RTC-7301SF:B0 Equivalent & Substitute Parts

Part Overview

The RTC-7301SF:B0 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by EPSON in a 24-SOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The RTC-7301SF:B0 operates across a wide supply voltage range of 2.4V to 5.5V with minimal timekeeping current consumption of 1µA to 2µA at 3V to 5V, and supports an extended operating temperature range of -40°C to 85°C with integrated alarm functionality.

Key Parameters

Parameter	RTC-7301SF:B0
Manufacturer	EPSON
Category	Clock/Timing
Type	Clock/Calendar
Interface	Parallel
Package / Case	24-SOP (0.213", 5.40mm Width)
Mounting Type	Surface Mount
Voltage - Supply	2.4V ~ 5.5V
Current - Timekeeping (Max)	1µA ~ 2µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Features	Alarm
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the RTC-7301SF:B0 is determined by the following critical parameters: parallel interface requirement, surface mount capability, operating temperature range of -40°C to 85°C, supply voltage compatibility within 2.4V to 5.5V, and alarm functionality. The substitute parts are grouped into two categories based on these constraints:

Category 1: Surface Mount Substitutes (24-SOIC Package) Parts DS17285SN-5+, DS1685S-3+, and DS1685S-3+T&R maintain the surface mount form factor with 24-pin SOIC packaging. These parts support parallel interface, alarm functionality, and extended temperature operation from -40°C to 85°C (DS17285SN-5+) or 0°C to 70°C (DS1685S variants). All three are active products with ROHS3 compliance.

Category 2: Through Hole Substitutes (24/28-DIP Packages) Parts DS12C887+, DS12CR887-33+, DS1744-70+, DS1744W-120+, and DS1744P-70+ provide through-hole mounting alternatives. DS12CR887-33+ and DS1744W-120+ support the extended temperature range of -40°C to 85°C and 0°C to 70°C respectively. DS12C887+ operates at 0°C to 70°C. All maintain parallel interface and alarm functionality with ROHS3 compliance.

Category 3: Extended Memory Surface Mount (28-SOIC Package) Part DS1501YZ+T&R offers surface mount capability in 28-SOIC packaging with parallel interface and alarm functionality, operating at 0°C to 70°C.

Parameter Comparison

Part Number	Manufacturer	Package / Case	Mounting Type	Interface	Voltage - Supply	Operating Temperature	Features	Product Status	RoHS Status
RTC-7301SF:B0	EPSON	24-SOP (0.213", 5.40mm)	Surface Mount	Parallel	2.4V ~ 5.5V	-40°C ~ 85°C	Alarm	Obsolete	ROHS3
DS12C887+	Analog Devices Inc./Maxim Integrated	24-DIP Module (0.600", 15.24mm)	Through Hole	Parallel	4.5V ~ 5.5V	0°C ~ 70°C	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
DS12CR887-33+	Analog Devices Inc./Maxim Integrated	24-DIP Module (0.600", 15.24mm)	Through Hole	Parallel	2.97V ~ 3.63V	-40°C ~ 85°C	Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger	Active	ROHS3
DS1501YZ+T&R	Analog Devices Inc./Maxim Integrated	28-SOIC (0.295", 7.50mm)	Surface Mount	Parallel	4.5V ~ 5.5V	0°C ~ 70°C	Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K	Active	ROHS3
DS1556P-70+	Analog Devices Inc./Maxim Integrated	34-PowerCap™ Module	Surface Mount	Parallel	4.5V ~ 5.5V	0°C ~ 70°C	Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K	Active	ROHS3
DS1685S-3+	Analog Devices Inc./Maxim Integrated	24-SOIC (0.295", 7.50mm)	Surface Mount	Parallel	2.7V ~ 3.7V	0°C ~ 70°C	Alarm, NVSRAM, Square Wave Output, Y2K	Active	ROHS3
DS1685S-3+T&R	Analog Devices Inc./Maxim Integrated	24-SOIC (0.295", 7.50mm)	Surface Mount	Parallel	2.7V ~ 3.7V	0°C ~ 70°C	Alarm, NVSRAM, Square Wave Output, Y2K	Active	ROHS3
DS17285SN-5+	Analog Devices Inc./Maxim Integrated	24-SOIC (0.295", 7.50mm)	Surface Mount	Parallel	4.5V ~ 5.5V	-40°C ~ 85°C	Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output	Active	ROHS3
DS1744-70+	Analog Devices Inc./Maxim Integrated	28-DIP Module (0.600", 15.24mm)	Through Hole	Parallel	4.5V ~ 5.5V	0°C ~ 70°C	Leap Year, NVSRAM, Y2K	Active	ROHS3
DS1744P-70+	Analog Devices Inc./Maxim Integrated	34-PowerCap™ Module	Surface Mount	Parallel	4.5V ~ 5.5V	0°C ~ 70°C	Leap Year, NVSRAM, Y2K	Active	ROHS3
DS1744W-120+	Analog Devices Inc./Maxim Integrated	28-DIP Module (0.600", 15.24mm)	Through Hole	Parallel	2.97V ~ 3.63V	0°C ~ 70°C	Leap Year, NVSRAM, Y2K	Active	ROHS3

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment. DS17285SN-5+ is the primary surface mount substitute, matching the RTC-7301SF:B0 in extended temperature range (-40°C to 85°C), 24-pin SOIC package form factor, and supply voltage compatibility (4.5V to 5.5V overlap). This part is actively manufactured and stocked.

For applications requiring the full 2.4V to 5.5V supply voltage range of the original part, DS12CR887-33+ provides through-hole mounting with matching temperature range (-40°C to 85°C) and narrower voltage specification (2.97V to 3.63V). DS1744W-120+ offers similar voltage and temperature characteristics in a 28-DIP package.

For surface mount designs with relaxed temperature requirements (0°C to 70°C), DS1685S-3+ and DS1685S-3+T&R provide 24-SOIC packaging with lower supply voltage range (2.7V to 3.7V) and reduced timekeeping current (2mA @ 3V). These parts are available in both tube and tape & reel packaging options.

Frequently Asked Questions (FAQ)

Q: Can DS17285SN-5+ directly replace RTC-7301SF:B0 in existing PCB designs? A: DS17285SN-5+ uses the same 24-SOIC surface mount package as the RTC-7301SF:B0 and maintains parallel interface compatibility. However, the supply voltage range differs (4.5V to 5.5V versus 2.4V to 5.5V). Designs operating within the 4.5V to 5.5V window can use this substitute without PCB modification. Designs requiring operation below 4.5V require alternative substitutes.

Q: What is the difference between DS1685S-3+ and DS1685S-3+T&R? A: Both parts are electrically identical with the same 24-SOIC package, voltage range (2.7V to 3.7V), and operating temperature (0°C to 70°C). The difference is packaging: DS1685S-3+ is supplied in tubes, while DS1685S-3+T&R is supplied in tape and reel format for automated assembly processes.

Q: Why do some substitutes have different operating temperature ranges? A: The RTC-7301SF:B0 operates from -40°C to 85°C. Substitutes with narrower ranges (0°C to 70°C) are suitable only for applications within those limits. DS17285SN-5+ and DS12CR887-33+ maintain the full -40°C to 85°C range for applications requiring extended temperature operation.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental and regulatory status of the RTC-7301SF:B0.

Q: What is the primary difference between surface mount and through-hole substitutes? A: Surface mount substitutes (DS17285SN-5+, DS1685S variants, DS1501YZ+T&R, DS1556P-70+, DS1744P-70+) use SOIC or PowerCap packages for automated PCB assembly. Through-hole substitutes (DS12C887+, DS12CR887-33+, DS1744-70+, DS1744W-120+) use DIP packages requiring manual insertion or wave soldering, suitable for legacy board designs or low-volume production.

Q: Which substitute offers the lowest timekeeping current consumption? A: DS12CR887-33+ and DS1744W-120+ both consume 2mA @ 3.3V and 2mA @ 3V respectively, matching the RTC-7301SF:B0 specification of 1µA to 2µA. DS1685S variants consume 2mA @ 3V. DS17285SN-5+ consumes 3mA @ 4.5V to 5.5V, which is higher than the original part.

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