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Analog Devices Inc./Maxim Integrated MAX6746KA26+T
- Part No.:
- MAX6746KA26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:6,838
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Product details
Overview
MAX6746KA26+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.625V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and standard watchdog timer. It monitors single-supply voltage (1.2V–5.5V), asserts active-low push-pull RESET during brownout or manual reset, and operates across -40°C to +125°C for automotive power-rail monitoring.
For engineers reviewing the MAX6746KA26+T datasheet, MAX6746KA26+T pinout, MAX6746KA26+T application, or MAX6746KA26+T equivalent, this device supports critical μP reset integrity in battery-powered controllers, medical equipment, and intelligent instruments where supply transient immunity and AEC-Q100 qualification are required.
Technical Context
The MAX6746KA26+T implements a fixed-threshold VCC monitor with hysteresis (0.8% of VTH) and a manual-reset input (MR) internally pulled up to VCC. Its reset assertion is immune to transients ≤50µs when VCC dips 100mV below threshold, and RESET remains valid down to VCC = 1V.
It features capacitor-programmable reset timeout (tRP = 4.94×10⁶ × CSRT) and standard watchdog timeout (tWD = 4.94×10⁶ × CSWT), with no windowed or extended-mode capability-distinguishing it from MAX6752/MAX6753 or MAX6746–MAX6751 variants with WDS pin support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2% (factory-trimmed); ensures reliable reset assertion at precise VCC brownout level |
| Supply Voltage Range | 1.2V to 5.5V; supports operation from Li-ion battery min to 5V logic rails |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable controllers |
| Reset Timeout | 5.69–9.49ms (CSRT = 1500pF); configurable via external capacitor for μP power-up timing compliance |
| Watchdog Timeout | 5.69–9.49ms (CSWT = 1500pF); user-adjustable fault detection window for firmware supervision |
| Operating Temp | -40°C to +125°C; fully specified for under-hood automotive and industrial embedded use |
| Reset Output Type | Active-low push-pull; drives μP reset pin directly without external pullup |
Pinout & Package
MAX6746KA26+T is housed in an 8-pin SOT23 package (outline 21-0078), footprint-compatible with JEDEC MO-178AA, and optimized for high-density PCB layouts in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Internally pulled up; falling edge ≥1µs asserts RESET for full timeout period |
| 2 | WDS (Watchdog Select) | Not functional in MAX6746KA26+T; tied to GND or VCC per design but unused |
| 3 | SWT (Watchdog Timeout) | Capacitor-to-GND sets tWD; no extended mode support in this variant |
| 4 | SRT (Reset Timeout) | Capacitor-to-GND sets tRP; determines minimum reset pulse width after recovery |
| 5 | GND | Ground reference for all internal comparators and output stage |
| 6 | WDI (Watchdog Input) | Falling edge clears watchdog timer; must not float (100kΩ pulldown recommended) |
| 7 | RESET | Push-pull active-low output; sinks 50µA @ 0.3V max VOL; guaranteed valid ≥1V VCC |
| 8 | VCC | Power supply input and monitored rail; absolute max 6.0V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.625V reset threshold | Eliminates external resistor divider; reduces BOM count and layout area for single-rail monitoring |
| Capacitor-adjustable reset timeout | Enables precise matching to μP's power-on reset timing requirement without trimming resistors |
| Capacitor-adjustable watchdog timeout | Allows firmware developers to tune fault detection window to software execution cycle time |
| 3.7µA supply current at 2.0V | Extends battery runtime in portable medical devices and remote sensors beyond 5 years |
| AEC-Q100 qualified | Validated for automotive temperature range and reliability; suitable for ASIL-B supporting systems |
Applications
| Automotive Power-Rail Monitoring | Portable Medical Instrumentation |
|---|---|
Use Scenario: Monitoring 3.3V or 5V ECU power rail during cold-crank or load-dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET when VCC drops below 2.625V ±2%, holding reset for 7.6ms to ensure clean μP restart. Use Value: Prevents erratic code execution during voltage sags; meets ISO 16750-2 transient immunity requirements. | Use Scenario: Battery-powered glucose meter requiring guaranteed reset during Li-ion discharge from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Single-supply supervisor with 2.625V threshold and 3.7µA ICC, enabling >7-year shelf life. Use Value: Eliminates need for external reset IC biasing; maintains reset validity down to VCC = 1V. |
| Intelligent Industrial Sensor Node | Battery-Powered Controller |
Use Scenario: Wireless sensor node powered by coin cell, waking periodically to sample and transmit data. IC Role / Device Role / Timing Role: Resets host MCU on undervoltage, with capacitor-tuned 7.6ms timeout aligned to wake-up sequence timing. Use Value: Guarantees deterministic boot state after brownout; avoids corrupted sensor readings or failed transmissions. | Use Scenario: HVAC controller using 3.3V rail derived from buck converter with variable load transients. IC Role / Device Role / Timing Role: Detects fast VCC glitches (≤50µs, 100mV dip) without false reset, thanks to built-in transient immunity. Use Value: Maintains system uptime during switching noise; eliminates spurious reboots in noisy industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA26+T | Same 2.625V threshold and SOT23 package, but open-drain RESET output instead of push-pull | Requires external pullup; suited for level-shifting or wired-OR reset buses | Select MAX6747KA26+T only if open-drain interface or multi-source reset arbitration is needed |
| TPS3808G26DBVR | 2.63V threshold (±0.5%), 1.5µA ICC, fixed 200ms reset timeout, no adjustable watchdog | Lacks capacitor-programmable timeouts; better for ultra-low-power, fixed-timing applications | Choose TPS3808G26DBVR when minimal quiescent current and simple fixed reset timing outweigh adjustability needs |
Compared with MAX6747KA26+T, MAX6746KA26+T provides direct-drive push-pull RESET without pullup, simplifying layout; versus TPS3808G26DBVR, it trades lower ICC for full timeout adjustability and watchdog supervision-critical for firmware-recovery-critical systems.
Availability
MAX6746KA26+T is available at Aetrix Electronics and suitable for automotive power-rail monitoring, portable medical instrumentation, and intelligent industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6746KA26+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
Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and reliability-critical applications.
The MAX6746–MAX6753 product line delivers AEC-Q100-qualified μP supervisors with configurable reset/watchdog functions for automotive, medical, and industrial embedded systems demanding robust power-rail monitoring.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6746KA26+T?
The MAX6746KA26+T has a factory-trimmed VCC reset threshold of 2.625V with ±2% tolerance over -40°C to +125°C. This value corresponds to suffix "26" per Table 2 in the datasheet and is laser-trimmed at wafer test-no external resistor divider is required for single-rail monitoring. The MAX6746KA26+T uses this fixed threshold exclusively; it does not support adjustable RESET IN monitoring.
Does the MAX6746KA26+T support windowed watchdog functionality?
No, the MAX6746KA26+T does not support windowed watchdog functionality. It implements only the standard watchdog timer found in MAX6746–MAX6751 devices, with timeout adjustable via CSWT capacitor. Windowed watchdog (min/max timing detection) is exclusive to MAX6752/MAX6753 variants. The MAX6746KA26+T lacks SET0/SET1 pins and associated window-ratio logic.
What is the maximum supply voltage rating for the MAX6746KA26+T?
The MAX6746KA26+T has an absolute maximum VCC rating of +6.0V, with operational specification from 1.2V to 5.5V. Exceeding 6.0V may cause permanent damage. The device guarantees valid RESET output down to VCC = 1.0V, and its internal comparators remain functional across the full -40°C to +125°C automotive temperature range at these voltages.
Can the MAX6746KA26+T be used with a 1.8V supply rail?
Yes, the MAX6746KA26+T operates reliably at 1.8V supply, with supply current specified at 4.2–9µA (typ–max) and reset threshold accuracy maintained. Its 2.625V threshold makes it unsuitable for direct 1.8V rail monitoring-but it can supervise higher rails (e.g., 3.3V or 5V) while being powered from a separate 1.8V domain, provided VCC ≥1.2V and RESET output logic levels are compatible with the target μP.
Is the MAX6746KA26+T pin-compatible with other devices in the MAX6746–MAX6753 family?
The MAX6746KA26+T shares the same 8-pin SOT23 package and pinout as MAX6746–MAX6751 variants, including identical MR, WDS, SWT, SRT, GND, WDI, RESET, and VCC assignments. However, functional pin usage differs: WDS is unused in MAX6746KA26+T, and it lacks SET0/SET1 pins present in MAX6752/MAX6753-so electrical compatibility requires verifying feature alignment, not just pin count or position.
MAX6746KA26+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- 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-23-8
MAX6746KA26+T FAQ
1.How can I place an order for MAX6746KA26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA26+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 MAX6746KA26+T reliable?
The price and inventory of MAX6746KA26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA26+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA26+T?
MAX6746KA26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA26+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 MAX6746KA26+T?
For technical support, including MAX6746KA26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA26+T requirements.
6.How does Aetrix verify that MAX6746KA26+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA26+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 MAX6746KA26+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA26+T?
All MAX6746KA26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA26+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 MAX6746KA26+T part is unused and in its original packaging.
Return procedure for MAX6746KA26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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