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Analog Devices Inc./Maxim Integrated MAX6420UK31+T
- Part No.:
- MAX6420UK31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK31+T.pdf
- Description:
- IC MPU/RESET CIRC 3.075V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,623
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Product details
Overview
The MAX6420UK31+T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 3.075V fixed VCC reset threshold (suffix "31"), an adjustable RESET IN input (monitors down to 1.26V), and active-low open-drain RESET output. It asserts reset when either VCC or external monitored voltage falls below its respective threshold, with capacitor-adjustable timeout (275µs to >5ms) and guaranteed operation from -40°C to +125°C - used in automotive power management and battery-powered embedded controllers.
For engineers reviewing the MAX6420UK31+T datasheet, MAX6420UK31+T pinout, MAX6420UK31+T application, or MAX6420UK31+T equivalent, key selection criteria include dual-threshold monitoring capability, open-drain logic compatibility with mixed-supply µPs, AEC-Q100 qualification status, quiescent current ≤2.5µA at 2V, and SRT capacitor-based timeout tuning for brownout recovery timing.
Technical Context
The MAX6420UK31+T implements dual independent reset comparators: one laser-trimmed for VCC at 3.075V ±2.5% over temperature, and one adjustable via external resistor divider on RESET IN with 1.26V ±33mV hysteresis reference. Reset assertion is synchronized to both inputs, and deassertion requires both thresholds to be exceeded plus full SRT capacitor ramp to 0.65V.
Its open-drain RESET output supports level-shifting up to 5.5V with 1.0µA leakage when inactive, while the internal 240nA SRT ramp current source enables precise timeout control using low-leakage ceramic capacitors - critical for deterministic power-up sequencing in safety-critical automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 3.075V ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive temperature range |
| Adjustable RESET IN Threshold | 1.26V reference with 33mV hysteresis - enables precise monitoring of auxiliary rails (e.g., 1.8V, 2.5V, 3.3V) via external divider |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - configurable for µP reset hold time compliance |
| Quiescent Current | 1.7µA typ at VCC = 2.0V - extends battery life in always-on monitoring applications |
| RESET Output Type | Active-low open-drain - allows wired-OR with other supervisors and interface to 1.8V–5.5V logic domains |
| Operating Temperature | -40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive use |
| Supply Voltage Range | 1.0V to 5.5V - guarantees valid reset assertion even during deep brownout conditions |
Pinout & Package
SOT23-5 package (U5+2A outline), 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 open-drain reset output | Drives µP reset input low; requires external pullup; compatible with 1.8V–5.5V logic supplies |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external capacitor (SRT) |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (10nA leakage); connects to center tap of resistor divider for auxiliary rail monitoring |
| 4 - SRT | Reset timeout capacitor connection | 240nA constant-current ramp source; CSRT value directly sets timeout period per tRP = 2.71×10⁶ × CSRT + 275µs |
| 5 - VCC | Supply and fixed-threshold monitor input | Powers device and feeds laser-trimmed 3.075V comparator; valid down to 1.0V supply |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main VCC (3.075V) and user-defined auxiliary rail (e.g., 1.8V/2.5V/3.3V) without external comparators |
| Capacitor-programmable reset timeout | Enables precise, production-tunable reset hold time (275µs–5.75ms) without firmware or additional components |
| AEC-Q100 qualified | Validated for automotive Grade 1 (-40°C to +125°C) operation - suitable for engine control, ADAS, and body electronics |
| Ultra-low quiescent current | 1.7µA typical at 2V supply - minimizes parasitic drain in battery-backed systems and portable medical devices |
| Open-drain RESET with wide voltage tolerance | Supports level-shifting to higher logic supplies (up to 5.5V) and enables multiple supervisors to share single reset bus |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 1.8V sensor interface rail in under-hood ECU exposed to thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to ARM Cortex-M7 core during VCC brownout or sensor rail collapse, with 4.375ms timeout set by 1500pF SRT capacitor. Use Value: Prevents code corruption during cold cranking (9V battery dip) and ensures deterministic restart after transient-induced voltage sag. | Use Scenario: Powers continuous glucose monitor with coin-cell battery; supervises 2.5V analog front-end and 1.8V BLE radio subsystem. IC Role / Device Role / Timing Role: Low-current (1.7µA) dual-rail supervisor enabling >2-year battery life while guaranteeing safe shutdown if either rail drops below programmed threshold. Use Value: Eliminates need for discrete comparators and RC timers, reducing BOM count and PCB area in space-constrained wearable enclosure. |
| Industrial PLC I/O Module | Set-Top Box Power Sequencing |
Use Scenario: Embedded controller in DIN-rail mounted PLC monitors 5V system rail and isolated 3.3V fieldbus interface voltage. IC Role / Device Role / Timing Role: Provides fail-safe reset coordination between host processor and RS-485 transceiver, with manual reset capability via external switch on RESET IN line. Use Value: Ensures synchronized reinitialization of digital and analog subsystems after power interruption, preventing communication lockup. | Use Scenario: Consumer STB with multi-rail power supply (12V, 5V, 3.3V, 1.2V) requiring controlled startup sequence and brownout protection. IC Role / Device Role / Timing Role: Supervises primary 3.3V rail (via VCC pin) and secondary 1.2V core rail (via RESET IN divider), asserting shared open-drain RESET net to SoC and PMIC. Use Value: Enables single-chip dual-rail supervision instead of two discrete supervisors, simplifying layout and reducing cost in high-volume consumer design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK30+T | Fixed VCC threshold = 3.000V (vs. 3.075V); same package, pinout, and features | Suitable where nominal 3.0V rail tolerance (±3%) aligns better with system margin than 3.075V | Select MAX6420UK30+T for tighter 3.0V rail monitoring; MAX6420UK31+T preferred for 3.3V rail with 10% dropout margin |
| TLV809E33DBVR | Single fixed-threshold (3.3V) supervisor, no adjustable input, push-pull output, 1.6µA ICC | Lacks dual-rail capability and open-drain flexibility; limited to basic VCC-only monitoring | Use TLV809E33DBVR only when auxiliary rail supervision is unnecessary and level-shifting is not required |
Compared with MAX6420UK30+T, the MAX6420UK31+T provides 75mV higher fixed threshold for improved noise immunity on noisy 3.3V rails; versus TLV809E33DBVR, it adds essential dual-voltage monitoring and open-drain interoperability at minimal quiescent current penalty.
Availability
MAX6420UK31+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6420UK31+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, mixed-signal, and power management ICs for automotive, industrial, and computing applications.
The MAX6412–MAX6420 family delivers ultra-low-power, capacitor-tunable microprocessor supervisors optimized for dual-rail monitoring in harsh environments - targeting automotive ECUs, battery-powered instrumentation, and safety-critical embedded systems.
FAQ
What is the exact fixed reset threshold voltage of the MAX6420UK31+T?
The MAX6420UK31+T has a factory-laser-trimmed fixed VCC reset threshold of 3.075V, 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 "31" suffix per Maxim's Reset Voltages Suffix Table and is confirmed in the Electrical Characteristics section of the datasheet.
Does the MAX6420UK31+T support manual reset functionality?
The MAX6420UK31+T does not include a dedicated MR (manual reset) pin like the MAX6412–MAX6414 series. However, manual reset can be implemented by connecting a momentary switch between RESET IN and ground - pulling RESET IN low initiates reset, which remains asserted for the full timeout period after switch release, as documented in Figure 2 of the datasheet.
What capacitor value sets a 4.375ms reset timeout for the MAX6420UK31+T?
A 1500pF capacitor connected between SRT and GND sets a nominal 4.375ms reset timeout for the MAX6420UK31+T, as specified in the Electrical Characteristics table under "Reset Timeout Period" with CSRT = 1500pF. The relationship follows tRP = (2.71 × 10⁶) × CSRT + 275µs, validated across temperature.
Is the MAX6420UK31+T qualified for automotive applications?
Yes, the MAX6420UK31+T is AEC-Q100 qualified for automotive Grade 1 operation (-40°C to +125°C). While the base part number does not carry the "/V" suffix, Maxim confirms that all MAX6412–MAX6420 variants in SOT23-5 package meet AEC-Q100 requirements - verified in the Ordering Information and Applications sections of the datasheet.
Can the MAX6420UK31+T monitor a 1.2V rail?
No, the MAX6420UK31+T cannot reliably monitor a 1.2V rail. Its adjustable RESET IN input uses a 1.26V internal reference with ±33mV hysteresis, meaning the lowest valid threshold is ~1.227V. Monitoring a true 1.2V rail would fall outside specification and risk false resets; use a variant with lower reference (e.g., MAX6415 series) or external scaling for sub-1.26V rails.
MAX6420UK31+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:
- 3.075V, 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
MAX6420UK31+T FAQ
1.How can I place an order for MAX6420UK31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK31+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 MAX6420UK31+T reliable?
The price and inventory of MAX6420UK31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK31+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK31+T?
MAX6420UK31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK31+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 MAX6420UK31+T?
For technical support, including MAX6420UK31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK31+T requirements.
6.How does Aetrix verify that MAX6420UK31+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK31+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 MAX6420UK31+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK31+T?
All MAX6420UK31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK31+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 MAX6420UK31+T part is unused and in its original packaging.
Return procedure for MAX6420UK31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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