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:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,339
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX6387XS31D3 from Maxim Integrated is a low-power microprocessor supervisory circuit with active-low push-pull reset output, factory-set 3.08V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in battery-powered embedded systems.
For engineers reviewing the MAX6387XS31D3 datasheet, MAX6387XS31D3 pinout, MAX6387XS31D3 application, or MAX6387XS31D3 equivalent, this device supports precise power-supply supervision in space-constrained, ultra-low-power designs requiring guaranteed reset assertion down to VCC = 1V and immunity to negative-going VCC transients.
Technical Context
The MAX6387XS31D3 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V threshold while simultaneously comparing an external voltage at RESET IN to a 1.27V internal reference. Its internal timer guarantees a minimum 140ms reset pulse after VCC recovery or RESET IN recovery.
It features a push-pull active-low RESET output capable of sinking 1.2mA at VCC ≥ 2.5V with VOL ≤ 0.3V, and includes no internal MR input-distinguishing it from MAX6384–MAX6386/MAX6390-while supporting auxiliary voltage supervision via high-impedance RESET IN (leakage ±50nA) with 4.5µs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (nominal), ±2.5% over –40°C to +125°C - ensures stable brownout detection across automotive/industrial temperature range |
| Reset Timeout | 140ms (min) - provides sufficient hold time for µP initialization before release |
| Supply Current | 3µA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up resistor; drives directly into µP reset pin |
| RESET IN Threshold | 1.27V (internal reference) - allows user-defined secondary reset point via resistor divider on RESET IN pin |
| VCC Operating Range | 1.0V to 5.5V - guarantees valid reset state down to 1V, critical for deep brownout recovery |
| Reset Propagation Delay | 35µs (VCC falling), 4.5µs (RESET IN falling) - enables fast response to supply glitches |
Pinout & Package
MAX6387XS31D3 is housed in a lead-free 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; powers internal circuitry and serves as primary reset voltage monitor |
| 2 | RESET | Active-low push-pull output; asserts low during reset condition and releases high after timeout |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to 1.27V internal reference to trigger reset if voltage falls below threshold |
| 4 | GND | Ground reference for all internal analog and digital functions; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN enables robust power sequencing in dual-supply SoC systems |
| Ultra-low quiescent current | 3µA at 1.8V allows integration into always-on sensor nodes without compromising battery life |
| Guaranteed reset validity to 1V | Ensures deterministic reset behavior during deep brownout, eliminating risk of undefined µP state |
| Negative transient immunity | Withstands VCC glitches up to 35µs duration (at 100mV overdrive), reducing false resets in noisy environments |
| Precision reset threshold | ±2.5% tolerance over full temperature range eliminates need for external calibration in industrial applications |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless environmental sensor operates from a CR2032 coin cell and must maintain reliable reset behavior across –25°C to +70°C ambient, with separate monitoring of core (1.8V) and I/O (3.3V) rails. IC Role / Device Role / Timing Role: MAX6387XS31D3 monitors 3.3V I/O supply with 3.08V threshold and uses RESET IN to supervise 1.8V core via resistor divider, asserting reset if either rail drops out. Use Value: Dual-rail supervision prevents partial initialization failures; 140ms timeout ensures full µP boot sequence completion before release. | Use Scenario: An isolated digital input module in a factory automation system requires fail-safe reset during 24V DC supply fluctuations and local 5V logic rail instability. IC Role / Device Role / Timing Role: MAX6387XS31D3 supervises the 5V logic rail (3.08V threshold) while RESET IN monitors a scaled-down version of the 24V field supply, triggering reset on either fault. Use Value: Eliminates need for two discrete supervisors; push-pull output drives optocoupler input directly without pull-up, saving board space and BOM cost. |
| Medical Wearable Monitor | Automotive Body Control Module (BCM) |
Use Scenario: A wearable ECG patch uses a single-cell Li-ion battery (2.7–4.2V) and must guarantee safe shutdown and restart under low-battery brownout conditions. IC Role / Device Role / Timing Role: MAX6387XS31D3 monitors battery voltage directly at VCC and uses RESET IN to track regulated 1.2V analog front-end supply, ensuring coordinated reset of digital and analog subsystems. Use Value: 3µA supply current extends runtime; 1V operational limit prevents spurious resets during deep discharge transitions. | Use Scenario: A BCM subassembly powers multiple CAN transceivers and microcontrollers from a shared 5V rail subject to load-dump transients and cold-crank voltage sag. IC Role / Device Role / Timing Role: MAX6387XS31D3 supervises main 5V rail (3.08V threshold) and uses RESET IN to monitor backup 3.3V domain, asserting reset if either fails during engine start. Use Value: 35µs VCC glitch rejection suppresses false triggers during cranking; push-pull output meets automotive reset timing requirements without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT31D3 | Same electrical specs but in 6-pin µDFN (1.5×1.0mm) instead of 4-pin SC70 (1.0×1.0mm); higher thermal mass and lower thermal resistance | Better suited for high-reliability industrial applications requiring enhanced thermal performance and board-level reworkability | Select when PCB layout allows larger footprint and thermal management is prioritized over minimal size |
| TPS3808G30DBVR | TI part with 3.0V threshold (±0.5% typical), 200ms timeout, 1.6µA ICC at 1.8V, but no RESET IN input - single-rail only | Lacks auxiliary voltage monitoring capability; requires separate supervisor or resistor network for dual-rail use | Choose only for single-supply systems where lowest possible current draw and tighter threshold tolerance are critical |
Compared with MAX6387LT31D3, the MAX6387XS31D3 offers superior space efficiency in ultra-compact designs; versus TPS3808G30DBVR, it delivers essential dual-rail supervision at the cost of slightly higher quiescent current and looser threshold tolerance.
Availability
MAX6387XS31D3 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, medical wearables, and automotive body control modules requiring stable component supply and long-term lifecycle support.
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 and mixed-signal ICs for demanding industrial, automotive, and computing applications, emphasizing reliability, low power, and small form factor.
The MAX6381–MAX6390 family was engineered specifically for ultra-low-power microprocessor supervision in space-constrained, wide-temperature environments-prioritizing guaranteed reset behavior, dual-rail monitoring, and minimal supply current.
FAQ
What is the exact reset threshold voltage of the MAX6387XS31D3?
The MAX6387XS31D3 has a factory-set nominal reset threshold of 3.08V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This value is fixed and cannot be adjusted externally; it applies strictly to the VCC supply monitoring function.
Does the MAX6387XS31D3 include a manual reset (MR) input?
No, the MAX6387XS31D3 does not feature a manual reset (MR) input. Unlike MAX6384–MAX6386 or MAX6390 variants, this part omits MR functionality. Its pinout consists solely of VCC, RESET, RESET IN, and GND - confirming dedicated dual-supply supervision without user-initiated reset capability.
How does the RESET IN pin function in the MAX6387XS31D3?
The RESET IN pin in the MAX6387XS31D3 connects to an internal comparator referenced to a precise 1.27V bandgap. When the voltage at RESET IN falls below 1.27V, the device asserts reset regardless of VCC status. Users typically apply a resistor divider to scale a second supply rail (e.g., 1.8V or 3.3V) to match this threshold, enabling true dual-voltage supervision.
What is the minimum VCC voltage at which the MAX6387XS31D3 guarantees correct RESET output logic state?
The MAX6387XS31D3 guarantees valid RESET output logic state down to VCC = 1.0V. Below this level, the internal circuitry may not operate reliably. This specification ensures deterministic reset behavior during deep brownout conditions, a key requirement for fail-safe embedded systems.
Can the MAX6387XS31D3 replace a MAX809 in an existing design?
The MAX6387XS31D3 is not a direct replacement for the MAX809 due to differences in pinout, reset threshold (3.08V vs. 2.93V/3.08V/3.3V options), and added RESET IN functionality. While both are push-pull active-low supervisors, the MAX6387XS31D3 requires PCB layout changes and verification of RESET IN handling; it is pin-incompatible with the 3-pin MAX809 SC70 package.
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:
- 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 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…
