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Analog Devices Inc./Maxim Integrated MAX6731AUTLD3+T
- Part No.:
- MAX6731AUTLD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731AUTLD3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,023
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Product details
Overview
MAX6731AUTLD3+T from Maxim Integrated is a single-voltage microprocessor supervisor IC with push-pull active-low reset output, manual reset input, and independent push-pull watchdog output. It monitors VCC1 at +4.625V nominal threshold (LT suffix), provides 140–280ms reset timeout (D3), and operates over –40°C to +125°C. Used in telecom power sequencing and industrial controllers where reliable brownout detection and watchdog supervision are critical.
For engineers reviewing the MAX6731AUTLD3+T datasheet, MAX6731AUTLD3+T pinout, MAX6731AUTLD3+T application, or MAX6731AUTLD3+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed thermal performance, and real-world substitution guidance - all specific to the MAX6731AUTLD3+T variant with LT/D3 configuration and +T lead-free packaging.
Technical Context
The MAX6731AUTLD3+T implements a dual-mode watchdog timer: 35s minimum startup delay after reset assertion, followed by 1.12s minimum normal-mode timeout. Its reset logic guarantees valid RST output down to VCC1 = +0.8V, with 45µs VCC-to-RST propagation delay and 0.5% reset threshold hysteresis referenced to typical VTH1.
It features factory-set VCC1 reset threshold of +4.625V (LT suffix), push-pull RST and WDO outputs, integrated 50kΩ MR pullup, and immunity to VCC transients ≤10µs at 75mV overdrive - confirmed across full –40°C to +125°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V (LT suffix); precise brownout detection for +5V rail monitoring |
| Reset Timeout Period | 140–280ms (D3 suffix); ensures sufficient processor initialization time |
| Supply Current | 14µA typical at +3.6V; enables ultra-low-power operation in battery-backed systems |
| Watchdog Startup Delay | 35s minimum after reset; accommodates complex boot sequences before watchdog enforcement |
| RST Output Type | Active-low push-pull; eliminates need for external pullup resistor in most µP interfaces |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| MR Input Threshold | VIL = 0.3×VCC1, VIH = 0.7×VCC1; compatible with standard CMOS logic levels |
Pinout & Package
MAX6731AUTLD3+T is housed in a 6-pin SOT23-6 package (U6-1 pkg code), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and lead-free (+T) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1 undervoltage, MR assertion, or watchdog timeout; no external pullup required |
| 2 - GND | Ground reference | Common return path for VCC1, MR, WDI, RST, and WDO; must be low-impedance |
| 3 - WDO | Active-low watchdog output | Push-pull driver; asserts low if WDI lacks edge transition within 1.12s (normal mode) or 35s (startup mode) |
| 4 - MR | Active-low manual reset input | Internally pulled up to VCC1 (50kΩ); drives RST low when asserted; supports momentary switch interface |
| 5 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on rising or falling transition; floating state does not disable watchdog |
| 6 - VCC1 | Primary supply voltage input | Powers device and feeds primary reset comparator; monitored at +4.625V threshold; valid down to +0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout enables robust boot supervision without false triggers |
| Guaranteed reset validity | RST remains functional down to VCC1 = +0.8V - critical for graceful shutdown during deep brownouts |
| Immunity to VCC transients | Rejects falling transients ≤10µs at 75mV overdrive - prevents spurious resets in noisy power rails |
| Low quiescent current | 14µA typical at +3.6V - extends battery life in portable equipment and backup systems |
| Factory-trimmed precision threshold | +4.625V VCC1 reset threshold with ±125mV tolerance and 20ppm/°C tempco - eliminates external resistor networks |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Monitoring +5V main rail in carrier-grade line cards during hot-swap insertion and AC brownout events. IC Role / Device Role / Timing Role: Single-rail supervisor asserting reset to ARM-based controller and FPGA configuration logic upon VCC1 drop below +4.625V. Use Value: 140–280ms D3 timeout ensures complete FPGA reconfiguration before release; push-pull RST avoids timing uncertainty from external pullup RC delays. |
Use Scenario: Ensuring deterministic restart after power interruption in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary supervisor for 24V-to-5V DC/DC output, interfacing with Cortex-M7 MCU via bidirectional reset pin through 10kΩ isolation resistor. Use Value: 35s watchdog startup delay accommodates bootloader execution; push-pull WDO directly drives safety relay without level-shifting. |
| Server Management Controller | Medical Diagnostic Equipment |
|
Use Scenario: Supervising BMC (Baseboard Management Controller) power domain in redundant 12V/5V server PSUs. IC Role / Device Role / Timing Role: Resets AST2500 BMC on VCC1 undervoltage; manual reset triggered by front-panel service button via MR pin. Use Value: Integrated 50kΩ MR pullup simplifies board layout; -40°C to +125°C rating supports operation near PSU heat sinks. |
Use Scenario: Providing fail-safe reset to imaging subsystem FPGA during MRI gradient coil power cycling. IC Role / Device Role / Timing Role: Monitors isolated +5V imaging rail; asserts RST on transient-induced dips exceeding 75mV for >10µs. Use Value: Immunity to EMI-induced VCC glitches prevents unintended image acquisition aborts; 14µA supply current minimizes self-heating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730AUTLD3+T | Open-drain RST output; identical VCC1 threshold (+4.625V), timeout (D3), and watchdog behavior | Requires external pullup resistor on RST; suitable where bus-wired reset lines or level translation needed | Select when system architecture mandates open-drain reset signaling or shared reset busing |
| TPS3808G33DBVR | Single-supply supervisor with +3.3V fixed threshold; 200ms timeout; no manual reset input; different watchdog architecture (no startup delay) | Lacks MR pin and adjustable startup timing; optimized for simpler, lower-voltage embedded systems | Choose only if +3.3V rail monitoring suffices and manual reset is unnecessary; verify watchdog timing compatibility |
Compared with MAX6731AUTLD3+T, MAX6730AUTLD3+T offers identical supervision accuracy and timing but requires external pullup hardware, while TPS3808G33DBVR trades manual reset and flexible watchdog startup for lower cost and smaller footprint in less demanding applications.
Availability
MAX6731AUTLD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical electronics requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6731AUTLD3+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6730A–MAX6735A family delivers precision multi-rail supervision with integrated watchdog timers, targeting systems where reliability, temperature resilience, and minimal external components are essential.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731AUTLD3+T?
The MAX6731AUTLD3+T has a factory-set VCC1 reset threshold of +4.625V (LT suffix), with a guaranteed range of +4.500V to +4.750V at +25°C and ±125mV tolerance over –40°C to +125°C. This value is laser-trimmed during production and documented in Table 1 of the MAX6730A–MAX6735A datasheet. The MAX6731AUTLD3+T uses this exact threshold for reliable +5V rail supervision.
Does MAX6731AUTLD3+T support manual reset functionality?
Yes, MAX6731AUTLD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion for the full reset timeout period (140–280ms). The MR pin accepts standard CMOS logic levels and supports direct connection to momentary switches or FPGA GPIOs. This feature is confirmed in the Pin Description table and Applications Information section of the MAX6731AUTLD3+T datasheet.
What is the watchdog timeout behavior of MAX6731AUTLD3+T during power-up?
MAX6731AUTLD3+T implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enters a 35s minimum startup delay before enforcing the normal 1.12s timeout. This allows complex boot sequences to complete before watchdog supervision begins. The MAX6731AUTLD3+T maintains this behavior across its full –40°C to +125°C range and is explicitly specified in the Electrical Characteristics table under "Watchdog Timeout Period".
Is MAX6731AUTLD3+T compatible with bidirectional µP reset pins?
Yes, but requires a 10kΩ series resistor between RST and the µP's bidirectional reset I/O port to prevent logic contention - as shown in Figure 5 of the MAX6731AUTLD3+T datasheet. This is necessary because MAX6731AUTLD3+T's push-pull RST actively drives both high and low states, unlike open-drain variants. The resistor ensures safe voltage-level interaction without damaging either device.
What package and lead finish does MAX6731AUTLD3+T use?
MAX6731AUTLD3+T uses a 6-pin SOT23-6 package (U6-1 pkg code) with lead-free (+T) finish, compliant with RoHS and JEDEC MO-178 standards. Dimensions are 2.9mm × 1.6mm × 1.1mm, and the top mark reads "+ACJG". This packaging is confirmed in the Ordering Information table and Package Information section of the official MAX6730A–MAX6735A datasheet.
MAX6731AUTLD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6731AUTLD3+T FAQ
1.How can I place an order for MAX6731AUTLD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731AUTLD3+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 MAX6731AUTLD3+T reliable?
The price and inventory of MAX6731AUTLD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731AUTLD3+T is usually 5 days.
3.What payment methods are accepted for MAX6731AUTLD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731AUTLD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731AUTLD3+T?
MAX6731AUTLD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731AUTLD3+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 MAX6731AUTLD3+T?
For technical support, including MAX6731AUTLD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731AUTLD3+T requirements.
6.How does Aetrix verify that MAX6731AUTLD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6731AUTLD3+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 MAX6731AUTLD3+T meets industry standards.
7.What is the process for return or replacement of MAX6731AUTLD3+T?
All MAX6731AUTLD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731AUTLD3+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 MAX6731AUTLD3+T part is unused and in its original packaging.
Return procedure for MAX6731AUTLD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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