DS1307 Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The DS1307 is a Real Time Clock (RTC) IC with Clock/Calendar functionality, featuring I2C 2-Wire Serial interface in 8-DIP packaging. The main part (DS1307) is classified as Obsolete, with 4,078 units in stock. Due to its obsolete status, equivalent and substitute parts are necessary for new designs and ongoing production requirements. The DS1307+ variant is available as an Active product with improved RoHS3 compliance, while multiple manufacturer alternatives provide enhanced features, lower power consumption, and modern packaging options suitable for contemporary applications.

Key Parameters

Parameter	DS1307 (Main Part)
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Memory Size	56B
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2V ~ 4.6V
Current - Timekeeping (Max)	200µA @ 5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the DS1307 is determined by the following critical parameters:

Interface Compatibility: All substitute parts maintain I2C 2-Wire Serial interface, ensuring software and protocol compatibility.

Time/Date Format: All substitutes support HH:MM:SS (12/24 hr) and YY-MM-DD-dd formats, maintaining functional equivalence.

Memory Capacity: The DS1307 contains 56B of memory. Substitutes range from 2B to 256B; higher memory capacity does not prevent substitution but provides additional functionality.

Supply Voltage Range: The DS1307 operates at 4.5V ~ 5.5V. Substitutes with wider voltage ranges (1.7V ~ 5.5V or 2.7V ~ 5.5V) are compatible in 5V systems and offer enhanced flexibility for lower-voltage applications.

Battery Backup Voltage: The DS1307 requires 2V ~ 4.6V battery backup. Substitutes with overlapping or extended ranges (1.3V ~ 5.5V or 1.5V ~ 3.6V) maintain backup functionality.

Mounting Type: The main part uses Through Hole (8-DIP). Surface Mount alternatives (8-SOIC, 8-TSSOP, 16-QFN, 20-DFN, 8-MSOP, 8-VSSOP) require PCB redesign but are functionally equivalent.

Product Status & Compliance: Active products with RoHS3 compliance are preferred for new designs. The DS1307+ provides direct equivalence with improved compliance status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Interface	Memory Size	Voltage Supply	Battery Voltage	Current (Max)	Temp Range	Package	RoHS Status
DS1307	Analog Devices Inc./Maxim Integrated	Obsolete	I2C, 2-Wire Serial	56B	4.5V ~ 5.5V	2V ~ 4.6V	200µA @ 5V	0°C ~ 70°C	8-DIP	RoHS non-compliant
DS1307+	Analog Devices Inc./Maxim Integrated	Active	I2C, 2-Wire Serial	56B	4.5V ~ 5.5V	2V ~ 4.6V	200µA @ 5V	0°C ~ 70°C	8-DIP	ROHS3 Compliant
1339-31DCGI	Renesas Electronics Corporation	Active	I2C, 2-Wire Serial	—	3.3V ~ 5.5V	1.3V ~ 3.7V	200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
AB0805-T3	Abracon LLC	Active	I2C, 2-Wire Serial	256B	1.7V ~ 3.6V	1.5V ~ 3.6V	0.17µA ~ 0.22µA @ 1.8V ~ 3V	-40°C ~ 85°C	16-VFQFN Exposed Pad	ROHS3 Compliant
BU9873FVM-GTTR	Rohm Semiconductor	Not For New Designs	I2C, 2-Wire Serial	—	1.8V ~ 5.5V	—	1µA ~ 1.35µA @ 3V ~ 5.5V	-40°C ~ 85°C	8-VSSOP, 8-MSOP	ROHS3 Compliant
ISL12020MIRZ-T7A	Renesas Electronics Corporation	Active	I2C, 2-Wire Serial	128B	2.7V ~ 5.5V	1.8V ~ 5.5V	14µA ~ 15µA @ 3V ~ 5V	-40°C ~ 85°C	20-PowerLFDFN	ROHS3 Compliant
ISL12022IBZ-T7A	Renesas Electronics Corporation	Active	I2C, 2-Wire Serial	128B	2.7V ~ 5.5V	1.8V ~ 5.5V	14µA ~ 15µA @ 3V ~ 5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
ISL1208IB8Z	Renesas Electronics Corporation	Active	I2C, 2-Wire Serial	2B	2.7V ~ 5.5V	1.8V ~ 5.5V	4µA ~ 6µA @ 3V ~ 5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
M41T11M6F	STMicroelectronics	Active	I2C, 2-Wire Serial	56B	2V ~ 5.5V	2.5V ~ 4.6V	70µA @ 2V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant
MCP79400-I/ST	Microchip Technology	Active	I2C, 2-Wire Serial	64B	1.8V ~ 5.5V	1.3V ~ 5.5V	1.2µA (Typ) @ 3.3V	-40°C ~ 85°C	8-TSSOP	ROHS3 Compliant
MCP79401-I/SN	Microchip Technology	Active	I2C, 2-Wire Serial	64B	1.8V ~ 5.5V	1.3V ~ 5.5V	1.2µA (Typ) @ 3.3V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (No PCB Redesign Required):

DS1307+ is the primary direct replacement. It maintains identical pinout, package (8-DIP), voltage specifications, and memory capacity while upgrading to Active product status and RoHS3 compliance. This option requires no circuit modifications.

Surface Mount Alternatives (PCB Redesign Required):

For new designs or PCB revisions, surface mount options provide superior compliance and performance characteristics:

M41T11M6F (STMicroelectronics, 8-SOIC) offers identical 56B memory and matching supply voltage range (2V ~ 5.5V) with lower timekeeping current (70µA) and extended temperature range (-40°C ~ 85°C). RoHS3 compliant and Active status.

MCP79401-I/SN (Microchip Technology, 8-SOIC) provides 64B memory, extended voltage range (1.8V ~ 5.5V), significantly lower timekeeping current (1.2µA typical @ 3.3V), and Active status with RoHS3 compliance.

ISL12022IBZ-T7A (Renesas Electronics Corporation, 8-SOIC) offers 128B memory, extended voltage range (2.7V ~ 5.5V), and low timekeeping current (14µA ~ 15µA @ 3V ~ 5V) with Active status and RoHS3 compliance.

Low-Power Applications:

AB0805-T3 (Abracon LLC, 16-VFQFN) is suitable for ultra-low-power designs with timekeeping current of 0.17µA ~ 0.22µA @ 1.8V ~ 3V. Requires 3.3V system redesign but provides 256B memory and extended temperature range (-40°C ~ 85°C).

Extended Temperature Range:

All substitute parts except DS1307+ support -40°C ~ 85°C operating range, compared to the DS1307's 0°C ~ 70°C. This is beneficial for industrial and automotive applications.

Compliance Status:

All substitute parts are RoHS3 compliant and carry Active product status, ensuring long-term availability and regulatory compliance. The DS1307 (Obsolete, RoHS non-compliant) should not be used in new designs.

Frequently Asked Questions (FAQ)

Q: Can DS1307+ be used as a direct drop-in replacement for DS1307?

A: Yes. DS1307+ maintains identical pinout, package type (8-DIP), supply voltage range (4.5V ~ 5.5V), battery backup voltage (2V ~ 4.6V), memory capacity (56B), and timekeeping current (200µA @ 5V). The primary difference is Active product status and RoHS3 compliance instead of Obsolete status and RoHS non-compliance.

Q: What are the key differences between through-hole (8-DIP) and surface-mount alternatives?

A: Through-hole packages (8-DIP) require through-hole PCB pads and are suitable for existing designs. Surface-mount packages (8-SOIC, 8-TSSOP, 16-VFQFN, 20-DFN, 8-MSOP, 8-VSSOP) require PCB redesign with surface-mount pads but offer smaller footprints, improved thermal characteristics, and modern manufacturing compatibility. All maintain I2C interface compatibility.

Q: Are all substitute parts software-compatible with DS1307?

A: Yes. All substitute parts maintain I2C 2-Wire Serial interface, HH:MM:SS (12/24 hr) time format, and YY-MM-DD-dd date format. Register-level compatibility may vary; consult individual datasheets for register map differences. The I2C protocol and basic timekeeping functionality are consistent across all parts.

Q: Which substitute offers the lowest power consumption?

A: AB0805-T3 (Abracon LLC) provides the lowest timekeeping current at 0.17µA ~ 0.22µA @ 1.8V ~ 3V. However, this part operates at 1.7V ~ 3.6V supply voltage, requiring system redesign from the DS1307's 4.5V ~ 5.5V range. For 5V systems, MCP79400-I/ST and MCP79401-I/SN offer 1.2µA typical timekeeping current @ 3.3V.

Q: What is the significance of "Not For New Designs" status for BU9873FVM-GTTR?

A: BU9873FVM-GTTR carries "Not For New Designs" product status, indicating the manufacturer recommends against using this part in new applications. While functionally compatible, it should only be used for legacy system maintenance or existing production lines. Active alternatives are preferred for new designs.

Q: Can I use a substitute with higher memory capacity (e.g., 256B instead of 56B)?

A: Yes. Higher memory capacity does not prevent substitution; it provides additional storage for user data. The DS1307's 56B memory is fully accessible in parts with 128B, 256B, or larger capacity. Software must be configured to use only the required memory range or can utilize additional capacity for enhanced functionality.

Q: What is the impact of extended temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C)?

A: Extended temperature range indicates the part operates reliably across a wider environmental spectrum. All substitute parts support -40°C ~ 85°C except DS1307+, which maintains the original 0°C ~ 70°C range. Extended range is beneficial for industrial, automotive, and outdoor applications but is not required for standard consumer electronics operating within 0°C ~ 70°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed carry RoHS3 compliance status. The original DS1307 is RoHS non-compliant. RoHS3 compliance is mandatory for products sold in the European Union and increasingly required by global manufacturers. This is a key reason substitution is necessary for new designs and ongoing production.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message