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Analog Devices Inc./Maxim Integrated MAX6385XS42D5-T
- Part No.:
- MAX6385XS42D5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS42D5-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,889
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Product details
Overview
MAX6385XS42D5-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.20V reset threshold, 280ms minimum VCC reset timeout, and manual reset input. It monitors single supply voltage (1.0V–5.5V), consumes only 3μA at 1.8V, and guarantees valid reset output down to VCC = 1V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6385XS42D5-T datasheet, MAX6385XS42D5-T pinout, MAX6385XS42D5-T application, or MAX6385XS42D5-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), MR input pullup resistance (63kΩ), open-drain vs. push-pull output compatibility, and SC70-4 package footprint constraints.
Technical Context
The MAX6385XS42D5-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer enforces a guaranteed minimum 280ms reset assertion after VCC rises above 4.20V.
It features a debounced active-low manual reset input (MR) with 63kΩ internal pullup, supporting TTL/CMOS logic drive and requiring no external debounce circuitry. Reset output remains high during MR assertion and for the full 280ms timeout after MR release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.20V (nominal), ±2.5% tolerance over –40°C to +125°C - ensures consistent brownout detection across automotive and industrial temperature ranges |
| VCC Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors without compromising reset reliability |
| Reset Timeout Period | 280ms (minimum) - provides sufficient hold time for slow-ramping microcontrollers and FPGA configuration circuits |
| Output Type | Push-pull active-high - eliminates need for external pullup resistor and supports direct interface to CMOS reset inputs |
| Manual Reset Input | Active-low MR with 63kΩ internal pullup - allows momentary switch connection to GND without external components |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion down to ultralow VCC levels, critical for deep-sleep wake-up integrity |
| Reset Output Validity | Guaranteed down to VCC = 1V - ensures deterministic reset state during partial power collapse or battery sag |
Pinout & Package
MAX6385XS42D5-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, suitable for space-constrained portable designs.
| Pin/Terminal | 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 normal operation, pulls low only during reset assertion - directly compatible with μP / RESET pins requiring active-high logic |
| 3 | GND | Analog and digital ground reference; must be connected to system ground plane with low-impedance path to ensure noise immunity |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC (63kΩ); asserting low forces immediate reset and initiates 280ms timeout on release |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.20V with ±2.5% accuracy over –40°C to +125°C - eliminates need for external resistor divider calibration in production |
| Low quiescent current | 3μA at 1.8V - extends battery life in always-on monitoring applications such as smart meters and wearables |
| Guaranteed reset validity | Operates correctly down to VCC = 1V - prevents spurious resets during ultra-low-voltage wake-up sequences |
| Integrated MR pullup | 63kΩ internal resistor - reduces BOM count and PCB area by eliminating discrete pullup component |
| Negative-going transient immunity | Immune to VCC glitches <100ns at 100mV overdrive - suppresses false resets caused by switching noise or ESD coupling |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises VCC rail during cold-start and battery sag; asserts active-high RESET to initialize MCU after power recovery. Use Value: 280ms timeout ensures stable core voltage before firmware execution; 3μA ICC minimizes standby drain, extending operational life beyond 18 months. |
Use Scenario: LoRaWAN environmental sensor node powered by Li-SOCl₂ primary cell in remote field deployment. IC Role / Device Role / Timing Role: Monitors main supply and triggers controlled restart upon brownout; MR pin enables field technician-initiated reconfiguration via tactile switch. Use Value: 4.20V threshold aligns with nominal 3.6V Li-SOCl₂ cutoff; 63kΩ MR pullup eliminates external resistor, reducing failure modes in harsh environments. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
|
Use Scenario: DIN-rail mounted programmable logic controller with dual 24V/5V rails and isolated communication interfaces. IC Role / Device Role / Timing Role: Provides primary reset supervision for 5V logic domain; coordinates power sequencing with isolated DC-DC converters. Use Value: ±2.5% threshold accuracy over –40°C to +125°C ensures deterministic behavior across ambient extremes; SC70-4 footprint simplifies layout in dense control board designs. |
Use Scenario: Door module with LIN bus interface, LED drivers, and window motor control, operating in under-hood temperature conditions. IC Role / Device Role / Timing Role: Resets microcontroller during ignition cycling and load-dump transients; MR pin supports diagnostic mode entry via service tool. Use Value: Negative-going transient immunity prevents false resets during alternator ripple; AEC-Q100 qualified variant available (MAX6385XS42D5/V+T) for automotive-grade reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385LT42D5-T | Same electrical specs but in 6-pin μDFN (1.5mm × 2.0mm) instead of 4-pin SC70 - larger footprint, better thermal dissipation | Preferred where board space permits and higher thermal margin is required in high-ambient industrial enclosures | Select when thermal performance > footprint density; not pin-compatible due to different pin count and layout |
| TPS3808G33DBVR | 3.3V fixed threshold (not 4.20V); 200ms timeout (not 280ms); 1.6μA ICC at 1.8V - lower current but mismatched threshold and timing | Suitable only if system operates at 3.3V nominal and can tolerate tighter reset window; requires redesign of reset timing margins | Choose only if threshold and timeout values align with system requirements; verify MR compatibility and output polarity match |
Compared with MAX6385XS42D5-T, the MAX6385LT42D5-T offers identical functionality in a thermally superior μDFN package but demands PCB layout revision, while the TPS3808G33DBVR provides lower ICC but lacks the precise 4.20V threshold and 280ms timeout needed for legacy 5V-tolerant microcontroller interfaces.
Availability
MAX6385XS42D5-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply with long-term lifecycle support.
Supply support for MAX6385XS42D5-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 operation and high reliability.
The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for battery longevity, wide-temperature robustness, and minimal board space - targeting portable, automotive, and industrial edge devices.
FAQ
What is the exact reset threshold voltage of MAX6385XS42D5-T and how tightly is it specified?
The MAX6385XS42D5-T has a factory-set nominal reset threshold of 4.20V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This means the actual threshold falls between 4.10V and 4.31V at +25°C, and between 4.00V and 4.31V across temperature extremes - ensuring predictable brownout response in automotive and industrial environments where MAX6385XS42D5-T is commonly deployed.
Does MAX6385XS42D5-T support manual reset functionality, and what is the internal pullup value?
Yes, MAX6385XS42D5-T includes an active-low manual reset input (MR) with a confirmed internal pullup resistor of 63kΩ to VCC. This allows direct connection of a normally open momentary switch between MR and GND without external components. The MR pin accepts TTL/CMOS logic levels and maintains reset assertion for the full 280ms timeout period after release, making MAX6385XS42D5-T suitable for field-serviceable embedded systems requiring operator-initiated restarts.
What package type and dimensions does MAX6385XS42D5-T use, and is it RoHS-compliant?
MAX6385XS42D5-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact footprint enables high-density placement in space-constrained applications like wearable electronics and miniaturized industrial sensors where MAX6385XS42D5-T is frequently selected for its size-efficiency tradeoff.
How does MAX6385XS42D5-T behave when supply voltage drops below 1.0V?
MAX6385XS42D5-T guarantees correct reset output logic state only down to VCC = 1.0V - below this level, the internal circuitry cannot maintain defined behavior. For applications requiring valid reset signaling all the way to 0V (e.g., ultra-low-power wake-up circuits), an external pulldown resistor is recommended on the active-high RESET output. This design consideration is explicitly documented in the MAX6385XS42D5-T datasheet and applies uniquely to its push-pull architecture, unlike open-drain variants.
Is MAX6385XS42D5-T pin-compatible with older Maxim reset ICs like MAX809 or MAX6326?
No, MAX6385XS42D5-T is not pin-compatible with MAX809 or MAX6326. While the datasheet states functional pin compatibility *within the MAX6381–MAX6390 family* for same-package variants (e.g., MAX6385XSxxDx-T in SC70-4), MAX809 uses SOT23-3 and MAX6326 uses SOT23-5 - differing in pin count, assignment, and physical outline. Replacing those parts with MAX6385XS42D5-T requires PCB layout modification and verification of reset polarity, timing, and voltage thresholds to ensure system-level compatibility.
MAX6385XS42D5-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:
- 4.2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 280ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS42D5-T FAQ
1.How can I place an order for MAX6385XS42D5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS42D5-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 MAX6385XS42D5-T reliable?
The price and inventory of MAX6385XS42D5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS42D5-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS42D5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS42D5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS42D5-T?
MAX6385XS42D5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS42D5-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 MAX6385XS42D5-T?
For technical support, including MAX6385XS42D5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS42D5-T requirements.
6.How does Aetrix verify that MAX6385XS42D5-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS42D5-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 MAX6385XS42D5-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS42D5-T?
All MAX6385XS42D5-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS42D5-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 MAX6385XS42D5-T part is unused and in its original packaging.
Return procedure for MAX6385XS42D5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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