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Analog Devices Inc./Maxim Integrated MAX6381XR26D2+T
- Part No.:
- MAX6381XR26D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR26D2+T.pdf
- Description:
- IC MPU/RESET CIRC 2.63V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
MAX6381XR26D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.63V reset threshold, 20ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors single supply voltage in battery-powered embedded systems, portable instruments, and industrial controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR26D2+T datasheet, MAX6381XR26D2+T pinout, MAX6381XR26D2+T application, or MAX6381XR26D2+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, SC70-3 package footprint, and guaranteed reset validity at VCC ≥ 1V.
Technical Context
The MAX6381XR26D2+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 20ms minimum reset assertion period after VCC rises above 2.63V.
No manual reset input or auxiliary voltage monitor is present - this variant is a minimal-function, single-supply reset detector optimized for space-constrained applications where only VCC supervision is required and open-drain output compatibility with legacy reset buses is essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (±2.5% over –40°C to +125°C); ensures reliable detection of 2.5V–2.7V supply brownout |
| Reset Timeout | 20ms minimum; guarantees μP remains held in reset long enough for stable clock and supply settling |
| Supply Current | 3μA at VCC = 1.8V; enables multi-year battery life in always-on monitoring nodes |
| Operating Voltage | 1.0V to 5.5V; supports valid reset assertion even during deep discharge of Li-ion or coin-cell sources |
| Output Type | Active-low open-drain; requires external pullup, enabling wired-OR reset bus configuration |
| Temperature Range | –40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| Reset Propagation Delay | 35μs (VCC falling at 10mV/µs); fast response to rapid supply collapse |
Pinout & Package
MAX6381XR26D2+T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, with lead(Pb)-free/RoHS-compliant finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks up to 3.2mA at VCC ≥ 4.5V; requires external pullup resistor |
| 2 | VCC | Main supply input and monitored voltage source; accepts 1.0V–5.5V; powers internal circuitry and reset comparator |
| 3 | GND | Analog/digital ground reference; must be connected directly to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.63V with ±2.5% tolerance over full temperature range eliminates need for external resistor divider calibration |
| Ultra-low quiescent current | 3μA at 1.8V enables integration into energy-harvesting and coin-cell-powered devices without compromising runtime |
| Valid reset output down to VCC = 1.0V | Ensures deterministic μP reset state during deep brownout, preventing undefined instruction execution |
| Negative-going transient immunity | Rejects sub-100μs VCC glitches up to 200mV below threshold, reducing false resets in noisy power environments |
| Open-drain output architecture | Supports multi-source reset bus sharing and level translation across mixed-voltage systems (e.g., 3.3V logic driving 5V reset line) |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG sensor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output; asserts open-drain RESET to MSP430F5xx MCU on supply dip below 2.63V. Use Value: 3μA supply current extends battery life beyond 3 years; 20ms timeout ensures clean MCU boot after wake-up from deep sleep. | Use Scenario: DIN-rail mounted analog input module operating in factory ambient (–25°C to +70°C). IC Role / Device Role / Timing Role: Monitors 5.0V system rail; drives shared reset bus via 10kΩ pullup to 5V; holds ARM Cortex-M4 in reset during 12V-to-5V converter startup. Use Value: ±2.5% threshold accuracy prevents spurious resets during thermal cycling; –40°C to +125°C rating covers extended industrial temperature margin. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: BCM sub-module powered from vehicle's 3.3V domain, subject to load-dump transients and cold-crank voltage sag. IC Role / Device Role / Timing Role: Detects VCC drop below 2.63V during cranking; asserts RESET to Infineon AURIX TC3xx; immune to <100μs negative spikes per spec. Use Value: Open-drain output interfaces safely with 5V CAN transceiver reset input; AEC-Q100 qualified version available (MAX6381XR26D2/V+T). | Use Scenario: ANSI C12.22-compliant meter with dual-rail power (3.3V MCU, 1.8V RTC) and tamper-detection circuitry. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V rail; provides 20ms reset hold time to synchronize RTC initialization and secure boot sequence. Use Value: Guaranteed reset validity down to VCC = 1.0V ensures safe shutdown during battery backup switchover; SC70-3 footprint saves PCB area in sealed meter housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | Same 2.63V threshold and 20ms timeout, but push-pull active-low output; no open-drain capability | Requires dedicated reset line; incompatible with wired-OR bus topologies | Select when board layout lacks space for external pullup or system uses single-source reset only |
| TPS3808G12DBVR | 2.63V threshold, 20ms timeout, open-drain output; higher 8μA ICC at 1.8V; supports enable pin | Includes EN input for power-gating control; not qualified to AEC-Q100 | Select when system requires programmable reset enable/disable or higher drive strength (8mA sink) |
Compared with MAX6381XR26D2+T, MAX809TRD2+T offers simpler interface but lacks bus-sharing flexibility, while TPS3808G12DBVR adds control features at the cost of higher current and no automotive qualification - making MAX6381XR26D2+T optimal for space-, power-, and reliability-constrained wired-OR reset applications.
Availability
MAX6381XR26D2+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 and long-term production continuity.
Supply support for MAX6381XR26D2+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 industrial, automotive, communications, and computing markets.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for battery-operated and harsh-environment systems where deterministic power-on behavior and long-term reliability are critical.
FAQ
What is the exact reset threshold voltage of MAX6381XR26D2+T and how tightly is it specified?
The MAX6381XR26D2+T has a nominal reset threshold of 2.63V, with a guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This means the actual threshold falls between 2.56V and 2.69V at any temperature within that range, ensuring robust brownout detection without external calibration. The MAX6381XR26D2+T achieves this using factory laser trimming of an internal bandgap reference.
Does MAX6381XR26D2+T support manual reset functionality?
No, the MAX6381XR26D2+T does not include a manual reset (MR) input. It is a minimal-feature variant in the MAX6381–MAX6390 family designed exclusively for VCC-only supervision with open-drain output. For manual reset capability, consider MAX6384XR26D2+T (active-low push-pull) or MAX6390XR26D2+T (open-drain with MR), both sharing the same 2.63V/20ms configuration but adding the MR pin.
Can MAX6381XR26D2+T operate reliably when VCC drops below 1.8V?
Yes, the MAX6381XR26D2+T is fully functional and guarantees correct reset output behavior down to VCC = 1.0V. Its internal circuitry remains active and the open-drain RESET output maintains valid logic states (high-impedance or pulled low) even at 1.0V supply - a key feature for applications involving deeply discharged batteries or ultra-low-voltage systems. This is explicitly verified in the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables.
What package type and dimensions does MAX6381XR26D2+T use?
MAX6381XR26D2+T is supplied in a 3-pin SC70 package (outline number 21-0075), measuring 2.0mm × 2.1mm × 0.95mm with a 0.65mm pitch. It features RoHS-compliant, lead(Pb)-free terminations and is compatible with standard reflow soldering profiles (peak 260°C). The land pattern is documented as 90-0208 on Maxim's packaging site.
Is MAX6381XR26D2+T qualified for automotive applications?
The base MAX6381XR26D2+T is not automotive-qualified; however, the functionally identical automotive-grade variant MAX6381XR26D2/V+T is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) operation. Both share identical electrical specifications and SC70-3 packaging, differing only in test documentation and traceability - the /V suffix denotes automotive qualification and is required for automotive production programs.
MAX6381XR26D2+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:
- 2.63V
- 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
MAX6381XR26D2+T FAQ
1.How can I place an order for MAX6381XR26D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR26D2+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 MAX6381XR26D2+T reliable?
The price and inventory of MAX6381XR26D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR26D2+T?
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4.How is shipping managed for MAX6381XR26D2+T?
MAX6381XR26D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR26D2+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 MAX6381XR26D2+T?
For technical support, including MAX6381XR26D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D2+T requirements.
6.How does Aetrix verify that MAX6381XR26D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR26D2+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 MAX6381XR26D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR26D2+T?
All MAX6381XR26D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D2+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 MAX6381XR26D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR26D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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