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Analog Devices Inc./Maxim Integrated MAX6381XR26D3+
- Part No.:
- MAX6381XR26D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR26D3+.pdf
- Description:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:9,053
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Product details
Overview
MAX6381XR26D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.63V reset threshold, 140ms minimum reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors +1.8V to +5.0V supply rails in battery-powered embedded systems, consuming only 3µA at +1.8V.
For engineers reviewing the MAX6381XR26D3+ datasheet, MAX6381XR26D3+ pinout, MAX6381XR26D3+ application, or MAX6381XR26D3+ equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), negative-going transient immunity, SC70-3 package compatibility, and VCC reset timeout timing for reliable power-up sequencing in portable instrumentation and industrial controllers.
Technical Context
The MAX6381XR26D3+ integrates a precision voltage comparator referenced to an internal bandgap, a temperature-compensated reset timer (60ppm/°C tempco), and an open-drain output stage capable of sinking 80µA at VCC ≥ 1.0V while maintaining valid logic state. Its reset assertion is triggered solely by VCC falling below 2.63V (min), with no auxiliary input or manual reset functionality.
This variant belongs to the MAX6381–MAX6390 family's base supervisory tier: single-supply monitoring only, no MR pin, no RESET IN, and fixed reset threshold. It lacks debounced manual reset and dual-voltage monitoring features found in higher-numbered variants like MAX6384 or MAX6387.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (nominal), ±2.5% over –40°C to +125°C - ensures stable brownout detection across automotive and industrial temperature ranges. |
| Reset Timeout | 140ms (minimum) - guarantees µP remains held in reset long enough for full power stabilization before release. |
| 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 operation during deep brownout and validates reset output down to near-dead-battery conditions. |
| Output Type | Active-low open-drain - requires external pullup; compatible with mixed-voltage I/O domains and wired-OR reset bus architectures. |
| Temp Range | –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and high-reliability embedded applications. |
| Package | 3-pin SC70 (X3-2) - 1.25mm × 0.85mm footprint ideal for space-constrained wearables and IoT edge nodes. |
Pinout & Package
MAX6381XR26D3+ uses the 3-pin SC70-3 package (pkg code X3-2), measuring 1.25mm × 0.85mm × 0.55mm with gull-wing leads. Pin 1 = RESET (active-low open-drain), Pin 2 = VCC, Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | RESET (open-drain) | Asserts low when VCC < 2.63V; requires external pullup resistor; sinks ≥80µA at VCC ≥ 1.0V. |
| Pin 2 | VCC | Main supply input and monitored voltage rail; powers internal circuitry and defines reset threshold reference point. |
| Pin 3 | GND | Analog and digital ground reference; must be low-impedance connection to avoid false resets during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.63V ±2.5% over full temperature range - eliminates need for external resistor dividers or calibration in production. |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs wide at 100mV overdrive - prevents spurious resets in electrically noisy environments. |
| Ultra-low quiescent current | 3µA at +1.8V - reduces battery drain by >90% versus legacy reset ICs, extending shelf life of sealed devices. |
| Valid reset output down to VCC = 1.0V | Guaranteed logic state integrity through final stages of power collapse - critical for fail-safe shutdown in safety-critical systems. |
| SC70-3 package compatibility | Pins match industry-standard MAX809 footprint - enables drop-in replacement without PCB redesign in legacy designs. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch operating from coin-cell battery with intermittent RF transmission. IC Role / Device Role / Timing Role: Monitors core supply during sleep/wake transitions and asserts reset if voltage sags below 2.63V during radio burst. Use Value: 140ms timeout ensures microcontroller completes ADC sampling and data buffering before release; 3µA current extends battery life beyond 3 years. |
Use Scenario: DIN-rail mounted analog input module exposed to 24VDC field wiring with inductive kickback. IC Role / Device Role / Timing Role: Detects brownout on 3.3V logic rail caused by shared power supply sag during solenoid actuation. Use Value: ±2.5% threshold accuracy prevents nuisance resets during nominal 5% line variation; open-drain output interfaces directly to 5V-tolerant FPGA reset pin. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Door module powered from vehicle battery with cold-cranking voltage dip to 6V. IC Role / Device Role / Timing Role: Supervises 1.8V microcontroller supply derived from buck converter; asserts reset during cranking-induced brownout. Use Value: Valid operation down to VCC = 1.0V ensures deterministic reset behavior even as input drops below regulator dropout; –40°C to +125°C rating covers under-hood thermal extremes. |
Use Scenario: Revenue-grade meter with tamper-detection circuitry requiring guaranteed boot integrity after power interruption. IC Role / Device Role / Timing Role: Provides clean, glitch-free reset signal to ARM Cortex-M0 during AC mains dropout and capacitor hold-up decay. Use Value: 140ms timeout aligns with typical 100–200ms hold-up time of bulk capacitors; SC70-3 footprint saves space on dense meter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.63V threshold, 240ms timeout, push-pull active-low output, same SC70-3 package | Lacks open-drain flexibility; cannot share reset bus with other devices; higher ICC (12µA) | Select when board uses dedicated reset line and lowest possible BOM count is required. |
| TPS3808G33DBVR | 3.3V threshold (not 2.63V), 200ms timeout, open-drain active-low, SOT-23-5 package | Requires different PCB footprint; higher threshold unsuitable for 2.8V or 3.0V systems; 1.5µA ICC at 3.3V | Select only if system operates at 3.3V nominal and layout allows SOT-23-5 placement. |
Compared with MAX6381XR26D3+, MAX809TRD3+T offers simpler drive but less system-level flexibility, while TPS3808G33DBVR trades threshold accuracy and package compatibility for ultra-low current - neither matches the precise 2.63V/140ms/SC70-3/open-drain combination of the MAX6381XR26D3+.
Availability
MAX6381XR26D3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6381XR26D3+ 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 communications applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 product line delivers single- and dual-supply microprocessor supervisory circuits optimized for battery-powered and thermally harsh environments where reset accuracy, ultra-low current, and small footprint are critical.
FAQ
What is the exact reset threshold voltage of MAX6381XR26D3+?
The MAX6381XR26D3+ has a factory-set nominal reset threshold of 2.63V, with a guaranteed range of 2.56V (min) to 2.69V (max) over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed during production and does not require external components to set.
Does MAX6381XR26D3+ support manual reset functionality?
No, MAX6381XR26D3+ does not include a manual reset (MR) input. It is a basic single-supply supervisory device with only VCC monitoring. Manual reset capability is present only in variants such as MAX6384, MAX6385, MAX6386, and MAX6390 - not in the MAX6381 series.
What is the minimum VCC voltage at which MAX6381XR26D3+ guarantees correct reset output logic state?
MAX6381XR26D3+ guarantees valid reset output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain defined behavior; however, the device continues to assert reset until VCC rises above 2.63V, ensuring safe microprocessor initialization during recovery.
Can MAX6381XR26D3+ monitor a second voltage rail?
No, MAX6381XR26D3+ monitors only the VCC supply rail. Auxiliary voltage monitoring via the RESET IN pin is exclusive to MAX6387, MAX6388, MAX6389, and certain MAX6390 configurations - not supported by the MAX6381 series.
What package type and dimensions does MAX6381XR26D3+ use?
MAX6381XR26D3+ uses the 3-pin SC70 package (pkg code X3-2), with dimensions of 1.25mm × 0.85mm × 0.55mm and gull-wing leads. It is RoHS-compliant and pin-compatible with industry-standard MAX809 reset ICs, enabling direct replacement in existing layouts.
MAX6381XR26D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR26D3+ FAQ
1.How can I place an order for MAX6381XR26D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR26D3+ 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 MAX6381XR26D3+ reliable?
The price and inventory of MAX6381XR26D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D3+ is usually 5 days.
3.What payment methods are accepted for MAX6381XR26D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR26D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR26D3+?
MAX6381XR26D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR26D3+ 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 MAX6381XR26D3+?
For technical support, including MAX6381XR26D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D3+ requirements.
6.How does Aetrix verify that MAX6381XR26D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6381XR26D3+ 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 MAX6381XR26D3+ meets industry standards.
7.What is the process for return or replacement of MAX6381XR26D3+?
All MAX6381XR26D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D3+, 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 MAX6381XR26D3+ part is unused and in its original packaging.
Return procedure for MAX6381XR26D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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