MCP7940M-I/SN Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip MCP7940M-I/SN is a real-time clock and calendar IC with 64 bytes of SRAM, I2C interface operating up to 400kHz, battery-backup support, and interrupt output, housed in an 8-pin SOIC package for up to 5.5V supply.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP7940M-I/SN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5400(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
- 64 bytes of on-chip SRAM provides non-volatile storage for user data alongside timekeeping registers
- I2C serial interface supports fast-mode 400kHz communication for easy microcontroller integration
- Interrupt output enables alarm and time-event notifications to wake a host processor from sleep modes
- Battery backup input maintains accurate timekeeping during main power loss in portable and embedded designs
- Full calendar functions including seconds, minutes, hours, day, date, month, and year with leap-year compensation
Applications
The MCP7940M-I/SN provides accurate real-time clock and calendar functions for embedded systems such as data loggers, industrial controllers, smart meters, and consumer electronics that require timestamping. Its I2C interface allows direct connection to microcontrollers like PIC, AVR, and ARM Cortex-M devices operating from 1.8V to 5.5V supply rails. The 64-byte SRAM and alarm interrupt output make it suitable for battery-backed scheduling and event-driven wake-up designs in low-power IoT nodes.
Specifications
| Manufacturer Package Code | SOIC-8 |
| Factory Lead Time | 6Weeks |
| YTEOL | 13 |
| Clock Frequency-Max | 0.032MHz |
| Information Access Method | SERIAL(I2C) |
| Interrupt Capability | Y |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| On Chip Data RAM Width | 8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.23 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| 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 | 1.27mm |
| Terminal Position | DUAL |
| Time-Min | SECONDS |
| Volatile | YES |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP7940M-I/SN:
Frequently Asked Questions
How much SRAM does the MCP7940M-I/SN provide for user data storage alongside the RTC registers?
The MCP7940M-I/SN includes 64 bytes of on-chip SRAM that can store calibration constants, configuration flags, or event logs. This dedicated user RAM is separate from the timekeeping registers, allowing applications to retain small data sets without needing an external EEPROM chip.
At what I2C clock speed can a host microcontroller communicate with the MCP7940M?
The MCP7940M supports I2C communication at up to 400kHz in fast mode, enabling quick register reads and writes within microseconds. This speed is more than sufficient for periodic timekeeping updates and alarm configuration in embedded systems running at megahertz clock rates.
How does the interrupt output of the MCP7940M-I/SN reduce power consumption in battery-operated designs?
The MCP7940M generates an interrupt signal when a programmed alarm time matches the current clock value, allowing the host microcontroller to remain in deep-sleep mode and reducing average supply current to microamperes. The host wakes only when the interrupt fires, significantly extending battery life in portable data loggers and IoT devices.
Which embedded platforms and supply voltages are compatible with the MCP7940M-I/SN?
The MCP7940M-I/SN operates from 1.8V to 5.5V, making it compatible with 3.3V ARM Cortex-M, 5V PIC, and 1.8V ultra-low-power MCU platforms. The 8-pin SOIC package fits standard footprints used in Arduino shields, industrial sensor boards, and custom embedded hardware across a wide range of voltage domains.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.6700 | $0.67 |
| 8+ | $0.6625 | $5.30 |
| 25+ | $0.6130 | $15.32 |
| 100+ | $0.5900 | $59.00 |
| 1000+ | $0.5600 | $560.00 |
| 5000+ | $0.5400 | $2700.00 |
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