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Analog Devices Inc./Maxim Integrated MAX6379XR44
- Part No.:
- MAX6379XR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6379XR44.pdf
- Description:
- IC SUPERVISOR UL LO PWR VOLT DET
- Quantity:
- Payment:
- Shipping:
Inventory:1,698
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Product details
Overview
MAX6379XR44 from Maxim Integrated is an ultra-low-power, active-high push-pull voltage detector designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 4.38V threshold (±2.5% over temperature), 500nA supply current at +25°C, and guaranteed operation down to VCC = 1V. It asserts a logic-high output when VCC falls below the threshold and is used in portable equipment power sequencing and Li+-battery undervoltage lockout.
For engineers reviewing the MAX6379XR44 datasheet, MAX6379XR44 pinout, MAX6379XR44 application, or MAX6379XR44 equivalent, key selection criteria include its active-high push-pull output configuration, SC70-3 package footprint, 4.38V trip point with hysteresis, and immunity to sub-10µs VCC transients - all critical for reliable reset generation in space-constrained, low-quiescent-current designs.
Technical Context
The MAX6379XR44 integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 4.38V detection without external components. Its internal architecture ensures stable threshold accuracy across -40°C to +85°C and eliminates manual calibration.
This device operates as a single-function supervisor: it monitors VCC continuously and drives OUT high only when VCC drops below 4.38V ±2.5%. The push-pull output provides rail-to-rail drive capability (VOH ≥0.8×VCC, VOL ≤0.4V) with no external pull-up required, distinguishing it from open-drain variants like MAX6377/MAX6380.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal, ±2.5% over -40°C to +85°C - ensures accurate Li+ battery or 5V rail undervoltage detection without recalibration |
| Supply Current | 500nA at +25°C - enables multi-year operation on coin-cell batteries in always-on monitoring applications |
| Output Type | Active-high push-pull - drives high/low actively; eliminates need for external pull-up resistor and supports direct MCU reset input |
| VCC Operating Range | 1.2V to 5.5V - guarantees correct output state even during brownout conditions down to 1V, supporting deep-sleep wake-up integrity |
| Propagation Delay | 9.5µs typical (falling edge) - fast response to supply collapse while rejecting noise spikes under 10µs duration |
| Hysteresis | 100mV - prevents chatter during slow VCC recovery by enforcing 4.28V release threshold |
| Package | SC70-3 (2.0mm × 2.1mm × 0.95mm) - enables placement in ultra-dense portable PCB layouts where SOT23-3 is too large |
Pinout & Package
MAX6379XR44 is housed in a 3-pin SC70 package (2.0mm × 2.1mm × 0.95mm body, 0.65mm pitch). Pin 1 is GND, Pin 2 is OUT, and Pin 3 is VCC - consistent with SC70-3 standard pinout and compatible with automated pick-and-place.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return path for internal bandgap and comparator; must be connected directly to system ground plane |
| 2 | OUT | Active-high push-pull output; sinks up to 1.2mA or sources up to 500µA; drives MCU reset pin directly without external components |
| 3 | VCC | Supply input (1.2V–5.5V); powers internal circuitry and defines output swing range; decoupling capacitor recommended within 1cm |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 500nA supply current | Extends battery life in always-on monitoring circuits - e.g., >10 years on CR2032 in periodic wake-up systems |
| Factory-trimmed 4.38V threshold | Eliminates production calibration; meets ±2.5% tolerance across full industrial temperature range without derating |
| Push-pull active-high output | Directly interfaces with standard CMOS reset inputs (e.g., ARM Cortex-M, MSP430) without pull-up resistor or level-shifting |
| 100mV built-in hysteresis | Prevents false resets during noisy or slowly recovering supplies - release occurs at 4.28V, not 4.38V |
| VCC transient immunity | Rejects negative-going glitches <10µs wide at 4.38V–VCC overdrive, ensuring robust operation in electrically noisy environments |
Applications
| Battery Undervoltage Lockout | Microcontroller Reset Supervision |
|---|---|
|
Use Scenario: Monitoring a 3.7V Li+ battery in a Bluetooth tracker to disable load before cell damage occurs at ~3.0V. IC Role / Device Role / Timing Role: Voltage detector asserting active-high reset signal to PMIC enable line when battery drops below 4.38V (preemptive shutdown margin). Use Value: Prevents deep discharge by triggering controlled shutdown at precisely 4.38V, leveraging ±2.5% threshold accuracy to avoid premature cutoff. |
Use Scenario: Ensuring clean startup of an STM32L4 microcontroller powered from a 5V DC/DC converter with variable load transients. IC Role / Device Role / Timing Role: Active-high reset generator holding MCU in reset until 5V rail stabilizes above 4.38V after power-on. Use Value: Guarantees valid reset assertion time via 9.5µs propagation delay and eliminates need for RC-based reset circuits. |
| Portable Medical Sensor Power Sequencing | Industrial IoT Edge Node Brownout Protection |
|
Use Scenario: Sequencing power to analog front-end and BLE radio in a wearable ECG patch using a single 3.3V LDO. IC Role / Device Role / Timing Role: Supervisor enabling radio only after analog supply reaches 4.38V - preventing RF instability due to marginal voltage. Use Value: Uses push-pull output to drive enable pin of secondary regulator, eliminating external MOSFET and reducing BOM count by one component. |
Use Scenario: Protecting LoRaWAN node firmware from corruption during grid-powered battery backup switchover with momentary dips. IC Role / Device Role / Timing Role: Detecting VCC sag below 4.38V and asserting reset to halt CPU execution before memory write errors occur. Use Value: 1V minimum operating voltage ensures reset remains valid even during severe brownouts, preserving data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6379UR44 | SOT23-3 package (2.9mm × 1.6mm), identical electrical specs and 4.38V threshold | Requires larger PCB footprint; better thermal dissipation but incompatible with SC70 land pattern | Select UR44 for manual assembly or thermal-heavy environments; XR44 for space-constrained automated production |
| TLV803EB33DBZR | 3.3V threshold, open-drain output, 1.8µA supply current, SOT23-3 | Requires external pull-up; unsuitable for direct MCU reset without level translation; higher quiescent draw | Choose only if 3.3V detection and open-drain flexibility are mandatory; not a functional substitute for 4.38V active-high requirement |
Compared with MAX6379XR44, the UR44 offers identical functionality in a larger package ideal for prototyping, while TLV803EB33DBZR serves different voltage and interface needs - neither is pin-compatible, and only UR44 matches the 4.38V/active-high/SC70 specification set.
Availability
MAX6379XR44 is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and industrial edge nodes requiring stable component supply with long-term lifecycle assurance and lead-free compliance.
Supply support for MAX6379XR44 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6375–MAX6380 family was designed specifically for ultra-low-power voltage monitoring in space- and energy-constrained applications, delivering factory-trimmed accuracy without external components.
FAQ
What is the exact reset threshold voltage of the MAX6379XR44?
The MAX6379XR44 has a factory-trimmed nominal reset threshold of 4.38V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (-40°C to +85°C). This value is laser-trimmed during production and does not require external calibration. The actual threshold is specified as 4.27V (min) to 4.49V (max) at +25°C, and 4.21V (min) to 4.55V (max) across temperature.
Does the MAX6379XR44 require any external components to operate?
No, the MAX6379XR44 requires no external components. Its precision bandgap reference, comparator, and trimmed resistor network are fully integrated. Only a 0.1µF ceramic decoupling capacitor on VCC is recommended for noise immunity. Unlike open-drain detectors, it needs no pull-up resistor due to its active-high push-pull output structure.
What is the supply current consumption of the MAX6379XR44 at room temperature?
The MAX6379XR44 draws just 500nA typical supply current at +25°C, making it suitable for multi-year battery operation. This ultra-low quiescent current is maintained across its full 1.2V to 5.5V VCC range and remains below 1.0µA over the entire -40°C to +85°C operating temperature range per datasheet specifications.
Can the MAX6379XR44 operate reliably during short VCC transients?
Yes, the MAX6379XR44 is designed to ignore fast negative-going VCC transients. According to its Typical Operating Characteristics, it rejects glitches shorter than ~10µs when the overdrive (VTH – VCC) is 100mV. This immunity is built into the internal comparator design and requires no external filtering, enhancing reliability in electrically noisy systems.
What package type and dimensions does the MAX6379XR44 use?
The MAX6379XR44 uses the SC70-3 package: 2.0mm × 2.1mm × 0.95mm body size with 0.65mm lead pitch. Pin 1 is GND, Pin 2 is OUT, and Pin 3 is VCC - matching JEDEC MO-203AA outline. This compact footprint is 30% smaller than SOT23-3 and optimized for high-density portable PCBs.
MAX6379XR44 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:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6379XR44 FAQ
1.How can I place an order for MAX6379XR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6379XR44 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 MAX6379XR44 reliable?
The price and inventory of MAX6379XR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6379XR44 is usually 5 days.
3.What payment methods are accepted for MAX6379XR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6379XR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6379XR44?
MAX6379XR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6379XR44 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 MAX6379XR44?
For technical support, including MAX6379XR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6379XR44 requirements.
6.How does Aetrix verify that MAX6379XR44 is sourced from the original manufacturer or authorized distributors?
All MAX6379XR44 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 MAX6379XR44 meets industry standards.
7.What is the process for return or replacement of MAX6379XR44?
All MAX6379XR44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6379XR44, 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 MAX6379XR44 part is unused and in its original packaging.
Return procedure for MAX6379XR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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