MCP79410-I/ST Microchip Integrated Circuit (Small Outline Packages) In Stock
The MCP79410-I/ST is a real-time clock IC with I2C interface, 32.768 kHz oscillator, and 64-byte SRAM for battery-backed timekeeping in embedded systems. It operates from 1.8V nominal with I2C speeds up to 400 kHz (100 kHz at 1.8V) and supports interrupt output for alarm events. Housed in an 8-pin TSSOP package for compact timekeeping designs in consumer and industrial electronics.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP79410-I/ST Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.8700(MOQ 1)
- 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 MCP79410-I/ST?
- Real-time clock with 32.768 kHz crystal oscillator for accurate timekeeping
- I2C serial interface at up to 400 kHz for easy microcontroller connectivity
- 64-byte on-chip SRAM for user data and configuration storage
- 1.8V nominal operation enabling direct interface with low-voltage MCU systems
- Interrupt output for alarm and timer event signaling
- 8-pin TSSOP package with 2-week typical lead time for rapid prototyping
- Battery switchover for uninterrupted timekeeping during power outages
What is MCP79410-I/ST used for?
The MCP79410-I/ST is used in battery-backed real-time clock applications for data loggers, industrial controllers, and consumer electronics that need accurate time-of-day and calendar tracking through power interruptions. Its I2C interface simplifies integration with virtually any microcontroller, and the 64-byte SRAM can store configuration or event timestamps directly on the RTC. The device is also suited for alarm-triggered wake-up systems in low-power IoT nodes where the interrupt output wakes the main MCU from deep sleep at programmed intervals.
What are the specifications of MCP79410-I/ST?
| Manufacturer Package Code | TSSOP-8 |
| Factory Lead Time | 2Weeks |
| YTEOL | 9 |
| 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 | R-PDSO-G8 |
| JESD-609 Code | e3 |
| On Chip Data RAM Width | 8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| 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 |
| 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 MCP79410-I/ST datasheet?
MCP79410-I/ST Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for MCP79410-I/ST?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the MCP79410-I/ST maintain accurate time during a main power failure?
The MCP79410-I/ST includes an automatic power-switchover circuit that transfers the supply from the main VCC rail to a backup battery or supercapacitor when VCC drops below the threshold. The 32.768 kHz oscillator and timekeeping registers continue operating from the backup supply, typically a 3V coin cell providing years of standby life at the sub-1 µA backup current draw. This ensures uninterrupted clock accuracy across power cycles without any software intervention.
What I2C clock speeds does the MCP79410-I/ST support and how does supply voltage affect the maximum rate?
The MCP79410-I/ST supports Standard Mode (100 kHz) and Fast Mode (400 kHz) I2C operation at 3.3V and 5V supply voltages, but is limited to 100 kHz when running at the 1.8V nominal supply. Most microcontrollers running at 3.3V can communicate at the full 400 kHz rate, completing a full register write cycle in approximately 50 µs. The device uses a 7-bit I2C address with configurable bits, allowing up to 8 MCP79410 devices on the same bus.
What can be stored in the 64-byte SRAM of the MCP79410-I/ST and does it persist across power cycles?
The 64-byte on-chip SRAM is general-purpose user memory that can store calibration coefficients, device configuration parameters, event counters, or the last-known sensor reading as a complement to the RTC registers. Unlike the timekeeping registers which are battery-backed, the SRAM is powered from the main VCC rail only and its contents are lost when both VCC and the backup battery are removed. Applications that need SRAM data to survive power loss should supplement the MCP79410 with external EEPROM such as the 4-Kbit AT24C04.
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