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Analog Devices Inc./Maxim Integrated MAX6385XS37D4-T
- Part No.:
- MAX6385XS37D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS37D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
MAX6385XS37D4-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit with factory-set 3.70V reset threshold, 1120ms VCC reset timeout, and debounced manual reset input (MR). It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and operates across -40°C to +125°C - ideal for battery-powered microcontroller systems requiring reliable power-on reset and field-serviceable manual reset.
For engineers reviewing the MAX6385XS37D4-T datasheet, MAX6385XS37D4-T pinout, MAX6385XS37D4-T application, or MAX6385XS37D4-T equivalent, key selection criteria include its precise 3.70V ±2.5% threshold accuracy over temperature, MR input with internal 63kΩ pullup, SC70-4 package footprint, and compatibility with dual-voltage monitoring architectures where auxiliary reset inputs are not required.
Technical Context
The MAX6385XS37D4-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over -40°C to +125°C and 60ppm/°C tempco, paired with a monolithic RC timer generating a guaranteed minimum 1120ms reset assertion after VCC recovery. Its active-high push-pull RESET output drives high during fault conditions and deasserts cleanly without external pullup.
It integrates a debounced manual reset input (MR) with 1µs minimum pulse width support, 100ns glitch rejection, and 200ns MR-to-RESET delay - enabling robust reset initiation via momentary switch or logic signal without external RC filtering. The MR pin features an internal 63kΩ pullup resistor to VCC, eliminating need for discrete components in most implementations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.70V ±2.5% over -40°C to +125°C - ensures deterministic reset activation across automotive and industrial temperature ranges |
| VCC Reset Timeout | 1120ms minimum - holds processor in reset long enough for power rail stabilization and clock lock in embedded systems |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable instrumentation |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion even during deep brownout down to 1V, critical for graceful shutdown |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and reduces BOM count vs. open-drain alternatives |
| Manual Reset Input | MR with 63kΩ internal pullup - allows direct connection of normally-open switch to GND; no external components required |
| Package | 4-pin SC70 (X4+1 outline) - 1.3mm × 1.6mm footprint compatible with space-constrained PCB layouts |
Pinout & Package
MAX6385XS37D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.6mm × 0.95mm with gull-wing leads. Thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and serves as reference for reset threshold detection |
| 2 | RESET | Active-high push-pull output; drives high during reset condition and low when system is stable - directly interfaces with μP RESET pin |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 63kΩ resistor - assert by grounding to force system reset |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold sensing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.70V with ±2.5% tolerance over full temperature range - eliminates need for external resistor dividers or calibration |
| Guaranteed reset validity | RESET output state remains valid down to VCC = 1.0V - ensures deterministic behavior during deep undervoltage events |
| Integrated MR debounce | No external RC network required; 100ns glitch rejection and 1µs minimum pulse width support robust switch interfacing |
| Negative-going transient immunity | Immune to VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Low-quiescent-current design | 3μA at +1.8V supply - extends battery life in always-on monitoring applications such as smart meters and wearables |
Applications
| Industrial PLC Controller | Battery-Powered Data Logger |
|---|---|
Use Scenario: Monitors 3.3V I/O supply and 1.8V core rail in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for ARM Cortex-M7 MCU; asserts active-high RESET until both supplies stabilize above 3.70V for ≥1120ms. Use Value: Prevents firmware corruption during unstable AC line transients and ensures deterministic boot sequence without external timing components. | Use Scenario: Embedded in environmental sensor nodes powered by CR2032 coin cell, logging temperature/humidity every 5 minutes with ultra-low sleep current. IC Role / Device Role / Timing Role: Supervises 3.0V regulated supply; guarantees reset assertion during battery voltage sag below 3.70V and enables field reset via tactile switch on MR pin. Use Value: Enables >5-year battery life due to 3μA quiescent current and eliminates need for external pullup or debounce circuitry on MR. |
| Dual-Voltage Microcontroller System | Automotive Body Control Module |
Use Scenario: Used in medical handheld devices with separate 5.0V analog front-end and 1.2V digital core, requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Monitors only the 5.0V rail but provides sufficient hold time (1120ms) to allow downstream LDOs to settle before releasing μP reset. Use Value: Simplifies power sequencing design by decoupling reset timing from core voltage ramp rate while maintaining single-chip supervision. | Use Scenario: Installed in door module ECUs operating in under-hood environments where supply voltage dips occur during load dump or cold-cranking. IC Role / Device Role / Timing Role: Detects 3.70V threshold violation on 5V domain; delivers clean active-high reset with 1120ms timeout to Infineon AURIX™ TC3xx MCU. Use Value: Meets AEC-Q100 Grade 1 requirements (−40°C to +125°C) and withstands negative VCC transients up to 35µs without false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS37D3-T | 140ms VCC reset timeout vs. 1120ms; otherwise identical threshold, package, and MR functionality | Suitable for fast-booting systems where shorter reset hold time is acceptable | Select when faster system initialization is prioritized over extended power-rail stabilization time |
| TLV803EB37DBZR | 3.7V threshold, 200ms timeout, SOT-23-3 package, no MR input, 0.5μA typical ICC | Lacks manual reset capability and uses smaller 3-pin footprint - trade-off between size and feature set | Choose for space-constrained designs where MR is unnecessary and ultra-low ICC is critical |
Compared with MAX6385XS37D3-T and TLV803EB37DBZR, the MAX6385XS37D4-T uniquely balances long-reset reliability (1120ms), integrated manual reset, and industry-standard SC70-4 footprint - making it optimal for industrial and automotive applications demanding both robustness and serviceability.
Availability
MAX6385XS37D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, dual-voltage microcontroller systems, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6385XS37D4-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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6381–MAX6390 family delivers low-power, factory-trimmed μP supervisory circuits optimized for reliable reset generation in space- and power-constrained embedded systems - with emphasis on temperature stability, transient immunity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6385XS37D4-T and how stable is it over temperature?
The MAX6385XS37D4-T has a factory-set nominal reset threshold of 3.70V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. This corresponds to a minimum threshold of 3.61V and maximum of 3.79V at temperature extremes. The device achieves this stability using a precision bandgap reference and laser-trimmed resistive divider, with a tempco of 60ppm/°C - ensuring consistent reset behavior in automotive and industrial environments.
Does the MAX6385XS37D4-T require external components to operate, and what is the role of the MR pin?
No, the MAX6385XS37D4-T requires no external components for basic operation. Its MR (manual reset) pin features an internal 63kΩ pullup resistor to VCC, allowing direct connection of a normally-open momentary switch to GND to initiate a system reset. When MR is pulled low, the device asserts its active-high RESET output for the full 1120ms timeout period after MR is released - enabling field serviceability without adding capacitors or resistors to the schematic.
What package type and footprint does the MAX6385XS37D4-T use, and is it RoHS-compliant?
The MAX6385XS37D4-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 1.3mm × 1.6mm × 0.95mm with gull-wing leads. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact footprint is pin-compatible with other SC70-4 supervisory circuits and supports reflow soldering at +260°C peak temperature.
How does the MAX6385XS37D4-T behave during severe supply voltage droop, and what is its minimum functional VCC?
The MAX6385XS37D4-T guarantees correct RESET output logic state down to VCC = 1.0V - meaning it continues asserting active-high reset even during deep brownout conditions where many competing supervisors fail. Below 1.0V, the device ceases operation, but the push-pull output remains in its last valid state until VCC drops further. This behavior ensures deterministic system halt before uncontrolled code execution occurs.
Can the MAX6385XS37D4-T monitor a second voltage rail, and does it support auxiliary reset inputs like RESET IN?
No, the MAX6385XS37D4-T does not support auxiliary voltage monitoring. It is a single-supply supervisor that monitors only the VCC pin. Devices with RESET IN capability (e.g., MAX6387/MAX6388) belong to the same family but are distinct part numbers. The MAX6385XS37D4-T pinout contains VCC, RESET, MR, and GND - no dedicated RESET IN terminal - making it suitable for applications where only primary rail supervision is required.
MAX6385XS37D4-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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.7V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS37D4-T FAQ
1.How can I place an order for MAX6385XS37D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS37D4-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 MAX6385XS37D4-T reliable?
The price and inventory of MAX6385XS37D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS37D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS37D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS37D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS37D4-T?
MAX6385XS37D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS37D4-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 MAX6385XS37D4-T?
For technical support, including MAX6385XS37D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS37D4-T requirements.
6.How does Aetrix verify that MAX6385XS37D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS37D4-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 MAX6385XS37D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS37D4-T?
All MAX6385XS37D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS37D4-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 MAX6385XS37D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS37D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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