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Analog Devices Inc./Maxim Integrated MAX6381XR18D5+T
- Part No.:
- MAX6381XR18D5+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR18D5+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,318
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Product details
Overview
MAX6381XR18D5+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 1.8V reset threshold (±2.5% over -40°C to +125°C), 280ms minimum VCC reset timeout, and active-low push-pull reset output. It monitors single supply voltage during power-up/down/brownout in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX6381XR18D5+T datasheet, MAX6381XR18D5+T pinout, MAX6381XR18D5+T application, or MAX6381XR18D5+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, 3μA supply current at 1.8V, ±2.5% threshold accuracy over temperature, and compatibility with dual-voltage system monitoring where auxiliary inputs are not required.
Technical Context
The MAX6381XR18D5+T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and guarantees correct reset logic state for VCC ≥ 1V. Its internal timer enforces a fixed 280ms minimum reset assertion period after VCC rises above 1.8V.
It features negative-going VCC transient immunity up to 35µs at 100mV overdrive and includes built-in glitch rejection on reset assertion path. No manual reset (MR) or auxiliary RESET IN input is present-this variant is optimized for simple single-supply monitoring without external control or secondary voltage tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges |
| VCC Reset Timeout | 280ms minimum - provides sufficient hold time for μP initialization in low-power embedded systems |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable equipment |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup resistor and drives standard CMOS/TTL reset inputs directly |
| Reset Comparator Tempco | 60ppm/°C - limits threshold drift to <±15mV over full temperature range, critical for stable timing margins |
| Power-Down Reset Delay | 35µs - rejects short VCC glitches while ensuring fast response to sustained undervoltage events |
Pinout & Package
MAX6381XR18D5+T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, with RoHS-compliant lead-free finish (+T suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low when VCC < 1.8V; deasserts high after 280ms timeout - directly interfaces with μP /RESET pin without external components |
| 2 | VCC | Primary supply input and monitored voltage source - accepts 1.0V–5.5V; powers internal circuitry and reset comparator |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.8V threshold | Eliminates external resistor divider and calibration effort - reduces BOM count and layout area in space-constrained designs |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset behavior during deep discharge or slow power ramp scenarios common in battery-backed systems |
| 3μA supply current at 1.8V | Extends battery life in always-on monitoring applications - e.g., >10 years on CR2032 cell in sleep-mode instrumentation |
| 35µs power-down reset delay | Rejects typical PCB-level noise transients while responding rapidly to true brownout - avoids spurious resets in noisy environments |
| ±2.5% threshold accuracy over temperature | Maintains tight reset window across operating range - critical for systems with narrow supply tolerance (e.g., 1.8V core rails) |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Power Monitoring |
|---|---|
Use Scenario: Coin-cell–powered environmental sensor node operating at 1.8V with ultra-low sleep current. IC Role / Device Role / Timing Role: Supervises main supply rail and asserts reset if voltage drops below 1.8V during battery depletion. Use Value: Prevents corrupted firmware execution during brownout; 3μA quiescent current extends operational lifetime beyond 5 years. | Use Scenario: Industrial PLC controller using 1.8V FPGA configuration rail requiring deterministic power-on reset sequence. IC Role / Device Role / Timing Role: Generates 280ms minimum active-low reset pulse synchronized to VCC rise, ensuring FPGA configuration completes before release. Use Value: Guarantees valid reset assertion even as VCC decays to 1.0V - eliminates risk of partial configuration lockup. |
| Computers | Controllers |
Use Scenario: Embedded microcontroller in USB-powered diagnostic tool with 1.8V I/O domain. IC Role / Device Role / Timing Role: Monitors 1.8V supply and holds /RESET until stable, preventing boot failure during hot-plug insertion. Use Value: Push-pull output drives MCU reset pin directly - no pullup needed, reducing component count and board area. | Use Scenario: Motor control board with 1.8V digital logic supply subject to load-induced voltage sag. IC Role / Device Role / Timing Role: Detects sags below 1.8V and asserts reset for 280ms to force controlled restart of control firmware. Use Value: ±2.5% threshold accuracy ensures consistent trip point across temperature - avoids false resets in thermally variable enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | Same 3-pin SC70 package; 3.08V reset threshold; 240ms timeout; 1.2μA ICC at 3.3V | Designed for 3.3V systems - unsuitable for 1.8V rail monitoring without level-shifting | Select only if monitoring 3.0V–3.3V supplies; incompatible with 1.8V logic domains |
| TPS3808G18DBVR | 3-pin SOT-23; 1.8V threshold; 200ms timeout; 1.1μA ICC at 1.8V; requires external capacitor for timeout adjustment | Timeout not factory-fixed - introduces variability and additional BOM item vs. MAX6381XR18D5+T's monolithic 280ms | Prefer when ultra-low current (<1.5μA) is primary requirement and timeout flexibility justifies added component |
Compared with MAX809TRD3+T and TPS3808G18DBVR, MAX6381XR18D5+T uniquely delivers factory-set 1.8V threshold, fixed 280ms timeout, and guaranteed 3μA operation at 1.8V in a minimal 3-pin SC70 footprint - making it optimal for space- and power-constrained 1.8V microcontroller systems requiring zero-configuration reliability.
Availability
MAX6381XR18D5+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and controllers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6381XR18D5+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, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family was engineered specifically for single- and dual-supply microprocessor supervision in battery-constrained and thermally demanding environments, prioritizing ultra-low ICC, wide temperature operation, and factory-trimmed accuracy.
FAQ
What is the exact reset threshold voltage of the MAX6381XR18D5+T?
The MAX6381XR18D5+T has a factory-set nominal reset threshold of 1.8V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This means the actual trip point falls between 1.755V and 1.845V at +25°C, and between 1.755V and 1.845V across temperature - confirmed by Electrical Characteristics table on page 3 of the MAX6381–MAX6390 datasheet.
Does the MAX6381XR18D5+T support manual reset functionality?
No, the MAX6381XR18D5+T does not include a manual reset (MR) input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR and auxiliary RESET IN pins. Only MAX6384–MAX6390 variants feature MR; the MAX6381XR18D5+T is strictly a single-supply, push-pull active-low reset monitor with fixed timing.
What is the maximum VCC voltage the MAX6381XR18D5+T can withstand?
The MAX6381XR18D5+T supports an absolute maximum VCC of +6.0V, but its specified operating voltage range is 1.0V to 5.5V. Operation above 5.5V risks permanent damage, while operation below 1.0V invalidates reset output state guarantees. The device remains functional and asserts reset correctly down to VCC = 1.0V, as verified in Absolute Maximum Ratings and Electrical Characteristics sections.
Is the MAX6381XR18D5+T pin-compatible with other reset ICs?
Yes, the MAX6381XR18D5+T is pin-compatible with the MAX809/MAX810 series and MAX6326–MAX6348 family in the 3-pin SC70 package. Pin 1 is RESET (active-low), Pin 2 is VCC, and Pin 3 is GND - matching the industry-standard pinout for single-supply reset supervisors. However, threshold and timeout values differ; electrical compatibility requires verification per application.
What package type and dimensions does the MAX6381XR18D5+T use?
The MAX6381XR18D5+T uses a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads. It carries the "+T" suffix indicating RoHS-compliant, lead-free construction and is rated for -40°C to +125°C operation - confirmed in the Ordering Information table on page 1 of the datasheet.
MAX6381XR18D5+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:
- 1.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 280ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR18D5+T FAQ
1.How can I place an order for MAX6381XR18D5+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR18D5+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 MAX6381XR18D5+T reliable?
The price and inventory of MAX6381XR18D5+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR18D5+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR18D5+T?
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4.How is shipping managed for MAX6381XR18D5+T?
MAX6381XR18D5+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR18D5+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 MAX6381XR18D5+T?
For technical support, including MAX6381XR18D5+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR18D5+T requirements.
6.How does Aetrix verify that MAX6381XR18D5+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR18D5+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 MAX6381XR18D5+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR18D5+T?
All MAX6381XR18D5+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR18D5+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 MAX6381XR18D5+T part is unused and in its original packaging.
Return procedure for MAX6381XR18D5+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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