My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6381XR31D2+T
- Part No.:
- MAX6381XR31D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR31D2+T.pdf
- Description:
- IC MPU/RESET CIRC 3.10V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,174
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6381XR31D2+T from Maxim Integrated is a micropower voltage supervisor IC with factory-set 3.08V reset threshold, 20ms minimum reset timeout, and active-low open-drain reset output. It monitors single supply rails from +1.8V to +5.0V, consumes only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR31D2+T datasheet, MAX6381XR31D2+T pinout, MAX6381XR31D2+T application, or MAX6381XR31D2+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), negative-going VCC transient immunity, low supply current, SC70-3 package footprint, and compatibility with critical μP reset input timing requirements.
Technical Context
The MAX6381XR31D2+T implements a precision bandgap-based voltage comparator with ±2.5% reset threshold tolerance across −40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed minimum 20ms reset assertion after VCC rises above 3.08V.
This variant belongs to the MAX6381 series with open-drain active-low RESET output, no manual reset (MR) input, and no auxiliary RESET IN pin. It operates from 1.0V to 5.5V supply and maintains correct logic state on RESET down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal (suffix "31"), ±2.5% over −40°C to +125°C - ensures reliable detection of 3.3V rail brownout |
| Reset Timeout | 20ms minimum (suffix "D2") - meets μP minimum reset pulse width requirements for stable boot |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Output Type | Active-low open-drain - requires external pullup; supports wired-OR reset bus configurations |
| Operating Voltage | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout recovery |
| Temperature Range | −40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Package | 3-pin SC70 (SOT-323) - 1.25mm × 0.85mm footprint, compatible with high-density PCB layouts |
Pinout & Package
MAX6381XR31D2+T is housed in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208), with 0.65mm pitch and thermal resistance θJA = 340.4°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; must be pulled up externally; sinks ≥80µA at VCC ≥1.0V |
| 2 | VCC | Primary supply input and monitored voltage rail; accepts 1.0V–5.5V; powers internal circuitry |
| 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±2.5% tolerance over full temperature range - eliminates external resistor divider calibration |
| Negative-going VCC transient immunity | Rejects glitches ≤100µs wide when VCC drops 100mV below threshold - prevents spurious resets in noisy power systems |
| Ultra-low quiescent current | 3μA at +1.8V - extends battery life in always-on monitoring applications without compromising supervision integrity |
| Valid reset output down to VCC = 1V | Guaranteed logic state on RESET pin until supply collapses - ensures deterministic μP initialization sequence |
| SC70-3 package compatibility | Pins match industry-standard SOT-323 footprint - enables drop-in replacement for legacy supervisors like MAX809 |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell with 3.3V LDO output. IC Role / Device Role / Timing Role: Monitors LDO output and asserts open-drain RESET to microcontroller upon brownout or power-up. Use Value: 3μA supply current extends battery life beyond 2 years; 20ms timeout satisfies ARM Cortex-M0+ reset timing spec. |
Use Scenario: DIN-rail mounted programmable logic controller with dual 24V/5V supplies. IC Role / Device Role / Timing Role: Supervises 5V logic rail; open-drain output interfaces with shared system reset bus. Use Value: −40°C to +125°C rating ensures reliability in unventilated enclosures; ±2.5% threshold accuracy prevents false trips during ambient temperature swings. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: BCM module receiving switched 12V converted to 3.3V via buck regulator. IC Role / Device Role / Timing Role: Detects regulator failure or load dump-induced sag on 3.3V rail; drives RESET line low. Use Value: AEC-Q100 qualified version available; 3.08V threshold aligns with 3.3V rail ±3% tolerance; SC70-3 saves space in tight fuse box layouts. |
Use Scenario: Revenue-grade meter with isolated MCU and metrology ASIC powered from 3.3V rail. IC Role / Device Role / Timing Role: Provides fail-safe reset during AC mains interruption or capacitor discharge decay. Use Value: Valid RESET output down to VCC = 1V ensures clean restart as backup capacitor discharges; 20ms timeout exceeds ANSI C12.1 requirement for meter reset hold time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | Same 3.08V threshold and 20ms timeout, but push-pull active-low output; higher ICC (12μA at +3.6V) | Requires no external pullup; less suitable for wired-OR buses | Select when board layout lacks space for pullup resistor or when driving capacitive loads >50pF |
| TPS3808G30DBVR | 3.0V threshold (±0.5%), 20ms timeout, push-pull active-low; 1.6μA ICC at +3.6V; supports enable input | Lower threshold tolerance and additional EN pin enable sequencing control | Select when tighter threshold accuracy or power sequencing coordination with other rails is required |
Compared with MAX6381XR31D2+T, MAX809TRD2+T offers simpler interface but higher current draw, while TPS3808G30DBVR delivers superior threshold precision and sequencing flexibility at the cost of added pin count and non-drop-in layout compatibility.
Availability
MAX6381XR31D2+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6381XR31D2+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.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor reset in space-constrained, battery-sensitive, and thermally harsh environments.
FAQ
What is the exact reset threshold voltage of MAX6381XR31D2+T?
The MAX6381XR31D2+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 defined by the "31" suffix per Maxim's Reset Threshold table and is trimmed using precision bandgap references during production.
Does MAX6381XR31D2+T include a manual reset input (MR)?
No, MAX6381XR31D2+T does not feature a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Manual reset capability is only present in MAX6384–MAX6386 and MAX6390 variants, as confirmed in the Selector Guide and Pin Description sections of the datasheet.
What package type and dimensions does MAX6381XR31D2+T use?
MAX6381XR31D2+T uses a 3-pin SC70 package (also referenced as SOT-323), measuring 1.25mm × 0.85mm with 0.65mm lead pitch. The package outline number is 21-0075, and the recommended land pattern is 90-0208 - both documented in Maxim's official Package Information table.
Can MAX6381XR31D2+T monitor a second voltage rail?
No, MAX6381XR31D2+T cannot monitor a second voltage rail. Auxiliary RESET IN functionality is exclusive to MAX6387/MAX6388/MAX6389 variants, as explicitly stated in the General Description and Selector Guide. The MAX6381 series supervises only the VCC supply pin.
Is MAX6381XR31D2+T qualified for automotive applications?
The base MAX6381XR31D2+T is not automotive-qualified; however, the /V variant (e.g., MAX6381XR31D2/V+T) is AEC-Q100 qualified. The "/V" suffix denotes automotive qualification, and ordering information confirms −40°C to +125°C operation with automotive-grade screening - essential for under-hood and body electronics deployment.
MAX6381XR31D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR31D2+T FAQ
1.How can I place an order for MAX6381XR31D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR31D2+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 MAX6381XR31D2+T reliable?
The price and inventory of MAX6381XR31D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR31D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR31D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR31D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR31D2+T?
MAX6381XR31D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR31D2+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 MAX6381XR31D2+T?
For technical support, including MAX6381XR31D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR31D2+T requirements.
6.How does Aetrix verify that MAX6381XR31D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR31D2+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 MAX6381XR31D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR31D2+T?
All MAX6381XR31D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR31D2+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 MAX6381XR31D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR31D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6381XR31D2+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
