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MCP79411T-I/MS Equivalent & Substitute Parts
Part Overview
The MCP79411T-I/MS is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Microchip Technology. This device operates as a 64B/1Kb I2C, 2-Wire Serial interface component in an 8-TSSOP/8-MSOP surface mount package. The part is currently Active in product status with 3100 units in stock inventory.
Substitute parts are identified when equivalent RTC Clock/Calendar functionality is required due to component availability, design revision, or application-specific packaging and performance requirements. Substitution is determined by matching critical electrical parameters, interface compatibility, and mechanical form factors.
Substiute Parts
Key Parameters
| Parameter | MCP79411T-I/MS |
|---|---|
| Manufacturer | Microchip Technology |
| Category | Clock/Timing |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Memory Size | 64B, 1Kb |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Voltage - Supply | 1.8V ~ 5.5V |
| Voltage - Supply, Battery | 1.3V ~ 5.5V |
| Current - Timekeeping (Max) | 1.2µA @ 3.3V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Features | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the MCP79411T-I/MS are grouped based on the following critical parameters that determine functional and mechanical compatibility:
Primary Substitution Criteria:
- Interface Type: I2C, 2-Wire Serial (mandatory match)
- Time Format: HH:MM:SS with 12/24 hour capability (mandatory match)
- Date Format: YY-MM-DD-dd (mandatory match)
- Operating Temperature Range: -40°C ~ 85°C (mandatory match)
- Supply Voltage Compatibility: Overlap within 1.8V ~ 5.5V range
- Mounting Type: Surface Mount (mandatory match)
- RoHS Status: ROHS3 Compliant (mandatory match)
Secondary Compatibility Factors:
- Package form factor (8-pin variants acceptable with mechanical verification)
- Memory capacity (64B minimum for SRAM/NVSRAM)
- Timekeeping current consumption (lower is preferred for battery operation)
- Feature set (Alarm, Leap Year, Square Wave Output as baseline)
Substitutes are organized by package type and electrical performance characteristics. Parts with identical or superior electrical specifications and matching interface protocols are considered direct substitutes.
Parameter Comparison
| Parameter | MCP79411T-I/MS | 1338-31DCGI8 | DS1307N+ | DS1339BU+ | DS1340Z-18+ | DS1340Z-33+ | ISL12008IB8Z-T | ISL12022MIBZ | ISL12058IBZ | ISL12058IRTZ-T |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Renesas Electronics | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Analog Devices/Maxim | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Interface | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial |
| Time Format | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS:hh (24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Voltage - Supply | 1.8V ~ 5.5V | 3.3V ~ 5.5V | 4.5V ~ 5.5V | 1.71V ~ 5.5V | 1.71V ~ 5.5V | 2.97V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 1.8V ~ 3.6V | 1.8V ~ 3.6V |
| Voltage - Supply, Battery | 1.3V ~ 5.5V | 1.3V ~ 3.7V | 2V ~ 4.6V | 1.3V ~ 3.7V | 1.3V ~ 3.7V | 1.3V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | Not specified | Not specified |
| Current - Timekeeping (Max) | 1.2µA @ 3.3V | 5µA @ 3.63V ~ 5.5V | 200µA @ 5V | 200µA @ 1.71V ~ 5.5V | 100µA @ 1.89V | 150µA @ 5.5V | 4µA ~ 6µA @ 3V ~ 5V | 14µA ~ 15µA @ 3V ~ 5V | 0.65µA @ 1.8V | 0.65µA @ 1.8V |
| Mounting Type | Surface Mount | Surface Mount | Through Hole | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm) | 8-SOIC (0.154", 3.90mm) | 8-DIP (0.300", 7.62mm) | 8-TSSOP, 8-MSOP (0.118", 3.00mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 8-SOIC (0.154", 3.90mm) | 20-SOIC (0.295", 7.50mm) | 8-SOIC (0.154", 3.90mm) | 8-WDFN Exposed Pad |
| Memory Size | 64B, 1Kb | 56B | 56B | Not specified | Not specified | Not specified | Not specified | 128B | Not specified | Not specified |
| Features | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID | Leap Year, NVSRAM, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Leap Year, Trickle-Charger | Leap Year, Trickle-Charger | Alarm, Leap Year | Alarm, Daylight Savings, Leap Year, SRAM | Alarm, Leap Year | Alarm, Leap Year |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and ROHS3 compliance, meeting baseline regulatory and availability requirements.
Surface Mount Package Compatibility (Direct Mechanical Substitutes): DS1339BU+ operates in the identical 8-TSSOP/8-MSOP package as the MCP79411T-I/MS. This part provides Alarm functionality, Leap Year support, Square Wave Output, and Trickle-Charger capability with supply voltage range of 1.71V ~ 5.5V and battery voltage support of 1.3V ~ 3.7V.
8-SOIC Package Alternatives (Mechanical Redesign Required): 1338-31DCGI8, DS1340Z-18+, DS1340Z-33+, ISL12008IB8Z-T, and ISL12058IBZ operate in 8-SOIC packages (0.154", 3.90mm width). These parts require PCB layout modification but maintain I2C interface compatibility and -40°C ~ 85°C operating temperature range. ISL12058IBZ and ISL12058IRTZ-T offer the lowest timekeeping current consumption at 0.65µA @ 1.8V, suitable for extended battery-powered applications.
Expanded Feature Set: ISL12022MIBZ provides 128B memory capacity with Daylight Savings functionality in a 20-SOIC package, offering enhanced calendar capabilities for applications requiring automatic time adjustment.
Through-Hole Alternative: DS1307N+ provides a through-hole 8-DIP package option for legacy or breadboard-compatible designs, though it operates at higher timekeeping current (200µA @ 5V) and requires supply voltage minimum of 4.5V.
Frequently Asked Questions (FAQ)
Q: Can DS1307N+ directly replace MCP79411T-I/MS in a surface mount PCB? A: No. DS1307N+ is a through-hole 8-DIP package component, while MCP79411T-I/MS is surface mount 8-TSSOP/8-MSOP. PCB redesign is required for through-hole mounting. For surface mount applications, select DS1339BU+, DS1340Z series, or ISL12008IB8Z-T variants.
Q: What is the key difference between DS1340Z-18+ and DS1340Z-33+? A: Both operate in 8-SOIC packages with identical functionality. DS1340Z-18+ supports supply voltage 1.71V ~ 5.5V with timekeeping current of 100µA @ 1.89V. DS1340Z-33+ supports supply voltage 2.97V ~ 5.5V with timekeeping current of 150µA @ 5.5V. Select DS1340Z-18+ for lower voltage applications.
Q: Which substitute offers the lowest power consumption for battery-backed operation? A: ISL12058IBZ and ISL12058IRTZ-T both deliver 0.65µA @ 1.8V timekeeping current, the lowest among all listed substitutes. ISL12058IRTZ-T uses an 8-WDFN Exposed Pad package; ISL12058IBZ uses 8-SOIC. Both are limited to 1.8V ~ 3.6V supply voltage range.
Q: Are all substitute parts I2C compatible with the MCP79411T-I/MS? A: Yes. All listed substitutes use I2C, 2-Wire Serial interface protocol. However, register maps and command structures may differ between manufacturers. Firmware integration testing is required before production deployment.
Q: Does ISL12022MIBZ provide a direct package replacement? A: No. ISL12022MIBZ uses a 20-SOIC package (0.295", 7.50mm width) compared to the 8-pin packages of other substitutes. This part is suitable for applications requiring expanded memory (128B) and Daylight Savings functionality, but requires significant PCB layout modification.
Q: What is the battery voltage compatibility range for long-term timekeeping? A: MCP79411T-I/MS supports 1.3V ~ 5.5V battery voltage. Substitutes vary: DS1340Z-33+ matches this range (1.3V ~ 5.5V), while ISL12058 variants support only 1.8V ~ 3.6V supply (no separate battery specification). Verify battery voltage requirements before selection.
Q: Can DS1339BU+ be used as a drop-in replacement for MCP79411T-I/MS? A: DS1339BU+ matches the 8-TSSOP/8-MSOP package footprint and provides compatible I2C interface, time/date formats, and operating temperature range. However, register definitions and initialization sequences differ. Firmware modification is required; physical PCB compatibility is confirmed.
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