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RTC-8564NB:BB ROHS Equivalent & Substitute Parts
Part Overview
The RTC-8564NB:BB is an active-status Real Time Clock (RTC) IC manufactured by EPSON, designed for clock/calendar applications requiring I2C serial communication. This 22-LFDFN surface-mount device operates across a wide supply voltage range of 1.8V to 5.5V with ultra-low timekeeping current consumption of 0.7µA to 0.8µA at 3V to 5V. The part provides time format HH:MM:SS and date format YY-MM-DD-dd with integrated alarm functionality. Substitute parts are identified to address inventory availability, alternative packaging requirements, or specific feature requirements while maintaining functional and electrical compatibility within the defined parameter constraints.
Substiute Parts
Key Parameters
| Parameter | RTC-8564NB:BB |
|---|---|
| Manufacturer | EPSON |
| Category | Clock/Timing |
| Type | Clock/Calendar |
| Interface | I2C |
| Time Format | HH:MM:SS |
| Date Format | YY-MM-DD-dd |
| Voltage Supply Range | 1.8V ~ 5.5V |
| Current - Timekeeping (Max) | 0.7µA ~ 0.8µA @ 3V ~ 5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 22-LFDFN |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the RTC-8564NB:BB are grouped based on the following substitution criteria:
Primary Compatibility Parameters:
- Interface: I2C or I2C with 2-Wire Serial
- Time Format: HH:MM:SS (12/24 hr or 24 hr)
- Date Format: YY-MM-DD-dd
- Operating Temperature: -40°C ~ 85°C
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Product Status: Active
Substitution Logic: Parts are considered equivalent when they maintain I2C communication protocol, support the same time and date formats, operate within the -40°C to 85°C temperature range, and comply with ROHS3 standards. Voltage supply range compatibility is evaluated individually. Package differences (22-LFDFN vs. 8-SOIC, 8-TSSOP, 16-SOIC, or Module) are acceptable substitutes provided the application PCB layout can accommodate the alternative form factor. Current consumption variations are noted but do not disqualify substitution when the part meets the primary electrical and functional criteria.
Parameter Comparison
| Part Number | Manufacturer | Interface | Time Format | Date Format | Voltage Supply | Current - Timekeeping (Max) | Operating Temp | Package / Case | RoHS Status | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| RTC-8564NB:BB | EPSON | I2C | HH:MM:SS | YY-MM-DD-dd | 1.8V ~ 5.5V | 0.7µA ~ 0.8µA @ 3V ~ 5V | -40°C ~ 85°C | 22-LFDFN | ROHS3 Compliant | Active |
| 1338-31DCGI | Renesas Electronics Corporation | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 3.3V ~ 5.5V | 5µA @ 3.63V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant | Active |
| AB-RTCMC-32.768KHZ-B5GA-S3-T | Abracon LLC | I2C, 2-Wire Serial | HH:MM:SS (24 hr) | YY-MM-DD-dd | 1.2V ~ 5.5V | 0.45µA ~ 0.55µA @ 2V ~ 5V | -40°C ~ 85°C | 10-SMD Module | ROHS3 Compliant | Active |
| DS1338Z-3+T&R | Analog Devices Inc./Maxim Integrated | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 2.7V ~ 5.5V | 200µA @ 3.3V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant | Active |
| DS1338Z-33+T&R | Analog Devices Inc./Maxim Integrated | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 3V ~ 5.5V | 125µA ~ 200µA @ 3.63V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant | Active |
| DS1339AU+ | Analog Devices Inc./Maxim Integrated | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 1.71V ~ 5.5V | 200µA @ 1.71V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | ROHS3 Compliant | Active |
| DS1339BU+ | Analog Devices Inc./Maxim Integrated | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 1.71V ~ 5.5V | 200µA @ 1.71V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | ROHS3 Compliant | Active |
| DS1340U-33+ | Analog Devices Inc./Maxim Integrated | I2C, 2-Wire Serial | HH:MM:SS (24 hr) | YY-MM-DD-dd | 2.97V ~ 5.5V | 150µA @ 5.5V | -40°C ~ 85°C | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | ROHS3 Compliant | Active |
| DS1340Z-33+ | Analog Devices Inc./Maxim Integrated | I2C, 2-Wire Serial | HH:MM:SS (24 hr) | YY-MM-DD-dd | 2.97V ~ 5.5V | 150µA @ 5.5V | -40°C ~ 85°C | 8-SOIC (0.154", 3.90mm Width) | ROHS3 Compliant | Active |
| DS3231S#T&R | Analog Devices Inc./Maxim Integrated | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 2.3V ~ 5.5V | 110µA ~ 170µA @ 3.63V ~ 5.5V | 0°C ~ 70°C | 16-SOIC (0.295", 7.50mm Width) | ROHS3 Compliant | Active |
| ISL12057IUZ | Renesas Electronics Corporation | I2C, 2-Wire Serial | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | 1.8V ~ 3.6V | 0.65µA @ 1.8V | -40°C ~ 85°C | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | ROHS3 Compliant | Active |
Engineering Selection Recommendations
All listed substitute parts maintain active product status and ROHS3 compliance, meeting the core regulatory and availability requirements for the RTC-8564NB:BB.
Voltage Supply Compatibility: The AB-RTCMC-32.768KHZ-B5GA-S3-T (Abracon LLC) offers the lowest minimum supply voltage at 1.2V and maintains ultra-low timekeeping current (0.45µA ~ 0.55µA), making it suitable for battery-backed applications. The ISL12057IUZ (Renesas) operates at 1.8V minimum with 0.65µA timekeeping current, aligning closely with the RTC-8564NB:BB performance envelope. Parts with higher minimum voltage requirements (DS1338Z series at 2.7V ~ 3V, DS1340 series at 2.97V, DS3231S at 2.3V) are suitable for systems with regulated 3.3V or 5V supplies.
Operating Temperature Range: The DS3231S#T&R operates within 0°C ~ 70°C, a narrower range than the RTC-8564NB:BB (-40°C ~ 85°C). This part is suitable only for applications with controlled thermal environments. All other substitutes maintain the full -40°C ~ 85°C operating range.
Package Considerations: The RTC-8564NB:BB uses a 22-LFDFN package. Substitutes employ alternative packages: 8-SOIC, 8-TSSOP/8-MSOP, 16-SOIC, or 10-SMD Module. Package selection depends on PCB layout constraints and available board space. Smaller packages (8-SOIC, 8-TSSOP/8-MSOP) reduce footprint but require design verification for pin compatibility and signal routing.
Current Consumption: The AB-RTCMC-32.768KHZ-B5GA-S3-T and ISL12057IUZ deliver the lowest timekeeping current, optimizing battery life in portable or remote applications. The DS1338Z and DS1339/DS1340 series exhibit higher current consumption (125µA ~ 200µA), suitable for mains-powered systems where power efficiency is less critical.
Frequently Asked Questions (FAQ)
Q: Can I substitute the RTC-8564NB:BB with any of these parts directly?
A: Direct substitution depends on package compatibility and PCB layout. All listed parts share I2C communication, time/date format support, and operating temperature range. However, the 22-LFDFN package of the RTC-8564NB:BB differs from substitute packages. PCB redesign or adapter solutions may be required for alternative packages.
Q: Which substitute offers the best power efficiency?
A: The AB-RTCMC-32.768KHZ-B5GA-S3-T (0.45µA ~ 0.55µA @ 2V ~ 5V) and ISL12057IUZ (0.65µA @ 1.8V) provide the lowest timekeeping current consumption, making them optimal for battery-backed or ultra-low-power applications.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 Compliant certification, matching the RTC-8564NB:BB compliance status.
Q: What is the voltage supply constraint for substitution?
A: The RTC-8564NB:BB operates at 1.8V ~ 5.5V. Substitutes with overlapping or wider voltage ranges are compatible. The AB-RTCMC-32.768KHZ-B5GA-S3-T (1.2V ~ 5.5V) and ISL12057IUZ (1.8V ~ 3.6V) are compatible. Parts with minimum voltages above 1.8V (DS1338Z at 2.7V ~ 3V, DS1340 at 2.97V) require 3.3V or higher supply systems.
Q: Does the DS3231S#T&R work as a substitute?
A: The DS3231S#T&R is functionally compatible but operates within 0°C ~ 70°C, narrower than the RTC-8564NB:BB (-40°C ~ 85°C). Use this part only in temperature-controlled environments. Its 16-SOIC package also differs from the 22-LFDFN original.
Q: What are the package trade-offs?
A: The 22-LFDFN original is a compact 6.3x4.8mm package. Substitutes use 8-SOIC (0.154" x 3.90mm), 8-TSSOP/8-MSOP (0.118" x 3.00mm), 16-SOIC (0.295" x 7.50mm), or 10-SMD Module packages. Smaller packages reduce board area but require careful signal integrity verification. Larger packages (16-SOIC) increase footprint but may simplify layout routing.
Q: Can I use the DS1338Z series in a 1.8V system?
A: No. The DS1338Z series minimum supply voltage is 2.7V ~ 3V. These parts require 3.3V or 5V regulated supplies and are not suitable for 1.8V systems.
Q: Which substitute has the widest voltage range?
A: The AB-RTCMC-32.768KHZ-B5GA-S3-T operates at 1.2V ~ 5.5V, the widest range among all substitutes, providing maximum flexibility across different supply voltage scenarios.
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