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Analog Devices Inc./Maxim Integrated MAX6751KA16+T
- Part No.:
- MAX6751KA16+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA16+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6751KA16+T from Analog Devices is a low-power microprocessor supervisory circuit with dual-voltage monitoring (VCC and adjustable RESET IN), ±2% factory-trimmed 1.575V reset threshold, capacitor-adjustable 7.59ms reset timeout (CSRT = 1500pF), and extended-mode watchdog timeout up to 1214ms (CSWT = 1500pF, WDS = VCC). It operates across -40°C to +125°C and delivers 3.7µA supply current at VCC ≤ 2.0V, serving automotive engine control units requiring robust brownout detection and fail-safe reset assertion.
For engineers reviewing the MAX6751KA16+T datasheet, MAX6751KA16+T pinout, MAX6751KA16+T application, or MAX6751KA16+T equivalent, this page provides verified reset threshold accuracy, SOT23-8 pin mapping, dual-supply monitoring capability, AEC-Q100 qualification status, and capacitor-based timing design guidance - all confirmed for the exact MAX6751KA16+T variant.
Technical Context
The MAX6751KA16+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 1.575V threshold (±2%), while the second monitors an external voltage via RESET IN with a fixed 1.235V input threshold. Its dual-monitoring architecture asserts RESET if either VCC drops below 1.575V or RESET IN falls below 1.235V.
It implements a selectable watchdog timer with normal/extended modes controlled by WDS: in extended mode (WDS = VCC), the basic timeout period (determined by CSWT) is multiplied by 128x. The reset timeout (tRP) and watchdog timeout (tWD) are both set using external capacitors connected to SRT and SWT pins respectively, with scaling factors of 4.94×10⁶ s/F.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 1.575V ±2% (factory-trimmed VCC monitor); enables precise brownout detection without external resistors |
| RESET IN Threshold | 1.235V ±0.8% (fixed internal reference); allows external voltage monitoring via resistor divider |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; reduces quiescent power in battery-backed systems |
| Reset Timeout Period | 7.59ms typical (CSRT = 1500pF); ensures μP initialization completes before release |
| Watchdog Timeout (Extended) | 971.5ms typical (CSWT = 1500pF, WDS = VCC); supports long software execution cycles |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive applications |
| Package | 8-pin SOT23; footprint-compatible with industry-standard space-constrained PCB layouts |
Pinout & Package
MAX6751KA16+T is housed in an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), RoHS-compliant, with thermal resistance θJA = 196°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET IN | High-impedance input for externally monitored voltage; threshold fixed at 1.235V |
| 2 | GND | Ground reference for all internal comparators and output drivers |
| 3 | SWT | Capacitor-connected input setting watchdog timeout; extended mode multiplies by 128x |
| 4 | SRT | Capacitor-connected input setting reset timeout period (tRP = 4.94×10⁶ × CSRT) |
| 5 | VCC | Power supply input and monitored rail; valid operation from 1.2V to 5.5V |
| 6 | RESET | Active-low push-pull reset output; guaranteed valid down to VCC = 1V |
| 7 | WDI | Watchdog input; falling edge clears timer; must not float (100kΩ pull-down recommended) |
| 8 | WDS | Watchdog select input; GND = normal mode, VCC = extended mode (128× timeout) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (1.575V) and external rail (via RESET IN at 1.235V), enabling fault detection across multiple power domains |
| Capacitor-adjustable timing | Independent SRT and SWT pins allow precise, layout-tunable reset and watchdog timeouts without trimming resistors |
| 128× extended watchdog mode | WDS pin selects extended timeout - critical for μPs with infrequent watchdog servicing (e.g., sleep-mode firmware) |
| AEC-Q100 qualified | Qualified for automotive applications per AEC-Q100 Rev H, supporting deployment in engine control, ADAS, and body electronics |
| Low-voltage operation | Guaranteed RESET validity down to VCC = 1V ensures reliable reset assertion during deep brownout conditions |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V microcontroller core rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset when either rail dips below threshold; 7.59ms timeout accommodates ECU boot sequence. Use Value: Prevents erratic MCU behavior during transient voltage sags, meeting ISO 7637-2 pulse 4 immunity requirements. |
Use Scenario: Supervises battery-backed 3.3V logic rail and isolated 5V motor driver supply in portable infusion devices. IC Role / Device Role / Timing Role: Provides independent reset assertion on either supply failure; extended watchdog guards against firmware lockup during therapy delivery. Use Value: Ensures fail-safe shutdown and restart within FDA-required safety margins for Class II medical devices. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Watches 24V field bus supply (via resistor divider on RESET IN) and 3.3V processor rail in harsh factory environments. IC Role / Device Role / Timing Role: Resets PLC controller upon undervoltage on either domain; 128× watchdog mode aligns with cyclic scan intervals. Use Value: Eliminates need for discrete RC timing networks, reducing BOM count and improving long-term timing stability over temperature. |
Use Scenario: Monitors 3.3V metrology SoC supply and 5V communication interface rail in ANSI C12.20-certified meters. IC Role / Device Role / Timing Role: Asserts hardware reset on brownout; capacitor-adjustable watchdog prevents meter freeze during firmware updates. Use Value: Meets IEC 62056-21 data integrity requirements by guaranteeing deterministic recovery from power interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA16+T | Same 1.575V VCC threshold and RESET IN input, but includes manual-reset input (MR) instead of WDS | Preferred where operator-initiated reset is required (e.g., field service panels), not for watchdog extension | Select MAX6750KA16+T only if MR functionality is needed; MAX6751KA16+T is optimal for watchdog-critical designs |
| TPS3808G16DBVR | 1.6V fixed threshold (±0.5%), no adjustable RESET IN, no extended watchdog mode, 1.8µA ICC | Suitable for single-rail monitoring only; lacks dual-supply capability and 128× timeout scaling | Choose TPS3808G16DBVR for cost-sensitive, single-threshold applications where extended watchdog is unnecessary |
Compared with MAX6750KA16+T and TPS3808G16DBVR, the MAX6751KA16+T uniquely combines factory-trimmed dual-rail supervision with scalable watchdog timing - making it the only option among the three that supports both external voltage monitoring and 128× timeout extension in a single SOT23-8 device.
Availability
MAX6751KA16+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and smart energy meters requiring stable component supply across extended temperature ranges and AEC-Q100 compliance.
Supply support for MAX6751KA16+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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, emphasizing ultra-low power, wide-temperature operation, and flexible reset/watchdog configuration via external capacitors.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6751KA16+T?
The MAX6751KA16+T features a factory-trimmed VCC reset threshold of 1.575V with ±2% tolerance over -40°C to +125°C. This value is confirmed in Table 2 (suffix "16") and Electrical Characteristics section of the datasheet. The device also includes a separate 1.235V ±0.8% threshold for the RESET IN pin, enabling dual-supply monitoring without external components.
Does MAX6751KA16+T support both push-pull and open-drain RESET outputs?
No - the MAX6751KA16+T is configured as a push-pull active-low RESET output, as indicated by the "K" in the package code (per Ordering Information) and confirmed in Pin Descriptions. Unlike variants with "L" suffix, it does not offer open-drain configuration. The push-pull output guarantees valid logic levels down to VCC = 1V and eliminates need for external pull-up resistors.
How is the watchdog timeout extended in MAX6751KA16+T?
The MAX6751KA16+T extends watchdog timeout by 128× when the WDS pin is driven high (to VCC). With CSWT = 1500pF, the extended timeout is 971.5ms (typical), versus 7.59ms in normal mode. This mode is enabled solely by WDS voltage level - no register writes or configuration sequences are required, making it ideal for simple, reliable firmware supervision.
Can MAX6751KA16+T monitor two different supply voltages simultaneously?
Yes - the MAX6751KA16+T performs true dual-voltage monitoring: its internal comparator watches VCC against the 1.575V factory threshold, while a second comparator monitors the RESET IN pin against a fixed 1.235V reference. This allows independent supervision of, for example, a 5V system rail and a 3.3V processor core rail using an external resistor divider on RESET IN.
Is MAX6751KA16+T qualified for automotive applications?
Yes - the MAX6751KA16+T is AEC-Q100 qualified (Grade 0: -40°C to +125°C), as explicitly stated in the Benefits and Features section and Ordering Information. Its specifications - including supply current, reset threshold accuracy, and timing parameters - are fully guaranteed across this automotive temperature range, supporting use in engine control, body electronics, and ADAS subsystems.
MAX6751KA16+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:
- 2
- Voltage - Threshold:
- 1.575V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6751KA16+T FAQ
1.How can I place an order for MAX6751KA16+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA16+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 MAX6751KA16+T reliable?
The price and inventory of MAX6751KA16+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA16+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA16+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA16+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA16+T?
MAX6751KA16+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA16+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 MAX6751KA16+T?
For technical support, including MAX6751KA16+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA16+T requirements.
6.How does Aetrix verify that MAX6751KA16+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA16+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 MAX6751KA16+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA16+T?
All MAX6751KA16+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA16+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 MAX6751KA16+T part is unused and in its original packaging.
Return procedure for MAX6751KA16+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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