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Analog Devices Inc./Maxim Integrated MAX6381XR18D2+T
- Part No.:
- MAX6381XR18D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR18D2+T.pdf
- Description:
- IC MPU/RESET CIRC 1.80V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
MAX6381XR18D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 1.8V reset threshold, 20ms minimum reset timeout, and active-low open-drain reset output. It monitors VCC from +1.0V to +5.5V, 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 MAX6381XR18D2+T datasheet, MAX6381XR18D2+T pinout, MAX6381XR18D2+T application, or MAX6381XR18D2+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), negative-going transient immunity, manual reset compatibility, and SC70-3 package footprint constraints.
Technical Context
The MAX6381XR18D2+T implements a precision voltage comparator with internal 1.8V reference and an on-chip timer for fixed 20ms reset assertion after VCC recovery. Its open-drain RESET output requires an external pullup resistor and remains asserted during VCC drop below 1.8V or during power-up until the timeout elapses.
It operates across −40°C to +125°C with ±2.5% reset threshold accuracy over temperature and exhibits 60ppm/°C tempco. The device guarantees correct logic state of RESET down to VCC = 1V and provides 35µs power-down reset delay with immunity to sub-100ns glitches on VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8V nominal, ±2.5% over −40°C to +125°C - ensures consistent brownout detection across automotive and industrial temperature ranges |
| Reset Timeout | 20ms minimum - holds μP in reset long enough for stable clock and supply settling after power-up or recovery |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Operating Voltage Range | +1.0V to +5.5V - supports direct monitoring of core rails (1.2V, 1.8V, 3.3V) and I/O supplies without level-shifting |
| RESET Output Type | Active-low open-drain - allows wired-OR reset bus sharing and flexible voltage-level translation via external pullup |
| Reset Assertion Delay | 35µs (VCC falling at 10mV/µs) - rejects fast transients while responding promptly to sustained undervoltage |
| Output Sink Capability | 3.2mA at VCC ≥ 4.5V, VOL ≤ 0.4V - drives standard CMOS inputs and small capacitive loads without buffering |
Pinout & Package
MAX6381XR18D2+T is housed in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm. This ultra-small footprint suits space-constrained portable and wearable designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; asserts low when VCC < 1.8V or during power-up |
| 2 | VCC | Main supply input and monitored voltage rail; accepts +1.0V to +5.5V; powers internal comparators and timer |
| 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.8V reset threshold | Eliminates external resistor divider; reduces BOM count and layout area in compact μP reset circuits |
| 20ms guaranteed reset timeout | Ensures sufficient hold time for oscillator startup and PLL lock in ARM Cortex-M and RISC-V SoCs |
| 3μA supply current at 1.8V | Extends battery life in always-on sensor nodes where supervisory current dominates quiescent draw |
| Valid RESET output down to VCC = 1V | Prevents spurious release during deep brownout, avoiding undefined μP behavior before full supply recovery |
| Negative-going transient immunity | Rejects >100mV, <1µs VCC glitches-critical for noisy DC-DC converter outputs in motor control and automotive ECUs |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output to assert reset during battery sag below 1.8V and hold μP in reset for 20ms after recovery. Use Value: Prevents firmware crash during voltage droop caused by RF transmit bursts; enables reliable cold-start after deep discharge. |
Use Scenario: LoRaWAN soil moisture sensor deployed in remote fields with solar charging and seasonal temperature swings. IC Role / Device Role / Timing Role: Supervises 3.3V system rail across −40°C to +85°C ambient; triggers reset on winter low-temp brownout. Use Value: ±2.5% threshold accuracy ensures consistent trip point despite temperature drift; 3μA ICC preserves charge budget. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted analog input module powered from 24V DC-DC with local 3.3V/1.8V regulation. IC Role / Device Role / Timing Role: Resets microcontroller upon 1.8V core rail dropout due to load dump or ESD event on field wiring. Use Value: Open-drain output interfaces cleanly with existing 3.3V reset bus; 35µs response rejects switching noise from adjacent SMPS. |
Use Scenario: Door module with LIN interface, MCU, and LED drivers exposed to automotive load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Provides AEC-Q100–compliant reset supervision for 1.8V domain under −40°C to +125°C junction temperature. Use Value: Valid operation down to VCC = 1V prevents premature release during cold-crank (battery dips to ~6V, LDOs sag); SC70-3 eases placement near MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR18D2+T | Same 1.8V threshold, 20ms timeout, and SC70-3 package; push-pull active-low output instead of open-drain | Requires no external pullup; incompatible with shared reset buses or mixed-voltage systems needing level translation | Select when board-level reset net is dedicated and driven only by this IC |
| TPS3123E18DBVR | 1.8V threshold, 200ms timeout (not 20ms); SOT-23-3 package; ±0.5% initial accuracy but only rated to +85°C | Lacks extended temperature range and short timeout needed for fast-boot MCUs; higher accuracy insufficient to offset timing mismatch | Consider only for cost-sensitive commercial-grade applications where 200ms timeout is acceptable |
Compared with MAX6381XR18D2+T, MAX6326XR18D2+T simplifies layout by eliminating the pullup resistor but sacrifices bus-sharing flexibility, while TPS3123E18DBVR trades critical timing fidelity and temperature robustness for marginal accuracy gain-neither offers true drop-in replacement capability.
Availability
MAX6381XR18D2+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6381XR18D2+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 demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability performance.
The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits optimized for space-constrained, battery-sensitive systems requiring guaranteed reset behavior across harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of MAX6381XR18D2+T and how stable is it over temperature?
The MAX6381XR18D2+T has a nominal reset threshold of 1.8V, with guaranteed tolerance of ±2.5% over the full operating range of −40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning the threshold shifts less than 15mV across a 100°C span. This stability ensures repeatable brownout detection in automotive and industrial applications where ambient temperature varies widely.
Does MAX6381XR18D2+T include a manual reset input (MR)?
No, MAX6381XR18D2+T does not feature a manual reset input. Only MAX6384–MAX6386 and MAX6390 variants include MR functionality. The MAX6381XR18D2+T is a basic single-supply supervisor with VCC monitoring only-its pinout (RESET, VCC, GND) confirms absence of MR terminal, and the datasheet explicitly assigns MR to other members of the family.
What is the minimum VCC required for MAX6381XR18D2+T to guarantee correct RESET output logic state?
MAX6381XR18D2+T guarantees valid RESET output state down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain defined logic levels. This specification ensures reliable reset assertion during deep brownout events common in battery-powered systems, preventing premature μP release before supply stabilization.
Can MAX6381XR18D2+T monitor a second voltage rail like some other family members?
No, MAX6381XR18D2+T does not support auxiliary voltage monitoring. The RESET IN function is exclusive to MAX6387–MAX6389 variants and is absent in MAX6381XR18D2+T. Its pin configuration and functional description confirm it monitors VCC only; no internal comparator or dedicated input exists for secondary rail supervision.
What package type and dimensions does MAX6381XR18D2+T use, and is it RoHS-compliant?
MAX6381XR18D2+T uses a 3-pin SC70 package (outline 21-0075), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This ultra-compact footprint is ideal for wearables, hearing aids, and other miniaturized electronics where board area is at a premium.
MAX6381XR18D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR18D2+T FAQ
1.How can I place an order for MAX6381XR18D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR18D2+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 MAX6381XR18D2+T reliable?
The price and inventory of MAX6381XR18D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR18D2+T is usually 5 days.
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MAX6381XR18D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR18D2+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 MAX6381XR18D2+T?
For technical support, including MAX6381XR18D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR18D2+T requirements.
6.How does Aetrix verify that MAX6381XR18D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR18D2+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 MAX6381XR18D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR18D2+T?
All MAX6381XR18D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR18D2+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 MAX6381XR18D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR18D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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