MCP795B11-I/ST Equivalent & Substitute Parts

Part Overview

The MCP795B11-I/ST is a Real Time Clock (RTC) IC with Clock/Calendar functionality, 64B memory, and SPI interface manufactured by Microchip Technology. This device is classified as Obsolete, which necessitates identification of active alternative components for new designs and ongoing production requirements. The part operates across a wide supply voltage range of 1.8V to 5.5V with integrated features including alarm, EEPROM, leap year compensation, square wave output, SRAM, unique ID, and watchdog timer functionality.

Substiute Parts

MCP795B11-I/ST

Microchip TechnologyIn Stock: 995MCP795B11-I/ST Datasheet

Current PartRFQ

MCP795W11-I/ST

Microchip TechnologyIn Stock: 1419MCP795W11-I/ST Datasheet

MFR RecommendedRFQ

AB1815-T3

Abracon LLCIn Stock: 52178AB1815-T3 Datasheet

MFR RecommendedRFQ

M41T93SMY6F

STMicroelectronicsIn Stock: 3156M41T93SMY6F Datasheet

MFR RecommendedRFQ

RX-4803LC:UCB PURE SN

EPSONIn Stock: 733RX-4803LC:UCB PURE SN Datasheet

MFR RecommendedRFQ

RX-4803SA:UAB PURE SN

EPSONIn Stock: 839RX-4803SA:UAB PURE SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCP795B11-I/ST is determined by the following critical parameters:

Primary Substitution Criteria:

• Clock/Calendar functionality with SPI interface
• Operating temperature range: -40°C to 85°C
• RoHS3 compliance
• Surface mount packaging
• Time format support: HH:MM:SS:hh (12/24 hr)
• Date format support: YY-MM-DD-dd

Secondary Compatibility Factors:

• Supply voltage compatibility (minimum 1.8V operation preferred)
• Memory capacity (64B or greater)
• Integrated features: Alarm, Leap Year, Watchdog Timer
• Current consumption in timekeeping mode
• Package form factor and pin count

The substitute parts identified below meet the core functional requirements while accommodating variations in package type, memory capacity, and supply voltage specifications. Package differences (14-TSSOP vs. 16-QFN vs. 18-SOX vs. 12-TFSOJ vs. 14-SOIC) require PCB layout redesign but do not affect functional compatibility when electrical parameters align.

Parameter Comparison

Engineering Selection Recommendations

MCP795W11-I/ST (Microchip Technology)

This is the manufacturer-recommended direct substitute. It maintains identical package (14-TSSOP), memory capacity (64B), and feature set as the MCP795B11-I/ST. The primary difference is reduced supply voltage range (1.8V ~ 3.6V vs. 1.8V ~ 5.5V). This part is Active status with ROHS3 compliance and unlimited MSL rating. Selection is appropriate for designs operating within the 1.8V to 3.6V supply envelope.

AB1815-T3 (Abracon LLC)

This substitute offers increased memory capacity (256B vs. 64B) and superior timekeeping current efficiency (0.17µA ~ 0.22µA vs. 1µA). Package change to 16-VFQFN requires PCB redesign. Supply voltage range is 1.7V ~ 3.6V. Active product status with ROHS3 compliance. Suitable for applications requiring extended data storage and low-power operation.

M41T93SMY6F (STMicroelectronics)

This part features integrated crystal (18-SOX package with 7.5mm width) and reduced memory (7B). Supply voltage range is 3V ~ 5.5V, making it suitable for higher voltage systems. Timekeeping current is 10µA at 5.5V. Active product status with ROHS3 compliance. Package change requires PCB redesign. Selection appropriate for 5V-dominant systems where integrated crystal is advantageous.

RX-4803LC:UCB PURE SN (EPSON)

Compact 12-TFSOJ package (0.094", 2.40mm width) with wide supply voltage range (1.6V ~ 5.5V). Memory size not specified. Timekeeping current is 2.1µA ~ 3.4µA at 3V ~ 5V. Active product status with ROHS3 compliance. REACH Affected status noted. Package change requires PCB redesign. Suitable for space-constrained applications.

RX-4803SA:UAB PURE SN (EPSON)

14-SOIC package (0.197", 5.00mm width) with wide supply voltage range (1.6V ~ 5.5V). Memory size not specified. Timekeeping current is 2.1µA ~ 3.4µA at 3V ~ 5V. Active product status with ROHS3 compliance. REACH Affected status noted. Package change requires PCB redesign. Suitable for applications requiring 14-pin SOIC form factor.

Frequently Asked Questions (FAQ)

Q: Can MCP795W11-I/ST be used as a direct replacement for MCP795B11-I/ST without PCB modification?

A: Yes. Both parts use identical 14-TSSOP packaging, pin count, and feature set. The primary constraint is supply voltage: MCP795W11-I/ST operates at 1.8V ~ 3.6V, while MCP795B11-I/ST operates at 1.8V ~ 5.5V. Direct substitution is valid only if your system supply voltage does not exceed 3.6V.

Q: What are the implications of package changes when selecting AB1815-T3 or M41T93SMY6F?

A: Package changes from 14-TSSOP to 16-VFQFN (AB1815-T3) or 18-SOX (M41T93SMY6F) require complete PCB layout redesign, including footprint changes, trace routing, and via placement. Electrical functionality remains compatible, but manufacturing and assembly processes must be updated.

Q: Which substitute offers the lowest power consumption in timekeeping mode?

A: AB1815-T3 provides the lowest timekeeping current at 0.17µA ~ 0.22µA at 1.8V ~ 3V, compared to 1µA for MCP795B11-I/ST and MCP795W11-I/ST. EPSON parts (RX-4803LC and RX-4803SA) consume 2.1µA ~ 3.4µA at 3V ~ 5V.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitutes carry ROHS3 Compliant certification. However, RX-4803LC:UCB PURE SN and RX-4803SA:UAB PURE SN are marked as REACH Affected, requiring verification against your supply chain compliance requirements.

Q: What is the significance of memory capacity differences among substitutes?

A: MCP795B11-I/ST and MCP795W11-I/ST provide 64B memory. AB1815-T3 provides 256B, offering greater data storage capacity. M41T93SMY6F and EPSON parts provide 7B or unspecified memory. Memory capacity selection depends on application requirements for storing configuration data, calibration values, or event logs beyond basic timekeeping.

Q: Can RX-4803LC or RX-4803SA be used in 5V systems?

A: Yes. Both EPSON parts support supply voltage up to 5.5V. However, timekeeping current specifications are provided at 3V ~ 5V range (2.1µA ~ 3.4µA), which is higher than Microchip alternatives at equivalent voltages.

Q: What is the impact of 12-hour vs. 24-hour time format support?

A: MCP795B11-I/ST, MCP795W11-I/ST, and AB1815-T3 support both 12-hour and 24-hour formats (HH:MM:SS:hh). M41T93SMY6F supports 24-hour format only (HH:MM:SS:hh). EPSON parts support 24-hour format only (HH:MM:SS). Application firmware must accommodate format differences during migration.