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Analog Devices Inc./Maxim Integrated MAX6381XR27D3+T
- Part No.:
- MAX6381XR27D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR27D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.70V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,069
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Product details
Overview
MAX6381XR27D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set 2.70V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors single-supply voltages from +1.8V to +5.0V with only 3μA supply current at +1.8V and guarantees valid reset state down to VCC = 1V - used in battery-powered instrumentation and embedded controllers requiring reliable power-on reset.
For engineers reviewing the MAX6381XR27D3+T datasheet, MAX6381XR27D3+T pinout, MAX6381XR27D3+T application, or MAX6381XR27D3+T equivalent, key selection criteria include reset threshold accuracy, timeout timing tolerance, open-drain drive capability (3.2mA sink at VCC ≥ 4.5V), and compatibility with 1.8V–5.5V logic domains in space-constrained industrial and portable designs.
Technical Context
The MAX6381XR27D3+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over temperature and 60ppm/°C tempco, paired with a temperature-stable RC timer for deterministic 140ms reset assertion after VCC recovery. Its open-drain RESET output requires an external pullup and remains valid down to VCC = 1V, enabling robust reset signaling even during deep brownout conditions.
No manual reset (MR) input or auxiliary RESET IN is present - this variant belongs to the base MAX6381 series (3-pin SC70, no MR, no dual-monitoring), distinguishing it from MAX6384–MAX6390 variants with MR and MAX6387–MAX6389 with RESET IN. It is AEC-Q100 qualified only in /V-trim versions, not applicable to this standard +T RoHS-compliant part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.70V (nominal), ±2.5% over -40°C to +125°C - ensures accurate detection of 2.7V supply brownout without false triggering. |
| Reset Timeout | 140ms (min) - holds μP in reset long enough for stable clock and supply settling after power-up. |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable meters. |
| Operating Voltage | 1.0V to 5.5V - supports valid reset assertion down to 1V VCC, critical for graceful shutdown sequencing. |
| Output Type | Active-low open-drain - allows wired-OR reset bus sharing and level translation across mixed-voltage systems. |
| Reset Output Sink | 3.2mA at VCC ≥ 4.5V - drives standard 10kΩ pullup to 3.3V or 5V while maintaining VOL ≤ 0.4V. |
| Package | 3-pin SC70 (2.0mm × 2.1mm, 0.5mm pitch) - fits high-density PCB layouts where space is constrained. |
Pinout & Package
MAX6381XR27D3+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not electrically connected. 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 up to 3.2mA when asserted. |
| 2 | VCC | Main supply input (1.0V–5.5V); powers internal comparator and timer; monitored for reset threshold violation. |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to minimize noise-induced false resets. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.70V threshold | Eliminates external resistor divider; reduces BOM count and layout area in fixed-voltage systems. |
| 140ms guaranteed reset timeout | Ensures sufficient hold time for slow-ramping supplies and crystal oscillator startup in μC applications. |
| 3μA supply current at 1.8V | Extends battery life in always-on monitoring nodes without compromising reset reliability. |
| Valid reset down to VCC = 1V | Prevents spurious release during deep undervoltage events, improving system resilience in brownout scenarios. |
| Open-drain output with 3.2mA sink | Enables flexible voltage translation and multi-source reset arbitration on shared reset buses. |
Applications
| Power Monitoring in Portable Instruments | Microcontroller Reset in Industrial Controllers |
|---|---|
Use Scenario: Battery-powered handheld multimeter monitoring Li-ion cell voltage during measurement cycles. IC Role / Device Role / Timing Role: Supervises main 3.3V rail; asserts open-drain RESET until VCC exceeds 2.70V and sustains 140ms timeout post-recovery. Use Value: Prevents firmware crash during battery sag by guaranteeing μC remains held in reset until supply stabilizes - critical for measurement integrity. | Use Scenario: PLC I/O module with isolated 24V-to-3.3V DC-DC converter powering ARM Cortex-M4 core. IC Role / Device Role / Timing Role: Monitors 3.3V domain; provides clean, glitch-immune reset pulse synchronized to power-up sequence. Use Value: Eliminates need for RC-based reset circuits, reducing component count and improving temperature stability of reset timing. |
| Dual-Voltage System Supervision | Low-Power Sensor Node Reset |
Use Scenario: Smart sensor node using separate 1.8V core and 3.3V I/O rails, where only 3.3V rail is monitored. IC Role / Device Role / Timing Role: Single-point supervision of 3.3V rail; open-drain RESET pulled up to 3.3V and interfaced to 1.8V-tolerant μC reset pin via level-shifter or direct connection. Use Value: Simplifies power sequencing by decoupling reset assertion from core voltage rail, avoiding unnecessary resets during core rail transients. | Use Scenario: Wireless environmental sensor powered by CR2032 coin cell, waking every 5 minutes for ADC sampling and BLE transmission. IC Role / Device Role / Timing Role: Provides ultra-low-current (3μA) reset supervision; ensures μC starts cleanly after cold start or brownout from battery depletion. Use Value: Enables >5-year battery life while maintaining deterministic reset behavior - no external components required beyond pullup. |
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 3-pin SC70 package, 2.63V reset threshold (±2%), 140ms timeout, push-pull active-low output. | Lacks open-drain flexibility; cannot share reset bus; higher ICC (15μA typical at 3.6V). | Select when board-level reset is dedicated and lower quiescent current is not critical. |
| TPS3808G33DBVR | 3-pin SOT-23, 3.3V threshold (±0.5%), 200ms timeout, open-drain active-low, 1.5μA ICC at 3.3V. | Higher threshold voltage; tighter accuracy but incompatible with 2.7V rail monitoring; different footprint. | Select when higher accuracy and lower current are prioritized over exact 2.7V threshold match and SC70 compatibility. |
Compared with MAX809TRD3+T, MAX6381XR27D3+T offers lower supply current and open-drain flexibility at the cost of slightly relaxed threshold accuracy; compared with TPS3808G33DBVR, it provides precise 2.70V detection and SC70 footprint compatibility but consumes more current and has looser threshold tolerance.
Availability
MAX6381XR27D3+T is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, low-power sensor nodes, and dual-voltage embedded systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6381XR27D3+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, and communications applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for space- and energy-constrained microprocessor systems - optimized for battery longevity and thermal stability in harsh environments.
FAQ
What is the exact reset threshold voltage of MAX6381XR27D3+T and how tightly is it specified?
The MAX6381XR27D3+T has a nominal reset threshold of 2.70V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This means the actual threshold falls between 2.63V and 2.77V at any temperature within spec, ensuring reliable detection of 2.7V supply faults without false triggers due to drift.
Does MAX6381XR27D3+T include a manual reset input (MR) pin?
No, MAX6381XR27D3+T does not include a manual reset input. It belongs to the base MAX6381 series (3-pin SC70 configuration), which lacks MR functionality. Variants like MAX6384XR27D3+T or MAX6390XR27D3+T add MR, but MAX6381XR27D3+T is strictly a VCC-only supervisory device with RESET and GND pins.
What is the minimum supply voltage at which MAX6381XR27D3+T guarantees correct reset output behavior?
MAX6381XR27D3+T guarantees valid reset output state down to VCC = 1.0V. Below this, the internal circuitry may not function reliably - however, the open-drain RESET output remains functional (sinking current) as long as VCC ≥ 1.0V, enabling safe reset assertion during deep brownout conditions before complete power loss.
Can MAX6381XR27D3+T be used in automotive applications?
MAX6381XR27D3+T itself is not automotive-qualified; it carries the "+T" RoHS-compliant suffix but no "/V" trim. Automotive-grade versions (e.g., MAX6381XR27D3/V+T) are AEC-Q100 qualified and specified for -40°C to +125°C operation with enhanced reliability testing - use those variants for under-hood or infotainment systems requiring automotive certification.
What package type and dimensions does MAX6381XR27D3+T use, and is it compatible with standard reflow profiles?
MAX6381XR27D3+T uses a 3-pin SC70 package (2.0mm × 2.1mm, 0.5mm pitch, outline 21-0075). It is RoHS-compliant (+T suffix) and rated for standard lead-free reflow (peak solder temperature +260°C per JEDEC J-STD-020), with maximum lead temperature of +300°C for 10 seconds - fully compatible with automated SMT assembly lines.
MAX6381XR27D3+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:
- 2.7V
- 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
MAX6381XR27D3+T FAQ
1.How can I place an order for MAX6381XR27D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR27D3+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 MAX6381XR27D3+T reliable?
The price and inventory of MAX6381XR27D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR27D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR27D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR27D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR27D3+T?
MAX6381XR27D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR27D3+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 MAX6381XR27D3+T?
For technical support, including MAX6381XR27D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR27D3+T requirements.
6.How does Aetrix verify that MAX6381XR27D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR27D3+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 MAX6381XR27D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR27D3+T?
All MAX6381XR27D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR27D3+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 MAX6381XR27D3+T part is unused and in its original packaging.
Return procedure for MAX6381XR27D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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