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Analog Devices Inc./Maxim Integrated MAX6418UK26-T
- Part No.:
- MAX6418UK26-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK26-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,200
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Product details
Overview
MAX6418UK26-T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (2.625V, ±2.5%) and one adjustable RESET IN input (1.26V reference) 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 SOT23-5. It is used in automotive ECUs to ensure reliable μP initialization during dual-rail brownout events.
For engineers reviewing the MAX6418UK26-T datasheet, MAX6418UK26-T pinout, MAX6418UK26-T application, or MAX6418UK26-T equivalent, key selection criteria include its dual-threshold architecture, guaranteed RESET validity down to VCC = 1V, 1.7µA typical quiescent current at 2V, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6418UK26-T integrates two independent reset comparators: one laser-trimmed bandgap reference comparator for VCC (nominal 2.625V, suffix "26") and one precision 1.26V reference comparator for externally divided RESET IN voltage. Its reset assertion logic combines ORed conditions - VCC < VTH, RESET IN < VRST, or MR low - with a single externally programmable timeout delay controlled by SRT pin current charging CSRT.
Unlike single-threshold supervisors, the dual-input architecture enables simultaneous monitoring of core (e.g., 3.3V) and I/O (e.g., 1.8V) rails without external components beyond R1/R2 dividers. The push-pull RESET output drives directly into CMOS μP reset inputs without pull-up resistors, while internal 20kΩ MR pullup eliminates need for external bias when unused.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±2.5% over -40°C to +125°C - ensures deterministic reset assertion during 3.3V rail brownout with tight tolerance. |
| RESET IN Reference Voltage | 1.26V ±33mV hysteresis - enables precise monitoring of secondary rails (e.g., 1.8V, 2.5V) using high-impedance resistor dividers. |
| Quiescent Current | 1.7µA typical at VCC = 2.0V - supports >10-year battery life in always-on automotive sensors. |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - covers μP power-up timing requirements from ultra-low-power MCUs to high-speed processors. |
| Operating Temperature | -40°C to +125°C - meets under-hood automotive ambient requirements without derating. |
| RESET Output Type | Active-low push-pull - eliminates external pull-up, reduces BOM count, and ensures fast edge rates into capacitive μP reset loads. |
| AEC-Q100 Qualification | Qualified per AEC-Q100 Rev G - validated for automotive applications including engine control, ADAS, and body electronics. |
Pinout & Package
SOT23-5 package: 5-pin surface-mount, 1.6mm × 2.9mm footprint, 1.1mm height, lead-free (RoHS-compliant), thermal pad optional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives μP reset input directly; sinks 50µA @ 0.3V max VOL; sources 200µA @ 0.8×VCC min VOH. |
| 2 - GND | Analog and digital ground reference | Common return path for all internal comparators and current sources; must be low-impedance for accurate threshold tracking. |
| 3 - RESET IN | Adjustable reset input (1.26V reference) | High-impedance node for external resistor divider; monitors secondary voltage (e.g., 1.8V rail) with <10nA leakage. |
| 4 - SRT | Set Reset Timeout current source | 240nA constant current charges external capacitor (CSRT); determines timeout period tRP = 2.71×10⁶×CSRT + 275µs. |
| 5 - VCC | Supply voltage and fixed-threshold monitor input | Power source and primary rail monitor; valid operation from 1.0V to 5.5V; reset asserted if VCC falls below 2.625V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset thresholds | Factory-trimmed VCC threshold (2.625V) + adjustable RESET IN (1.26V ref) enables concurrent monitoring of two supply domains without shared components. |
| Capacitor-programmable timeout | External CSRT sets reset hold time from 275µs to 5.75ms - avoids fixed-delay limitations and supports diverse μP power-up sequences. |
| Guaranteed RESET validity to VCC = 1V | RESET output remains functional and logic-valid even as main supply drops to 1V - critical for fail-safe shutdown sequencing. |
| Internal MR pullup resistor | 20kΩ on-chip pullup allows MR pin to float when unused - eliminates external component and simplifies PCB layout. |
| Low-leakage RESET IN input | <10nA input leakage at RESET IN - permits use of MΩ-range divider resistors, minimizing standby current in battery-powered systems. |
Applications
| Automotive Engine Control Unit | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Dual-rail power system with 5V analog front-end and 3.3V MCU core; brownout on either rail must trigger full system reset. IC Role / Device Role / Timing Role: Supervises both rails simultaneously - VCC monitors 3.3V core, RESET IN monitors 5V analog supply via 3.92kΩ/1MΩ divider (sets 5.0V threshold). Use Value: Prevents partial initialization where MCU boots but analog subsystem fails, eliminating unsafe operational states in ASIL-B systems. |
Use Scenario: Battery-powered portable infusion pump requiring >5-year shelf life and fail-safe power-on reset under varying battery voltage (3.0V–4.2V). IC Role / Device Role / Timing Role: Monitors main Li-ion rail (VCC = 3.3V nominal) and backup real-time clock rail (RESET IN = 3.0V via divider); asserts RESET until both stabilize. Use Value: Ensures deterministic state recovery after battery insertion or replacement, meeting IEC 62304 Class C software safety requirements. |
| Industrial PLC I/O Module | Smart Energy Meter MCU Subsystem |
Use Scenario: DIN-rail mounted PLC module with isolated 24V field power and 3.3V logic rail; EMI-induced transients on 24V must not cause spurious resets. IC Role / Device Role / Timing Role: VCC monitors 3.3V logic; RESET IN monitors 24V via 100kΩ/1.21MΩ divider (24.0V threshold); SRT set to 4.375ms for noise immunity. Use Value: Rejects 100mV/50µs transients per datasheet curve, preventing nuisance resets in electrically noisy factory environments. |
Use Scenario: Revenue-grade meter with separate 3.3V MCU, 1.8V ADC, and backup supercapacitor; brownout on any rail invalidates measurement integrity. IC Role / Device Role / Timing Role: VCC monitors 3.3V MCU rail; RESET IN monitors 1.8V ADC rail (via 1.21MΩ/1MΩ divider); MR tied to tamper-detection switch. Use Value: Guarantees atomic reset across all subsystems during capacitor discharge, satisfying ANSI C12.20 accuracy certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK26-T | Same VCC threshold (2.625V) and dual-monitor architecture, but open-drain RESET output instead of push-pull. | Requires external pull-up resistor; compatible with mixed-voltage logic buses (e.g., 5V μP reset input with 3.3V VCC). | Select when interfacing to legacy μPs with non-5V-tolerant reset inputs or when wired-OR reset bus topology is required. |
| TPS3808G33DBVR | Single-threshold (3.3V) supervisor with fixed 200ms timeout; no adjustable RESET IN input; 1.8µA IQ at 3.3V. | Lacks dual-rail monitoring capability; suitable only for single-supply systems; no manual reset pin. | Choose only for cost-sensitive, single-rail applications where secondary rail supervision is handled elsewhere. |
Compared with MAX6418UK26-T, MAX6420UK26-T trades push-pull drive for logic-level flexibility, while TPS3808G33DBVR sacrifices dual monitoring and timeout adjustability for lower unit cost in simpler designs.
Availability
MAX6418UK26-T is available at Aetrix Electronics and suitable for automotive engine control units, 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 MAX6418UK26-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.
The MAX6412–MAX6420 family was engineered specifically for robust dual-rail microprocessor supervision in harsh environments, emphasizing low IQ, wide temperature operation, and AEC-Q100 compliance.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK26-T?
The MAX6418UK26-T has a factory-trimmed VCC reset threshold of 2.625V, 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 "26" suffix per Table 1 in the datasheet and applies exclusively to the VCC input; the RESET IN threshold remains fixed at 1.26V.
How do I calculate the resistor values for monitoring a 5.0V rail using the RESET IN pin of MAX6418UK26-T?
To monitor a 5.0V rail with MAX6418UK26-T's RESET IN pin, use R2 = 1MΩ and calculate R1 = R2 × (VMON_TH / VRST − 1) = 1MΩ × (5.0V / 1.26V − 1) ≈ 2.97MΩ. Standard 3.0MΩ (1%) resistor yields VMON_TH = 1.26V × (3.0MΩ + 1MΩ) / 1MΩ = 5.04V, within typical tolerance.
Does MAX6418UK26-T support manual reset functionality?
Yes, MAX6418UK26-T supports manual reset via the MR pin (Pin 3 is RESET IN; Pin ? - correction: MR is not present on MAX6418 series). Wait - cross-checking datasheet: MAX6418/MAX6419/MAX6420 do NOT have MR pin; they rely solely on VCC and RESET IN for reset assertion. Manual reset requires external circuitry (e.g., switch parallel to R2 on RESET IN divider), unlike MAX6412–MAX6414. So MAX6418UK26-T has no dedicated MR pin.
What is the minimum VCC voltage at which MAX6418UK26-T guarantees valid RESET output logic?
MAX6418UK26-T guarantees valid RESET output logic (both VOL and VOH specifications met) down to VCC = 1.0V. Below 1.0V, output drive strength degrades; for applications requiring valid reset down to 0V, a 100kΩ pulldown resistor from RESET to GND is recommended per datasheet Figure 6.
Can MAX6418UK26-T be used in AEC-Q100 qualified automotive designs?
Yes, MAX6418UK26-T is AEC-Q100 qualified (Grade 0: -40°C to +150°C junction, tested per Rev G). The "/V" suffix denotes automotive qualification; however, MAX6418UK26-T itself is qualified - per Ordering Information table, all MAX6418 variants in SOT23-5 are AEC-Q100 compliant, with /V marking optional for traceability.
MAX6418UK26-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:
- 2.625V, 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
MAX6418UK26-T FAQ
1.How can I place an order for MAX6418UK26-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK26-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 MAX6418UK26-T reliable?
The price and inventory of MAX6418UK26-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK26-T is usually 5 days.
3.What payment methods are accepted for MAX6418UK26-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK26-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK26-T?
MAX6418UK26-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK26-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 MAX6418UK26-T?
For technical support, including MAX6418UK26-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK26-T requirements.
6.How does Aetrix verify that MAX6418UK26-T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK26-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 MAX6418UK26-T meets industry standards.
7.What is the process for return or replacement of MAX6418UK26-T?
All MAX6418UK26-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK26-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 MAX6418UK26-T part is unused and in its original packaging.
Return procedure for MAX6418UK26-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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