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Analog Devices Inc./Maxim Integrated MAX6381LT35D1+T
- Part No.:
- MAX6381LT35D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT35D1+T.pdf
- Description:
- IC MPU/RESET CIRC 3.50V 6-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:27,500
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Product details
Overview
MAX6381LT35D1+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 3.50V reset threshold, 1ms minimum reset timeout, and active-low open-drain reset output. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. It is used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381LT35D1+T datasheet, MAX6381LT35D1+T pinout, MAX6381LT35D1+T application, or MAX6381LT35D1+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), open-drain output compatibility with I²C bus pull-up schemes, 6-pin μDFN package footprint, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.
Technical Context
The MAX6381LT35D1+T implements a precision voltage comparator with ±2.5% threshold accuracy over temperature, comparing VCC against an internal reference to trigger reset assertion when VCC falls below 3.50V. Its internal timer enforces a guaranteed minimum 1ms reset timeout after VCC recovers above threshold.
This device belongs to the MAX6381–MAX6390 family of single-supply supervisors with no auxiliary input or manual reset - it provides dedicated VCC monitoring only. Its open-drain RESET output requires an external pullup resistor and remains functional down to VCC = 1V, enabling robust reset signaling during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.50V (factory-set, ±2.5% tolerance over –40°C to +125°C) |
| Reset Timeout Period | 1ms minimum (guaranteed deassertion delay after VCC recovery) |
| Supply Current | 3μA at VCC = +1.8V (enables multi-year operation in coin-cell–powered devices) |
| Operating Voltage Range | +1.0V to +5.5V (ensures reset validity during ultra-low-voltage brownout) |
| Output Type | Active-low open-drain (requires external pullup; compatible with mixed-voltage logic buses) |
| Reset Output Validity | Guaranteed down to VCC = 1V (prevents spurious release during slow power ramp-down) |
| Package | 6-pin μDFN (2mm × 2mm, 0.5mm pitch; supports high-density PCB layouts) |
Pinout & Package
MAX6381LT35D1+T is housed in a 6-pin μDFN package (outline 21-0147, land pattern 90-0080) with wettable flanks for automated optical inspection. The package is RoHS-compliant (+ suffix) and rated for –40°C to +125°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator |
| 2 | VCC | Primary supply input and monitored voltage source (1.0V to 5.5V range) |
| 3 | N.C. | No internal connection; must be left floating or tied to GND/VCC per layout guidelines |
| 4 | RESET | Active-low open-drain reset output; requires external pullup resistor for logic-high state |
| 5 | N.C. | No internal connection; must be left floating or tied to GND/VCC per layout guidelines |
| 6 | N.C. | No internal connection; must be left floating or tied to GND/VCC per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.50V with ±2.5% accuracy across –40°C to +125°C eliminates external calibration |
| Ultra-low quiescent current | 3μA at 1.8V enables >10-year battery life in always-on IoT sensors |
| Open-drain RESET output | Supports wired-OR configuration and level-shifting without additional logic |
| Negative-going transient immunity | Withstands VCC glitches ≤35µs duration at 100mV overdrive without false reset |
| Valid reset down to 1V VCC | Ensures deterministic μP reset state even during severe undervoltage conditions |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output to assert reset if battery voltage drops below 3.50V during cold start or aging. Use Value: Prevents firmware execution errors during marginal power conditions; 1ms timeout ensures full μP initialization before peripheral enable. |
Use Scenario: DIN-rail mounted digital input module operating in harsh factory environments with noisy 24V DC supply. IC Role / Device Role / Timing Role: Supervises local 3.3V logic rail derived from industrial-grade DC/DC converter. Use Value: Open-drain output interfaces directly with optocoupler input; ±2.5% threshold stability maintains reliability across wide temperature swings. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: Low-power BCM sub-module monitoring 5V system rail in parking mode. IC Role / Device Role / Timing Role: Provides fail-safe reset during load-dump recovery or battery disconnect events. Use Value: Valid reset assertion down to VCC = 1V prevents latch-up during slow power collapse; AEC-Q100 qualified variants available. |
Use Scenario: Revenue-grade meter with dual-supply architecture (3.3V MCU + 5V metrology ADC). IC Role / Device Role / Timing Role: Ensures synchronized reset of both domains upon 3.3V rail instability. Use Value: 3μA supply current minimizes self-heating impact on metrology accuracy; 6-pin μDFN fits tight space constraints near RTC crystal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR35D1+T | 3-pin SC70 package; same 3.50V threshold and 1ms timeout; push-pull active-low output | Requires no external pullup; unsuitable for wired-OR or mixed-voltage bus sharing | Select when board space is constrained and open-drain functionality is unnecessary |
| TLV809E35DBZR | 3.5V threshold, 140ms timeout, SOT-23-3 package; ±1.5% accuracy at +25°C only (±3% over temp) | Lacks guaranteed operation below VCC = 1.8V; higher 4.5μA typical ICC at 1.8V | Select for cost-sensitive consumer applications where extended temperature performance is secondary |
Compared with MAX6381LT35D1+T, MAX6326XR35D1+T offers smaller footprint but forfeits open-drain flexibility, while TLV809E35DBZR trades threshold stability and ultra-low current for lower unit cost - making MAX6381LT35D1+T optimal for mission-critical industrial and automotive designs demanding guaranteed 1V operation and thermal accuracy.
Availability
MAX6381LT35D1+T 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 MAX6381LT35D1+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, communications, and computing applications.
The MAX6381–MAX6390 family delivers low-power, high-accuracy voltage supervision for microprocessor-based systems where reliability under brownout, transient, and extended temperature conditions is critical.
FAQ
What is the exact reset threshold voltage of MAX6381LT35D1+T?
The MAX6381LT35D1+T has a factory-set reset threshold of 3.50V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This value is fixed and cannot be adjusted externally. The "35" in the part number explicitly denotes the 3.50V threshold per Maxim's ordering guide, and the device does not incorporate user-programmable or resistor-adjustable thresholds.
Does MAX6381LT35D1+T support manual reset functionality?
No, MAX6381LT35D1+T does not include a manual reset (MR) input. It is a single-function VCC supervisor with no MR pin - unlike MAX6384/MAX6385/MAX6390 variants. The pinout confirms pins 3, 5, and 6 are N.C., and the datasheet explicitly assigns MR functionality only to specific members of the MAX6381–MAX6390 family, excluding MAX6381.
What package type and dimensions does MAX6381LT35D1+T use?
MAX6381LT35D1+T uses a 6-pin μDFN package (2.0mm × 2.0mm, 0.5mm pitch), outline number 21-0147, with wettable flanks. The package code is L611+1, and it is RoHS-compliant (indicated by the "+T" suffix). Thermal resistance is θJA = 477°C/W on a multilayer board, and the device is rated for –40°C to +125°C operation.
Can MAX6381LT35D1+T monitor a second voltage rail?
No, MAX6381LT35D1+T does not support auxiliary voltage monitoring. It lacks a RESET IN pin and is designed exclusively for single-rail VCC supervision. Dual-monitoring capability is reserved for MAX6387/MAX6388/MAX6389 variants, which feature a dedicated RESET IN input compared to an internal 1.27V reference - a function absent in MAX6381LT35D1+T.
What is the minimum VCC voltage at which MAX6381LT35D1+T guarantees correct reset output behavior?
MAX6381LT35D1+T guarantees valid reset output logic states down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain defined output behavior. This specification ensures deterministic reset assertion during slow power-down sequences and deep brownout events - a key differentiator from many competing supervisors that cease reliable operation above 1.5V.
MAX6381LT35D1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX6381LT35D1+T FAQ
1.How can I place an order for MAX6381LT35D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT35D1+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 MAX6381LT35D1+T reliable?
The price and inventory of MAX6381LT35D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT35D1+T is usually 5 days.
3.What payment methods are accepted for MAX6381LT35D1+T?
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4.How is shipping managed for MAX6381LT35D1+T?
MAX6381LT35D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT35D1+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 MAX6381LT35D1+T?
For technical support, including MAX6381LT35D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT35D1+T requirements.
6.How does Aetrix verify that MAX6381LT35D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6381LT35D1+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 MAX6381LT35D1+T meets industry standards.
7.What is the process for return or replacement of MAX6381LT35D1+T?
All MAX6381LT35D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT35D1+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 MAX6381LT35D1+T part is unused and in its original packaging.
Return procedure for MAX6381LT35D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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