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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX6381XR26D4+T

Name: MAX6381XR26D4+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6381XR26D4+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6381XR26D4+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: SC-70, SOT-323

Datasheet:: MAX6381XR26D4+T.pdf

Description:: IC SUPERVISOR 1 CHANNEL SC70-3

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Product details

Overview

MAX6381XR26D4+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.63V reset threshold, 1120ms minimum V_CC reset timeout, and active-low open-drain reset output in a 3-pin SC70 package. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, guarantees valid reset state down to V_CC = 1V, and is used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6381XR26D4+T datasheet, MAX6381XR26D4+T pinout, MAX6381XR26D4+T application, or MAX6381XR26D4+T equivalent, key selection criteria include its precise 2.63V reset threshold (±2.5% over –40°C to +125°C), 1120ms V_CC timeout, open-drain output requiring external pullup, and compatibility with dual-voltage monitoring systems via auxiliary reset input variants.

Technical Context

The MAX6381XR26D4+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 1120ms reset assertion after V_CC rises above 2.63V, independent of supply ramp rate.

As a member of the MAX6381–MAX6390 family, it shares core architecture with variants offering push-pull outputs, manual reset inputs, or auxiliary RESET IN comparators-but MAX6381XR26D4+T itself provides only V_CC-monitored reset with no MR or RESET IN pins, confirmed by its 3-pin SC70 pinout and ordering suffix "XR" (3-pin) + "26" (2.63V) + "D4" (1120ms).

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 rail brownout with margin
V_CC Reset Timeout	1120ms (minimum) - holds μP in reset long enough for stable clock and memory initialization
Supply Current	3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors
Operating Voltage Range	+1.0V to +5.5V - supports valid reset assertion even during deep brownout down to 1V
Output Type	Active-low open-drain - requires external pullup; enables wired-OR reset bus sharing across multiple ICs
Package	3-pin SC70 (2.0mm × 2.1mm) - ultra-compact footprint for space-constrained portable designs
Temperature Range	–40°C to +125°C - qualified for automotive under-hood and industrial control environments

Pinout & Package

MAX6381XR26D4+T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with 0.65mm pitch and RoHS-compliant lead-free finish (+T suffix). Pin 1 is RESET (active-low open-drain), Pin 2 is V_CC, and Pin 3 is GND - no NC or MR pins present.

Pin	Circuit Role	Design Meaning
1	RESET	Open-drain active-low reset output; must be pulled up externally to V_CC or another logic rail
2	V_CC	Main supply input and monitored voltage source; powers internal circuitry and sets reset threshold reference
3	GND	Analog and digital ground reference; must be connected directly to system ground plane

Key Features

Feature	Design Value
Factory-trimmed reset threshold	2.63V with ±2.5% tolerance over full temperature range - eliminates external resistor divider calibration
Ultra-low quiescent current	3μA at 1.8V - extends battery life in always-on monitoring applications
Guaranteed reset validity	Valid logic state maintained down to V_CC = 1V - prevents spurious release during slow power-down
Negative-going transient immunity	Rejects V_CC glitches <100µs wide below threshold - avoids false resets in noisy power environments
Small-footprint packaging	3-pin SC70 (2.0mm × 2.1mm) - saves >50% board area vs. SOT-23 alternatives

Applications

Power-On Reset for Microcontrollers	Battery-Powered Sensor Nodes
Use Scenario: Ensuring deterministic startup of an ARM Cortex-M0+ MCU after cold power application or wake-from-hibernate. IC Role / Device Role / Timing Role: Monitors 3.3V V_CC rail and asserts open-drain RESET until voltage stabilizes above 2.63V for ≥1120ms. Use Value: Prevents code execution before flash controller and PLL achieve lock, eliminating boot failures in field-deployed edge devices.	Use Scenario: Maintaining system integrity in a LoRaWAN soil moisture sensor powered by a CR2032 coin cell. IC Role / Device Role / Timing Role: Detects 2.5V rail collapse during battery depletion and forces MCU reset before ADC or radio misreads. Use Value: Enables graceful shutdown and data logging retention by asserting reset at precisely 2.63V with sub-μA current draw.
Dual-Voltage System Monitoring	Industrial PLC I/O Module
Use Scenario: Coordinating power sequencing between 1.8V core and 3.3V I/O rails in an FPGA-based interface card. IC Role / Device Role / Timing Role: Provides primary reset for 3.3V domain; paired with MAX6387 variant for 1.8V domain monitoring. Use Value: Achieves synchronized reset timing across domains without custom timing circuits or firmware intervention.	Use Scenario: Protecting programmable logic controllers from undervoltage-induced latch-up during factory mains fluctuations. IC Role / Device Role / Timing Role: Supervises 5.0V auxiliary supply feeding isolated CAN transceivers and analog front-ends. Use Value: Guarantees 1120ms reset hold time to prevent partial configuration writes during brownout recovery.

Power-On Reset for Microcontrollers

Battery-Powered Sensor Nodes

Use Scenario: Ensuring deterministic startup of an ARM Cortex-M0+ MCU after cold power application or wake-from-hibernate.

IC Role / Device Role / Timing Role: Monitors 3.3V V_CC rail and asserts open-drain RESET until voltage stabilizes above 2.63V for ≥1120ms.

Use Value: Prevents code execution before flash controller and PLL achieve lock, eliminating boot failures in field-deployed edge devices.

Use Scenario: Maintaining system integrity in a LoRaWAN soil moisture sensor powered by a CR2032 coin cell.

IC Role / Device Role / Timing Role: Detects 2.5V rail collapse during battery depletion and forces MCU reset before ADC or radio misreads.

Use Value: Enables graceful shutdown and data logging retention by asserting reset at precisely 2.63V with sub-μA current draw.

Dual-Voltage System Monitoring

Industrial PLC I/O Module

Use Scenario: Coordinating power sequencing between 1.8V core and 3.3V I/O rails in an FPGA-based interface card.

IC Role / Device Role / Timing Role: Provides primary reset for 3.3V domain; paired with MAX6387 variant for 1.8V domain monitoring.

Use Value: Achieves synchronized reset timing across domains without custom timing circuits or firmware intervention.

Use Scenario: Protecting programmable logic controllers from undervoltage-induced latch-up during factory mains fluctuations.

IC Role / Device Role / Timing Role: Supervises 5.0V auxiliary supply feeding isolated CAN transceivers and analog front-ends.

Use Value: Guarantees 1120ms reset hold time to prevent partial configuration writes during brownout recovery.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6326XR26D4+T	Same 2.63V threshold, 1120ms timeout, 3-pin SC70, but push-pull active-low output	No external pullup required; incompatible with wired-OR reset buses	Select when board layout lacks space for pullup resistor or when driving high-capacitance reset lines directly
TLV803EB26DBZR	2.63V threshold, 140ms timeout, SOT-23-3, open-drain active-low, 0.5μA typical I_CC	Shorter timeout; lower current; different pinout (RESET/V_CC/GND vs. RESET/GND/V_CC)	Select for ultra-low-power applications where 140ms reset hold suffices and pinout adaptation is feasible

Compared with MAX6381XR26D4+T, MAX6326XR26D4+T simplifies BOM by eliminating the pullup resistor but sacrifices bus-sharing capability, while TLV803EB26DBZR reduces supply current by 83% at the cost of 88% shorter reset duration and non-pin-compatible layout.

Availability

MAX6381XR26D4+T is available at Aetrix Electronics and suitable for battery-powered equipment, industrial PLC modules, and microcontroller-based edge sensors requiring stable component supply with automotive-grade temperature support.

Supply support for MAX6381XR26D4+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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6381–MAX6390 family delivers single- and dual-supply microprocessor supervisory circuits optimized for low-voltage, low-power embedded systems where reliability, small size, and wide temperature operation are critical.

FAQ

What is the exact reset threshold voltage of MAX6381XR26D4+T and how tightly is it specified?

The MAX6381XR26D4+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 for 2.5V and 2.8V supply rails without external calibration.

Does MAX6381XR26D4+T include a manual reset input (MR) pin?

No, MAX6381XR26D4+T does not include a manual reset input. It is a basic V_CC-only supervisory device in the 3-pin SC70 package. Manual reset functionality is available only on variants such as MAX6384–MAX6386 and MAX6390, which use 4-pin SC70 or 6-pin μDFN packages and explicitly list MR in their pin descriptions.

What is the minimum V_CC level at which MAX6381XR26D4+T guarantees correct reset output logic state?

MAX6381XR26D4+T guarantees valid reset output logic state down to V_CC = 1.0V. Below this voltage, the internal circuitry may not maintain defined output behavior. This feature ensures reliable reset assertion during slow power-down sequences common in battery-backed systems.

Can MAX6381XR26D4+T monitor a second voltage rail like some other family members?

No, MAX6381XR26D4+T does not support auxiliary voltage monitoring. The RESET IN function is exclusive to MAX6387/MAX6388/MAX6389 variants, which require at least a 4-pin SC70 or 6-pin μDFN package to accommodate the additional input pin. MAX6381XR26D4+T monitors only the V_CC supply.

What package type and dimensions does MAX6381XR26D4+T use, and is it RoHS-compliant?

MAX6381XR26D4+T uses a 3-pin SC70 package (outline number 21-0075) measuring 2.0mm × 2.1mm with 0.65mm pin pitch. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant, with JEDEC-standard thermal characteristics (θ_JA = 340.4°C/W on multilayer board).

MAX6381XR26D4+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:: 2.63V

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: 1.12s Minimum

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-3

MAX6381XR26D4+T FAQ

1.How can I place an order for MAX6381XR26D4+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6381XR26D4+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 MAX6381XR26D4+T reliable?

The price and inventory of MAX6381XR26D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D4+T is usually 5 days.

3.What payment methods are accepted for MAX6381XR26D4+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR26D4+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6381XR26D4+T?

MAX6381XR26D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6381XR26D4+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 MAX6381XR26D4+T?

For technical support, including MAX6381XR26D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D4+T requirements.

6.How does Aetrix verify that MAX6381XR26D4+T is sourced from the original manufacturer or authorized distributors?

All MAX6381XR26D4+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 MAX6381XR26D4+T meets industry standards.

7.What is the process for return or replacement of MAX6381XR26D4+T?

All MAX6381XR26D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D4+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 MAX6381XR26D4+T part is unused and in its original packaging.

Return procedure for MAX6381XR26D4+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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