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Analog Devices Inc./Maxim Integrated MAX6381XR18D2+
- Part No.:
- MAX6381XR18D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR18D2+.pdf
- Description:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
MAX6381XR18D2+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 1.8V reset threshold, 20ms minimum reset timeout, active-low push-pull reset output, and guaranteed operation down to VCC = 1V. It monitors single supply rails in battery-powered systems and embedded controllers, consuming only 3µA at +1.8V.
For engineers reviewing the MAX6381XR18D2+ datasheet, MAX6381XR18D2+ pinout, MAX6381XR18D2+ application, or MAX6381XR18D2+ equivalent, key selection criteria include ±2.5% reset threshold accuracy over -40°C to +125°C, SC70-3 package compatibility, negative-going transient immunity, and absence of manual reset or auxiliary input functionality.
Technical Context
The MAX6381XR18D2+ implements a precision bandgap-based voltage comparator with internal 1.8V reference and an on-chip timer for fixed 20ms reset assertion after VCC recovery. Its push-pull output drives low during reset and guarantees valid logic state even as VCC drops to 1V.
No manual reset (MR) or auxiliary RESET IN inputs are present - this variant is optimized for simple single-rail monitoring without user-initiated or dual-voltage supervision. The device uses BiCMOS process technology and contains 647 transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8V nominal (±2.5% over -40°C to +125°C); sets precise brownout detection point for +1.8V logic supplies |
| Reset Timeout | 20ms minimum; ensures µP remains held in reset long enough for stable power-up sequencing |
| Supply Current | 3µA at +1.8V; enables multi-year battery life in portable and IoT edge nodes |
| Operating Voltage | 1.0V to 5.5V; supports valid reset assertion down to VCC = 1V for graceful shutdown handling |
| Output Type | Active-low push-pull; eliminates need for external pull-up resistor and provides strong drive capability |
| Tempco | 60ppm/°C; maintains tight threshold stability across industrial temperature range |
| Package | 3-pin SC70 (X3-2); 1.25mm × 0.85mm footprint ideal for space-constrained PCBs |
Pinout & Package
MAX6381XR18D2+ is housed in a 3-pin SC70 package (pkg code X3-2), measuring 1.25mm × 0.85mm × 0.95mm, with gull-wing leads and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected to system ground plane |
| 2 | RESET | Active-low push-pull output; sinks current when asserted, sources current when deasserted; directly interfaces µP reset input |
| 3 | VCC | Power supply input and monitored rail; powers internal circuitry and serves as the sole voltage under supervision |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.8V threshold | Eliminates external resistor divider and calibration effort for +1.8V core supply monitoring |
| 20ms fixed reset timeout | Matches typical power-up stabilization time of low-voltage µPs and SoCs without requiring timing capacitor |
| 3µA supply current at 1.8V | Reduces quiescent power in always-on subsystems - critical for coin-cell and energy-harvesting applications |
| Guaranteed operation to VCC = 1V | Ensures deterministic reset behavior during deep brownout or controlled power-down sequences |
| SC70-3 package | Enables high-density placement in wearables, medical sensors, and compact industrial modules |
Applications
| Portable Power Management | Battery-Powered Microcontrollers |
|---|---|
Use Scenario: Monitoring Li-ion battery discharge into 1.8V logic domain of BLE SoC during deep sleep mode. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to hold µP in reset until battery voltage recovers above 1.8V ±2.5%. Use Value: Prevents erratic execution due to marginal supply; 3µA ICC extends shelf life and operational runtime. | Use Scenario: Ensuring reliable boot sequence in handheld diagnostic tool powered by single-cell alkaline battery. IC Role / Device Role / Timing Role: Single-rail supervisor generating 20ms minimum reset pulse after battery insertion or wake-up from ultra-low-power mode. Use Value: Guarantees µP initialization completes before peripherals activate; SC70-3 footprint saves board area in pen-sized enclosure. |
| Industrial Sensor Nodes | Low-Voltage FPGA Configuration |
Use Scenario: Validating stable 1.8V I/O supply before enabling RS-485 transceiver in remote environmental sensor. IC Role / Device Role / Timing Role: Reset generator tied to 1.8V rail, asserting reset until voltage exceeds 1.8V threshold and remains stable for ≥20ms. Use Value: Avoids bus contention and latch-up risk; ±2.5% accuracy ensures consistent trip point across temperature extremes. | Use Scenario: Controlling configuration reset timing for 1.8V-configurable FPGA in programmable logic module. IC Role / Device Role / Timing Role: Providing clean, glitch-free active-low reset signal synchronized to 1.8V supply ramp with fixed 20ms hold time. Use Value: Eliminates need for RC network; push-pull output ensures fast edge rates and noise-immune reset assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | Same 1.8V threshold and 20ms timeout, but ±3% accuracy over -40°C to +105°C; higher 10µA ICC at 1.8V | Limited to commercial temperature range; less suitable for extended industrial deployments | Select when cost sensitivity outweighs extended temp range and ultra-low ICC requirements |
| TPS3808G18DBVR | 1.8V threshold with 20ms timeout, ±0.5% initial accuracy, but 1.2µA ICC at 1.8V; requires external capacitor for timeout | Higher accuracy and lower ICC, but adds BOM item and layout complexity for timing capacitor | Select when highest threshold precision and lowest power are mandatory, and capacitor placement is feasible |
Compared with MAX809TRD2+T, MAX6381XR18D2+ offers tighter temperature drift control and lower supply current for battery-critical designs; compared with TPS3808G18DBVR, it trades absolute accuracy and ultra-low ICC for zero-component simplicity and guaranteed industrial temperature operation.
Availability
MAX6381XR18D2+ is available at Aetrix Electronics and suitable for portable electronics, industrial sensor nodes, battery-powered microcontrollers, and low-voltage FPGA configuration requiring stable component supply and long-term lifecycle support.
Supply support for MAX6381XR18D2+ 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 in industrial, automotive, and communications markets.
The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits optimized for space-constrained, low-power embedded systems requiring accurate, reliable reset generation without external components.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6381XR18D2+?
The MAX6381XR18D2+ has a factory-set nominal reset threshold of 1.8V with ±2.5% accuracy over the full operating temperature range of -40°C to +125°C. This means the actual trip point falls between 1.755V and 1.845V across temperature, ensuring robust brownout detection for 1.8V logic supplies without external trimming.
Does MAX6381XR18D2+ include a manual reset input (MR)?
No, MAX6381XR18D2+ does not feature a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Only MAX6384–MAX6386 and MAX6390 variants include MR; the MAX6381XR18D2+ is designed exclusively for automatic VCC monitoring with no user-initiated reset capability.
What package type and dimensions does MAX6381XR18D2+ use?
MAX6381XR18D2+ is supplied in a 3-pin SC70 package (pkg code X3-2), measuring 1.25mm × 0.85mm × 0.95mm with gull-wing leads. This ultra-small outline enables high-density placement in wearables, medical patches, and compact industrial modules where board space is severely constrained.
Can MAX6381XR18D2+ monitor a second voltage rail via RESET IN?
No, MAX6381XR18D2+ does not support auxiliary voltage monitoring. The RESET IN pin is absent - only MAX6387–MAX6389 variants include this feature. MAX6381XR18D2+ monitors only the VCC rail and provides no provision for external resistor-divider networks or secondary supply supervision.
What is the supply current consumption of MAX6381XR18D2+ at different voltages?
MAX6381XR18D2+ draws 3µA at +1.8V, 4µA at +2.5V, 6µA at +3.6V, and 7µA at +5.5V (typical, TA = +25°C). Its ultra-low ICC enables multi-year operation from coin cells and makes it ideal for always-on IoT endpoints and energy-harvesting systems where quiescent power dominates lifetime budget.
MAX6381XR18D2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR18D2+ FAQ
1.How can I place an order for MAX6381XR18D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR18D2+ 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 MAX6381XR18D2+ reliable?
The price and inventory of MAX6381XR18D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR18D2+ is usually 5 days.
3.What payment methods are accepted for MAX6381XR18D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR18D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR18D2+?
MAX6381XR18D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR18D2+ 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 MAX6381XR18D2+?
For technical support, including MAX6381XR18D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR18D2+ requirements.
6.How does Aetrix verify that MAX6381XR18D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6381XR18D2+ 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 MAX6381XR18D2+ meets industry standards.
7.What is the process for return or replacement of MAX6381XR18D2+?
All MAX6381XR18D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR18D2+, 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 MAX6381XR18D2+ part is unused and in its original packaging.
Return procedure for MAX6381XR18D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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