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Analog Devices Inc./Maxim Integrated MAX6381LT29D3+
- Part No.:
- MAX6381LT29D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6381LT29D3+.pdf
- Description:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:1,600
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Product details
Overview
MAX6381LT29D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.93V reset threshold, 140ms minimum reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors single-supply voltages in portable/battery-powered equipment and industrial embedded systems where ultra-low quiescent current (3µA at +1.8V) and precise brownout detection are critical.
For engineers reviewing the MAX6381LT29D3+ datasheet, MAX6381LT29D3+ pinout, MAX6381LT29D3+ application, or MAX6381LT29D3+ equivalent, key selection factors include its ±2.5% reset threshold accuracy over –40°C to +125°C, negative-going VCC transient immunity, SC70-3/µDFN-6 package options, and compatibility with dual-voltage monitoring architectures via auxiliary reset input variants.
Technical Context
The MAX6381LT29D3+ implements a precision bandgap reference and comparator-based reset generator with internal timer logic for deterministic reset assertion during power-up, brownout, and power-down events. Its reset output remains valid down to VCC = 1.0V, ensuring reliable µP initialization even under severe supply droop.
Unlike manual-reset or dual-input variants (e.g., MAX6384/MAX6387), the MAX6381LT29D3+ is a single-supply, no-MR, no-RESETIN configuration-dedicated solely to VCC monitoring with fixed 2.93V threshold and 140ms timeout. It uses BiCMOS process technology and contains 647 transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (nominal), ±2.5% over –40°C to +125°C - ensures accurate brownout detection across automotive/industrial temperature range |
| Reset Timeout | 140ms (minimum) - guarantees sufficient µP hold time for stable clock and memory initialization |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in always-on sensor nodes and wearables |
| Operating Voltage | +1.0V to +5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| Output Type | Active-low open-drain - allows wired-OR reset bus sharing and flexible pull-up voltage selection (e.g., 3.3V reset on 1.8V core) |
| Reset Propagation Delay | 35µs (VCC falling at 10mV/µs) - fast response to rapid supply collapse without false triggering |
| VCC Immunity | Negative-going transient rejection up to 35µs at 100mV overdrive - suppresses noise-induced resets in noisy power rails |
Pinout & Package
MAX6381LT29D3+ is available in 3-pin SC70 (X3-2) and 6-pin µDFN-6 (L611-1) packages. The SC70-3 variant uses all three pins functionally; the µDFN-6 includes two no-connect (N.C.) terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output requiring external pull-up; sinks 80µA at VOL ≤ 0.3V when asserted |
| 2 | VCC | Main supply input and monitored voltage source; powers internal circuitry and defines reset threshold reference point |
| 3 | GND | Analog/digital ground reference; must be low-impedance connection to avoid threshold shift or timing jitter |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±2.5% tolerance over full temperature range - eliminates external resistor calibration and reduces BOM count |
| Ultra-low supply current | 3µA at +1.8V - extends battery runtime in energy-constrained IoT endpoints without sacrificing reset reliability |
| Valid reset output at low VCC | Guaranteed correct logic state down to VCC = 1.0V - prevents spurious release during deep undervoltage recovery |
| Transient-immune comparator | Rejects VCC glitches <35µs at 100mV overdrive - avoids false resets in switching regulator or motor-drive environments |
| Open-drain output architecture | Enables level-shifting and multi-source reset bus arbitration - supports mixed-voltage system designs (e.g., 1.8V core + 3.3V I/O) |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by coin-cell battery with 1.8V MCU core and 3.3V BLE radio. IC Role / Device Role / Timing Role: Supervises 1.8V supply rail; asserts open-drain RESET to both MCU and radio upon brownout; pull-up to 3.3V ensures clean reset edge for RF subsystem. Use Value: 3µA quiescent current extends battery life beyond 2 years; 2.93V threshold aligns precisely with MCU's 1.8V supply dropout margin. | Use Scenario: DIN-rail mounted analog input module operating in factory ambient (-40°C to +85°C) with 24V DC input converted to 3.3V/1.2V rails. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail; provides 140ms reset pulse to ARM Cortex-M4 to ensure ADC calibration completes before firmware execution. Use Value: ±2.5% threshold accuracy over temperature prevents premature reset assertion during thermal cycling; SC70-3 footprint minimizes PCB area in space-constrained modules. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: Revenue-grade electricity meter with isolated power supply and dual-core SoC (1.1V core, 3.3V interface). IC Role / Device Role / Timing Role: Resets 3.3V domain on power-up; open-drain output pulled to 3.3V ensures compatibility with SoC's reset input voltage rating. Use Value: 140ms timeout exceeds typical isolated DC-DC startup delay; 1.0V operational lower limit covers worst-case cold-start scenarios. | Use Scenario: Door module with LIN transceiver and 5V microcontroller, exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Detects 5V rail collapse during battery disconnection; asserts reset before MCU enters undefined state during voltage sag. Use Value: Negative-going transient immunity rejects 30µs spikes common in automotive 12V systems; -40°C to +125°C rating matches AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP 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; higher ICC (15µA typical) | Requires dedicated reset net (no shared bus); less suitable for level-shifted or wired-OR configurations | Select when board layout lacks space for pull-up resistor or when driving capacitive loads >50pF directly |
| TPS3808G33DBVR | 2.93V threshold, 200ms timeout (not 140ms); 1.4µA ICC at 1.8V; SOT-23-5 package with manual reset input | Includes MR pin (unused here) and different pinout; tighter threshold accuracy (±0.5%) but longer timeout may delay system boot | Select when lowest possible current dominates and 200ms reset hold is acceptable for target µP initialization sequence |
Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6381LT29D3+ uniquely balances ultra-low ICC (3µA), exact 140ms timeout, and open-drain flexibility-making it optimal for compact, battery-sensitive designs requiring reset bus sharing or mixed-voltage coordination.
Availability
MAX6381LT29D3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381LT29D3+ 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 power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6381–MAX6390 family delivers single/dual low-voltage, low-power µP reset circuits optimized for battery-operated and thermally demanding systems where supply monitoring accuracy, minimal current draw, and small footprint are essential.
FAQ
What is the exact reset threshold voltage of MAX6381LT29D3+ and how stable is it over temperature?
The MAX6381LT29D3+ has a nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% across the full operating temperature range of –40°C to +125°C. This stability is achieved using a precision bandgap reference and laser-trimmed resistive divider, ensuring consistent brownout detection without external calibration. The MAX6381LT29D3+ maintains this accuracy without requiring derating or additional compensation circuits.
Does MAX6381LT29D3+ support manual reset functionality?
No, the MAX6381LT29D3+ does not include a manual reset (MR) input. It is a basic single-supply supervisory device configured exclusively for VCC monitoring. Manual reset capability is present only in variants like MAX6384, MAX6385, MAX6386, and MAX6390. Using MAX6381LT29D3+ in a design requiring operator-initiated reset would necessitate external logic or a different part number.
What package options are available for MAX6381LT29D3+ and are they pin-compatible?
The MAX6381LT29D3+ is offered in two packages: 3-pin SC70 (X3-2) and 6-pin µDFN-6 (L611-1). These are not pin-compatible - the SC70-3 uses pins 1–3 for RESET/VCC/GND, while the µDFN-6 places RESET/VCC/GND on pins 1/2/6 with pins 3 and 5 as N.C. Layouts must be designed separately for each variant; no shared footprint exists between them.
Can MAX6381LT29D3+ monitor a second voltage rail such as a core supply?
No, the MAX6381LT29D3+ monitors only the VCC supply rail. Auxiliary voltage monitoring via RESET IN is implemented only in MAX6387, MAX6388, MAX6389, and MAX6390 variants. For dual-rail supervision (e.g., 3.3V I/O + 1.2V core), designers must select one of those parts or use two discrete MAX6381LT29D3+ devices with separate pull-ups.
What is the minimum VCC voltage at which MAX6381LT29D3+ guarantees valid reset output behavior?
The MAX6381LT29D3+ guarantees correct reset output logic state down to VCC = 1.0V. Below this voltage, the internal comparator and timer may become indeterminate. This feature ensures reliable reset assertion during deep brownout conditions - critical for preventing MCU lockup in battery-powered systems where VCC can sag below nominal levels before shutdown.
MAX6381LT29D3+ 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:
- Power Supply Monitor
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX6381LT29D3+ FAQ
1.How can I place an order for MAX6381LT29D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381LT29D3+ 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+ reliable?
The price and inventory of MAX6381LT29D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381LT29D3+ is usually 5 days.
3.What payment methods are accepted for MAX6381LT29D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381LT29D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381LT29D3+?
MAX6381LT29D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381LT29D3+ 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+?
For technical support, including MAX6381LT29D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381LT29D3+ requirements.
6.How does Aetrix verify that MAX6381LT29D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6381LT29D3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6381LT29D3+?
All MAX6381LT29D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381LT29D3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6381LT29D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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