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Analog Devices Inc./Maxim Integrated MAX6751KA29+TCLC
- Part No.:
- MAX6751KA29+TCLC
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA29+TCLC.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,149
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Product details
Overview
MAX6751KA29+TCLC from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.925V VCC reset threshold (±2%), capacitor-adjustable 5.7–9.5ms reset timeout, and extended-mode watchdog timeout up to 1214ms. It monitors dual supply voltages (VCC and external RESET IN), features manual-reset input, and delivers push-pull active-low RESET output in automotive-grade 8-pin SOT23 package for embedded controller brownout protection.
For engineers reviewing the MAX6751KA29+TCLC datasheet, MAX6751KA29+TCLC pinout, MAX6751KA29+TCLC application, or MAX6751KA29+TCLC equivalent, key selection criteria include dual-voltage monitoring capability, AEC-Q100 qualification, ±2% reset threshold accuracy over -40°C to +125°C, adjustable watchdog via WDS pin, and guaranteed RESET validity down to VCC ≥ 1V.
Technical Context
The MAX6751KA29+TCLC implements dual-supply supervision: a fixed 2.925V threshold for VCC (±2% over -40°C to +125°C) and an adjustable 1.235V threshold for external RESET IN voltage monitoring via resistor divider. Its reset assertion is immune to transients ≤50µs at 100mV overdrive.
It integrates a capacitor-adjustable watchdog timer with selectable normal/extended modes via WDS pin - extending timeout by 128× - and supports manual reset via internally pulled-up MR input with 1µs minimum pulse width and 100ns glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±2% (factory-trimmed; ensures reliable brownout detection at nominal 2.9V rail) |
| RESET Timeout | 5.692–9.487ms (set by CSRT = 1500pF; meets typical µP power-up sequencing requirements) |
| Watchdog Timeout | 5.692–9.487ms (normal mode) or 728.6–1214.4ms (extended mode); configurable via CSWT and WDS pin |
| Supply Current | 3.7–10µA (ultra-low quiescent current enables battery-powered operation >10 years) |
| Operating Temp | -40°C to +125°C (AEC-Q100 qualified; validated for under-hood automotive use) |
| RESET Output | Push-pull active-low; VOL ≤0.3V @ ISINK = 50µA; VOH ≥0.8×VCC @ ISOURCE = 200µA |
| RESET IN Threshold | 1.235V ±19mV; enables precise monitoring of secondary supply or I/O rail |
Pinout & Package
MAX6751KA29+TCLC is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 1.9mm × 2.8mm footprint and 0.95mm height - optimized for space-constrained automotive and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | Accepts external resistor-divider to monitor secondary voltage (e.g., 3.3V I/O rail); threshold = 1.235V |
| 2 - WDS | Watchdog select control | Ground = normal watchdog mode; VCC = 128× extended timeout; state change clears watchdog timer |
| 3 - SWT | Watchdog timeout capacitor node | Connect CSWT to GND; tWD = 4.94×10⁶ × CSWT (s); short to GND disables watchdog |
| 4 - SRT | Reset timeout capacitor node | Connect CSRT to GND; tRP = 4.94×10⁶ × CSRT (s); sets deassertion hold time after VCC recovery |
| 5 - GND | Power ground reference | Common return for all analog/digital functions; requires low-impedance PCB connection |
| 6 - WDI | Watchdog input | Falling edge resets watchdog timer; must not float; 300ns minimum pulse width supported |
| 7 - RESET | Active-low reset output | Push-pull driver; asserts low on VCC/RESET IN undervoltage or MR activation; holds for tRP |
| 8 - VCC | Main supply input | Operates from 1.2V to 5.5V; powers internal circuitry and serves as monitored rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.925V ±2%) and external rail via RESET IN (1.235V ±19mV) |
| Capacitor-adjustable timing | Independent reset (SRT) and watchdog (SWT) timeouts set with standard ceramic capacitors |
| Extended watchdog mode | WDS pin multiplies basic timeout by 128× - enabling >1-second fault detection without large capacitors |
| Transient-immune reset | Guaranteed no false reset for VCC glitches ≤50µs at 100mV below threshold |
| AEC-Q100 qualification | Validated for automotive applications across full -40°C to +125°C junction temperature range |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 2.9V microcontroller supply and 1.2V sensor bias rail during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RESET if either rail drops below threshold; provides 7.6ms reset hold to ensure clean µP boot. Use Value: Prevents erratic ECU behavior during battery voltage sag; eliminates need for discrete comparators and RC timers. | Use Scenario: Ensures safe restart of ARM-based pump controller after power interruption or software hang. IC Role / Device Role / Timing Role: Provides watchdog-triggered reset with 1214ms extended timeout, allowing full motor homing sequence before fault assertion. Use Value: Meets IEC 62304 Class C safety requirements by guaranteeing fail-safe shutdown within defined window. |
| Industrial PLC I/O Module | Portable Test Equipment |
Use Scenario: Supervises 3.3V FPGA configuration rail and 2.5V ADC reference supply in harsh factory environments. IC Role / Device Role / Timing Role: Uses RESET IN pin to track ADC reference; asserts RESET if reference drifts beyond ±1.5%, preventing measurement corruption. Use Value: Eliminates field failures due to undetected analog supply degradation; reduces calibration frequency. | Use Scenario: Powers on/off management for handheld oscilloscope with Li-ion battery and 2.9V core rail. IC Role / Device Role / Timing Role: Delivers 3.7µA supply current and valid RESET down to VCC = 1V, extending battery life while ensuring deterministic boot. Use Value: Enables >500-hour standby without supervision-induced drain; meets UL 61010-1 leakage limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA29+TCLC | Same 2.925V VCC threshold and dual-monitoring architecture, but lacks manual-reset input (MR) | Suitable where system-level reset initiation is handled externally; no board-level switch support | Select when manual reset is unnecessary and BOM consolidation with MAX6751 is desired |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no adjustable RESET IN input; 35µA ICC (vs. 3.7µA); no extended watchdog mode | Better suited for single-rail 3.3V systems without secondary voltage monitoring or long watchdog windows | Choose for cost-sensitive industrial applications where 3.3V-only supervision suffices and ultra-low ICC is noncritical |
Compared with MAX6750KA29+TCLC, MAX6751KA29+TCLC adds MR functionality for operator-initiated recovery; versus TPS3808G33DBVR, it offers dual-rail monitoring, 10× lower supply current, and 128× extended watchdog - critical for battery-powered or safety-critical dual-supply systems.
Availability
MAX6751KA29+TCLC is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLC modules, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6751KA29+TCLC 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 precision instrumentation, automotive, industrial, and healthcare markets.
The MAX6746–MAX6753 family was designed specifically for robust, low-power microprocessor supervision in automotive and safety-critical embedded systems - emphasizing AEC-Q100 compliance, transient immunity, and flexible dual-rail monitoring.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6751KA29+TCLC?
The MAX6751KA29+TCLC has a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance over -40°C to +125°C, as confirmed by the "29" suffix in its part number and Table 2 of the datasheet. This value applies exclusively to the VCC supply monitoring path; the RESET IN input maintains a separate 1.235V threshold for external rail supervision. The MAX6751KA29+TCLC uses this precise threshold to detect brownout conditions on 2.9V microcontroller rails without external resistor networks.
Does MAX6751KA29+TCLC support dual-voltage monitoring, and how is it implemented?
Yes, MAX6751KA29+TCLC supports dual-voltage monitoring by combining its factory-trimmed 2.925V VCC threshold with an adjustable 1.235V threshold on the RESET IN pin. The RESET IN pin connects to a resistor divider across a secondary supply (e.g., 3.3V or 5V rail), enabling independent supervision of two distinct voltage domains. RESET asserts if either VCC falls below 2.925V or the divided voltage at RESET IN drops below 1.235V. This dual-path architecture is explicitly documented in the Selector Guide and Detailed Description sections for MAX6751KA29+TCLC.
How is the watchdog timeout extended in MAX6751KA29+TCLC, and what is the maximum timeout achievable?
The MAX6751KA29+TCLC extends watchdog timeout using the WDS pin: connecting WDS to VCC multiplies the base timeout (set by CSWT) by 128×. With CSWT = 1500pF, the extended timeout reaches 728.6–1214.4ms (typical 971.5ms). This 128× extension is exclusive to MAX6746–MAX6751 variants and is confirmed in the Pin Descriptions and Watchdog Timer sections. The MAX6751KA29+TCLC leverages this feature to support long software execution cycles without requiring physically large timing capacitors.
What package type and footprint does MAX6751KA29+TCLC use, and is it RoHS-compliant?
MAX6751KA29+TCLC uses an 8-pin SOT23 package (outline number 21-0078, land pattern 90-0176), measuring 1.9mm × 2.8mm with 0.95mm height. The "+" in the part number suffix indicates RoHS compliance per EU Directive 2011/65/EU. This compact, surface-mount package supports automated assembly and meets thermal requirements for automotive under-hood placement, with junction-to-ambient thermal resistance of 196°C/W on a four-layer board.
Is MAX6751KA29+TCLC qualified for automotive applications, and what is its temperature rating?
Yes, MAX6751KA29+TCLC is AEC-Q100 qualified Grade 0 (−40°C to +125°C ambient) and fully specified across this automotive temperature range. Its electrical characteristics - including reset threshold accuracy, supply current, and timing parameters - are guaranteed over −40°C to +125°C, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. This qualification makes MAX6751KA29+TCLC suitable for engine control, transmission, and ADAS modules where reliability under thermal stress is mandatory.
MAX6751KA29+TCLC 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:
- 2.925V, 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
MAX6751KA29+TCLC FAQ
1.How can I place an order for MAX6751KA29+TCLC through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA29+TCLC 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 MAX6751KA29+TCLC reliable?
The price and inventory of MAX6751KA29+TCLC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA29+TCLC is usually 5 days.
3.What payment methods are accepted for MAX6751KA29+TCLC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA29+TCLC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA29+TCLC?
MAX6751KA29+TCLC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA29+TCLC 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 MAX6751KA29+TCLC?
For technical support, including MAX6751KA29+TCLC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA29+TCLC requirements.
6.How does Aetrix verify that MAX6751KA29+TCLC is sourced from the original manufacturer or authorized distributors?
All MAX6751KA29+TCLC 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 MAX6751KA29+TCLC meets industry standards.
7.What is the process for return or replacement of MAX6751KA29+TCLC?
All MAX6751KA29+TCLC units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA29+TCLC, 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 MAX6751KA29+TCLC part is unused and in its original packaging.
Return procedure for MAX6751KA29+TCLC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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