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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:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
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Product details
Overview
MAX6381XR27D3+ from Maxim Integrated is a low-power 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 single supply voltage in portable/battery-powered systems and embedded controllers requiring precise brownout detection and ultra-low quiescent current (3µA at 1.8V).
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 notes, and validated alternative parts for design continuity.
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 recovers above 2.70V.
This variant belongs to the MAX6381–MAX6390 family's 3-pin SC70 configuration and features an open-drain RESET output requiring external pull-up, no MR input, and no auxiliary RESET IN-distinguishing it from MAX6384/MAX6387 series variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.70V (factory-set, ±2.5% over –40°C to +125°C) - ensures reliable brownout detection at core logic supply levels. |
| Reset Timeout Period | 140ms minimum - guarantees µP initialization completes before release of reset signal. |
| Supply Current | 3µA at VCC = 1.8V - enables multi-year battery life in always-on monitoring applications. |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions. |
| Output Type | Active-low open-drain - allows wired-OR configuration and level translation with external pull-up. |
| Reset Output Validity | Guaranteed down to VCC = 1.0V - maintains deterministic logic state during power collapse. |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
MAX6381XR27D3+ uses the 3-pin SC70-3 (X3-2) package: 0.65mm pitch, 1.25mm × 0.85mm footprint, 0.8mm max height. Pin 1 = VCC, Pin 2 = RESET (open-drain), Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | VCC | Primary supply input and monitored voltage source - powers internal circuitry and sets reset trigger point. |
| Pin 2 | RESET | Active-low open-drain output - requires external pull-up resistor; asserts low during VCC undervoltage or fault. |
| Pin 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 | 2.70V with ±2.5% tolerance across full temperature range - eliminates external resistor network calibration. |
| Ultra-low supply current | 3µA at 1.8V - reduces standby power in energy-constrained IoT sensor nodes and wearables. |
| Open-drain RESET output | Supports multi-source reset bus sharing and voltage-level translation up to 5.5V - simplifies integration with mixed-voltage SoCs. |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches below reset threshold - prevents spurious resets in electrically noisy environments. |
| Valid reset down to VCC = 1.0V | Ensures deterministic state during rapid power collapse - critical for fail-safe shutdown in safety-critical systems. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor with ARM Cortex-M0+ MCU operating from 2.8V Li-ion cell. IC Role / Device Role / Timing Role: Monitors VCC and asserts open-drain RESET to hold MCU in reset until stable 2.70V supply is confirmed post-power-up. Use Value: 3µA quiescent current extends battery life beyond 3 years; 140ms timeout ensures complete flash initialization before firmware execution. |
Use Scenario: DIN-rail mounted analog input module with isolated 3.3V logic rail powered from 24V DC bus. IC Role / Device Role / Timing Role: Detects brownout on 3.3V rail and forces controlled reset of FPGA-based data acquisition engine. Use Value: ±2.5% threshold accuracy prevents false resets during nominal 3.3V ripple; open-drain output interfaces directly with FPGA reset pin. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Door module MCU supplied from vehicle battery via LDO, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Provides robust VCC supervision with glitch immunity to suppress resets during <10µs negative spikes. Use Value: Valid operation down to 1.0V ensures reset remains asserted through cold-crank voltage sag to 6V; 125°C rating supports under-dash placement. |
Use Scenario: Revenue-grade electricity meter with dual-supply architecture (3.3V MCU + 5.0V RTC/sensor rail). IC Role / Device Role / Timing Role: Supervises primary 3.3V rail and coordinates safe shutdown sequence when mains power fails. Use Value: 140ms timeout aligns with EEPROM write cycle time; SC70-3 footprint minimizes PCB area in space-constrained meter housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326TAKD3+T | Same 2.7V threshold and 140ms timeout, but in SOT23-3 package with push-pull active-low output. | Requires PCB redesign due to different pinout and drive strength; no external pull-up needed. | Select when board layout allows SOT23-3 and push-pull drive simplifies BOM. |
| TPS3123E18DBVR | 2.7V threshold, 200ms timeout, 1.8V–5.5V range, 1.6µA ICC at 1.8V, open-drain output. | Lower supply current but longer timeout; TI qualification for extended temperature not identical. | Prefer for ultra-low-power designs where 60ms longer reset window is acceptable. |
Compared with MAX6381XR27D3+, MAX6326TAKD3+T offers integrated push-pull drive eliminating external components but demands layout change, while TPS3123E18DBVR reduces current by 47% at cost of timing margin and automotive qualification scope.
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 across extended temperature ranges and long production lifecycles.
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) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
MAX6381XR27D3+ belongs to the MAX6381–MAX6390 family of low-power µP supervisory circuits engineered for battery-operated and thermally harsh systems requiring guaranteed reset behavior across wide voltage and temperature extremes.
FAQ
What is the exact reset threshold voltage of MAX6381XR27D3+?
The MAX6381XR27D3+ has a factory-set reset threshold of 2.70V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during production and documented in the Reset Thresholds table of the official datasheet. The '27' suffix in MAX6381XR27D3+ explicitly denotes the 2.70V threshold variant.
Does MAX6381XR27D3+ include a manual reset (MR) input?
No, MAX6381XR27D3+ does not feature a manual reset input. It is a basic single-supply supervisory device with only VCC, RESET, and GND pins. Manual reset capability is present only in MAX6384/MAX6385/MAX6386/MAX6390 variants, which use 4-pin SC70 or 6-pin µDFN packages and include dedicated MR pins.
What package type and dimensions does MAX6381XR27D3+ use?
MAX6381XR27D3+ is packaged in the 3-pin SC70-3 (package code X3-2), measuring 1.25mm × 0.85mm with 0.65mm lead pitch and maximum height of 0.8mm. This ultra-small outline is optimized for space-constrained portable electronics and conforms to JEDEC MO-203-AB standards.
Can MAX6381XR27D3+ monitor a second voltage rail?
No, MAX6381XR27D3+ monitors only the VCC supply rail. Auxiliary voltage monitoring via RESET IN is exclusive to MAX6387/MAX6388/MAX6389 variants, which use 4-pin SC70 or 6-pin µDFN packages and include a dedicated RESET IN pin referenced to an internal 1.27V comparator.
What is the minimum VCC voltage at which MAX6381XR27D3+ guarantees correct RESET output state?
MAX6381XR27D3+ guarantees valid RESET output logic state down to VCC = 1.0V. This means the open-drain output remains actively pulled low during undervoltage events and transitions predictably upon recovery - a critical feature for fail-safe operation in systems experiencing deep brownouts.
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:
- Power Supply Monitor
- 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:
- Automotive
- Qualification:
- AEC-Q100
- 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.
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