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Analog Devices Inc./Maxim Integrated MAX6379UR44
- Part No.:
- MAX6379UR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6379UR44.pdf
- Description:
- IC SUPERVISOR UL LO PWR VOLT DET
- Quantity:
- Payment:
- Shipping:
Inventory:1,953
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Product details
Overview
MAX6379UR44 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, and guaranteed operation down to 1V VCC. It asserts a logic-high output when VCC falls below threshold and is used in portable equipment power sequencing and Li+-battery voltage supervision.
For engineers reviewing the MAX6379UR44 datasheet, MAX6379UR44 pinout, MAX6379UR44 application, or MAX6379UR44 equivalent, key selection criteria include its active-high push-pull output configuration, 4.38V trip point, SC70/SOT23-3 package compatibility, transient immunity up to 200µs at 100mV overdrive, and support for single-supply monitoring without external components.
Technical Context
The MAX6379UR44 implements a precision bandgap reference and comparator with internally trimmed resistors to set its 4.38V detection threshold. Its active-high push-pull output drives high (VOH ≥ 0.8×VCC) when VCC drops below VTH and low (VOL ≤ 0.4V) otherwise, eliminating need for external pull-up resistors.
It provides built-in immunity to fast VCC transients-rejecting negative glitches up to 200µs duration when VCC dips 100mV below VTH-and operates reliably across -40°C to +85°C with ±2.5% threshold accuracy and 40ppm/°C tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal, ±2.5% over -40°C to +85°C - ensures accurate brown-out detection for 4.5V-regulated rails |
| Supply Current | 500nA typical - enables multi-year battery life in coin-cell–powered devices |
| Output Type | Active-high push-pull - directly interfaces with µP reset inputs without pull-up resistor |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brown-out and full supply range |
| Propagation Delay | 9.5µs typical (falling edge) - fast response to supply faults while rejecting sub-µs noise |
| Threshold Hysteresis | 100mV - prevents output oscillation near trip point during slow VCC recovery |
| Tempco | 40ppm/°C - maintains tight threshold stability across industrial temperature range |
Pinout & Package
MAX6379UR44 is packaged in a 3-pin SOT23-3 (lead-free, tape-and-reel). Pin 1 = GND, Pin 2 = OUT (active-high push-pull), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal bandgap and comparator - must be low-impedance connection to system ground plane |
| 2 | OUT | Active-high push-pull output - sources current when asserted (VCC < VTH); sinks current when deasserted |
| 3 | VCC | Supply input - powers internal circuitry and defines detection domain; valid from 1.2V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 500nA enables >10-year shelf life in energy-harvesting and IoT sensor nodes |
| No external components | Factory-trimmed threshold and hysteresis eliminate calibration resistors and reduce BOM count |
| Transient immunity | Rejects VCC glitches ≤200µs at 100mV overdrive - avoids false resets in noisy power environments |
| Guaranteed state down to 1V | Ensures deterministic reset assertion even during severe brown-out conditions |
| Push-pull active-high output | Directly drives standard CMOS reset inputs without pull-up, reducing layout complexity and leakage paths |
Applications
| Li+-Battery Supervision | Microcontroller Reset Control |
|---|---|
Use Scenario: Monitoring single-cell Li+ battery voltage (3.0V–4.2V) to prevent deep discharge and trigger graceful shutdown before cutoff. IC Role / Device Role / Timing Role: Voltage detector asserting active-high reset signal to microcontroller when cell voltage drops below 4.38V - indicating end-of-charge or fault condition. Use Value: Prevents data corruption and extends battery cycle life by enabling controlled power-down prior to undervoltage lockout. |
Use Scenario: Providing reliable power-on and brown-out reset to ARM Cortex-M0+ microcontrollers in industrial sensors. IC Role / Device Role / Timing Role: Active-high push-pull reset generator ensuring µP enters known state on power-up and during supply sag. Use Value: Eliminates need for external RC network or supervisor IC with higher quiescent current, reducing system power by >1µA. |
| Portable Medical Device Power Sequencing | Low-Power Wireless Sensor Node |
Use Scenario: Enabling safe power sequencing in handheld glucose meters where main DC/DC output must stabilize before enabling analog front-end. IC Role / Device Role / Timing Role: Monitoring regulated 4.5V rail and asserting reset until stable, then releasing µP to initialize peripherals. Use Value: Guarantees analog circuitry is powered and settled before digital initialization, preventing measurement offset errors. |
Use Scenario: Supervising coin-cell–powered BLE beacon operating intermittently with 10s sleep cycles. IC Role / Device Role / Timing Role: Detecting battery decay below 4.38V and triggering firmware alert before capacity exhaustion. Use Value: Extends usable battery life by 12–18 months versus higher-current supervisors, verified in field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6379XR44 | Identical electrical specs but in SC70-3 package (smaller footprint, different thermal resistance) | Preferred for space-constrained PCBs where 1.25mm × 0.8mm SC70 saves board area vs. 2.9mm × 1.6mm SOT23 | Select XR44 for miniaturized wearables; UR44 for standard assembly lines with SOT23 tooling |
| TPS3808G33DBVR | 4.38V threshold, but active-low open-drain output and 1.6µA ICC - 3.2× higher quiescent current | Requires external pull-up resistor and cannot drive CMOS inputs directly; suited for wired systems with ample power budget | Choose only if legacy design uses open-drain interface or TI ecosystem preference outweighs 1.1µA power penalty |
Compared with MAX6379XR44, the MAX6379UR44 offers identical detection performance in a more manufacturable SOT23 package; versus TPS3808G33DBVR, it delivers 3.2× lower supply current and eliminates external components, making it optimal for battery longevity-critical designs.
Availability
MAX6379UR44 is available at Aetrix Electronics and suitable for portable medical devices, wireless sensor nodes, Li+-battery management systems, and industrial microcontroller-based equipment requiring stable component supply and long-term lifecycle support.
Supply support for MAX6379UR44 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 power, sensing, and interface applications, with emphasis on low-power, high-reliability solutions.
The MAX6375–MAX6380 family was developed specifically for ultra-low-power voltage monitoring in battery-operated and energy-constrained systems, delivering factory-trimmed accuracy without external components.
FAQ
What is the exact reset threshold voltage of the MAX6379UR44?
The MAX6379UR44 has a factory-trimmed nominal reset threshold of 4.38V, with guaranteed accuracy of ±2.5% over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 1 of the official datasheet under suffix "R44", and applies specifically to the MAX6379UR44 variant-not the broader MAX6379 family.
Does the MAX6379UR44 require any external components to operate?
No, the MAX6379UR44 requires no external components. Its precision bandgap reference, comparator, and threshold-setting resistors are fully integrated and factory-trimmed. Unlike adjustable supervisors, it needs only VCC, GND, and the load connected to OUT - eliminating calibration parts and reducing PCB area and BOM cost.
What is the output configuration of the MAX6379UR44, and how does it interface with a microcontroller?
The MAX6379UR44 features an active-high push-pull output. When VCC drops below 4.38V, OUT drives high (≥0.8×VCC); otherwise, it drives low (≤0.4V). This allows direct connection to standard CMOS reset inputs without pull-up resistors - simplifying layout and avoiding leakage paths that compromise ultra-low-power operation in the MAX6379UR44.
Can the MAX6379UR44 operate reliably during fast power supply transients?
Yes, the MAX6379UR44 is designed to ignore fast negative-going VCC transients. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive", it rejects glitches up to 200µs wide when VCC dips 100mV below 4.38V - preventing spurious resets in electrically noisy environments where the MAX6379UR44 is deployed.
What package options are available for the MAX6379UR44, and is lead-free compliance supported?
The MAX6379UR44 is offered exclusively in the 3-pin SOT23-3 package (lead-free, RoHS-compliant, tape-and-reel). Lead-free versions are ordered using the "+T" suffix (e.g., MAX6379UR44+T), while "-T" denotes leaded packaging. The SC70-3 variant (MAX6379XR44) is pin-compatible but physically smaller and thermally distinct.
MAX6379UR44 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
MAX6379UR44 FAQ
1.How can I place an order for MAX6379UR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6379UR44 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 MAX6379UR44 reliable?
The price and inventory of MAX6379UR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6379UR44 is usually 5 days.
3.What payment methods are accepted for MAX6379UR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6379UR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6379UR44?
MAX6379UR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6379UR44 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 MAX6379UR44?
For technical support, including MAX6379UR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6379UR44 requirements.
6.How does Aetrix verify that MAX6379UR44 is sourced from the original manufacturer or authorized distributors?
All MAX6379UR44 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 MAX6379UR44 meets industry standards.
7.What is the process for return or replacement of MAX6379UR44?
All MAX6379UR44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6379UR44, 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 MAX6379UR44 part is unused and in its original packaging.
Return procedure for MAX6379UR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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