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Analog Devices Inc./Maxim Integrated MAX6381XR27D3
- Part No.:
- MAX6381XR27D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR27D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:890
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Product details
Overview
MAX6381XR27D3 from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with factory-set 2.70V 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 supplies in portable battery-powered equipment and embedded controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR27D3 datasheet, MAX6381XR27D3 pinout, MAX6381XR27D3 application, or MAX6381XR27D3 equivalent, this page delivers verified electrical parameters, SC70-3 package mapping, reset timing behavior under temperature variation, manual reset compatibility (not applicable), and validated alternatives for voltage-monitoring reset IC selection.
Technical Context
The MAX6381XR27D3 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion period after VCC rises above 2.70V, independent of supply ramp rate.
This device uses an open-drain RESET output requiring an external pull-up resistor, supports negative-going VCC transient immunity up to 35µs at 100mV overdrive, and guarantees valid logic state for VCC ≥ 1.0V - enabling robust reset signaling during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.70V (factory-set, ±2.5% over –40°C to +125°C) - defines precise power-fail detection point for 2.7V–2.8V supply rails |
| Reset Timeout Period | 140ms (minimum) - ensures µP remains held in reset long enough for stable clock and memory initialization |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion during deep undervoltage down to 1.0V before complete power collapse |
| Output Type | Active-low open-drain - allows wired-OR configuration and level translation via external pull-up |
| Reset Propagation Delay | 35µs (VCC falling at 10mV/µs) - provides fast response to abrupt supply dips without false triggering |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6381XR27D3 is housed in a 3-pin SC70-3 package (package code X3-2), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and lead-free finish. Pin 1 = RESET (active-low open-drain), Pin 2 = VCC, Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | RESET | Active-low open-drain output - requires external pull-up; asserts low during reset condition and floats high otherwise |
| Pin 2 | VCC | Main supply input and monitored voltage source - powers internal circuitry and sets primary reset threshold |
| Pin 3 | GND | Analog and digital ground reference - must be connected directly to system ground plane for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.70V with ±2.5% tolerance across full temperature range - eliminates external resistor divider and calibration effort |
| Ultra-low quiescent current | 3µA at 1.8V - reduces standby power in battery-critical systems such as IoT sensors and wearables |
| Guaranteed reset validity | Operates correctly down to VCC = 1.0V - ensures deterministic reset assertion even during severe brownout |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Open-drain output architecture | Enables flexible voltage-level translation and multi-source reset bus sharing without contention |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor with ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Supervises 2.7V LDO output to ensure clean power-on reset and detect battery sag below safe operating voltage. Use Value: 140ms timeout guarantees full ADC calibration and EEPROM integrity check before firmware execution begins. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V DC input and 3.3V logic rail. IC Role / Device Role / Timing Role: Monitors 3.3V core supply to prevent CPU lockup during field-induced transients on 24V bus. Use Value: Open-drain RESET output interfaces directly to optocoupled reset input of main controller, eliminating level-shifter components. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Under-dash BCM managing door locks, lighting, and CAN communication powered by 5V buck converter. IC Role / Device Role / Timing Role: Detects 5V rail collapse during cold-crank events and asserts reset until stable post-cranking voltage is restored. Use Value: –40°C to +125°C rating and ±2.5% threshold accuracy ensure reliable operation across engine bay thermal extremes. |
Use Scenario: Revenue-grade electricity meter with real-time clock, metrology ASIC, and RF mesh communication. IC Role / Device Role / Timing Role: Supervises 3.0V backup supply feeding RTC and nonvolatile memory during main AC loss. Use Value: 3µA supply current extends supercapacitor hold-up time by >20% versus higher-current alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326LTR27D3 | Same 2.70V threshold and 140ms timeout, but push-pull active-low output; no open-drain capability | Requires dedicated reset line (no wired-OR); unsuitable where multiple supervisors share one reset bus | Select when board layout lacks space for pull-up resistor or when driving capacitive loads >100pF |
| TPS3808G125DBVR | 2.5V threshold (not 2.7V); 200ms timeout (not 140ms); 1.8V–6.0V operating range; 1.6µA typical ICC | Lower threshold better suited for 2.5V systems; longer timeout may delay boot sequence unnecessarily in 2.7V designs | Select only if redesign accommodates 2.5V trip point and extended reset hold time |
Compared with MAX6326LTR27D3 and TPS3808G125DBVR, the MAX6381XR27D3 uniquely combines 2.70V precision threshold, 140ms timing, open-drain output, and sub-µA quiescent current in SC70-3 - making it optimal for space-constrained, battery-sensitive 2.7V systems requiring shared reset busing.
Availability
MAX6381XR27D3 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 lifecycle support.
Supply support for MAX6381XR27D3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6381–MAX6390 family was designed specifically for low-voltage, low-power microprocessor supervision in battery-operated and thermally demanding applications - emphasizing precision threshold accuracy, nanowatt operation, and compact packaging.
FAQ
What is the exact reset threshold voltage of MAX6381XR27D3?
The MAX6381XR27D3 has a factory-set nominal reset threshold of 2.70V, with guaranteed limits of 2.63V (min) and 2.77V (max) over the full –40°C to +125°C temperature range. This value is laser-trimmed during production and does not require external calibration. The '27' suffix in the part number explicitly denotes the 2.70V threshold variant per Maxim's ordering guide.
Does MAX6381XR27D3 include a manual reset input (MR)?
No, the MAX6381XR27D3 does not feature a manual reset input. Only MAX6384/MAX6385/MAX6386 and MAX6390 variants include MR functionality. The MAX6381XR27D3 is a basic single-supply supervisor with VCC monitoring only - confirmed by its 3-pin SC70 package and absence of MR pin in all pin configurations shown in the datasheet.
What is the function of the open-drain RESET output on MAX6381XR27D3?
The open-drain RESET output on MAX6381XR27D3 actively pulls low during reset assertion and floats high otherwise, requiring an external pull-up resistor to VCC or another logic rail. This architecture enables wired-OR connection of multiple supervisors on a shared reset bus and supports level translation - unlike push-pull outputs which cannot be paralleled without contention.
Can MAX6381XR27D3 operate reliably at VCC = 1.2V?
Yes, the MAX6381XR27D3 guarantees correct reset output logic state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.2V, the device fully meets its 2.70V threshold detection, 140ms timeout, and open-drain VOL ≤ 0.3V specifications - making it suitable for deep brownout recovery in low-voltage systems.
Is MAX6381XR27D3 pin-compatible with MAX809?
Yes, the MAX6381XR27D3 in SC70-3 package is pin-compatible with MAX809 in SOT-23-3, sharing identical pin 1 (RESET), pin 2 (VCC), and pin 3 (GND) assignments. However, MAX809 uses push-pull output and has different threshold options; direct substitution requires verifying output type compatibility and reset timing requirements in the target design.
MAX6381XR27D3 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:
- 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 FAQ
1.How can I place an order for MAX6381XR27D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR27D3 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 reliable?
The price and inventory of MAX6381XR27D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR27D3 is usually 5 days.
3.What payment methods are accepted for MAX6381XR27D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR27D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR27D3?
MAX6381XR27D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR27D3 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?
For technical support, including MAX6381XR27D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR27D3 requirements.
6.How does Aetrix verify that MAX6381XR27D3 is sourced from the original manufacturer or authorized distributors?
All MAX6381XR27D3 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 meets industry standards.
7.What is the process for return or replacement of MAX6381XR27D3?
All MAX6381XR27D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR27D3, 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 part is unused and in its original packaging.
Return procedure for MAX6381XR27D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6381XR27D3 Tags
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MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP120T-315I/TT
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