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Analog Devices Inc./Maxim Integrated MAX6381LT22D3+T
- Part No.:
- MAX6381LT22D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT22D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,192
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Product details
Overview
MAX6381LT22D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.19V reset threshold, 140ms minimum VCC reset timeout, and open-drain active-low RESET output. It monitors single supply voltage (1.0V–5.5V), consumes only 3μA at 1.8V, guarantees valid reset state down to VCC = 1V, and is used in battery-powered embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6381LT22D3+T datasheet, MAX6381LT22D3+T pinout, MAX6381LT22D3+T application, or MAX6381LT22D3+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), open-drain output compatibility with mixed-voltage systems, 6-pin μDFN package footprint, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.
Technical Context
The MAX6381LT22D3+T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC recovers above 2.19V, independent of supply ramp rate.
This device belongs to the MAX6381–MAX6390 family of single-supply supervisors with no manual reset (MR) or auxiliary RESET IN inputs - confirmed by its part number suffix "LT" (indicating 6-pin μDFN, no MR, no RESET IN) and pin configuration table showing only RESET, VCC, and GND connections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V (factory-set, ±2.5% over –40°C to +125°C) - ensures deterministic reset activation during 2.2V system brownouts |
| Reset Timeout | 140ms minimum - holds μP in reset long enough for power stabilization and oscillator startup in low-voltage microcontrollers |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Output Type | Open-drain active-low RESET - supports wired-OR logic, level translation, and pullup to higher voltage rail (e.g., 3.3V RESET line on 1.8V core) |
| Operating Voltage | 1.0V to 5.5V - functions as reset source even during deep brownout when VCC drops below 1.8V |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
| Package | 6-pin μDFN (2mm × 2mm, 0.5mm pitch) - compact footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6381LT22D3+T uses a 6-pin μDFN package (Outline Number 21-0147, Land Pattern 90-0080) with wettable flanks, RoHS-compliant, and rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparators and timer; must be connected to system ground plane for noise immunity |
| 2 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and serves as reset threshold reference point |
| 3 | N.C. | No internal connection; left floating or tied to GND per layout best practice - no electrical function |
| 4 | RESET | Open-drain active-low reset output; requires external pullup resistor (typically 10kΩ to 3.3V/5V); asserts low during VCC undervoltage |
| 5 | N.C. | No internal connection; electrically isolated - no routing or termination required |
| 6 | N.C. | No internal connection; unused pad - may be connected to thermal pad or left unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.19V with ±2.5% tolerance over full temperature range - eliminates need for external resistor divider calibration |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in portable medical devices and wireless sensor nodes |
| Valid reset output down to VCC = 1V | Ensures controlled shutdown sequence even during severe brownout - prevents undefined μP state |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs duration at 100mV overdrive - suppresses false resets from switching noise |
| Open-drain RESET architecture | Enables shared reset bus across multiple voltage domains (e.g., 1.8V core + 3.3V I/O) without level shifters |
Applications
| Battery-Powered IoT Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Coin-cell–powered environmental sensor transmitting data via BLE every 5 minutes. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output; asserts open-drain RESET to nRF52832 until stable power is confirmed post-wakeup. Use Value: 3μA supply current extends 200mAh CR2032 battery life beyond 10 years; 140ms timeout ensures RF oscillator stability before transmission. |
Use Scenario: Door module controlling window lift, mirror fold, and interior lighting using SBC-supplied 5V rail. IC Role / Device Role / Timing Role: Supervises 5V supply derived from automotive SBC; triggers MCU reset if battery dips below 2.19V during cold-crank. Use Value: AEC-Q100–qualified operation and –40°C to +125°C range ensure reliability in under-dash mounting; ±2.5% threshold accuracy prevents premature reset during load dump. |
| Industrial PLC I/O Expansion Card | Medical Infusion Pump Controller |
Use Scenario: DIN-rail mounted I/O card with isolated 3.3V and 24V rails powering ARM Cortex-M4 and field-side drivers. IC Role / Device Role / Timing Role: Resets microcontroller when 3.3V logic rail falls below 2.19V due to isolation barrier fault or LDO failure. Use Value: Open-drain output allows direct connection to 3.3V reset bus shared with other modules; 6-pin μDFN saves space on dense carrier board. |
Use Scenario: Safety-critical infusion pump with dual-redundant ARM cores requiring deterministic reset during power interruption. IC Role / Device Role / Timing Role: Provides fail-safe reset signal to both MCUs when main 2.5V supply sags below 2.19V during AC dropout. Use Value: Guaranteed reset assertion down to VCC = 1V prevents partial execution of motor control code; 140ms timeout exceeds pump motor driver startup delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR22D3+T | Same 2.19V threshold and 140ms timeout, but 3-pin SC70 package (no N.C. pins); push-pull active-low output | Requires different PCB footprint and lacks open-drain flexibility; not suitable for wired-OR reset buses | Select when board space is extremely constrained and level translation is unnecessary |
| TPS3808G125DBVR | 2.175V threshold (±0.5% typical), 200ms timeout, push-pull active-low, 6-pin SOT-23 package | Higher accuracy but fixed push-pull output; no open-drain option; lower quiescent current (1.5μA) | Choose for precision timing-critical applications where open-drain is not required and SOT-23 is preferred |
Compared with MAX6326XR22D3+T and TPS3808G125DBVR, the MAX6381LT22D3+T uniquely combines open-drain output, ultra-low 3μA supply current at 1.8V, and AEC-Q100 qualification in a 2mm × 2mm μDFN - making it optimal for space-constrained, multi-rail, and automotive-grade designs requiring reset bus sharing.
Availability
MAX6381LT22D3+T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, automotive body control modules, industrial PLC I/O cards, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381LT22D3+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 demanding industrial, automotive, and medical applications, with expertise in low-power supervision and robust interface solutions.
The MAX6381–MAX6390 product line delivers single/dual low-voltage microprocessor reset circuits optimized for ultra-low power consumption, wide temperature operation, and flexible reset output configurations in miniature packages.
FAQ
What is the exact reset threshold voltage of MAX6381LT22D3+T?
The MAX6381LT22D3+T has a factory-set reset threshold of 2.19V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed by the "22" suffix in the part number, referencing the Reset Threshold table where "22" corresponds to nominal 2.19V (min 2.13V, max 2.24V at +25°C).
Does MAX6381LT22D3+T include a manual reset input (MR)?
No, MAX6381LT22D3+T does not feature a manual reset input. The "LT" prefix in the part number denotes the 6-pin μDFN variant without MR or RESET IN functionality. Pin configuration diagrams confirm only three functional pins: RESET, VCC, and GND - with pins 3, 5, and 6 designated as N.C. (no connection).
What is the minimum reset timeout period for MAX6381LT22D3+T?
The MAX6381LT22D3+T provides a guaranteed minimum reset timeout period of 140ms after VCC rises above the 2.19V threshold. This is specified by the "D3" suffix and verified in the Electrical Characteristics table under "Reset Timeout Period" for MAX6381–MAX6389, where D3 maps to 140ms (min) / 280ms (max).
Can MAX6381LT22D3+T operate with supply voltages below 1.8V?
Yes, MAX6381LT22D3+T operates from 1.0V to 5.5V and guarantees valid reset output behavior down to VCC = 1V. At 1.0V, the open-drain RESET output maintains correct logic state, enabling controlled shutdown in deep brownout conditions - a key specification confirmed in the Absolute Maximum Ratings and Detailed Description sections.
Is MAX6381LT22D3+T qualified for automotive applications?
MAX6381LT22D3+T is rated for –40°C to +125°C operation and is AEC-Q100 qualified, as explicitly stated in the Features section. While the specific ordering suffix "/V" indicates an automotive-qualified version, the base part MAX6381LT22D3+T meets AEC-Q100 requirements and is widely used in automotive body electronics per Maxim's Selector Guide and application notes.
MAX6381LT22D3+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:
- 2.19V
- 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)
MAX6381LT22D3+T FAQ
1.How can I place an order for MAX6381LT22D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT22D3+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 MAX6381LT22D3+T reliable?
The price and inventory of MAX6381LT22D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT22D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381LT22D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT22D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT22D3+T?
MAX6381LT22D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT22D3+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 MAX6381LT22D3+T?
For technical support, including MAX6381LT22D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT22D3+T requirements.
6.How does Aetrix verify that MAX6381LT22D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381LT22D3+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 MAX6381LT22D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381LT22D3+T?
All MAX6381LT22D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT22D3+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 MAX6381LT22D3+T part is unused and in its original packaging.
Return procedure for MAX6381LT22D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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