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RTC-8564JE:B0 Real Time Clock IC Equivalent & Substitute Parts
Part Overview
The RTC-8564JE:B0 is an EPSON Real Time Clock (RTC) IC with integrated clock/calendar functionality, designed for applications requiring accurate timekeeping with I2C serial interface. This 20-pin LSSOJ surface mount device operates across a wide supply voltage range (1.8V to 5.5V) and maintains ultra-low power consumption during timekeeping mode (0.7µA to 0.8µA at 3V to 5V). The device is ROHS3 compliant and currently in active production status with 1,191 units in stock.
Equivalent and substitute parts are identified based on functional compatibility within the Clock/Calendar IC category, maintaining critical electrical and mechanical parameters that ensure direct or near-direct replacement capability in system designs.
Substiute Parts
Key Parameters
| Parameter | RTC-8564JE:B0 |
|---|---|
| Manufacturer | EPSON |
| Category | Clock/Timing |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Package / Case | 20-LSSOJ (0.213", 5.40mm Width) |
| Voltage - Supply | 1.8V ~ 5.5V |
| Current - Timekeeping (Max) | 0.7µA ~ 0.8µA @ 3V ~ 5V |
| Operating Temperature | -40°C ~ 85°C |
| Time Format | HH:MM:SS |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Y2K |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the RTC-8564JE:B0 are classified based on the following critical parameters that determine functional compatibility:
Primary Substitution Criteria:
- Interface Type: I2C, 2-Wire Serial (mandatory match)
- Operating Temperature Range: -40°C ~ 85°C (mandatory match)
- Supply Voltage Compatibility: Overlap with 1.8V ~ 5.5V range
- Time/Date Format: HH:MM:SS and YY-MM-DD-dd support
- RoHS Compliance: ROHS3 Compliant
- Product Status: Active
Secondary Considerations:
- Package form factor (surface mount variants acceptable)
- Timekeeping current consumption (lower is preferred for battery-backed applications)
- Feature set (Alarm, Leap Year support)
Substitute parts are grouped into two categories:
Group A - Direct Package Compatibility (20-pin variants):
- ISL12022MIBZ (20-SOIC package, closest pin count match)
Group B - Functional Equivalents (alternative packages, 8-16 pin variants):
- AB1805-T3, DS1339AU+, DS1339U-3+T&R, DS1340C-33#T&R, DS1340Z-33+, ISL12057IUZ, ISL12058IRTZ-T, ISL12058IUZ, M41T62LC6F
All substitute parts maintain I2C interface, -40°C to 85°C operating range, and ROHS3 compliance.
Parameter Comparison
| Part Number | Manufacturer | Package / Case | Voltage - Supply | Current - Timekeeping (Max) | Operating Temperature | Interface | Time Format | Date Format | Features | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| RTC-8564JE:B0 | EPSON | 20-LSSOJ | 1.8V ~ 5.5V | 0.7µA ~ 0.8µA @ 3V ~ 5V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS | YY-MM-DD-dd | Alarm, Y2K | ROHS3 Compliant |
| AB1805-T3 | Abracon LLC | 16-VFQFN Exposed Pad | 1.7V ~ 3.6V | 0.17µA ~ 0.22µA @ 1.8V ~ 3V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS:hh | YY-MM-DD-dd | Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog Timer | ROHS3 Compliant |
| DS1339AU+ | Analog Devices Inc./Maxim Integrated | 8-TSSOP, 8-MSOP | 1.71V ~ 5.5V | 200µA @ 1.71V ~ 5.5V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | ROHS3 Compliant |
| DS1339U-3+T&R | Analog Devices Inc./Maxim Integrated | 8-TSSOP, 8-MSOP | 2.7V ~ 5.5V | 150µA @ 3.3V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | ROHS3 Compliant |
| DS1340C-33#T&R | Analog Devices Inc./Maxim Integrated | 16-SOIC | 2.97V ~ 5.5V | 150µA @ 5.5V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (24 hr) | YY-MM-DD-dd | Leap Year, Trickle-Charger | ROHS3 Compliant |
| DS1340Z-33+ | Analog Devices Inc./Maxim Integrated | 8-SOIC | 2.97V ~ 5.5V | 150µA @ 5.5V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (24 hr) | YY-MM-DD-dd | Leap Year, Trickle-Charger | ROHS3 Compliant |
| ISL12022MIBZ | Renesas Electronics Corporation | 20-SOIC | 2.7V ~ 5.5V | 14µA ~ 15µA @ 3V ~ 5V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Daylight Savings, Leap Year, SRAM | ROHS3 Compliant |
| ISL12057IUZ | Renesas Electronics Corporation | 8-TSSOP, 8-MSOP | 1.8V ~ 3.6V | 0.65µA @ 1.8V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year | ROHS3 Compliant |
| ISL12058IRTZ-T | Renesas Electronics Corporation | 8-WDFN Exposed Pad | 1.8V ~ 3.6V | 0.65µA @ 1.8V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year | ROHS3 Compliant |
| ISL12058IUZ | Renesas Electronics Corporation | 8-TSSOP, 8-MSOP | 1.8V ~ 3.6V | 0.65µA @ 1.8V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year | ROHS3 Compliant |
| M41T62LC6F | STMicroelectronics | 8-LCC | 1.3V ~ 4.4V | 0.7µA ~ 0.95µA @ 1.3V ~ 4.4V | -40°C ~ 85°C | I2C, 2-Wire Serial | HH:MM:SS:hh (24 hr) | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Watchdog Timer | ROHS3 Compliant |
Engineering Selection Recommendations
All substitute parts listed maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the RTC-8564JE:B0.
For Direct Pin-Compatible Replacement (20-pin package): ISL12022MIBZ is the only substitute maintaining a 20-pin package configuration (20-SOIC). This part provides the closest mechanical compatibility with the original RTC-8564JE:B0 design, requiring minimal PCB layout modifications. Supply voltage range (2.7V ~ 5.5V) overlaps the original specification, though the lower bound is 0.9V higher. Timekeeping current consumption (14µA ~ 15µA) is higher than the original but remains within acceptable limits for most applications.
For Low-Power Battery-Backed Applications: ISL12057IUZ, ISL12058IRTZ-T, and ISL12058IUZ deliver superior timekeeping current performance (0.65µA @ 1.8V), outperforming the original specification. These parts are suitable for battery-powered designs where extended runtime is critical. Supply voltage range (1.8V ~ 3.6V) is narrower than the original, limiting use in systems requiring 5V operation.
For Extended Supply Voltage Range: DS1339AU+, DS1339U-3+T&R, DS1340C-33#T&R, and DS1340Z-33+ support supply voltages up to 5.5V, matching the original upper limit. DS1339 variants include square wave output capability, adding functional flexibility. DS1340 variants feature trickle-charger functionality for battery backup applications.
For Minimal Design Changes: M41T62LC6F (STMicroelectronics Timekeeper® series) delivers timekeeping current (0.7µA ~ 0.95µA) nearly identical to the original RTC-8564JE:B0 and supports an extended lower supply voltage bound (1.3V). This part is suitable for designs requiring minimal performance deviation from the original specification.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with a different package type in my existing PCB design?
A: Package changes require PCB layout modifications. ISL12022MIBZ (20-SOIC) is the only substitute maintaining the same pin count as the original RTC-8564JE:B0 (20-LSSOJ). Smaller packages (8-pin or 16-pin variants) require redesigned footprints and may necessitate schematic changes if pin assignments differ. Consult the datasheet pinout diagrams for each substitute before layout modifications.
Q: What is the impact of using a substitute with lower timekeeping current consumption?
A: Lower timekeeping current (such as 0.65µA in ISL12057IUZ, ISL12058IRTZ-T, and ISL12058IUZ versus 0.7µA ~ 0.8µA in the original) extends battery backup runtime in applications with coin-cell or supercapacitor backup. This is a functional improvement with no negative impact on system operation.
Q: Are all substitute parts compatible with 5V supply voltage systems?
A: No. ISL12057IUZ, ISL12058IRTZ-T, and ISL12058IUZ support only 1.8V ~ 3.6V supply range and are not suitable for 5V-only systems. AB1805-T3 supports 1.7V ~ 3.6V. For 5V compatibility, select from DS1339AU+, DS1339U-3+T&R, DS1340C-33#T&R, DS1340Z-33+, ISL12022MIBZ, or M41T62LC6F.
Q: Do all substitute parts support the same alarm and timekeeping features as the RTC-8564JE:B0?
A: All substitute parts support I2C interface, -40°C ~ 85°C operating range, and alarm functionality. The original RTC-8564JE:B0 includes Y2K support. Most substitutes include Leap Year support, which provides equivalent date handling capability. Consult individual datasheets for feature-specific implementation details.
Q: What is the significance of ROHS3 compliance across all parts?
A: ROHS3 compliance confirms that all substitute parts meet Restriction of Hazardous Substances Directive requirements, ensuring regulatory alignment with the original RTC-8564JE:B0. This compliance status supports use in applications subject to environmental and safety regulations across multiple jurisdictions.
Q: Can I use a substitute part with a narrower supply voltage range in a multi-voltage system?
A: Substitutes with narrower supply ranges (such as 1.8V ~ 3.6V) are suitable only if your system operates entirely within that range. If your design requires operation across the original 1.8V ~ 5.5V range, select substitutes supporting the full range: DS1339AU+, DS1339U-3+T&R, DS1340C-33#T&R, DS1340Z-33+, ISL12022MIBZ, or M41T62LC6F.
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