My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6418UK46+T
- Part No.:
- MAX6418UK46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK46+T.pdf
- Description:
- IC RESET MPU LOW PWR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,484
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6418UK46+T from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with fixed 4.625V VCC reset threshold and adjustable RESET IN input (monitors down to 1.26V), active-low push-pull reset output, capacitor-adjustable timeout (275µs–5.75ms), and guaranteed reset validity down to VCC = 1V. It operates across –40°C to +125°C and is used in automotive power management systems to ensure reliable μP startup during multi-rail brownout conditions.
For engineers reviewing the MAX6418UK46+T datasheet, MAX6418UK46+T pinout, MAX6418UK46+T application, or MAX6418UK46+T equivalent, key selection criteria include dual-threshold monitoring capability, SOT23-5 footprint compatibility, AEC-Q100 qualification status, quiescent current ≤4.5µA at 5V, and reset timeout programmability via external capacitor.
Technical Context
The MAX6418UK46+T integrates two independent reset comparators: one laser-trimmed for VCC monitoring at 4.625V (±2.5% over temperature), and one adjustable comparator referenced to 1.26V on the RESET IN pin, enabling precise dual-rail supervision (e.g., 5V + 3.3V or 5V + 1.8V). Reset assertion occurs if either voltage falls below its threshold or manual reset is triggered.
Reset deassertion is delayed by an externally set timeout period determined by a ramp current (240nA) charging a capacitor connected to the SRT pin; the internal comparator trips when the ramp reaches 0.65V. The active-low push-pull RESET output drives logic-compatible loads up to 3.2mA sink at VCC ≥ 4.5V with VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2.5% over –40°C to +125°C - ensures accurate 5V rail supervision under automotive thermal stress |
| RESET IN Threshold | 1.26V ±33mV hysteresis - enables stable adjustable monitoring of secondary rails (e.g., 3.3V via R-divider) |
| Supply Current | 4.5µA max at VCC = 5V - supports ultra-low-power battery-backed systems |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - configurable delay meets diverse μP reset timing requirements |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial embedded use |
| Output Type | Active-low push-pull - eliminates need for external pull-up; drives standard CMOS inputs directly |
| Reset Validity | Guaranteed to VCC = 1V - maintains deterministic reset state during deep brownout |
Pinout & Package
SOT23-5 package (5-pin, 1.6mm × 2.9mm, 0.95mm height), 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 push-pull reset output | Drives μP reset input low during fault; sinks up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V |
| 2 - GND | Ground reference | Common return path for all internal circuits and external capacitor (SRT-to-GND) |
| 3 - RESET IN | Adjustable reset comparator input | High-impedance node (10nA leakage); accepts resistor-divider to monitor secondary voltage ≥1.26V |
| 4 - SRT | Reset timeout capacitor connection | 240nA precision current source charges external CSRT; determines tRP = (2.71×10⁶)×CSRT + 275µs |
| 5 - VCC | Supply and fixed-threshold monitor input | Powers device and feeds laser-trimmed 4.625V comparator; valid operation from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors primary VCC (4.625V) and secondary rail (via RESET IN) - eliminates need for two discrete supervisors |
| Capacitor-programmable timeout | External CSRT sets tRP from 275µs to 5.75ms - avoids fixed-delay limitations and enables design reuse |
| Low quiescent current | ≤4.5µA at 5V - extends battery life in portable and always-on automotive modules |
| AEC-Q100 qualification | Qualified per AEC-Q100 Rev H (Grade 0: –40°C to +125°C) - meets automotive reliability and stress-test requirements |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs at 100mV overdrive - prevents false resets in noisy electrical environments |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V main supply and 3.3V microcontroller core rail in engine ECU; asserts reset if either drops during cold cranking or load dump. IC Role / Device Role / Timing Role: Dual-threshold supervisor ensuring deterministic μP restart after brownout; timeout set to 4.375ms to exceed ECU boot sequence minimum. Use Value: Prevents firmware lockup during transient voltage sags; eliminates need for discrete RC timing networks or second supervisor IC. | Use Scenario: Supervises 5V system rail and 1.8V ADC reference rail in battery-powered infusion pump; guarantees safe shutdown if either rail collapses. IC Role / Device Role / Timing Role: Fault-detection interface between power domain and safety-critical controller; provides 275µs minimum reset pulse for reliable μP initialization. Use Value: Enables single-chip dual-rail monitoring with <4.5µA quiescent current - extends battery runtime without compromising safety compliance. |
| Industrial PLC I/O Module | Automotive ADAS Camera Module |
Use Scenario: Watches 24V-to-5V DC/DC output and isolated 3.3V logic rail in harsh factory environment with high EMI. IC Role / Device Role / Timing Role: Brownout detector with transient immunity; SRT capacitor selected for 3ms timeout to accommodate slow-rising industrial supplies. Use Value: Rejects short noise spikes while asserting reset on sustained undervoltage - improves system uptime in electrically noisy settings. | Use Scenario: Ensures clean startup of image sensor and ISP in rear-view camera; monitors 5V camera power and 1.2V sensor analog rail. IC Role / Device Role / Timing Role: Dual-supply sequencer and watchdog enabler; RESET output tied to ISP reset pin with push-pull drive for fast edge rates. Use Value: Active-low push-pull eliminates external pull-up resistor - reduces BOM count and PCB area in space-constrained camera housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6419UK46+T | Active-high push-pull RESET output (vs. active-low on MAX6418UK46+T) | Requires μP with active-high reset input; incompatible with legacy active-low designs without level-shifting | Select when target μP requires high-asserted reset signal and no redesign of reset net is possible |
| TPS3808G33DBVR | Fixed 3.3V VDD threshold only; no adjustable RESET IN input; 200ms min timeout (non-adjustable) | Single-rail supervision only; unsuitable for dual-voltage monitoring without adding external circuitry | Choose only for cost-sensitive single-rail applications where timeout flexibility and secondary rail monitoring are unnecessary |
Compared with MAX6419UK46+T, the MAX6418UK46+T provides native active-low reset drive, simplifying interface to most legacy microcontrollers; versus TPS3808G33DBVR, it delivers true dual-rail supervision and capacitor-adjustable timeout - critical for automotive and medical systems requiring precise, adaptable power sequencing.
Availability
MAX6418UK46+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLC I/O modules, and ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK46+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 applications in automotive, industrial, and medical markets, emphasizing reliability, low power, and integration.
The MAX6412–MAX6420 product line delivers low-power, capacitor-programmable microprocessor supervisors with dual-voltage monitoring capability - engineered specifically for robust power sequencing in automotive and safety-critical embedded systems.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK46+T?
The MAX6418UK46+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 in the Electrical Characteristics table and corresponds to the "46" suffix in the part number per Table 1 of the datasheet.
Does MAX6418UK46+T support dual-voltage monitoring, and how is the second voltage configured?
Yes, the MAX6418UK46+T supports dual-voltage monitoring: it uses its internal 4.625V comparator for VCC and an external resistor divider connected to the RESET IN pin to monitor a second voltage. The RESET IN threshold is fixed at 1.26V, so VMON_TH = 1.26V × (R1 + R2)/R2 - enabling precise supervision of rails such as 3.3V or 1.8V.
What is the function of the SRT pin on MAX6418UK46+T, and what capacitor value yields a 4.375ms reset timeout?
The SRT pin on MAX6418UK46+T connects to an external capacitor that sets the reset timeout period via a 240nA current source. Using tRP = (2.71 × 10⁶) × CSRT + 275µs, a 4.375ms timeout requires CSRT = (4.375×10⁻³ − 275×10⁻⁶) / 2.71×10⁶ = 1500pF - matching the typical value specified in the datasheet's Electrical Characteristics table.
Is MAX6418UK46+T qualified for automotive applications, and what is its temperature rating?
Yes, the MAX6418UK46+T is AEC-Q100 qualified (Grade 0) and fully specified from –40°C to +125°C. Its SOT23-5 package, BiCMOS process, and guaranteed performance across this range make it suitable for under-hood automotive modules including ECUs, body controllers, and ADAS sensors.
What output type does MAX6418UK46+T feature, and what are its drive capabilities?
The MAX6418UK46+T features an active-low push-pull RESET output. It can sink up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V, and sources negligible current when high. This eliminates the need for an external pull-up resistor and ensures fast, deterministic reset signaling to standard CMOS microcontrollers.
MAX6418UK46+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:
- Push-Pull, Totem Pole
- 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
MAX6418UK46+T FAQ
1.How can I place an order for MAX6418UK46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK46+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 MAX6418UK46+T reliable?
The price and inventory of MAX6418UK46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK46+T is usually 5 days.
3.What payment methods are accepted for MAX6418UK46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK46+T?
MAX6418UK46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK46+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 MAX6418UK46+T?
For technical support, including MAX6418UK46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK46+T requirements.
6.How does Aetrix verify that MAX6418UK46+T is sourced from the original manufacturer or authorized distributors?
All MAX6418UK46+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 MAX6418UK46+T meets industry standards.
7.What is the process for return or replacement of MAX6418UK46+T?
All MAX6418UK46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK46+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 MAX6418UK46+T part is unused and in its original packaging.
Return procedure for MAX6418UK46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6418UK46+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…
