MCP7940MT-I/MNY Microchip Integrated Circuit (Small Outline No-lead) In Stock
Microchip MCP7940MT-I/MNY is a real-time clock and calendar IC with 64-byte battery-backed SRAM, I2C serial interface, and interrupt capability in an 8-pin TDFN package. Operating at a 32.768 kHz crystal frequency, it delivers reliable timekeeping for industrial meters, data loggers, and IoT edge devices.
- Manufacturer
- Microchip
- Package
- Small Outline No-lead
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP7940MT-I/MNY Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4760(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
- Real-time clock and calendar with seconds, minutes, hours, day, date, month, and year registers
- 64 bytes of non-volatile SRAM for storing timestamps and configuration data across power cycles
- I2C serial interface operating up to 400 kHz for direct MCU integration
- Interrupt output for alarm-based wake-up in low-power battery-backed systems
- Compact 8-pin TDFN package reducing PCB footprint versus SOIC alternatives
- 32.768 kHz crystal oscillator circuit with integrated capacitors
Applications
The MCP7940MT-I/MNY is commonly used in industrial data loggers, smart meters, and embedded IoT gateways that require accurate timekeeping independent of the main power supply. Its I2C interface and 64-byte SRAM also make it popular in alarm clocks, access control panels, and medical monitoring devices that store timestamps alongside device configuration data.
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 | 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 | 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 | Small Outline No-lead |
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
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How much non-volatile SRAM does MCP7940MT-I/MNY provide, and what data can be stored across power cycles?
MCP7940MT-I/MNY includes 64 bytes of battery-backed SRAM, which is sufficient to store configuration registers, calibration offsets, event timestamps, and device ID strings that must persist through power-off cycles in data loggers and smart meters.
How does the interrupt output on MCP7940MT-I/MNY enable low-power alarm-based wake-up designs?
The interrupt output can be programmed to assert at a specific time or date alarm match, waking a low-power MCU from sleep mode. This allows the host processor to remain in deep sleep for extended periods, reducing system current consumption to the microamp range between scheduled wake events.
What I2C speed does MCP7940MT-I/MNY support, and is it compatible with standard microcontroller I2C peripherals?
The device uses I2C serial interface with standard and fast mode support up to 400 kHz, making it directly compatible with I2C peripherals on virtually all modern 8-bit and 32-bit microcontrollers including PIC, AVR, ARM Cortex-M, and MSP430 families without additional level shifting.
What is the factory lead time for MCP7940MT-I/MNY, and how long is it expected to remain in active production?
Factory lead time is approximately 6 weeks, and with a YTEOL of 13 years, the part is expected to remain in active production well into the future. This long lifecycle makes MCP7940MT-I/MNY a reliable choice for industrial and infrastructure designs requiring 10-year or longer service periods.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.5000 | $1.50 |
| 4+ | $1.2500 | $5.00 |
| 13+ | $0.9000 | $11.70 |
| 100+ | $0.6700 | $67.00 |
| 1000+ | $0.4840 | $484.00 |
| 3000+ | $0.4760 | $1428.00 |
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