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Analog Devices Inc./Maxim Integrated MAX6381XR26D3
- Part No.:
- MAX6381XR26D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR26D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:566
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Product details
Overview
MAX6381XR26D3 from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.63V reset threshold, 140ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors +1.8V to +5.0V supply rails in space-constrained embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR26D3 datasheet, MAX6381XR26D3 pinout, MAX6381XR26D3 application, or MAX6381XR26D3 equivalent, this page delivers verified electrical specs, SC70-3 package mapping, reset timing behavior under temperature variation, manual reset compatibility (not applicable), and direct alternatives for voltage-monitoring reset IC selection.
Technical Context
The MAX6381XR26D3 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 140ms reset assertion after VCC rises above 2.63V, with immunity to negative-going VCC transients up to 100µs at 100mV overdrive.
As a single-supply monitor with no auxiliary input or manual reset pin, it operates exclusively on VCC, delivering a valid open-drain RESET signal that requires an external pull-up. Reset state remains guaranteed down to VCC = 1.0V, enabling robust behavior during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (factory-set, ±2.5% over –40°C to +125°C) - ensures reliable detection of 2.5V rail collapse before µP corruption. |
| Reset Timeout | 140ms min - holds reset long enough for stable clock and memory initialization in low-power MCUs. |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in portable sensors and IoT endpoints. |
| Operating Voltage | 1.0V to 5.5V - supports valid reset assertion even during severe undervoltage, down to near-dead-battery levels. |
| Output Type | Active-low open-drain - allows wired-OR configuration with other reset sources and flexible voltage-level translation via external pull-up. |
| Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
| Reset Propagation Delay | 35µs max (VCC falling) - responds rapidly to fast transients without false triggering. |
Pinout & Package
MAX6381XR26D3 is housed in a 3-pin SC70-3 package (pkg code X3-2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and lead-free finish. Pin 1 = RESET (active-low open-drain), Pin 2 = VCC, Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; requires external pull-up resistor to define logic-high level and sink current during assertion. |
| 2 | VCC | Main supply input and monitored voltage source; powers internal circuitry and sets fixed reset threshold reference point. |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to ensure accurate threshold comparison and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed threshold | 2.63V with ±2.5% tolerance across full temperature range - eliminates need for external resistor dividers or calibration. |
| Ultra-low ICC | 3µA at 1.8V - reduces quiescent load on coin-cell or energy-harvesting supplies by >90% vs. legacy reset ICs. |
| Valid reset down to VCC = 1V | Guaranteed logic state integrity below brownout recovery voltage - prevents spurious release during slow power ramp-up. |
| Negative transient immunity | Rejects VCC glitches ≤100µs at 100mV overdrive - avoids false resets in electrically noisy motor-control or power-conversion systems. |
| SC70-3 footprint | 2.0mm × 2.1mm body - fits into <3mm² PCB area, ideal for wearables, medical patches, and miniaturized edge nodes. |
Applications
| Industrial PLC I/O Module | Medical Wearable Sensor Node |
|---|---|
Use Scenario: Monitors 2.5V analog front-end and digital core rail in a DIN-rail mounted I/O module exposed to wide ambient temperature swings and conducted EMI. IC Role / Device Role / Timing Role: Single-point VCC supervisor providing clean power-on reset and brownout hold-off; asserts open-drain RESET until 2.5V rail stabilizes for ≥140ms. Use Value: Prevents firmware lockup during 12V-to-2.5V DC/DC startup transients and ensures deterministic recovery after line dips. | Use Scenario: Powers ultra-low-power ECG/PPG sensor ASIC in a disposable patch worn continuously for 72+ hours on a single CR2032 cell. IC Role / Device Role / Timing Role: Primary reset generator tied to main 2.5V LDO output; guarantees MCU reset remains asserted while battery voltage decays below 2.63V. Use Value: Extends usable battery life by enabling operation down to 1.8V VCC while maintaining valid reset signaling to 1.0V. |
| Automotive Body Control Unit | Smart Home Zigbee Router |
Use Scenario: Supervises 2.5V microcontroller supply in a BCM subassembly operating from vehicle battery (9V–16V) with cold-crank transients. IC Role / Device Role / Timing Role: Dedicated VCC monitor with high-temp rating; provides glitch-immune reset during engine start when input drops to 6V for 500ms. Use Value: Eliminates need for external RC timing network and withstands –40°C to +125°C junction temperatures without derating. | Use Scenario: Ensures orderly boot of dual-core SoC in a mains-powered smart hub with USB peripheral ports and RF coexistence challenges. IC Role / Device Role / Timing Role: Standalone reset supervisor for 2.5V SoC domain; open-drain output interfaces directly to SoC's active-low nRESET with 10kΩ pull-up to 3.3V. Use Value: Enables shared reset bus architecture with other peripherals and simplifies layout by removing discrete pull-up placement constraints. |
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 | 2.63V threshold, 140ms timeout, SOT23-3 package, push-pull active-low output | Requires no external pull-up but lacks VCC = 1.0V guarantee and has higher ICC (12µA) | Select when board space allows SOT23 and system does not require sub-1.8V reset validity. |
| TPS3808G125DBVR | 2.63V threshold, 200ms timeout (min), SOT23-6, push-pull active-low, 1.8V–6.5V VCC range | Higher supply current (12µA), larger footprint, includes manual reset input (unused here) | Choose if future design expansion requires MR capability or tighter 0.5% threshold accuracy. |
Compared with MAX6381XR26D3, MAX809TRD3+T offers simpler interface but sacrifices ultra-low power and deep brownout support; TPS3808G125DBVR adds flexibility at cost of size and current, making MAX6381XR26D3 optimal for area- and battery-limited designs demanding guaranteed 1V operation.
Availability
MAX6381XR26D3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical wearable sensor nodes, automotive body control units, and smart home Zigbee routers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6381XR26D3 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 computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family targets space- and power-constrained embedded systems needing highly accurate, low-quiescent-current reset supervision across wide temperature ranges - specifically optimized for modern µP/µC platforms with tight voltage margins.
FAQ
What is the exact reset threshold voltage of MAX6381XR26D3 and how stable is it over temperature?
The MAX6381XR26D3 has a factory-set reset threshold of 2.63V, with ±2.5% accuracy guaranteed over –40°C to +125°C. Its 60ppm/°C tempco ensures drift of less than 20mV across the full range, making it suitable for applications where supply rails operate near their minimum specification limits. This stability is confirmed in the Electrical Characteristics table of the official MAX6381–MAX6390 datasheet.
Does MAX6381XR26D3 include a manual reset input (MR) pin?
No, MAX6381XR26D3 does not include a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which features only VCC monitoring and open-drain/push-pull reset outputs. The MR pin is present only on MAX6384–MAX6386 and MAX6390 variants. For MAX6381XR26D3, reset is triggered solely by VCC falling below 2.63V.
What package type and dimensions does MAX6381XR26D3 use?
MAX6381XR26D3 uses the 3-pin SC70-3 package (pkg code X3-2), with body dimensions of 2.0mm × 2.1mm × 0.95mm and gull-wing leads. Pin 1 is RESET (open-drain), Pin 2 is VCC, and Pin 3 is GND. This compact footprint is documented in the "Ordering Information" and "Package Information" sections of the MAX6381–MAX6390 datasheet.
Can MAX6381XR26D3 operate with supply voltages below 1.8V?
Yes, MAX6381XR26D3 operates from 1.0V to 5.5V. Its reset output remains valid down to VCC = 1.0V, and supply current is specified at 1.8V (3µA), 2.5V (4µA), and 3.6V (6µA). Operation below 1.8V is fully supported per Absolute Maximum Ratings and Electrical Characteristics tables, enabling use in deeply brownout-prone systems.
Is MAX6381XR26D3 pin-compatible with MAX809 or other legacy reset ICs?
MAX6381XR26D3 is not pin-compatible with MAX809 due to differing pinouts: MAX6381XR26D3 uses SC70-3 (RESET/VCC/GND), while MAX809 uses SOT23-3 (VCC/GND/RESET). Though functionally similar, physical layout requires redesign. However, it is listed as *pin compatible* in the datasheet with MAX809/MAX810/MAX803 families *in terms of functional assignment*, not mechanical pin mapping.
MAX6381XR26D3 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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
MAX6381XR26D3 FAQ
1.How can I place an order for MAX6381XR26D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR26D3 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 MAX6381XR26D3 reliable?
The price and inventory of MAX6381XR26D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D3 is usually 5 days.
3.What payment methods are accepted for MAX6381XR26D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR26D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR26D3?
MAX6381XR26D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR26D3 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 MAX6381XR26D3?
For technical support, including MAX6381XR26D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D3 requirements.
6.How does Aetrix verify that MAX6381XR26D3 is sourced from the original manufacturer or authorized distributors?
All MAX6381XR26D3 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 MAX6381XR26D3 meets industry standards.
7.What is the process for return or replacement of MAX6381XR26D3?
All MAX6381XR26D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D3, 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 MAX6381XR26D3 part is unused and in its original packaging.
Return procedure for MAX6381XR26D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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