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Analog Devices Inc./Maxim Integrated MAX6318LHUK46BX+T
- Part No.:
- MAX6318LHUK46BX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6318LHUK46BX+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,396
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Product details
Overview
MAX6318LHUK46BX+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 4.63V reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout, designed for reliable power-up/brownout monitoring in embedded control systems.
For engineers reviewing the MAX6318LHUK46BX+T datasheet, MAX6318LHUK46BX+T pinout, MAX6318LHUK46BX+T application, or MAX6318LHUK46BX+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, bidirectional reset compatibility (though not applicable to this variant), and AEC-Q100 qualification for automotive-adjacent industrial use.
Technical Context
The MAX6318LHUK46BX+T implements a precision voltage monitor with laser-trimmed internal resistor divider setting VRST = 4.63V ±2.5% over -40°C to +125°C. Its reset generator asserts active-low RESET for ≥140ms after VCC rises above threshold, and its watchdog circuit triggers reset if WDI remains static beyond 1.6s (typ).
It integrates MR input with 52kΩ internal pullup and glitch rejection (100ns), supports manual reset assertion independent of VCC level, and guarantees VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.7V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA - enabling direct interface with 3.3V/5V µPs without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over -40°C to +125°C - ensures stable brownout detection for 5V systems with margin against supply ripple. |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for µP initialization before release. |
| Watchdog Timeout | 1.6s typical - provides robust software hang detection without excessive system latency. |
| Supply Current | 5µA typ at VCC = 3.6V - enables ultra-low-power operation in battery-backed or portable applications. |
| Operating Voltage Range | 1.0V to 5.5V - allows valid reset assertion even during deep brownout conditions. |
| Reset Output Type | Active-Low, Push/Pull - drives RESET low actively and high actively; no external pullup required. |
| Temperature Range | -40°C to +125°C - supports extended industrial and automotive under-hood environments. |
Pinout & Package
MAX6318LHUK46BX+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated assembly and thermal performance (θJA = 255.9°C/W on multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push/pull reset output; sinks ≥1.2mA and sources ≥500µA; valid down to VCC = 1V. |
| 2 | GND | Ground reference for all internal circuits and reset timing; must be low-impedance connection. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 52kΩ; accepts TTL/CMOS logic levels. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets internal timer on transition; disable by leaving floating. |
| 5 | VCC | Supply input; monitors voltage for reset assertion; absolute max = +6V; operates down to +1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated 52kΩ MR pullup, laser-trimmed voltage divider, and push/pull RESET driver eliminate BOM cost and layout area. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout or battery depletion, preventing undefined µP states. |
| Immunity to short negative VCC transients | Withstands ≤4µs, 100mV-under-threshold glitches - avoids spurious resets in noisy power environments. |
| AEC-Q100 qualified | Validated for automotive-grade reliability (Grade 1: -40°C to +125°C), supporting industrial and transportation applications. |
| Factory-trimmed precision thresholds | 4.63V reset threshold with ±1.5% tolerance at +25°C and ±2.5% over full temperature range - reduces calibration overhead. |
Applications
| Portable/Battery-Powered Equipment | Embedded Control Systems |
|---|---|
Use Scenario: Power management in handheld medical devices with Li-ion battery supply subject to voltage sag during peak load. IC Role / Device Role / Timing Role: Monitors VCC and asserts RESET when battery drops below 4.63V; holds reset for 140ms to ensure clean µP restart after recovery. Use Value: Prevents erratic firmware execution during brownout, eliminating data corruption and improving field reliability. | Use Scenario: Industrial PLC module requiring fail-safe startup and runtime watchdog supervision. IC Role / Device Role / Timing Role: Provides power-on reset and detects µP lockup via WDI toggling; asserts active-low RESET to force hardware recovery. Use Value: Enables autonomous recovery from software hangs without operator intervention or external reset button. |
| Intelligent Instruments | Controllers |
Use Scenario: Precision test equipment with multiple voltage rails where main 5V rail must stabilize before µP initialization. IC Role / Device Role / Timing Role: Supervises 5V rail only; generates synchronized reset pulse after 140ms delay once VCC exceeds 4.63V. Use Value: Eliminates need for RC-based reset timers with poor temperature stability and long-term drift. | Use Scenario: HVAC controller operating in wide ambient temperatures (-40°C to +85°C) with intermittent power interruptions. IC Role / Device Role / Timing Role: Delivers robust reset signaling across full industrial temp range; MR pin allows front-panel reset button integration. Use Value: Ensures consistent boot behavior despite thermal cycling and line disturbances, reducing field service calls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6318MHUK46BX+T | Bidirectional active-low RESET output instead of push/pull; includes internal 4.7kΩ pullup + active P-FET for fast rise time. | Required for µPs with bidirectional reset pins (e.g., Motorola 68HC11); incompatible with standard push/pull-only reset inputs. | Select MAX6318MHUK46BX+T only when interfacing with bidirectional-reset µPs; otherwise MAX6318LHUK46BX+T is optimal. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (not adjustable); 200ms reset timeout; no manual reset input; different pinout (5-pin SOT-23 but pin 3 = GND, pin 4 = MR). | Not suitable for 4.63V monitoring or MR-driven reset; lacks WDI watchdog functionality; requires PCB redesign due to pin mismatch. | Use TPS3808G33DBVR only in new designs targeting 3.3V systems without watchdog or manual reset needs. |
Compared with MAX6318MHUK46BX+T, the MAX6318LHUK46BX+T offers simpler push/pull drive and lower system-level timing uncertainty; compared with TPS3808G33DBVR, it provides precise 4.63V threshold, integrated watchdog, and MR support - making it superior for legacy 5V embedded systems requiring full supervisory feature set.
Availability
MAX6318LHUK46BX+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded control systems, intelligent instruments, and controllers requiring stable component supply, AEC-Q100 reliability, and factory-trimmed voltage accuracy.
Supply support for MAX6318LHUK46BX+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6316–MAX6322 product line delivers highly integrated, factory-configured supervisory circuits targeting space-constrained, reliability-critical embedded systems requiring precise voltage monitoring, watchdog safety, and manual reset capability.
FAQ
What is the exact reset threshold voltage of MAX6318LHUK46BX+T?
The MAX6318LHUK46BX+T has a factory-trimmed nominal reset threshold of 4.63V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during manufacturing and documented in Table 1 of the datasheet.
Does MAX6318LHUK46BX+T include a watchdog timer, and what is its timeout period?
Yes, MAX6318LHUK46BX+T includes a watchdog timer with a typical timeout period of 1.6 seconds. The 'X' in the part number denotes the 102ms/1.6s/25.6s family; per the Selector Guide and Table 3, 'X' corresponds to 1.6s typical. The timer resets on any WDI edge and asserts RESET if no transition occurs within that period.
What is the function of the MR pin on MAX6318LHUK46BX+T, and how should it be used?
The MR (Manual Reset) pin on MAX6318LHUK46BX+T is an active-low input that forces RESET assertion when pulled low. It features an internal 52kΩ pullup to VCC, so it may be left unconnected when unused. A momentary switch to ground provides hardware reset capability without external debouncing components.
Is MAX6318LHUK46BX+T compatible with 3.3V microcontrollers?
Yes, MAX6318LHUK46BX+T operates from VCC = 1.0V to 5.5V and guarantees RESET output performance (VOL ≤ 0.3V, VOH ≥ 0.8×VCC) down to VCC = 2.7V. Its 4.63V reset threshold is intended for 5V systems, but the device itself interfaces cleanly with 3.3V µPs when powered from 3.3V - though reset assertion will then occur at ~3.3V × (4.63/5.0) ≈ 3.05V.
What package type and RoHS status does MAX6318LHUK46BX+T use?
MAX6318LHUK46BX+T uses a 5-pin SOT23 package (outline 21-0057, land pattern 90-0174) with RoHS-compliant lead-free finish. The '+T' suffix explicitly denotes lead-free packaging, and the package code 'U5+2A' confirms this configuration per Maxim's package documentation.
MAX6318LHUK46BX+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6318LHUK46BX+T FAQ
1.How can I place an order for MAX6318LHUK46BX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6318LHUK46BX+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 MAX6318LHUK46BX+T reliable?
The price and inventory of MAX6318LHUK46BX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6318LHUK46BX+T is usually 5 days.
3.What payment methods are accepted for MAX6318LHUK46BX+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6318LHUK46BX+T transactions.
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4.How is shipping managed for MAX6318LHUK46BX+T?
MAX6318LHUK46BX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6318LHUK46BX+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 MAX6318LHUK46BX+T?
For technical support, including MAX6318LHUK46BX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6318LHUK46BX+T requirements.
6.How does Aetrix verify that MAX6318LHUK46BX+T is sourced from the original manufacturer or authorized distributors?
All MAX6318LHUK46BX+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 MAX6318LHUK46BX+T meets industry standards.
7.What is the process for return or replacement of MAX6318LHUK46BX+T?
All MAX6318LHUK46BX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6318LHUK46BX+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 MAX6318LHUK46BX+T part is unused and in its original packaging.
Return procedure for MAX6318LHUK46BX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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