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Analog Devices Inc./Maxim Integrated MAX6420UK46+T
- Part No.:
- MAX6420UK46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK46+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
MAX6420UK46+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 4.625V fixed VCC reset threshold and an adjustable RESET IN input (1.26V threshold) for monitoring secondary voltages down to 1.26V. It provides active-low open-drain RESET output with capacitor-adjustable timeout (275µs to 5.75ms), 1.7µA typical quiescent current, and guaranteed operation from -40°C to +125°C - used in automotive power management and battery-backed embedded controllers.
For engineers reviewing the MAX6420UK46+T datasheet, MAX6420UK46+T pinout, MAX6420UK46+T application, or MAX6420UK46+T equivalent, key selection criteria include dual-threshold monitoring capability, open-drain logic compatibility with mixed-supply µPs, capacitor-programmable reset timeout, and AEC-Q100-qualified variants for automotive use.
Technical Context
The MAX6420UK46+T integrates two independent voltage monitoring paths: a laser-trimmed 4.625V ±2.5% fixed threshold for VCC and a high-impedance 1.26V ±33mV adjustable threshold input (RESET IN) for external voltage dividers. Reset assertion occurs if either voltage falls below its respective threshold or manual reset is triggered via external switch across RESET IN.
Its open-drain RESET output supports logic-level translation up to 5.5V, enabling interface with µPs operating at different supply rails. The reset timeout period is set by an external capacitor on SRT pin, driven by a 240nA precision ramp current sourcing into CSRT, with deassertion occurring when capacitor voltage reaches 0.65V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 4.625V ±2.5% over -40°C to +125°C - ensures reliable brownout detection for 5V systems with tight tolerance |
| Adjustable Input Threshold | 1.26V ±33mV - enables precise dual-rail monitoring (e.g., 3.3V & 1.8V) using external resistor divider |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - programmable delay prevents premature µP release during supply stabilization |
| Quiescent Current | 1.7µA at VCC ≤ 2.0V - extends battery life in portable and always-on monitoring applications |
| Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting to 0–5.5V logic domains |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Supply 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 0–5.5V logic supplies |
| 2 - GND | Ground reference | Common return path for internal comparators and ramp circuit; must be low-impedance |
| 3 - RESET IN | Adjustable threshold input | High-impedance node (10nA leakage); connects to center tap of resistor divider for secondary voltage monitoring |
| 4 - SRT | Set reset timeout input | 240nA precision current source; connects to ground via timing capacitor (CSRT) to program tRP |
| 5 - VCC | Power supply and fixed-threshold monitor input | Supplies internal circuitry and feeds 4.625V comparator; valid reset asserted down to VCC = 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of primary rail (4.625V) and secondary rail (via RESET IN) eliminates need for two discrete supervisors |
| Capacitor-programmable timeout | External CSRT sets exact reset hold time (275µs–5.75ms), avoiding fixed-delay limitations of standard reset ICs |
| Open-drain RESET output | Enables multi-drop reset bus and logic-level translation without level shifters - critical for mixed-voltage µP systems |
| Ultra-low quiescent current | 1.7µA typ at 2V supply enables >10-year battery life in coin-cell-powered IoT sensors and backup controllers |
| AEC-Q100 qualification | Available in /V automotive-grade variants - validated for temperature cycling, ESD, and long-term reliability in vehicle ECUs |
Applications
| Automotive Body Control Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V MCU core rail in body control unit exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to ARM Cortex-M4 during brownout or secondary rail collapse. Use Value: Prevents erratic MCU behavior during cold-crank (VCC dip to 3.2V) while maintaining independent 3.3V rail integrity via RESET IN divider. |
Use Scenario: Ensures safe restart of safety-critical pump motor controller after battery swap or low-battery shutdown. IC Role / Device Role / Timing Role: Supervises 4.625V system rail and 1.8V FPGA configuration voltage; holds RESET until both stabilize post-power-up. Use Value: Guarantees deterministic state recovery before motor activation - meets IEC 62304 Class C software safety requirements. |
| Industrial PLC I/O Expansion Card | Portable Test Equipment Power Sequencer |
Use Scenario: Provides fault-tolerant reset signaling in DIN-rail mounted I/O module with isolated 24V-to-5V/3.3V conversion. IC Role / Device Role / Timing Role: Uses open-drain RESET to drive optocoupled reset line shared across multiple isolated µP domains. Use Value: Enables single-point reset coordination across galvanically separated sections without level-shifter components. |
Use Scenario: Manages power sequencing for multi-rail benchtop instrument (±15V analog, 5V digital, 3.3V logic) powered from Li-ion battery. IC Role / Device Role / Timing Role: Monitors battery voltage (via RESET IN divider) and 5V LDO output (VCC) to initiate graceful shutdown before cutoff. Use Value: Extends usable battery capacity by triggering controlled shutdown at 3.4V battery threshold instead of waiting for undervoltage lockout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V threshold only; no adjustable input; push-pull output; 1.6µA IQ | Single-rail monitoring only; requires external circuitry for dual-voltage detection | Select when only primary rail supervision is needed and PCB space permits added resistors/dividers |
| ADM6315-46ARTZ-R7 | Fixed 4.63V threshold; no adjustable input; open-drain output; 2.5µA IQ; -40°C to +85°C | Lacks secondary rail monitoring; narrower temp range limits automotive/industrial use | Choose for cost-sensitive consumer applications where extended temperature range is not required |
Compared with TPS3808G33DBVR and ADM6315-46ARTZ-R7, the MAX6420UK46+T uniquely delivers integrated dual-threshold supervision in one SOT23-5 device, eliminating external components and enabling true independent monitoring of two rails - essential for functional safety and compact power architecture design.
Availability
MAX6420UK46+T is available at Aetrix Electronics and suitable for automotive body electronics, medical infusion pumps, and industrial PLC modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK46+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 low-power, high-reliability solutions.
The MAX6412–MAX6420 family was engineered specifically for robust microprocessor supervision in harsh environments, combining dual-voltage monitoring, capacitor-adjustable timing, and AEC-Q100 qualification for automotive electronics.
FAQ
What is the exact fixed reset threshold voltage of the MAX6420UK46+T?
The MAX6420UK46+T has a factory-laser-trimmed fixed VCC reset threshold of 4.625V, with ±2.5% accuracy over the full -40°C to +125°C operating temperature range. This value corresponds to the "46" suffix per Table 1 in the datasheet, and is confirmed in the Electrical Characteristics table under VTH parameter.
Does the MAX6420UK46+T support manual reset functionality?
The MAX6420UK46+T does not include a dedicated MR (manual reset) pin like the MAX6412–MAX6414 series. Instead, manual reset is implemented by connecting a momentary switch between RESET IN and ground - pulling RESET IN low triggers reset assertion, and the timeout period begins upon switch release, as described in Figure 2 of the datasheet.
Can the MAX6420UK46+T monitor a 3.3V rail as the secondary voltage?
Yes - the MAX6420UK46+T's RESET IN pin accepts an externally divided voltage. To monitor a 3.3V rail, use a resistor divider (e.g., R1 = 1.65MΩ, R2 = 1MΩ) to scale 3.3V down to 1.26V at RESET IN. The formula VMON_TH = 1.26 × (R1 + R2)/R2 ensures accurate threshold setting per the datasheet's Reset Threshold section.
What is the minimum capacitor value required for the SRT pin on the MAX6420UK46+T?
The SRT pin requires a low-leakage capacitor (≤10nA), typically ceramic. While no absolute minimum is specified, CSRT = 0F yields a 275µs timeout. For practical designs, ≥100pF is recommended to ensure stable ramping and noise immunity; values below 50pF may cause timing inaccuracy due to stray capacitance effects.
Is the MAX6420UK46+T qualified for automotive applications?
The base MAX6420UK46+T is rated for -40°C to +125°C operation and meets industrial reliability standards. Automotive-grade qualification (AEC-Q100) is available in /V variants such as MAX6420UK46/V+T - explicitly listed in the Ordering Information table and marked with "/V" suffix, indicating full stress testing for automotive environments.
MAX6420UK46+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:
- 4.625V, 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
MAX6420UK46+T FAQ
1.How can I place an order for MAX6420UK46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK46+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 MAX6420UK46+T reliable?
The price and inventory of MAX6420UK46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK46+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK46+T?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK46+T?
MAX6420UK46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK46+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 MAX6420UK46+T?
For technical support, including MAX6420UK46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK46+T requirements.
6.How does Aetrix verify that MAX6420UK46+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK46+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 MAX6420UK46+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK46+T?
All MAX6420UK46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK46+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 MAX6420UK46+T part is unused and in its original packaging.
Return procedure for MAX6420UK46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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