MCP795B12-I/ST Equivalent & Substitute Parts

Part Overview

The MCP795B12-I/ST is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Microchip Technology. This device integrates a 64-byte memory, SPI interface, and comprehensive timekeeping features including alarm, EEPROM, leap year compensation, square wave output, SRAM, unique ID, and watchdog timer capabilities. The part operates across a wide supply voltage range of 1.8V to 5.5V with battery backup support from 1.3V to 5.5V.

The MCP795B12-I/ST is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring RTC functionality with comparable electrical and mechanical specifications.

Substiute Parts

MCP795B12-I/ST

Microchip TechnologyIn Stock: 795MCP795B12-I/ST Datasheet

Current PartRFQ

MCP795W11-I/ST

Microchip TechnologyIn Stock: 1419MCP795W11-I/ST Datasheet

MFR RecommendedRFQ

CDP68HC68T1M2Z96

Renesas Electronics CorporationIn Stock: 730CDP68HC68T1M2Z96 Datasheet

MFR RecommendedRFQ

DS1347T+

Analog Devices Inc./Maxim IntegratedIn Stock: 1054DS1347T+ Datasheet

MFR RecommendedRFQ

M41T93ZQA6F

STMicroelectronicsIn Stock: 1417M41T93ZQA6F Datasheet

MFR RecommendedRFQ

RX-4803LC:UBB PURE SN

EPSONIn Stock: 1234RX-4803LC:UBB PURE SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCP795B12-I/ST is determined by the following critical parameters:

Primary Substitution Criteria:

• SPI interface compatibility
• Clock/Calendar functionality with HH:MM:SS:hh and YY-MM-DD-dd format support
• Operating temperature range: -40°C to 85°C
• RoHS3 compliance
• Surface mount packaging

Secondary Compatibility Factors:

• Supply voltage overlap within 1.8V ~ 5.5V range
• Timekeeping current consumption characteristics
• Memory capacity (64B preferred, but 32B or 7B acceptable depending on application requirements)
• Presence of alarm, leap year, and watchdog timer features

Substitute parts are grouped into two categories:

Category 1 - Direct Package Equivalents (14-TSSOP): Parts maintaining identical or pin-compatible packaging with comparable electrical specifications.

Category 2 - Functional Equivalents (Alternative Packages): Parts providing equivalent RTC functionality with different package types but compatible electrical characteristics and feature sets.

Parameter Comparison

Engineering Selection Recommendations

MCP795W11-I/ST (Microchip Technology)

This part is the manufacturer-recommended direct equivalent. It maintains identical packaging (14-TSSOP), memory capacity (64B), and feature set. The primary difference is the reduced supply voltage range (1.8V ~ 3.6V versus 1.8V ~ 5.5V). This part is active and widely available. Selection is appropriate for applications operating within the 1.8V to 3.6V supply range. RoHS3 compliance and MSL 1 rating match the original specification.

DS1347T+ (Analog Devices Inc./Maxim Integrated)

This part offers the lowest timekeeping current consumption (0.7µA ~ 0.8µA) and operates across 2V to 5.5V. The 8-WDFN package represents a significant size reduction. This part is active and RoHS3 compliant with MSL 1 rating. Selection is appropriate for power-constrained applications where package size reduction is acceptable and memory requirements are minimal.

M41T93ZQA6F (STMicroelectronics)

This part provides comprehensive RTC functionality with alarm, leap year, square wave output, SRAM, and watchdog timer features. The 16-VQFN package offers a compact footprint. Supply voltage range (2.38V ~ 5.5V) and battery backup (1.8V ~ 5.5V) support wide operating conditions. This part is active, RoHS3 compliant, and MSL 1 rated. Selection is appropriate for applications requiring robust timekeeping with integrated watchdog functionality.

RX-4803LC:UBB PURE SN (EPSON)

This part operates across the widest supply voltage range (1.6V ~ 5.5V) and features low timekeeping current consumption (2.1µA ~ 3.4µA). The 12-TFSOJ package is the smallest available. This part is active and RoHS3 compliant with MSL 1 rating. Selection is appropriate for ultra-low-power applications and space-constrained designs.

CDP68HC68T1M2Z96 (Renesas Electronics Corporation)

This part provides RTC functionality with 32B memory in a 16-SOIC package. Timekeeping current consumption is higher (20µA ~ 500µA) compared to other options. MSL rating is 3 (168 Hours), requiring controlled storage conditions. This part is active and RoHS3 compliant. Selection is appropriate only when package size is not a constraint and higher current consumption is acceptable.

Frequently Asked Questions (FAQ)

Q: Can MCP795W11-I/ST directly replace MCP795B12-I/ST in all applications?

A: MCP795W11-I/ST is the manufacturer-recommended equivalent and maintains identical packaging and memory capacity. However, the supply voltage range is reduced to 1.8V ~ 3.6V. Direct replacement is possible only in applications operating within this voltage range. Applications requiring operation above 3.6V require alternative parts.

Q: What is the primary difference between MCP795B12-I/ST and MCP795W11-I/ST?

A: Both parts share identical packaging (14-TSSOP), memory size (64B), and feature sets. The key difference is supply voltage range: MCP795B12-I/ST operates from 1.8V to 5.5V, while MCP795W11-I/ST operates from 1.8V to 3.6V. Battery backup voltage ranges also differ accordingly.

Q: Which substitute part offers the best power efficiency?

A: DS1347T+ provides the lowest timekeeping current consumption at 0.7µA ~ 0.8µA across its 2V to 5.5V operating range. RX-4803LC:UBB PURE SN offers competitive power efficiency at 2.1µA ~ 3.4µA with the widest supply voltage range (1.6V ~ 5.5V).

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are RoHS3 compliant. Moisture sensitivity levels vary: MCP795W11-I/ST, DS1347T+, M41T93ZQA6F, and RX-4803LC:UBB PURE SN are MSL 1 (Unlimited). CDP68HC68T1M2Z96 is MSL 3 (168 Hours), requiring controlled storage conditions.

Q: What packaging options are available among substitute parts?

A: Substitute parts are available in six different packages: 14-TSSOP (MCP795W11-I/ST), 16-SOIC (CDP68HC68T1M2Z96), 8-WDFN (DS1347T+), 16-VQFN (M41T93ZQA6F), and 12-TFSOJ (RX-4803LC:UBB PURE SN). Package selection depends on PCB layout constraints and application requirements.

Q: Can I use a substitute part with lower memory capacity?

A: Memory capacity varies among substitutes: MCP795W11-I/ST maintains 64B, CDP68HC68T1M2Z96 provides 32B, M41T93ZQA6F provides 7B, and RX-4803LC:UBB PURE SN and DS1347T+ do not specify memory size. Selection depends on application data storage requirements. Parts with reduced memory may not be suitable for applications requiring 64B storage.

Q: Which substitute part supports 12-hour time format?

A: MCP795W11-I/ST and CDP68HC68T1M2Z96 support both 12-hour and 24-hour time formats. M41T93ZQA6F supports 24-hour format only. RX-4803LC:UBB PURE SN and DS1347T+ support 24-hour format only.

Q: What is the significance of MSL rating for these parts?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (Unlimited) parts have no time restrictions. MSL 3 (168 Hours) parts, such as CDP68HC68T1M2Z96, must be soldered within 168 hours of package opening or require baking to restore moisture absorption capacity.