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Analog Devices Inc./Maxim Integrated MAX6381XR29D3+
- Part No.:
- MAX6381XR29D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6381XR29D3+.pdf
- Description:
- MAX6381 SINGLE LOW-VOLTAGE, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:867
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Product details
Overview
MAX6381XR29D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.93V reset threshold, 140ms minimum reset timeout, active-low push-pull reset output, and 3µA supply current at +1.8V. It monitors single-supply VCC in battery-powered or low-voltage embedded systems and guarantees valid reset assertion down to VCC = 1V.
For engineers reviewing the MAX6381XR29D3+ datasheet, MAX6381XR29D3+ pinout, MAX6381XR29D3+ application, or MAX6381XR29D3+ equivalent, key selection considerations include reset threshold accuracy (±2.5% over –40°C to +125°C), SC70-3 package compatibility, negative-going transient immunity, and guaranteed operation at VCC ≥ 1.0V.
Technical Context
The MAX6381XR29D3+ integrates a precision voltage comparator with ±2.5% threshold accuracy over temperature and an internal timer that enforces a minimum 140ms reset timeout after VCC rises above 2.93V. Its push-pull active-low RESET output drives directly without external pull-up and remains valid down to VCC = 1V.
This device belongs to the MAX6381–MAX6390 family of single-supply supervisors optimized for low-voltage microprocessor systems. It lacks manual reset (MR) and auxiliary RESET IN inputs-features reserved for other variants-and uses a fixed internal reference rather than adjustable resistor-divider monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (suffix "29"), ±2.5% tolerance over –40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| Reset Timeout | 140ms minimum (suffix "D3") - holds µP in reset long enough for stable power rail recovery before boot |
| Supply Current | 3µA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Operating Voltage | 1.0V to 5.5V - supports valid reset signaling even during deep brownout (down to 1V) |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor and simplifies PCB layout |
| Package | 3-pin SC70 (X3-2) - 1.25mm × 0.85mm footprint ideal for space-constrained portable designs |
| Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial control applications |
Pinout & Package
MAX6381XR29D3+ is housed in a 3-pin SC70 package (package code X3-2), measuring 1.25mm × 0.85mm × 0.6mm with gull-wing leads. The package is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output driver; must be connected to system ground plane for noise immunity |
| 2 | RESET | Active-low push-pull output; asserts low during VCC undervoltage and remains low for ≥140ms after VCC recovers above 2.93V |
| 3 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and serves as reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±2.5% accuracy over full temperature range - eliminates external resistor calibration and reduces BOM count |
| Ultra-low quiescent current | 3µA at +1.8V - extends battery life in always-on edge nodes without compromising supervision reliability |
| Valid reset down to VCC = 1V | Guaranteed logic-level RESET assertion even during severe brownout - prevents µP runaway before complete power collapse |
| Negative-going transient immunity | Rejects short VCC glitches (e.g., <35µs at 100mV overdrive) - avoids spurious resets in electrically noisy environments |
| SC70-3 footprint | 1.25mm × 0.85mm body size - enables high-density placement on compact PCBs without thermal derating penalties |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless temperature sensor powered by CR2032 coin cell operates intermittently, requiring reliable power-on reset and brownout protection during voltage sag. IC Role / Device Role / Timing Role: Supervisory IC providing active-low reset pulse to ARM Cortex-M0+ MCU upon VCC drop below 2.93V, with 140ms timeout ensuring stable core voltage before firmware execution. Use Value: 3µA supply current extends battery life beyond 5 years; SC70-3 package fits within 3.2mm² board area budget. | Use Scenario: An isolated digital input module in a factory automation controller must survive 24VDC supply transients and maintain deterministic startup behavior. IC Role / Device Role / Timing Role: Single-supply supervisor asserting reset to FPGA configuration logic when field-side 3.3V rail dips due to EMI or load switching. Use Value: ±2.5% threshold accuracy ensures consistent trip point across –40°C to +125°C ambient; 140ms timeout accommodates slow-rising industrial rails. |
| Automotive Body Control Unit | Medical Wearable Monitor |
Use Scenario: A LIN bus–based door module experiences cold-cranking voltage drops to 1.8V; µP must remain held in reset until supply stabilizes. IC Role / Device Role / Timing Role: Reset supervisor monitoring main 3.3V domain, asserting active-low signal to PIC18F MCU until VCC exceeds 2.93V and sustains for ≥140ms. Use Value: Valid operation down to VCC = 1.0V prevents premature release of reset during deep brownout; AEC-Q100 qualification support available via Maxim's automotive-grade variants. | Use Scenario: A wrist-worn ECG patch uses a 1.8V LDO to power its analog front-end and BLE SoC, requiring fail-safe reset during battery aging or low-temperature discharge. IC Role / Device Role / Timing Role: Low-voltage supervisor generating clean reset pulse to nRF52832 SoC on power-up and brownout events, using push-pull output to drive SoC's dedicated reset pin. Use Value: Push-pull output eliminates external pull-up resistor - reducing component count and leakage path in ultra-low-power design; SC70-3 footprint aligns with tight flex PCB routing constraints. |
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 | 2.93V threshold, 140ms timeout, SOT23-3 package (larger than SC70-3), 12µA ICC at +1.8V | Higher supply current limits battery lifetime; larger footprint increases PCB area by ~2.5× | Select when legacy SOT23-3 compatibility is required and ultra-low ICC is not critical |
| TPS3808G33DBVR | 3.3V threshold (not 2.93V), 200ms timeout, SOT23-5 package, 1.1µA ICC at +1.8V | Fixed 3.3V threshold mismatches 2.93V requirement; extra pins add complexity without benefit for simple single-rail monitoring | Select only if system rail is exactly 3.3V and longer timeout is acceptable |
Compared with MAX6381XR29D3+, MAX809TRD3+T consumes 4× more current and occupies more board space, while TPS3808G33DBVR offers lower ICC but cannot match the precise 2.93V trip point or SC70-3 size-making MAX6381XR29D3+ optimal for space- and energy-constrained 2.9V–3.0V systems.
Availability
MAX6381XR29D3+ is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6381XR29D3+ 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 power efficiency and reliability.
The MAX6381–MAX6390 product line delivers ultra-low-power, single/dual-supply microprocessor supervisory circuits targeting space-constrained, battery-operated, and high-temperature embedded systems where deterministic reset behavior is critical.
FAQ
What is the exact reset threshold voltage of MAX6381XR29D3+ and how accurate is it over temperature?
The MAX6381XR29D3+ has a factory-set nominal reset threshold of 2.93V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet and applies directly to the MAX6381XR29D3+ variant, not just the broader family.
Does MAX6381XR29D3+ include a manual reset input (MR) or auxiliary RESET IN pin?
No, MAX6381XR29D3+ does not include MR or RESET IN functionality. It is a basic single-supply supervisor with only VCC, GND, and RESET pins. Manual reset capability is present only in MAX6384–MAX6386 and MAX6390 variants, while RESET IN is exclusive to MAX6387–MAX6389 - neither feature is implemented in the MAX6381XR29D3+.
What is the supply current of MAX6381XR29D3+ at different VCC levels?
The MAX6381XR29D3+ draws 3µA typical at +1.8V, 4µA at +2.5V, 6µA at +3.6V, and 7µA at +5.5V (all at TA = +25°C). These values are measured with no load and are specified in the Electrical Characteristics table. Current increases slightly with temperature but remains below 13µA across –40°C to +125°C.
Can MAX6381XR29D3+ operate reliably when VCC drops below 1.8V?
Yes, MAX6381XR29D3+ guarantees correct reset output logic state down to VCC = 1.0V. Its internal circuitry remains functional and the active-low RESET output is asserted and held valid even at 1V supply - a key differentiator for deep-brownout resilience in battery-depleted scenarios.
Is MAX6381XR29D3+ pin-compatible with other reset ICs like MAX809 or MAX6326?
MAX6381XR29D3+ is pin-compatible with MAX809/MAX810/MAX803/MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348, and MAX6711/MAX6712/MAX6713 in the same 3-pin SC70 package. However, note that MAX809 series use SOT23-3, so physical pin compatibility requires matching package type - MAX6381XR29D3+ matches only SC70-3 variants of those parts.
MAX6381XR29D3+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6381XR29D3+ FAQ
1.How can I place an order for MAX6381XR29D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6381XR29D3+ 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 MAX6381XR29D3+ reliable?
The price and inventory of MAX6381XR29D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6381XR29D3+ is usually 5 days.
3.What payment methods are accepted for MAX6381XR29D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6381XR29D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6381XR29D3+?
MAX6381XR29D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6381XR29D3+ 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 MAX6381XR29D3+?
For technical support, including MAX6381XR29D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6381XR29D3+ requirements.
6.How does Aetrix verify that MAX6381XR29D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6381XR29D3+ 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 MAX6381XR29D3+ meets industry standards.
7.What is the process for return or replacement of MAX6381XR29D3+?
All MAX6381XR29D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6381XR29D3+, 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 MAX6381XR29D3+ part is unused and in its original packaging.
Return procedure for MAX6381XR29D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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