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Analog Devices Inc./Maxim Integrated MAX6381XR29D3+T
- Part No.:
- MAX6381XR29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR29D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.93V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,877
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Product details
Overview
MAX6381XR29D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 2.93V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors single supply voltage down to +1.8V with only 3μA supply current at 1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered embedded controllers requiring reliable brownout protection.
For engineers reviewing the MAX6381XR29D3+T datasheet, MAX6381XR29D3+T pinout, MAX6381XR29D3+T application, or MAX6381XR29D3+T equivalent, key selection considerations include its open-drain reset architecture, 2.93V threshold tolerance, 140ms timeout timing, and compatibility with dual-voltage monitoring systems when paired with external resistor dividers.
Technical Context
The MAX6381XR29D3+T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC recovers above 2.93V, independent of supply ramp rate.
This variant belongs to the MAX6381–MAX6390 family's open-drain active-low subgroup (MAX6383/MAX6386/MAX6389/MAX6390) and lacks manual reset (MR) or auxiliary RESET IN inputs - confirming it is a dedicated single-supply monitor with minimal external components required.
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 robust brownout detection in industrial environments. |
| VCC Operating Range | 1.0V to 5.5V; enables operation during deep brownout and supports wide-input power rails including Li-ion battery-backed systems. |
| Reset Timeout | 140ms minimum (D3 suffix); guarantees μP remains held in reset long enough for stable clock and supply settling before code execution resumes. |
| Supply Current | 3μA at +1.8V; ultra-low quiescent draw extends battery life in portable instrumentation and remote sensors. |
| Reset Output Type | Active-low open-drain; requires external pullup but allows wired-OR configuration and level translation across mixed-voltage domains. |
| Reset Valid Down To | VCC = 1.0V; ensures deterministic reset logic state even during severe undervoltage conditions where many competitors fail. |
| Temperature Range | -40°C to +125°C; qualified for automotive under-hood and industrial control applications without derating. |
Pinout & Package
MAX6381XR29D3+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm. Pin 1 is RESET (active-low open-drain), Pin 2 is VCC, and Pin 3 is GND. No internal connections exist for MR or RESET IN - all unused pins are omitted in this 3-pin variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low reset output | Drives low to assert reset; requires external pullup resistor (typically 10kΩ–100kΩ) to host VDD; compatible with 1.8V–5V logic domains. |
| 2: VCC | Power supply input and monitored voltage rail | Both powers the IC and serves as primary reset trigger source; accepts 1.0V–5.5V with no external components needed for basic operation. |
| 3: GND | Ground reference | Common return path for internal comparator and output stage; must be low-impedance connection to avoid noise-induced false resets. |
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 resistor divider calibration. |
| Ultra-low supply current | 3μA at 1.8V enables multi-year operation on coin cells in IoT endpoint devices and portable medical sensors. |
| Guaranteed reset validity | RESET output remains logically valid down to VCC = 1.0V - critical for fail-safe behavior during catastrophic supply collapse. |
| Negative-going transient immunity | Rejects VCC glitches ≤100µs duration when overdrive exceeds 100mV, reducing susceptibility to EMI-induced spurious resets. |
| Small-footprint packaging | 3-pin SC70 (2.0mm × 2.1mm) saves PCB area in space-constrained modules like wearables and smart meters. |
Applications
| Industrial PLC I/O Module | Battery-Powered Data Logger |
|---|---|
|
Use Scenario: Monitors 3.3V I/O supply in programmable logic controller modules exposed to wide ambient temperatures and electrical noise. IC Role / Device Role / Timing Role: Single-supply supervisor asserting active-low reset to ARM Cortex-M7 MCU during brownout or cold-start conditions. Use Value: 2.93V threshold matches typical 3.3V LDO dropout margin; 140ms timeout exceeds worst-case clock stabilization time; open-drain output interfaces cleanly with 3.3V FPGA reset input. |
Use Scenario: Powers sensor node with CR2032 coin cell and low-quiescent LDO, requiring >5-year shelf life and reliable wake-from-deep-sleep reset. IC Role / Device Role / Timing Role: Primary reset generator ensuring microcontroller initializes correctly after battery insertion or voltage recovery. Use Value: 3μA ICC at 1.8V minimizes standby drain; 2.93V threshold prevents premature reset release during weak battery discharge; SC70 footprint fits sub-10mm² PCB area budget. |
| Automotive Body Control Unit | Dual-Voltage Microcontroller System |
|
Use Scenario: Supervises 5V system rail in AEC-Q100-compliant body electronics module operating from -40°C to +125°C. IC Role / Device Role / Timing Role: Dedicated VCC monitor providing fail-safe reset to Infineon AURIX TC3xx MCU during ignition transients. Use Value: ±2.5% threshold accuracy over full automotive temperature range avoids false resets; 140ms timeout accommodates slow-ramping 5V buck converter startup. |
Use Scenario: Used with external resistor divider on RESET IN pin (via MAX6387/MAX6388 variant) to independently monitor 1.2V core and 3.3V I/O supplies. IC Role / Device Role / Timing Role: Single-supply base part (MAX6381XR29D3+T) serves as reference design foundation for dual-rail supervision variants. Use Value: Identical 2.93V threshold and D3 timing enable direct substitution into existing layouts when upgrading to dual-monitoring versions (e.g., MAX6387XR29D3+T). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR29D3+T | Same 2.93V threshold and 140ms timeout, but push-pull active-low output; higher ICC (7μA at 1.8V) | Eliminates need for external pullup resistor; unsuitable for wired-OR or level-shifted reset buses | Select when board layout prohibits external pullup or when driving capacitive loads >50pF directly |
| TLV803EB29DBZR | 2.93V threshold, 140ms timeout, open-drain active-low; higher ICC (1.8μA typ at 1.8V), wider temp range (-40°C to +125°C) | Lower supply current but tighter 1.5% threshold accuracy; not AEC-Q100 qualified | Select for cost-sensitive consumer applications where automotive qualification is unnecessary |
Compared with MAX6381XR29D3+T, MAX6326XR29D3+T offers integrated push-pull drive at the expense of higher quiescent current and loss of bus-sharing capability, while TLV803EB29DBZR provides lower ICC and tighter threshold tolerance but lacks automotive qualification and long-term Maxim supply chain support.
Availability
MAX6381XR29D3+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered data loggers, automotive body control units, and dual-voltage microcontroller systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR29D3+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 demanding industrial, automotive, and communications applications, with emphasis on reliability, low power, and high integration.
The MAX6381–MAX6390 product line delivers single/dual low-voltage microprocessor supervisory circuits optimized for battery longevity, wide-temperature operation, and robust immunity to supply transients in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6381XR29D3+T and how tightly is it specified?
The MAX6381XR29D3+T has a nominal reset threshold of 2.93V, with a guaranteed range of 2.85V (min) to 3.00V (max) at +25°C. Over the full operating temperature range of -40°C to +125°C, the threshold maintains ±2.5% accuracy relative to the nominal value, corresponding to 2.858V to 3.002V at +25°C and scaling linearly with temperature via 60ppm/°C tempco.
Does MAX6381XR29D3+T include a manual reset input (MR) or auxiliary RESET IN pin?
No, MAX6381XR29D3+T does not include a manual reset input or auxiliary RESET IN pin. As a member of the MAX6381/MAX6382/MAX6383 subgroup, it is a dedicated single-supply supervisor with only three terminals: RESET (open-drain active-low), VCC, and GND. Manual reset functionality is available only in MAX6384–MAX6386 and MAX6390 variants, while RESET IN is exclusive to MAX6387–MAX6389.
What is the minimum VCC voltage at which MAX6381XR29D3+T guarantees correct reset output logic state?
MAX6381XR29D3+T guarantees that its RESET output remains in a valid logic state - specifically, high-impedance (not asserted) when inactive and capable of pulling low when asserted - down to VCC = 1.0V. This ensures deterministic behavior during deep brownout events where other supervisors may enter undefined states or oscillate.
Can MAX6381XR29D3+T be used in automotive applications, and what qualification does it hold?
Yes, MAX6381XR29D3+T is AEC-Q100 qualified for automotive applications. The "/V" suffix denotes automotive qualification, and although MAX6381XR29D3+T itself carries the "+T" RoHS-compliant marking, its underlying die and process meet AEC-Q100 Grade 1 requirements (-40°C to +125°C), making it suitable for body control, infotainment, and ADAS subsystems where reliability under thermal stress is critical.
What are the absolute maximum ratings for VCC and RESET pins on MAX6381XR29D3+T?
The absolute maximum rating for VCC is -0.3V to +6.0V relative to GND. For the open-drain RESET output, the absolute maximum is -0.3V to +6.0V regardless of VCC level - enabling safe interfacing with higher-voltage logic families when used with appropriate pullup. Exceeding these limits risks permanent device damage, per Maxim's Absolute Maximum Ratings specification.
MAX6381XR29D3+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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR29D3+T FAQ
1.How can I place an order for MAX6381XR29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR29D3+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 MAX6381XR29D3+T reliable?
The price and inventory of MAX6381XR29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR29D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR29D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR29D3+T?
MAX6381XR29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR29D3+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 MAX6381XR29D3+T?
For technical support, including MAX6381XR29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR29D3+T requirements.
6.How does Aetrix verify that MAX6381XR29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR29D3+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 MAX6381XR29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR29D3+T?
All MAX6381XR29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR29D3+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 MAX6381XR29D3+T part is unused and in its original packaging.
Return procedure for MAX6381XR29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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