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Analog Devices Inc./Maxim Integrated MAX6378XR44
- Part No.:
- MAX6378XR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6378XR44.pdf
- Description:
- IC SUPERVISOR UL LO PWR VOLT DET
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
MAX6378XR44 from Maxim Integrated is an ultra-low-power, active-low voltage detector in SC70-3 package with factory-trimmed 4.38V threshold, ±2.5% accuracy over temperature, 500nA supply current, and push-pull output. It monitors VCC in battery-powered systems and asserts OUT low when supply drops below threshold-used in precision brownout detection for microcontroller reset circuits.
For engineers reviewing the MAX6378XR44 datasheet, MAX6378XR44 pinout, MAX6378XR44 application, or MAX6378XR44 equivalent, this device supports critical power-fail detection in portable equipment where supply current <1µA, threshold stability across -40°C to +85°C, and transient-immune operation are mandatory design requirements.
Technical Context
The MAX6378XR44 integrates a precision bandgap reference, comparator, and laser-trimmed resistive divider to set its 4.38V detection threshold without external components. Its internal hysteresis of 9.5mV prevents chatter during slow VCC decay.
It features push-pull active-low output logic (OUT = low when VCC < VTH), guaranteed functional down to 1V VCC, and immunity to transients ≤200µs at 100mV overdrive-enabling reliable reset assertion in noisy DC/DC converter outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 4.38V nominal, ±2.5% over -40°C to +85°C - ensures accurate brownout detection across industrial temperature range |
| Supply Current | 500nA typical - enables multi-year battery life in coin-cell–powered IoT sensors and wearables |
| Output Type | Active-low push-pull - drives MCU RESET pin directly without pull-up resistor, reducing BOM count |
| Propagation Delay | 9.5µs typical (falling edge) - fast enough for sub-millisecond system recovery after power restoration |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and compatibility with 3.3V/5V systems |
| Hysteresis | 9.5mV - suppresses false triggering on slow-ramping or noisy supply rails |
| Tempco | 40ppm/°C - contributes to tight threshold stability over full temperature range |
Pinout & Package
MAX6378XR44 is housed in a 3-pin SC70-3 package (1.25mm × 2.0mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 is GND, Pin 2 is OUT, Pin 3 is VCC - compatible with automated SMT placement and reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return for internal bandgap and comparator - must be low-impedance connection to system ground plane |
| 2 | OUT | Active-low push-pull output - sinks up to 1.2mA or sources 500µA; directly interfaces with standard CMOS RESET inputs |
| 3 | VCC | Supply input - powers internal circuitry; operates from 1.2V to 5.5V and remains functional down to 1V for fail-safe state retention |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 500nA supply current | Extends battery service life in always-on monitoring applications such as medical patches and remote sensors |
| Factory-trimmed 4.38V threshold | Eliminates external resistor network and calibration steps - reduces design cycle time and production test complexity |
| ±2.5% threshold accuracy over temperature | Guarantees consistent reset point across environmental stress without derating or margining |
| Power-supply transient immunity | Rejects glitches ≤200µs duration at 100mV overdrive - prevents spurious resets during switching regulator noise events |
| No external components required | Reduces PCB area by >0.5mm² and eliminates component sourcing, qualification, and solder joint reliability risks |
Applications
| Battery-Powered Microcontroller Reset | DC/DC Converter Output Monitoring |
|---|---|
|
Use Scenario: Coin-cell–powered BLE sensor node operating at 3.0V nominal, requiring reliable reset if battery voltage falls below 4.38V due to aging or cold-temperature derating. IC Role / Device Role / Timing Role: Voltage detector providing active-low reset signal to microcontroller's nRST pin upon undervoltage condition. Use Value: Prevents firmware corruption by ensuring processor halts before supply drops below minimum operating voltage of internal flash and SRAM. |
Use Scenario: 5V-output buck converter powering FPGA I/O banks; output must be monitored for dropout during load transients or input sag. IC Role / Device Role / Timing Role: Standalone brownout detector asserting reset to FPGA configuration controller when VOUT dips below 4.38V. Use Value: Enables safe reconfiguration sequence before core logic enters undefined state - avoids bitstream corruption or latch-up risk. |
| Portable Medical Device Power Supervision | Industrial Sensor Node Undervoltage Lockout |
|
Use Scenario: Handheld glucose meter using alkaline AA batteries; requires precise 4.38V cutoff to preserve display contrast and ADC accuracy until end-of-life. IC Role / Device Role / Timing Role: Primary supply monitor feeding enable signal to LCD bias generator and analog front-end. Use Value: Ensures consistent measurement fidelity by disabling analog subsystems before supply droop degrades reference stability or gain linearity. |
Use Scenario: LoRaWAN soil moisture sensor deployed outdoors, powered by solar-charged LiFePO₄ (3.6V nominal); needs robust reset at 4.38V to handle charging overshoot and thermal drift. IC Role / Device Role / Timing Role: High-threshold supervisor enabling MCU only when battery is sufficiently charged above safe operating window. Use Value: Prevents premature wake-up and radio transmission attempts during marginal charge states - conserves energy and extends field lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB33DBVR | 3.3V threshold, SOT23-3, 350nA supply current, open-drain output | Requires external pull-up; lower threshold unsuitable for 4.38V monitoring | Select only if system uses 3.3V rail supervision and open-drain bus sharing is required |
| TPS3808G33DBVR | 3.3V threshold, SOT23-6, 800nA supply current, adjustable delay, push-pull | Higher quiescent current and different pinout; not drop-in for SC70-3 footprint | Choose when programmable reset timeout is needed and board layout allows SOT23-6 |
Compared with TLV803EB33DBVR and TPS3808G33DBVR, the MAX6378XR44 provides exact 4.38V detection in SC70-3 with push-pull drive and lowest supply current-making it uniquely suited for compact, long-life 4.3V+ battery monitoring without external components.
Availability
MAX6378XR44 is available at Aetrix Electronics and suitable for battery-powered microcontroller reset, DC/DC converter output monitoring, and portable medical device power supervision requiring stable component supply, lead-free compliance, and tape-and-reel delivery.
Supply support for MAX6378XR44 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, mixed-signal, and power management ICs for high-reliability industrial, automotive, and computing applications.
The MAX6375–MAX6380 family delivers ultra-low-power voltage detection for battery and power-supply monitoring-engineered specifically for portable, energy-harvesting, and always-on embedded systems where nanoscale current and factory-trimmed accuracy are critical.
FAQ
What is the exact factory-trimmed threshold voltage of MAX6378XR44?
The MAX6378XR44 has a nominal threshold voltage of 4.38V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed at wafer sort and verified per Maxim's production test flow - no external adjustment is needed. The "R44" suffix in MAX6378XR44 explicitly denotes the 4.38V variant per Table 1 of the datasheet.
Does MAX6378XR44 support operation below 1.2V VCC?
Yes - the MAX6378XR44 guarantees correct output logic state (active-low assertion) for VCC down to 1V, though its specified operating range begins at 1.2V. Below 1.2V, the device remains functional but parameters like propagation delay and output drive strength are not characterized. For brownout detection in deeply discharged battery scenarios, MAX6378XR44 maintains valid reset signaling even at 1.0V VCC.
Can MAX6378XR44 replace MAX6378UR44 in an existing design?
Yes - MAX6378XR44 and MAX6378UR44 share identical electrical specifications, threshold voltage (4.38V), and output behavior. The only difference is package: XR denotes SC70-3, UR denotes SOT23-3. Both are pin-compatible (GND-OUT-VCC pinout), but footprint and thermal characteristics differ. Layout change is required unless both packages were designed into the same land pattern.
What is the maximum transient duration MAX6378XR44 can ignore at 100mV overdrive?
At 100mV overdrive (i.e., VCC = VTH − 100mV = 4.28V), the MAX6378XR44 rejects transients up to 200µs in duration, as shown in Figure MAX6375-04 of the datasheet. This immunity prevents false resets during brief supply sags caused by switching regulator ripple or load-step events - a key requirement for stable operation in DC/DC-powered systems.
Is MAX6378XR44 available in lead-free packaging?
Yes - MAX6378XR44 is offered in RoHS-compliant, lead-free packaging. To order the lead-free version, replace the "-T" suffix with "+T" (e.g., MAX6378XR44+T). The SC70-3 package meets JEDEC J-STD-020 moisture sensitivity level 1 and is compatible with standard Pb-free reflow profiles.
MAX6378XR44 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 Low
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6378XR44 FAQ
1.How can I place an order for MAX6378XR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6378XR44 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 MAX6378XR44 reliable?
The price and inventory of MAX6378XR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6378XR44 is usually 5 days.
3.What payment methods are accepted for MAX6378XR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6378XR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6378XR44?
MAX6378XR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6378XR44 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 MAX6378XR44?
For technical support, including MAX6378XR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6378XR44 requirements.
6.How does Aetrix verify that MAX6378XR44 is sourced from the original manufacturer or authorized distributors?
All MAX6378XR44 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 MAX6378XR44 meets industry standards.
7.What is the process for return or replacement of MAX6378XR44?
All MAX6378XR44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6378XR44, 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 MAX6378XR44 part is unused and in its original packaging.
Return procedure for MAX6378XR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6378XR44 Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
Microchip Technology
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MCP120T-315I/TT
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MCP809T-315I/TT
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