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Analog Devices Inc./Maxim Integrated MAX6381XR25D2+T
- Part No.:
- MAX6381XR25D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR25D2+T.pdf
- Description:
- IC MPU/RESET CIRC 2.50V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:67,500
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Product details
Overview
MAX6381XR25D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.50V reset threshold, 20ms minimum reset timeout, and active-low open-drain reset output. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. It is used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR25D2+T datasheet, MAX6381XR25D2+T pinout, MAX6381XR25D2+T application, or MAX6381XR25D2+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), negative-going transient immunity, manual reset compatibility (not supported on this variant), and SC70-3 package footprint constraints.
Technical Context
The MAX6381XR25D2+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer enforces a guaranteed minimum 20ms reset assertion after VCC rises above 2.50V.
As a member of the MAX6381–MAX6390 family, it uses BiCMOS process technology and features open-drain RESET output requiring an external pullup resistor. It lacks MR input and RESET IN pins-confirmed by pin configuration tables and selector guide-making it a single-supply, fixed-threshold, no-manual-reset variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.50V (factory-set, ±2.5% over –40°C to +125°C) |
| Reset Timeout | 20ms min (guaranteed assertion duration after VCC recovery) |
| Supply Current | 3μA at +1.8V (enables multi-year operation in coin-cell applications) |
| Operating Voltage | +1.0V to +5.5V (valid reset output guaranteed down to VCC = 1V) |
| Output Type | Active-low open-drain (requires external pullup; supports wired-OR bus topology) |
| Package | 3-pin SC70 (1.25mm × 0.85mm, 0.5mm pitch; land pattern 90-0208) |
| Temperature Range | –40°C to +125°C (AEC-Q100 qualified for automotive use when /V suffix applied) |
Pinout & Package
MAX6381XR25D2+T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not connected internally. Pin 1 = RESET (active-low open-drain), Pin 2 = VCC, Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low during reset; requires external pullup resistor; sinks ≥80µA at VCC ≥ 1.0V with VOL ≤ 0.3V |
| 2 - VCC | Power supply input and monitored voltage rail | Supplies device and serves as primary reset trigger source; accepts 1.0V–5.5V; absolute max –0.3V to +6.0V |
| 3 - GND | Ground reference | Return path for all internal circuitry and RESET sink current; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.50V with ±2.5% tolerance over full temperature range ensures predictable brownout detection without external components |
| Ultra-low quiescent current | 3μA at 1.8V enables >10-year battery life in always-on IoT sensors and wearables |
| Open-drain RESET output | Supports level-shifting and wired-OR configurations across mixed-voltage systems (e.g., 1.8V core + 3.3V I/O) |
| Negative-going VCC transient immunity | Rejects glitches up to 35µs wide at 100mV overdrive, reducing false resets in noisy power environments |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset behavior during deep brownout or controlled power-down sequences |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with 1.8V MCU core and 3.3V sensor interface. IC Role / Device Role / Timing Role: Supervises VCC rail to assert reset during battery voltage sag below 2.50V, preventing corrupted ADC readings or flash writes. Use Value: 3μA supply current extends battery life beyond 5 years; open-drain output interfaces cleanly with 3.3V logic via 10kΩ pullup. | Use Scenario: DIN-rail mounted I/O module with isolated 24V DC input converted to 3.3V/5V rails for microcontroller and fieldbus transceivers. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail to hold MCU in reset until stable post-power-up; 20ms timeout exceeds typical LDO settling time. Use Value: ±2.5% threshold accuracy ensures consistent reset point across industrial temperature extremes (–40°C to +85°C ambient). |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: BCM sub-module powered from vehicle battery (9V–16V) with local 5V/3.3V regulators feeding MCU and CAN transceiver. IC Role / Device Role / Timing Role: Resets MCU if 3.3V rail drops below 2.50V due to load dump or cold-crank dip; operates over –40°C to +125°C junction range. Use Value: AEC-Q100 qualification (with /V suffix) and 60ppm/°C tempco ensure compliance with automotive reliability standards. | Use Scenario: Revenue-grade meter with dual-core SoC (ARM Cortex-M4 + secure crypto coprocessor) operating from 3.3V LDO supplied by supercapacitor backup. IC Role / Device Role / Timing Role: Detects supercapacitor discharge below 2.50V to initiate graceful shutdown and nonvolatile register save before power loss. Use Value: Valid reset output down to VCC = 1V prevents metastability during final millisecond of power decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR25D2+T | Same 2.50V threshold, 20ms timeout, SC70-3 package; ±2.5% accuracy; but push-pull active-low output (no external pullup required) | Eliminates need for external pullup resistor; higher drive strength (3.2mA sink) but consumes slightly more current (7μA typ at 5.5V) | Select when board space is constrained and pullup resistor placement is impractical |
| TPS3808G125DBVR | 2.50V threshold, 20ms timeout, SOT-23-5 package; ±0.5% initial accuracy; 1.6μA typical ICC at 3.3V | Higher accuracy and lower current, but requires 5-pin layout and has different pinout (MR present but unused) | Select when highest threshold precision and lowest power are critical, and PCB redesign is feasible |
Compared with MAX6326XR25D2+T, MAX6381XR25D2+T trades off external component count for flexibility in bus topology; compared with TPS3808G125DBVR, it offers smaller footprint and automotive qualification path but with relaxed accuracy and higher current at low VCC.
Availability
MAX6381XR25D2+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR25D2+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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 product line delivers ultra-low-power, high-accuracy reset supervision for battery-operated and harsh-environment systems where deterministic power-on sequencing and brownout recovery are mission-critical.
FAQ
What is the exact reset threshold voltage of MAX6381XR25D2+T?
The MAX6381XR25D2+T has a factory-set reset threshold of 2.50V nominal, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This corresponds to a minimum threshold of 2.44V and maximum of 2.56V at +25°C, tightening to 2.44V–2.56V across temperature per datasheet specifications.
Does MAX6381XR25D2+T support manual reset functionality?
No, MAX6381XR25D2+T does not include a manual reset (MR) input. Per the selector guide and pin configuration diagrams, only MAX6384/MAX6385/MAX6386/MAX6390 variants feature MR. The MAX6381XR25D2+T is a dedicated single-supply reset monitor with RESET, VCC, and GND pins only.
What package type and dimensions does MAX6381XR25D2+T use?
MAX6381XR25D2+T uses a 3-pin SC70 package (outline number 21-0075) measuring 1.25mm × 0.85mm with 0.5mm lead pitch. Its land pattern is specified as 90-0208, and it is RoHS-compliant with lead-free terminations indicated by the "+" suffix.
Can MAX6381XR25D2+T monitor a second voltage rail?
No, MAX6381XR25D2+T does not support auxiliary voltage monitoring. The RESET IN pin is only available on MAX6387/MAX6388/MAX6389 variants. This part monitors VCC only and lacks both MR and RESET IN terminals, as confirmed by its 3-pin SC70 pinout and family selector table.
What is the minimum supply voltage at which MAX6381XR25D2+T guarantees valid reset output?
MAX6381XR25D2+T guarantees correct RESET output logic state down to VCC = 1.0V, as explicitly stated in the Electrical Characteristics table and Applications Information section. Below 1.0V, reset behavior is not characterized, and the device may not assert or deassert reliably.
MAX6381XR25D2+T 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:
- 2.5V
- 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+T FAQ
1.How can I place an order for MAX6381XR25D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR25D2+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 MAX6381XR25D2+T reliable?
The price and inventory of MAX6381XR25D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR25D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR25D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR25D2+T transactions.
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4.How is shipping managed for MAX6381XR25D2+T?
MAX6381XR25D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR25D2+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 MAX6381XR25D2+T?
For technical support, including MAX6381XR25D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR25D2+T requirements.
6.How does Aetrix verify that MAX6381XR25D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR25D2+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 MAX6381XR25D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR25D2+T?
All MAX6381XR25D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR25D2+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 MAX6381XR25D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR25D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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