My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6420UK29+T
- Part No.:
- MAX6420UK29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK29+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,614
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6420UK29+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with factory-trimmed 2.925V VCC reset threshold and adjustable RESET IN input (1.26V reference) for monitoring secondary supply rails. It features active-low open-drain RESET output, capacitor-adjustable reset timeout (275µs to >5ms), 1.7µA typical quiescent current, and guaranteed operation from -40°C to +125°C - used in automotive engine control units to monitor both main 3.3V logic rail and auxiliary 5V sensor supply.
For engineers reviewing the MAX6420UK29+T datasheet, MAX6420UK29+T pinout, MAX6420UK29+T application, or MAX6420UK29+T equivalent, key selection criteria include dual-threshold monitoring capability, open-drain output compatibility with mixed-voltage µP reset inputs, AEC-Q100 qualification status, and SOT23-5 footprint constraints for space-constrained automotive modules.
Technical Context
The MAX6420UK29+T integrates two independent voltage-monitoring comparators: one laser-trimmed for fixed 2.925V ±2.5% VCC detection and another with 1.26V internal reference for externally adjustable RESET IN threshold via resistor divider. Reset assertion occurs if either monitored voltage falls below its threshold or manual reset is triggered via external switch on RESET IN.
Its reset timeout is generated by a precision 240nA current source charging an external capacitor at SRT; deassertion occurs when capacitor voltage reaches 0.65V. The open-drain RESET output supports pull-up to any voltage ≤5.5V, enabling direct interface with µPs operating at different I/O voltages without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±2.5% over -40°C to +125°C - ensures reliable brownout detection on primary 3.3V rail despite temperature drift |
| RESET IN Reference | 1.26V ±33mV hysteresis - enables accurate monitoring of secondary supplies (e.g., 5V, 12V) using high-impedance resistor dividers |
| Quiescent Current | 1.7µA typical at VCC ≤ 2.0V - extends battery life in always-on automotive subsystems |
| Reset Timeout Range | 275µs (no cap) to 5.75ms (1500pF) - configurable to match µP minimum reset pulse width requirements |
| Output Type | Active-low open-drain - allows wired-OR reset bus and flexible pull-up voltage selection up to 5.5V |
| Operating Temp | -40°C to +125°C - meets under-hood automotive ambient requirements without derating |
| 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, RoHS-compliant, 1.6mm × 2.9mm footprint) with thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain reset output | Drives low during reset; requires external pull-up; compatible with 1.8V–5.5V µP reset inputs |
| 2 - GND | Ground reference | Common return path for all internal circuits and external capacitor (SRT) |
| 3 - RESET IN | Adjustable threshold input | High-impedance node for resistor-divider network; sets secondary supply trip point (VMON_TH = 1.26V × (R1+R2)/R2) |
| 4 - SRT | Reset timeout capacitor terminal | 240nA precision current source charges external CSRT; layout sensitivity requires short, noise-isolated trace |
| 5 - VCC | Main supply input | Powers device and provides reference for fixed 2.925V VCC monitor; operates down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitors | Simultaneously supervises primary VCC (2.925V) and secondary VMON_TH (user-defined) - eliminates need for two discrete supervisors in dual-rail systems |
| Capacitor-programmable timeout | External CSRT sets exact reset pulse width (275µs–5.75ms); avoids fixed-delay limitations of monolithic timers |
| AEC-Q100 qualified | Validated for automotive applications per stress test requirements - supports production deployment in engine control, ADAS, and body electronics |
| Low-leakage RESET IN | 10nA max input leakage - enables use of MΩ-range resistors in voltage dividers without threshold error |
| Glitch-immune MR function | 75ns glitch rejection on RESET IN pin - prevents spurious resets from EMI or switch bounce in manual reset implementations |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core supply and 5V image sensor bias rail in automotive power domain. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to both µP and sensor ASIC upon undervoltage on either rail. Use Value: Prevents corrupted firmware execution and sensor data corruption during cold-crank or load-dump transients. | Use Scenario: Ensures clean boot sequence for SoC and ISP in compact rear-view camera housing exposed to wide temperature swings. IC Role / Device Role / Timing Role: Provides temperature-stable reset pulse (>4ms) synchronized to both 1.8V SoC I/O and 2.8V ISP analog supply stabilization. Use Value: Eliminates boot failures caused by mismatched rail ramp rates in thermally constrained enclosures. |
| Medical Infusion Pump Controller | Industrial PLC I/O Module |
Use Scenario: Supervises battery-backed 3.3V MCU supply and isolated 24V actuator driver rail in Class II medical device. IC Role / Device Role / Timing Role: Generates fail-safe reset signal to halt motor control when either supply drops below safe operating margin. Use Value: Meets IEC 60601-1 essential performance requirements for supply fault response within 10ms. | Use Scenario: Monitors 5V fieldbus communication IC supply and 24V digital input conditioning rail in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Asserts common reset to multiple ASICs only when both rails are stable - prevents partial initialization faults. Use Value: Reduces field returns due to inconsistent startup behavior across distributed I/O channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK29+T | Active-low push-pull RESET output; no open-drain capability | Requires dedicated reset net per µP; incompatible with shared reset buses | Select when µP reset input is strictly 3.3V-tolerant and no voltage-level translation needed |
| TLV809E29DBVR | Single fixed 2.93V threshold; no adjustable RESET IN or dual-monitoring | Only monitors VCC; cannot supervise secondary rail without additional components | Select for cost-sensitive single-rail applications where secondary supply supervision is handled elsewhere |
Compared with MAX6420UK29+T, MAX6418UK29+T lacks open-drain flexibility but offers higher drive strength, while TLV809E29DBVR reduces BOM count for basic VCC-only monitoring but forfeits dual-rail capability entirely - making MAX6420UK29+T the sole choice for space-constrained dual-supply systems requiring AEC-Q100 compliance and mixed-voltage reset bus integration.
Availability
MAX6420UK29+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, medical infusion pump controllers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK29+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 product line delivers ultra-low-power, capacitor-programmable microprocessor supervisors targeting automotive and safety-critical embedded systems where dual-rail monitoring and extended temperature operation are mandatory.
FAQ
What is the exact VCC reset threshold voltage for MAX6420UK29+T?
The MAX6420UK29+T has a factory-laser-trimmed VCC reset threshold of 2.925V, 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 Table 1 of the datasheet (suffix "29") and Electrical Characteristics section, where VTH = 2.925V nominal with min/max limits of 2.852V and 2.998V respectively.
Does MAX6420UK29+T support monitoring a 5V supply using the adjustable RESET IN input?
Yes, MAX6420UK29+T supports monitoring a 5V supply via the RESET IN pin using an external resistor divider. With VRST = 1.26V reference, setting R2 = 1MΩ and R1 = 2.96MΩ yields VMON_TH = 1.26V × (1MΩ + 2.96MΩ)/1MΩ = 5.00V. The 10nA max RESET IN leakage ensures <0.3% error at these resistor values.
What capacitor value sets a 4.0ms reset timeout for MAX6420UK29+T?
Using the formula CSRT = (tRP − 275µs) / 2.71×10⁶, a 4.0ms timeout requires CSRT = (0.004 − 0.000275) / 2.71×10⁶ = 1375pF. A standard 1500pF ceramic capacitor yields 4.375ms (within datasheet's 4.15ms typical spec), meeting most µP requirements with margin.
Is MAX6420UK29+T qualified for automotive applications?
Yes, MAX6420UK29+T is AEC-Q100 qualified - explicitly stated in the Benefits and Features section and Ordering Information table. It is rated for -40°C to +125°C operation, undergoes automotive-grade stress testing, and is offered in lead-free (+T) packaging compliant with automotive manufacturing standards.
Can MAX6420UK29+T operate with VCC as low as 1.0V?
Yes, MAX6420UK29+T is fully specified from VCC = 1.0V to 5.5V. Its reset output remains valid down to VCC = 1.0V (VOL ≤ 0.4V at ISINK = 3.2mA), and internal comparators function correctly - critical for detecting brownout conditions in battery-powered systems before complete shutdown.
MAX6420UK29+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:
- 2.925V, 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
MAX6420UK29+T FAQ
1.How can I place an order for MAX6420UK29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK29+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 MAX6420UK29+T reliable?
The price and inventory of MAX6420UK29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK29+T is usually 5 days.
3.What payment methods are accepted for MAX6420UK29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK29+T?
MAX6420UK29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK29+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 MAX6420UK29+T?
For technical support, including MAX6420UK29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK29+T requirements.
6.How does Aetrix verify that MAX6420UK29+T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK29+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 MAX6420UK29+T meets industry standards.
7.What is the process for return or replacement of MAX6420UK29+T?
All MAX6420UK29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK29+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 MAX6420UK29+T part is unused and in its original packaging.
Return procedure for MAX6420UK29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6420UK29+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…
