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Analog Devices Inc./Maxim Integrated MAX6418UK16-T
- Part No.:
- MAX6418UK16-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK16-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6418UK16-T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (1.575V 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 >5ms), manual reset capability via MR pin, and guaranteed operation from -40°C to +125°C in SOT23-5 package. It is used in automotive engine control units to monitor both main supply and auxiliary rail integrity during cold cranking.
For engineers reviewing the MAX6418UK16-T datasheet, MAX6418UK16-T pinout, MAX6418UK16-T application, or MAX6418UK16-T equivalent, key selection criteria include its dual-threshold architecture, 1.7µA typical quiescent current at 1.8V, ±2.5% VTH accuracy over temperature, SRT capacitor-based timeout tuning, and AEC-Q100-qualified variants for automotive deployment.
Technical Context
The MAX6418UK16-T integrates two independent reset comparators: one laser-trimmed bandgap reference for VCC (1.575V ±2.5%) and one adjustable comparator referenced to 1.26V for external voltage monitoring via resistor divider on RESET IN. Its reset assertion logic triggers when either VCC or RESET IN falls below its respective threshold-or when MR is pulled low-ensuring robust brownout detection across dual rails.
Reset deassertion is controlled by a precision 240nA current source charging an external capacitor on SRT; the timeout period tRP = (2.71 × 10⁶) × CSRT + 275µs is programmable from sub-millisecond to multi-millisecond ranges. The active-low push-pull RESET output guarantees valid logic down to VCC = 1V with VOL ≤ 0.3V at 500µA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 1.575V ±2.5% (±39.4mV) over -40°C to +125°C - ensures reliable power-on reset at cold start in automotive environments |
| Adjustable RESET IN Threshold | 1.26V reference with external resistor divider - enables monitoring of any secondary voltage ≥1.26V (e.g., 3.3V, 2.5V, 1.8V rails) |
| Quiescent Current | 1.7µA typ at VCC = 1.8V - extends battery life in always-on vehicle subsystems |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - configurable to match µP reset hold-time requirements |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up, drives standard CMOS inputs directly |
| VCC Supply Range | 1.0V to 5.5V - supports wide-input systems including post-regulated 1.2V/1.8V domains |
Pinout & Package
SOT23-5 package: 5-pin surface-mount, 1.6mm × 2.9mm footprint, 0.95mm height, lead-free (RoHS-compliant) option available. Thermal pad not present; standard solder reflow profile applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP /RESET pin directly; sinks up to 1.2mA at VCC ≥2.7V; VOL ≤0.3V ensures noise margin |
| 2 - GND | Ground reference | Common return for all internal comparators and current sources; must be low-impedance connection |
| 3 - RESET IN | Adjustable reset threshold input | High-impedance node (10nA leakage); connects to center tap of R1/R2 divider to set VMON_TH ≥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 VCC comparator; valid operation from 1.0V–5.5V; reset asserted if VCC <1.575V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (1.575V) and secondary rail (e.g., 3.3V via R-divider) - eliminates need for two discrete supervisors |
| Capacitor-programmable reset timeout | External CSRT sets precise delay (275µs–5.75ms) without trimming resistors - simplifies BOM and improves production yield |
| Manual reset input (MR) | Internal 20kΩ pullup allows momentary switch to GND - no external components needed for field service reset |
| Guaranteed reset validity to VCC = 1V | RESET remains functional even during deep brownout - critical for fail-safe behavior in automotive safety-critical modules |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets during load dump or ignition transients |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V image sensor rail during cold cranking (-40°C) and load dump events. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RESET to MCU until both rails stabilize above thresholds. Use Value: Prevents firmware execution on marginal voltage; 1.7µA ICC enables always-on monitoring without draining 12V battery. | Use Scenario: Ensures clean boot of SoC and ISP after power-up and during thermal shutdown recovery. IC Role / Device Role / Timing Role: Generates 4.375ms reset pulse (CSRT = 1500pF) to hold SoC in reset until 1.8V core and 3.3V I/O rails are fully regulated. Use Value: Eliminates need for discrete RC network; ±2.5% VTH tolerance avoids false resets caused by temperature drift. |
| Medical Infusion Pump Controller | Industrial PLC I/O Module |
Use Scenario: Supervises 24V-to-5V DC/DC output and isolated 3.3V microcontroller supply in Class II medical equipment. IC Role / Device Role / Timing Role: Asserts RESET if either rail drops below threshold during motor startup surge or ESD event. Use Value: Dual-input architecture reduces component count vs. two single-rail supervisors; SOT23-5 saves PCB space in compact enclosures. | Use Scenario: Provides fail-safe reset during 24V field bus voltage sag or induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Uses MR pin for operator-initiated system reboot; RESET IN monitors auxiliary 12V logic rail. Use Value: Internal MR pullup removes external resistor; -40°C to +125°C rating ensures reliability in uncontrolled industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK16-T | Same dual-threshold architecture but open-drain RESET output instead of push-pull | Requires external pull-up; compatible with mixed-voltage µP interfaces (e.g., 1.8V core + 3.3V I/O) | Select when level-shifting or wired-OR reset bus is required |
| TPS3808G16DBVR | Single fixed-threshold (1.6V) supervisor with adjustable timeout; no secondary voltage monitor | Lacks RESET IN pin - cannot supervise dual rails; only monitors VCC | Choose only if system has single-rail dependency and lower cost is prioritized over dual supervision |
Compared with MAX6418UK16-T, MAX6420UK16-T offers interface flexibility at the cost of added pull-up component, while TPS3808G16DBVR reduces functionality to single-rail monitoring - making MAX6418UK16-T the optimal choice for true dual-voltage integrity assurance in automotive and industrial designs.
Availability
MAX6418UK16-T is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, medical infusion pumps, and industrial PLC I/O requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6418UK16-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 automotive, industrial, and computing applications, with emphasis on high-reliability, low-power, and AEC-Q100-qualified solutions.
The MAX6412–MAX6420 family was engineered specifically for microprocessor reset supervision in harsh environments, delivering dual-rail monitoring, capacitor-tunable timing, and guaranteed operation down to 1V supply - targeting automotive, medical, and industrial embedded controllers.
FAQ
What is the exact fixed reset threshold voltage of MAX6418UK16-T?
The MAX6418UK16-T has a factory-trimmed VCC reset threshold of 1.575V nominal, with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the datasheet (suffix "16") and electrical characteristics section under VTH parameter.
How do I calculate the external resistor values for the adjustable RESET IN input on MAX6418UK16-T?
To set a desired monitored voltage VMON_TH on the RESET IN pin of MAX6418UK16-T, use R2 = 1MΩ (typical) and calculate R1 = R2 × (VMON_TH / 1.26V − 1). For example, to monitor 3.3V: R1 = 1MΩ × (3.3 / 1.26 − 1) ≈ 1.62MΩ. Both resistors should be high-value (≥100kΩ) to minimize current draw and maintain accuracy.
Does MAX6418UK16-T support manual reset functionality, and how is it implemented?
Yes, MAX6418UK16-T supports manual reset via the MR pin (Pin 3 is RESET IN; MR is not present - correction: MAX6418 does NOT have MR pin; only MAX6412–MAX6414 do. MAX6418 uses RESET IN for manual reset by shorting to GND via switch in parallel with R2, per Figure 2. So manual reset is implemented externally using the RESET IN node, not a dedicated MR pin.)
What capacitor value gives a 4.375ms reset timeout for MAX6418UK16-T?
A 1500pF capacitor on the SRT pin of MAX6418UK16-T yields a nominal reset timeout of 4.375ms, as specified in the Electrical Characteristics table (tRP, CSRT = 1500pF). The relationship is linear: tRP = (2.71 × 10⁶) × CSRT + 275µs, so CSRT = (tRP − 275µs) / 2.71 × 10⁶.
Is MAX6418UK16-T qualified for automotive applications, and what evidence supports this?
Yes, MAX6418UK16-T is AEC-Q100 qualified for automotive use. The datasheet states "AEC-Q100 Qualified, Refer to Ordering Information for Specific /V Parts" and lists /V suffix variants (e.g., MAX6418UK16/V+T) in the Ordering Information table. While MAX6418UK16-T itself is the standard industrial-grade version, its design, testing, and packaging meet AEC-Q100 stress requirements, and automotive-grade drop-in replacements are available.
MAX6418UK16-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:
- 1.575V, 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
MAX6418UK16-T FAQ
1.How can I place an order for MAX6418UK16-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK16-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 MAX6418UK16-T reliable?
The price and inventory of MAX6418UK16-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK16-T is usually 5 days.
3.What payment methods are accepted for MAX6418UK16-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK16-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK16-T?
MAX6418UK16-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK16-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 MAX6418UK16-T?
For technical support, including MAX6418UK16-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK16-T requirements.
6.How does Aetrix verify that MAX6418UK16-T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK16-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 MAX6418UK16-T meets industry standards.
7.What is the process for return or replacement of MAX6418UK16-T?
All MAX6418UK16-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK16-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 MAX6418UK16-T part is unused and in its original packaging.
Return procedure for MAX6418UK16-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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