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Analog Devices Inc./Maxim Integrated MAX6381XR29D2+T
- Part No.:
- MAX6381XR29D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR29D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,121
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Product details
Overview
MAX6381XR29D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring a factory-set 2.93V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and active-low push-pull reset output. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered microcontroller power-up sequencing in portable instrumentation.
For engineers reviewing the MAX6381XR29D2+T datasheet, MAX6381XR29D2+T pinout, MAX6381XR29D2+T application, or MAX6381XR29D2+T equivalent, key selection criteria include its fixed 2.93V threshold accuracy, 20ms timeout timing, SC70 footprint compatibility with legacy MAX809/MAX810, and guaranteed operation at VCC ≥ 1V for brownout resilience in embedded control systems.
Technical Context
The MAX6381XR29D2+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco, paired with a monolithic RC timer for deterministic 20ms reset assertion after VCC recovery. Its push-pull active-low RESET output drives directly into μP reset inputs without external pullup.
No manual reset (MR) or auxiliary RESET IN inputs are present - this variant belongs to the base MAX6381 series (not MAX6384–MAX6390 or MAX6387–MAX6389), confirming single-supply monitoring only, with no debounced MR capability or dual-voltage detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (2.85V min / 3.00V max at +25°C); ±2.5% tolerance over full temperature range ensures reliable brownout detection in industrial environments. |
| Reset Timeout | 20ms minimum; provides sufficient hold time for microcontroller core initialization before release of reset signal. |
| Supply Current | 3μA at +1.8V; enables multi-year battery life in always-on portable sensors and IoT edge nodes. |
| Operating Voltage | +1.0V to +5.5V; supports valid reset assertion even during deep brownout down to 1V, critical for fail-safe system recovery. |
| Output Type | Active-low push-pull; eliminates need for external pullup resistor and ensures fast, low-impedance reset deassertion. |
| Package | 3-pin SC70 (X3+2 outline); ultra-compact footprint compatible with space-constrained PCB layouts in handheld devices. |
| Temperature Range | -40°C to +125°C; qualified for automotive under-hood and industrial control applications requiring extended thermal robustness. |
Pinout & Package
MAX6381XR29D2+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not electrically connected. Pin 1 is RESET (active-low push-pull), Pin 2 is VCC, and Pin 3 is GND - no NC pins or auxiliary functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output; asserts low when VCC < 2.93V and holds for ≥20ms after VCC exceeds threshold - directly interfaces μP reset input without external components. |
| 2 | VCC | Main supply input and monitored voltage source; accepts +1.0V to +5.5V; powers internal comparator and timer; valid reset operation guaranteed down to 1V. |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to ensure accurate threshold comparison and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±2.5% accuracy over -40°C to +125°C eliminates need for external calibration in production test. |
| Ultra-low quiescent current | 3μA at +1.8V enables integration into energy-harvesting and coin-cell-powered systems without compromising battery lifetime. |
| Deterministic reset timing | 20ms minimum timeout ensures consistent μP boot sequence across voltage ramps and temperature extremes. |
| Valid reset at low VCC | Guaranteed correct logic state down to VCC = 1V prevents spurious resets during severe brownout conditions. |
| SC70 footprint compatibility | Pins match industry-standard MAX809/MAX810, enabling drop-in replacement in existing designs without layout changes. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG sensor operating from a 3.0V lithium coin cell with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervises VCC during sleep-to-wake transitions; asserts reset if voltage sags below 2.93V during RF transmission burst. Use Value: 3μA supply current extends battery life beyond 3 years; 20ms timeout ensures clean MCU restart without firmware lockup. | Use Scenario: DIN-rail mounted analog input module powered by 24VDC converted to 3.3V, subject to field wiring transients. IC Role / Device Role / Timing Role: Monitors 3.3V rail for brownout events caused by shared power bus disturbances; triggers hard reset on µC upon undervoltage. Use Value: ±2.5% threshold accuracy prevents false resets during normal 3.3V ripple; -40°C to +125°C rating supports uncooled cabinet deployment. |
| Automotive Body Control Units | Smart Home Hub Power Management |
Use Scenario: 12V automotive subsystem with LDO-regulated 3.3V domain powering CAN controller and EEPROM. IC Role / Device Role / Timing Role: Detects battery voltage drop during cold-cranking (e.g., 9V → 6V transient); holds reset until stable 3.3V resumes and 20ms timeout expires. Use Value: Valid operation down to VCC = 1V ensures reset remains asserted through worst-case cranking dips; AEC-Q100-compatible variant available. | Use Scenario: Wi-Fi-connected thermostat using 5V USB power with internal 1.8V/3.3V regulators for SoC and peripherals. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V domain; coordinates safe shutdown and restart during AC adapter disconnect/reconnect events. Use Value: Push-pull output drives reset net directly - no pullup required - reducing BOM count and board area in cost-sensitive consumer designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | Same 3-pin SC70 package, 2.93V threshold, but 240ms timeout (not 20ms); higher 12μA ICC at +3.6V. | Lacks short 20ms timing option; better suited for systems needing longer reset hold during slow power ramp. | Select MAX809TRD2+T only if longer timeout is acceptable and higher current draw is tolerable. |
| TPS3808G18DBVR | 2.93V threshold, 20ms timeout, but SOT-23-5 package with enable pin; 1.8μA ICC at +1.8V. | Requires external enable control; adds flexibility but increases routing complexity vs. 3-pin simplicity of MAX6381XR29D2+T. | Choose TPS3808G18DBVR when system-level power sequencing requires gated reset activation. |
Compared with MAX809TRD2+T and TPS3808G18DBVR, MAX6381XR29D2+T uniquely delivers 20ms timing in a minimal 3-pin SC70 footprint with ultra-low 3μA current - optimizing for compact, battery-sensitive designs where pin count and power are primary constraints.
Availability
MAX6381XR29D2+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6381XR29D2+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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on high reliability and low power.
The MAX6381–MAX6390 family targets microprocessor supervisory functions in space- and power-constrained systems, delivering factory-trimmed voltage monitoring with guaranteed timing and wide temperature operation.
FAQ
What is the exact reset threshold voltage of MAX6381XR29D2+T and how stable is it over temperature?
The MAX6381XR29D2+T has a nominal reset threshold of 2.93V, with a minimum of 2.85V and maximum of 3.00V at +25°C. Over the full operating range of -40°C to +125°C, the threshold maintains ±2.5% accuracy - meaning it stays within 2.85V to 3.00V across temperature. This stability is achieved via precision bandgap referencing and laser trimming, ensuring reliable brownout detection without external calibration. The MAX6381XR29D2+T's 60ppm/°C tempco further minimizes drift in demanding thermal environments.
Does MAX6381XR29D2+T support manual reset functionality?
No, MAX6381XR29D2+T does not include a manual reset (MR) input. It belongs to the base MAX6381 series, which features only VCC monitoring and an active-low push-pull RESET output. Manual reset capability is exclusive to variants like MAX6384, MAX6385, MAX6386, and MAX6390 - all of which use 4-pin SC70 or 6-pin μDFN packages. The MAX6381XR29D2+T's 3-pin SC70 configuration physically lacks the MR pin, and its internal circuitry omits the debounced input path and pullup resistor found in MR-enabled versions.
What is the minimum supply voltage at which MAX6381XR29D2+T guarantees correct reset output behavior?
The MAX6381XR29D2+T guarantees valid reset output logic state down to VCC = 1.0V - meaning the RESET pin will correctly assert low when VCC falls below 2.93V and remain asserted for the full 20ms timeout, even as VCC drops to 1V. This is explicitly specified in the Electrical Characteristics table and confirmed in the "Ensuring a Valid RESET Output Down to VCC = 0V" section. While operation ceases below 1V, the MAX6381XR29D2+T's design ensures fail-safe behavior through deep brownout, making it suitable for applications with unstable or decaying power sources.
Can MAX6381XR29D2+T be used in automotive applications?
Yes, MAX6381XR29D2+T is AEC-Q100 qualified for automotive use, as noted in the Features section and Ordering Information. Its -40°C to +125°C operating temperature range, ±2.5% threshold accuracy over that range, and robust transient immunity meet requirements for body electronics and infotainment power supervision. While the base MAX6381XR29D2+T is lead-free/RoHS-compliant (+T suffix), automotive-grade versions carry the /V suffix (e.g., MAX6381XR29D2/V+T) - both share identical electrical specs and 3-pin SC70 packaging, differing only in qualification documentation and traceability.
Is MAX6381XR29D2+T pin-compatible with older Maxim reset supervisors like MAX809?
Yes, MAX6381XR29D2+T is pin-compatible with MAX809/MAX810 in the 3-pin SC70 package - sharing identical pin 1 (RESET), pin 2 (VCC), and pin 3 (GND) assignments and electrical behavior. The datasheet explicitly states "Pin Compatible with MAX809/MAX810…" and confirms matching SC70 footprints (outline 21-0075). However, note that MAX809 variants typically offer different timeout options (e.g., 240ms), so while physical replacement is direct, timing behavior must be verified against system requirements before substitution. The MAX6381XR29D2+T retains full functional interoperability in existing MAX809 layouts.
MAX6381XR29D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR29D2+T FAQ
1.How can I place an order for MAX6381XR29D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR29D2+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 MAX6381XR29D2+T reliable?
The price and inventory of MAX6381XR29D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR29D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR29D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR29D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR29D2+T?
MAX6381XR29D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR29D2+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 MAX6381XR29D2+T?
For technical support, including MAX6381XR29D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR29D2+T requirements.
6.How does Aetrix verify that MAX6381XR29D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR29D2+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 MAX6381XR29D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR29D2+T?
All MAX6381XR29D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR29D2+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 MAX6381XR29D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR29D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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