MCP795B12T-I/ST Equivalent & Substitute Parts

Part Overview

The MCP795B12T-I/ST is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Microchip Technology. This device integrates a 64-byte SRAM, SPI interface, and features including alarm capability, EEPROM storage, leap year compensation, square wave output, and watchdog timer functionality. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity. Substitute parts must maintain functional equivalence across critical parameters including interface protocol, voltage supply ranges, operating temperature, and package compatibility.

Substiute Parts

MCP795B12T-I/ST

Microchip TechnologyIn Stock: 1123MCP795B12T-I/ST Datasheet

Current PartRFQ

AB-RTCMC-32.768KHZ-EOA9-S3-DBT

Abracon LLCIn Stock: 1558AB-RTCMC-32.768KHZ-EOA9-S3-DBT Datasheet

MFR RecommendedRFQ

AB-RTCMC-32.768KHZ-ZIZE-S2-T

Abracon LLCIn Stock: 2110AB-RTCMC-32.768KHZ-ZIZE-S2-T Datasheet

MFR RecommendedRFQ

DS1390U-18+

Analog Devices Inc./Maxim IntegratedIn Stock: 956DS1390U-18+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MCP795B12T-I/ST is determined by the following critical parameters:

Interface Compatibility: All substitute parts must utilize SPI protocol to maintain firmware and PCB layout compatibility.

Voltage Supply Ranges: Substitute parts must support the operating voltage range of 1.8V ~ 5.5V for primary supply and 1.3V ~ 5.5V for battery backup to ensure functional equivalence in the target application.

Operating Temperature: All substitutes must maintain the -40°C ~ 85°C operating temperature range.

Time and Date Format: Substitute parts must support 12/24-hour time format and YY-MM-DD-dd date format.

Mounting and Package: Surface mount technology is required. Package form factor differences are acceptable provided the substitute maintains electrical and functional compatibility.

RoHS Compliance: All substitute parts must maintain ROHS3 compliance status.

The three qualified substitute parts meet these criteria while offering active product status and improved availability compared to the obsolete MCP795B12T-I/ST.

Parameter Comparison

Engineering Selection Recommendations

AB-RTCMC-32.768KHZ-EOA9-S3-DBT (Abracon LLC): This substitute is classified as active product status with 1450 units in stock. It provides SPI interface compatibility and supports the required 12/24-hour time format and YY-MM-DD-dd date format. The voltage supply range of 1.4V ~ 5.5V overlaps the MCP795B12T-I/ST requirements. ROHS3 compliance is maintained. This part is packaged as a 10-SMD Module with Tape & Reel packaging.

AB-RTCMC-32.768KHZ-ZIZE-S2-T (Abracon LLC): This substitute offers active product status with 2023 units in stock, providing the highest inventory availability. It maintains SPI interface compatibility and supports the required time and date formats. The voltage supply range extends to 1.1V ~ 5.5V, providing broader low-voltage coverage. ROHS3 compliance is maintained. This part is packaged as a 10-SMD Module with Cut Tape & Digi-Reel packaging.

DS1390U-18+ (Analog Devices Inc./Maxim Integrated): This substitute is classified as active product status with 851 units in stock. It provides SPI interface compatibility and supports the required 12/24-hour time format and YY-MM-DD-dd date format. The voltage supply range of 1.71V ~ 1.89V is narrower than the original part. ROHS3 compliance is maintained. This part is packaged in 10-TFSOP/10-MSOP format with Tube packaging.

All three substitutes maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the AB-RTCMC-32.768KHZ-EOA9-S3-DBT replace the MCP795B12T-I/ST directly?

A: The AB-RTCMC-32.768KHZ-EOA9-S3-DBT maintains SPI interface compatibility and supports the required voltage supply range (1.4V ~ 5.5V overlaps with 1.8V ~ 5.5V), operating temperature range, and time/date formats. The primary difference is the package form factor (10-SMD Module versus 14-TSSOP), which requires PCB layout modification. Functional compatibility is maintained.

Q: What is the key difference between the two Abracon substitutes?

A: Both AB-RTCMC-32.768KHZ-EOA9-S3-DBT and AB-RTCMC-32.768KHZ-ZIZE-S2-T are 10-SMD Modules with SPI interface. The AB-RTCMC-32.768KHZ-ZIZE-S2-T offers a lower minimum supply voltage (1.1V versus 1.4V) and lower timekeeping current (0.35µA ~ 0.4µA versus 1.5µA ~ 2.2µA). Packaging differs: the EOA9-S3-DBT uses Tape & Reel, while the ZIZE-S2-T uses Cut Tape & Digi-Reel.

Q: Is the DS1390U-18+ suitable for applications requiring the full 1.8V ~ 5.5V supply range?

A: The DS1390U-18+ has a narrower primary supply voltage range of 1.71V ~ 1.89V, which does not fully cover the original part's 1.8V ~ 5.5V range. This substitute is suitable only for applications where the supply voltage remains within 1.71V ~ 1.89V. Battery backup voltage range is 1.3V ~ 3.7V.

Q: Do all substitutes support the same memory configuration as the MCP795B12T-I/ST?

A: The MCP795B12T-I/ST provides 64B memory. The AB-RTCMC-32.768KHZ-EOA9-S3-DBT provides 8B memory, and the AB-RTCMC-32.768KHZ-ZIZE-S2-T does not specify memory size. The DS1390U-18+ does not specify memory size. Memory capacity differences may impact application requirements.

Q: Are all substitutes RoHS compliant?

A: All three substitute parts maintain ROHS3 compliance status, consistent with the original MCP795B12T-I/ST.

Q: What packaging considerations apply when selecting a substitute?

A: The MCP795B12T-I/ST uses 14-TSSOP packaging. The Abracon substitutes use 10-SMD Module packaging, and the DS1390U-18+ uses 10-TFSOP/10-MSOP packaging. Package form factor changes require PCB layout modification and may affect board space allocation and thermal characteristics.