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DS1307ZN Real Time Clock (RTC) IC Equivalent & Substitute Parts
Part Overview
The DS1307ZN is a Real Time Clock (RTC) IC manufactured by Analog Devices Inc./Maxim Integrated, designed for clock/calendar applications with I2C serial interface. This part is classified as Obsolete, which necessitates identification of functionally equivalent and mechanically compatible substitute components for ongoing design support and production continuity. The DS1307ZN provides 56 bytes of nonvolatile static RAM (NVSRAM), supports both 12-hour and 24-hour time formats, and operates across a supply voltage range of 4.5V to 5.5V with battery backup capability from 2V to 4.6V.
Substiute Parts
Key Parameters
| Parameter | DS1307ZN |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Product Status | Obsolete |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Memory Size | 56B |
| Interface | I2C, 2-Wire Serial |
| 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 | -40°C ~ 85°C |
| Features | Leap Year, NVSRAM, Square Wave Output |
| RoHS Status | RoHS non-compliant |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution of the DS1307ZN is determined by strict alignment of the following critical parameters:
Primary Substitution Criteria:
- Interface protocol: I2C, 2-Wire Serial (mandatory match)
- Package type: 8-SOIC (0.154", 3.90mm Width) for direct pin-compatible replacement
- Time format support: HH:MM:SS with 12/24-hour capability
- Date format support: YY-MM-DD-dd
- Operating temperature range: -40°C to 85°C minimum
- Memory architecture: NVSRAM or equivalent nonvolatile storage
- Features: Leap year support and square wave output capability
Secondary Compatibility Factors:
- Supply voltage compatibility: Parts must operate within or encompass the 4.5V ~ 5.5V range
- Battery backup voltage: 2V ~ 4.6V range preferred for direct replacement
- Timekeeping current consumption: Lower values acceptable; higher values require design review
- Product status: Active status preferred for long-term availability
Substitute parts are grouped into two categories: direct package-compatible replacements (8-SOIC) and functionally equivalent alternatives with different package geometries (8-MSOP, 20-DFN, 8-LCC).
Parameter Comparison
| Parameter | DS1307ZN | DS1307ZN+ | 1337GDVGI | 1338-31DCGI | 1338-31DCGI8 | 1338-31DVGI | ISL12020MIRZ-T7A | ISL12026AIBZ-T | M41T62LC6F | M41T82RM6F |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | STMicroelectronics | STMicroelectronics |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 20-PowerLFDFN | 8-SOIC (0.154", 3.90mm Width) | 8-LCC | 8-SOIC (0.154", 3.90mm Width) |
| Memory Size | 56B | 56B | — | 56B | 56B | 56B | 128B | — | — | 7B |
| Interface | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial | I2C, 2-Wire Serial |
| Time Format | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS:hh (24 hr) | HH:MM:SS:hh (24 hr) |
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 1.8V ~ 5.5V | 3.3V ~ 5.5V | 3.3V ~ 5.5V | 3.3V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 1.3V ~ 4.4V | 2.7V ~ 5.5V |
| Voltage - Supply, Battery | 2V ~ 4.6V | 2V ~ 4.6V | — | 1.3V ~ 3.7V | 1.3V ~ 3.7V | 1.3V ~ 3.7V | 1.8V ~ 5.5V | 1.8V ~ 5.5V | — | 2V ~ 5.5V |
| Current - Timekeeping (Max) | 200µA @ 5V | 200µA @ 5V | 0.6µA @ 1.3V ~ 1.8V | 5µA @ 3.63V ~ 5.5V | 5µA @ 3.63V ~ 5.5V | 5µA @ 3.63V ~ 5.5V | 14µA ~ 15µA @ 3V ~ 5V | 10µA ~ 20µA @ 2.7V ~ 5.5V | 0.7µA ~ 0.95µA @ 1.3V ~ 4.4V | 10µA @ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | Leap Year, NVSRAM, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | Alarm, Leap Year, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | Alarm, Daylight Savings, Leap Year, SRAM | Alarm, Leap Year | Alarm, Leap Year, Square Wave Output, Watchdog Timer | Alarm, Leap Year, SRAM, Watchdog Timer |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
Engineering Selection Recommendations
Direct Pin-Compatible Replacement (8-SOIC Package):
DS1307ZN+ is the primary direct substitute. This part maintains identical package geometry, pinout, memory architecture (56B NVSRAM), and electrical specifications while offering Active product status and ROHS3 compliance. Selection of DS1307ZN+ eliminates redesign requirements and provides immediate compatibility with existing PCB layouts.
1338-31DCGI and 1338-31DCGI8 (Renesas Electronics) provide functionally equivalent alternatives in 8-SOIC packaging with Active status and ROHS3 compliance. These parts support the same I2C interface, time/date formats, and feature set (Leap Year, NVSRAM, Square Wave Output). Supply voltage range extends to 3.3V minimum, and battery backup voltage range expands to 1.3V ~ 3.7V. Timekeeping current consumption is reduced to 5µA at nominal operating voltage. Both parts are suitable for direct PCB substitution.
ISL12026AIBZ-T (Renesas Electronics) operates in 8-SOIC packaging with Active status and ROHS3 compliance. This part supports I2C interface and required time/date formats with Alarm and Leap Year features. Supply voltage range is 2.7V ~ 5.5V with battery backup from 1.8V ~ 5.5V. Timekeeping current consumption ranges from 10µA to 20µA. This part is compatible with existing 8-SOIC footprints.
M41T82RM6F (STMicroelectronics) is available in 8-SOIC packaging with Active status and ROHS3 compliance. This part provides I2C interface, 24-hour time format, and YY-MM-DD-dd date format with Alarm, Leap Year, SRAM, and Watchdog Timer features. Supply voltage range is 2.7V ~ 5.5V with battery backup from 2V ~ 5.5V. Timekeeping current is 10µA at 5.5V. This part is suitable for 8-SOIC footprint replacement.
Alternative Package Options:
1337GDVGI (Renesas Electronics) provides 8-MSOP packaging with Active status and ROHS3 compliance. This part supports I2C interface, 12/24-hour time format, and YY-MM-DD-dd date format with Alarm, Leap Year, and Square Wave Output features. Supply voltage range is 1.8V ~ 5.5V with significantly reduced timekeeping current of 0.6µA at 1.3V ~ 1.8V. Selection requires PCB redesign for 8-MSOP footprint.
1338-31DVGI (Renesas Electronics) operates in 8-MSOP packaging with Active status and ROHS3 compliance. This part maintains the same feature set as 1338-31DCGI (Leap Year, NVSRAM, Square Wave Output) with identical electrical specifications. Selection requires PCB redesign for 8-MSOP footprint.
ISL12020MIRZ-T7A (Renesas Electronics) is packaged in 20-PowerLFDFN with Active status and ROHS3 compliance. This part provides expanded memory (128B), I2C interface, and enhanced features including Alarm, Daylight Savings, Leap Year, and SRAM. Supply voltage range is 2.7V ~ 5.5V with battery backup from 1.8V ~ 5.5V. Timekeeping current is 14µA ~ 15µA. Selection requires significant PCB redesign.
M41T62LC6F (STMicroelectronics) is packaged in 8-LCC with Active status and ROHS3 compliance. This part supports I2C interface with 24-hour time format and YY-MM-DD-dd date format. Supply voltage range is 1.3V ~ 4.4V with extremely low timekeeping current of 0.7µA ~ 0.95µA. Selection requires PCB redesign for 8-LCC footprint.
Compliance Considerations:
All recommended substitute parts hold ROHS3 compliance status, addressing the RoHS non-compliant status of the obsolete DS1307ZN. This compliance upgrade is mandatory for new designs and production continuity in regulated markets.
Frequently Asked Questions (FAQ)
Q: Can DS1307ZN+ be used as a direct replacement for DS1307ZN without PCB modification?
A: Yes. DS1307ZN+ maintains identical 8-SOIC (0.154", 3.90mm Width) package geometry and pinout. All electrical specifications, memory architecture (56B NVSRAM), and functional features (Leap Year, Square Wave Output) are preserved. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No PCB redesign is required.
Q: What are the key differences between 8-SOIC and 8-MSOP packages?
A: 8-SOIC measures 0.154" (3.90mm) in width, while 8-MSOP measures 0.118" (3.00mm) in width. Both packages contain 8 pins with identical pin spacing (0.050"), but the reduced body width of 8-MSOP requires PCB footprint redesign. Pin assignments and electrical function remain identical between packages for equivalent part numbers.
Q: Are all substitute parts compatible with 4.5V ~ 5.5V supply voltage?
A: No. DS1307ZN+ operates within 4.5V ~ 5.5V. Alternative parts have expanded voltage ranges: 1337GDVGI (1.8V ~ 5.5V), 1338-31DCGI/1338-31DCGI8/1338-31DVGI (3.3V ~ 5.5V), ISL12020MIRZ-T7A (2.7V ~ 5.5V), ISL12026AIBZ-T (2.7V ~ 5.5V), M41T62LC6F (1.3V ~ 4.4V), and M41T82RM6F (2.7V ~ 5.5V). Verify system supply voltage compatibility before selection.
Q: Which substitute part offers the lowest timekeeping current consumption?
A: M41T62LC6F provides the lowest timekeeping current at 0.7µA ~ 0.95µA across its operating voltage range (1.3V ~ 4.4V). This represents a 200-fold reduction compared to DS1307ZN (200µA @ 5V). Selection is appropriate for battery-powered applications requiring extended operational life.
Q: Do all substitute parts support both 12-hour and 24-hour time formats?
A: No. DS1307ZN, DS1307ZN+, 1337GDVGI, 1338-31DCGI, 1338-31DCGI8, 1338-31DVGI, ISL12020MIRZ-T7A, and ISL12026AIBZ-T support HH:MM:SS with 12/24-hour capability. M41T62LC6F and M41T82RM6F support HH:MM:SS:hh format with 24-hour operation only. Verify firmware compatibility with 24-hour-only implementations before selection.
Q: What is the significance of NVSRAM in the DS1307ZN?
A: NVSRAM (Nonvolatile Static RAM) combines volatile RAM with nonvolatile storage, preserving data during power loss. DS1307ZN provides 56 bytes of NVSRAM. Substitute parts 1338-31DCGI, 1338-31DCGI8, and 1338-31DVGI maintain identical 56-byte NVSRAM architecture. ISL12020MIRZ-T7A provides 128 bytes of SRAM. M41T82RM6F provides 7 bytes of SRAM. M41T62LC6F and ISL12026AIBZ-T do not specify memory size. Verify application requirements for nonvolatile storage capacity.
Q: Are battery backup voltage ranges compatible across all substitute parts?
A: No. DS1307ZN requires 2V ~ 4.6V battery backup. DS1307ZN+ maintains this range. Alternative parts offer expanded ranges: 1338-31DCGI/1338-31DCGI8/1338-31DVGI (1.3V ~ 3.7V), ISL12020MIRZ-T7A (1.8V ~ 5.5V), ISL12026AIBZ-T (1.8V ~ 5.5V), and M41T82RM6F (2V ~ 5.5V). M41T62LC6F does not specify battery backup voltage. Verify backup battery voltage compatibility with system design.
Q: Which substitute parts include Alarm functionality?
A: 1337GDVGI, ISL12020MIRZ-T7A, ISL12026AIBZ-T, M41T62LC6F, and M41T82RM6F include Alarm features. DS1307ZN, DS1307ZN+, 1338-31DCGI, 1338-31DCGI8, and 1338-31DVGI do not specify Alarm capability. Selection of alarm-equipped parts enables time-based interrupt generation for system wake-up and event triggering.
Q: What packaging options are available for direct PCB footprint compatibility?
A: 8-SOIC (0.154", 3.90mm Width) packaging maintains direct footprint compatibility with DS1307ZN. Parts available in this package: DS1307ZN+, 1338-31DCGI, 1338-31DCGI8, ISL12026AIBZ-T, and M41T82RM6F. Alternative packages requiring PCB redesign: 8-MSOP (1337GDVGI, 1338-31DVGI), 20-PowerLFDFN (ISL12020MIRZ-T7A), and 8-LCC (M41T62LC6F).
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