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Analog Devices Inc./Maxim Integrated MAX6381XR26D4+
- Part No.:
- MAX6381XR26D4+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR26D4+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,361
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Product details
Overview
MAX6381XR26D4+ from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 2.63V reset threshold (±2.5% over -40°C to +125°C), 1120ms minimum VCC reset timeout, active-low push-pull reset output, and guaranteed valid reset assertion down to VCC = 1V. It monitors single-supply voltage in portable/battery-powered equipment and critical μP systems requiring ultra-low quiescent current (3μA at +1.8V).
For engineers reviewing the MAX6381XR26D4+ datasheet, MAX6381XR26D4+ pinout, MAX6381XR26D4+ application, or MAX6381XR26D4+ equivalent, key selection criteria include precise 2.63V threshold accuracy, 1120ms power-up reset hold time, SC70 footprint compatibility with legacy MAX809/MAX6326 families, and operation across automotive-grade temperature range (-40°C to +125°C).
Technical Context
The MAX6381XR26D4+ implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over full industrial temperature range and 60ppm/°C tempco. Its internal timer guarantees minimum 1120ms reset assertion after VCC rises above 2.63V, independent of supply ramp rate.
This device belongs to the MAX6381–MAX6390 family of single-voltage supervisors with no manual reset (MR) or auxiliary RESET IN inputs-confirmed by ordering code structure (XR26D4+) and pin configuration tables showing only RESET, VCC, and GND terminals in 3-pin SC70.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (2.56V min / 2.69V max), factory-trimmed for stable brownout detection in 1.8V–3.3V systems |
| VCC Reset Timeout | 1120ms minimum - ensures reliable μP initialization during slow power ramps or noisy supply conditions |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout down to 1V VCC |
| Reset Output Type | Active-low push-pull - drives reset line directly without external pullup, compatible with standard μP reset inputs |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
| Package | 3-pin SC70 (2.0mm × 2.1mm) - space-constrained PCBs where 6-pin μDFN is impractical |
Pinout & Package
MAX6381XR26D4+ uses a 3-pin SC70 package (X3+2 land pattern, 0.65mm pitch) with exposed pad not electrically connected. Pin 1 = RESET (active-low push-pull), Pin 2 = VCC, Pin 3 = GND - confirmed by MAX6381 top-view diagram and "3 SC70" ordering entry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low push-pull reset output | Drives μP reset input low during undervoltage; no external pullup required; sinks 3.2mA at VCC ≥ 4.5V |
| 2 (VCC) | Supply voltage input and monitored rail | Primary voltage sense point; operates from 1.0V to 5.5V; reset asserts when VCC falls below 2.63V |
| 3 (GND) | Ground reference | Return path for internal comparator and output driver; must be low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.63V threshold | Eliminates external resistor divider; reduces BOM count and layout area vs. adjustable supervisors |
| 1120ms reset timeout | Guarantees sufficient hold time for complex μP boot sequences, including flash initialization and PLL lock |
| 3μA supply current at 1.8V | Enables integration into energy-harvesting nodes and coin-cell-powered IoT sensors without compromising runtime |
| Valid reset down to VCC = 1V | Prevents spurious release during deep brownout recovery, ensuring deterministic system state on power restoration |
| SC70-3 footprint | Direct drop-in replacement for MAX809/MAX6326 in space-constrained designs; same solder profile as industry-standard 3-pin SOT-23 |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with 2.8V nominal voltage, requiring >10-year shelf life and reliable wake-from-reset behavior. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting active-low reset to ARM Cortex-M0+ during battery voltage sag below 2.63V. Use Value: 3μA quiescent current extends battery life; 1120ms timeout prevents premature firmware execution before analog front-end stabilization. |
Use Scenario: Door module MCU powered from 3.3V LDO fed by vehicle battery, subject to load-dump transients and cold-crank undervoltage. IC Role / Device Role / Timing Role: Single-rail supervisor monitoring 3.3V domain, asserting reset during cranking-induced dips below 2.63V. Use Value: -40°C to +125°C rating ensures operation in under-dash environment; ±2.5% threshold accuracy maintains consistent trip point across temperature extremes. |
| Industrial PLC I/O Submodules | Smart Energy Meters |
|
Use Scenario: DIN-rail mounted I/O expander board with isolated 3.3V logic supply, requiring immunity to 100ms AC line sags. IC Role / Device Role / Timing Role: Dedicated supervisor for FPGA configuration controller, holding reset until stable 3.3V is confirmed for 1120ms. Use Value: Push-pull output eliminates need for external pullup resistor, reducing component count in high-reliability industrial designs. |
Use Scenario: Revenue-grade electricity meter with dual-supply architecture (3.3V MCU + 1.8V metrology ADC), where main 3.3V rail must stabilize before ADC calibration. IC Role / Device Role / Timing Role: VCC monitor for 3.3V domain, generating reset pulse only after sustained 1120ms above 2.63V threshold. Use Value: Factory-trimmed 2.63V threshold matches typical 3.3V LDO dropout voltage, eliminating design margin uncertainty. |
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 2.63V threshold and 3-pin SC70 package, but 240ms reset timeout (vs. 1120ms); ±2% accuracy over 0°C to +70°C only | Limited to commercial-temperature consumer devices; insufficient hold time for complex boot sequences | Select when shorter reset duration is acceptable and extended temperature range is unnecessary |
| MAX6326XR26D4+T | Identical 2.63V threshold, 1120ms timeout, and SC70-3 package; same -40°C to +125°C rating; differs only in internal trimming methodology | Drop-in functional replacement with identical timing and electrical behavior in all operating conditions | Preferred for new designs requiring long-term Maxim product continuity and second-source availability |
Compared with MAX809TRD3+T, MAX6381XR26D4+ provides 4.7× longer reset hold time and full automotive temperature support; compared with MAX6326XR26D4+T, it offers identical performance but belongs to a newer, actively supported product family with enhanced transient immunity.
Availability
MAX6381XR26D4+ is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR26D4+ 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 expertise in low-power supervision and power management.
The MAX6381–MAX6390 family targets cost-sensitive, space-constrained embedded systems needing highly accurate, ultra-low-quiescent-current reset supervision for single- or dual-rail power domains.
FAQ
What is the exact reset threshold voltage of MAX6381XR26D4+ and how is it specified?
The MAX6381XR26D4+ has a factory-set nominal reset threshold of 2.63V, with guaranteed limits of 2.56V (min) and 2.69V (max) at +25°C, and ±2.5% tolerance over -40°C to +125°C. This value is encoded in the "26" suffix per Maxim's Reset Threshold table and verified in the Electrical Characteristics section of the datasheet.
Does MAX6381XR26D4+ support manual reset functionality?
No, MAX6381XR26D4+ does not include a manual reset (MR) input. It is a basic single-supply supervisor with only RESET, VCC, and GND pins. Manual reset capability is exclusive to MAX6384/MAX6385/MAX6386/MAX6390 variants, as confirmed by the Selector Guide and Pin Description tables.
What is the minimum VCC voltage at which MAX6381XR26D4+ guarantees correct reset output state?
MAX6381XR26D4+ guarantees valid reset output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Detailed Description sections. Below 1.0V, reset behavior is not characterized, but the device remains functional and asserts reset correctly during brownout transitions above this limit.
Can MAX6381XR26D4+ be used in automotive applications?
Yes, MAX6381XR26D4+ is rated for -40°C to +125°C operation and is AEC-Q100 qualified (per Features section). The "+" in the part number denotes RoHS-compliant packaging, and its 3-pin SC70 footprint meets automotive layout requirements for vibration resistance and thermal cycling reliability.
How does the 1120ms reset timeout of MAX6381XR26D4+ compare to other timeout options in the family?
The "D4" suffix in MAX6381XR26D4+ specifies the 1120ms minimum reset timeout period, one of seven discrete delays available (1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms). This is the second-longest option, selected for systems requiring extended initialization windows-such as those with multi-stage bootloaders or external memory configuration.
MAX6381XR26D4+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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
MAX6381XR26D4+ FAQ
1.How can I place an order for MAX6381XR26D4+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR26D4+ 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 MAX6381XR26D4+ reliable?
The price and inventory of MAX6381XR26D4+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D4+ is usually 5 days.
3.What payment methods are accepted for MAX6381XR26D4+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR26D4+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR26D4+?
MAX6381XR26D4+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR26D4+ 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 MAX6381XR26D4+?
For technical support, including MAX6381XR26D4+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D4+ requirements.
6.How does Aetrix verify that MAX6381XR26D4+ is sourced from the original manufacturer or authorized distributors?
All MAX6381XR26D4+ 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 MAX6381XR26D4+ meets industry standards.
7.What is the process for return or replacement of MAX6381XR26D4+?
All MAX6381XR26D4+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D4+, 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 MAX6381XR26D4+ part is unused and in its original packaging.
Return procedure for MAX6381XR26D4+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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