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Analog Devices Inc./Maxim Integrated MAX6378UR44+
- Part No.:
- MAX6378UR44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6378UR44+.pdf
- Description:
- MAX6378 3-PIN, ULTRA-LOW-POWER V
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
MAX6378UR44+ from Maxim Integrated is an ultra-low-power, active-low voltage detector IC designed for precision supply monitoring in battery-powered systems. It features a factory-trimmed 4.38V threshold (±2.5% over temperature), 500nA supply current, push-pull output, and operates from 1.2V to 5.5V VCC - ideal for Li+-based power rails and microcontroller reset supervision.
For engineers reviewing the MAX6378UR44+ datasheet, MAX6378UR44+ pinout, MAX6378UR44+ application, or MAX6378UR44+ equivalent, this device serves as a space-constrained, low-quiescent-current reset supervisor requiring no external components, with transient immunity and guaranteed logic state down to 1V VCC.
Technical Context
The MAX6378UR44+ integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to deliver fixed 4.38V detection without calibration. Its internal architecture ensures stable trip point across -40°C to +85°C with ±2.5% accuracy and 40ppm/°C tempco.
It asserts an active-low push-pull output when VCC falls below threshold, with propagation delay of 9.5µs (typ) and hysteresis of 100mV. The device ignores fast transients - rejecting glitches up to 200µs wide at 100mV overdrive - and maintains valid logic state down to 1V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (factory-trimmed, ±2.5% over -40°C to +85°C) - sets precise brown-out point for 4.5V nominal supplies |
| Supply Current | 500nA (typ at +25°C) - enables multi-year operation on coin-cell batteries |
| Output Type | Active-low push-pull - drives MCU RESET directly without pull-up resistor |
| VCC Range | 1.2V to 5.5V - guarantees correct output state even during deep brown-out or startup |
| Propagation Delay | 9.5µs (typ) - provides fast, deterministic reset assertion for real-time systems |
| Hysteresis | 100mV - prevents chatter near threshold during slow-ramping or noisy supplies |
| Tempco | 40ppm/°C - ensures minimal drift across industrial temperature range |
Pinout & Package
MAX6378UR44+ is housed in a lead-free 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with SC70-3 but with higher power dissipation rating (320mW at +70°C).
| 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-low push-pull output - sinks 1.2mA or sources 500µA; directly interfaces to CMOS reset inputs |
| 3 | VCC | Supply input - monitors this rail; operates down to 1.2V and remains functional to 1V for latched state integrity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 500nA ICC | Extends battery life in always-on IoT sensors and wearables beyond 10 years on CR2032 |
| ±2.5% VTH accuracy over temp | Eliminates need for field calibration or margining in automotive and industrial designs |
| No external components required | Reduces BOM count, PCB area, and qualification effort vs. discrete resistor-divider + comparator solutions |
| 100mV hysteresis | Prevents false resets during supply ripple or step-load transients in DC/DC converter outputs |
| Transient immunity (≤200µs @ 100mV) | Rejects ESD-induced supply dips and switching noise without additional filtering capacitors |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by single Li+ cell with regulated 3.3V rail. IC Role / Device Role / Timing Role: Voltage detector supervising 3.3V LDO output to assert MCU reset if battery drops below safe operating level. Use Value: Prevents data corruption during brown-out while consuming only 500nA - preserving >95% of battery capacity over 2-year service life. |
Use Scenario: Remote analog input module in harsh factory environment with 24V-to-5V conversion. IC Role / Device Role / Timing Role: Reset supervisor for ARM Cortex-M4 controller, monitoring 5V system rail against 4.38V threshold. Use Value: Guarantees clean reset initiation within 9.5µs despite 24V supply transients, meeting IEC 61000-4-4 surge immunity requirements. |
| Smart Meter Battery Backup | Automotive Telematics ECU |
|
Use Scenario: Electricity meter with supercapacitor backup maintaining RTC and memory during AC outage. IC Role / Device Role / Timing Role: Monitors 3.0V backup rail to trigger controlled shutdown before voltage collapses below SRAM retention level. Use Value: 100mV hysteresis avoids oscillation during capacitor discharge curve; ±2.5% accuracy ensures consistent shutdown point across temperature extremes. |
Use Scenario: LTE modem module powered from vehicle's 12V system via buck converter (5V output). IC Role / Device Role / Timing Role: Supervises 5V rail to generate hardware reset for modem SoC during ignition cycling or load dump events. Use Value: Immunity to ≤200µs transients eliminates need for TVS + RC filter, reducing cost and board space in AEC-Q200-compliant design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB33DBZR | 3.3V threshold, 350nA ICC, SOT23-3, open-drain output | Requires external pull-up; lower threshold unsuitable for 4.5V systems | Select when 3.3V reset point and lowest possible ICC are prioritized over push-pull drive |
| TPS3808G33DBVR | 3.3V threshold, 800nA ICC, SOT23-6, adjustable delay, push-pull | Higher quiescent current; larger package; includes programmable reset timeout | Choose when system requires configurable reset pulse width and can accommodate 6-pin footprint |
Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6378UR44+ uniquely delivers 4.38V precision detection with 500nA ICC in a 3-pin SOT23, enabling direct replacement in 4.5V rail supervision without layout changes or external components.
Availability
MAX6378UR44+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup, and automotive telematics ECUs requiring stable component supply with long-term lifecycle support.
Supply support for MAX6378UR44+ 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration.
The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage monitoring in space-constrained, battery-critical systems - delivering precision thresholds, nanoscale ICC, and robust transient rejection in minimal 3-pin packages.
FAQ
What is the exact reset threshold voltage of the MAX6378UR44+?
The MAX6378UR44+ has a factory-trimmed nominal reset threshold of 4.38V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during production and does not require external adjustment - the "R44" suffix in the part number explicitly denotes the 4.38V variant per Maxim's Selector Guide.
Does the MAX6378UR44+ require any external components to function?
No, the MAX6378UR44+ requires zero external components. Its precision bandgap reference, comparator, and trimmed resistor network are fully integrated. Unlike discrete supervisor solutions, it needs no external resistors, capacitors, or pull-up resistors - simplifying layout and improving reliability in compact designs where the MAX6378UR44+ is deployed.
What is the output configuration of the MAX6378UR44+ and how does it interface with a microcontroller?
The MAX6378UR44+ features an active-low push-pull output, meaning it actively drives the OUT pin low during reset and high-impedance (but pulled high internally) otherwise. This allows direct connection to standard CMOS reset inputs without an external pull-up resistor - a key differentiator from open-drain alternatives like the MAX6380UR44+.
How does the MAX6378UR44+ handle supply transients, and what is its maximum tolerable glitch width?
The MAX6378UR44+ rejects fast negative-going VCC transients up to 200µs wide when the overdrive (VTH – VCC) is 100mV, per its Typical Operating Characteristics graph. This built-in transient immunity eliminates the need for external RC filters in noisy environments - a critical feature confirmed in the MAX6378UR44+ datasheet's Applications Information section.
Is the MAX6378UR44+ compatible with both SOT23-3 and SC70-3 footprints?
The MAX6378UR44+ is specified and packaged exclusively in the 3-pin SOT23-3 (MO-178AA) outline, not SC70-3. While pinout is identical (GND-OUT-VCC), the SOT23-3 body is larger and rated for higher power dissipation (320mW vs. 174mW). Using an SC70-3 variant would require selecting MAX6378XR44+, not MAX6378UR44+.
MAX6378UR44+ 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 Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6378UR44+ FAQ
1.How can I place an order for MAX6378UR44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6378UR44+ 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 MAX6378UR44+ reliable?
The price and inventory of MAX6378UR44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6378UR44+ is usually 5 days.
3.What payment methods are accepted for MAX6378UR44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6378UR44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6378UR44+?
MAX6378UR44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6378UR44+ 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 MAX6378UR44+?
For technical support, including MAX6378UR44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6378UR44+ requirements.
6.How does Aetrix verify that MAX6378UR44+ is sourced from the original manufacturer or authorized distributors?
All MAX6378UR44+ 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 MAX6378UR44+ meets industry standards.
7.What is the process for return or replacement of MAX6378UR44+?
All MAX6378UR44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6378UR44+, 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 MAX6378UR44+ part is unused and in its original packaging.
Return procedure for MAX6378UR44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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MIC826SYMT-TR
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