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Analog Devices Inc./Maxim Integrated MAX6381XR26D3-T
- Part No.:
- MAX6381XR26D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR26D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,422
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Product details
Overview
MAX6381XR26D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring a factory-set 2.63V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and active-low open-drain reset output. It monitors single-supply voltages from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6381XR26D3-T datasheet, MAX6381XR26D3-T pinout, MAX6381XR26D3-T application, or MAX6381XR26D3-T equivalent, key selection criteria include its precise 2.63V threshold tolerance, 140ms reset hold time, open-drain output requiring external pullup, immunity to negative-going VCC transients, and AEC-Q100-qualified automotive variant availability.
Technical Context
The MAX6381XR26D3-T 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 monolithic RC timer generating a guaranteed-minimum 140ms reset assertion after VCC recovery. Its open-drain RESET output requires an external pullup resistor and remains valid down to VCC = 1V, enabling robust reset signaling during deep brownout conditions.
No manual reset (MR) input or auxiliary RESET IN comparator is integrated - this variant is optimized for simple single-rail monitoring without user-initiated reset or dual-voltage supervision, distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 family members.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal, ±2.5% over -40°C to +125°C - ensures accurate power-fail detection across automotive and industrial temperature ranges. |
| Reset Timeout | 140ms minimum - holds reset long enough to guarantee microprocessor initialization after supply stabilization. | 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 severe brownout down to 1V, critical for fail-safe system recovery. |
| Output Type | Active-low open-drain - requires external pullup but allows wired-OR configuration and level translation with host logic. |
| Package | 3-pin SC70 (2.0mm × 2.1mm) - ultra-compact footprint for space-constrained PCBs in wearables and compact controllers. |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and outdoor equipment. |
Pinout & Package
3-pin SC70 package (outline 21-0075, land pattern 90-0208), 2.0mm × 2.1mm body, 0.65mm pitch, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - must be pulled up externally; asserts low when VCC < 2.63V and holds for ≥140ms after VCC recovery. |
| 2 | VCC | Main supply input and monitored rail - powers internal circuitry and serves as the primary reset trigger source. |
| 3 | GND | Analog/digital ground reference - must be connected directly to system ground plane for stable threshold accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.63V with ±2.5% tolerance over full -40°C to +125°C range - eliminates need for external calibration in harsh environments. |
| Ultra-low quiescent current | 3μA at +1.8V - extends battery life in always-on monitoring applications such as smart meters and remote sensors. |
| Brownout immunity | Guaranteed valid RESET output down to VCC = 1V - ensures deterministic reset behavior during deep undervoltage events. |
| Negative transient rejection | Immune to short-duration VCC glitches below threshold - prevents spurious resets in electrically noisy systems like motor controls. |
| Small-footprint packaging | 3-pin SC70 (2.0mm × 2.1mm) - reduces board area by >50% vs. SOT-23 alternatives while maintaining thermal performance. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Monitoring 3.3V or 2.5V I/O supply rails in programmable logic controller modules exposed to wide ambient temperatures and EMI. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset and brownout protection to FPGA and microcontroller subsystems. Use Value: 2.63V threshold matches common 2.5V rail tolerances; 140ms timeout exceeds typical FPGA configuration time; open-drain output interfaces cleanly with 3.3V logic. | Use Scenario: Ensuring safe startup and fault recovery of door module microcontrollers powered from vehicle battery (9V–16V) via local LDO. IC Role / Device Role / Timing Role: Single-rail supervisor detecting LDO output collapse during cold-crank or load-dump events. Use Value: -40°C to +125°C rating meets AEC-Q100 Grade 1 requirements; 3μA current minimizes parasitic drain on standby battery. |
| Portable Medical Sensors | Smart Energy Meters |
Use Scenario: Power sequencing and reset generation for ultra-low-power MCU and analog front-end in wearable glucose monitors. IC Role / Device Role / Timing Role: Primary reset generator triggered by main coin-cell–supplied 1.8V rail. Use Value: 3μA supply current enables >5-year battery life; 2.63V threshold provides margin above 1.8V rail dropout; SC70 size fits tight wearable form factors. | Use Scenario: Monitoring backup supercapacitor voltage during AC mains failure to initiate secure shutdown and data retention in electricity meters. IC Role / Device Role / Timing Role: Brownout detector asserting reset when backup rail falls below 2.63V during capacitor discharge. Use Value: 140ms timeout allows sufficient time for EEPROM write completion before power loss; open-drain output enables shared reset bus across multiple ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 2.63V threshold, 240ms reset timeout, push-pull active-low output, same 3-pin SC70 package | Lacks open-drain flexibility; requires no external pullup but cannot be wired-OR'd | Select when simpler interface is preferred and shared reset bus is not needed. |
| TPS3808G33DBVR | 3.3V threshold (not 2.63V), 200ms timeout, open-drain active-low, SOT-23-3 package | Higher threshold unsuitable for 2.5V/1.8V rails; larger SOT-23 footprint than SC70 | Select only if 3.3V rail monitoring is required and board layout accommodates larger package. |
Compared with MAX809TRD3-T, MAX6381XR26D3-T offers open-drain flexibility for bus sharing but requires external pullup; compared with TPS3808G33DBVR, it delivers exact 2.63V threshold matching tighter 2.5V rail specs and superior 2.0mm × 2.1mm SC70 density for miniaturized designs.
Availability
MAX6381XR26D3-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensors, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6381XR26D3-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 demanding industrial, automotive, and communications applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems where reliability under voltage stress and minimal power drain are critical design constraints.
FAQ
What is the exact reset threshold voltage of the MAX6381XR26D3-T?
The MAX6381XR26D3-T has a factory-trimmed nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "26" corresponds to 2.63V (min 2.56V, max 2.69V at +25°C). The MAX6381XR26D3-T uses this fixed threshold without user adjustment.
Does the MAX6381XR26D3-T include a manual reset input (MR)?
No, the MAX6381XR26D3-T does not feature a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Only MAX6384–MAX6386 and MAX6390 variants integrate MR. The MAX6381XR26D3-T is designed exclusively for automatic VCC monitoring with no provision for external reset initiation.
What is the function of the RESET pin on the MAX6381XR26D3-T?
The RESET pin on the MAX6381XR26D3-T is an active-low open-drain output. It pulls low when VCC drops below 2.63V and remains low for at least 140ms after VCC rises above the threshold. Because it is open-drain, an external pullup resistor is mandatory to establish a defined high state when deasserted. This configuration enables wired-OR reset buses and voltage-level translation.
Can the MAX6381XR26D3-T operate reliably at VCC = 1.2V?
Yes, the MAX6381XR26D3-T guarantees correct reset output logic state down to VCC = 1.0V, per the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.2V, the device fully functions: it monitors VCC against the 2.63V threshold (asserting reset when VCC < 2.63V), maintains timing accuracy, and drives the open-drain RESET pin with specified VOL. This makes the MAX6381XR26D3-T suitable for deep brownout recovery scenarios.
Is the MAX6381XR26D3-T qualified for automotive applications?
The base MAX6381XR26D3-T is not automotive-qualified; however, the variant MAX6381XR26D3/V+T (with "/V" suffix) is AEC-Q100 qualified for automotive use. The "/V" denotes qualification to Grade 1 (-40°C to +125°C) and includes additional reliability testing. For automotive designs, specify MAX6381XR26D3/V+T - the MAX6381XR26D3-T alone is intended for industrial and commercial applications.
MAX6381XR26D3-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR26D3-T FAQ
1.How can I place an order for MAX6381XR26D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR26D3-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 MAX6381XR26D3-T reliable?
The price and inventory of MAX6381XR26D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR26D3-T is usually 5 days.
3.What payment methods are accepted for MAX6381XR26D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR26D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR26D3-T?
MAX6381XR26D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR26D3-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 MAX6381XR26D3-T?
For technical support, including MAX6381XR26D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR26D3-T requirements.
6.How does Aetrix verify that MAX6381XR26D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR26D3-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 MAX6381XR26D3-T meets industry standards.
7.What is the process for return or replacement of MAX6381XR26D3-T?
All MAX6381XR26D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR26D3-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 MAX6381XR26D3-T part is unused and in its original packaging.
Return procedure for MAX6381XR26D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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