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Analog Devices Inc./Maxim Integrated MAX6381XR22D3+T
- Part No.:
- MAX6381XR22D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR22D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.19V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,830
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Product details
Overview
MAX6381XR22D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring a factory-set 2.19V 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 voltage down to 1.0V, consumes only 3μA at 1.8V, and guarantees valid reset state during brownout conditions in battery-powered controllers and embedded systems.
For engineers reviewing the MAX6381XR22D3+T datasheet, MAX6381XR22D3+T pinout, MAX6381XR22D3+T application, or MAX6381XR22D3+T equivalent, key selection criteria include reset threshold accuracy, ultra-low quiescent current, open-drain output compatibility with mixed-voltage I/O domains, and guaranteed operation down to VCC = 1V for fail-safe power sequencing.
Technical Context
The MAX6381XR22D3+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion period after VCC rises above 2.19V, independent of supply ramp rate.
As a member of the MAX6381–MAX6390 family, it uses BiCMOS process technology and supports only VCC monitoring (no MR or RESET IN inputs). Its open-drain RESET output requires an external pullup resistor and remains valid down to VCC = 1V, enabling robust reset signaling during deep brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V nominal (suffix "22"), ±2.5% over full temperature range - ensures reliable detection of 2.2V supply brownout |
| Reset Timeout | 140ms minimum (suffix "D3") - holds μP in reset long enough for stable clock and memory initialization |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell-powered IoT sensors |
| Operating Voltage | 1.0V to 5.5V - supports valid reset assertion even during severe undervoltage events |
| Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting across voltage domains |
| Temperature Range | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Package | 3-pin SC70 (X3+2 outline) - 1.25mm × 0.85mm footprint for space-constrained PCBs |
Pinout & Package
3-pin SC70 package (outline 21-0075, land pattern 90-0208), 1.25mm × 0.85mm body, 0.5mm pitch, RoHS-compliant lead-free termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; requires external pullup; sinks ≥80µA at VCC ≥ 1.0V |
| 2 | VCC | Power supply input and monitored voltage source; operates from 1.0V to 5.5V |
| 3 | GND | Analog and digital ground reference; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.19V with ±2.5% tolerance over -40°C to +125°C eliminates need for external resistor dividers |
| Ultra-low supply current | 3μA at 1.8V enables >10-year battery life in always-on monitoring applications |
| Open-drain reset output | Supports mixed-voltage systems (e.g., 3.3V RESET line driving 1.8V μP) via external pullup |
| Brownout immunity | Guaranteed valid RESET state down to VCC = 1V prevents spurious release during supply collapse |
| Negative transient rejection | Immune to VCC glitches ≤35µs at 100mV overdrive - suppresses noise-induced false resets |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 2.2V I/O rail in programmable logic controller during cold-cranking when battery dips to 6V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M4 until 2.2V rail stabilizes post-cranking. Use Value: Prevents firmware corruption by holding processor in reset for ≥140ms after 2.19V threshold is crossed, matching MCU boot ROM timing requirements. | Use Scenario: Resets microcontroller in door module during vehicle start-stop cycle where 12V system drops to 7V. IC Role / Device Role / Timing Role: Single-supply voltage monitor providing fail-safe reset signal compatible with 3.3V MCU I/O. Use Value: Open-drain output interfaces directly to 3.3V reset pin using 10kΩ pullup; 3μA quiescent current minimizes parasitic drain on backup battery. |
| Portable Medical Sensor | Smart Energy Meter |
Use Scenario: Powers clinical thermometer with CR2032 coin cell; monitors regulated 2.2V supply during temperature measurement bursts. IC Role / Device Role / Timing Role: Low-power supervisor ensuring μC remains held in reset if 2.2V LDO output sags below 2.19V during RF transmission. Use Value: 3μA supply current extends battery life beyond 5 years; 140ms timeout exceeds typical sensor ADC conversion + BLE transmit sequence. | Use Scenario: Monitors 2.2V RTC and metering ASIC supply in electricity meter exposed to wide ambient temperatures (-40°C to +85°C). IC Role / Device Role / Timing Role: Precision voltage supervisor with ±2.5% threshold accuracy guaranteeing reliable reset across full operating range. Use Value: Eliminates need for calibration; 125°C max rating supports transformer-coupled meter designs with high thermal stress near power components. |
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 | 2.32V reset threshold, same 140ms timeout, identical 3-pin SC70 package | Lacks AEC-Q100 qualification; not rated for automotive under-hood use | Select when cost sensitivity outweighs automotive qualification requirement |
| TPS3808G33DBVR | 3.3V reset threshold, adjustable timeout via capacitor, SOT-23-5 package | Requires external timing capacitor; higher 8μA quiescent current at 1.8V | Select when design requires field-adjustable timeout or dual-voltage monitoring capability |
Compared with MAX809TRD3+T, MAX6381XR22D3+T offers tighter threshold accuracy (±2.5% vs ±3.5%) and automotive qualification; compared with TPS3808G33DBVR, it delivers lower power and fixed timing without external components but lacks adjustability.
Availability
MAX6381XR22D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensors, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6381XR22D3+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 industrial, automotive, and computing applications, with expertise in power management and sensor interface solutions.
The MAX6381–MAX6390 product line delivers ultra-low-power, high-accuracy reset supervisors optimized for battery-operated and thermally demanding embedded systems requiring guaranteed brownout protection.
FAQ
What is the exact reset threshold voltage of MAX6381XR22D3+T and how is it specified?
The MAX6381XR22D3+T has a factory-set nominal reset threshold of 2.19V, derived from suffix "22" in the part number. This value is guaranteed within ±2.5% over the full -40°C to +125°C temperature range, with a tempco of 60ppm/°C. The threshold is trimmed during production and does not require external calibration.
Does MAX6381XR22D3+T support manual reset functionality?
No, MAX6381XR22D3+T does not include a manual reset (MR) input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which supports only VCC monitoring. Manual reset capability is available only in MAX6384–MAX6386 and MAX6390 variants, as confirmed by the Selector Guide and Pin Configurations section.
What package type and dimensions does MAX6381XR22D3+T use?
MAX6381XR22D3+T uses a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208), measuring 1.25mm × 0.85mm with 0.5mm pin pitch. The "+" in the part number indicates RoHS-compliant lead-free termination, and the device is qualified per AEC-Q100 for automotive applications.
How does the open-drain RESET output of MAX6381XR22D3+T interface with a 3.3V microcontroller?
The open-drain RESET output of MAX6381XR22D3+T requires an external pullup resistor to the target microcontroller's I/O voltage (e.g., 3.3V). When asserted, it pulls the line low; when deasserted, the pullup establishes the high state. This allows level translation between the supervisor's 1.0–5.5V VCC domain and the MCU's 3.3V reset input without additional logic.
Is MAX6381XR22D3+T suitable for battery-powered applications with multi-year runtime requirements?
Yes, MAX6381XR22D3+T is specifically designed for ultra-low-power operation, drawing only 3μA at 1.8V and 6μA at 3.6V. Combined with its guaranteed operation down to VCC = 1.0V, this enables reliable brownout detection and reset assertion in coin-cell-powered devices such as portable medical sensors and wireless IoT endpoints targeting >5-year battery life.
MAX6381XR22D3+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:
- 2.19V
- 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
MAX6381XR22D3+T FAQ
1.How can I place an order for MAX6381XR22D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR22D3+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 MAX6381XR22D3+T reliable?
The price and inventory of MAX6381XR22D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR22D3+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR22D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR22D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR22D3+T?
MAX6381XR22D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR22D3+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 MAX6381XR22D3+T?
For technical support, including MAX6381XR22D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR22D3+T requirements.
6.How does Aetrix verify that MAX6381XR22D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR22D3+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 MAX6381XR22D3+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR22D3+T?
All MAX6381XR22D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR22D3+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 MAX6381XR22D3+T part is unused and in its original packaging.
Return procedure for MAX6381XR22D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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