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Analog Devices Inc./Maxim Integrated MAX6381LT29D3+T
- Part No.:
- MAX6381LT29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT29D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.93V 6-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,681
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Product details
Overview
MAX6381LT29D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.93V reset threshold, 140ms minimum VCC reset timeout, active-low open-drain reset output, and operation from 1.0V to 5.5V supply. It monitors single-supply systems in battery-powered instrumentation and embedded controllers, asserting reset during brownout or power-down events while consuming only 3μA at 1.8V.
For engineers reviewing the MAX6381LT29D3+T datasheet, MAX6381LT29D3+T pinout, MAX6381LT29D3+T application, or MAX6381LT29D3+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over –40°C to +125°C, negative-going transient immunity, and compatibility with dual-voltage monitoring architectures requiring auxiliary reset inputs.
Technical Context
The MAX6381LT29D3+T implements a precision bandgap-based voltage comparator with internal 2.93V reference and a monostable timeout circuit triggered on VCC fall below threshold. Its open-drain RESET output requires an external pullup and remains asserted for ≥140ms after VCC recovers above 2.93V.
No manual reset (MR) or auxiliary RESET IN inputs are present - this variant belongs to the base MAX6381 series (not MAX6384–MAX6390 or MAX6387–MAX6389), confirming single-supply monitoring only, fixed threshold, and no user-adjustable features beyond the factory-trimmed parameters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (±2.5% over –40°C to +125°C); ensures reliable detection of 3.3V rail brownout before μP malfunction. |
| VCC Range | 1.0V to 5.5V; enables operation during deep brownout and supports 1.8V/2.5V/3.3V/5.0V logic domains. |
| Reset Timeout | 140ms minimum; guarantees μP reset hold time sufficient for full power stabilization in portable systems. |
| Supply Current | 3μA at 1.8V; extends battery life in always-on monitoring applications such as IoT sensors. |
| Output Type | Active-low open-drain; allows wired-OR configuration with other reset sources and level translation via external pullup. |
| Operating Temp | –40°C to +125°C; qualified for industrial and automotive under-hood environments without derating. |
| Reset Validity | Guaranteed correct logic state down to VCC = 1V; prevents spurious release during final stage of power collapse. |
Pinout & Package
Supplied in a 6-pin μDFN package (1.5mm × 1.0mm, 0.5mm pitch) with wettable flanks, optimized for space-constrained PCB layouts and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and timer; must be low-impedance connection to system ground plane. |
| 2 | VCC | Primary supply input and monitored voltage source; powers internal circuitry and feeds reset comparator. |
| 3 | RESET | Active-low open-drain output; requires external pullup resistor (typically 10kΩ–100kΩ) to host VCC or I/O rail. |
| 4 | N.C. | No internal connection; left unconnected per design - not usable as spare I/O or thermal pad. |
| 5 | N.C. | No internal connection; electrically isolated - no routing or stitching required. |
| 6 | N.C. | No internal connection; mechanical pad only - no electrical function or thermal benefit claimed. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.93V threshold | Eliminates external resistor divider; reduces BOM count and layout area in 3.3V systems. |
| 140ms minimum reset timeout | Meets JEDEC JESD8-12E hold-time requirements for ARM Cortex-M and RISC-V microcontrollers. |
| 3μA supply current at 1.8V | Enables multi-year operation from coin-cell batteries in remote sensor nodes without duty cycling. |
| Open-drain RESET output | Supports mixed-voltage reset buses and avoids contention when multiple supervisors share one reset line. |
| –40°C to +125°C operation | Validated for extended temperature range without performance degradation or calibration drift. |
Applications
| Industrial Controller Monitoring | Portable Medical Instrumentation |
|---|---|
Use Scenario: Continuous monitoring of 3.3V main supply in PLC I/O modules exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Single-supply voltage supervisor asserting active-low reset to ARM-based controller during undervoltage events. Use Value: Prevents firmware corruption by holding reset until VCC stabilizes ≥140ms post-recovery, meeting IEC 61000-4-29 immunity requirements. | Use Scenario: Power sequencing and brownout protection in handheld glucose meters powered by single Li-ion cell. IC Role / Device Role / Timing Role: Low-quiescent supervisor detecting 2.93V threshold drop during battery discharge to initiate controlled shutdown. Use Value: 3μA supply current extends usable battery life by >18 months versus higher-current alternatives; open-drain output interfaces directly to 1.8V MCU reset pin. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Reset generation for microcontroller in 12V-to-3.3V converted subsystems within automotive door modules. IC Role / Device Role / Timing Role: AEC-Q100-compliant supervisor ensuring valid reset assertion across –40°C to +125°C junction temperature range. Use Value: ±2.5% threshold accuracy eliminates need for field calibration; guaranteed operation down to VCC = 1V prevents premature reset release during cold-crank transients. | Use Scenario: Supervision of isolated 3.3V rail powering metrology ADC and secure element in utility-grade electricity meters. IC Role / Device Role / Timing Role: Fault-tolerant reset generator with immunity to 100ns VCC glitches, preventing false resets from switching noise. Use Value: Negative-going transient immunity (per Figure 7) rejects >500ns spikes up to 200mV below threshold - critical for EMI-heavy metering environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | Same 2.93V threshold and 140ms timeout, but push-pull active-low output; no open-drain capability. | Requires dedicated reset net; cannot share bus with other open-drain supervisors or level-shifted peripherals. | Select when board layout lacks space for external pullup or when driving legacy 5V TTL reset inputs. |
| TPS3808G33DBVR | 2.93V threshold, 200ms timeout (not 140ms); 1.8V–6.5V VCC range; push-pull active-low output. | Higher quiescent current (1.1μA typical at 3.3V vs. 3μA at 1.8V); no guaranteed operation below 1.8V. | Select when longer timeout is acceptable and system uses TI-ecosystem MCUs with tighter reset timing margins. |
Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6381LT29D3+T uniquely combines open-drain output, sub-1V operational guarantee, and ultra-low 1.8V supply current - making it optimal for shared-reset buses and battery-critical designs where voltage headroom is minimal.
Availability
MAX6381LT29D3+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body electronics, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381LT29D3+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6381–MAX6390 family delivers ultra-low-power, precision voltage supervision in miniature SC70 and μDFN packages - engineered specifically for space- and power-constrained embedded systems requiring robust reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage of the MAX6381LT29D3+T?
The MAX6381LT29D3+T has a factory-trimmed nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table (suffix "29") and Electrical Characteristics section of the official datasheet, where VTH is specified as 2.85V (min), 2.93V (nom), and 3.00V (max) at +25°C, and maintains ±2.5% accuracy across temperature.
Does the MAX6381LT29D3+T support manual reset functionality?
No, the MAX6381LT29D3+T does not include a manual reset (MR) input. It belongs to the base MAX6381 series, which lacks MR and auxiliary RESET IN pins. Only MAX6384–MAX6390 (MR-enabled) and MAX6387–MAX6389 (RESET IN-enabled) variants provide those features. The MAX6381LT29D3+T is strictly a single-supply, fixed-threshold, open-drain reset supervisor with no user-controllable inputs.
What package type and dimensions does the MAX6381LT29D3+T use?
The MAX6381LT29D3+T is supplied in a 6-pin μDFN package (outline number 21-0147), measuring 1.5mm × 1.0mm with 0.5mm pin pitch and wettable flanks. This RoHS-compliant, lead-free package (denoted by "+T" suffix) is optimized for high-density PCB assembly and automated optical inspection, and is distinct from the 3-pin SC70 option used by other MAX6381 variants.
Can the MAX6381LT29D3+T operate reliably below 1.8V?
Yes - the MAX6381LT29D3+T is fully specified down to VCC = 1.0V. Its reset output remains valid and correctly asserted/deasserted even at 1.0V supply, and its supply current is characterized as low as 3μA at 1.8V and scales predictably lower at reduced voltages. This capability is explicitly guaranteed in the Absolute Maximum Ratings and Electrical Characteristics tables, enabling use in deep-brownout scenarios where other supervisors fail.
Is the MAX6381LT29D3+T pin-compatible with older Maxim reset ICs like the MAX809?
No - the MAX6381LT29D3+T uses a 6-pin μDFN package, whereas the MAX809 series uses 3-pin SOT23 or SC70 packages. Although the MAX6381–MAX6390 family is described as "pin compatible with MAX809/MAX810…" in the Features section, that statement applies only to the 3-pin SC70 variants (e.g., MAX6381XR29D3+T), not the μDFN-packaged MAX6381LT29D3+T. Pin mapping, footprint, and soldering requirements differ fundamentally.
MAX6381LT29D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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)
MAX6381LT29D3+T FAQ
1.How can I place an order for MAX6381LT29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT29D3+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 MAX6381LT29D3+T reliable?
The price and inventory of MAX6381LT29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381LT29D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT29D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT29D3+T?
MAX6381LT29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT29D3+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 MAX6381LT29D3+T?
For technical support, including MAX6381LT29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT29D3+T requirements.
6.How does Aetrix verify that MAX6381LT29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381LT29D3+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 MAX6381LT29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381LT29D3+T?
All MAX6381LT29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT29D3+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 MAX6381LT29D3+T part is unused and in its original packaging.
Return procedure for MAX6381LT29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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