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Analog Devices Inc./Maxim Integrated MAX6418UK29+T
- Part No.:
- MAX6418UK29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK29+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
MAX6418UK29+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (2.925V, ±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 in automotive-grade SOT23-5 packaging. It is used in battery-powered controllers and embedded systems requiring reliable dual-rail brownout detection.
For engineers reviewing the MAX6418UK29+T datasheet, MAX6418UK29+T pinout, MAX6418UK29+T application, or MAX6418UK29+T equivalent, key selection criteria include its dual-threshold architecture (fixed + adjustable), guaranteed RESET validity down to VCC = 1V, 1.7µA typical quiescent current, AEC-Q100 qualification eligibility, and SRT-capacitor–programmable timeout timing.
Technical Context
The MAX6418UK29+T integrates two independent reset comparators: one laser-trimmed bandgap reference comparator for VCC (nominal 2.925V, ±2.5% over temperature), and one high-impedance adjustable comparator on RESET IN (1.26V internal reference) enabling external resistor-divider–based monitoring of voltages ≥1.26V. Reset assertion occurs if either voltage falls below its threshold or MR is pulled low.
Reset deassertion is delayed by a precision 240nA current source charging an external capacitor (CSRT) connected to SRT; the resulting ramp-to-0.65V determines timeout (tRP = 2.71×10⁶ × CSRT + 275µs). The active-low push-pull RESET output drives logic-compatible loads up to 3.2mA sink at VCC ≥ 4.5V while maintaining VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±2.5% over –40°C to +125°C - ensures accurate brownout detection for 3.0V nominal rails with guaranteed hysteresis |
| RESET IN Threshold | 1.26V ±33mV - enables precise external voltage monitoring (e.g., 1.8V, 2.5V, 5V rails) using high-value resistor dividers |
| Quiescent Current | 1.7µA (typ) at VCC ≤ 2.0V - supports multi-year battery life in portable and remote sensor applications |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - provides flexible reset hold time for diverse µP power-up sequences |
| Operating Temperature | –40°C to +125°C - meets extended industrial and automotive under-hood requirements |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup, delivers rail-to-rail logic levels compatible with CMOS inputs |
| MR Input Logic | CMOS-compatible with internal 20kΩ pullup - allows momentary switch interface without external components |
Pinout & Package
SOT23-5 package (U5+2A outline, RoHS-compliant, 5-pin surface-mount); 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 up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V; valid for VCC ≥ 1V |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external capacitor (SRT-to-GND) |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (10nA leakage); connects to center tap of resistor divider to set secondary rail threshold ≥1.26V |
| 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 primary reset comparator; monitors own supply from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset monitoring | Simultaneously supervises VCC (2.925V) and external rail (via RESET IN), eliminating need for two discrete supervisors |
| Capacitor-programmable timeout | Enables precise, application-specific reset hold time (275µs–5.75ms) without trimming resistors or firmware changes |
| Guaranteed operation down to VCC = 1V | Ensures valid RESET assertion during deep brownout conditions where many µPs remain functional but unstable |
| AEC-Q100 qualification path | Available in /V automotive-grade variants; this part uses same die and SOT23-5 package as qualified versions |
| Low transient susceptibility | Rejects VCC glitches ≤50µs when 100mV below threshold - improves robustness in noisy automotive/industrial environments |
Applications
| Automotive Body Control Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 3.3V MCU supply and 5V motor driver rail in a CAN-connected body control unit exposed to load-dump transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET if either rail drops below specification, with 4.375ms timeout (CSRT = 1500pF) ensuring full MCU initialization. Use Value: Prevents erratic MCU behavior during cold-crank or alternator ripple events; eliminates need for separate reset ICs per rail. |
Use Scenario: Ensures safe restart after battery swap or low-battery warning in a Class II medical device with isolated 1.8V logic and 2.5V analog sensor supplies. IC Role / Device Role / Timing Role: Uses VCC pin for 2.925V main supply supervision and RESET IN (with R1/R2 divider) to monitor 2.5V analog rail at 2.475V threshold. Use Value: Guarantees deterministic state recovery before drug delivery resumes; 1.7µA ICC extends disposable battery life beyond 24 months. |
| Industrial PLC I/O Module | Portable Test Equipment |
Use Scenario: Supervises 5V fieldbus interface and 3.3V FPGA core in a DIN-rail mounted controller operating at 85°C ambient. IC Role / Device Role / Timing Role: Leverages –40°C to +125°C rating and dual thresholds to maintain watchdog integrity despite thermal derating of DC/DC converters. Use Value: Avoids spurious resets caused by temperature-induced voltage drift; push-pull RESET drives FPGA's asynchronous reset without external level-shifting. |
Use Scenario: Provides fail-safe reset for a handheld multimeter powered by two AA cells (1.8V–3.2V range) with LCD and ADC subsystems. IC Role / Device Role / Timing Role: Configured with CSRT = 1000pF for 3.0ms timeout; VCC monitored at 2.925V, RESET IN used to detect 1.8V brownout via 1MΩ/1.2MΩ divider. Use Value: Enables single-supply supervision with sub-2µA total system current; SOT23-5 footprint minimizes PCB area in space-constrained enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6419UK29+T | Active-high push-pull RESET output instead of active-low | Requires inverted reset logic on µP side; incompatible with systems expecting active-low assertion | Select when host µP reset pin is active-high and no inverter is available |
| TPS3808G33DBVR | Fixed 3.3V VDD threshold only; no adjustable RESET IN input; 300ms min timeout (non-adjustable) | Cannot monitor secondary rails; unsuitable for dual-voltage systems requiring custom thresholds | Choose only for single-rail 3.3V applications where timing flexibility and secondary monitoring are unnecessary |
Compared with MAX6418UK29+T, MAX6419UK29+T offers identical dual-threshold functionality but requires active-high reset compatibility, while TPS3808G33DBVR lacks adjustable monitoring and programmable timeout-making it inadequate for true dual-rail supervision.
Availability
MAX6418UK29+T is available at Aetrix Electronics and suitable for automotive body control modules, medical infusion pump controllers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK29+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 reliability, low power, and high integration.
The MAX6412–MAX6420 family was developed specifically for microprocessor reset supervision in space- and power-constrained systems requiring dual-rail monitoring, capacitor-adjustable timing, and extended temperature operation.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK29+T?
The MAX6418UK29+T has a factory-laser-trimmed VCC reset threshold of 2.925V, with tolerance of ±1.25% at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value corresponds to the "29" suffix in the part number per Table 1 of the datasheet, and is verified in the Electrical Characteristics table under VTH.
Does MAX6418UK29+T support monitoring a 1.8V supply rail?
Yes. The MAX6418UK29+T uses its adjustable RESET IN input (1.26V internal reference) to monitor secondary rails. For a 1.8V rail, a resistor divider (e.g., R1 = 428kΩ, R2 = 1MΩ) sets VMON_TH = 1.26V × (R1 + R2)/R2 ≈ 1.8V. The design is validated in Figure 4 and the Reset Threshold section of the datasheet.
What is the minimum and maximum reset timeout period achievable with MAX6418UK29+T?
The MAX6418UK29+T reset timeout (tRP) ranges from 275µs (SRT unconnected) to 5.75ms (CSRT = 1500pF), calculated using tRP = (2.71 × 10⁶) × CSRT + 275µs. The datasheet specifies these limits in the Electrical Characteristics table under "Reset Timeout Period" with test conditions.
Is MAX6418UK29+T qualified for automotive applications?
The MAX6418UK29+T shares the same die and SOT23-5 package as AEC-Q100 qualified variants (e.g., MAX6418UK29/V+T). While MAX6418UK29+T itself is not marked /V, its specifications - including –40°C to +125°C operation, transient immunity, and package construction - align with automotive requirements per the Ordering Information and Selector Guide.
Can MAX6418UK29+T operate with VCC below 1.0V?
No. The MAX6418UK29+T guarantees valid RESET output only for VCC ≥ 1.0V, as stated in Absolute Maximum Ratings and Detailed Description. Below 1V, RESET output current sinking capability collapses, risking indeterminate logic states. For VCC = 0V operation, external pulldown (100kΩ) is required per Figure 6 - but the IC itself is not functional below 1V.
MAX6418UK29+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:
- 2.925V, 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
MAX6418UK29+T FAQ
1.How can I place an order for MAX6418UK29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK29+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 MAX6418UK29+T reliable?
The price and inventory of MAX6418UK29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK29+T is usually 5 days.
3.What payment methods are accepted for MAX6418UK29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK29+T?
MAX6418UK29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK29+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 MAX6418UK29+T?
For technical support, including MAX6418UK29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK29+T requirements.
6.How does Aetrix verify that MAX6418UK29+T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK29+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 MAX6418UK29+T meets industry standards.
7.What is the process for return or replacement of MAX6418UK29+T?
All MAX6418UK29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK29+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 MAX6418UK29+T part is unused and in its original packaging.
Return procedure for MAX6418UK29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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