MCP79511T-I/MS - 3V SPI RTC with EUI-48 | Microchip
MPN: MCP79511T-I/MS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.49 | $2.49 |
| 10 | $2.29 | $22.90 |
| 100 | $1.89 | $189.00 |
| 500 | $1.49 | $745.00 |
| 1,000 | $1.19 | $1,190.00 |
| 3,000 | $0.99 | $2,970.00 |
MCP79511T-I/MS Overview
What is a real-time clock/calendar? An RTC maintains time and calendar information independently of the system processor, typically from a crystal oscillator and backup supply. An SPI RTC combines that timekeeping function with a serial peripheral interface and nonvolatile storage. The MCP79511T-I/MS belongs to the RTC and clock/timing category, providing system time, retained data, and programmable events without relying entirely on a microcontroller.
The MCP79511 family combines digital trimming compensation, a backup-power switchover circuit, and pre-programmed EUI-48 identification. Its integrated 64-byte battery-backed SRAM preserves frequently used configuration or counter data, while 1 Kbit EEPROM provides nonvolatile storage. The SPI interface allows the host to configure the device, read current time, program alarms and timers, and manage stored data over a compact serial connection.
The MCP79511T-I/MS is designed for low-power embedded systems where accurate timekeeping and identity are important. Digital trimming supports calibration of the oscillator, while the battery switchover helps maintain operation when the primary supply is removed. The interrupt output can indicate alarms, timer events, or other programmed conditions, allowing the host processor to remain inactive until an event occurs.
Typical applications include Ethernet-connected equipment requiring EUI-48 identification, industrial controllers, data-acquisition systems, network appliances, embedded instruments, and battery-backed telemetry products. The combination of RTC functionality, retained memory, EEPROM, and MAC identity can reduce the number of discrete components required in a design.
Designers should verify the crystal, load capacitors, supply decoupling, and backup-battery interface against the manufacturer datasheet. Firmware must also account for the device address, register map, interrupt behavior, and any required calibration sequence. The available verified source data confirms the 3 V SPI RTCC function, 64-byte SRAM, 1 Kbit EEPROM, EUI-48 identity, and 10-MSOP package.
This page consolidates manufacturer product information, distributor listings, interface details, and application guidance for engineers evaluating the MCP79511T-I/MS. Exact pricing, electrical limits, timing values, and pin assignments should be checked against the current Microchip datasheet before release to production.
Drop-in alternatives for MCP79511T-I/MS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MCP79511T-I/MS (same form factor and footprint) — differing in Interface, Package, Device Type, EEPROM Memory, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCP79511-I/MS
✅ Drop-In✓ In Stock
$1.07 / Unit
View Datasheet →MCP79512T-I/MN
✅ Drop-In📋 Reference alternative (not in catalog)
MCP79512-I/MN
✅ Drop-In📋 Reference alternative (not in catalog)
MCP79520-I/MN
✅ Drop-In📋 Reference alternative (not in catalog)
MCP79520-I/MS
✅ Drop-In📋 Reference alternative (not in catalog)
MCP79511T-I/MS Specifications
| Device Type | Real Time Clock/Calendar (RTCC) |
| Supply Voltage | 3 V |
| Interface | SPI |
| Battery-Backed SRAM | 64 bytes |
| EEPROM | 1 Kbit |
| Unique Identifier | Pre-programmed EUI-48 MAC ID |
| Package | 10-MSOP, 0.118 inch width, 3.00 mm width |
| Mounting Type | Surface Mount |
| Backup Power | Battery switchover |
| Clock Accuracy Feature | Digital trimming compensation |
| Interrupt | Interrupt output for alarms and events |
| Timer | Programmable timer/event support |
| Calendar | Real-time clock with calendar |
MCP79511T-I/MS 10-msop, 0.118 inch width, 3.00 mm width Pin Configuration Guide
Pin configuration for MCP79511T-I/MS (10-msop, 0.118 inch width, 3.00 mm width package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for MCP79511T-I/MS.
Refer to the datasheet for full pin configuration.
Typical Applications
MCP79511T-I/MS is suitable for 7 applications: Ethernet Network Identity, Industrial Data Acquisition, Battery-Backed Telemetry, Embedded Network Appliance, Precision Measurement Instrument, Battery-Powered IoT Device, Secure System Identity and Logging.
Ethernet Network Identity
The MCP79511T-I/MS is suitable for Ethernet-connected equipment because it combines a pre-programmed EUI-48 MAC ID with a 3 V SPI real-time clock/calendar. The identifier supports network-interface addressing, while the RTC and battery-backed SRAM help preserve system state across supply interruptions. An engineer can use the SPI interface to read or update stored configuration and calendar data without dedicating a separate identity-memory device. The integrated 1 Kbit EEPROM provides an additional nonvolatile storage option. Verify the exact EUI-48 programming and Ethernet system integration procedure in the manufacturer documentation.
Recommended
Industrial Data Acquisition
For industrial data-acquisition equipment, the MCP79511T-I/MS provides timestampable real-time information alongside retained configuration and event capabilities. Its 64-byte battery-backed SRAM can preserve operating state during a supply interruption, while the interrupt output can signal alarms or timers to a host controller. The 3 V supply arrangement fits modern embedded systems and the 10-MSOP package supports compact board layouts. Designers should confirm the operating-temperature grade and oscillator accuracy for the intended industrial environment.
Recommended
Battery-Backed Telemetry
The MCP79511T-I/MS is useful in telemetry and remote-monitoring products that must retain time stamps and operating information during power loss or battery transitions. The battery switchover function supports continued backup operation, while the 64-byte SRAM and 1 Kbit EEPROM provide separate retained and nonvolatile storage resources. The SPI host interface allows a low-power controller to retrieve time and data selectively. The exact backup-supply capacitor and current requirements should be taken from the current Microchip datasheet.
Recommended
Embedded Network Appliance
In network appliances, the MCP79511T-I/MS consolidates calendar timing, event notification, retained data, and EUI-48 identity into one low-power peripheral. The host processor can use SPI transactions to initialize the RTC, access EEPROM, configure alarms, and handle interrupt events. The integrated EUI-48 can simplify product identity requirements, although the finished appliance must still implement the required Ethernet and network-identity architecture. Confirm startup behavior and register access against the device documentation.
Recommended
Precision Measurement Instrument
The MCP79511T-I/MS can support measurement instruments that require repeatable timestamps, scheduled events, and configuration retention. Digital trimming compensation is a useful family feature when the design needs improved clock calibration, while the interrupt output allows alarms or timers to request host attention. The 1 Kbit EEPROM can store calibration or configuration data, and the battery-backed SRAM can hold short-lived operating state. The host should use the manufacturer trimming and initialization procedures to achieve the intended timing performance.
Recommended
Battery-Powered IoT Device
The MCP79511T-I/MS fits connected battery-powered products where low-power standby operation and reliable timekeeping are important. The backup-power path helps preserve the RTC and retained data during primary-supply removal, while the SPI interface allows intermittent host access. Its 10-MSOP package supports compact layouts, and the integrated EEPROM reduces the need for separate configuration storage in some designs. Validate standby current, battery life, and temperature performance against the current datasheet before deployment.
Recommended
Secure System Identity and Logging
The MCP79511T-I/MS can assist systems that need a stable identity value and local event history. The pre-programmed EUI-48 provides an identity resource, while the RTC and alarm functions can mark significant system events. The 64-byte battery-backed SRAM and 1 Kbit EEPROM provide limited storage for counters, configuration values, or diagnostic state. For security-critical designs, engineers must also implement appropriate authentication, access control, and secure manufacturing processes around the identity value.
Recommended
Recommended Products Summary
Engineering reference data for MCP79511T-I/MS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCP79511-I/MS | MCP79512T-I/MN | MCP79512-I/MN | MCP79520-I/MN | MCP79520-I/MS |
|---|---|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Device Type | 3 V SPI RTCC | SPI RTCC | SPI RTCC family variant | SPI RTCC family variant | SPI RTCC family variant | SPI RTCC family variant |
| Identity | Pre-programmed EUI-48 MAC ID | EUI-48 family variant | EUI variant requires verification | EUI variant requires verification | EUI variant requires verification | EUI variant requires verification |
| Temperature Qualification | T suffix; exact range not provided | Ordering variant; exact range not provided | T suffix; exact range not provided | Ordering variant; exact range not provided | Ordering variant; exact range not provided | Ordering variant; exact range not provided |
Key Differentiators
- Integrated EUI-48 identity in the same RTC package (vs MCP79511-I/MS)
- Three integrated storage and backup functions (vs MCP79512T-I/MN)
- SPI interface with calendar and event support (vs MCP79520-I/MS)
Design Notes
Design the primary and backup supplies around the manufacturer-recommended switchover circuit and capacitor arrangement. The MCP79511T-I/MS is specifically identified as supporting battery switchover, so the backup path should be tested with the system power removed, restored, and cycled repeatedly. Confirm the allowed voltage range, backup-current budget, and capacitor leakage requirements in the current datasheet before layout release.
Place the crystal, associated load components, decoupling capacitors, and backup-supply components close to the device pins. Keep SPI routing short and controlled, and provide a solid ground reference. Because the MCP79511T-I/MS supports digital trimming and event interrupts, a clean oscillator and supply environment is important for maintaining predictable timing and avoiding communication errors.
Do not assume that every MCP79511 family ordering code is automatically interchangeable. The verified data lists MCP79511, MCP79512, and MCP79520 variants, but memory configuration, EUI type, temperature grade, and package details may differ. Check the complete ordering table, pinout, electrical limits, and device revision before substituting an alternative into an existing PCB.
Compliance Information
The supplied verified web data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for MCP79511T-I/MS. Confirm these claims with the current manufacturer product documentation or supplier declarations.
