MCP795W22T-I/ST Equivalent & Substitute Parts

Part Overview

The MCP795W22T-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 module in a 14-TSSOP surface mount package. The part is currently Active in product status with 677 units in stock inventory.

Finding equivalent and substitute parts for the MCP795W22T-I/ST becomes necessary when addressing supply chain constraints, design flexibility requirements, or specific application needs that may benefit from alternative RTC architectures or packaging configurations. Substitute parts must maintain functional compatibility across core timing, interface, and electrical parameters while accommodating differences in memory capacity, current consumption, and physical form factors.

Substiute Parts

MCP795W22T-I/ST

Microchip TechnologyIn Stock: 747MCP795W22T-I/ST Datasheet

Current PartRFQ

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

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

MFR RecommendedRFQ

DS3234SN#

Analog Devices Inc./Maxim IntegratedIn Stock: 232751DS3234SN# Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the MCP795W22T-I/ST is determined by the following critical parameters:

Interface Compatibility: All substitute parts must operate via SPI interface to maintain firmware and hardware compatibility with existing designs.

Time and Date Format: Substitute parts must support HH:MM:SS and YY-MM-DD date/time formats, with 12/24-hour capability to ensure seamless integration into timekeeping applications.

Operating Temperature Range: All substitutes must maintain -40°C to 85°C operating temperature specification to ensure reliability across industrial and commercial environments.

Supply Voltage Overlap: Substitute parts must operate within voltage ranges that overlap with the main part's 1.8V ~ 3.6V supply specification to enable direct integration into existing power delivery systems.

Surface Mount Packaging: All substitutes must use surface mount technology to maintain PCB assembly compatibility.

Regulatory Compliance: All substitutes must maintain ROHS3 compliance and MSL 1 rating to satisfy manufacturing and environmental requirements.

The two identified substitute parts—AB-RTCMC-32.768KHZ-ZIZE-S2-T and DS3234SN#—satisfy these core substitution criteria while introducing variations in memory capacity, current consumption, and physical packaging that may address specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

AB-RTCMC-32.768KHZ-ZIZE-S2-T (Abracon LLC): This substitute operates within the supply voltage range of the main part and maintains SPI interface compatibility. The 10-SMD Module packaging differs from the 14-TSSOP form factor, requiring PCB layout modifications. Current consumption is significantly lower at 0.35µA ~ 0.4µA, making this option suitable for ultra-low-power applications. All regulatory certifications (ROHS3, MSL 1) align with the main part. Feature set excludes EEPROM and Unique ID functionality compared to the MCP795W22T-I/ST.

DS3234SN# (Analog Devices Inc./Maxim Integrated): This substitute provides expanded memory capacity at 256B compared to the 64B of the main part, offering additional storage for application-specific data. The 20-SOIC packaging requires significant PCB redesign. Supply voltage range extends to 5.5V, providing broader compatibility with higher-voltage systems. Current consumption is substantially higher at 120µA ~ 160µA, making this option less suitable for battery-backed or ultra-low-power applications. All regulatory certifications (ROHS3, MSL 1) align with the main part. Feature set includes integrated TCXO/Crystal oscillator.

Both substitutes maintain Active product status and full regulatory compliance, ensuring long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the AB-RTCMC-32.768KHZ-ZIZE-S2-T directly replace the MCP795W22T-I/ST on existing PCBs?

A: No. The AB-RTCMC-32.768KHZ-ZIZE-S2-T uses a 10-SMD Module package versus the 14-TSSOP package of the main part. PCB layout and footprint modifications are required. SPI interface compatibility is maintained, but pin assignments and physical dimensions differ.

Q: What are the primary differences in current consumption between these parts?

A: The MCP795W22T-I/ST draws 1µA during timekeeping operation. The AB-RTCMC-32.768KHZ-ZIZE-S2-T draws 0.35µA ~ 0.4µA, offering superior power efficiency. The DS3234SN# draws 120µA ~ 160µA, consuming significantly more power and making it unsuitable for battery-dependent applications.

Q: Are all three parts suitable for -40°C to 85°C industrial temperature ranges?

A: Yes. All three parts maintain the -40°C to 85°C operating temperature specification, ensuring compatibility with industrial and commercial environmental requirements.

Q: Which substitute offers the lowest supply voltage operation?

A: The AB-RTCMC-32.768KHZ-ZIZE-S2-T operates from 1.1V, providing the lowest minimum supply voltage. The MCP795W22T-I/ST operates from 1.8V, and the DS3234SN# operates from 2V.

Q: Does the DS3234SN# provide additional functionality compared to the MCP795W22T-I/ST?

A: The DS3234SN# includes integrated TCXO/Crystal oscillator functionality and provides 256B memory versus 64B in the main part. However, it lacks the Unique ID feature present in the MCP795W22T-I/ST and consumes significantly more power during timekeeping operation.

Q: Are all parts ROHS3 compliant and suitable for regulated manufacturing environments?

A: Yes. All three parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, satisfying environmental and manufacturing regulatory requirements.