precision current source charges external CSRT; determines reset hold time per tRP = 2.71×10⁶ × CSRT + 275µs |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Powers device and feeds primary reset comparator; valid operation guaranteed from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises VCC (2.313V) and a user-defined secondary voltage (e.g., 3.3V, 2.5V) with single IC - reduces BOM count and board space |
| Capacitor-adjustable timeout | Programmable reset hold time (275µs–5.75ms) via single external capacitor - eliminates need for fixed-delay parts or complex timing circuits |
| Manual reset input (MR) | Internal 20kΩ pullup allows momentary switch to ground; reset persists for full timeout after release - enables field service and diagnostics |
| Low-power operation | 1.7µA typical ICC at VCC ≤ 2.0V - extends battery life in portable and energy-harvesting systems |
| Automotive-grade support | AEC-Q100 qualified variants available (/V suffix); -40°C to +125°C operation and transient immunity meet automotive ECU requirements |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V microcontroller core rail in engine control units exposed to wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RESET to ARM Cortex-M7 MCU during VCC brownout or VMON_TH undervoltage. Use Value: Prevents erratic code execution during cranking transients; 240nA SRT current source ensures accurate timeout despite temperature drift. | Use Scenario: Supervises 24V field power supply and isolated 5V logic rail in programmable logic controller modules deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation and hold-off for FPGA configuration and real-time OS boot sequence. Use Value: 1.7µA quiescent current minimizes standby power draw; -40°C to +125°C rating ensures reliability in uncooled enclosures. |
| Medical Infusion Pump Controller | Battery-Powered IoT Sensor Node |
Use Scenario: Ensures deterministic startup and fault recovery in Class II medical devices powered from rechargeable Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Monitors battery-derived 3.3V system rail and 1.8V ADC reference rail; asserts RESET if either drops below safe operating level. Use Value: Guaranteed RESET validity down to VCC = 1V prevents undefined MCU state during deep discharge; MR pin enables clinician-initiated recalibration. | Use Scenario: Provides ultra-low-power supply supervision in wireless sensor nodes powered by coin-cell batteries or energy harvesters. IC Role / Device Role / Timing Role: Dual-monitoring of harvested 2.2V storage rail and regulated 1.8V MCU supply, with reset timeout tuned to match BLE radio wake-up latency. Use Value: 1.7µA ICC extends multi-year battery life; SOT23-5 footprint conserves PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK23+T | Same dual-threshold architecture but open-drain RESET output instead of push-pull | Requires external pull-up; better suited for wired-OR reset buses or mixed-voltage logic interfacing | Select when interfacing to multiple µPs sharing a common reset line or when level-shifting across voltage domains is required |
| TPS3808G33DBVR | Fixed 3.3V VCC threshold only; no adjustable RESET IN input; 350ms fixed timeout | Lacks secondary voltage monitoring capability; uses internal timer instead of capacitor-programmable delay | Choose for simpler single-rail systems where 3.3V supervision suffices and fixed timeout is acceptable |
Compared with MAX6420UK23+T and TPS3808G33DBVR, the MAX6418UK23+T uniquely combines factory-trimmed VCC supervision, user-adjustable secondary rail monitoring, and active-low push-pull RESET in a single SOT23-5 package - enabling compact, flexible, and low-power dual-supply reset management without external components.
Availability
MAX6418UK23+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, medical infusion pumps, and battery-powered IoT sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK23+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, mixed-signal, and high-reliability semiconductor solutions for automotive, industrial, communications, and computing markets.
The MAX6412–MAX6420 family was engineered specifically for robust microprocessor reset supervision in harsh environments, emphasizing low quiescent current, dual-rail monitoring flexibility, and capacitor-programmable timing - targeting automotive, medical, and industrial embedded controllers.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK23+T?
The MAX6418UK23+T has a factory-laser-trimmed VCC reset threshold of 2.313V (nominal), with ±2.5% accuracy over the full -40°C to +125°C temperature range. This value is confirmed in the datasheet's Reset Voltages Suffix Table (suffix "23") and Electrical Characteristics section under VTH parameter.
Does MAX6418UK23+T support manual reset functionality?
Yes, the MAX6418UK23+T includes a manual reset (MR) input on pin 3. It features an internal 20kΩ pullup resistor, allowing direct connection of a momentary switch to ground. When asserted, MR forces RESET low for the full timeout period, then releases it - enabling field service, diagnostics, or user-initiated reboots without modifying firmware.
How is the reset timeout period set on MAX6418UK23+T?
The reset timeout period on MAX6418UK23+T 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, yielding 275µs minimum (CSRT = 0F) and 5.75ms maximum (CSRT = 1500pF). Ceramic capacitors with <10nA leakage are recommended.
What is the function of the RESET IN pin on MAX6418UK23+T?
The RESET IN pin (pin 3) on MAX6418UK23+T is a high-impedance input to an adjustable comparator referenced to 1.26V. It accepts a voltage divider network to monitor a secondary supply (e.g., 3.3V or 2.5V rail); reset triggers when that voltage falls below VRST × (R1 + R2)/R2. Leakage current is only 10nA, minimizing divider power loss.
Is MAX6418UK23+T qualified for automotive applications?
The MAX6418UK23+T itself is not automotive-qualified, but the MAX6418UK23/V+T variant is AEC-Q100 qualified. Both share identical electrical specifications and SOT23-5 packaging; the /V suffix denotes automotive qualification including extended temperature testing, failure analysis, and traceability. For automotive designs, specify the /V version.
MAX6418UK23+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V
- 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
MAX6418UK23+T FAQ
1.How can I place an order for MAX6418UK23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK23+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 MAX6418UK23+T reliable?
The price and inventory of MAX6418UK23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK23+T is usually 5 days.
3.What payment methods are accepted for MAX6418UK23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK23+T?
MAX6418UK23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK23+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 MAX6418UK23+T?
For technical support, including MAX6418UK23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK23+T requirements.
6.How does Aetrix verify that MAX6418UK23+T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK23+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 MAX6418UK23+T meets industry standards.
7.What is the process for return or replacement of MAX6418UK23+T?
All MAX6418UK23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK23+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 MAX6418UK23+T part is unused and in its original packaging.
Return procedure for MAX6418UK23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6418UK23+T Tags
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