MCP795B22-I/ST Real Time Clock IC Equivalent and Substitute Parts

Part Overview

The MCP795B22-I/ST is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Microchip Technology. This device operates as a 64-byte SPI-based RTC in a 14-TSSOP surface mount package. The product status is listed as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MCP795B22-I/ST provides timekeeping with alarm capability, EEPROM storage, leap year compensation, square wave output, SRAM, unique ID, and watchdog timer functionality across a wide supply voltage range of 1.8V to 5.5V.

Substiute Parts

MCP795B22-I/ST

Microchip TechnologyIn Stock: 1091MCP795B22-I/ST Datasheet

Current PartRFQ

MCP795W11-I/ST

Microchip TechnologyIn Stock: 1419MCP795W11-I/ST Datasheet

MFR RecommendedRFQ

M41T94MQ6F

STMicroelectronicsIn Stock: 4814M41T94MQ6F Datasheet

MFR RecommendedRFQ

RX-4803LC:UB3 PURE SN

EPSONIn Stock: 1034RX-4803LC:UB3 PURE SN Datasheet

MFR RecommendedRFQ

RX-4803LC:UC3 PURE SN

EPSONIn Stock: 820RX-4803LC:UC3 PURE SN Datasheet

MFR RecommendedRFQ

RX-4803SA:UA3 PURE SN

EPSONIn Stock: 1034RX-4803SA:UA3 PURE SN Datasheet

MFR RecommendedRFQ

RX-4803SA:UAB PURE SN

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

MFR RecommendedRFQ

RX-4803SA:UB3 PURE SN

EPSONIn Stock: 857RX-4803SA:UB3 PURE SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCP795B22-I/ST is determined by the following critical parameters:

Primary Substitution Criteria:

• Interface type: SPI
• Operating temperature range: -40°C ~ 85°C
• RoHS3 compliance
• Surface mount packaging
• Timekeeping functionality with clock/calendar capability

Secondary Compatibility Factors:

• Supply voltage range compatibility
• Package form factor (physical dimensions and pin count)
• Memory capacity and feature set
• Time and date format support

Substitute parts are grouped into two categories based on package compatibility:

Category 1: 14-Pin TSSOP Package (Direct Pin-Compatible)

• MCP795W11-I/ST (Microchip Technology) - Active product status, narrower supply voltage range (1.8V ~ 3.6V)

Category 2: Alternative Package Formats (Functional Equivalents)

• M41T94MQ6F (STMicroelectronics) - 16-SOIC package, different memory size (44B), higher timekeeping current
• RX-4803LC:UB3 PURE SN (EPSON) - 12-TFSOJ package, compact form factor
• RX-4803LC:UC3 PURE SN (EPSON) - 12-TFSOJ package, compact form factor
• RX-4803SA:UA3 PURE SN (EPSON) - 14-SOIC package, wider body (5.00mm)
• RX-4803SA:UAB PURE SN (EPSON) - 14-SOIC package, tube packaging
• RX-4803SA:UB3 PURE SN (EPSON) - 14-SOIC package, tape & reel packaging

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (14-TSSOP Package):

MCP795W11-I/ST is the manufacturer-recommended substitute for the obsolete MCP795B22-I/ST. Both devices share identical 14-TSSOP packaging, SPI interface, 64-byte memory, and feature set. The primary difference is the reduced supply voltage range (1.8V ~ 3.6V versus 1.8V ~ 5.5V). This substitute is suitable for applications operating within the 1.8V to 3.6V supply range. Active product status ensures long-term availability and manufacturing support.

For Alternative Package Formats:

When package constraints permit alternative form factors, the following substitutes provide functional equivalence:

• M41T94MQ6F (STMicroelectronics, 16-SOIC): Suitable for designs with higher supply voltage requirements (2.7V ~ 5.5V). Note that memory capacity is reduced to 44B and timekeeping current is higher (1.4mA). Moisture sensitivity level is MSL 3, requiring controlled storage conditions.

• RX-4803LC Series (EPSON, 12-TFSOJ): Provides the most compact package option (2.40mm width). Supports wide supply voltage range (1.6V ~ 5.5V) with low timekeeping current (2.1µA ~ 3.4µA). Suitable for space-constrained applications. REACH status is affected.

• RX-4803SA Series (EPSON, 14-SOIC): Offers 14-pin configuration with wider body (5.00mm). Supports wide supply voltage range (1.6V ~ 5.5V) with low timekeeping current. Available in multiple packaging options (tape & reel, tube). REACH status is affected.

All substitute parts maintain ROHS3 compliance and -40°C to 85°C operating temperature range. Selection should be based on specific supply voltage requirements, package space availability, and storage condition capabilities.

Frequently Asked Questions (FAQ)

Q: Can MCP795W11-I/ST directly replace MCP795B22-I/ST in existing designs?

A: MCP795W11-I/ST is pin-compatible and functionally equivalent for applications operating within 1.8V to 3.6V supply voltage. If your design requires operation above 3.6V, alternative substitutes must be evaluated. Both devices share identical 14-TSSOP packaging, SPI interface, 64-byte memory, and feature set.

Q: What is the key difference between MCP795W11-I/ST and MCP795B22-I/ST?

A: The primary difference is supply voltage range. MCP795B22-I/ST operates from 1.8V to 5.5V, while MCP795W11-I/ST operates from 1.8V to 3.6V. MCP795W11-I/ST has active product status, ensuring continued manufacturing support and availability.

Q: Why does M41T94MQ6F have higher timekeeping current than the original part?

A: M41T94MQ6F is manufactured by STMicroelectronics and uses different internal architecture. Its timekeeping current is 1.4mA compared to 1µA for the MCP795B22-I/ST. This difference must be considered in battery-backed timekeeping applications where power consumption is critical.

Q: Are EPSON RX-4803 series parts fully compatible with MCP795B22-I/ST?

A: EPSON RX-4803 series parts provide functional equivalence in SPI interface, operating temperature range, and RoHS3 compliance. However, they use different package formats (12-TFSOJ or 14-SOIC) and have different memory specifications. PCB layout modifications are required for package changes. REACH status is affected for EPSON parts.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in three package formats: 14-TSSOP (MCP795W11-I/ST, identical to original), 16-SOIC (M41T94MQ6F), 12-TFSOJ (RX-4803LC series), and 14-SOIC (RX-4803SA series). Package selection depends on PCB layout constraints and available board space.

Q: Do all substitute parts support 12/24-hour time format?

A: MCP795W11-I/ST supports 12/24-hour time format identical to the original part. M41T94MQ6F supports 24-hour format only. EPSON RX-4803 series parts support 24-hour format only. Application firmware may require modification if 12-hour format is required.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: MCP795W11-I/ST and EPSON RX-4803 series parts have MSL 1 (unlimited shelf life). M41T94MQ6F has MSL 3, requiring storage in controlled humidity conditions (168-hour maximum exposure to 60% relative humidity at 30°C after package opening).

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant. However, EPSON RX-4803 series parts have affected REACH status, requiring compliance verification for applications subject to REACH regulations.