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Analog Devices Inc./Maxim Integrated MAX6387XS31D3-T
- Part No.:
- MAX6387XS31D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS31D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,443
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Product details
Overview
MAX6387XS31D3-T from Maxim Integrated is a dual-voltage 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 monitoring a second voltage source. It consumes only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V, used in battery-powered instrumentation and dual-rail embedded controllers.
For engineers reviewing the MAX6387XS31D3-T datasheet, MAX6387XS31D3-T pinout, MAX6387XS31D3-T application, or MAX6387XS31D3-T equivalent, key selection criteria include its 4-pin SC70 package, dual-supply monitoring capability, ±2.5% threshold accuracy across automotive temperature range, and compatibility with systems requiring guaranteed reset assertion during brownout and transient events.
Technical Context
The MAX6387XS31D3-T 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 asserts when either comparator trips, and remains asserted for 140ms after both inputs exceed their thresholds.
Its push-pull active-low RESET output drives directly without external pullup, supports sink currents up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V), and maintains logic validity down to VCC = 1V. The device features negative-going VCC transient immunity and operates across −40°C to +125°C with AEC-Q100 qualification support via /V suffix variants.
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 automotive and industrial environments |
| RESET Timeout Period | 140ms minimum - provides sufficient hold time for microprocessor initialization after power recovery |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered portable instruments |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor and reduces BOM count |
| Auxiliary Input | RESET IN with +1.27V reference - allows user-defined second-voltage monitoring via resistor divider |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial control applications |
| VCC Range | +1.0V to +5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
Pinout & Package
MAX6387XS31D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, optimized for space-constrained portable and automotive modules.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets reset threshold reference |
| 2 | RESET | Active-low push-pull output; asserts low during VCC or RESET IN fault and holds for 140ms post-recovery |
| 3 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | High-impedance auxiliary input; compared to +1.27V internal reference to detect secondary supply faults |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of main VCC and secondary rail via RESET IN, enabling robust dual-power-system reliability |
| Factory-trimmed precision threshold | 3.08V ±2.5% over full temperature range eliminates need for external calibration or trimming components |
| Low quiescent current | 3μA at +1.8V extends battery life in always-on sensor nodes and portable medical devices |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic μP reset behavior during severe brownout, preventing undefined processor states |
| Negative-going VCC transient immunity | Rejects sub-10µs glitches below reset threshold, reducing false resets in electrically noisy environments |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Battery-powered wireless temperature/humidity sensor operating on CR2032 coin cell with 3.3V MCU and 1.8V sensor interface. IC Role / Device Role / Timing Role: Supervises both 3.3V rail and 1.8V sensor supply; asserts reset if either drops below threshold during cold-start or battery sag. Use Value: Prevents firmware corruption by holding MCU in reset until both rails stabilize, leveraging 140ms timeout and dual-input fault detection. |
Use Scenario: Under-dash BCM with separate 5V microcontroller supply and 12V-to-3.3V converted I/O rail. IC Role / Device Role / Timing Role: Monitors 5V VCC and 3.3V I/O rail via RESET IN; triggers reset on ignition-cycle brownout or load-dump-induced dip. Use Value: Enables fail-safe restart after power interruption without external timing components, meeting ISO 16750-2 pulse immunity requirements. |
| Portable Medical Monitor | Dual-Rail FPGA Configuration System |
Use Scenario: Handheld ECG device using Li-ion battery, 3.3V system rail, and 1.2V analog front-end. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 1.2V AFE supply while VCC tracks 3.3V rail; asserts reset if either fails. Use Value: Guarantees clean startup sequence for mixed-signal SoC, avoiding analog bias errors caused by partial power-up. |
Use Scenario: Industrial FPGA board with 2.5V core and 3.3V I/O banks, requiring synchronized reset assertion. IC Role / Device Role / Timing Role: Configured with 2.5V VCC threshold and 3.3V rail monitored at RESET IN; ensures both domains are stable before releasing FPGA reset. Use Value: Eliminates need for discrete RC networks and dual-reset ICs, reducing layout complexity and improving timing margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT31D3-T | Same electrical specs but in 6-pin µDFN package; no SC70 footprint compatibility | Preferred for high-density PCBs where thermal performance (θJA = 477°C/W) or board-level reworkability matters | Select when µDFN's lower profile or improved thermal resistance justifies layout redesign. |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, open-drain output; requires external pullup; no auxiliary input | Lacks dual-voltage monitoring; suited for single-rail systems where RESET IN functionality is unnecessary | Choose only for cost-sensitive single-supply applications where auxiliary monitoring is not required. |
Compared with MAX6387XS31D3-T, the LT31D3 variant offers identical supervision functionality in a larger package with better thermal dissipation, while TPS3808G33DBVR provides lower-cost single-rail reset without dual-monitoring capability-making MAX6387XS31D3-T uniquely suited for compact, dual-rail safety-critical designs.
Availability
MAX6387XS31D3-T is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, portable medical monitors, and dual-rail FPGA configuration systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6387XS31D3-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, emphasizing low power, high reliability, and AEC-Q100 compliance.
The MAX6381–MAX6390 family delivers ultra-low-power, dual-voltage microprocessor supervisory circuits targeting battery-operated instrumentation, automotive subsystems, and systems requiring guaranteed reset integrity during brownout and transient events.
FAQ
What is the exact reset threshold voltage of MAX6387XS31D3-T?
The MAX6387XS31D3-T has a factory-set VCC reset threshold of 3.08V nominal, with 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, where suffix "31" corresponds to min/typ/max values of 3.00V/3.08V/3.15V at +25°C and maintains ±2.5% accuracy across temperature.
Does MAX6387XS31D3-T support monitoring of a second voltage rail?
Yes, MAX6387XS31D3-T includes a dedicated RESET IN pin that compares an external voltage to an internal +1.27V reference. When the voltage at RESET IN falls below this reference, the device asserts reset-enabling dual-rail supervision without additional ICs. This feature is explicitly documented in the Pin Description and Applications Information sections.
What is the reset timeout duration for MAX6387XS31D3-T?
The MAX6387XS31D3-T provides a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This value is guaranteed per the Reset Timeout Delay table and applies to both VCC-initiated and RESET IN-initiated reset events, ensuring sufficient hold time for microprocessor initialization.
Is MAX6387XS31D3-T compatible with standard SC70 footprints?
Yes, MAX6387XS31D3-T uses the 4-pin SC70 package (outline 21-0098, land pattern 90-0187), which is industry-standard and compatible with automated pick-and-place equipment and reflow soldering profiles. Its pinout matches the MAX6384–MAX6390 SC70 variants shown in the Pin Configurations section.
What is the supply current consumption of MAX6387XS31D3-T at 1.8V?
The MAX6387XS31D3-T draws only 3μA typical supply current at +1.8V (with no load), as specified in the Electrical Characteristics table under "VCC Supply Current." This ultra-low quiescent current enables multi-year operation in battery-powered applications such as portable instrumentation and wireless sensors.
MAX6387XS31D3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- 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-T FAQ
1.How can I place an order for MAX6387XS31D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS31D3-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 MAX6387XS31D3-T reliable?
The price and inventory of MAX6387XS31D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS31D3-T is usually 5 days.
3.What payment methods are accepted for MAX6387XS31D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS31D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS31D3-T?
MAX6387XS31D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS31D3-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 MAX6387XS31D3-T?
For technical support, including MAX6387XS31D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS31D3-T requirements.
6.How does Aetrix verify that MAX6387XS31D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS31D3-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 MAX6387XS31D3-T meets industry standards.
7.What is the process for return or replacement of MAX6387XS31D3-T?
All MAX6387XS31D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS31D3-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 MAX6387XS31D3-T part is unused and in its original packaging.
Return procedure for MAX6387XS31D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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