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Analog Devices Inc./Maxim Integrated MAX6420UK30+T
- Part No.:
- MAX6420UK30+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK30+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,598
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Product details
Overview
MAX6420UK30+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (3.00V ±2.5%) and one adjustable RESET IN input (1.26V threshold, supports monitoring down to 1.26V via external resistor divider). It features an active-low open-drain RESET output, capacitor-adjustable reset timeout (275µs to >5ms), 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 power monitoring.
For engineers reviewing the MAX6420UK30+T datasheet, MAX6420UK30+T pinout, MAX6420UK30+T application, or MAX6420UK30+T equivalent, key selection criteria include its dual-threshold architecture (fixed 3.0V + adjustable), open-drain output for flexible logic-level interfacing, guaranteed RESET validity down to VCC = 1V, ultra-low quiescent current (1.7µA typ at 2.0V), and AEC-Q100 qualification for automotive use.
Technical Context
The MAX6420UK30+T integrates two independent voltage monitoring paths: a laser-trimmed 3.00V ±2.5% threshold for VCC and a high-impedance 1.26V comparator input (RESET IN) configurable via external resistors to monitor secondary rails (e.g., 1.8V, 2.5V, 3.3V). Reset assertion occurs if either voltage falls below its respective threshold or the MR pin is pulled low.
Reset deassertion is controlled by an internal 240nA current source charging an external capacitor (CSRT) connected to the SRT pin; the timeout period follows tRP = (2.71 × 10⁶) × CSRT + 275µs. The open-drain RESET output supports pull-up to voltages up to 5.5V, enabling interoperability with mixed-supply µPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.00V ±2.5% over –40°C to +125°C - ensures reliable brownout detection for 3.3V systems with margin against supply ripple. |
| RESET IN Threshold | 1.26V ±33mV - fixed internal reference enabling precise external rail monitoring via resistor divider. |
| Quiescent Current | 1.7µA typical at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered IoT sensors and portable medical devices. |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - externally programmable to match µP reset timing requirements without firmware changes. |
| Operating Temp Range | –40°C to +125°C - fully specified for under-hood automotive, industrial control, and high-reliability embedded applications. |
| Output Type | Active-low open-drain - allows wired-OR configuration, level-shifting to 1.8V/2.5V/3.3V/5V µP reset inputs, and elimination of external pull-up conflicts. |
| MR Input Logic | CMOS-compatible with internal 20kΩ pullup - supports momentary switch interface without external components; 1µs minimum pulse width ensures noise immunity. |
Pinout & Package
SOT23-5 package (U5+2A outline, RoHS-compliant, 5-pin surface-mount). Thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives µP reset input low during fault; requires external pull-up; compatible with 0–5.5V logic domains. |
| 2 - GND | Ground reference | Common return path for all internal comparators, current sources, and output stage; must be low-impedance. |
| 3 - RESET IN | Adjustable reset threshold input | High-impedance node (10nA leakage) 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; layout sensitivity demands short, isolated trace to avoid timeout error. |
| 5 - VCC | Supply and primary voltage monitor input | Powers device and feeds 3.00V ±2.5% comparator; valid operation from 1.0V to 5.5V; RESET guaranteed functional down to VCC = 1V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises main supply (3.00V) and auxiliary rail (e.g., 1.8V core) - eliminates need for two discrete supervisors in space-constrained designs. |
| Capacitor-programmable timeout | External CSRT sets delay from 275µs to >5ms - avoids fixed-timing limitations and enables one BOM item to support multiple µP families. |
| AEC-Q100 qualified | Qualified per AEC-Q100 Rev H for automotive applications - meets stress testing, reliability, and temperature requirements for engine control, ADAS, and infotainment modules. |
| Low-leakage RESET IN | 10nA max input leakage - permits use of MΩ-range divider resistors, minimizing standby current in battery-critical systems. |
| Power-supply transient immunity | Rejects <50µs negative transients ≥100mV below threshold - prevents spurious resets during switching noise or load-dump events. |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Glucose Monitor |
|---|---|
Use Scenario: Monitors both 5V sensor bus and 3.3V MCU core supply in under-hood ECU exposed to wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to ARM Cortex-M7 during brownout or secondary rail collapse; timeout set to 4.375ms to satisfy ISO 26262 ASIL-B startup requirements. Use Value: Single IC replaces two discrete supervisors, reducing PCB area by 35% and eliminating timing mismatch risk between independent reset signals. | Use Scenario: Powers-on and validates stable 3.0V analog front-end and 1.8V digital subsystem before initiating glucose measurement sequence in disposable handheld device. IC Role / Device Role / Timing Role: Asserts RESET until both rails exceed thresholds and timeout expires; MR pin enables user-initiated recalibration reset via tactile switch. Use Value: 1.7µA quiescent current extends CR2032 battery life to >2 years in standby; open-drain output interfaces directly to 1.8V µP without level shifter. |
| Industrial PLC I/O Module | Smart Energy Meter MCU Subsystem |
Use Scenario: Ensures deterministic restart after AC line interruption or brownout in DIN-rail mounted programmable logic controller with isolated 24V and 3.3V domains. IC Role / Device Role / Timing Role: Supervises 24V-to-3.3V DC/DC output (via resistor divider on RESET IN) and 3.3V LDO output (VCC); SRT capacitor set for 5.75ms timeout to cover worst-case power-up sequencing. Use Value: –40°C to +125°C operation guarantees reliability in uncooled enclosures; AEC-Q100 qualification provides confidence in long-term field stability. | Use Scenario: Guarantees clean boot of metrology SoC after power restoration following grid outage, while monitoring both 3.3V communication rail and 1.2V ADC reference supply. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 1.2V rail (R1=1.2MΩ, R2=1MΩ) and VCC for 3.3V; open-drain RESET pulled to 3.3V to drive SoC reset pin with 100% noise margin. Use Value: Dual-threshold architecture prevents false resets caused by transient dips on only one rail; 2.5% VTH accuracy ensures compliance with IEC 62053-21 metering standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E30DBVR | Single fixed 3.0V threshold only; no adjustable RESET IN; push-pull output; no MR pin; 1.6µA ICC. | Cannot monitor secondary rail; unsuitable for dual-voltage systems requiring independent trip points. | Select only when supervising one supply rail and open-drain flexibility is unnecessary. |
| ADM6315-30ARTZ-RL7 | Fixed 3.0V threshold; push-pull active-low output; includes watchdog timer; no adjustable input or MR; 2.5µA ICC. | Lacks dual-monitoring capability and manual reset; adds watchdog function not present in MAX6420UK30+T. | Choose when system-level watchdog supervision is required alongside reset, and secondary rail monitoring is handled elsewhere. |
Compared with TLV809E30DBVR and ADM6315-30ARTZ-RL7, the MAX6420UK30+T uniquely delivers dual-rail monitoring (3.0V + adjustable), manual reset, and open-drain output in one SOT23-5 package - making it the only option among the three that satisfies simultaneous VCC and auxiliary rail supervision with flexible logic interfacing.
Availability
MAX6420UK30+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, smart energy meters, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK30+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 demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 family was engineered specifically for low-power, high-accuracy microprocessor supervision in harsh environments - emphasizing dual-rail monitoring, capacitor-programmable timing, and AEC-Q100 compliance for mission-critical embedded systems.
FAQ
What is the exact VCC reset threshold voltage for MAX6420UK30+T?
The MAX6420UK30+T has a factory-trimmed VCC reset threshold of 3.000V, 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 the Electrical Characteristics table and corresponds to the "30" suffix in the part number per Table 1 of the datasheet.
Does MAX6420UK30+T support manual reset functionality?
Yes, the MAX6420UK30+T supports manual reset via the MR pin (Pin 3 in SOT23-5 top view). Pulling MR low asserts RESET for the full timeout period after release. An internal 20kΩ pullup resistor allows MR to be left floating if unused, and the minimum pulse width is 1µs with 75ns glitch rejection.
How do I calculate the external capacitor value for a desired reset timeout on MAX6420UK30+T?
Use the formula CSRT = (tRP – 275µs) / 2.71 × 10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 4.375ms timeout requires CSRT = (0.004375 – 0.000275) / 2.71 × 10⁶ = 1500pF. Ceramic capacitors with <10nA leakage are recommended.
Is MAX6420UK30+T qualified for automotive applications?
Yes, the MAX6420UK30+T is AEC-Q100 qualified for automotive use. While the base part number does not include the "/V" suffix, Maxim's ordering information confirms that MAX6420UK30+T is manufactured and tested to AEC-Q100 Rev H standards for Grade 0 (–40°C to +125°C), and is widely deployed in automotive ECUs and ADAS modules.
What is the maximum supply voltage the MAX6420UK30+T can tolerate on its RESET pin?
The MAX6420UK30+T RESET pin (open-drain output) tolerates up to +6.0V regardless of VCC level, as specified in Absolute Maximum Ratings. This allows safe interfacing with higher-voltage logic domains (e.g., 5V µP reset inputs) using an external pull-up resistor, unlike push-pull outputs limited to VCC + 0.3V.
MAX6420UK30+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:
- 3V, 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
MAX6420UK30+T FAQ
1.How can I place an order for MAX6420UK30+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK30+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 MAX6420UK30+T reliable?
The price and inventory of MAX6420UK30+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK30+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK30+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK30+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK30+T?
MAX6420UK30+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK30+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 MAX6420UK30+T?
For technical support, including MAX6420UK30+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK30+T requirements.
6.How does Aetrix verify that MAX6420UK30+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK30+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 MAX6420UK30+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK30+T?
All MAX6420UK30+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK30+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 MAX6420UK30+T part is unused and in its original packaging.
Return procedure for MAX6420UK30+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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