My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6387XS31D3+
- Part No.:
- MAX6387XS31D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS31D3+.pdf
- Description:
- MAX6387 SC70, SINGLE LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:19,064
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6387XS31D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with active-low push-pull reset output, factory-set 3.08V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in portable/battery-powered systems.
For engineers reviewing the MAX6387XS31D3+ datasheet, MAX6387XS31D3+ pinout, MAX6387XS31D3+ application, or MAX6387XS31D3+ equivalent, key selection criteria include dual-supply monitoring capability, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over temperature, 3µA supply current at 1.8V, and SC70-4 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6387XS31D3+ integrates two independent voltage comparators: one monitors VCC against a factory-trimmed 3.08V threshold, while the second compares an external voltage at RESET IN to a precise +1.27V internal reference. Reset assertion occurs if either comparator detects an undervoltage condition.
Its internal timer guarantees a minimum 140ms reset pulse width after VCC or RESET IN recovers above their respective thresholds. The active-low push-pull RESET output drives valid logic levels down to VCC = 1V and supports direct interface with µP reset inputs without external pull-up components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| RESET Timeout Period | 140ms minimum - meets JEDEC JESD76 requirements for safe microprocessor initialization |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| RESET IN Threshold | +1.27V internal reference - allows user-defined secondary reset point via resistor divider |
| Operating Voltage Range | +1.0V to +5.5V - supports operation during deep brownout and compatibility with 1.2V–5V system rails |
| Reset Output Type | Active-low push-pull - eliminates need for external pull-up resistor and reduces BOM count |
| Temperature Range | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6387XS31D3+ uses a 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.55mm, suitable for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets fixed reset threshold |
| 2 | RESET | Active-low push-pull reset output; asserts low during VCC or RESET IN undervoltage and holds for 140ms minimum after recovery |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to +1.27V internal reference to enable dual-rail supervision |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold tracking |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of main VCC and secondary rail via RESET IN, enabling single-chip dual-power-system reset control |
| Factory-trimmed reset threshold | 3.08V ±2.5% over full temperature range eliminates need for external calibration or trimming resistors |
| Guaranteed reset validity to 1V | RESET output remains logically valid down to VCC = 1V - critical for fail-safe behavior during deep brownout |
| Ultra-low quiescent current | 3µA at 1.8V allows integration into energy-harvesting and coin-cell-powered devices without compromising runtime |
| SC70-4 footprint | 1.0mm × 1.0mm package enables placement adjacent to µP in space-constrained wearables and IoT edge nodes |
Applications
| Battery-Powered Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with separate 1.8V sensor rail and 3.3V MCU rail. IC Role / Device Role / Timing Role: Supervises both rails using VCC (3.3V) and RESET IN (1.8V via divider); asserts reset if either drops below threshold during cold start or battery depletion. Use Value: Prevents corrupted sensor data logging by ensuring MCU only boots when both power domains are stable for ≥140ms. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 5V field power and 3.3V logic supply. IC Role / Device Role / Timing Role: Monitors 5V field supply on VCC and 3.3V logic rail on RESET IN; triggers system-wide reset on either undervoltage event. Use Value: Eliminates need for two discrete supervisors, reducing component count and PCB area while maintaining functional safety compliance. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: BCM module operating from 12V battery (regulated to 5V/3.3V) with CAN transceiver requiring clean reset sequencing. IC Role / Device Role / Timing Role: Uses VCC to monitor 5V domain and RESET IN to supervise 3.3V CAN interface rail; provides synchronized reset pulse to MCU and transceiver. Use Value: Ensures CAN peripheral initializes only after stable 3.3V is confirmed, preventing bus arbitration errors during power-up. | Use Scenario: Revenue-grade electricity meter with backup supercapacitor and dual-rail SoC (1.2V core, 3.3V I/O). IC Role / Device Role / Timing Role: VCC monitors 3.3V I/O supply; RESET IN monitors 1.2V core via precision divider; asserts reset if either fails during capacitor discharge. Use Value: Guarantees meter firmware executes only when both voltage domains meet minimum operational specs, preserving metrological integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT31D3+ | Same electrical specs but in 6-pin µDFN-6 (1.5mm × 1.0mm) instead of SC70-4; higher thermal dissipation rating (167.7mW vs. 245mW) | Preferred for thermally demanding environments or when board layout allows larger footprint | Select LT version when thermal margin >10°C above ambient is required or when µDFN reflow profile is already established in production |
| TPS3808G33DBVR | 3.3V fixed threshold (not 3.08V); 200ms timeout (not 140ms); no RESET IN input; SOT-23-5 package | Lacks dual-rail monitoring; suited for single-supply systems where 3.3V threshold suffices | Choose TPS3808G33DBVR only when secondary rail supervision is unnecessary and 3.3V threshold aligns with system design |
Compared with MAX6387LT31D3+, the MAX6387XS31D3+ offers 35% smaller footprint and lower assembly cost in SC70-4, while the TPS3808G33DBVR trades dual-monitoring capability for TI's enhanced ESD robustness (4kV HBM) and tighter 0.5% threshold tolerance - making it viable only in single-rail, high-ESD-risk applications.
Availability
MAX6387XS31D3+ is available at Aetrix Electronics and suitable for battery-powered medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6387XS31D3+ 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, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.
The MAX6387XS31D3+ belongs to the MAX6381–MAX6390 family of ultra-low-power µP supervisory circuits, engineered specifically for dual-voltage monitoring in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6387XS31D3+ and how stable is it over temperature?
The MAX6387XS31D3+ has a factory-set VCC reset threshold of 3.08V nominal, with ±2.5% accuracy guaranteed over the full -40°C to +125°C operating range. This stability is achieved through laser-trimming during wafer sort and validated by production testing per Maxim's reliability standards. The MAX6387XS31D3+ maintains this specification without external components or calibration.
Does MAX6387XS31D3+ support monitoring of a second voltage rail, and how is it implemented?
Yes, the MAX6387XS31D3+ supports dual-rail supervision via its dedicated RESET IN pin, which compares an external voltage to a precise +1.27V internal reference. To set a custom threshold, connect a resistor divider between the secondary rail and ground, with the midpoint fed to RESET IN. The MAX6387XS31D3+ asserts reset if either VCC falls below 3.08V or the voltage at RESET IN drops below 1.27V.
What is the minimum reset timeout period of MAX6387XS31D3+, and is it guaranteed across temperature?
The MAX6387XS31D3+ provides a minimum reset timeout period of 140ms after VCC or RESET IN recovers above their respective thresholds. This timing is guaranteed over the full -40°C to +125°C temperature range and is implemented with a temperature-compensated RC oscillator, not a simple RC network - ensuring consistent behavior without external timing components.
Can MAX6387XS31D3+ operate reliably at very low supply voltages, and what is the lower limit?
Yes, the MAX6387XS31D3+ guarantees correct reset output logic states down to VCC = 1.0V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the device may cease operation, but the 1.0V guarantee ensures fail-safe behavior during gradual brownout conditions common in battery-powered systems before complete power loss.
What package type and dimensions does MAX6387XS31D3+ use, and is it RoHS-compliant?
The MAX6387XS31D3+ uses a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.55mm with 0.65mm pin pitch. It complies with RoHS Directive 2011/65/EU and is marked with "+" in the part number to denote lead-free construction. The SC70-4 footprint is compatible with standard reflow soldering profiles used for fine-pitch components.
MAX6387XS31D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.08V, Adj
- 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:
- SC-70-4
MAX6387XS31D3+ FAQ
1.How can I place an order for MAX6387XS31D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS31D3+ 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 MAX6387XS31D3+ reliable?
The price and inventory of MAX6387XS31D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS31D3+ is usually 5 days.
3.What payment methods are accepted for MAX6387XS31D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS31D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS31D3+?
MAX6387XS31D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS31D3+ 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 MAX6387XS31D3+?
For technical support, including MAX6387XS31D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS31D3+ requirements.
6.How does Aetrix verify that MAX6387XS31D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6387XS31D3+ 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 MAX6387XS31D3+ meets industry standards.
7.What is the process for return or replacement of MAX6387XS31D3+?
All MAX6387XS31D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS31D3+, 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 MAX6387XS31D3+ part is unused and in its original packaging.
Return procedure for MAX6387XS31D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6387XS31D3+ 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…
