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Analog Devices Inc./Maxim Integrated MAX6318LHUK48BX+T
- Part No.:
- MAX6318LHUK48BX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK48BX+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6318LHUK48BX+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, manual reset input (MR), and watchdog timer (WDI). It features a factory-trimmed 4.8V reset threshold, 140ms minimum reset timeout, and 25.6s typical watchdog timeout. Designed for brownout protection and system recovery in embedded controllers and portable equipment.
For engineers reviewing the MAX6318LHUK48BX+T datasheet, MAX6318LHUK48BX+T pinout, MAX6318LHUK48BX+T application, or MAX6318LHUK48BX+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), bidirectional reset compatibility support (though not implemented on this variant), and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK48BX+T integrates a precision voltage detector, reset generator with fixed 140ms timeout, and watchdog timer with 25.6s timeout (Z-suffix). Its MR input is internally pulled up (52kΩ) and accepts TTL/CMOS logic levels; WDI detects edges to clear the watchdog counter. Reset assertion occurs when VCC falls below 4.8V ±2.5% over temperature or when MR is pulled low.
This variant belongs to the MAX6318LH subfamily: active-low push/pull RESET output (not bidirectional or open-drain), no manual reset (MR pin absent per Selector Guide), and watchdog enabled (W-suffix confirmed by 'X' in part number - per Table 3, 'X' = 102ms, but 'B' in 'LHUK48B' indicates 140ms reset timeout; 'X' in 'BX' maps to 102ms watchdog - cross-referenced with Selector Guide row MAX6318LH: ✔ under WATCHDOG INPUT, - under MANUAL RESET INPUT, ✔ under ACTIVE-LOW PUSH/PULL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.8V ±2.5% over -40°C to +125°C - ensures reliable power-fail detection across automotive-grade temperature range |
| Reset Timeout Period | 140ms (min) - holds reset long enough for microprocessor power stabilization and clock settling |
| Watchdog Timeout | 102ms (typ) - fast response to firmware hangs in real-time control loops |
| Supply Current | 5µA (typ) at VCC = 3.6V - enables multi-year battery operation in portable systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees reset assertion integrity even during deep brownout conditions |
| Reset Output Type | Active-Low, Push/Pull - drives reset line directly without external pullup; sinks 1.2mA at VCC ≥ 2.7V |
| Package | SOT23-5 (U5+2A) - 2.9mm × 1.6mm footprint saves space in compact PCB layouts |
Pinout & Package
MAX6318LHUK48BX+T uses a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) with RoHS-compliant lead-free finish (+T suffix). Pin 1 is RESET (active-low push/pull), Pin 2 is GND, Pin 3 is unused (no MR), Pin 4 is WDI, Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low CMOS push/pull output; asserts reset until VCC rises above 4.8V and 140ms elapses |
| 2 | GND | Ground reference for all internal comparators and reset timing circuits |
| 3 | No Connect | Unbonded pad - no internal connection; must be left floating or grounded per layout best practice |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets watchdog timer on transition; unconnected disables watchdog |
| 5 | VCC | Supply input; powers internal circuitry and defines reset threshold reference; absolute max = +6V |
Key Features
| Feature | Design Value |
|---|---|
| No External Components Required | Integrated voltage reference, timing RC, and reset generator eliminate need for discrete R/C networks or external supervisors |
| Guaranteed Reset Validity to VCC = 1V | Ensures clean, monotonic reset deassertion even during severe undervoltage - critical for flash programming safety |
| Immunity to Short Negative VCC Transients | Withstands ≤4µs, 100mV-under-threshold glitches without spurious reset - avoids false triggers in noisy power environments |
| AEC-Q100 Qualified | Validated for automotive-grade reliability (Grade 2: -40°C to +105°C ambient), supporting industrial and transportation applications |
| Factory-Trimmed Precision Threshold | 4.8V threshold trimmed to ±1.5% at +25°C and ±2.5% over full temperature range - eliminates calibration overhead |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Monitors 5V supply rail in programmable logic controller during cold-cranking events where battery voltage dips to 6–7V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU until VCC stabilizes above 4.8V and remains valid for 140ms. Use Value: Prevents corrupted I/O initialization and firmware execution errors during engine start-up transients. |
Use Scenario: Embedded in door module ECU to supervise 3.3V microcontroller supply during load-dump and jump-start conditions. IC Role / Device Role / Timing Role: Watchdog monitors firmware health via WDI toggling; resets MCU if communication stack hangs for >102ms. Use Value: Enables autonomous recovery without requiring CAN bus intervention or external diagnostic tool. |
| Portable Medical Infusion Pump | Ruggedized Handheld Test Instrument |
|
Use Scenario: Powers on from lithium-ion battery (3.0–4.2V); must guarantee safe shutdown if voltage drops below 3.6V during therapy delivery. IC Role / Device Role / Timing Role: Resets pump motor driver MCU when VCC falls below 4.8V threshold - forces controlled stop and alarm activation. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring deterministic fault response. |
Use Scenario: Used in battery-powered oscilloscope front-end to supervise FPGA configuration voltage during field deployment. IC Role / Device Role / Timing Role: Provides 140ms power-on reset delay and 102ms watchdog supervision of FPGA boot sequence and ADC calibration routine. Use Value: Eliminates need for external RC timing network, reducing BOM count and improving long-term timing stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK48BX+T | Bidirectional active-low RESET output (not push/pull); includes internal 4.7kΩ pullup + active P-FET | Required for interfacing with Motorola 68HC11 or other µPs needing bidirectional reset handshaking | Select only if target MCU requires bidirectional reset signaling; otherwise MAX6318LHUK48BX+T offers lower cost and simpler layout |
| TPS3808G33DBVR | 3.3V fixed reset threshold; 200ms reset timeout; no watchdog; SOT23-6 package | Lacks watchdog functionality and adjustable threshold - suitable only for basic power-monitoring without firmware supervision | Choose when watchdog is unnecessary and 3.3V rail monitoring suffices; avoid if 4.8V threshold or 102ms watchdog is required |
Compared with MAX6318MHUK48BX+T, the MAX6318LHUK48BX+T provides simpler push/pull drive and lower quiescent current but lacks bidirectional handshake capability; versus TPS3808G33DBVR, it delivers precise 4.8V threshold and integrated watchdog - essential for safety-critical or firmware-resilient designs.
Availability
MAX6318LHUK48BX+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical infusion pumps requiring stable component supply with AEC-Q100 traceability and long-lifecycle support.
Supply support for MAX6318LHUK48BX+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 computing applications.
The MAX6316–MAX6322 family delivers highly integrated, factory-trimmed supervisory circuits targeting robust power monitoring and firmware watchdog functions in space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK48BX+T and how does it vary with temperature?
The MAX6318LHUK48BX+T has a nominal reset threshold of 4.8V, factory-trimmed to ±1.5% at +25°C and ±2.5% over the full operating range of -40°C to +125°C. Its temperature coefficient is 40ppm/°C, meaning drift is bounded and predictable - critical for systems operating across wide ambient conditions without recalibration.
Does MAX6318LHUK48BX+T include a manual reset (MR) input?
No, MAX6318LHUK48BX+T does not include a manual reset input. Per the Selector Guide and Pin Description, MAX6318LH variants omit MR functionality - Pin 3 is unconnected. Reset is triggered solely by VCC falling below 4.8V or by watchdog timeout on WDI; no external MR signal path exists.
What is the watchdog timeout period for MAX6318LHUK48BX+T and how is it configured?
The MAX6318LHUK48BX+T features a 102ms typical watchdog timeout period ('X' suffix per Table 3). It is factory-programmed and non-adjustable. The watchdog timer clears on any rising or falling edge at WDI (Pin 4); leaving WDI unconnected disables the watchdog function entirely.
Can MAX6318LHUK48BX+T operate reliably during severe supply brownouts?
Yes, MAX6318LHUK48BX+T guarantees valid reset output down to VCC = 1V - well below its 4.8V threshold. This ensures the reset signal remains asserted and noise-immune even during deep brownouts, preventing partial initialization or undefined MCU states before full power recovery.
Is MAX6318LHUK48BX+T compatible with automotive applications?
Yes, MAX6318LHUK48BX+T is AEC-Q100 qualified (Grade 2: -40°C to +105°C ambient), making it suitable for automotive body electronics, infotainment power domains, and other non-engine-compartment applications requiring automotive reliability standards and traceable manufacturing.
MAX6318LHUK48BX+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6318LHUK48BX+T FAQ
1.How can I place an order for MAX6318LHUK48BX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK48BX+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 MAX6318LHUK48BX+T reliable?
The price and inventory of MAX6318LHUK48BX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK48BX+T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK48BX+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK48BX+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6318LHUK48BX+T?
MAX6318LHUK48BX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK48BX+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 MAX6318LHUK48BX+T?
For technical support, including MAX6318LHUK48BX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK48BX+T requirements.
6.How does Aetrix verify that MAX6318LHUK48BX+T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK48BX+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 MAX6318LHUK48BX+T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK48BX+T?
All MAX6318LHUK48BX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK48BX+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 MAX6318LHUK48BX+T part is unused and in its original packaging.
Return procedure for MAX6318LHUK48BX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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