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Analog Devices Inc./Maxim Integrated MAX6381XR28D2+T
- Part No.:
- MAX6381XR28D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR28D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,782
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Product details
Overview
The MAX6381XR28D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set 2.80V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and active-low push-pull reset output. It monitors VCC from +1.8V to +5.0V while drawing only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered microcontroller power-up sequencing in portable instrumentation.
For engineers reviewing the MAX6381XR28D2+T datasheet, MAX6381XR28D2+T pinout, MAX6381XR28D2+T application, or MAX6381XR28D2+T equivalent, key selection considerations include its precise 2.80V threshold tolerance, ultra-low quiescent current, guaranteed operation at 1V supply, immunity to negative-going VCC transients, and compatibility with legacy MAX809/MAX810 designs.
Technical Context
This device implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco, paired with a temperature-stable monostable timer for deterministic 20ms reset assertion after VCC recovery. The push-pull output drives high-impedance loads without external pullup, and internal logic ensures reset remains asserted during brownout, power-up, and fast VCC glitches.
No manual reset (MR) or auxiliary RESET IN inputs are present - the MAX6381XR28D2+T is a dedicated single-supply monitor with fixed timing and threshold, distinguishing it from MR-enabled variants like MAX6384 or dual-input variants like MAX6387. Its 3-pin SC70 footprint minimizes board space while maintaining full electrical performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.80V nominal, ±2.5% over -40°C to +125°C - ensures reliable detection of 2.8V rail collapse without false triggers. |
| Reset Timeout | 20ms minimum - provides sufficient hold time for microcontroller core initialization after power stabilization. |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables. |
| VCC Operating Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout down to 1V supply. |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and drives standard CMOS/TTL reset inputs directly. |
| Reset Propagation Delay | 35μs max (VCC falling at 10mV/µs) - responds rapidly to supply faults without missing critical voltage excursions. |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
Package: 3-pin SC70 (Outline Number 21-0075, Land Pattern 90-0208), footprint-compatible with industry-standard low-pin-count supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low when VCC < 2.80V; deasserts high after 20ms timeout - directly interfaces with μP /RESET pin. |
| 2 | VCC | Main supply input and monitored voltage rail; accepts +1.0V to +5.5V; powers internal comparator and timer. |
| 3 | GND | Analog/digital ground reference; must be connected to system ground plane for accurate threshold sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.80V with ±2.5% tolerance over full industrial temperature range - eliminates need for external calibration or trimming. |
| Ultra-low supply current | 3μA at 1.8V - extends battery life in always-on monitoring applications without sacrificing reset reliability. |
| Brownout immunity | Guaranteed valid reset output down to VCC = 1V - prevents spurious release during severe undervoltage conditions. |
| Negative transient rejection | Immune to short-duration VCC glitches below threshold - avoids false resets in electrically noisy environments. |
| Small-footprint packaging | 3-pin SC70 (1.25mm × 0.85mm) - saves PCB area in space-constrained portable and medical devices. |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with 2.8V LDO output. IC Role / Device Role / Timing Role: Monitors LDO output and asserts reset to MSP430 microcontroller during battery depletion or cold-start undervoltage. Use Value: 3μA quiescent current enables >5-year shelf life; 2.80V threshold matches LDO nominal output; 20ms timeout ensures stable clock lock before firmware execution. | Use Scenario: Door module MCU powered from vehicle's 2.8V I/O rail subject to load-dump transients. IC Role / Device Role / Timing Role: Supervises 2.8V rail and holds MCU in reset during ignition cycling and alternator ripple events. Use Value: ±2.5% threshold accuracy prevents false resets across -40°C to +125°C cabin temperatures; negative transient immunity rejects 100ns–1µs glitches. |
| Industrial PLC I/O Subsystems | Smart Energy Meters |
Use Scenario: Isolated analog input card with 2.8V ADC reference and ARM Cortex-M0 host. IC Role / Device Role / Timing Role: Ensures clean power-up sequence by holding MCU and ADC in reset until 2.8V rail stabilizes post-isolation DC/DC startup. Use Value: Push-pull output drives long traces without signal degradation; 20ms timeout accommodates slow-ramping isolated supplies. | Use Scenario: Metering SoC powered from 2.8V buck converter fed by mains rectifier, operating in high-EMI utility cabinets. IC Role / Device Role / Timing Role: Detects 2.8V rail collapse during brownouts and initiates controlled shutdown via secure boot loader reset. Use Value: Valid reset assertion down to 1V allows safe state capture during deep undervoltage; RoHS-compliant SC70 package meets global compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | Same 2.80V threshold and 20ms timeout, but rated only to +85°C; 3μA ICC at 1.8V identical. | Lacks AEC-Q100 qualification and extended -40°C to +125°C operation - unsuitable for automotive or harsh industrial use. | Select MAX809TRD2+T only for commercial-temperature consumer applications where cost is prioritized over temperature range. |
| TPS3808G28DBVR | 2.80V threshold with ±0.5% initial accuracy (tighter than MAX6381), but 8μA ICC at 1.8V - 2.7× higher quiescent current. | Includes enable pin and adjustable delay; no SC70 option - offered only in SOT-23-5, increasing board area. | Choose TPS3808G28DBVR when higher threshold accuracy is critical and extra pin count/layout space is acceptable. |
Compared with MAX809TRD2+T and TPS3808G28DBVR, the MAX6381XR28D2+T uniquely balances automotive-grade temperature range, ultra-low 3μA supply current, compact 3-pin SC70 footprint, and production-proven reliability - making it optimal for space- and power-constrained embedded systems requiring robust reset supervision.
Availability
MAX6381XR28D2+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O subsystems, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6381XR28D2+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, with emphasis on power efficiency, reliability, and integration.
The MAX6381–MAX6390 family delivers single- and dual-supply microprocessor supervisory circuits optimized for low-voltage, low-power embedded systems - specifically engineered to replace discrete reset solutions in battery-powered and thermally challenging environments.
FAQ
What is the exact reset threshold voltage of the MAX6381XR28D2+T and how tightly is it specified?
The MAX6381XR28D2+T 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 at any temperature within that range, ensuring consistent brownout detection without calibration. The MAX6381XR28D2+T achieves this using a precision bandgap reference and laser-trimmed resistive divider.
Does the MAX6381XR28D2+T support manual reset functionality?
No, the MAX6381XR28D2+T does not include a manual reset (MR) input. It is a dedicated single-supply supervisory circuit with fixed 2.80V threshold and 20ms timeout. Manual reset capability is provided only in other members of the family such as MAX6384, MAX6385, MAX6386, and MAX6390. The MAX6381XR28D2+T uses a 3-pin SC70 package with pins assigned strictly to RESET, VCC, and GND.
What is the minimum supply voltage at which the MAX6381XR28D2+T guarantees correct reset output behavior?
The MAX6381XR28D2+T guarantees valid reset output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not operate reliably, but above 1.0V - including during brownout recovery - the device ensures the RESET pin correctly reflects the VCC condition relative to the 2.80V threshold. This specification is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the MAX6381XR28D2+T datasheet.
Can the MAX6381XR28D2+T be used in automotive applications?
Yes, the MAX6381XR28D2+T is AEC-Q100 qualified for automotive use, as indicated by the "/V" suffix option in the family ordering guide and confirmed in the Features section. While the specific MAX6381XR28D2+T variant shown here carries the RoHS-compliant "+T" suffix, its underlying die and process meet AEC-Q100 Grade 1 (-40°C to +125°C) requirements. For certified automotive builds, the /V version (e.g., MAX6381XR28D2/V+T) should be specified.
How does the MAX6381XR28D2+T handle fast negative-going transients on the VCC line?
The MAX6381XR28D2+T incorporates built-in immunity to short-duration negative-going VCC transients (glitches), as documented in the "Negative-Going VCC Transients" section. Its reset comparator requires both sufficient magnitude (overdrive below threshold) and duration to assert reset; typical maximum glitch widths that avoid false triggering range from ~100ns at 100mV overdrive to ~1µs at 20mV overdrive. Adding a 0.1µF ceramic capacitor close to the VCC pin further enhances transient rejection for the MAX6381XR28D2+T.
MAX6381XR28D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6381XR28D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR28D2+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 MAX6381XR28D2+T reliable?
The price and inventory of MAX6381XR28D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR28D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR28D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR28D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR28D2+T?
MAX6381XR28D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR28D2+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 MAX6381XR28D2+T?
For technical support, including MAX6381XR28D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR28D2+T requirements.
6.How does Aetrix verify that MAX6381XR28D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR28D2+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 MAX6381XR28D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR28D2+T?
All MAX6381XR28D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR28D2+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 MAX6381XR28D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR28D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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