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Analog Devices Inc./Maxim Integrated MAX6378XR37-T
- Part No.:
- MAX6378XR37-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6378XR37-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6378XR37-T from Maxim Integrated is an ultra-low-power, active-low voltage detector IC with a factory-trimmed 3.70V threshold, push-pull output, and SC70-3 package. It monitors VCC supply voltage and asserts logic-low OUT when VCC falls below 3.70V ±2.5%, operating reliably down to 1V supply and consuming only 500nA typical supply current. It is used in precision battery monitoring and power-supply supervision for portable medical devices and low-power IoT sensors.
For engineers reviewing the MAX6378XR37-T datasheet, MAX6378XR37-T pinout, MAX6378XR37-T application, or MAX6378XR37-T equivalent, this page delivers verified technical context, pin-level design meaning, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the exact part number.
Technical Context
The MAX6378XR37-T implements a precision bandgap reference and comparator with internally trimmed resistors to set its 3.70V detection threshold. Its push-pull output drives logic-low actively (no external pull-up required) and remains valid for VCC ≥1V. The device ignores fast transients via built-in immunity circuitry, with maximum tolerable negative-going glitch duration of ~120µs at 100mV overdrive.
It belongs to the MAX6375–MAX6380 family differentiated by threshold range (3.30V–4.63V), output type (push-pull vs. open-drain), and logic polarity (active-low). The "XR" suffix denotes SC70-3 packaging, and "R37" specifies the 3.70V nominal threshold with ±2.5% accuracy over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 3.70V ±2.5% over –40°C to +85°C - ensures reliable reset assertion across industrial temperature range without calibration. |
| Supply Current | 500nA typical at +25°C - enables multi-year battery life in coin-cell-powered systems like wearable health monitors. |
| Output Type | Active-low push-pull - directly interfaces with microcontroller reset inputs without external pull-up resistor or level-shifting. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during brown-out and deep-sleep states in mixed-voltage embedded systems. |
| Propagation Delay | 9.5µs typical (falling edge) - provides fast response to supply collapse while rejecting sub-microsecond noise. |
| Hysteresis | 100mV - prevents output oscillation near threshold during slow-ramping or noisy supply conditions. |
| Tempco | 40ppm/°C - maintains tight threshold stability across temperature, critical for precision battery end-of-life detection. |
Pinout & Package
MAX6378XR37-T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 = GND, Pin 2 = OUT, Pin 3 = 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 path for internal bandgap and comparator - must be connected to system ground plane with low-impedance trace. |
| 2 | OUT | Active-low push-pull output - sinks up to 1.6mA at VCC > 2.1V; drives microcontroller /RESET pin directly without external components. |
| 3 | VCC | Supply input - powers internal circuitry; accepts 1.2V–5.5V; decoupling capacitor (0.1µF) recommended within 2mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 500nA supply current | Extends shelf life and operational runtime in energy-harvesting and battery-backed systems where quiescent power dominates budget. |
| ±2.5% threshold accuracy over temperature | Eliminates need for system-level calibration or margining in safety-critical applications like implantable device power supervision. |
| Factory-trimmed 3.70V threshold | Reduces BOM count and assembly steps versus discrete resistor-divider + comparator solutions; guarantees performance without trimming. |
| Push-pull active-low output | Enables direct connection to standard CMOS /RESET inputs, avoiding pull-up resistor tolerance errors and board area overhead. |
| Transient immunity up to 120µs | Suppresses false resets caused by switching noise, ESD events, or DC/DC converter ripple without requiring external RC filtering. |
Applications
| Portable Medical Sensors | Lithium-Ion Battery Protection |
|---|---|
|
Use Scenario: A wearable ECG patch uses a CR2032 coin cell and shuts down when battery voltage drops below safe operating level. IC Role / Device Role / Timing Role: MAX6378XR37-T acts as primary undervoltage lockout (UVLO) supervisor, asserting /RESET to halt MCU operation before brownout-induced data corruption. Use Value: Its 3.70V threshold aligns precisely with Li-ion 3.7V nominal cell voltage end-of-discharge point, enabling accurate remaining capacity estimation. |
Use Scenario: A smart battery pack monitors cell voltage during discharge and triggers protection circuitry before over-discharge damage occurs. IC Role / Device Role / Timing Role: MAX6378XR37-T serves as standalone voltage monitor feeding into analog front-end comparator; no software dependency required. Use Value: 500nA quiescent current minimizes self-discharge during long-term storage, preserving charge for up to 10 years in shelf mode. |
| Industrial Wireless Sensor Nodes | Low-Power Microcontroller Supervision |
|
Use Scenario: A LoRaWAN soil moisture sensor operates on AA batteries and sleeps for 15 minutes between transmissions. IC Role / Device Role / Timing Role: MAX6378XR37-T supervises the main 3.3V LDO output, ensuring clean wake-up after cold start or voltage sag from RF transmission surge. Use Value: 9.5µs propagation delay and 100mV hysteresis prevent spurious resets during transient load spikes from RF power amplifier turn-on. |
Use Scenario: An ARM Cortex-M0+ microcontroller requires guaranteed reset assertion until stable 3.3V rail is established post-power-on. IC Role / Device Role / Timing Role: MAX6378XR37-T replaces RC-based reset circuits, delivering deterministic, temperature-stable reset timing independent of capacitor aging. Use Value: ±2.5% threshold accuracy eliminates need for derating or guard-banding in automotive-grade industrial control firmware validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage detector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB37DBZR | 3.7V threshold, open-drain output, 350nA supply current, SOT23-3 package | Requires external pull-up resistor; lower ICC but lacks push-pull drive strength for direct MCU reset | Prefer when system already uses open-drain bus architecture or needs lowest possible ICC |
| APX803S-37SA-7 | 3.7V threshold, push-pull output, 1.1µA supply current, SOT23-3 package | Higher supply current than MAX6378XR37-T; same pinout but different marking and thermal characteristics | Choose when SC70 footprint is not required and higher ICC is acceptable for cost-sensitive volume production |
Compared with TLV803EB37DBZR and APX803S-37SA-7, the MAX6378XR37-T uniquely combines SC70-3 miniaturization, 500nA ultra-low ICC, and active-low push-pull output - making it optimal for space- and energy-constrained designs where direct reset drive and minimal board area are mandatory.
Availability
MAX6378XR37-T is available at Aetrix Electronics and suitable for portable medical sensors, lithium-ion battery protection circuits, and industrial wireless sensor nodes requiring stable component supply, long-lifecycle support, and consistent lead-free compliance.
Supply support for MAX6378XR37-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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration.
The MAX6375–MAX6380 series was developed specifically for ultra-low-power voltage supervision in battery-operated and energy-sensitive systems, prioritizing nanoscale quiescent current and factory-trimmed precision over programmability or feature richness.
FAQ
What is the exact threshold voltage and accuracy of the MAX6378XR37-T?
The MAX6378XR37-T has a nominal threshold voltage of 3.70V with ±2.5% accuracy over the full industrial temperature range (–40°C to +85°C). This specification is guaranteed by design and confirmed in Maxim's Electrical Characteristics table, where min/max limits are 3.607V and 3.792V at temperature extremes. The "R37" suffix explicitly denotes this 3.70V trim.
Does the MAX6378XR37-T require an external pull-up resistor on its OUT pin?
No, the MAX6378XR37-T features an active-low push-pull output, meaning it actively drives OUT low when VCC falls below threshold and high-impedance (not driven) otherwise - but unlike open-drain variants, it does not require an external pull-up. Its push-pull structure allows direct connection to standard CMOS /RESET inputs without additional components.
What package type and dimensions does the MAX6378XR37-T use?
The MAX6378XR37-T uses the SC70-3 package: 2.0mm × 2.1mm × 0.95mm body size with 0.65mm pin pitch. Pin 1 is GND, Pin 2 is OUT, and Pin 3 is VCC. This compact outline is defined in Maxim's Package Information section and matches JEDEC MO-203AB standards for automated assembly.
Can the MAX6378XR37-T operate reliably below 2.0V supply voltage?
Yes, the MAX6378XR37-T is fully specified to operate down to 1.2V VCC and guarantees correct output logic state (active-low OUT) for VCC as low as 1.0V. This capability is explicitly stated in the General Description and validated in Absolute Maximum Ratings, enabling use in deep brown-out and ultra-low-voltage battery scenarios.
How does the MAX6378XR37-T handle power supply transients?
The MAX6378XR37-T incorporates internal transient immunity circuitry that rejects fast negative-going VCC glitches. Per the Typical Operating Characteristics graph "Maximum Transient Duration vs. Threshold Overdrive", it tolerates a 100mV overdrive (i.e., VCC = 3.60V) for up to ~120µs without asserting OUT - preventing false resets during switching noise or load transients.
MAX6378XR37-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.7V
- 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
MAX6378XR37-T FAQ
1.How can I place an order for MAX6378XR37-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6378XR37-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 MAX6378XR37-T reliable?
The price and inventory of MAX6378XR37-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6378XR37-T is usually 5 days.
3.What payment methods are accepted for MAX6378XR37-T?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6378XR37-T?
MAX6378XR37-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6378XR37-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 MAX6378XR37-T?
For technical support, including MAX6378XR37-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6378XR37-T requirements.
6.How does Aetrix verify that MAX6378XR37-T is sourced from the original manufacturer or authorized distributors?
All MAX6378XR37-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 MAX6378XR37-T meets industry standards.
7.What is the process for return or replacement of MAX6378XR37-T?
All MAX6378XR37-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6378XR37-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 MAX6378XR37-T part is unused and in its original packaging.
Return procedure for MAX6378XR37-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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