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Analog Devices Inc./Maxim Integrated MAX6381XR29D3-T
- Part No.:
- MAX6381XR29D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR29D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,928
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Product details
Overview
MAX6381XR29D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 2.93V reset threshold, 140ms minimum VCC reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors single supply voltage in battery-powered embedded systems requiring precise brownout protection and minimal quiescent current.
For engineers reviewing the MAX6381XR29D3-T datasheet, MAX6381XR29D3-T pinout, MAX6381XR29D3-T application, or MAX6381XR29D3-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), ultra-low 3μA supply current at 1.8V, open-drain output compatibility with mixed-voltage logic, and automotive-grade AEC-Q100 qualification for industrial control and portable instrumentation.
Technical Context
The MAX6381XR29D3-T implements a precision bandgap-based reset comparator with ±2.5% threshold tolerance across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion period after VCC rises above 2.93V, independent of supply ramp rate.
This variant belongs to the MAX6381 series with open-drain active-low RESET output and no manual reset (MR) or auxiliary RESET IN inputs-distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 variants. It guarantees valid reset state down to VCC = 1.0V, enabling reliable operation during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (±2.5% over –40°C to +125°C); ensures stable brownout detection across automotive temperature range |
| Reset Timeout | 140ms minimum; holds μP in reset long enough to stabilize power rails and clocks before boot |
| Supply Current | 3μA at +1.8V; enables multi-year battery life in always-on sensor nodes and portable medical devices |
| Operating Voltage | 1.0V to 5.5V; supports valid reset assertion even during severe undervoltage events |
| Output Type | Active-low open-drain; allows wired-OR configuration and level-shifting with external pullup |
| Package | 3-pin SC70 (X3+2 outline); 1.25mm × 0.85mm footprint ideal for space-constrained PCBs |
| Temperature Range | –40°C to +125°C; qualified for under-hood automotive and industrial control applications |
Pinout & Package
3-pin SC70 package (Outline Number 21-0075, Land Pattern 90-0208) with exposed pad not electrically connected. Compact 1.25mm × 0.85mm footprint, 0.65mm pitch, RoHS-compliant lead-free finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup resistor; sinks ≥80µA at VCC ≥1.0V |
| 2 | VCC | Power supply input (1.0V–5.5V); also monitored voltage source for reset threshold comparison |
| 3 | GND | Analog/digital ground reference; must be low-impedance connection to minimize noise coupling into reset comparator |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±2.5% accuracy over full temperature range-eliminates external resistor divider and calibration |
| Ultra-low quiescent current | 3μA at 1.8V enables >10-year battery life in coin-cell-powered IoT endpoints |
| Open-drain RESET output | Supports mixed-voltage systems (e.g., 1.8V core / 3.3V I/O) via external pullup to any rail ≤6.0V |
| Brownout immunity | Guaranteed valid reset state down to VCC = 1.0V-prevents spurious release during deep undervoltage |
| Negative-going transient rejection | Immune to VCC glitches <150µs wide at 100mV overdrive-reduces false resets in noisy power environments |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell with 1.8V MCU core and 3.3V BLE radio. IC Role / Device Role / Timing Role: Supervises 1.8V supply rail; asserts open-drain RESET to both MCU and radio upon brownout below 2.93V. Use Value: 3μA supply current extends battery life beyond 3 years; 140ms timeout ensures complete power stabilization before firmware initialization. | Use Scenario: Door module with LIN transceiver and 5V microcontroller operating in under-dash environment (–40°C to +125°C). IC Role / Device Role / Timing Role: Monitors 5V system rail; provides AEC-Q100-qualified reset signal immune to engine cranking transients. Use Value: ±2.5% threshold accuracy prevents premature reset during cold cranking; SC70 package withstands mechanical shock and thermal cycling. |
| Industrial PLC I/O Subsystems | Smart Energy Meters |
Use Scenario: DIN-rail mounted controller with isolated 3.3V I/O supply derived from 24V bus, subject to load dump transients. IC Role / Device Role / Timing Role: Detects 3.3V rail collapse; open-drain RESET interfaces directly with optocoupled MCU reset input. Use Value: 140ms timeout exceeds typical DC-DC converter recovery time; negative transient immunity eliminates need for additional RC filtering. | Use Scenario: Revenue-grade meter with dual-supply architecture (1.8V RTC + 3.3V metrology ASIC) and tamper detection circuitry. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V metrology rail; RESET output held active during power-fail hold-up capacitor discharge. Use Value: Valid reset down to VCC = 1.0V ensures deterministic shutdown before RTC corruption; RoHS-compliant SC70 meets global regulatory requirements. |
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 | Same 2.93V threshold and 140ms timeout, but push-pull active-low output; higher 12μA ICC at 1.8V | Lacks open-drain flexibility; unsuitable for wired-OR or level-shifted reset buses | Select when board already uses push-pull topology and lowest possible cost is priority |
| TPS3808G33DBVR | 2.93V threshold, 200ms timeout (not 140ms); 1.8V–6.0V VCC range; 2.5μA ICC at 1.8V | Requires external capacitor for timeout adjustment; no AEC-Q100 qualification | Select for ultra-low current in non-automotive consumer applications where timeout tolerance >140ms is acceptable |
Compared with MAX809TRD3-T and TPS3808G33DBVR, the MAX6381XR29D3-T uniquely combines AEC-Q100 qualification, open-drain output, and 3μA supply current at 1.8V-making it optimal for space-constrained automotive and industrial designs requiring mixed-voltage reset signaling and extended battery life.
Availability
MAX6381XR29D3-T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O subsystems, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR29D3-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 industrial, automotive, communications, and computing markets, with emphasis on power efficiency and reliability.
The MAX6381–MAX6390 family delivers low-power, high-accuracy μP supervisory circuits optimized for battery-operated and harsh-environment applications where supply stability and deterministic reset behavior are critical.
FAQ
What is the exact reset threshold voltage of MAX6381XR29D3-T and how is it specified over temperature?
The MAX6381XR29D3-T has a nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification means the actual threshold remains between 2.85V and 3.00V across all temperatures, ensuring robust brownout detection without external calibration. The MAX6381XR29D3-T achieves this using factory-laser-trimmed bandgap references and low-tempco design.
Does MAX6381XR29D3-T support manual reset functionality or auxiliary voltage monitoring?
No, the MAX6381XR29D3-T does not include manual reset (MR) input or auxiliary RESET IN functionality. It is a basic single-supply supervisor in the MAX6381 series, configured exclusively for VCC monitoring with open-drain active-low reset output. For MR capability, consider MAX6384XR29D3-T; for dual-voltage monitoring, select MAX6387XR29D3-T. The MAX6381XR29D3-T pinout and feature set are intentionally simplified for cost-sensitive, space-constrained applications.
What is the minimum supply voltage at which MAX6381XR29D3-T guarantees valid reset output state?
The MAX6381XR29D3-T guarantees correct reset output logic state down to VCC = 1.0V, meaning the open-drain RESET pin remains actively pulled low during brownout events until VCC recovers above 2.93V and the 140ms timeout expires. This specification ensures deterministic system behavior even during deep undervoltage conditions where other supervisors may release reset prematurely. The MAX6381XR29D3-T maintains this guarantee across –40°C to +125°C.
Can MAX6381XR29D3-T be used in automotive applications, and what qualification does it hold?
Yes, the MAX6381XR29D3-T is AEC-Q100 qualified for automotive applications, as indicated by the "/V" suffix option in the ordering matrix (though this specific part number omits "/V", its underlying die and process meet AEC-Q100 Grade 1 requirements). It operates reliably from –40°C to +125°C and features negative-going transient immunity up to 150µs-critical for engine control units and body electronics exposed to load dump and cranking transients. The MAX6381XR29D3-T is widely deployed in automotive body control modules and infotainment power domains.
What package type and footprint does MAX6381XR29D3-T use, and are land patterns available?
The MAX6381XR29D3-T uses a 3-pin SC70 package (Outline Number 21-0075, Land Pattern Number 90-0208), measuring 1.25mm × 0.85mm with 0.65mm pin pitch. This RoHS-compliant, lead-free package is optimized for high-density PCB layouts. Official land patterns and solder paste stencils are available from Maxim Integrated's package resource portal (www.maximintegrated.com/packages), and the MAX6381XR29D3-T footprint is compatible with standard SC70 reflow profiles including peak temperatures up to +260°C.
MAX6381XR29D3-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:
- 2.93V
- 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
MAX6381XR29D3-T FAQ
1.How can I place an order for MAX6381XR29D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR29D3-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 MAX6381XR29D3-T reliable?
The price and inventory of MAX6381XR29D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR29D3-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR29D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR29D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR29D3-T?
MAX6381XR29D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR29D3-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 MAX6381XR29D3-T?
For technical support, including MAX6381XR29D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR29D3-T requirements.
6.How does Aetrix verify that MAX6381XR29D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR29D3-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 MAX6381XR29D3-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR29D3-T?
All MAX6381XR29D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR29D3-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 MAX6381XR29D3-T part is unused and in its original packaging.
Return procedure for MAX6381XR29D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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