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Analog Devices Inc./Maxim Integrated MAX6751KA26+T
- Part No.:
- MAX6751KA26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA26+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,204
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Product details
Overview
MAX6751KA26+T from Analog Devices is a low-power microprocessor supervisory IC with dual-voltage monitoring (VCC and RESET IN), factory-trimmed 2.625V ±2% reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), watchdog select input (WDS) for 128× extended timeout mode, and AEC-Q100 qualified operation from –40°C to +125°C - used in automotive engine control units to ensure deterministic μP reset during cold-crank brownout events.
For engineers reviewing the MAX6751KA26+T datasheet, MAX6751KA26+T pinout, MAX6751KA26+T application, or MAX6751KA26+T equivalent, this page delivers verified specifications, automotive-grade thermal and transient immunity data, SOT23-8 pin mapping, and two validated alternative parts with documented functional and timing differences for critical embedded reset design.
Technical Context
The MAX6751KA26+T implements dual-supply supervision: one path monitors VCC against a factory-trimmed 2.625V threshold (±2% over –40°C to +125°C), while the second monitors an external voltage via RESET IN with 1.235V ±0.019V adjustable comparator threshold. It features independent capacitor-programmable reset timeout (tRP = 4.94×10⁶ × CSRT) and watchdog timeout (tWD = 4.94×10⁶ × CSWT), plus WDS-controlled 128× watchdog extension.
Its push-pull RESET output guarantees valid logic state down to VCC ≥ 1.0V, supports manual reset via MR input with 1μs minimum pulse width and 100ns glitch rejection, and provides power-supply transient immunity up to 50μs at 100mV overdrive - enabling robust operation in noisy automotive 12V battery systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.625V ±2% (factory-trimmed, guaranteed over –40°C to +125°C) |
| Supply Voltage Range | 1.2V to 5.5V - supports 1.8V/2.5V/3.3V/5V μP rails and cold-crank operation |
| Quiescent Current | 3.7µA at VCC ≤ 2.0V - enables >10-year battery life in always-on vehicle modules |
| Reset Timeout Period | 5.69–9.49ms (with CSRT = 1500pF) - configurable from 0.5ms to >100ms via capacitor |
| Watchdog Timeout (Normal) | 5.69–9.49ms (CSWT = 1500pF); extends to 729–1214ms when WDS = VCC |
| RESET Output Type | Push-pull active-low - eliminates external pull-up, ensures defined state at VCC ≥ 1.0V |
| Operating Temperature | –40°C to +125°C (AEC-Q100 Grade 0 qualified) - certified for under-hood automotive use |
Pinout & Package
MAX6751KA26+T is housed in an 8-pin SOT23 package (Outline 21-0078, RoHS-compliant), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W on 4-layer board - optimized for space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | Monitors external supply (e.g., 5V rail) via resistor divider; threshold = 1.235V ±0.019V |
| 2 - WDS | Watchdog select input | Ground = normal mode; VCC = 128× extended timeout; change clears watchdog timer |
| 3 - SWT | Watchdog timeout capacitor terminal | Connect CSWT to GND; sets tWD = 4.94×10⁶ × CSWT (s/F); short to GND disables watchdog |
| 4 - SRT | Reset timeout capacitor terminal | Connect CSRT to GND; sets tRP = 4.94×10⁶ × CSRT (s/F); determines reset assertion duration |
| 5 - GND | Power ground reference | Common return for all analog/digital circuitry; must be low-impedance connection to system ground plane |
| 6 - WDI | Watchdog input | Falling edge resets watchdog timer; must not float; 300ns minimum pulse width accepted |
| 7 - RESET | Active-low reset output | Push-pull driver; asserts low during VCC/RESET IN undervoltage or watchdog fault; holds for tRP |
| 8 - VCC | Supply voltage input | Primary power rail (1.2–5.5V); also monitored by internal 2.625V ±2% comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.625V ±2%) and external rail via RESET IN (1.235V ±0.019V) |
| Capacitor-adjustable timing | Independent CSRT and CSWT capacitors set reset and watchdog timeouts without firmware or trimming |
| 128× watchdog extension | WDS pin toggles between normal and extended modes - avoids need for larger timing capacitors |
| Automotive-grade reliability | AEC-Q100 qualified, –40°C to +125°C operation, and 50μs transient immunity at 100mV overdrive |
| Low-power reset assurance | 3.7µA ICC at 2.0V enables always-on monitoring in battery-backed ECUs without significant drain |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Cold-crank battery dip to 6.2V with high dV/dt transients during engine start. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RESET until both 5V logic rail and 12V analog rail stabilize above thresholds. Use Value: Prevents μP code execution during unstable power; 50μs transient immunity avoids spurious resets from starter motor noise. |
Use Scenario: Battery-powered portable infusion pump requiring fail-safe restart after power interruption. IC Role / Device Role / Timing Role: Monitors main Li-ion supply (3.3V) and backup coin cell (3.0V) with independent thresholds and watchdog. Use Value: Guarantees deterministic reset within 9.5ms and prevents runaway motor operation via 128× extended watchdog timeout. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
Use Scenario: 24V industrial bus with ESD-induced voltage sags on isolated 3.3V logic domain. IC Role / Device Role / Timing Role: Supervises isolated 3.3V rail using RESET IN; uses VCC monitoring for local 5V supply. Use Value: Push-pull RESET ensures clean reset signal without external pull-up, reducing BOM count and layout complexity. |
Use Scenario: Cellular-connected TCU powered by vehicle battery with frequent sleep/wake cycles. IC Role / Device Role / Timing Role: Provides low-current (3.7µA) reset supervision and programmable watchdog to detect firmware hangs during LTE handover. Use Value: Enables >5-year battery-backed operation in always-connected mode while maintaining ASIL-B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA26+T | Same 2.625V VCC threshold, but includes manual-reset input (MR); no WDS pin | Requires external MR switch; lacks 128× watchdog extension capability | Select when manual reset is mandatory and extended watchdog timeout is unnecessary |
| TLV809EA26DBZR | Single-supply only (2.63V ±1%), no adjustable RESET IN, no watchdog, 1.8µA ICC | No dual-monitoring or watchdog functionality; suitable only for basic reset-only applications | Select for cost-sensitive, non-automotive designs where watchdog and dual-rail monitoring are omitted |
Compared with MAX6751KA26+T, MAX6750KA26+T adds manual reset but removes watchdog extension, while TLV809EA26DBZR reduces cost and current but sacrifices dual monitoring, watchdog, and automotive qualification - making MAX6751KA26+T the only choice for AEC-Q100-compliant dual-rail systems requiring programmable extended watchdog timing.
Availability
MAX6751KA26+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLC I/O modules, and telematics control units requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX6751KA26+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 automotive, industrial, and healthcare markets with precision timing and power management solutions.
The MAX6746–MAX6753 product line delivers AEC-Q100-qualified microprocessor supervisors with dual-voltage monitoring, capacitor-adjustable timing, and extended watchdog modes - engineered specifically for automotive and mission-critical embedded systems demanding robust power-on reset and fault detection.
FAQ
What is the exact reset threshold voltage of the MAX6751KA26+T?
The MAX6751KA26+T features a factory-trimmed VCC reset threshold of 2.625V with ±2% tolerance over the full –40°C to +125°C automotive temperature range. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" and corresponds to suffix "26" in the ordering code per Table 2 of the datasheet. The MAX6751KA26+T does not use external resistors to set this threshold - it is laser-trimmed during production.
Does the MAX6751KA26+T support monitoring two independent supply rails simultaneously?
Yes, the MAX6751KA26+T supports true dual-voltage monitoring: its VCC pin is monitored against the fixed 2.625V threshold, while the RESET IN pin monitors an external voltage using a precision 1.235V ±0.019V comparator. When either voltage falls below its respective threshold, RESET asserts. This capability is explicitly enabled in the MAX6751 variant per the Selector Guide and is distinct from single-rail parts like MAX6746.
How is the watchdog timeout extended by 128× on the MAX6751KA26+T?
The MAX6751KA26+T achieves 128× watchdog extension via the WDS (Watchdog Select) pin: when pulled high to VCC, the internal watchdog timer multiplies the base timeout (set by CSWT) by 128. For example, with CSWT = 1500pF, normal mode yields ~7.6ms, while WDS = VCC extends it to ~971ms. This behavior is documented in the Pin Descriptions and Watchdog Timer sections, and WDS state changes clear the watchdog counter.
Is the MAX6751KA26+T compatible with 1.8V microcontrollers?
Yes, the MAX6751KA26+T operates with VCC as low as 1.2V and guarantees valid push-pull RESET output down to VCC ≥ 1.0V. Its 3.7µA supply current at VCC ≤ 2.0V and logic-compatible inputs (VIH = 0.7×VCC, VIL = 0.3×VCC) ensure seamless interfacing with 1.8V μPs. The RESET output VOH reaches 0.8×VCC at ISOURCE = 200µA, meeting standard 1.8V CMOS high-level requirements.
What package type and footprint does the MAX6751KA26+T use?
The MAX6751KA26+T uses an 8-pin SOT23 package (Outline Number 21-0078, Land Pattern 90-0176), measuring 2.9mm × 1.6mm with 0.65mm lead pitch. This RoHS-compliant package is specified for reflow soldering at +260°C and supports JEDEC-standard thermal performance (θJA = 196°C/W on 4-layer board). Footprint details are published at maximintegrated.com/packages.
MAX6751KA26+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:
- 2.625V, 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
MAX6751KA26+T FAQ
1.How can I place an order for MAX6751KA26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA26+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 MAX6751KA26+T reliable?
The price and inventory of MAX6751KA26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA26+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA26+T?
MAX6751KA26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA26+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 MAX6751KA26+T?
For technical support, including MAX6751KA26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA26+T requirements.
6.How does Aetrix verify that MAX6751KA26+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA26+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 MAX6751KA26+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA26+T?
All MAX6751KA26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA26+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 MAX6751KA26+T part is unused and in its original packaging.
Return procedure for MAX6751KA26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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