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Analog Devices Inc./Maxim Integrated MAX6381XR29D4-T
- Part No.:
- MAX6381XR29D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR29D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
MAX6381XR29D4-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), 1120ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors single supply voltage down to +1.0V, consumes only 3μA at +1.8V, and guarantees valid reset state during brownout conditions in battery-powered embedded controllers.
For engineers reviewing the MAX6381XR29D4-T datasheet, MAX6381XR29D4-T pinout, MAX6381XR29D4-T application, or MAX6381XR29D4-T equivalent, key selection criteria include reset threshold accuracy, manual reset compatibility, open-drain drive capability with external pullup, and automotive-grade thermal stability across -40°C to +125°C operation.
Technical Context
The MAX6381XR29D4-T implements a precision bandgap-based reset comparator with ±2.5% threshold tolerance over full temperature range and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 1120ms reset assertion after VCC recovers above 2.93V.
As a member of the MAX6381–MAX6390 family, it lacks manual reset (MR) and auxiliary RESET IN inputs-confirmed by ordering guide and pin configuration tables-making it a dedicated single-supply monitor with minimal pin count and no secondary voltage sensing capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (±2.5% over -40°C to +125°C); ensures reliable brownout detection for 3.3V I/O rails |
| VCC Operating Range | +1.0V to +5.5V; supports valid reset assertion even during deep undervoltage down to 1V |
| Reset Timeout | 1120ms minimum; holds μP in reset long enough for power stabilization and clock lock in embedded systems |
| Supply Current | 3μA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors |
| Output Type | Active-low open-drain; requires external pullup for logic-level compatibility with diverse host processors |
| Package | 3-pin SC70 (X3+2 outline); footprint-compatible with space-constrained portable designs |
| Temperature Range | -40°C to +125°C; qualified for industrial and automotive under-hood applications |
Pinout & Package
MAX6381XR29D4-T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), optimized for ultra-small PCB area and low thermal resistance (θJA = 340.4°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks current when asserted; requires external pullup resistor |
| 2 | VCC | Main supply input and monitored voltage source; powers internal circuitry and sets reset threshold reference |
| 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±2.5% accuracy over full temperature range-eliminates external resistor divider calibration |
| Ultra-low quiescent current | 3μA at +1.8V-enables >10-year battery life in always-on monitoring nodes |
| Guaranteed reset validity | Operates correctly down to VCC = 1.0V-ensures deterministic reset behavior during severe brownouts |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches up to 100mV below threshold-reduces false resets in noisy power environments |
| Open-drain output architecture | Supports wired-OR reset bus configurations and mixed-voltage system interfacing via external pullup |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 3.3V I/O rail in programmable logic controller during cold cranking and load dump events. IC Role / Device Role / Timing Role: Single-supply reset supervisor asserting active-low open-drain signal to ARM Cortex-M7 MCU upon voltage sag below 2.93V. Use Value: 1120ms timeout prevents spurious reboots during transient dips; ±2.5% threshold accuracy ensures consistent trip point across -40°C to +125°C ambient. | Use Scenario: Provides fail-safe reset for microcontroller in door module exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Dedicated VCC monitor with open-drain output tied to shared reset bus, enabling coordinated restart of multiple subsystems. Use Value: 3μA supply current minimizes parasitic drain on vehicle battery; SC70 package fits tight mechanical envelopes behind interior panels. |
| Portable Medical Sensor Node | Smart Energy Meter |
Use Scenario: Ensures reliable startup and brownout recovery in Bluetooth LE–enabled glucose monitor powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Low-power reset supervisor maintaining valid reset state down to 1.0V VCC to prevent corrupted EEPROM writes during battery depletion. Use Value: Open-drain output interfaces directly with 1.8V BLE SoC reset pin; 2.93V threshold aligns with regulated 3.0V LDO output. | Use Scenario: Supervises 3.3V supply in ANSI C12.22–compliant meter with optical port and RF mesh interface. IC Role / Device Role / Timing Role: Single-point reset generator asserting active-low signal to dual-core application processor and metrology ASIC simultaneously. Use Value: 1120ms timeout exceeds power-up sequencing requirements for isolated DC-DC converters; AEC-Q100–compatible thermal performance ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR29D4-T | Same 2.93V threshold, 1120ms timeout, and 3-pin SC70 package; ±2.0% threshold accuracy (tighter than MAX6381's ±2.5%) | No open-drain option-push-pull active-low output only; incompatible with wired-OR reset buses | Select when higher threshold accuracy is required and push-pull drive suffices for target MCU interface |
| TLV809K29DBZR | 2.93V threshold, 140ms timeout (not 1120ms), SOT-23-3 package; 0.5μA typical ICC at 1.8V (lower than MAX6381XR29D4-T) | Lacks guaranteed operation down to VCC = 1.0V; max operating VCC = 6.0V but reset validity not specified below 1.6V | Select for ultra-low-power applications where shorter reset hold time is acceptable and VCC never drops below 1.6V |
Compared with MAX6381XR29D4-T, MAX6326XR29D4-T offers tighter threshold accuracy but sacrifices open-drain flexibility, while TLV809K29DBZR reduces current draw significantly but cannot guarantee reset integrity below 1.6V-making MAX6381XR29D4-T uniquely suited for deep-brownout resilience in industrial edge nodes.
Availability
MAX6381XR29D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor nodes, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR29D4-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 industrial, automotive, and computing applications, emphasizing high reliability and low power.
The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for battery-powered and thermally demanding embedded systems requiring guaranteed reset behavior across -40°C to +125°C.
FAQ
What is the exact reset threshold voltage of MAX6381XR29D4-T and how stable is it over temperature?
The MAX6381XR29D4-T has a factory-set nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. This corresponds to a min/max threshold window of 2.85V to 3.00V at +25°C and 2.80V to 3.00V across extremes. The device uses a precision bandgap reference with 60ppm/°C tempco to maintain stability, making MAX6381XR29D4-T suitable for applications where supply rail margins are tight and thermal drift must be minimized.
Does MAX6381XR29D4-T support manual reset functionality?
No, MAX6381XR29D4-T does not include a manual reset (MR) input. According to the Selector Guide and Pin Configurations section of the datasheet, MR is only present on MAX6384/MAX6385/MAX6386 and MAX6390 variants. MAX6381XR29D4-T is a dedicated single-supply monitor with RESET, VCC, and GND pins only-no MR or RESET IN terminals. Therefore, MAX6381XR29D4-T relies solely on VCC monitoring and cannot be externally triggered via pushbutton or logic signal.
What is the function and electrical behavior of the RESET pin on MAX6381XR29D4-T?
The RESET pin on MAX6381XR29D4-T is an active-low open-drain output. When VCC falls below 2.93V, the internal FET pulls RESET low; when VCC rises above threshold, RESET remains low for ≥1120ms before going high-impedance. Because it is open-drain, MAX6381XR29D4-T requires an external pullup resistor (typically 10kΩ to VCC or another logic rail) to establish a defined high state. This architecture allows MAX6381XR29D4-T to share a common reset bus with other open-drain devices-a key feature absent in push-pull alternatives.
Can MAX6381XR29D4-T operate reliably when VCC drops below 1.8V?
Yes, MAX6381XR29D4-T is explicitly guaranteed to function correctly down to VCC = 1.0V. The datasheet states "Reset Output State Guaranteed Valid Down to VCC = 1V", and electrical characteristics confirm valid VOL and VOH operation at VCC ≥ 1.0V with appropriate sink/source currents. This makes MAX6381XR29D4-T especially valuable in battery-powered systems where supply voltage decays gradually-unlike many competitors that cease valid reset assertion below 1.6V. Thus, MAX6381XR29D4-T maintains deterministic behavior throughout the entire discharge curve of a Li-MnO₂ or alkaline cell.
Is MAX6381XR29D4-T qualified for automotive applications?
MAX6381XR29D4-T itself is not automotive-qualified; only versions with the "/V" suffix (e.g., MAX6381XR29D4/V+T) are AEC-Q100 qualified. The "-T" suffix denotes tape-and-reel packaging, but absence of "/V" means this specific part number is rated for industrial temperature range (-40°C to +125°C) without formal automotive qualification testing. While its operating range matches automotive under-hood requirements, MAX6381XR29D4-T lacks the stress-test documentation and process controls mandated for automotive use. For automotive designs, specify MAX6381XR29D4/V+T instead of MAX6381XR29D4-T.
MAX6381XR29D4-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:
- Obsolete
- 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:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR29D4-T FAQ
1.How can I place an order for MAX6381XR29D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR29D4-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 MAX6381XR29D4-T reliable?
The price and inventory of MAX6381XR29D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR29D4-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR29D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR29D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR29D4-T?
MAX6381XR29D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR29D4-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 MAX6381XR29D4-T?
For technical support, including MAX6381XR29D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR29D4-T requirements.
6.How does Aetrix verify that MAX6381XR29D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR29D4-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 MAX6381XR29D4-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR29D4-T?
All MAX6381XR29D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR29D4-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 MAX6381XR29D4-T part is unused and in its original packaging.
Return procedure for MAX6381XR29D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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