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MCP79412T-I/MS Equivalent & Substitute Parts
Part Overview
The MCP79412T-I/MS is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Microchip Technology. This device operates as a 64-byte, 1-kilobyte I2C 2-Wire Serial interface component in an 8-TSSOP/8-MSOP surface mount package. The part is currently Active in product status with ROHS3 compliance and unlimited moisture sensitivity rating.
Substitute parts are identified when equivalent electrical and mechanical parameters align with the main device specifications, enabling direct replacement in applications requiring RTC Clock/Calendar functionality with I2C interface compatibility.
Substiute Parts
Key Parameters
| Parameter | MCP79412T-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 |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the MCP79412T-I/MS is determined by the following critical parameters:
Interface Compatibility: All substitute parts must support I2C 2-Wire Serial communication protocol.
Package Compatibility: Substitute parts must be available in 8-TSSOP/8-MSOP (0.118", 3.00mm Width) or mechanically equivalent packages to ensure PCB footprint compatibility.
Functional Equivalence: Substitute parts must provide Clock/Calendar functionality with HH:MM:SS (12/24 hr) time format and YY-MM-DD-dd date format.
Voltage Operating Range: Substitute parts must support supply voltage range of 1.8V ~ 5.5V and battery voltage range of 1.3V ~ 5.5V to maintain system compatibility.
Operating Temperature: Substitute parts must operate across -40°C ~ 85°C temperature range.
Compliance & Status: All substitute parts must maintain Active product status and ROHS3 compliance.
Substitute parts identified include DS1340U-18+, DS1340Z-33+, DS1388Z-33+, DS3231MZ+, DS3231SN#, DS3232SN#T&R, ISL12057IBZ, ISL1208IU8Z, and M41T00M6F.
Parameter Comparison
| Parameter | MCP79412T-I/MS | DS1340U-18+ | DS1340Z-33+ | DS1388Z-33+ | DS3231MZ+ | DS3231SN# | DS3232SN#T&R | ISL12057IBZ | ISL1208IU8Z | M41T00M6F |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Renesas Electronics Corporation | Renesas Electronics Corporation | STMicroelectronics |
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar |
| 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 (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS:hh (12/24 hr) | 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 (12/24 hr) | HH:MM:SS |
| 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 |
| Voltage - Supply | 1.8V ~ 5.5V | 1.71V ~ 5.5V | 2.97V ~ 5.5V | 2.97V ~ 3.63V | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 1.8V ~ 3.6V | 2.7V ~ 5.5V | 2V ~ 5.5V |
| Voltage - Supply, Battery | 1.3V ~ 5.5V | 1.3V ~ 3.7V | 1.3V ~ 5.5V | 1.3V ~ 5.5V | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 2.3V ~ 5.5V | Not Specified | 1.8V ~ 5.5V | 2.5V ~ 4.6V |
| 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 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
All identified substitute parts maintain Active product status and ROHS3 compliance, meeting baseline regulatory and availability requirements.
Direct Package Compatibility: DS1340U-18+ and ISL1208IU8Z are available in 8-TSSOP/8-MSOP (0.118", 3.00mm Width) packaging, providing direct PCB footprint compatibility with the MCP79412T-I/MS without layout modifications.
Package Conversion Required: DS1340Z-33+, DS1388Z-33+, DS3231MZ+, ISL12057IBZ, and M41T00M6F are available in 8-SOIC (0.154", 3.90mm Width) packaging. DS3231SN# is available in 16-SOIC (0.295", 7.50mm Width). DS3232SN#T&R is available in 20-SOIC (0.295", 7.50mm Width). These parts require PCB layout redesign to accommodate different package dimensions.
Voltage Range Considerations: DS1340U-18+ supports 1.71V ~ 5.5V supply voltage, providing extended low-voltage operation. DS1388Z-33+ operates at 2.97V ~ 3.63V supply voltage, limiting compatibility to mid-range voltage systems. ISL12057IBZ operates at 1.8V ~ 3.6V supply voltage, restricting use to lower voltage applications.
Current Consumption: MCP79412T-I/MS draws 1.2µA at 3.3V during timekeeping. ISL12057IBZ offers the lowest timekeeping current at 0.65µA @ 1.8V. DS1340U-18+ draws 100µA @ 1.89V. Higher current consumption devices include DS1340Z-33+ (150µA @ 5.5V), DS1388Z-33+ (150µA @ 2.97V ~ 3.63V), DS3231MZ+ (130µA ~ 200µA @ 3.63V ~ 5.5V), and M41T00M6F (70µA @ 2V ~ 5.5V).
Frequently Asked Questions (FAQ)
Q: Can DS1340U-18+ directly replace MCP79412T-I/MS without PCB modifications?
A: Yes. DS1340U-18+ is available in 8-TSSOP/8-MSOP (0.118", 3.00mm Width) packaging, matching the MCP79412T-I/MS footprint. Both devices support I2C 2-Wire Serial interface, operate across -40°C ~ 85°C, and maintain ROHS3 compliance. DS1340U-18+ supports 1.71V ~ 5.5V supply voltage, which encompasses the MCP79412T-I/MS range of 1.8V ~ 5.5V.
Q: What is the primary difference between 8-TSSOP/8-MSOP and 8-SOIC packages?
A: 8-TSSOP/8-MSOP packages measure 0.118" (3.00mm) in width, while 8-SOIC packages measure 0.154" (3.90mm) in width. These different physical dimensions require distinct PCB footprints and cannot be used interchangeably without layout redesign.
Q: Which substitute part offers the lowest power consumption during timekeeping?
A: ISL12057IBZ draws 0.65µA @ 1.8V, the lowest among all listed substitutes. However, ISL12057IBZ operates at 1.8V ~ 3.6V supply voltage, which is narrower than the MCP79412T-I/MS range of 1.8V ~ 5.5V.
Q: Are all substitute parts compatible with 12-hour and 24-hour time formats?
A: MCP79412T-I/MS, DS3231MZ+, DS3231SN#, DS3232SN#T&R, ISL12057IBZ, and ISL1208IU8Z support both 12-hour and 24-hour time formats. DS1340U-18+ and DS1340Z-33+ support 24-hour format only. DS1388Z-33+ supports 12-hour and 24-hour formats with subsecond resolution. M41T00M6F supports HH:MM:SS format without explicit 12/24-hour specification.
Q: What additional features does DS3232SN#T&R provide compared to MCP79412T-I/MS?
A: DS3232SN#T&R includes 236 bytes of SRAM memory, integrated TCXO/Crystal, and Alarm functionality. MCP79412T-I/MS provides 64 bytes and 1 kilobyte memory with Alarm, Leap Year, Square Wave Output, SRAM, and Unique ID features. Both devices support I2C 2-Wire Serial interface and operate across -40°C ~ 85°C.
Q: Can DS1388Z-33+ be used in applications requiring 5.5V supply voltage?
A: No. DS1388Z-33+ operates at 2.97V ~ 3.63V supply voltage. Applications requiring 5.5V supply voltage must select alternative parts such as DS1340Z-33+, DS3231MZ+, DS3231SN#, DS3232SN#T&R, ISL1208IU8Z, or M41T00M6F.
Q: Which substitute parts maintain battery voltage compatibility with MCP79412T-I/MS?
A: MCP79412T-I/MS supports 1.3V ~ 5.5V battery voltage. DS1340Z-33+, DS1388Z-33+, and ISL1208IU8Z also support 1.3V ~ 5.5V battery voltage range. DS1340U-18+ supports 1.3V ~ 3.7V. DS3231MZ+, DS3231SN#, and DS3232SN#T&R support 2.3V ~ 5.5V. M41T00M6F supports 2.5V ~ 4.6V. ISL12057IBZ does not specify battery voltage support.
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