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Analog Devices Inc./Maxim Integrated MAX6381LT46D3+T
- Part No.:
- MAX6381LT46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT46D3+T.pdf
- Description:
- IC MPU/RESET CIRC 4.63V 6-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,893
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Product details
Overview
MAX6381LT46D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.63V reset threshold, 140ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors +1.8V to +5.0V supply rails, consumes 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 MAX6381LT46D3+T datasheet, MAX6381LT46D3+T pinout, MAX6381LT46D3+T application, or MAX6381LT46D3+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), open-drain output compatibility with mixed-voltage logic, and guaranteed operation at VCC ≥ 1V for deep brownout detection.
Technical Context
The MAX6381LT46D3+T implements a precision voltage comparator with internal 4.63V reference and hysteresis, triggering reset when VCC falls below the threshold. Its internal timer enforces a minimum 140ms reset assertion after VCC recovers, independent of supply ramp rate.
As a member of the MAX6381–MAX6390 family, it uses BiCMOS process technology for low quiescent current (3μA at 1.8V) and high noise immunity against negative-going VCC transients. It lacks manual reset (MR) and auxiliary RESET IN inputs-features reserved for other variants like MAX6384 or MAX6387.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (±2.5% over −40°C to +125°C); ensures reliable detection of 5V rail brownout before critical logic fails |
| VCC Reset Timeout | 140ms minimum; holds μP in reset long enough for power stabilization and clock lock in microcontroller boot sequences |
| Supply Current | 3μA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors without compromising supervision integrity |
| Output Type | Active-low open-drain; allows wired-OR configuration with other reset sources and level-shifting across voltage domains |
| Operating Voltage Range | +1.0V to +5.5V; supports valid reset assertion even during severe undervoltage conditions down to 1V |
| Reset Output Validity | Guaranteed correct logic state for VCC ≥ 1V; eliminates need for external pull-up biasing in ultra-low-VCC applications |
| Package | 6-pin μDFN (2mm × 2mm, 0.5mm pitch); enables high-density PCB layouts in space-constrained portable electronics |
Pinout & Package
MAX6381LT46D3+T is housed in a 6-pin μDFN package (Outline Number 21-0147, Land Pattern 90-0080), measuring 2mm × 2mm with 0.5mm lead pitch and exposed thermal pad. 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; must be connected to system ground plane for stable threshold accuracy |
| 2 | VCC | Main supply input and monitored voltage source; powers the device and feeds the primary reset comparator |
| 3 | N.C. | No internal connection; left unconnected on PCB; no electrical function or routing required |
| 4 | RESET | Active-low open-drain reset output; requires external pull-up resistor to host logic rail; asserts low during VCC fault or brownout |
| 5 | N.C. | No internal connection; left unconnected on PCB; no electrical function or routing required |
| 6 | N.C. | No internal connection; left unconnected on PCB; no electrical function or routing required |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V reset threshold | Eliminates external resistor divider; reduces BOM count and layout area while ensuring ±2.5% accuracy across automotive temperature range |
| 140ms minimum reset timeout | Meets JEDEC JESD78 reliability requirements for microcontroller initialization; prevents premature release before PLL lock or memory stabilization |
| Open-drain RESET output | Enables direct interface with 1.8V, 3.3V, or 5V logic families via single external pull-up; supports multi-source reset arbitration |
| 3μA supply current at 1.8V | Extends battery life in always-on monitoring nodes; allows integration into energy-harvesting subsystems without compromising supervision duty cycle |
| Valid operation down to VCC = 1V | Ensures deterministic reset behavior during deep brownout events; avoids undefined logic states that cause firmware corruption |
Applications
| Industrial PLC I/O Module | Battery-Powered Wireless Sensor Node |
|---|---|
Use Scenario: Monitors 5V backplane supply in modular industrial controllers where transient immunity and long-term stability are critical. IC Role / Device Role / Timing Role: Primary VCC supervisor providing power-on reset and brownout detection for ARM Cortex-M7 MCU and isolated CAN transceivers. Use Value: ±2.5% threshold accuracy over −40°C to +125°C ensures consistent trip point across operating environments; 140ms timeout exceeds typical FPGA configuration time. |
Use Scenario: Powers ultra-low-power environmental sensor (temperature/humidity/pressure) running on CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output feeding MSP430FR59xx MCU; triggers hard reset if battery voltage sags below 2.8V during RF transmission burst. Use Value: 3μA quiescent current minimizes standby drain; open-drain output interfaces directly with MCU's 1.8V IO domain using 10kΩ pull-up to 1.8V rail. |
| Medical Point-of-Care Diagnostic Device | Automotive Body Control Module (BCM) |
Use Scenario: Ensures safe boot sequence in handheld diagnostic instrument with dual-rail power (5V analog, 3.3V digital) and strict FDA-relevant reliability requirements. IC Role / Device Role / Timing Role: Single-point reset generator for main application processor and safety-monitoring microcontroller; provides synchronized reset pulse on both rails. Use Value: Guaranteed reset validity down to VCC = 1V prevents metastability during rapid battery depletion; AEC-Q100 qualified variants available for adjacent designs. |
Use Scenario: Monitors 5V supply in LIN-connected door module where ESD robustness and load-dump immunity are mandatory per ISO 7637-2. IC Role / Device Role / Timing Role: Secondary supervisor for infotainment interface IC; complements primary system PMIC by adding dedicated brownout detection on isolated 5V rail. Use Value: Negative-going transient immunity (validated per datasheet graphs) suppresses false resets during alternator load dump; 6-pin μDFN footprint matches legacy board space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326LTR46D3+T | Same 4.63V threshold, 140ms timeout, and 6-pin μDFN package; but push-pull active-low output instead of open-drain | Requires no external pull-up; incompatible with wired-OR reset buses or multi-voltage domain arbitration | Select when driving single-load 3.3V/5V logic without shared reset lines |
| TLV803EB46DBZR | 4.63V threshold, 140ms timeout, SOT-23-3 package; higher 8μA ICC at 1.8V; ±3% threshold accuracy over −40°C to +125°C | Lacks guaranteed reset validity below 1.5V; unsuitable for deep brownout detection in sub-1.8V systems | Select for cost-sensitive consumer applications where 3-pin footprint and lower unit price outweigh extended low-VCC operation |
Compared with MAX6381LT46D3+T, MAX6326LTR46D3+T offers simpler drive capability but sacrifices bus-sharing flexibility, while TLV803EB46DBZR trades off low-power performance and deep-VCC reliability for compact size and lower cost-making MAX6381LT46D3+T optimal for industrial and medical designs demanding both ultra-low ICC and robust sub-1.5V supervision.
Availability
MAX6381LT46D3+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered wireless sensor nodes, medical point-of-care devices, automotive body control modules, and dual-voltage embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6381LT46D3+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 markets, with emphasis on power efficiency, reliability, and integration.
The MAX6381–MAX6390 product line delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems operating across harsh temperature ranges and constrained power budgets.
FAQ
What is the exact reset threshold voltage of MAX6381LT46D3+T?
The MAX6381LT46D3+T has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "46"), and applies specifically to the MAX6381LT46D3+T variant-not derived from family averages or neighboring suffixes.
Does MAX6381LT46D3+T include a manual reset input (MR)?
No, MAX6381LT46D3+T does not feature a manual reset input. MR functionality is exclusive to MAX6384/MAX6385/MAX6386 and MAX6390 variants. The MAX6381LT46D3+T pinout contains three N.C. pins and only monitors VCC-no MR or RESET IN terminals are present or functional on this specific part number.
What is the meaning of the "D3" suffix in MAX6381LT46D3+T?
The "D3" suffix in MAX6381LT46D3+T specifies a minimum reset timeout period of 140ms following VCC recovery above the 4.63V threshold. This timing is fixed and factory-programmed; it is not adjustable externally. The D3 delay is validated across −40°C to +125°C and meets JEDEC JESD78 requirements for microprocessor reset hold time.
Can MAX6381LT46D3+T operate with VCC below 1.8V?
Yes, MAX6381LT46D3+T is fully specified to operate down to VCC = 1.0V, and its reset output remains guaranteed valid (logically correct) for VCC ≥ 1.0V. At 1.0V, supply current drops to ~3.5μA (typical), and the 4.63V threshold comparator remains functional-enabling detection of catastrophic brownout events before system collapse.
Is MAX6381LT46D3+T pin-compatible with MAX809 or MAX6326?
No, MAX6381LT46D3+T is not pin-compatible with MAX809 (3-pin SOT-23) or MAX6326 (6-pin μDFN with different pinout). While the datasheet notes "pin compatible with MAX809/MAX810/…/MAX6326/…" at the family level, this refers only to functional equivalence-not physical pin mapping. MAX6381LT46D3+T uses GND/VCC/N.C./RESET/N.C./N.C. ordering, whereas MAX6326 places RESET on pin 3 and GND on pin 1-requiring PCB redesign.
MAX6381LT46D3+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:
- 4.63V
- 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)
MAX6381LT46D3+T FAQ
1.How can I place an order for MAX6381LT46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT46D3+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 MAX6381LT46D3+T reliable?
The price and inventory of MAX6381LT46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381LT46D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT46D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT46D3+T?
MAX6381LT46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT46D3+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 MAX6381LT46D3+T?
For technical support, including MAX6381LT46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT46D3+T requirements.
6.How does Aetrix verify that MAX6381LT46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381LT46D3+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 MAX6381LT46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381LT46D3+T?
All MAX6381LT46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT46D3+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 MAX6381LT46D3+T part is unused and in its original packaging.
Return procedure for MAX6381LT46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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