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Analog Devices Inc./Maxim Integrated MAX6381XR46D2
- Part No.:
- MAX6381XR46D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR46D2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,262
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Product details
Overview
MAX6381XR46D2 from Maxim Integrated is a single-supply, low-power microprocessor supervisory circuit with factory-set 4.63V reset threshold, 20ms minimum reset timeout, and active-low open-drain reset output. It monitors VCC from +1.8V to +5.0V, consumes only 3µA at +1.8V, and guarantees valid reset state down to VCC = 1V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6381XR46D2 datasheet, MAX6381XR46D2 pinout, MAX6381XR46D2 application, or MAX6381XR46D2 equivalent, this page delivers verified electrical parameters, SC70-3 package mapping, reset timing behavior under temperature variation, manual reset compatibility (not applicable), and direct alternatives for voltage-monitoring reset IC selection in space-constrained embedded systems.
Technical Context
The MAX6381XR46D2 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 20ms minimum reset assertion period after VCC recovers above 4.63V.
No manual reset input or auxiliary RESET IN pin is present - it is a dedicated single-voltage monitor. The open-drain RESET output requires an external pullup and sinks ≥80µA while asserted, with VOL ≤0.3V at VCC ≥1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (±2.5% over –40°C to +125°C); triggers reset when VCC falls below this level |
| Reset Timeout Period | 20ms minimum; ensures µP remains held in reset long enough for stable power rail recovery |
| Supply Current | 3µA at +1.8V; enables ultra-low-power operation in battery-critical applications |
| Operating Voltage Range | +1.0V to +5.5V; supports valid reset assertion down to 1V VCC, critical for deep brownout detection |
| Output Type | Active-low open-drain; requires external pullup resistor; compatible with mixed-voltage logic interfaces |
| Reset Output Sink Capability | 80µA at VOL ≤0.3V (VCC ≥1.0V); sufficient to drive standard CMOS inputs without buffering |
| Temperature Range | –40°C to +125°C; qualified for automotive and industrial environments |
Pinout & Package
MAX6381XR46D2 is housed in a 3-pin SC70-3 package (package code X3-2), measuring 2.0mm × 2.1mm × 0.95mm, with wettable flanks and lead-free finish. Pin 1 = RESET (active-low open-drain), Pin 2 = VCC, Pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output; must be pulled up externally; asserts low during reset condition |
| 2 | VCC | Main supply input and monitored voltage rail; powers internal circuitry and sets fixed reset threshold |
| 3 | GND | Analog and digital ground reference; required for accurate comparator operation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.63V with ±2.5% tolerance across full temperature range - eliminates external resistor network |
| Ultra-low quiescent current | 3µA at 1.8V - extends battery life in always-on monitoring applications |
| Guaranteed reset validity | Operates correctly down to VCC = 1V - ensures robust reset assertion during severe brownouts |
| Negative-going transient immunity | Rejects short VCC glitches (e.g., <35µs at 100mV overdrive) - prevents spurious resets in noisy environments |
| Small-footprint packaging | SC70-3 footprint (2.0 × 2.1 mm) - saves PCB area in wearables, IoT sensors, and compact modules |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring fail-safe startup and low-voltage shutdown. IC Role / Device Role / Timing Role: Monitors main Li-ion supply (3.0–4.2V) and asserts reset if voltage drops below 4.63V during discharge or cold start. Use Value: Prevents corrupted memory writes or erratic MCU behavior during marginal power conditions, meeting IEC 60601 safety requirements. |
Use Scenario: DIN-rail mounted remote I/O units operating in wide-temperature industrial cabinets. IC Role / Device Role / Timing Role: Supervises 5V system rail; provides 20ms reset hold time to ensure FPGA configuration completes before release. Use Value: Eliminates need for discrete RC reset circuits, improving long-term reliability and reducing BOM count in harsh EMI environments. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Low-power wake-up circuits in door module ECUs powered from vehicle battery (9–16V via LDO). IC Role / Device Role / Timing Role: Monitors post-LDO 5V rail; asserts open-drain reset to MCU upon undervoltage event during cranking. Use Value: Open-drain output allows wired-OR with other reset sources (e.g., watchdog), supporting ASIL-B diagnostic coverage. |
Use Scenario: Revenue-grade electricity meters with backup supercapacitor and real-time clock. IC Role / Device Role / Timing Role: Detects main 3.3V supply collapse and holds meter MCU in reset until supercap backup engages. Use Value: 20ms timeout aligns with supercap voltage ramp time; 3µA current draw minimizes self-discharge during extended outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326TASD2+T | Same 4.63V threshold and 20ms timeout, but in SOT23-3 package; higher ICC (8µA at 1.8V) | Larger footprint (2.92 × 1.62 mm vs. 2.0 × 2.1 mm); less suitable for ultra-dense layouts | Select when legacy SOT23 assembly lines are in use and SC70 retooling is impractical |
| TPS3808G33DBVR | 3.3V threshold (not 4.63V); 20ms timeout; push-pull active-low output; 1.6µA ICC at 1.8V | Requires different threshold voltage; no external pullup needed but incompatible with wired-OR reset buses | Choose only if system uses 3.3V supply monitoring and board layout permits push-pull topology |
Compared with MAX6381XR46D2, MAX6326TASD2+T offers identical electrical behavior in a larger, more widely supported package, while TPS3808G33DBVR trades threshold flexibility and open-drain compatibility for lower current and push-pull simplicity - neither is pin-compatible, and both require schematic and layout revision.
Availability
MAX6381XR46D2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6381XR46D2 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 was developed specifically for low-voltage, low-power microprocessor supervision in space- and energy-constrained systems - delivering factory-trimmed thresholds, guaranteed reset timing, and miniature packaging without sacrificing accuracy or temperature stability.
FAQ
What is the exact reset threshold voltage of the MAX6381XR46D2?
The MAX6381XR46D2 has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is derived from the "46" suffix in the part number and confirmed in the Reset Thresholds table of the datasheet. The MAX6381XR46D2 does not support adjustable or dual-threshold configurations.
Does the MAX6381XR46D2 include a manual reset input (MR)?
No, the MAX6381XR46D2 does not feature a manual reset input. MR functionality is only present in selected variants within the MAX6381–MAX6390 family - specifically MAX6384, MAX6385, MAX6386, and MAX6390. The MAX6381XR46D2 is a dedicated single-voltage supervisor with RESET, VCC, and GND pins only.
What package type and dimensions does the MAX6381XR46D2 use?
The MAX6381XR46D2 is supplied in a 3-pin SC70-3 package (package code X3-2), with outline dimensions of 2.0mm × 2.1mm × 0.95mm and wettable flanks. Pin 1 is RESET (open-drain), Pin 2 is VCC, and Pin 3 is GND. This package is distinct from the 4-pin SC70 or 6-pin µDFN variants used by other members of the family.
Can the MAX6381XR46D2 monitor a second voltage rail?
No, the MAX6381XR46D2 does not support auxiliary voltage monitoring. The RESET IN feature is exclusive to MAX6387, MAX6388, and MAX6389. The MAX6381XR46D2 monitors only the VCC supply pin and provides no secondary comparator input or external threshold adjustment capability.
What is the minimum VCC voltage at which the MAX6381XR46D2 guarantees correct reset output state?
The MAX6381XR46D2 guarantees valid RESET output logic state down to VCC = 1.0V, as specified in the Electrical Characteristics table. Below this voltage, the internal circuitry may not operate reliably, and the RESET output is not assured to reflect the true supply condition. This specification makes the MAX6381XR46D2 suitable for deep brownout detection scenarios where other supervisors fail.
MAX6381XR46D2 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:
- 4.63V
- 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
MAX6381XR46D2 FAQ
1.How can I place an order for MAX6381XR46D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR46D2 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 MAX6381XR46D2 reliable?
The price and inventory of MAX6381XR46D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR46D2 is usually 5 days.
3.What payment methods are accepted for MAX6381XR46D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR46D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR46D2?
MAX6381XR46D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR46D2 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 MAX6381XR46D2?
For technical support, including MAX6381XR46D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR46D2 requirements.
6.How does Aetrix verify that MAX6381XR46D2 is sourced from the original manufacturer or authorized distributors?
All MAX6381XR46D2 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 MAX6381XR46D2 meets industry standards.
7.What is the process for return or replacement of MAX6381XR46D2?
All MAX6381XR46D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR46D2, 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 MAX6381XR46D2 part is unused and in its original packaging.
Return procedure for MAX6381XR46D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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