MCP7940NT-I/MNY Microchip Real-Time Clock (TDFN-8) In Stock
MCP7940NT-I/MNY is a low-power real-time clock (RTC) IC from Microchip with I2C serial interface, 64 bytes of battery-backed SRAM, and operating supply of 1.8 V to 5.5 V for accurate timekeeping in embedded systems.
- Manufacturer
- Microchip
- Package
- TDFN-8
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP7940NT-I/MNY Datasheet PDF
- Category
- Real-Time Clock
- Price
- From $0.7700(MOQ 25)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- I2C serial interface operating up to 400 kHz for easy microcontroller integration
- 64 bytes of battery-backed SRAM for non-volatile data retention
- Operating supply voltage range of 1.8 V to 5.5 V
- On-chip crystal oscillator requires no external tuning capacitors
- Configurable alarm outputs with interrupt capability
- Low timekeeping current of typically 1.2 µA at 3.3 V
- TDFN-8 package for space-constrained board designs
Applications
The MCP7940NT-I/MNY is commonly used in portable consumer electronics, industrial monitoring equipment, and smart metering systems where accurate timekeeping with minimal power consumption is essential. It is well suited for data loggers, HVAC controllers, and IoT edge nodes that require time-stamped events stored in battery-backed SRAM. Its wide supply voltage range makes it compatible with both 3.3 V and 5 V microcontroller platforms.
Specifications
| Manufacturer Package Code | TDFN-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-N8 |
| JESD-609 Code | e4 |
| On Chip Data RAM Width | 8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOLCC8,.11,20 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE |
| 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 | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | DUAL |
| Time-Min | SECONDS |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Volatile | YES |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
| Package | TDFN-8 |
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-I/MNY:
Frequently Asked Questions
How does the MCP7940NT-I/MNY maintain time accuracy when the main power supply is removed?
The MCP7940NT-I/MNY includes 64 bytes of battery-backed SRAM and a dedicated VBAT pin that keeps the oscillator and registers powered from a coin cell down to 1.3 V, preserving timekeeping accuracy across power outages.
What I2C clock speeds does the MCP7940NT-I/MNY support for firmware integration?
The device supports Standard mode at 100 kHz and Fast mode at 400 kHz on the I2C bus, making it compatible with most 8-bit and 32-bit microcontrollers without requiring additional bus buffers or clock stretching.
Which supply voltage rail options are compatible with the MCP7940NT-I/MNY for mixed-voltage systems?
The MCP7940NT-I/MNY operates across a 1.8 V to 5.5 V supply range, allowing direct connection to both 3.3 V ARM-based MCUs and 5 V AVR platforms in a single design without level-shifting the power rail.
What is the lead time and package format buyers should expect for MCP7940NT-I/MNY procurement?
Typical factory lead time is 6 weeks. The part ships in a compact TDFN-8 package with an 8-pin no-lead footprint, suitable for automated SMT reflow assembly with fine-pitch pick-and-place equipment.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 25+ | $0.9610 | $24.02 |
| 50+ | $0.9340 | $46.70 |
| 100+ | $0.8300 | $83.00 |
| 1000+ | $0.7900 | $790.00 |
| 5000+ | $0.7700 | $3850.00 |
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