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Analog Devices Inc./Maxim Integrated MAX6381XR24D2+T
- Part No.:
- MAX6381XR24D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR24D2+T.pdf
- Description:
- IC MPU/RESET CIRC 2.40V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,789
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Product details
Overview
MAX6381XR24D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 2.40V reset threshold (±2.5% over -40°C to +125°C), 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 - ideal for battery-powered microcontroller power-up sequencing.
For engineers reviewing the MAX6381XR24D2+T datasheet, MAX6381XR24D2+T pinout, MAX6381XR24D2+T application, or MAX6381XR24D2+T equivalent, key selection criteria include reset threshold accuracy, ultra-low supply current, open-drain output compatibility with mixed-voltage systems, and guaranteed operation across automotive temperature range (-40°C to +125°C).
Technical Context
The MAX6381XR24D2+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over full temperature range and 60ppm/°C tempco. Its internal timer generates a fixed 20ms minimum reset assertion period after VCC recovers above 2.40V, independent of supply ramp rate.
This variant belongs to the MAX6381–MAX6390 family's open-drain active-low subgroup (MAX6381/MAX6383/MAX6386/MAX6389/MAX6390) and lacks manual reset (MR) and auxiliary RESET IN inputs - confirmed by pin configuration and selector guide. It supports VCC transient immunity up to 35µs for 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.40V nominal, ±2.5% tolerance over -40°C to +125°C - ensures reliable brownout detection across automotive environments |
| Reset Timeout | 20ms minimum - provides sufficient hold time for microcontroller core initialization before release |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting with external pullup |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion even during deep brownout down to 1V VCC |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial control applications |
| Package | 3-pin SC70 (outline 21-0075) - 1.25mm × 0.85mm footprint for space-constrained PCBs |
Pinout & Package
MAX6381XR24D2+T uses a 3-pin SC70 package (outline 21-0075) with 0.65mm pitch and exposed pad not connected. Pin 1 is RESET (active-low open-drain), Pin 2 is VCC, and Pin 3 is GND - no NC pins. The small outline supports high-density layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low open-drain output | Requires external pullup resistor; sinks ≥80µA at VCC ≥1.0V with VOL ≤0.3V - compatible with 1.8V/3.3V/5V logic domains |
| 2: VCC | Power supply input | Monitored supply rail; accepts +1.0V to +5.5V; absolute max rating -0.3V to +6.0V - robust against transient overshoot |
| 3: GND | Ground reference | Common return path for internal comparator and output stage; must be low-impedance to ensure accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.40V with ±2.5% accuracy over -40°C to +125°C - eliminates need for external resistor dividers or calibration |
| Ultra-low quiescent current | 3μA at +1.8V - extends battery life in always-on monitoring circuits without compromising reset reliability |
| Open-drain reset output | Supports bidirectional voltage translation and multi-device reset bus sharing via single pullup |
| Negative-going VCC transient immunity | Rejects glitches ≤35µs wide at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Valid reset down to VCC = 1V | Ensures deterministic processor state during deep undervoltage conditions - critical for fail-safe shutdown |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Coin-cell–powered glucose monitor with ARM Cortex-M0+ MCU requiring guaranteed reset during battery voltage sag. IC Role / Device Role / Timing Role: Supervises main 3.0V supply rail and asserts open-drain reset until stable; 20ms timeout aligns with MCU internal oscillator stabilization. Use Value: 3μA supply current enables >5-year shelf life; 2.40V threshold matches LiMnO₂ battery end-of-life voltage. |
Use Scenario: Under-dash lighting controller exposed to load-dump transients and wide ambient temperature swings. IC Role / Device Role / Timing Role: Monitors 5V system rail and holds microcontroller in reset during cold-crank voltage dip below 2.40V. Use Value: -40°C to +125°C operation and ±2.5% threshold accuracy ensure consistent behavior across vehicle lifetime. |
| Industrial PLC I/O Submodules | Smart Energy Meters |
|
Use Scenario: DIN-rail mounted analog input module powered from isolated 3.3V DC-DC converter with variable startup time. IC Role / Device Role / Timing Role: Provides clean power-on reset independent of converter soft-start profile; open-drain output interfaces directly to 3.3V FPGA reset pin. Use Value: 20ms minimum timeout exceeds worst-case converter ramp time; VCC = 1V operation prevents metastability during brownout recovery. |
Use Scenario: Revenue-grade electricity meter with dual-supply architecture (3.3V MCU + 5V metrology ADC) requiring coordinated reset timing. IC Role / Device Role / Timing Role: Supervises 3.3V rail and drives shared reset bus; open-drain output allows OR-ing with secondary supervisor on 5V rail. Use Value: Factory-set 2.40V threshold avoids design-in tolerance stack-up; SC70 package saves space on crowded meter PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR24D2+T | Same 2.40V threshold and 20ms timeout, but push-pull active-low output; higher ICC (7μA typ at +1.8V) | Requires no external pullup; less suitable for wired-OR buses or level-shifting | Select when board layout lacks space for pullup resistor or system uses single-rail logic |
| TPS3808G125DBVR | 2.45V threshold (±0.5% initial accuracy), 20ms timeout, push-pull active-low; 1.6μA ICC at +1.8V | Tighter threshold tolerance but narrower operating range (1.3V to 6.5V); no AEC-Q100 qualification | Select when highest threshold precision is required and automotive qualification is not mandatory |
Compared with MAX6326XR24D2+T and TPS3808G125DBVR, the MAX6381XR24D2+T offers optimal trade-off between ultra-low current (3μA), AEC-Q100 compliance, and open-drain flexibility - making it preferred for battery-sensitive automotive and industrial designs where bus sharing or voltage translation is needed.
Availability
MAX6381XR24D2+T 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 MAX6381XR24D2+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 demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers single/dual voltage supervision with ultra-low ICC and AEC-Q100 qualification - engineered specifically for power-critical embedded systems needing guaranteed reset integrity under brownout and transient conditions.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6381XR24D2+T?
The MAX6381XR24D2+T has a factory-set nominal reset threshold of 2.40V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. This value is confirmed in the Reset Thresholds table (suffix "24") and Electrical Characteristics section, where VTH min/max values are specified as 2.34V/2.46V at +25°C and 2.31V/2.46V across temperature.
Does MAX6381XR24D2+T include a manual reset input (MR) or auxiliary RESET IN pin?
No, the MAX6381XR24D2+T does not include MR or RESET IN functionality. As confirmed by the Selector Guide and Pin Configurations, only MAX6384–MAX6386 and MAX6390 feature MR, while MAX6387–MAX6389 provide RESET IN. The MAX6381XR24D2+T is a basic single-supply supervisor with RESET, VCC, and GND pins only.
What is the maximum supply voltage and absolute ratings for MAX6381XR24D2+T?
The MAX6381XR24D2+T operates from +1.0V to +5.5V and tolerates VCC up to +6.0V per Absolute Maximum Ratings. The RESET pin (open-drain) withstands voltages from -0.3V to +6.0V, enabling safe interfacing with higher-voltage logic families when used with appropriate pullup resistors.
How does the 20ms reset timeout of MAX6381XR24D2+T behave during VCC recovery?
The MAX6381XR24D2+T guarantees a minimum 20ms reset assertion period after VCC rises above the 2.40V threshold, regardless of VCC ramp rate. This is verified in the Electrical Characteristics table under tRP for suffix "D2", and ensures sufficient hold time for microcontroller internal clocks and memory initialization before release.
Is MAX6381XR24D2+T qualified for automotive applications?
Yes, the MAX6381XR24D2+T is AEC-Q100 qualified for automotive use, as explicitly stated in the Features section and Ordering Information. Its -40°C to +125°C operating temperature range, ±2.5% threshold accuracy over that range, and transient immunity make it suitable for under-hood and cabin electronics.
MAX6381XR24D2+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.4V
- 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
MAX6381XR24D2+T FAQ
1.How can I place an order for MAX6381XR24D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR24D2+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 MAX6381XR24D2+T reliable?
The price and inventory of MAX6381XR24D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR24D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR24D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR24D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR24D2+T?
MAX6381XR24D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR24D2+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 MAX6381XR24D2+T?
For technical support, including MAX6381XR24D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR24D2+T requirements.
6.How does Aetrix verify that MAX6381XR24D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR24D2+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 MAX6381XR24D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR24D2+T?
All MAX6381XR24D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR24D2+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 MAX6381XR24D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR24D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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