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Analog Devices Inc./Maxim Integrated MAX6381XR31D1+T
- Part No.:
- MAX6381XR31D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR31D1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,572
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Product details
Overview
MAX6381XR31D1+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 3.08V reset threshold, 1ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors single supply voltage in battery-powered embedded systems, guarantees valid reset assertion during brownout, and consumes only 3μA at +1.8V. Used in portable instrumentation and critical μP power sequencing.
For engineers reviewing the MAX6381XR31D1+T datasheet, MAX6381XR31D1+T pinout, MAX6381XR31D1+T application, or MAX6381XR31D1+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), VCC-to-reset delay (35µs), guaranteed reset validity at VCC ≥ 1V, and SC70-3 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6381XR31D1+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over temperature, paired with a monolithic RC timer for deterministic 1ms reset timeout. Its open-drain RESET output requires an external pullup and asserts low when VCC falls below 3.08V, remaining asserted for ≥1ms after VCC recovers.
No manual reset (MR) or auxiliary RESET IN inputs are present - this variant is a minimal 3-pin configuration optimized for single-supply monitoring. The device operates across full industrial temperature range (−40°C to +125°C) and supports supply voltages from 1.0V to 5.5V, ensuring robustness in low-voltage microcontroller applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (±2.5% over −40°C to +125°C); ensures reliable detection of 3.3V rail brownout before µP malfunction. |
| Reset Timeout | 1ms minimum; provides sufficient hold time for µP internal state stabilization after power recovery. |
| Supply Current | 3μA at +1.8V; enables multi-year battery life in always-on sensor nodes and portable medical devices. |
| VCC Operating Range | 1.0V to 5.5V; supports direct interface with 1.2V/1.8V/2.5V/3.3V/5V logic domains without level-shifting. |
| VCC-to-RESET Delay | 35µs; fast response to rapid negative transients, minimizing false resets during switching noise. |
| Output Type | Active-low open-drain; allows wired-OR reset bus sharing and flexible pullup voltage selection (e.g., 1.8V or 3.3V). |
| Package | 3-pin SC70 (X3+2 outline); 1.25mm × 0.8mm footprint ideal for wearables and ultra-compact IoT modules. |
Pinout & Package
MAX6381XR31D1+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not electrically connected. Pin 1 = RESET (active-low open-drain), Pin 2 = VCC, Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain reset output | Asserts low when VCC < 3.08V; requires external pullup resistor; sinks up to 3.2mA at VCC ≥ 4.5V. |
| 2 - VCC | Power supply input | Monitored voltage source; also powers internal circuitry; absolute max rating −0.3V to +6.0V. |
| 3 - GND | Ground reference | Return path for VCC and RESET; must be low-impedance to ensure accurate threshold detection. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±2.5% tolerance over full temperature range - eliminates external resistor network and calibration effort. |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs duration at 100mV overdrive - prevents spurious resets in noisy DC-DC environments. |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery runtime in coin-cell–powered remote sensors and asset trackers. |
| Valid reset output down to VCC = 1.0V | Guaranteed logic state integrity during deep brownout - ensures µP remains held in reset until stable supply returns. |
| SC70-3 footprint compatibility | Pins match industry-standard 3-pin supervisory ICs (e.g., MAX809 series) - enables drop-in replacement on existing layouts. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG monitoring using coin-cell power with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.0V analog front-end and 1.8V MCU core; asserts reset if battery drops below 2.9V. Use Value: Prevents corrupted ADC sampling and firmware crashes during gradual battery depletion, extending usable battery life by 12%. |
Use Scenario: Environmental sensor node logging temperature/humidity every 5 minutes on AA batteries. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output powering MCU and flash memory; holds reset until VCC stabilizes post-wakeup. Use Value: Eliminates boot failures caused by LDO startup overshoot or undershoot, improving field reliability to >99.98% over 5-year deployment. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted I/O module with isolated 24V-to-3.3V conversion powering ARM Cortex-M4. IC Role / Device Role / Timing Role: Detects 3.3V rail collapse during ESD events or load dump; provides 1ms reset pulse to clear latch-up conditions. Use Value: Reduces field return rate by preventing persistent lockup after transient faults, meeting IEC 61000-4-2 Level 4 compliance. |
Use Scenario: Door module with LIN transceiver and 12V-to-1.2V/3.3V PMIC supplying MCU and CAN PHY. IC Role / Device Role / Timing Role: Monitors 3.3V domain feeding LIN controller; asserts reset during cold-crank (4.5V battery dip) to prevent bus arbitration errors. Use Value: Ensures deterministic LIN node reinitialization within 100ms of cranking completion, satisfying ISO 14229-1 diagnostic timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD1+T | Same 3-pin SC70 package, 3.08V threshold, but push-pull active-low output; higher ICC (12μA at 3.6V). | Lacks open-drain flexibility; cannot share reset bus with other supervisors or drive mixed-voltage logic. | Select when board already uses push-pull reset architecture and lowest possible BOM count is critical. |
| TPS3808G30DBVR | 3.0V threshold (±0.5%), 20ms min timeout, SOT-23-5 package; includes manual reset input and tighter tempco (30ppm/°C). | Requires PCB redesign (5-pin vs 3-pin); adds MR functionality unnecessary in fixed-supply applications. | Choose when higher threshold accuracy and longer timeout are required for safety-critical firmware validation. |
Compared with MAX809TRD1+T and TPS3808G30DBVR, MAX6381XR31D1+T offers optimal trade-off of ultra-low power (3μA), open-drain flexibility, and minimal footprint - making it preferred for battery-constrained, space-limited designs where reset bus sharing or mixed-voltage interfacing is needed.
Availability
MAX6381XR31D1+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR31D1+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, and computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits targeting space- and power-constrained embedded systems requiring guaranteed reset behavior across harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of MAX6381XR31D1+T?
The MAX6381XR31D1+T has a factory-set nominal reset threshold of 3.08V, 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 of the datasheet (suffix "31" corresponds to VTH = 3.00V min / 3.08V nom / 3.15V max), and applies specifically to the MAX6381XR31D1+T variant.
Does MAX6381XR31D1+T support manual reset functionality?
No, MAX6381XR31D1+T does not include a manual reset (MR) input. It is a 3-pin variant (RESET, VCC, GND) with no MR or RESET IN pins. Manual reset capability is only available in 4-pin SC70 or 6-pin µDFN variants such as MAX6384XRxxDx+T or MAX6390XSxxDx+T - confirmed by the Selector Guide and Pin Configurations section.
What is the minimum reset timeout period for MAX6381XR31D1+T?
The MAX6381XR31D1+T has a minimum reset timeout period of 1ms, as indicated by the "D1" suffix in its part number. This is verified in the Reset Timeout Delay table, where D1 specifies tRP = 1ms (min) / 2ms (max), and is consistent across all MAX6381 variants with that timing code.
Can MAX6381XR31D1+T operate with supply voltages below 1.8V?
Yes, MAX6381XR31D1+T operates from VCC = 1.0V to 5.5V. Its supply current is specified down to 1.0V (3–6μA), and the reset output remains guaranteed valid down to VCC = 1.0V - a key specification explicitly stated in the Electrical Characteristics table and Detailed Description section.
Is MAX6381XR31D1+T qualified for automotive applications?
No, MAX6381XR31D1+T is not automotive-qualified. Automotive versions carry the "/V" suffix (e.g., MAX6381XR31D1/V+T) and are AEC-Q100 qualified. The "+T" suffix denotes RoHS-compliant packaging only; the absence of "/V" confirms this part is rated for industrial temperature range (−40°C to +125°C) but not certified to automotive reliability standards.
MAX6381XR31D1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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:
- SC-70-3
MAX6381XR31D1+T FAQ
1.How can I place an order for MAX6381XR31D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR31D1+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 MAX6381XR31D1+T reliable?
The price and inventory of MAX6381XR31D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR31D1+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR31D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR31D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR31D1+T?
MAX6381XR31D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR31D1+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 MAX6381XR31D1+T?
For technical support, including MAX6381XR31D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR31D1+T requirements.
6.How does Aetrix verify that MAX6381XR31D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR31D1+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 MAX6381XR31D1+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR31D1+T?
All MAX6381XR31D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR31D1+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 MAX6381XR31D1+T part is unused and in its original packaging.
Return procedure for MAX6381XR31D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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