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Analog Devices Inc./Maxim Integrated MAX6725AKALTD3+T
- Part No.:
- MAX6725AKALTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKALTD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
MAX6725AKALTD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 280ms minimum reset timeout, and push-pull active-low RST output - used to ensure reliable power-on reset and brownout protection in telecom power systems.
For engineers reviewing the MAX6725AKALTD3+T datasheet, MAX6725AKALTD3+T pinout, MAX6725AKALTD3+T application, or MAX6725AKALTD3+T equivalent, key selection criteria include dual-rail voltage monitoring capability down to 0.8V supply operation, manual-reset input with internal 50kΩ pullup, watchdog disable support via unconnected WDI, and guaranteed reset validity across -40°C to +125°C industrial temperature range.
Technical Context
The MAX6725AKALTD3+T integrates dual independent voltage comparators for VCC1 and VCC2, each with ±0.5% hysteresis and 20ppm/°C tempco, feeding a digital reset timeout timer with fixed 280ms (D5 suffix) delay. Its push-pull RST output is referenced to VCC1 and sinks ≥1.2mA at 2.7V, while MR input accepts CMOS-compatible logic levels with 1µs minimum pulse width and 100ns glitch rejection.
This variant includes manual-reset (MR) and watchdog-disable functionality (WDI unconnected), but excludes RSTIN, PFI/PFO, and RST2 - confirmed by its MAX6725A ordering code and pin mapping (VCC1, VCC2, GND, MR, RST, WDI). It operates with supply current as low as 10µA (typ) at 3.6V and remains functional with either VCC1 or VCC2 ≥ 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed - ensures reliable reset assertion when primary 5V rail drops below safe operating level |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed - monitors secondary 3.3V rail with precision suitable for I/O supply supervision |
| Reset Timeout Period | 280ms (min), D5 suffix - provides sufficient hold time for full system initialization after power recovery |
| Supply Current | 10µA (typ) at 3.6V - enables long battery life in portable equipment without compromising supervision accuracy |
| Operating Temperature | -40°C to +125°C - supports deployment in automotive under-hood and industrial control environments |
| Reset Output Type | Push-pull, active-low RST - eliminates need for external pullup resistor and drives directly into μP reset pin |
| MR Input Pullup | 50kΩ internal to VCC1 - simplifies manual-reset implementation with momentary switch to GND only |
Pinout & Package
MAX6725AKALTD3+T is housed in a 6-pin SOT23-6 package (package code U6+1), with 1.6mm × 2.9mm footprint and 1.1mm height, optimized for space-constrained PCB layouts in telecom and embedded systems.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2 undervoltage or MR activation |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual-reset input with internal 50kΩ pullup to VCC1; resets system when pulled low |
| 4 | VCC2 | Secondary supply input (0.8V–5.5V); powers internal circuitry when > VCC1 and sets VCC2 threshold comparator reference |
| 5 | VCC1 | Primary supply input (0.8V–5.5V); powers device when > VCC2 and sets VCC1 threshold comparator reference |
| 6 | WDI | Watchdog input; left unconnected to disable watchdog function; detects rising/falling edges to prevent timeout |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 and VCC2 rails with separate factory-trimmed thresholds avoids single-point failure in multirail systems |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 dips near shutdown threshold |
| Immunity to short VCC transients | Rejects glitches ≤20µs (at 100mV overdrive), preventing spurious resets during switching noise or load transients |
| Low 10µA supply current | Minimizes standby power draw in always-on applications such as remote sensors and network edge devices |
| Integrated MR pullup resistor | Eliminates external component count for manual reset, reducing BOM cost and board area in compact designs |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring primary 5V and secondary 3.3V rails in line-card power supplies with hot-swap capability. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting reset until both supplies stabilize post-insertion, with 280ms timeout ensuring FPGA configuration completes. Use Value: Prevents corrupted firmware load during partial power-up by holding μP in reset until both rails exceed 4.625V and 3.075V respectively. |
Use Scenario: Supervising main 24V DC-DC converted rails (5V, 3.3V) in programmable logic controller backplane. IC Role / Device Role / Timing Role: Fault-detection node triggering system-wide reset on undervoltage, with MR enabling field-service forced reboot. Use Value: Enables deterministic recovery from brownout events in harsh EMI environments without requiring external timing components. |
| Network Router Baseboard | Automotive Infotainment Module |
Use Scenario: Ensuring clean boot sequence for ARM-based SoC and DDR memory on multi-layer router motherboard. IC Role / Device Role / Timing Role: Primary reset generator coordinating power-good sequencing between PMIC outputs and processor core/I/O domains. Use Value: Eliminates race conditions between voltage rails by enforcing strict 280ms reset hold time after both VCC1 and VCC2 rise above thresholds. |
Use Scenario: Supervising 5V MCU supply and 3.3V CAN transceiver supply in head-unit control module exposed to automotive load-dump transients. IC Role / Device Role / Timing Role: Brownout detector maintaining reset during cold-crank (6V battery dip) and reasserting on recovery. Use Value: Guarantees μP remains held in reset until both rails sustain >4.625V and >3.075V for ≥280ms, preventing erratic CAN bus behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726AKALTD3+T | Same pinout and package, but features active-high RST output instead of active-low | Required when host μP demands active-high reset assertion (e.g., certain ARM Cortex-M series) | Select MAX6726AKALTD3+T only if system-level reset polarity mandates high-true signaling |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 input; 200ms timeout; open-drain RST; requires external pullup | Limited to 3.3V-only systems; lacks secondary rail monitoring and manual reset integration | Choose only for cost-sensitive, single-rail applications where dual-supply supervision is unnecessary |
Compared with MAX6725AKALTD3+T, MAX6726AKALTD3+T offers identical supervision accuracy and timing but inverted reset polarity, while TPS3808G33DBVR reduces feature set to cut cost - making MAX6725AKALTD3+T optimal for dual-rail systems needing push-pull active-low reset with integrated MR.
Availability
MAX6725AKALTD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC controllers, and automotive infotainment modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6725AKALTD3+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 communications applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits targeting multivoltage systems where reliability, small size, and wide temperature operation are critical - especially in space-constrained, high-reliability embedded platforms.
FAQ
What is the reset threshold voltage for VCC1 on the MAX6725AKALTD3+T?
The MAX6725AKALTD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with tolerance of ±0.125V (4.500V to 4.750V min/max). This value is fixed per the 'K' suffix in the part number and applies across the full -40°C to +125°C operating range with 20ppm/°C tempco. The MAX6725AKALTD3+T uses this threshold to assert RST when the primary 5V rail falls below specification.
Does the MAX6725AKALTD3+T support manual reset functionality?
Yes, the MAX6725AKALTD3+T includes an active-low manual-reset (MR) input on Pin 3, featuring an internal 50kΩ pullup resistor to VCC1. Pulling MR low for ≥1µs forces RST assertion for the full 280ms timeout period, even if VCC1/VCC2 remain valid. This allows field technicians or system logic to initiate controlled reboots without power cycling. The MAX6725AKALTD3+T does not require external pullup components for MR operation.
What is the reset timeout period of the MAX6725AKALTD3+T and how is it set?
The MAX6725AKALTD3+T has a fixed minimum reset timeout period of 280ms, indicated by the 'D5' suffix in the part number. This value is internally programmed and non-adjustable. The timeout begins when VCC1 or VCC2 falls below its respective threshold and continues after both supplies recover - ensuring the microprocessor remains held in reset long enough for complete system stabilization. This timing is guaranteed over temperature and supply voltage for the MAX6725AKALTD3+T.
Is the MAX6725AKALTD3+T compatible with 3.3V-only systems?
No - the MAX6725AKALTD3+T requires both VCC1 and VCC2 supplies to be present and within 0.8V–5.5V range for guaranteed operation. Its VCC1 threshold is fixed at 4.625V, making it unsuitable for pure 3.3V systems. For 3.3V-only supervision, consider alternatives like MAX6326 or TPS3808G33. The MAX6725AKALTD3+T is specifically designed for dual-rail systems where one rail is ~5V and the other is ~3.3V.
What package type and footprint does the MAX6725AKALTD3+T use?
The MAX6725AKALTD3+T is packaged in a 6-pin SOT23-6 (U6+1) case measuring 1.6mm × 2.9mm with 1.1mm height and standard 0.95mm pin pitch. It uses JEDEC MO-178AC outline and land pattern 90-0175. This compact RoHS-compliant package supports automated assembly and thermal performance of θJA = 115°C/W on multilayer boards - ideal for dense telecom and industrial PCB layouts where the MAX6725AKALTD3+T is commonly deployed.
MAX6725AKALTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.075V, 4.625V, Adj
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725AKALTD3+T FAQ
1.How can I place an order for MAX6725AKALTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKALTD3+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 MAX6725AKALTD3+T reliable?
The price and inventory of MAX6725AKALTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKALTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725AKALTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKALTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKALTD3+T?
MAX6725AKALTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKALTD3+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 MAX6725AKALTD3+T?
For technical support, including MAX6725AKALTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKALTD3+T requirements.
6.How does Aetrix verify that MAX6725AKALTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725AKALTD3+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 MAX6725AKALTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6725AKALTD3+T?
All MAX6725AKALTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKALTD3+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 MAX6725AKALTD3+T part is unused and in its original packaging.
Return procedure for MAX6725AKALTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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