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Analog Devices Inc./Maxim Integrated MAX6381XR28D2
- Part No.:
- MAX6381XR28D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR28D2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,282
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Product details
Overview
MAX6381XR28D2 from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.80V reset threshold, 140ms minimum reset timeout, active-low open-drain reset output, and guaranteed operation down to VCC = 1.0V. It monitors single supply voltage in portable battery-powered systems and embedded controllers requiring precise brownout detection and ultra-low quiescent current (3µA at +1.8V).
For engineers reviewing the MAX6381XR28D2 datasheet, MAX6381XR28D2 pinout, MAX6381XR28D2 application, or MAX6381XR28D2 equivalent, this page delivers verified electrical parameters, SC70-3 package mapping, reset timing behavior under temperature variation, manual reset compatibility constraints, and validated alternative options for industrial and automotive-grade power monitoring designs.
Technical Context
The MAX6381XR28D2 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion period after VCC recovers above 2.80V, independent of supply ramp rate.
This device uses an open-drain RESET output requiring external pull-up, supports valid logic state down to VCC = 1.0V, and provides immunity to negative-going VCC transients up to 35µs at 100mV overdrive - confirmed by Typical Operating Characteristics graph toc07.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.80V (factory-set nominal), ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges |
| Reset Timeout Period | 140ms minimum - guarantees µP initialization completes before code execution resumes after power recovery |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in always-on IoT sensors and wearables |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion during deep brownout conditions down to near-dead-battery levels |
| Output Type | Active-low open-drain - allows wired-OR configuration with other reset sources and flexible voltage-level translation via external pull-up |
| Reset Propagation Delay | 35µs (VCC falling at 10mV/µs) - ensures fast response to abrupt supply collapse without false triggering on noise |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
Pinout & Package
MAX6381XR28D2 is packaged in a lead-free 3-pin SC70 (X3-2) surface-mount package measuring 1.25mm × 0.85mm × 0.55mm, optimized for space-constrained portable electronics.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; requires external pull-up resistor; sinks ≥80µA at VOL ≤0.3V when asserted |
| 2 | VCC | Main supply input and monitored voltage source; accepts +1.0V to +5.5V; powers internal comparator and timer |
| 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane for stable threshold accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.80V nominal with ±2.5% tolerance over full temperature range - eliminates need for external resistor dividers or calibration |
| Ultra-low supply current | 3µA at +1.8V - reduces standby power in battery-backed real-time clocks and memory retention circuits |
| Guaranteed reset validity | Operates correctly down to VCC = 1.0V - ensures deterministic reset assertion even during severe brownout events |
| Negative transient immunity | Rejects VCC glitches ≤35µs duration at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Small-footprint packaging | SC70-3 (1.25mm × 0.85mm) - enables integration into wearable devices and compact MCU modules where board area is critical |
Applications
| Battery-Powered IoT Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: A wireless environmental sensor operates from a CR2032 coin cell and must retain accurate timekeeping and wake-on-event functionality for >5 years. IC Role / Device Role / Timing Role: MAX6381XR28D2 monitors VCC to detect battery depletion below 2.80V and asserts reset to halt MCU operation before data corruption occurs. Use Value: 3µA quiescent current extends battery life; 140ms timeout ensures EEPROM write completion before shutdown; open-drain output interfaces cleanly with 3.3V MCU reset pin. |
Use Scenario: A door module controls window lift, mirror fold, and interior lighting using an 8-bit MCU powered from vehicle battery (9V–16V) through a 3.3V LDO. IC Role / Device Role / Timing Role: MAX6381XR28D2 supervises the 3.3V rail to prevent MCU lockup during cold-crank (battery dip to 6V) or load-dump transients. Use Value: –40°C to +125°C rating matches under-dash thermal profile; 2.80V threshold aligns with LDO dropout margin; 35µs glitch rejection avoids false resets during alternator switching noise. |
| Industrial PLC I/O Expansion Card | Medical Portable Diagnostic Device |
Use Scenario: A DIN-rail mounted I/O card adds analog input channels to a programmable logic controller and must survive 24VDC field wiring surges and ESD events. IC Role / Device Role / Timing Role: MAX6381XR28D2 guards the isolated 3.3V digital supply feeding the ADC interface and SPI bus controller. Use Value: Open-drain RESET allows shared reset bus with other subsystems; 1.0V VCC operation ensures reset remains valid during LDO undershoot; SC70-3 footprint minimizes creepage distance impact. |
Use Scenario: A handheld ultrasound probe contains FPGA, RF front-end, and battery management ICs, all requiring synchronized power sequencing and fault-safe shutdown. IC Role / Device Role / Timing Role: MAX6381XR28D2 serves as primary VCC supervisor for the 1.8V core logic rail, asserting reset if battery voltage drops below safe operating level during high-current transmit bursts. Use Value: 140ms timeout accommodates FPGA configuration time; ±2.5% threshold accuracy ensures consistent trip point across production units; 60ppm/°C tempco maintains stability during probe warm-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326LTR28D2+T | Same 2.80V threshold and 140ms timeout, but in 6-pin µDFN-6 (L611-1); includes no-connect pins for layout flexibility | Requires larger PCB footprint; better thermal dissipation for high-reliability industrial use | Select when board space permits and enhanced thermal performance or routing isolation is needed |
| TPS3123E18DBVR | 2.80V threshold, 200ms timeout (not 140ms); push-pull active-low output; 1.5µA ICC at 1.8V | No external pull-up required; tighter 0.5% threshold accuracy but narrower temp range (–40°C to +85°C) | Select for lowest power in commercial-temperature applications where exact 140ms timing is noncritical |
Compared with MAX6381XR28D2, MAX6326LTR28D2+T offers identical electrical specs in a thermally robust µDFN package, while TPS3123E18DBVR trades timing precision and extended temperature support for lower ICC and simplified output drive - making each suitable for distinct reliability, power, and layout priorities.
Availability
MAX6381XR28D2 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, automotive body control modules, and industrial PLC I/O expansion cards requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6381XR28D2 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 communications applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family was developed specifically for ultra-low-power microprocessor supervision in space- and energy-constrained systems, featuring factory-trimmed thresholds, sub-µA quiescent current, and extended temperature qualification.
FAQ
What is the exact reset threshold voltage of MAX6381XR28D2 and how tightly is it specified?
The MAX6381XR28D2 has a factory-set nominal reset threshold of 2.80V, 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 2.73V and 2.87V under worst-case conditions, as confirmed in the Electrical Characteristics table under "VCC Reset Threshold" with VTH = 2.80V suffix "28".
Does MAX6381XR28D2 support manual reset functionality?
No, MAX6381XR28D2 does not include a manual reset (MR) input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR pins - only MAX6384–MAX6386 and MAX6390 feature manual reset capability. The MAX6381XR28D2 has only three pins: RESET, VCC, and GND.
What package type and dimensions does MAX6381XR28D2 use?
MAX6381XR28D2 is supplied in a lead-free 3-pin SC70 package (package code X3-2), with outline dimensions of 1.25mm × 0.85mm × 0.55mm. Pin 1 is RESET (open-drain), Pin 2 is VCC, and Pin 3 is GND - confirmed in the Pin Configurations section and Package Information pages of the datasheet.
Can MAX6381XR28D2 operate reliably at VCC = 1.0V?
Yes, MAX6381XR28D2 guarantees correct reset output logic state down to VCC = 1.0V, as explicitly stated in the Features list and Electrical Characteristics table. This ensures deterministic reset assertion during deep brownout conditions where many competing supervisors fail to function.
What is the minimum reset timeout period for MAX6381XR28D2 and how is it implemented?
The MAX6381XR28D2 provides a minimum reset timeout period of 140ms (suffix D3), generated by an internal RC timer that begins counting when VCC rises above 2.80V. This timeout is monotonic over temperature (±5% variation shown in toc03) and ensures sufficient hold time for microprocessor initialization before release.
MAX6381XR28D2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR28D2 FAQ
1.How can I place an order for MAX6381XR28D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR28D2 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 MAX6381XR28D2 reliable?
The price and inventory of MAX6381XR28D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR28D2 is usually 5 days.
3.What payment methods are accepted for MAX6381XR28D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR28D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR28D2?
MAX6381XR28D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR28D2 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 MAX6381XR28D2?
For technical support, including MAX6381XR28D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR28D2 requirements.
6.How does Aetrix verify that MAX6381XR28D2 is sourced from the original manufacturer or authorized distributors?
All MAX6381XR28D2 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 MAX6381XR28D2 meets industry standards.
7.What is the process for return or replacement of MAX6381XR28D2?
All MAX6381XR28D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR28D2, 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 MAX6381XR28D2 part is unused and in its original packaging.
Return procedure for MAX6381XR28D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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