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Analog Devices Inc./Maxim Integrated MAX6378UR44+T
- Part No.:
- MAX6378UR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6378UR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:733
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Product details
Overview
MAX6378UR44+T from Maxim Integrated is an ultra-low-power, active-low push-pull voltage detector optimized for 4.38V threshold monitoring in battery-powered systems. It features 500nA supply current, ±2.5% threshold accuracy over -40°C to +85°C, and operates down to 1V VCC. Its primary role is system reset assertion during brownout conditions in portable medical devices and low-power IoT sensors.
For engineers reviewing the MAX6378UR44+T datasheet, MAX6378UR44+T pinout, MAX6378UR44+T application, or MAX6378UR44+T equivalent, key selection criteria include factory-trimmed 4.38V threshold, SOT23-3 package compatibility, push-pull output drive capability, transient immunity up to 100µs at 200mV overdrive, and guaranteed logic state retention down to 1V supply.
Technical Context
The MAX6378UR44+T implements a precision bandgap reference and comparator with internally trimmed resistors to deliver a fixed 4.38V detection threshold. It asserts an active-low push-pull output (OUT) when VCC falls below VTH, maintaining valid logic state down to 1V supply voltage.
Designed for immunity to fast transients, it tolerates negative-going VCC glitches up to 100µs duration at 200mV overdrive (VTH − VCC), with propagation delay of 9.5µs (typical) and 40ppm/°C temperature coefficient on threshold voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (factory-trimmed, ±2.5% over -40°C to +85°C) |
| Supply Current | 500nA (enables >10-year battery life in coin-cell applications) |
| Output Type | Active-low push-pull (drives high/low without external pull-up) |
| VCC Operating Range | 1.2V to 5.5V (guaranteed output state down to 1V) |
| Propagation Delay | 9.5µs (typical falling edge; ensures timely reset assertion) |
| Threshold Hysteresis | 100mV (prevents chatter during slow VCC recovery) |
| Tempco | 40ppm/°C (stable trip point across industrial temperature range) |
Pinout & Package
MAX6378UR44+T is housed in a 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 ≥1.6mA / sources ≥500µA; directly interfaces with µP reset inputs without pull-up resistor |
| 3 | VCC | Supply input (1.2V–5.5V); powers internal circuitry and defines detection domain; decoupling capacitor recommended |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Factory-trimmed threshold and hysteresis eliminate calibration resistors and reduce BOM count |
| Ultra-low 500nA quiescent current | Extends shelf life and operational runtime in energy-constrained designs like wearable sensors |
| 1V minimum VCC operation | Ensures reliable reset assertion even during deep battery discharge or cold-start conditions |
| Transient immunity | Rejects VCC glitches ≤100µs at 200mV overdrive-critical for noisy DC/DC converter outputs |
| Push-pull output architecture | Eliminates need for external pull-up resistor, reducing layout area and leakage path uncertainty |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell operating 5+ years between replacements. IC Role / Device Role / Timing Role: Voltage detector asserting microcontroller reset when battery drops below 4.38V to prevent data corruption during low-voltage write cycles. Use Value: 500nA supply current extends usable battery life by >18 months versus comparable 1µA detectors; push-pull output eliminates pull-up leakage that would otherwise drain standby current. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 15 minutes using Li-SOCl₂ primary battery. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown before EEPROM write failure due to insufficient VCC margin. Use Value: Guaranteed 1V operation ensures reset remains asserted until battery reaches end-of-life; ±2.5% threshold accuracy prevents premature shutdown at 4.28V. |
| Smart Meter Battery Backup | Low-Power Wireless Modules |
|
Use Scenario: Electricity meter retaining time/date and tariff data during AC mains failure using supercapacitor backup. IC Role / Device Role / Timing Role: Supervisory circuit monitoring supercapacitor voltage to initiate nonvolatile memory save before voltage collapses below safe write level. Use Value: 9.5µs propagation delay enables capture of final valid measurement before power loss; 100mV hysteresis prevents oscillation during slow capacitor discharge. |
Use Scenario: BLE beacon transmitting asset location every 2 seconds using AA alkaline cells. IC Role / Device Role / Timing Role: System supervisor detecting battery sag during RF transmit bursts and holding MCU in reset until voltage recovers above 4.38V. Use Value: Transient immunity rejects 50µs VCC dips caused by PA switching noise; SOT23-3 footprint allows placement adjacent to battery connector with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB33DBZR | 3.3V threshold, 350nA supply current, open-drain output, SOT23-3 | Requires external pull-up; lower threshold unsuitable for 4.38V Li-ion monitoring | Select only if system uses 3.3V rail monitoring and can accommodate pull-up resistor |
| TPS3808G33DBVR | 3.3V threshold, 800nA supply current, push-pull output, SOT23-6 | Larger 6-pin package; higher quiescent current reduces battery life by ~60% | Choose only if design requires adjustable delay or watchdog functionality not present in MAX6378UR44+T |
Compared with TLV803EB33DBZR and TPS3808G33DBVR, the MAX6378UR44+T uniquely delivers 4.38V precision detection in SOT23-3 with 500nA current and push-pull drive-enabling direct replacement in space-constrained, long-life 4.2–4.4V battery monitoring without layout or BOM changes.
Availability
MAX6378UR44+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and smart meter battery backup systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6378UR44+T 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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6375–MAX6380 family was engineered specifically for ultra-low-power voltage supervision in battery-critical systems, emphasizing nanoscale quiescent current, factory-trimmed thresholds, and robust transient rejection in miniature packages.
FAQ
What is the exact factory-trimmed threshold voltage of MAX6378UR44+T?
The MAX6378UR44+T has a nominal reset threshold of 4.38V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is laser-trimmed at wafer test and confirmed in Table 1 of the datasheet under suffix "R44". The MAX6378UR44+T is part of the 3.30V–4.63V threshold group within the MAX6378/MAX6379/MAX6380 series.
Does MAX6378UR44+T require an external pull-up resistor on its OUT pin?
No, the MAX6378UR44+T features an active-low push-pull output, meaning it actively drives both high and low states without needing an external pull-up resistor. This distinguishes it from open-drain variants like MAX6377/MAX6380 and reduces standby current leakage paths-making the MAX6378UR44+T ideal for ultra-low-power designs where every nanoamp counts.
What is the minimum VCC voltage at which MAX6378UR44+T guarantees correct output logic state?
The MAX6378UR44+T guarantees correct output logic state (i.e., OUT remains low when VCC < VTH and high when VCC > VTH) down to 1V VCC. This specification is explicitly stated in the General Description and Electrical Characteristics sections, enabling reliable operation during deep battery discharge or cold-start scenarios where other supervisors fail.
How does MAX6378UR44+T handle short voltage transients on the VCC line?
The MAX6378UR44+T is designed to ignore fast negative-going VCC transients: it tolerates glitches up to 100µs wide when the overdrive (VTH − VCC) is 200mV, as shown in Figure MAX6375-04. This transient immunity prevents false resets caused by switching noise from DC/DC converters or RF transceivers-ensuring robust operation in electrically noisy environments where the MAX6378UR44+T is deployed.
Is MAX6378UR44+T available in lead-free packaging, and how is it ordered?
Yes, MAX6378UR44+T is lead-free compliant. The "+T" suffix in the part number explicitly denotes lead-free packaging per JEDEC J-STD-609. This replaces the legacy "-T" leaded version. Ordering requires tape-and-reel packaging only, with standard order increments of 2,500 pieces for this R44 threshold variant, as specified in Table 2 of the datasheet.
MAX6378UR44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6378UR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6378UR44+T 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+T reliable?
The price and inventory of MAX6378UR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6378UR44+T is usually 5 days.
3.What payment methods are accepted for MAX6378UR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6378UR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6378UR44+T?
MAX6378UR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6378UR44+T 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+T?
For technical support, including MAX6378UR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6378UR44+T requirements.
6.How does Aetrix verify that MAX6378UR44+T is sourced from the original manufacturer or authorized distributors?
All MAX6378UR44+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6378UR44+T?
All MAX6378UR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6378UR44+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6378UR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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