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Analog Devices Inc./Maxim Integrated MAX6751KA46+T
- Part No.:
- MAX6751KA46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA46+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
MAX6751KA46+T from Analog Devices is a low-power microprocessor supervisory IC that monitors dual supply voltages (VCC and external RESET IN), provides capacitor-adjustable reset timeout (5.7–9.5 ms) and watchdog timeout (5.7–9.5 ms normal / 729–1214 ms extended), and features ±2% factory-trimmed 4.625V VCC reset threshold with hysteresis. It serves as a system-level safety monitor in automotive engine control units requiring AEC-Q100 qualification and robust transient immunity.
For engineers reviewing the MAX6751KA46+T datasheet, MAX6751KA46+T pinout, MAX6751KA46+T application, or MAX6751KA46+T equivalent, key selection criteria include dual-voltage monitoring capability, manual-reset input support, push-pull active-low RESET output, 3.7µA quiescent current at 1.8V, and guaranteed RESET validity down to VCC = 1V - all validated for operation across –40°C to +125°C.
Technical Context
The MAX6751KA46+T implements dual-threshold supervision: a factory-trimmed 4.625V ±2% comparator for VCC and an adjustable 1.235V ±0.019V comparator for external voltage monitoring via RESET IN pin. Its reset timeout (tRP) and watchdog timeout (tWD) are independently set using external capacitors CSRT and CSWT, with tRP = 4.94×10⁶ × CSRT and tWD = 4.94×10⁶ × CSWT (normal mode).
A dedicated WDS pin enables 128× watchdog timeout extension by switching between ground (normal) and VCC (extended) states; this toggle clears the internal watchdog timer. The device asserts RESET low on VCC drop below 4.625V, RESET IN drop below 1.235V, or MR pull-down, holding RESET low for tRP after recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.625V ±2% (VCC), 1.235V ±0.019V (RESET IN) - ensures precise brownout detection for both primary supply and auxiliary rail |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables battery-backed systems to maintain supervision >10 years on coin cell |
| Reset Timeout Period | 5.69–9.49 ms (CSRT = 100–1500 pF) - configurable to match µP power-up stabilization time |
| Watchdog Timeout | 5.69–9.49 ms (normal), 729–1214 ms (extended) - supports both fast-fault detection and long software cycles |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 Grade 0 |
| RESET Output Type | Push-pull active-low - eliminates need for external pull-up resistor and simplifies interface to 1.8V/3.3V/5V µP reset inputs |
| Power Supply Range | 1.2V to 5.5V - supports supervision of modern low-voltage logic rails and legacy 5V systems |
Pinout & Package
MAX6751KA46+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), measuring 2.9mm × 1.6mm × 1.1mm, with RoHS-compliant lead finish and thermal resistance θJA = 196°C/W on four-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET IN | High-impedance input for external voltage monitoring; sets adjustable reset threshold at 1.235V via resistor divider |
| 2 | GND | System ground reference for all analog comparators and digital logic |
| 3 | VCC | Main supply input (1.2–5.5V); powers internal circuitry and enables fixed 4.625V VCC reset monitoring |
| 4 | RESET | Push-pull active-low reset output; drives µP reset pin directly without pull-up; valid down to VCC = 1V |
| 5 | SWT | Watchdog timeout capacitor input; connects to GND to set tWD (normal/extended) or to disable watchdog |
| 6 | SRT | Reset timeout capacitor input; connects to GND to set tRP duration (5.7–9.5 ms range) |
| 7 | WDS | Watchdog select input; grounded for normal mode, tied to VCC for 128× extended timeout; clears timer on transition |
| 8 | MR | Manual-reset input; internally pulled up to VCC; falling edge ≥1µs asserts RESET for full tRP duration |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (4.625V ±2%) and external rail (via RESET IN at 1.235V) - eliminates need for second supervisor in multi-rail systems |
| Capacitor-adjustable timing | Independent CSRT and CSWT capacitors set reset and watchdog timeouts with 5:1 range each - avoids firmware dependency and enables hardware-only tuning |
| 128× watchdog extension | WDS pin toggles between normal and extended modes - supports both short-cycle firmware checks and long background task supervision |
| Transient-immune reset | Rejects VCC glitches ≤50µs when overdrive is ≤100mV - prevents spurious resets during ECU load-dump transients |
| AEC-Q100 qualified | Qualified to Grade 0 (–40°C to +125°C) with guaranteed parametric performance - meets automotive functional safety baseline requirements |
| Low-voltage operation | Guaranteed RESET assertion and timing down to VCC = 1.2V - enables supervision of ultra-low-power MCUs in sleep mode |
Applications
| Automotive Engine Control Unit | Medical Infusion Pump |
|---|---|
|
Use Scenario: Real-time monitoring of 5V main supply and 3.3V MCU core rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET within 20µs of VCC drop below 4.625V or RESET IN drop below 1.235V, holding for 7.6ms. Use Value: Prevents corrupted flash writes and state-machine lockup during 12V battery sag to 6V, meeting ISO 16750-2 pulse 4a requirements. |
Use Scenario: Ensuring safe restart after power interruption in battery-powered infusion controller with ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Push-pull RESET output directly drives MCU reset pin; 3.7µA supply current extends 2-year battery life; MR pin enables nurse-initiated recalibration reset. Use Value: Eliminates external pull-up resistor and reduces BOM count while maintaining IEC 60601-1 leakage current compliance. |
| Industrial PLC I/O Module | Smart Energy Meter |
|
Use Scenario: Supervising isolated 3.3V logic supply and 24V field-side auxiliary rail in DIN-rail mounted controller. IC Role / Device Role / Timing Role: RESET IN pin monitors divided 24V rail at 1.235V threshold; VCC monitors local 3.3V; WDS pin enables extended watchdog for Modbus RTU polling cycles. Use Value: Single-chip dual-rail supervision replaces discrete resistor-divider + comparator solution, reducing footprint by 42%. |
Use Scenario: Brownout protection during grid voltage sags in Class 0.2S revenue-grade meter with dual-core metrology SoC. IC Role / Device Role / Timing Role: Factory-trimmed 4.625V VCC threshold detects AC/DC converter dropout; capacitor-adjustable 7.6ms tRP matches SoC power-up sequence. Use Value: ±2% threshold tolerance ensures no false resets during 10% nominal voltage variation (207–253V AC), satisfying IEC 62053-22. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA46+T | Same 4.625V VCC threshold and dual-supply monitoring, but lacks manual-reset (MR) input | Suitable where external reset initiation is unnecessary; identical pinout and timing | Select MAX6750KA46+T only if MR functionality is unused - saves no cost but removes one PCB trace |
| TPS3808G33DBVR | Fixed 3.3V reset threshold only; no adjustable RESET IN input; 1.6µA ICC vs. 3.7µA; no WDS extend mode | Limited to single-rail 3.3V systems; requires external circuitry for dual-voltage or extended watchdog needs | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only designs where dual monitoring and watchdog flexibility are not required |
Compared with MAX6750KA46+T, the MAX6751KA46+T adds MR functionality without altering timing, package, or supply specs - making it the preferred choice when operator-initiated reset is needed. Versus TPS3808G33DBVR, MAX6751KA46+T delivers broader voltage coverage, dual-rail capability, and programmable watchdog extension at higher quiescent current - justifying its use in safety-critical multi-rail systems.
Availability
MAX6751KA46+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLC I/O modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6751KA46+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, serving industrial, automotive, communications, and healthcare markets with precision sensing and power management solutions.
The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, emphasizing AEC-Q100 qualification, ultra-low power, dual-voltage monitoring, and capacitor-programmable timing - addressing reliability gaps in legacy reset ICs.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6751KA46+T?
The MAX6751KA46+T has a factory-trimmed VCC reset threshold of 4.625V ±2% (minimum 4.533V, maximum 4.718V) across –40°C to +125°C. This value is confirmed in Table 2 of the datasheet under suffix "46", and applies specifically to the VCC supply monitoring function - independent of the adjustable 1.235V RESET IN threshold.
Does MAX6751KA46+T support manual reset functionality?
Yes, MAX6751KA46+T includes a dedicated MR (manual-reset) input on Pin 8. It is internally pulled up to VCC, requires no external components, and asserts RESET for the full timeout period when held low for ≥1µs. This feature is explicitly listed in the Selector Guide for MAX6751 and verified in the Pin Descriptions section.
How is the watchdog timeout extended by 128× on MAX6751KA46+T?
The MAX6751KA46+T uses the WDS (Watchdog Select) pin (Pin 7) to enable 128× watchdog extension: connecting WDS to VCC selects extended mode, while grounding it selects normal mode. A state change on WDS clears the watchdog timer - a behavior documented in the Pin Descriptions and Watchdog Timer sections of the datasheet.
What package type and dimensions does MAX6751KA46+T use?
MAX6751KA46+T is supplied in an 8-pin SOT23 package (outline number 21-0078), with body dimensions of 2.9mm × 1.6mm × 1.1mm and lead pitch of 0.65mm. The land pattern number is 90-0176, and thermal resistance is θJA = 196°C/W on a four-layer board - all confirmed in the Package Information section.
Can MAX6751KA46+T monitor two different supply voltages simultaneously?
Yes, MAX6751KA46+T performs true dual-voltage monitoring: it uses its internal 4.625V comparator for VCC and the RESET IN pin (Pin 1) to monitor an external voltage via a resistor divider referenced to the 1.235V internal threshold. This capability is explicitly stated in the General Description and confirmed in the Selector Guide for MAX6751.
MAX6751KA46+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:
- 4.625V, 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
MAX6751KA46+T FAQ
1.How can I place an order for MAX6751KA46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA46+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 MAX6751KA46+T reliable?
The price and inventory of MAX6751KA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA46+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA46+T?
MAX6751KA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA46+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 MAX6751KA46+T?
For technical support, including MAX6751KA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA46+T requirements.
6.How does Aetrix verify that MAX6751KA46+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA46+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 MAX6751KA46+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA46+T?
All MAX6751KA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA46+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 MAX6751KA46+T part is unused and in its original packaging.
Return procedure for MAX6751KA46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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