MCP7940NT-E/SN Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip MCP7940NT-E/SN is an automotive-grade real-time clock with 64 bytes of SRAM, I2C serial interface, interrupt output, and 32.768 kHz crystal oscillator support in an 8-pin SOIC package, providing accurate timekeeping for automotive, industrial control, and data logging systems across a wide temperature range.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP7940NT-E/SN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.1896(MOQ 10)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Automotive-grade timekeeping IC qualified for harsh temperature and reliability requirements
- 64 bytes on-chip SRAM for storing application data alongside time and date registers
- I2C serial interface with clock speeds up to 400 kHz for simple microcontroller integration
- Alarm interrupt output enabling wake-up or event-triggered processing in low-power systems
- 8-pin SOIC package with standard pinout compatible with common RTC footprints
Applications
MCP7940NT-E/SN is used in automotive telematics units, industrial data loggers, and smart meters where accurate timekeeping under wide temperature variations is required. It is well suited for event timestamping, scheduled wake-up control, and calendar-based automation in embedded systems that need reliable I2C RTC functionality with on-chip SRAM for persistent parameter storage.
Specifications
| Manufacturer Package Code | SOIC-8 |
| Factory Lead Time | 21Weeks |
| YTEOL | 14 |
| 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 | AEC-Q100 |
| 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 | AUTOMOTIVE |
| 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 MCP7940NT-E/SN:
Frequently Asked Questions
How much on-chip SRAM does MCP7940NT-E/SN provide, and how can embedded designs use it alongside the RTC registers?
MCP7940NT-E/SN includes 64 bytes of general-purpose SRAM accessible via I2C alongside the time, date, and alarm registers. Designers typically use this space to store calibration constants, device configuration flags, or the last-known system state, eliminating the need for an external EEPROM in applications with modest non-volatile storage requirements.
What I2C clock speed does MCP7940NT-E/SN support, and how does that affect polling frequency in a data logger design?
MCP7940NT-E/SN supports I2C communication at up to 400 kHz (fast-mode), enabling a microcontroller to read the full time and date registers in under 100 µs per transaction. For a data logger polling the RTC every second, this latency is negligible, allowing the host MCU to enter a low-power sleep state for nearly the entire 1-second interval and reducing average current consumption.
Is MCP7940NT-E/SN appropriate for automotive dashboard or telematics designs that face long procurement lead times?
MCP7940NT-E/SN carries automotive-grade qualification and an active lifecycle status, but its factory lead time of 21 weeks is notably longer than typical commercial RTC parts. Automotive program managers should include buffer stock and scheduled blanket orders in their supply chain plan to avoid production gaps, particularly for model-year-locked bill-of-materials designs.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 10+ | $0.7161 | $7.16 |
| 25+ | $0.6887 | $17.22 |
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