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Analog Devices Inc./Maxim Integrated MAX6418UK33+T
- Part No.:
- MAX6418UK33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK33+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,843
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Product details
Overview
MAX6418UK33+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (3.300V ±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 - used in automotive engine control units for reliable brownout detection during cold-crank conditions.
For engineers reviewing the MAX6418UK33+T datasheet, MAX6418UK33+T pinout, MAX6418UK33+T application, or MAX6418UK33+T equivalent, key selection criteria include dual-rail monitoring capability, guaranteed RESET validity down to VCC = 1V, AEC-Q100 qualification (indicated by /V suffix variants), SOT23-5 footprint compatibility, and quiescent current of ≤2.5µA at VCC ≤ 2.0V.
Technical Context
The MAX6418UK33+T implements dual-threshold supervision: a laser-trimmed internal comparator monitors VCC against a fixed 3.300V threshold (±2.5% over temperature), while a high-impedance RESET IN pin accepts externally divided voltages referenced to a precise 1.26V internal reference. Reset assertion occurs if either voltage falls below its respective threshold or MR is pulled low.
Reset deassertion is delayed by an external capacitor (CSRT) connected to the SRT pin, where a 240nA current source charges the capacitor to 0.65V - enabling programmable timeout from 275µs (no capacitor) to 5.75ms (1500pF). The active-low push-pull RESET output sinks up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 3.300V ±2.5% over -40°C to +125°C - ensures accurate power-rail monitoring without external components |
| Adjustable RESET IN Threshold | 1.26V ±33mV hysteresis - enables precise monitoring of secondary supplies (e.g., 1.8V, 2.5V) via resistor divider |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - configurable delay prevents premature μP release during slow-rising supplies |
| Supply Current | 1.7µA (typ) at VCC ≤ 2.0V - extends battery life in portable and automotive always-on modules |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive applications and industrial embedded controllers |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up resistor and supports direct interface to CMOS μP reset inputs |
| VCC Validity Limit | RESET guaranteed valid down to VCC = 1.0V - ensures deterministic reset behavior during deep brownout events |
Pinout & Package
SOT23-5 package (U5+2A outline, 90-0174 land pattern), 5-pin surface-mount, RoHS-compliant lead-free (+T 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 μP reset input directly; sinks 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V |
| 2 - GND | Ground reference | Common return path for all internal comparators and current sources; must be low-impedance |
| 3 - RESET IN | Adjustable reset threshold input | High-impedance node (10nA leakage) for external resistor-divider; sets secondary rail threshold using 1.26V reference |
| 4 - SRT | Set reset timeout input | 240nA precision current source pin; connects to ground via CSRT to program timeout period |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Monitors main system rail (1.0V–5.5V); reset asserted if VCC < 3.300V ±2.5% |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors primary rail (3.300V fixed) and secondary rail (adjustable via resistor divider) - eliminates need for two discrete supervisors |
| Capacitor-programmable reset timeout | External CSRT sets delay from 275µs to 5.75ms - accommodates diverse μP power-up timing requirements without firmware changes |
| AEC-Q100 qualification support | Available in /V automotive-grade variants (e.g., MAX6418UK33/V+T) - meets stress testing and reliability requirements for automotive ECUs |
| Ultra-low quiescent current | 1.7µA typical at VCC ≤ 2.0V - enables use in battery-backed systems with multi-year shelf life |
| Manual reset input (MR) | Internal 20kΩ pullup allows momentary switch to ground; reset persists for full timeout after release - simplifies field service and diagnostics |
Applications
| Engine Control Unit (ECU) | Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 5V main logic rail and 3.3V MCU core supply during cold-crank (battery dips to 6V) and load-dump transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET until both rails stabilize above 3.300V and 1.26V×(R1+R2)/R2 thresholds. Use Value: Prevents ECU firmware corruption by enforcing minimum reset timeout of 3ms during unstable supply recovery. |
Use Scenario: Ensures safe shutdown when 3.3V analog sensor rail drops below 3.2V or 1.8V digital rail falls below 1.75V due to battery depletion. IC Role / Device Role / Timing Role: Resets safety-critical ARM Cortex-M4 MCU only when both monitored rails exceed their thresholds for ≥4.375ms. Use Value: Eliminates false resets from transient noise while guaranteeing fail-safe response to actual undervoltage faults. |
| Industrial PLC I/O Module | Automotive ADAS Camera ECU |
Use Scenario: Supervises isolated 24V-to-5V DC/DC output and 3.3V FPGA configuration rail in harsh factory environments. IC Role / Device Role / Timing Role: Asserts active-low RESET to FPGA and microcontroller upon either rail collapse, with timeout set to 5ms to accommodate slow-start converters. Use Value: Enables deterministic reconfiguration after power interruption without requiring external watchdog or software intervention. |
Use Scenario: Monitors 12V camera power domain and 1.1V image sensor core rail in parking camera module exposed to -40°C to +105°C ambient. IC Role / Device Role / Timing Role: Dual-supply reset generator with guaranteed operation at 125°C junction temperature and RESET validity down to VCC = 1V. Use Value: Meets ASIL-B functional safety requirements by preventing partial initialization during thermal stress-induced voltage droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6419UK33+T | Active-high push-pull RESET output instead of active-low | Requires μP with active-high reset input; incompatible with standard active-low reset designs | Select only if target microcontroller requires high-true reset assertion |
| TPS3808G33DBVR | Fixed 3.3V threshold only; no adjustable RESET IN input; uses internal timer (not capacitor-programmable) | Lacks dual-rail monitoring capability; reset timeout fixed at 200ms or selectable via pin strap | Choose when single-rail supervision suffices and programmable timeout is not required |
Compared with MAX6418UK33+T, MAX6419UK33+T provides identical dual-voltage monitoring but inverted logic polarity, while TPS3808G33DBVR offers lower cost and smaller footprint but sacrifices adjustable secondary-rail monitoring and flexible timeout configuration - making MAX6418UK33+T optimal for complex multi-rail systems requiring design flexibility.
Availability
MAX6418UK33+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLC I/O modules, and ADAS camera ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK33+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 - emphasizing low power, high reliability, and AEC-Q100 qualification.
The MAX6412–MAX6420 family delivers configurable microprocessor supervision for systems requiring dual-rail monitoring, capacitor-tunable reset delays, and operation across -40°C to +125°C - targeting automotive ECUs, battery-powered instrumentation, and safety-critical embedded controllers.
FAQ
What is the exact fixed reset threshold voltage for MAX6418UK33+T?
The MAX6418UK33+T has a factory-laser-trimmed VCC reset threshold of 3.300V, with tolerance of ±1.25% at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold Accuracy" and corresponds to the "33" suffix in the part number per Table 1 of the datasheet.
Does MAX6418UK33+T support monitoring a 1.8V supply rail?
Yes, MAX6418UK33+T supports monitoring a 1.8V rail using its adjustable RESET IN input. By connecting a resistor divider (e.g., R1 = 500kΩ, R2 = 1MΩ) between VCC and ground, with the midpoint fed to RESET IN, the device triggers reset when the 1.8V rail falls below 1.26V × (R1 + R2)/R2 = 1.89V - allowing precise tailoring for 1.8V systems.
What is the minimum capacitor value needed to achieve a 4ms reset timeout with MAX6418UK33+T?
To achieve a 4ms reset timeout with MAX6418UK33+T, use CSRT = (tRP − 275µs) / 2.71×10⁶ = (0.004 − 0.000275) / 2.71×10⁶ ≈ 1375pF. A standard 1500pF ceramic capacitor yields 4.375ms (within datasheet's typ value), meeting most μP requirements. Ensure capacitor leakage <10nA and place close to SRT pin per layout guidelines.
Is MAX6418UK33+T qualified for automotive applications?
The base MAX6418UK33+T is not explicitly AEC-Q100 qualified; however, Maxim offers automotive-grade variants such as MAX6418UK33/V+T (with /V suffix) that meet AEC-Q100 Grade 0 (−40°C to +150°C) requirements. These /V parts undergo additional stress testing and are intended for under-hood automotive use - confirm ordering code suffix before automotive deployment.
Can MAX6418UK33+T operate with VCC as low as 1.0V?
Yes, MAX6418UK33+T is fully specified to operate with VCC as low as 1.0V. Its RESET output remains guaranteed valid (logic-low state with VOL ≤ 0.3V at ISINK = 50µA) down to VCC = 1.0V, enabling robust brownout detection in ultra-low-voltage systems - a key differentiator versus many competitors that require ≥1.6V minimum supply.
MAX6418UK33+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:
- 3.3V
- 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
MAX6418UK33+T FAQ
1.How can I place an order for MAX6418UK33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK33+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 MAX6418UK33+T reliable?
The price and inventory of MAX6418UK33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK33+T is usually 5 days.
3.What payment methods are accepted for MAX6418UK33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK33+T?
MAX6418UK33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK33+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 MAX6418UK33+T?
For technical support, including MAX6418UK33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK33+T requirements.
6.How does Aetrix verify that MAX6418UK33+T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK33+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 MAX6418UK33+T meets industry standards.
7.What is the process for return or replacement of MAX6418UK33+T?
All MAX6418UK33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK33+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 MAX6418UK33+T part is unused and in its original packaging.
Return procedure for MAX6418UK33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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