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Analog Devices Inc./Maxim Integrated MAX6381XR44D2+T
- Part No.:
- MAX6381XR44D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR44D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,523
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Product details
Overview
MAX6381XR44D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit in a 3-pin SC70 package, featuring a factory-set 4.38V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, and active-low open-drain 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 - used in battery-powered instrumentation and dual-voltage embedded systems requiring precise brownout protection.
For engineers reviewing the MAX6381XR44D2+T datasheet, MAX6381XR44D2+T pinout, MAX6381XR44D2+T application, or MAX6381XR44D2+T equivalent, key selection criteria include its 4.38V reset threshold accuracy, 20ms timeout timing, open-drain output compatibility with I²C-bus logic levels, guaranteed operation at VCC ≥ 1V, and AEC-Q100-qualified automotive variants.
Technical Context
The MAX6381XR44D2+T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over full temperature range (-40°C to +125°C) and 60ppm/°C tempco. Its internal timer generates a fixed 20ms minimum reset timeout after VCC rises above 4.38V, independent of supply ramp rate.
No manual reset (MR) or auxiliary RESET IN inputs are present - this variant belongs to the base MAX6381 series, which supports only VCC monitoring via open-drain RESET output requiring external pullup, and lacks debounced MR or dual-supply tracking capability found in MAX6384–MAX6390 derivatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (4.27V min / 4.48V max); sets brownout detection point for +5V or +3.3V rails |
| Reset Timeout | 20ms minimum; ensures μP remains held in reset long enough for power stabilization |
| Supply Current | 3μA at +1.8V; enables multi-year battery life in portable equipment |
| Operating Voltage | +1.0V to +5.5V; guarantees functional reset assertion even during deep brownout |
| Output Type | Active-low open-drain; requires external pullup, compatible with mixed-voltage I/O domains |
| Temp Range | -40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| Reset Accuracy | ±2.5% over full temperature range; eliminates need for external calibration in harsh thermal environments |
Pinout & Package
Package: 3-pin SC70 (outline 21-0075, land pattern 90-0208), footprint-compatible with SOT-23 but smaller (1.25mm × 0.85mm × 0.55mm height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; sinks current when asserted; requires external pullup resistor |
| 2 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and comparator |
| 3 | GND | Analog/digital ground reference; must be connected directly to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V with ±2.5% tolerance over -40°C to +125°C - eliminates external resistor divider and calibration |
| Ultra-low quiescent current | 3μA at +1.8V - extends battery life in always-on sensor nodes and portable medical devices |
| Valid reset down to VCC = 1V | Ensures deterministic μP initialization during slow power-down sequences without external supervision |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches up to 100mV below threshold - reduces false resets in noisy power environments |
| Open-drain output architecture | Supports wired-OR reset buses and level-shifting across 1.8V/3.3V/5V domains without additional logic |
Applications
| Power Monitoring in Portable Instruments | Dual-Voltage System Supervision |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell (3.0V–4.2V) with 3.3V logic and 1.8V core rails. IC Role / Device Role / Timing Role: Monitors main 3.3V supply; asserts open-drain RESET to hold MCU until stable post-power-up. Use Value: 4.38V threshold prevents premature release during Li-ion discharge sag; 20ms timeout accommodates LDO settling. | Use Scenario: Industrial PLC module with separate 5V analog and 3.3V digital supplies. IC Role / Device Role / Timing Role: Dedicated supervisor for 5V rail only; RESET line shared across multiple ICs via wired-OR. Use Value: Open-drain output enables safe reset bus sharing; ±2.5% accuracy ensures consistent trip point across temperature swings. |
| Automotive Body Control Module | Battery-Powered IoT Sensor Node |
Use Scenario: Under-dash BCM operating from 9V–16V vehicle battery via 5V LDO, exposed to load-dump transients. IC Role / Device Role / Timing Role: Primary VCC supervisor for 5V domain; detects brownout during cranking (9V dips). Use Value: -40°C to +125°C rating and AEC-Q100 qualification ensure reliability; 20ms timeout avoids spurious resets during short dips. | Use Scenario: Wireless temperature sensor node using coin-cell battery and ultra-low-power MCU. IC Role / Device Role / Timing Role: Resets MCU if regulated 1.8V supply drops below 4.38V-equivalent threshold (via resistor divider on VCC). Use Value: 3μA supply current minimizes standby drain; open-drain output interfaces directly with MCU's 1.8V reset pin. |
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 | 4.38V threshold, 20ms timeout, push-pull active-low output; higher ICC (15μA @ +5.5V) | Lacks open-drain flexibility; not suitable for wired-OR or mixed-voltage buses | Select when board layout prohibits external pullup or when driving high-capacitance reset lines directly |
| TPS3808G33DBVR | 3.3V threshold (not 4.38V); adjustable timeout via capacitor; 1.6μA ICC @ +3.3V | Requires external RC network; unsuitable for fixed-threshold, space-constrained designs | Select when threshold must match 3.3V rail exactly and lowest possible current is critical |
Compared with MAX809TRD2+T, MAX6381XR44D2+T offers lower power and open-drain flexibility but requires pullup; versus TPS3808G33DBVR, it delivers fixed 4.38V accuracy without external components but consumes slightly more current in 3.3V systems.
Availability
MAX6381XR44D2+T is available at Aetrix Electronics and suitable for portable instrumentation, automotive body electronics, dual-voltage industrial controllers, and battery-powered IoT sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for MAX6381XR44D2+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, communications, and computing markets, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family targets space-constrained, battery-sensitive applications needing accurate, low-current power-supply supervision - especially where open-drain reset signaling or AEC-Q100 compliance is required.
FAQ
What is the exact reset threshold voltage of MAX6381XR44D2+T and how stable is it over temperature?
The MAX6381XR44D2+T has a nominal reset threshold of 4.38V, with a guaranteed range of 4.27V to 4.48V at +25°C and ±2.5% variation over -40°C to +125°C. This corresponds to a worst-case deviation of ±109.5mV across temperature, supported by 60ppm/°C tempco and production-tested accuracy - critical for reliable brownout detection in automotive and industrial environments where MAX6381XR44D2+T is deployed.
Does MAX6381XR44D2+T include a manual reset input (MR) or auxiliary voltage monitor (RESET IN)?
No, MAX6381XR44D2+T does not include MR or RESET IN functionality. It belongs to the base MAX6381 series, which provides only VCC monitoring and open-drain active-low RESET output. Manual reset capability is exclusive to MAX6384/MAX6385/MAX6386/MAX6390 variants, and auxiliary voltage monitoring is limited to MAX6387/MAX6388/MAX6389 - confirming that MAX6381XR44D2+T is a minimal-feature, cost-optimized supervisor for single-rail applications.
What package type and pin count does MAX6381XR44D2+T use, and is it RoHS-compliant?
MAX6381XR44D2+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208), measuring 1.25mm × 0.85mm with 0.55mm height. The "+T" suffix confirms lead(Pb)-free and RoHS-compliant construction per Maxim Integrated's ordering nomenclature - verified in the official datasheet's Package Information section and Ordering Information table.
Can MAX6381XR44D2+T operate reliably when VCC drops below 1.8V?
Yes, MAX6381XR44D2+T guarantees correct reset assertion and deassertion down to VCC = 1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Its internal circuitry remains functional and the RESET output state is valid even at 1V, enabling robust behavior during deep brownout conditions - a key differentiator versus many competitors whose reset outputs become undefined below 1.5V. This feature is explicitly confirmed for MAX6381XR44D2+T in the datasheet's "Ensuring a Valid RESET Output Down to VCC = 0V" section.
Is MAX6381XR44D2+T pin-compatible with other members of the MAX6381–MAX6390 family?
MAX6381XR44D2+T is pin-compatible only with other 3-pin SC70 variants in the same functional group: MAX6381, MAX6382, and MAX6383. It shares identical pinout (RESET/VCC/GND) and footprint with those parts. However, it is *not* pin-compatible with 4-pin SC70 (e.g., MAX6384) or 6-pin μDFN variants due to differing pin counts and functions - such as MR or RESET IN - which appear on larger packages. This distinction is clearly shown in the Pin Configurations and Selector Guide sections of the MAX6381–MAX6390 datasheet.
MAX6381XR44D2+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:
- 4.38V
- 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
MAX6381XR44D2+T FAQ
1.How can I place an order for MAX6381XR44D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR44D2+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 MAX6381XR44D2+T reliable?
The price and inventory of MAX6381XR44D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR44D2+T is usually 5 days.
3.What payment methods are accepted for MAX6381XR44D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR44D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR44D2+T?
MAX6381XR44D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR44D2+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 MAX6381XR44D2+T?
For technical support, including MAX6381XR44D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR44D2+T requirements.
6.How does Aetrix verify that MAX6381XR44D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6381XR44D2+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 MAX6381XR44D2+T meets industry standards.
7.What is the process for return or replacement of MAX6381XR44D2+T?
All MAX6381XR44D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR44D2+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 MAX6381XR44D2+T part is unused and in its original packaging.
Return procedure for MAX6381XR44D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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