MCP79520T-I/MN Equivalent & Substitute Parts

Part Overview

The MCP79520T-I/MN is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Microchip Technology. This Surface Mount device operates across a 1.8V to 3.6V supply range with battery backup capability from 1.3V to 3.6V. The part is currently Active in product status and ROHS3 compliant. Substitute parts are identified when design requirements necessitate alternative voltage ranges, packaging formats, or supply chain availability while maintaining core RTC functionality.

Key Parameters

Parameter	MCP79520T-I/MN
Manufacturer	Microchip Technology
Category	Clock/Timing
Type	Clock/Calendar
Interface	SPI
Voltage - Supply	1.8V ~ 3.6V
Voltage - Supply, Battery	1.3V ~ 3.6V
Current - Timekeeping (Max)	1µA @ 1.8V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	10-WFDFN Exposed Pad
Memory Size	64B
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd
Features	Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Unique ID
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the MCP79520T-I/MN are qualified based on the following criteria:

Core Functional Requirements:

Clock/Calendar RTC functionality with SPI interface
Time format support: HH:MM:SS:hh (12/24 hr)
Date format support: YY-MM-DD-dd
Operating temperature range: -40°C ~ 85°C
Surface Mount technology
ROHS3 compliance and Active product status

Electrical Compatibility Parameters:

Supply voltage range overlap or compatibility with 1.8V ~ 3.6V primary range
Battery backup voltage support
Timekeeping current specifications

Packaging Considerations:

Alternative Surface Mount packages acceptable for board-level integration
Tape & Reel or Tube packaging formats for manufacturing compatibility

The substitute parts listed maintain these core parameters while offering variations in voltage supply ranges, packaging formats, and current consumption characteristics suitable for different application requirements.

Parameter Comparison

Parameter	MCP79520T-I/MN	AB-RTCMC-32.768KHZ-ZIZE-S2-T	DS1390U-18+	DS1390U-33+	DS1391U-33+T&R
Manufacturer	Microchip Technology	Abracon LLC	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Type	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar	Clock/Calendar
Interface	SPI	SPI	SPI	SPI	SPI
Voltage - Supply	1.8V ~ 3.6V	1.1V ~ 5.5V	1.71V ~ 1.89V	2.97V ~ 5.5V	2.97V ~ 5.5V
Voltage - Supply, Battery	1.3V ~ 3.6V	Not Specified	1.3V ~ 3.7V	1.3V ~ 5.5V	1.3V ~ 5.5V
Current - Timekeeping (Max)	1µA @ 1.8V ~ 3.6V	0.35µA ~ 0.4µA @ 2V ~ 5V	100µA @ 1.71V ~ 1.89V	175µA @ 2.97V ~ 5.5V	175µA @ 2.97V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	10-WFDFN Exposed Pad	10-SMD Module	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Time Format	HH:MM:SS:hh (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS:hh (12/24 hr)	HH:MM:SS:hh (12/24 hr)	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tube	Tube	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory and supply chain continuity.

AB-RTCMC-32.768KHZ-ZIZE-S2-T (Abracon LLC): Suitable for applications requiring extended voltage supply range (1.1V ~ 5.5V) with lower timekeeping current consumption (0.35µA ~ 0.4µA). Module packaging format requires board-level integration considerations. Recommended for low-power applications with flexible supply voltage requirements.

DS1390U-18+ (Analog Devices Inc./Maxim Integrated): Operates within a narrow supply voltage range (1.71V ~ 1.89V) with higher timekeeping current (100µA). Appropriate for fixed low-voltage supply designs. 10-TFSOP/10-MSOP package provides alternative footprint compatibility. Tube packaging suitable for lower-volume production.

DS1390U-33+ (Analog Devices Inc./Maxim Integrated): Operates across 2.97V ~ 5.5V supply range with 175µA timekeeping current. Suitable for higher voltage supply applications. 10-TFSOP/10-MSOP package and Tube packaging format. Recommended for designs with 3.3V or 5V primary supply rails.

DS1391U-33+T&R (Analog Devices Inc./Maxim Integrated): Functionally equivalent to DS1390U-33+ with identical electrical specifications (2.97V ~ 5.5V supply, 175µA timekeeping current). Cut Tape & Digi-Reel® packaging format optimized for high-volume manufacturing. Recommended for production environments requiring reel-based component handling.

Frequently Asked Questions (FAQ)

Q: Can the AB-RTCMC-32.768KHZ-ZIZE-S2-T replace the MCP79520T-I/MN in a 1.8V ~ 3.6V application?

A: Yes. The AB-RTCMC-32.768KHZ-ZIZE-S2-T supply voltage range (1.1V ~ 5.5V) encompasses the MCP79520T-I/MN operating range. The module format requires PCB integration verification, but electrical compatibility is maintained.

Q: What is the primary difference between DS1390U-18+ and DS1390U-33+?

A: The DS1390U-18+ operates at 1.71V ~ 1.89V supply voltage with 100µA timekeeping current, while DS1390U-33+ operates at 2.97V ~ 5.5V with 175µA timekeeping current. Selection depends on the target supply voltage of the application.

Q: Are DS1390U-33+ and DS1391U-33+T&R electrically identical?

A: Yes. Both parts share identical electrical specifications (2.97V ~ 5.5V supply, 175µA timekeeping current, 10-TFSOP/10-MSOP package). The difference is packaging format: DS1390U-33+ is supplied in Tube, while DS1391U-33+T&R is supplied in Cut Tape & Digi-Reel® format.

Q: Does the MCP79520T-I/MN 64B memory size affect substitute part selection?

A: Memory size is not specified for the substitute parts in the provided data. Functional RTC capability and SPI interface compatibility are the primary substitution criteria. Application-specific memory requirements must be evaluated separately.

Q: What packaging considerations apply when substituting the 10-WFDFN package?

A: The AB-RTCMC-32.768KHZ-ZIZE-S2-T uses a 10-SMD Module package, while DS1390/DS1391 series use 10-TFSOP/10-MSOP packages. PCB footprint, thermal management, and board layout must be re-evaluated for each alternative package type.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the MCP79520T-I/MN.

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