MCP79412-I/MS Microchip Integrated Circuit (Small Outline Packages) In Stock
The MCP79412-I/MS is an I2C real-time clock with battery switchover, 64 bytes EEPROM, and a unique ID, operating from 1.8 V to 5.5 V in an 8-pin MSOP package with 32.768 kHz crystal interface. From $0.95 in stock worldwide shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP79412-I/MS Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.8920(MOQ 10)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of MCP79412-I/MS?
- Full BCD real-time clock with seconds through year registers plus automatic leap-year compensation over I2C at 100 kHz or 400 kHz
- Integrated 64-byte EEPROM and 8-byte protected register block plus factory-programmed 64-bit unique MAC-compatible identifier
- Battery switchover circuit with power-fail timestamp enabling uninterrupted timekeeping from 1.8 V to 5.5 V supply range
What is MCP79412-I/MS used for?
The MCP79412-I/MS is used in industrial data loggers, smart metering systems, and IoT gateways where accurate timestamping and event recording with a factory-unique ID are required. Its integrated EEPROM and unique 64-bit identifier simplify manufacturing by eliminating the need for separate memory and UUID generation chips. Low-voltage operation down to 1.8 V and battery switchover make it well suited for portable medical monitors and always-on embedded systems that must maintain timekeeping during main power outages.
What are the specifications of MCP79412-I/MS?
| Manufacturer Package Code | MSOP-8 |
| Factory Lead Time | 11Weeks |
| YTEOL | 13 |
| Additional Feature | ALSO OPERATES AT 100KHZ WITH 1.8 V NOMINAL |
| 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 |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| RAM (words) | 64 |
| Screening Level | TS 16949 |
| Supply Current-Max | 3mA |
| 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 |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Volatile | NO |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
| ## MCP79412-I/MS Alternates Showing results | Image |
| 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 |
Where can I find the MCP79412-I/MS datasheet?
MCP79412-I/MS Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP79412-I/MS?
Compatible alternatives and drop-in replacements for MCP79412-I/MS:
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Frequently Asked Questions
What supply voltage range does MCP79412-I/MS support and can it operate from a 3 V coin cell during backup?
The MCP79412-I/MS operates from 1.8 V to 5.5 V on its primary supply and includes a battery switchover circuit that automatically switches to a backup VBAT pin—typically a 3 V CR2032 coin cell—when primary power is lost, ensuring uninterrupted RTC operation and preserving all 64-byte EEPROM contents.
How does the factory-programmed 64-bit unique identifier in MCP79412-I/MS simplify device provisioning?
Each MCP79412-I/MS ships with a factory-written 64-bit EUI-64-compatible unique identifier that cannot be overwritten, eliminating the need for a separate UUID generation step during PCB assembly. This built-in ID is readable via I2C and can serve as a node address in network protocols such as 1-Wire, CAN, or custom IoT stacks, saving both BOM cost and programming time.
What I2C speed modes does MCP79412-I/MS support, and is it compatible with 1.8 V microcontroller I/O?
The device supports both standard 100 kHz and fast 400 kHz I2C modes and operates down to 1.8 V nominal, making its I/O levels directly compatible with low-voltage MCUs such as STM32L0 or MSP430 without level-shifting hardware. At 1.8 V the 32.768 kHz oscillator continues timekeeping with typical accuracy within ±2 ppm across the -40°C to +85°C temperature range.
How much non-volatile storage does MCP79412-I/MS provide for application data alongside the timekeeping registers?
The MCP79412-I/MS includes 64 bytes of general-purpose EEPROM accessible via I2C in addition to the RTC time and alarm registers. An 8-byte protected register block within the EEPROM array can be write-protected by software, making it suitable for storing calibration constants or factory configuration values that must survive field firmware updates.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 10+ | $1.7100 | $17.10 |
| 25+ | $1.0800 | $27.00 |
| 100+ | $1.0300 | $103.00 |
| 1000+ | $0.9700 | $970.00 |
| 5000+ | $0.8950 | $4475.00 |
| 7500+ | $0.8920 | $6690.00 |
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