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Analog Devices Inc./Maxim Integrated MAX6381XR25D2
- Part No.:
- MAX6381XR25D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR25D2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
The MAX6381XR25D2 from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.5V reset threshold, 140ms minimum reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors single supply rails in space-constrained embedded systems and consumes only 3µA at +1.8V.
For engineers reviewing the MAX6381XR25D2 datasheet, MAX6381XR25D2 pinout, MAX6381XR25D2 application, or MAX6381XR25D2 equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), negative-going transient immunity, SC70-3 package compatibility, and support for battery-powered brownout detection.
Technical Context
This device implements a precision bandgap-based voltage comparator with internal 1.27V reference for threshold generation, coupled to a temperature-stable RC timer for reset timeout control. The open-drain RESET output requires an external pullup and asserts low when VCC falls below 2.5V (min) or remains asserted for ≥140ms after VCC recovers.
No manual reset (MR) or auxiliary RESET IN inputs are present - the MAX6381XR25D2 is a minimal-function variant within the MAX6381–MAX6390 family, optimized for cost-sensitive, single-supply monitoring where external reset control or dual-voltage supervision is unnecessary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.50V (nominal), ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature ranges |
| Reset Timeout Period | 140ms (minimum) - guarantees µP reset hold time sufficient for full power stabilization in low-voltage systems |
| Supply Current | 3µA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout or partial power loss |
| Output Type | Active-low open-drain - allows wired-OR configuration and level translation with external pullup to any logic rail |
| Reset Output Validity | Guaranteed down to VCC = 1.0V - maintains deterministic logic state during catastrophic supply collapse |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and harsh-environment edge nodes |
Pinout & Package
MAX6381XR25D2 is housed in a 3-pin SC70-3 package (package 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 |
|---|---|---|
| Pin 1 | RESET | Open-drain active-low reset output; requires external pullup; sinks up to 80µA at VCC ≥ 1.0V with VOL ≤ 0.3V |
| Pin 2 | VCC | Main supply input and monitored voltage rail; accepts 1.0V–5.5V; powers internal comparator and timer |
| Pin 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 | 2.50V ±2.5% over full temperature range - eliminates external resistor divider and calibration effort |
| Negative-going VCC transient immunity | Rejects glitches <35µs wide at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Ultra-low quiescent current | 3µA at 1.8V - extends battery life in always-on monitoring applications without sacrificing reliability |
| Valid reset output at low VCC | RESET state guaranteed down to VCC = 1.0V - ensures safe processor initialization during rapid supply decay |
| SC70-3 footprint | 2.0mm × 2.1mm body - enables placement in ultra-dense portable electronics where board area is premium |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: A battery-powered temperature/humidity sensor transmits data every 5 minutes via BLE and enters deep sleep between readings. IC Role / Device Role / Timing Role: Supervisory IC asserting reset during cold-start or battery sag to prevent firmware corruption on wake-up. Use Value: 3µA supply current extends 200mAh coin cell life beyond 10 years; 140ms timeout ensures stable MCU clock lock before boot. |
Use Scenario: Power management unit in door module monitors 5V supply derived from vehicle battery, subject to load dump and cranking transients. IC Role / Device Role / Timing Role: Single-rail supervisor providing clean reset pulse to ARM Cortex-M0 during ignition sequence and accessory mode transitions. Use Value: ±2.5% threshold accuracy over –40°C to +125°C prevents false resets during extreme ambient conditions; SC70-3 fits tight PCB routing near connector. |
| Medical Wearable Patch | Smart Meter RTC Backup Circuit |
Use Scenario: ECG patch uses lithium polymer cell with discharge curve dropping from 4.2V to 2.8V; firmware must halt safely below 2.7V. IC Role / Device Role / Timing Role: Voltage monitor triggering controlled shutdown and memory save before brownout-induced crash. Use Value: 2.5V threshold provides 200mV safety margin above critical MCU operating voltage; open-drain output interfaces directly to 3.3V logic rail via 10kΩ pullup. |
Use Scenario: Electricity meter retains real-time clock and tamper logs during main AC failure using supercapacitor backup; VCC drops from 3.3V to 1.8V over seconds. IC Role / Device Role / Timing Role: Supervisor asserting reset to RTC controller when backup voltage falls below safe operating level. Use Value: Guaranteed RESET validity down to VCC = 1.0V ensures deterministic reset assertion even as supercap decays to endpoint; 140ms timeout accommodates slow capacitor discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326LTR25D2+T | Same 2.5V threshold, 140ms timeout, SC70-3 package; ±1.5% threshold accuracy (tighter); higher ICC (10µA at 1.8V) | Higher accuracy required in precision instrumentation; less suitable for ultra-low-power designs | Select when threshold stability is prioritized over current consumption |
| TPS3123E18DBVR | 2.63V threshold (not 2.5V), 200ms timeout, SOT-23-3; ±0.5% accuracy; 1.6µA ICC at 1.8V | Battery cutoff at higher voltage; longer timeout may delay recovery in fast-cycling systems | Select when lower ICC and tighter accuracy justify 130mV threshold shift and different timing |
Compared with MAX6326LTR25D2+T, the MAX6381XR25D2 trades threshold accuracy for 3× lower supply current - critical in energy-harvesting nodes. Versus TPS3123E18DBVR, it offers exact 2.5V trip point and proven transient immunity per Maxim's published test data, at the cost of slightly higher ICC.
Availability
MAX6381XR25D2 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical wearable patches, and smart meter RTC backup circuits requiring stable component supply and long-term lifecycle support.
Supply support for MAX6381XR25D2 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 applications in industrial, automotive, and communications markets.
The MAX6381–MAX6390 family was developed to deliver ultra-low-power, high-accuracy reset supervision in miniature packages for battery-operated and thermally aggressive systems - with the MAX6381XR25D2 targeting cost-optimized single-supply monitoring.
FAQ
What is the exact reset threshold voltage of the MAX6381XR25D2?
The MAX6381XR25D2 has a nominal reset threshold of 2.50V, with a guaranteed range of 2.44V (min) to 2.56V (max) over the full operating temperature range of –40°C to +125°C. This value is factory-trimmed and specified in the Reset Thresholds table of the datasheet under suffix "25".
Does the MAX6381XR25D2 include a manual reset input (MR)?
No, the MAX6381XR25D2 does not feature a manual reset input. It belongs to the base variant group (MAX6381/MAX6382/MAX6383) that lacks MR functionality. Manual reset capability is only present in MAX6384–MAX6390 variants, as confirmed in the Selector Guide and Pin Description sections.
What package type and dimensions does the MAX6381XR25D2 use?
The MAX6381XR25D2 is supplied in a 3-pin SC70-3 package (package code X3-2), with body dimensions of 2.0mm × 2.1mm × 0.95mm and gull-wing leads. This compact outline is documented in Package Outline 21-0075 and supports reflow soldering per JEDEC J-STD-020.
Can the MAX6381XR25D2 monitor two voltage rails simultaneously?
No, the MAX6381XR25D2 monitors only the VCC supply rail. Dual-rail supervision requires the RESET IN input, which is exclusive to MAX6387–MAX6389 variants. The MAX6381XR25D2 contains no auxiliary comparator or associated pins - confirmed by its 3-pin configuration and absence in the RESET IN functional description.
What is the minimum supply voltage at which the MAX6381XR25D2 guarantees correct RESET output logic state?
The MAX6381XR25D2 guarantees valid RESET output logic state down to VCC = 1.0V, as explicitly stated in the Electrical Characteristics table and Detailed Description section. Below this voltage, the internal circuitry may not maintain defined output behavior, but the device remains functional through full brownout.
MAX6381XR25D2 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:
- 2.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR25D2 FAQ
1.How can I place an order for MAX6381XR25D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR25D2 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 MAX6381XR25D2 reliable?
The price and inventory of MAX6381XR25D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR25D2 is usually 5 days.
3.What payment methods are accepted for MAX6381XR25D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR25D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR25D2?
MAX6381XR25D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR25D2 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 MAX6381XR25D2?
For technical support, including MAX6381XR25D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR25D2 requirements.
6.How does Aetrix verify that MAX6381XR25D2 is sourced from the original manufacturer or authorized distributors?
All MAX6381XR25D2 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 MAX6381XR25D2 meets industry standards.
7.What is the process for return or replacement of MAX6381XR25D2?
All MAX6381XR25D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR25D2, 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 MAX6381XR25D2 part is unused and in its original packaging.
Return procedure for MAX6381XR25D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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