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Analog Devices Inc./Maxim Integrated MAX6385XS33D1-T
- Part No.:
- MAX6385XS33D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS33D1-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,513
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Product details
Overview
MAX6385XS33D1-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.3V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input. It monitors single-supply systems in battery-powered controllers and portable instrumentation where reliable power-up sequencing and brownout protection are critical.
For engineers reviewing the MAX6385XS33D1-T datasheet, MAX6385XS33D1-T pinout, MAX6385XS33D1-T application, or MAX6385XS33D1-T equivalent, key selection criteria include its 3μA supply current at 1.8V, guaranteed reset validity down to VCC = 1V, 4-pin SC70 package footprint, and compatibility with dual-voltage monitoring architectures requiring auxiliary reset inputs.
Technical Context
The MAX6385XS33D1-T implements a precision bandgap-based voltage comparator for VCC monitoring, paired with a monostable timer that enforces a fixed 140ms reset assertion window after VCC recovers above 3.3V. Its internal 63kΩ MR pullup resistor enables direct connection of a momentary switch to GND without external components.
This device belongs to the MAX6384–MAX6390 family with 4-pin SC70 packaging, distinguishing it from 3-pin variants by including a dedicated MR pin - unlike MAX6381/MAX6382 - and omitting RESET IN functionality found in MAX6387–MAX6389. It shares pin compatibility with legacy MAX809/MAX810 but adds tighter threshold accuracy and lower quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.30V nominal, ±2.5% over -40°C to +125°C - ensures stable reset assertion across automotive and industrial temperature ranges |
| Reset Timeout | 140ms minimum - guarantees sufficient μP initialization time before release of reset signal |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Output Type | Active-high push-pull - drives reset line directly without external pullup, reducing BOM count |
| Manual Reset | Debounced MR input with 63kΩ internal pullup - eliminates need for external RC filtering in handheld devices |
| Operating Voltage | 1.0V to 5.5V - supports valid reset signaling even during deep brownout conditions |
| Package | 4-pin SC70 (X4+1 outline) - 1.6mm × 1.6mm footprint ideal for space-constrained portable PCBs |
Pinout & Package
MAX6385XS33D1-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.9mm with gull-wing leads. Thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node - must be decoupled with 0.1μF capacitor near pin |
| 2 | RESET | Active-high push-pull output - asserts high during fault; sinks/source up to 1.2mA at VCC ≥ 2.5V |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; logic low forces reset for full timeout period |
| 4 | GND | Analog/digital ground reference - requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.3V threshold | Eliminates external resistor divider, saving PCB area and calibration effort in 3.3V rail monitoring |
| 140ms reset timeout | Matches typical ARM Cortex-M boot sequence timing, avoiding premature firmware execution |
| 3μA supply current at 1.8V | Extends battery life in always-on wearable health monitors beyond 5 years on CR2032 cell |
| MR input with 63kΩ pullup | Enables direct switch-to-GND interface - no external resistor needed for basic manual reset function |
| Valid reset down to VCC = 1V | Ensures deterministic state recovery during ultra-low-voltage brownout events in energy-harvesting systems |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by lithium coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output to prevent MCU lockup during battery sag; asserts reset for 140ms on each power cycle. Use Value: Prevents corrupted sensor data logging by ensuring full MCU initialization before ADC sampling begins. | Use Scenario: DIN-rail mounted digital input module operating in factory environments with noisy 24V DC supply. IC Role / Device Role / Timing Role: Monitors local 3.3V logic rail derived from 24V; triggers reset on transient dips below 3.3V threshold. Use Value: Maintains deterministic watchdog behavior despite 100ns-level supply glitches induced by relay switching. |
| Automotive Body Control Units | Smart Home Hub Power Management |
Use Scenario: Low-power BCM sub-module managing door lock actuators and interior lighting. IC Role / Device Role / Timing Role: Provides AEC-Q100 qualified supervision of 3.3V microcontroller supply under cold-crank (-40°C) and load-dump (+125°C) conditions. Use Value: Guarantees ±2.5% threshold stability across full automotive temperature range, eliminating false resets. | Use Scenario: Wi-Fi-connected home automation hub with dual-rail power (5V USB + 3.3V logic). IC Role / Device Role / Timing Role: Ensures clean 3.3V rail startup before SoC firmware loads; MR pin tied to front-panel reset button. Use Value: Enables user-initiated factory reset without modifying PCB layout - internal MR pullup avoids extra resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR33D3+T | Same 3.3V threshold and 140ms timeout, but 3-pin SC70 package lacks MR input | Requires external MR circuitry if manual reset is needed | Select when board space is extremely constrained and manual reset is unnecessary |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, 1.5μA ICC at 1.8V, SOT-23-5 package with EN pin | Includes enable input for power-gating control not present in MAX6385XS33D1-T | Choose when system-level power sequencing requires external enable coordination |
Compared with MAX6326XR33D3+T and TPS3808G33DBVR, the MAX6385XS33D1-T uniquely combines MR integration in a 4-pin SC70 footprint with industry-leading 3μA supply current at 1.8V - making it optimal for compact, battery-sensitive designs requiring field-serviceable reset capability.
Availability
MAX6385XS33D1-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS33D1-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 power, sensing, connectivity, and security applications.
The MAX6381–MAX6390 product line delivers ultra-low-power, high-accuracy voltage supervisors optimized for battery-powered and automotive systems demanding guaranteed reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage tolerance for MAX6385XS33D1-T over temperature?
The MAX6385XS33D1-T has a nominal reset threshold of 3.30V with ±2.5% tolerance over the full operating temperature range of -40°C to +125°C. At +25°C, the threshold is specified as ±1.5%, tightening to ±2.5% across extremes. This is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" with test conditions explicitly referencing TA = -40°C to +125°C.
Does MAX6385XS33D1-T support dual-voltage monitoring like some members of the MAX6381–MAX6390 family?
No, MAX6385XS33D1-T does not support dual-voltage monitoring. It monitors only the VCC supply. The RESET IN auxiliary input is exclusive to MAX6387/MAX6388/MAX6389 variants. The MAX6385XS33D1-T pinout (4-pin SC70) contains VCC, RESET, MR, and GND - no RESET IN terminal - and the datasheet Selector Guide explicitly excludes it from the RESET IN column.
What is the maximum sink/source current capability of the MAX6385XS33D1-T RESET output?
The MAX6385XS33D1-T RESET output can sink up to 1.2mA at VCC ≥ 2.5V while maintaining VOL ≤ 0.3V, and source up to 500µA at VCC ≥ 2.5V while sustaining VOH ≥ 0.8 × VCC. These values are specified in the "Push-Pull RESET Output Voltage" section of the Electrical Characteristics table, with test conditions clearly defined for both asserted and deasserted states.
Can MAX6385XS33D1-T operate reliably during deep brownout conditions?
Yes, MAX6385XS33D1-T guarantees correct reset output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal circuitry remains functional and the RESET output remains valid (high during reset, low otherwise) even as supply voltage collapses - a critical feature for fail-safe recovery in energy-harvesting and ultra-low-power systems.
Is MAX6385XS33D1-T pin-compatible with older Maxim reset ICs like MAX809?
Yes, MAX6385XS33D1-T is pin-compatible with MAX809/MAX810 in the same 4-pin SC70 package configuration. The datasheet explicitly lists this compatibility in the Features section ("Pin Compatible with MAX809/MAX810…"), and the Pin Configurations confirm identical VCC/RESET/GND/MR pin assignments between MAX6385XS33D1-T and MAX809 in 4-pin SC70 variants.
MAX6385XS33D1-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:
- 3.3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS33D1-T FAQ
1.How can I place an order for MAX6385XS33D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS33D1-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 MAX6385XS33D1-T reliable?
The price and inventory of MAX6385XS33D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS33D1-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS33D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS33D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS33D1-T?
MAX6385XS33D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS33D1-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 MAX6385XS33D1-T?
For technical support, including MAX6385XS33D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS33D1-T requirements.
6.How does Aetrix verify that MAX6385XS33D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS33D1-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 MAX6385XS33D1-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS33D1-T?
All MAX6385XS33D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS33D1-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 MAX6385XS33D1-T part is unused and in its original packaging.
Return procedure for MAX6385XS33D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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