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Analog Devices Inc./Maxim Integrated MAX6420UK26+T
- Part No.:
- MAX6420UK26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK26+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:246
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Product details
Overview
MAX6420UK26+T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 2.625V fixed VCC reset threshold (±2.5% over temperature), an adjustable RESET IN input (1.26V reference), and active-low open-drain RESET output. It asserts reset when either VCC or externally monitored voltage falls below its threshold, with capacitor-adjustable timeout (275µs to >5ms) and guaranteed operation down to VCC = 1V. It is used in automotive power management and battery-powered embedded controllers for reliable brownout detection.
For engineers reviewing the MAX6420UK26+T datasheet, MAX6420UK26+T pinout, MAX6420UK26+T application, or MAX6420UK26+T equivalent, key selection considerations include its dual-threshold architecture, open-drain logic compatibility with multiple supply rails, AEC-Q100 qualification (per /V variants), SRT capacitor-based timeout tuning, and guaranteed reset validity at VCC ≥ 1V - critical for automotive and medical power sequencing.
Technical Context
The MAX6420UK26+T integrates two independent reset comparators: one monitors VCC against a laser-trimmed 2.625V threshold (±2.5% over −40°C to +125°C), while the second monitors an external voltage via RESET IN using a 1.26V internal reference and external resistor divider. Reset assertion is triggered by either comparator or manual reset (via MR pin on related variants, though MAX6420 lacks MR).
Its open-drain RESET output supports logic-level translation across supplies up to 5.5V, and the SRT pin implements a precision 240nA current source charging an external capacitor to generate the programmable timeout delay. The device operates from 1.0V to 5.5V supply and draws only 1.7µA typical quiescent current at VCC ≤ 2.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 2.625V ±2.5% over −40°C to +125°C - ensures accurate brownout detection for 2.8V/3.3V systems |
| Adjustable RESET IN Reference | 1.26V ±33mV hysteresis - enables monitoring of secondary rails (e.g., 1.8V, 2.5V) via external resistor divider |
| Reset Timeout Range | 275µs to >5.75ms (CSRT = 0F to 1500pF) - configurable power-up hold time for diverse µP reset requirements |
| Supply Current | 1.7µA typ at VCC ≤ 2.0V - ultra-low power ideal for battery-backed or always-on monitoring |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and interface to 0–5.5V logic domains without level shifters |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial environments |
| VCC Validity Limit | Guaranteed RESET functionality down to VCC = 1.0V - prevents spurious release during deep brownout |
Pinout & Package
SOT23-5 package (package code U5+2A), 5-pin surface-mount, RoHS-compliant lead-free (+T suffix), footprint per land pattern 90-0174.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives µP reset input low; requires external pullup; compatible with 0–5.5V host logic |
| 2 - GND | Ground reference | Return path for all internal circuitry and external capacitor (SRT) |
| 3 - RESET IN | Adjustable reset threshold input | High-impedance node for external resistor divider; sets secondary rail trip point using 1.26V internal reference |
| 4 - SRT | Set reset timeout input | 240nA precision current source charges external capacitor to define reset hold duration |
| 5 - VCC | Supply voltage and primary monitor input | Powers device and feeds fixed-threshold comparator; valid from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises primary VCC (2.625V) and secondary rail (via RESET IN) - eliminates need for two discrete supervisors |
| Capacitor-programmable timeout | External SRT capacitor sets precise reset hold time (275µs–5.75ms) - avoids fixed-delay limitations and enables design reuse |
| Open-drain RESET output | Supports multi-supply logic interfacing and wired-OR reset buses - simplifies system-level reset coordination |
| Low quiescent current | 1.7µA typical at VCC ≤ 2.0V - extends battery life in portable and energy-sensitive applications |
| Wide temperature range | Specified from −40°C to +125°C - meets automotive AEC-Q100 requirements for harsh-environment deployment |
Applications
| Automotive Body Control Module | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 2.8V microcontroller supply and 1.8V sensor interface rail in a vehicle door module subject to load-dump transients and cold-crank conditions. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to MCU and peripheral ASICs during brownout or overvoltage events. Use Value: Prevents erratic MCU behavior during battery voltage sag; capacitor-tuned timeout ensures sufficient hold time for full firmware initialization after recovery. |
Use Scenario: Powers on/off sequence control in a handheld ECG device with separate 3.3V processor and 2.5V analog front-end rails. IC Role / Device Role / Timing Role: Simultaneous VCC (2.625V) and RESET IN (2.5V rail via divider) supervision with single open-drain RESET signal. Use Value: Guarantees coordinated reset of digital and analog subsystems; 1.7µA quiescent current minimizes standby drain on lithium coin cell. |
| Industrial PLC I/O Module | Battery-Powered Data Logger |
Use Scenario: Supervises 5V fieldbus controller and 3.3V FPGA configuration rail in a DIN-rail mounted automation module operating in uncontrolled ambient temperatures. IC Role / Device Role / Timing Role: High-temperature-stable dual-voltage monitor with open-drain output tied to shared system reset bus. Use Value: −40°C to +125°C operation ensures reliability in cabinet-mounted enclosures; open-drain output enables fault-isolated reset arbitration. |
Use Scenario: Long-term environmental sensor node powered by AA batteries, requiring ultra-low-power supervision of 1.8V MCU and 3.0V ADC supply. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 3.0V rail (via R-divider) while VCC (1.8V) powers the supervisor itself. Use Value: Enables true dual-rail monitoring from single 1.8V supply; sub-2µA ICC preserves multi-year battery life in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK26+T | Same 2.625V fixed VCC threshold and RESET IN, but features active-low push-pull RESET output instead of open-drain | Requires dedicated reset net; cannot share pullup or interface to higher-voltage logic without level shifter | Select when system uses single-supply µP with CMOS-compatible reset input and no wired-OR requirement |
| TPS3808G33DBVR | Fixed 3.3V threshold only; no adjustable RESET IN; push-pull output; 1.8µA ICC; same SOT23-5 package | Single-rail monitoring only; lacks dual-voltage capability of MAX6420UK26+T | Select when only VCC supervision is needed and 3.3V threshold matches system rail |
Compared with MAX6418UK26+T, MAX6420UK26+T provides logic-level flexibility via open-drain output but requires an external pullup; compared with TPS3808G33DBVR, it adds critical dual-rail monitoring at the cost of slightly higher design complexity for the adjustable input network.
Availability
MAX6420UK26+T is available at Aetrix Electronics and suitable for automotive body electronics, portable medical instrumentation, and industrial data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK26+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, with emphasis on power efficiency and reliability.
The MAX6412–MAX6420 family delivers configurable µP supervision with dual-voltage monitoring and capacitor-adjustable timing, targeting safety-critical embedded systems where deterministic reset behavior and wide-temperature operation are mandatory.
FAQ
What is the exact fixed reset threshold voltage of the MAX6420UK26+T?
The MAX6420UK26+T has a factory-laser-trimmed fixed VCC reset threshold of 2.625V, 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 "26" suffix in the part number per Table 1 of the datasheet, and applies specifically to the VCC monitoring channel.
Does the MAX6420UK26+T include a manual reset (MR) input?
No, the MAX6420UK26+T does not include a manual reset input. Unlike the MAX6412–MAX6414 series, the MAX6420 belongs to the dual-threshold subgroup (with fixed + adjustable inputs) and omits the MR pin. Its reset is triggered solely by VCC falling below 2.625V, RESET IN falling below its programmed threshold, or power cycling.
How is the reset timeout period set on the MAX6420UK26+T?
The reset timeout period on the MAX6420UK26+T is set by connecting an external capacitor (CSRT) between the SRT pin and ground. The device uses a precision 240nA current source to charge CSRT; timeout tRP = (2.71 × 10⁶) × CSRT + 275µs. For example, a 1500pF capacitor yields 4.375ms typical timeout.
Can the MAX6420UK26+T monitor a 3.3V rail as the secondary voltage?
Yes, the MAX6420UK26+T can monitor a 3.3V rail using its RESET IN pin. By connecting a resistor divider (e.g., R1 = 1.65MΩ, R2 = 1MΩ) between the 3.3V rail and ground, the voltage at RESET IN becomes 1.26V when the rail is at 3.3V - matching the internal 1.26V reference and triggering reset if the rail drops below that point.
Is the MAX6420UK26+T qualified for automotive applications?
The base MAX6420UK26+T is not explicitly AEC-Q100 qualified; however, Maxim offers /V-suffixed automotive-grade variants (e.g., MAX6420UK26/V+T) that meet AEC-Q100 Grade 0 (−40°C to +150°C junction) requirements. Customers requiring automotive qualification must select the /V version - the +T suffix alone indicates RoHS-compliant packaging, not automotive qualification.
MAX6420UK26+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:
- 2.625V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6420UK26+T FAQ
1.How can I place an order for MAX6420UK26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK26+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 MAX6420UK26+T reliable?
The price and inventory of MAX6420UK26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK26+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK26+T?
MAX6420UK26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK26+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 MAX6420UK26+T?
For technical support, including MAX6420UK26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK26+T requirements.
6.How does Aetrix verify that MAX6420UK26+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK26+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 MAX6420UK26+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK26+T?
All MAX6420UK26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK26+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 MAX6420UK26+T part is unused and in its original packaging.
Return procedure for MAX6420UK26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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