MCP795B10T-I/ST Equivalent & Substitute Parts

Part Overview

The MCP795B10T-I/ST is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by Microchip Technology. This device integrates a 64-byte SPI interface with alarm, EEPROM, leap year compensation, square wave output, SRAM, unique ID, and watchdog timer capabilities in a 14-TSSOP surface mount package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MCP795B10T-I/ST
Manufacturer	Microchip Technology
Category	Clock/Timing
Type	Clock/Calendar
Interface	SPI
Memory Size	64B
Voltage - Supply	1.8V ~ 5.5V
Voltage - Supply, Battery	1.3V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MCP795B10T-I/ST is determined by the following critical parameters:

Interface Protocol: SPI communication standard
Functional Features: Clock/Calendar with alarm capability and leap year compensation
Supply Voltage Range: Compatibility with 1.8V to 5.5V operating range
Operating Temperature: -40°C to 85°C industrial range
Package Type: Surface mount configuration
RoHS Compliance: ROHS3 Compliant status
Product Status: Active or available alternatives to obsolete part

The three substitute parts listed below meet these core substitution criteria while maintaining functional equivalence for RTC clock/calendar applications.

Parameter Comparison

Parameter	MCP795B10T-I/ST	M41T94MH6F	PCF85063BTL/1,118	RX-4803LC:UA3 PURE SN
Manufacturer	Microchip Technology	STMicroelectronics	NXP USA Inc.	EPSON
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Interface	SPI	SPI	SPI	SPI
Memory Size	64B	44B	-	-
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS:hh (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Voltage - Supply	1.8V ~ 5.5V	2.7V ~ 5.5V	0.9V ~ 5.5V	1.6V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)	28-SOP (0.350", 8.89mm Width)	10-XFDFN Exposed Pad	12-TFSOJ (0.094", 2.40mm Width)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

M41T94MH6F (STMicroelectronics): Active product status with ROHS3 compliance. Provides 44-byte memory and 24-hour time format. Supply voltage range of 2.7V to 5.5V requires verification against designs requiring 1.8V operation. Package change from 14-TSSOP to 28-SOP necessitates PCB layout redesign. Suitable for applications where board space permits larger package footprint.

PCF85063BTL/1,118 (NXP USA Inc.): Active product with ROHS3 compliance and widest supply voltage range (0.9V to 5.5V). Lowest timekeeping current at 0.6µA @ 3.3V. Smallest package footprint (10-XFDFN). Supports both 12-hour and 24-hour time formats. Memory size not specified in available data. Optimal for ultra-low-power and space-constrained applications.

RX-4803LC:UA3 PURE SN (EPSON): Active product with ROHS3 compliance. Supply voltage range of 1.6V to 5.5V maintains compatibility with lower voltage designs. Compact 12-TFSOJ package (0.094", 2.40mm Width) provides moderate space efficiency. 24-hour time format only. Suitable for applications requiring low-voltage operation with compact form factor.

Frequently Asked Questions (FAQ)

Q: Can the MCP795B10T-I/ST be directly replaced without PCB modifications?

A: Direct replacement without PCB modifications is not possible. All substitute parts use different package types: M41T94MH6F uses 28-SOP, PCF85063BTL/1,118 uses 10-XFDFN, and RX-4803LC:UA3 uses 12-TFSOJ, compared to the original 14-TSSOP. PCB layout redesign is required for any substitute.

Q: Which substitute part has the closest voltage compatibility?

A: PCF85063BTL/1,118 offers the widest supply voltage range (0.9V to 5.5V), providing maximum flexibility. RX-4803LC:UA3 operates from 1.6V to 5.5V, maintaining lower voltage compatibility closer to the original 1.8V minimum. M41T94MH6F has a minimum of 2.7V, which may not support designs requiring 1.8V operation.

Q: What are the memory differences between substitute parts?

A: MCP795B10T-I/ST provides 64 bytes of memory. M41T94MH6F provides 44 bytes. PCF85063BTL/1,118 and RX-4803LC:UA3 do not specify memory size in available documentation. Applications requiring specific memory capacity must verify compatibility with the selected substitute.

Q: Are all substitute parts RoHS compliant?

A: Yes. MCP795B10T-I/ST, M41T94MH6F, PCF85063BTL/1,118, and RX-4803LC:UA3 are all ROHS3 Compliant.

Q: Which substitute part is best for space-constrained designs?

A: PCF85063BTL/1,118 with 10-XFDFN package offers the smallest footprint. RX-4803LC:UA3 with 12-TFSOJ (0.094", 2.40mm Width) provides the next most compact option. M41T94MH6F with 28-SOP is the largest.

Q: Do all substitute parts support both 12-hour and 24-hour time formats?

A: MCP795B10T-I/ST and PCF85063BTL/1,118 support both 12-hour and 24-hour formats. M41T94MH6F and RX-4803LC:UA3 support 24-hour format only.

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