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

Analog Devices Inc./Maxim Integrated MAX6381LT23D3+T

Name: MAX6381LT23D3+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX6381LT23D3+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX6381LT23D3+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 6-WFDFN

Datasheet:: MAX6381LT23D3+T.pdf

Description:: IC SUPERVISOR 1 CHANNEL 6UDFN

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Product details

Overview

MAX6381LT23D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.31V reset threshold, 140ms minimum V_CC reset timeout, and active-low open-drain reset output. It monitors single supply voltage (1.0V–5.5V), consumes only 3μA at 1.8V, guarantees valid reset state down to V_CC = 1V, and operates across –40°C to +125°C for industrial power sequencing in battery-powered instrumentation.

For engineers reviewing the MAX6381LT23D3+T datasheet, MAX6381LT23D3+T pinout, MAX6381LT23D3+T application, or MAX6381LT23D3+T equivalent, key selection criteria include its ±2.5% reset threshold accuracy over temperature, immunity to negative-going V_CC transients, compatibility with 1.8V/2.5V/3.3V/5V systems, and support for compact 6-pin μDFN layout without external pullup for push-pull variants (not applicable here-open-drain requires external pullup).

Technical Context

The MAX6381LT23D3+T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and internal timer logic that asserts reset when V_CC falls below 2.31V (±2.5% over –40°C to +125°C) and holds it for ≥140ms after V_CC recovers. Its open-drain RESET output requires an external pullup resistor and remains functional down to V_CC = 1V, enabling reliable brownout detection in ultra-low-voltage systems.

This variant belongs to the MAX6381 series (no MR input, no RESET IN), uses BiCMOS process, and lacks manual reset or auxiliary voltage monitoring-distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389. It is pin-compatible with legacy MAX809/MAX810 but differs in package footprint (6-pin μDFN vs. 3-pin SOT23) and thermal resistance (θ_JA = 477°C/W).

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold	2.31V (nominal), ±2.5% over –40°C to +125°C - ensures accurate brownout detection across industrial temperature range
V_CC Operating Range	1.0V to 5.5V - supports operation from sub-1.8V logic rails up to 5V legacy systems
Reset Timeout Period	140ms (minimum) - provides sufficient hold time for microprocessor initialization sequences
Supply Current	3μA at V_CC = 1.8V - enables multi-year battery life in portable equipment
Output Type	Active-low open-drain - requires external pullup; allows wired-OR configuration and level translation
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive and industrial control environments
Package	6-pin μDFN (1.5mm × 1.5mm, 0.5mm pitch) - enables high-density PCB layouts with low thermal resistance (θ_JC = 122°C/W)

Pinout & Package

MAX6381LT23D3+T is housed in a RoHS-compliant 6-pin μDFN package (outline 21-0147, land pattern 90-0080), measuring 1.5mm × 1.5mm with 0.5mm pitch and exposed thermal pad. The package supports reflow soldering per JEDEC J-STD-020 (peak 260°C) and has θ_JA = 477°C/W on multilayer board.

Pin	Circuit Role	Design Meaning
1	GND	Ground reference for all internal circuitry and reset comparator; must be low-impedance connection
2	V_CC	Primary supply input and monitored voltage rail; accepts 1.0V–5.5V with 3μA quiescent current
3	N.C.	No internal connection; left floating or tied to GND/V_CC per layout requirements - no electrical function
4	RESET	Active-low open-drain reset output; requires external pullup resistor (typically 10kΩ–100kΩ) to host V_CC
5	N.C.	No internal connection; electrically isolated - no routing or termination required
6	N.C.	No internal connection; unused pin - may be omitted from footprint if allowed by assembly process

Key Features

Feature	Design Value
Factory-trimmed reset threshold	2.31V with ±2.5% tolerance over full temperature range - eliminates need for external resistor divider calibration
Ultra-low supply current	3μA at 1.8V - extends battery life in always-on sensor nodes and portable medical devices
Negative-going transient immunity	Rejects V_CC glitches ≤150µs at 100mV overdrive - prevents spurious resets in noisy power environments
Valid reset output down to V_CC = 1V	Guaranteed logic state integrity during deep brownout - ensures safe processor shutdown before data corruption
Small-footprint μDFN package	1.5mm × 1.5mm, 0.5mm pitch - saves >60% board area versus 3-pin SC70 while improving thermal performance

Applications

Industrial Power Sequencing	Battery-Powered Instrumentation
Use Scenario: Monitoring 3.3V main supply in programmable logic controller (PLC) I/O module during cold start and brownout events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU until stable 3.3V rail is confirmed for 140ms. Use Value: Prevents firmware execution errors during undervoltage conditions; open-drain output interfaces directly with 3.3V logic without level shifters.	Use Scenario: Power supervision in handheld gas detector using single-cell Li-ion (2.7V–4.2V) with low-quiescent-current requirement. IC Role / Device Role / Timing Role: Reset generator ensuring microcontroller remains held in reset until battery voltage exceeds 2.31V and stabilizes for ≥140ms post-power-on. Use Value: 3μA supply current extends operational runtime between charges; ±2.5% threshold accuracy maintains consistent trip point across temperature swings.
Dual-Rail Embedded Systems	Automotive Body Control Modules
Use Scenario: Coordinating startup of 1.8V core and 3.3V I/O supplies in FPGA-based edge AI accelerator card. IC Role / Device Role / Timing Role: Single-supply monitor for primary 3.3V rail; used alongside dedicated 1.8V supervisor (e.g., MAX6383LT18D3+T) for independent reset timing. Use Value: Enables discrete, optimized reset timing per rail; 6-pin μDFN footprint simplifies placement near power entry points.	Use Scenario: Reset management in 12V-to-3.3V converted subsystem of automotive seat control ECU operating at –40°C to +125°C. IC Role / Device Role / Timing Role: Voltage supervisor validating post-regulator 3.3V rail integrity before enabling CAN transceiver and motor drivers. Use Value: AEC-Q100 qualification (via /V suffix variants) and 125°C rating ensure reliability in under-dash environments; open-drain output tolerates bus contention.

Industrial Power Sequencing

Battery-Powered Instrumentation

Use Scenario: Monitoring 3.3V main supply in programmable logic controller (PLC) I/O module during cold start and brownout events.

IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU until stable 3.3V rail is confirmed for 140ms.

Use Value: Prevents firmware execution errors during undervoltage conditions; open-drain output interfaces directly with 3.3V logic without level shifters.

Use Scenario: Power supervision in handheld gas detector using single-cell Li-ion (2.7V–4.2V) with low-quiescent-current requirement.

IC Role / Device Role / Timing Role: Reset generator ensuring microcontroller remains held in reset until battery voltage exceeds 2.31V and stabilizes for ≥140ms post-power-on.

Use Value: 3μA supply current extends operational runtime between charges; ±2.5% threshold accuracy maintains consistent trip point across temperature swings.

Dual-Rail Embedded Systems

Automotive Body Control Modules

Use Scenario: Coordinating startup of 1.8V core and 3.3V I/O supplies in FPGA-based edge AI accelerator card.

IC Role / Device Role / Timing Role: Single-supply monitor for primary 3.3V rail; used alongside dedicated 1.8V supervisor (e.g., MAX6383LT18D3+T) for independent reset timing.

Use Value: Enables discrete, optimized reset timing per rail; 6-pin μDFN footprint simplifies placement near power entry points.

Use Scenario: Reset management in 12V-to-3.3V converted subsystem of automotive seat control ECU operating at –40°C to +125°C.

IC Role / Device Role / Timing Role: Voltage supervisor validating post-regulator 3.3V rail integrity before enabling CAN transceiver and motor drivers.

Use Value: AEC-Q100 qualification (via /V suffix variants) and 125°C rating ensure reliability in under-dash environments; open-drain output tolerates bus contention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6381XR23D3+T	Same reset threshold (2.31V) and timeout (140ms), but in 3-pin SC70 package (1.25mm × 0.8mm)	Lacks N.C. pins; smaller footprint but higher θ_JA (340°C/W) and no exposed thermal pad	Select for space-constrained designs where thermal load is minimal and SC70 assembly is preferred.
MAX809TRD3+T	2.32V reset threshold, 140ms timeout, SOT23-3 package; higher ICC (12μA at 1.8V) and wider threshold tolerance (±3.5%)	Not qualified to –40°C to +125°C (only –40°C to +85°C); no AEC-Q100 option available	Choose for cost-sensitive commercial-grade applications where extended temperature range is not required.

Compared with MAX6381XR23D3+T, the MAX6381LT23D3+T offers superior thermal performance and layout flexibility via its 6-pin μDFN; versus MAX809TRD3+T, it delivers tighter threshold accuracy, lower power, and full industrial temperature support-critical for mission-critical embedded systems.

Availability

MAX6381LT23D3+T is available at Aetrix Electronics and suitable for industrial power sequencing, battery-powered instrumentation, dual-rail embedded systems, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6381LT23D3+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 industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor reset circuits optimized for ultra-low quiescent current, wide temperature operation, and compact packaging in demanding embedded environments.

FAQ

What is the exact reset threshold voltage of MAX6381LT23D3+T and how does it vary with temperature?

The MAX6381LT23D3+T has a nominal reset threshold of 2.31V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. At +25°C, the threshold is specified as 2.31V ±1.5%, and the tempco is 60ppm/°C. This means the actual trip point stays within 2.25V–2.37V across industrial temperatures, ensuring robust brownout detection without calibration.

Does MAX6381LT23D3+T include a manual reset input (MR) or auxiliary voltage monitor (RESET IN)?

No, MAX6381LT23D3+T does not include a manual reset input or auxiliary RESET IN pin. It belongs to the base MAX6381 series, which provides only V_CC-monitored reset functionality. Devices with MR capability include MAX6384/MAX6385/MAX6386/MAX6390, while RESET IN is available on MAX6387/MAX6388/MAX6389 - neither feature is present in MAX6381LT23D3+T.

What external components are required for proper operation of MAX6381LT23D3+T?

MAX6381LT23D3+T requires an external pullup resistor on the open-drain RESET pin - typically 10kΩ to 100kΩ connected to the host system's logic rail (e.g., 3.3V). No other passive components are mandatory. A 0.1μF ceramic capacitor placed close to the V_CC pin improves noise immunity against fast transients, though not strictly required for basic functionality.

Can MAX6381LT23D3+T operate reliably at V_CC = 1.2V, and what is its behavior below 1.8V?

Yes, MAX6381LT23D3+T is fully specified to operate down to V_CC = 1.0V, with guaranteed reset output validity at 1.0V. At 1.2V, it draws ~4μA (per typical ICC curve), maintains ±2.5% threshold accuracy, and asserts reset correctly when V_CC drops below 2.31V. Below 1.8V, supply current decreases linearly to 3μA at 1.8V and further to ~2.5μA at 1.2V - enabling use in emerging sub-1.8V logic domains.

Is MAX6381LT23D3+T pin-compatible with older MAX809 or MAX810 devices?

MAX6381LT23D3+T is functionally compatible but not pin-compatible with MAX809/MAX810 due to differing packages: MAX809 uses 3-pin SOT23, while MAX6381LT23D3+T uses 6-pin μDFN. However, it is pin-compatible with other MAX6381 variants in the same μDFN package (e.g., MAX6381LT18D3+T), and shares identical reset timing and threshold logic - requiring only PCB footprint revision for migration.

MAX6381LT23D3+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 6-WFDFN

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 2.31V

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:: 6-µDFN (1.5x1)

MAX6381LT23D3+T FAQ

1.How can I place an order for MAX6381LT23D3+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX6381LT23D3+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 MAX6381LT23D3+T reliable?

The price and inventory of MAX6381LT23D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT23D3+T is usually 5 days.

3.What payment methods are accepted for MAX6381LT23D3+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT23D3+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX6381LT23D3+T?

MAX6381LT23D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX6381LT23D3+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 MAX6381LT23D3+T?

For technical support, including MAX6381LT23D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT23D3+T requirements.

6.How does Aetrix verify that MAX6381LT23D3+T is sourced from the original manufacturer or authorized distributors?

All MAX6381LT23D3+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 MAX6381LT23D3+T meets industry standards.

7.What is the process for return or replacement of MAX6381LT23D3+T?

All MAX6381LT23D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT23D3+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 MAX6381LT23D3+T part is unused and in its original packaging.

Return procedure for MAX6381LT23D3+T:

1.Submit a request within 90 days.

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

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