My Inquiry
My Account
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:250
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6420UK46-T from Maxim Integrated is a low-power microprocessor supervisor IC designed for dual-voltage monitoring in automotive and industrial embedded systems. It features a factory-trimmed VCC reset threshold of 4.625V (±2.5%), an adjustable RESET IN input (1.26V reference), and an active-low open-drain RESET output. With 1.7µA typical quiescent current, capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V, it ensures reliable power-on reset for critical μP applications.
For engineers reviewing the MAX6420UK46-T datasheet, MAX6420UK46-T pinout, MAX6420UK46-T application, or MAX6420UK46-T equivalent, this device serves as a precision dual-threshold supervisor where independent monitoring of main supply (VCC) and auxiliary rail (e.g., I/O voltage) is required - especially under wide temperature (-40°C to +125°C), low-quiescent-current, and AEC-Q100-compliant design constraints.
Technical Context
The MAX6420UK46-T integrates two independent reset comparators: one laser-trimmed for VCC at 4.625V (suffix "46"), and a second high-impedance adjustable input (RESET IN) referenced to 1.26V, enabling external resistor-divider configuration for monitoring secondary voltages ≥1.26V. Its reset assertion logic triggers when either VCC falls below 4.625V or RESET IN drops below its programmed threshold.
Reset deassertion is controlled by an internal 240nA current source charging an external capacitor (CSRT) on the SRT pin; the resulting ramp time to 0.65V sets the timeout period (tRP = 2.71×10⁶ × CSRT + 275µs). The open-drain RESET output supports flexible logic-level interfacing up to 5.5V and remains valid for VCC ≥ 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2.5% over -40°C to +125°C - ensures precise brownout detection for 5V-system power rails |
| RESET IN Reference | 1.26V with 33mV hysteresis - enables accurate external voltage monitoring via resistor divider |
| Quiescent Current | 1.7µA at VCC ≤ 2.0V - supports ultra-low-power battery-backed or always-on monitoring |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - configurable delay meets diverse μP reset timing requirements |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting to host μP logic supply |
| Supply Voltage Range | 1.0V to 5.5V - guarantees valid reset assertion even during deep brownout conditions |
Pinout & Package
SOT23-5 package: compact, surface-mount, thermally robust, and AEC-Q100 qualified for automotive use.
| 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 domains |
| 2 - GND | Ground reference | Primary return path for internal comparators, current source, and output stage |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (≤10nA leakage); connects to center tap of R1/R2 divider for secondary rail monitoring |
| 4 - SRT | Set reset timeout capacitor connection | 240nA precision current source charges external CSRT; layout sensitivity demands short, clean trace |
| 5 - VCC | Main supply and fixed-threshold monitor input | Powers device and feeds laser-trimmed 4.625V comparator; valid down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (4.625V) and external rail (programmable via RESET IN) - eliminates need for two discrete supervisors |
| Capacitor-adjustable reset timeout | Full-range programmability (275µs–5.75ms) using single external capacitor - avoids fixed-delay limitations of non-adjustable parts |
| AEC-Q100 qualified | Rated for automotive Grade 0 (-40°C to +125°C) per ordering code /V variants - supports functional safety-critical reset paths |
| Ultra-low quiescent current | 1.7µA typical at 1.8V - extends battery life in portable and energy-harvesting systems without compromising supervision integrity |
| Open-drain RESET with 5.5V tolerance | Enables direct interface to 1.8V, 3.3V, or 5V μP reset inputs using appropriate pullup - no level translator required |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Management |
|---|---|
Use Scenario: Monitors both 5V main MCU supply and 3.3V I/O rail in engine control module exposed to wide thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting reset if either rail falls out of spec; timeout set to 4.375ms to exceed μP's minimum reset pulse width. Use Value: Prevents erratic MCU behavior during cold cranking or alternator ripple by independently validating two critical power domains. |
Use Scenario: Embedded controller in programmable logic controller requiring fail-safe restart after brownout on 24V-derived 5V and isolated 3.3V supplies. IC Role / Device Role / Timing Role: Provides coordinated reset signal triggered by failure of either supply; SRT capacitor selected for 3ms timeout to align with watchdog timer window. Use Value: Eliminates need for discrete comparators and RC networks, reducing BOM count and PCB area while improving thermal stability. |
| Medical Infusion Pump Controller | Smart Energy Meter Microcontroller |
Use Scenario: Battery-powered infusion pump with dual-supply architecture: primary 3.6V Li-ion rail and regulated 1.8V sensor interface rail. IC Role / Device Role / Timing Role: Supervises 3.6V main supply (via VCC pin) and 1.8V rail (via RESET IN divider); open-drain RESET pulled to 1.8V domain. Use Value: Guarantees deterministic μP reset before battery voltage drops below safe operating level - critical for dosage accuracy and safety compliance. |
Use Scenario: Revenue-grade electricity meter with isolated microcontroller powered from AC-derived 5V and 3.3V rails, subject to EMI and grid sags. IC Role / Device Role / Timing Role: Detects sag on either rail and asserts reset for >3ms; operates across full industrial temp range with <2.5% threshold drift. Use Value: Maintains data integrity and secure boot sequence during transient grid events - satisfies IEC 62053-21 reset reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK46-T | Same 4.625V VCC threshold and SOT23-5 package, but features active-low push-pull RESET (not open-drain) | Requires dedicated reset net; incompatible with shared-bus or multi-drop reset architectures | Select when driving a single μP with no level-shifting needs and board space permits pullup elimination |
| TPS3808G33DBVR | Fixed 3.3V VCC threshold only; no adjustable RESET IN; 350nA IQ; push-pull output | Single-rail monitoring only; lacks dual-threshold capability of MAX6420UK46-T | Choose only if system monitors one supply and prioritizes lowest possible quiescent current over flexibility |
Compared with MAX6418UK46-T, the MAX6420UK46-T provides open-drain flexibility for mixed-voltage systems; compared with TPS3808G33DBVR, it delivers essential dual-rail supervision at slightly higher IQ but with field-programmable timeout and broader voltage coverage.
Availability
MAX6420UK46-T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature and long product 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 - emphasizing reliability, low power, and AEC-Q100 qualification.
The MAX6412–MAX6420 family was engineered specifically for microprocessor reset supervision in harsh environments, combining dual-voltage monitoring, capacitor-adjustable timing, and ultra-low IQ in miniature SOT23 packages.
FAQ
What is the exact VCC reset threshold voltage for MAX6420UK46-T?
The MAX6420UK46-T has a factory-laser-trimmed VCC reset threshold of 4.625V, with ±1.25% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is confirmed by Maxim's Suffix Table (Table 1), where "46" corresponds to nominal 4.625V. The MAX6420UK46-T uses this fixed threshold to monitor the main supply while simultaneously supervising a second voltage via its adjustable RESET IN input.
Does MAX6420UK46-T support manual reset functionality?
No, the MAX6420UK46-T does not include a dedicated manual reset (MR) input. Unlike the MAX6412–MAX6414 series, the MAX6420UK46-T belongs to the dual-threshold variant (MAX6418/MAX6419/MAX6420) that replaces MR with RESET IN for adjustable monitoring. Manual reset can be implemented externally by shorting RESET IN to ground via a switch, leveraging the same reset assertion mechanism - but this is not a native pin function of the MAX6420UK46-T.
What is the recommended capacitor value for a 4.375ms reset timeout with MAX6420UK46-T?
For a 4.375ms reset timeout, the MAX6420UK46-T requires a 1500pF capacitor on the SRT pin, as explicitly specified in the Electrical Characteristics table (tRP = 4.375ms at CSRT = 1500pF). This value is validated across temperature and process corners. Using ceramic capacitors with ≤10nA leakage is mandatory; deviation from 1500pF will linearly shift tRP per the formula tRP = (2.71×10⁶) × CSRT + 275µs.
Can MAX6420UK46-T monitor a 2.5V rail using its RESET IN pin?
Yes, the MAX6420UK46-T can monitor a 2.5V rail via its RESET IN pin by configuring an external resistor divider. With a 1.26V internal reference, setting R2 = 1MΩ and R1 = 990kΩ yields VMON_TH = 1.26V × (1M + 990k)/1M ≈ 2.5V. The MAX6420UK46-T's high-impedance RESET IN input (≤10nA leakage) ensures minimal loading, preserving accuracy - a capability absent in single-threshold supervisors like MAX6412UK46-T.
Is MAX6420UK46-T qualified for automotive applications?
The base MAX6420UK46-T is rated for -40°C to +125°C and built on Maxim's automotive-capable BiCMOS process, but full AEC-Q100 qualification requires the /V suffix (e.g., MAX6420UK46/V+T). Per Ordering Information, /V parts undergo additional stress testing and screening. For automotive designs requiring formal qualification, specify the /V variant; the MAX6420UK46-T remains suitable for industrial and medical applications meeting the same temperature and reliability envelope.
MAX6420UK46-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:
- 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?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK46-T transactions.
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.
MAX6420UK46-T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
