MCP7940N-I/MS Microchip Undefined or Miscellaneous (Small Outline Packages) In Stock
MCP7940N-I/MS is a low-power I2C real-time clock/calendar with 64 bytes of SRAM, battery switchover, and alarm outputs, housed in an 8-pin MSOP package. It operates from 1.8 V to 5.5 V at up to 400 kHz, making it ideal for embedded systems requiring accurate timekeeping with minimal board space.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP7940N-I/MS Datasheet PDF
- Category
- Undefined or Miscellaneous
- Price
- From $0.7750(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- I2C interface up to 400 kHz for easy integration
- Operating voltage 1.8 V to 5.5 V wide range
- 64 bytes battery-backed SRAM for user data retention
- Two alarm outputs with configurable interrupt modes
- Battery switchover circuitry for uninterrupted timekeeping
- 8-pin MSOP package for compact PCB layouts
Applications
The MCP7940N-I/MS is widely used in industrial and consumer equipment where accurate timekeeping is critical, such as data loggers, smart meters, and HVAC controllers. Its I2C interface and low-voltage operation make it suitable for microcontroller-based systems with tight power budgets. The device also fits into portable medical instruments and IoT gateways that require reliable clock and calendar functions with minimal power draw.
Specifications
| Manufacturer Package Code | MSOP-8 |
| Factory Lead Time | 12Weeks |
| YTEOL | 13 |
| Clock Frequency-Max | 0.032MHz |
| Information Access Method | SERIAL(I2C) |
| Interrupt Capability | Y |
| JESD-30 Code | S-PDSO-G8 |
| JESD-609 Code | e3 |
| On Chip Data RAM Width | 8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.19 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE |
| Qualification Status | Not Qualified |
| RAM (words) | 64 |
| Screening Level | TS 16949 |
| Supply Current-Max | 0.4mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 2.5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time-Min | SECONDS |
| Volatile | YES |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
| ## MCP7940N-I/MS Alternates Showing results | Image |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP7940N-I/MS:
Frequently Asked Questions
What is the operating voltage range of the MCP7940N-I/MS and how does it affect battery backup design?
The MCP7940N-I/MS operates from 1.8 V to 5.5 V, and its internal battery switchover circuit automatically switches to a backup supply when the main power drops below the switchover voltage threshold, ensuring the 64-byte SRAM and clock registers retain data without interruption.
How fast is the I2C bus supported by MCP7940N-I/MS for real-time communication?
The MCP7940N-I/MS supports I2C clock speeds up to 400 kHz in Fast mode, enabling rapid read/write cycles for timekeeping registers and the 64-byte SRAM within a standard 8-pin MSOP footprint.
Which embedded applications benefit most from the MCP7940N-I/MS alarm output feature?
Industrial data loggers, smart energy meters, and HVAC schedulers benefit from the MCP7940N-I/MS dual alarm outputs, which can trigger interrupts at specific calendar times or repeating intervals, reducing host CPU polling overhead in systems running at 3.3 V or 5 V.
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