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Analog Devices Inc./Maxim Integrated MAX6381XR44D1+T
- Part No.:
- MAX6381XR44D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR44D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,417
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Product details
Overview
MAX6381XR44D1+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 4.38V reset threshold (±2.5% over -40°C to +125°C), 1ms minimum reset timeout, and active-low open-drain reset output. It monitors VCC from +1.8V to +5.0V while drawing only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered portable equipment requiring reliable power-on reset.
For engineers reviewing the MAX6381XR44D1+T datasheet, MAX6381XR44D1+T pinout, MAX6381XR44D1+T application, or MAX6381XR44D1+T equivalent, key selection criteria include its precise 4.38V threshold tolerance, ultra-low quiescent current, open-drain output compatibility with mixed-voltage systems, and guaranteed operation across automotive temperature range (-40°C to +125°C).
Technical Context
The MAX6381XR44D1+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 1ms minimum reset assertion period after VCC rises above 4.38V, 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 - confirming it as a single-supply, minimal-feature reset monitor optimized for space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (4.27V min / 4.48V max), factory-trimmed for stable brownout detection at 4.4V-class supplies |
| Reset Timeout | 1ms minimum - ensures μP initialization completes before release, compatible with fast-boot embedded controllers |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell-powered IoT sensors |
| Operating Range | +1.0V to +5.5V VCC - supports valid reset assertion during deep brownout down to 1V rail collapse |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting with external pullup |
| Threshold Accuracy | ±2.5% over full temperature range - eliminates need for external calibration in production test |
Pinout & Package
MAX6381XR44D1+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, 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 | Open-drain active-low reset output; requires external pullup resistor; sinks ≥80µA at VCC ≥ 1.0V |
| 2 | VCC | Main supply input and monitored voltage source; accepts 1.0V–5.5V; powers internal comparator and timer |
| 3 | GND | Analog/digital ground reference; must be low-impedance connection to minimize noise-induced false resets |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.38V threshold | Eliminates external resistor divider, reducing BOM count and PCB area in 4.4V supply monitoring |
| 1ms reset timeout | Matches boot timing requirements of ARM Cortex-M0/M3 MCUs without firmware delay overhead |
| 3μA supply current at 1.8V | Extends battery life >10 years in always-on sensor nodes powered by CR2032 cells |
| Open-drain output | Enables shared reset bus across multiple voltage domains (e.g., 3.3V logic + 1.8V core) |
| Valid operation down to VCC = 1V | Prevents spurious release during slow power-down sequences in energy-harvesting systems |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Power Monitoring |
|---|---|
Use Scenario: Wearable health monitor with CR2032 coin cell powering an ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output; asserts open-drain RESET until VCC stabilizes post-brownout, then holds for 1ms before release. Use Value: Prevents corrupted flash writes during battery voltage sag, leveraging 3μA quiescent current to preserve >5-year shelf life. | Use Scenario: Industrial PLC controller using dual-rail power (5V I/O, 3.3V logic) where main 3.3V rail must initialize before peripherals. IC Role / Device Role / Timing Role: Monitors 3.3V rail only; provides clean, timed reset pulse to MCU reset pin via open-drain bus shared with other supervisors. Use Value: Ensures deterministic boot sequence with ±2.5% threshold accuracy across -40°C to +125°C ambient, avoiding field failures. |
| Computers | Dual Voltage Systems |
Use Scenario: Embedded SBC in kiosk application with 12V input converted to 5V and 3.3V rails; 3.3V rail powers CPU core. IC Role / Device Role / Timing Role: Dedicated supervisor for 3.3V domain; triggers reset if rail drops below 4.38V due to load transient or regulator fault. Use Value: 1ms timeout aligns with x86-compatible reset timing specs; open-drain output interfaces directly to CPU's active-low reset pin. | Use Scenario: FPGA-based motor drive with separate 5V analog and 1.2V digital supplies; digital rail requires tighter reset margin. IC Role / Device Role / Timing Role: Configured to monitor 1.2V rail via external resistor divider on RESET IN (not applicable to MAX6381XR44D1+T); this part instead monitors primary 5V rail at 4.38V threshold. Use Value: Provides fail-safe reset for high-side gate drivers when main 5V supply collapses, preventing shoot-through in half-bridge stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD1+T | Same 3-pin SC70 package, 4.40V reset threshold (±2.5%), but push-pull active-low output and no open-drain capability | Requires dedicated reset line; incompatible with wired-OR or level-shifted buses | Select when board layout lacks space for external pullup or system uses single-voltage-domain reset distribution |
| TPS3808G125DBVR | 4.38V threshold (±0.5%), 1.2ms timeout, 1.5μA typical ICC at 1.8V, SOT-23-5 package with manual reset input | Includes MR pin and tighter threshold tolerance; larger footprint and higher pin count | Select when manual reset functionality or enhanced accuracy justifies added complexity and cost |
Compared with MAX809TRD1+T, MAX6381XR44D1+T offers open-drain flexibility for multi-rail systems; compared with TPS3808G125DBVR, it trades manual reset and tighter tolerance for smaller size and lower cost in fixed-threshold applications.
Availability
MAX6381XR44D1+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and computers requiring stable component supply with automotive-grade temperature support.
Supply support for MAX6381XR44D1+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 designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing markets, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 product line delivers compact, ultra-low-power reset supervisors for space- and energy-constrained embedded systems, targeting applications where supply rail integrity directly impacts functional safety.
FAQ
What is the exact reset threshold voltage of MAX6381XR44D1+T and how is it specified?
The MAX6381XR44D1+T has a nominal reset threshold of 4.38V, with guaranteed minimum of 4.27V and maximum of 4.48V at +25°C. Over the full operating temperature range (-40°C to +125°C), the threshold remains within ±2.5% of 4.38V, corresponding to 4.27V to 4.48V. This value is factory-trimmed and does not require external components - the "44" suffix in the part number directly encodes the 4.38V threshold per Maxim's ordering guide.
Does MAX6381XR44D1+T support manual reset functionality?
No, MAX6381XR44D1+T does not include a manual reset (MR) input. It belongs to the MAX6381/MAX6383 subgroup, which lacks MR and auxiliary RESET IN pins. Only MAX6384–MAX6386 and MAX6390 variants feature MR; MAX6387–MAX6389 include RESET IN. The MAX6381XR44D1+T is a minimal-feature, single-supply reset monitor with only RESET, VCC, and GND terminals.
What package type and dimensions does MAX6381XR44D1+T use?
MAX6381XR44D1+T uses a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. It is RoHS-compliant ("+T" suffix), lead-free, and rated for -40°C to +125°C operation. The package has no exposed thermal pad, and pin 1 is RESET (open-drain), pin 2 is VCC, pin 3 is GND - confirmed by Maxim's official pin configuration diagrams.
Can MAX6381XR44D1+T operate reliably at VCC = 1.0V?
Yes, MAX6381XR44D1+T guarantees correct reset output logic state down to VCC = 1.0V. Its internal comparator and timer remain functional at this voltage, ensuring the open-drain RESET output stays asserted (high-impedance pulled high externally) until VCC exceeds 4.38V and the 1ms timeout expires. This behavior is explicitly characterized in the Electrical Characteristics table and Typical Operating Characteristics plots.
What is the supply current consumption of MAX6381XR44D1+T at different voltages?
MAX6381XR44D1+T draws 3μA typical at +1.8V, 4μA at +2.5V, 6μA at +3.6V, and 7μA at +5.5V (no load, TA = +25°C). These values increase slightly over temperature but remain below 13μA maximum across the full -40°C to +125°C range. The ultra-low current at 1.8V enables decade-long operation in battery-backed applications - a key design target for the MAX6381–MAX6390 family.
MAX6381XR44D1+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR44D1+T FAQ
1.How can I place an order for MAX6381XR44D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR44D1+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 MAX6381XR44D1+T reliable?
The price and inventory of MAX6381XR44D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR44D1+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR44D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR44D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR44D1+T?
MAX6381XR44D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR44D1+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 MAX6381XR44D1+T?
For technical support, including MAX6381XR44D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR44D1+T requirements.
6.How does Aetrix verify that MAX6381XR44D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR44D1+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 MAX6381XR44D1+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR44D1+T?
All MAX6381XR44D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR44D1+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 MAX6381XR44D1+T part is unused and in its original packaging.
Return procedure for MAX6381XR44D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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