RTC-8564NBB0 Equivalent & Substitute Parts

Part Overview

The RTC-8564NBB0 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by EPSON. This Surface Mount device operates via I2C 2-Wire Serial interface and is housed in a 22-SMD, 20 Leads package with Flat Leads. The part is currently Active in product status with 1054 units in stock. The RTC-8564NBB0 provides timekeeping with alarm and Y2K features, operating across a wide supply voltage range of 1.8V to 5.5V with minimal current consumption during timekeeping mode. Equivalent and substitute parts are identified based on matching functional requirements, interface compatibility, operating temperature range, and package form factor suitability for direct circuit board replacement or functional equivalence in system design.

Key Parameters

Parameter	RTC-8564NBB0
Manufacturer	EPSON
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Voltage - Supply	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-SMD, 20 Leads, Flat Leads
Time Format	HH:MM:SS
Date Format	YY-MM-DD-dd
Features	Alarm, Y2K
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the RTC-8564NBB0 are selected based on the following critical parameters:

Interface Compatibility: All substitute parts must support I2C 2-Wire Serial communication to ensure firmware and circuit compatibility without redesign.

Operating Temperature Range: Substitutes must maintain the -40°C to 85°C operating range to support equivalent environmental specifications.

Supply Voltage Range: Substitutes must operate within or encompass the 1.8V to 5.5V supply voltage window. Parts with narrower ranges (such as 2.7V minimum or 4.5V minimum) represent functional constraints in low-voltage applications.

Timekeeping Current: The RTC-8564NBB0 operates at 0.7µA to 0.8µA during timekeeping. Substitute parts with significantly higher current consumption (100µA or greater) indicate different power management architectures and may not be suitable for battery-backed applications requiring extended runtime.

Mounting Type and Package Form Factor: All substitutes are Surface Mount devices. Package differences (8-SOIC, 8-MSOP, 16-SOIC, 16-QFN) represent physical layout constraints and require PCB redesign for direct substitution.

Product Status and Compliance: Active status parts are preferred. Obsolete parts (such as ISL1218IUZ) are identified for awareness but represent end-of-life risk.

Parameter Comparison

Parameter	RTC-8564NBB0	DS1338C-33#T&R	DS1340Z-18+	DS1388Z-5+	ISL12022IBZ-T7A	ISL12057IUZ	ISL1208IU8Z-T7A	ISL1218IUZ	M41T0M6F	M41T83ZQA6F	MCP79400T-I/MS
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	I2C, 2-Wire Serial
Voltage - Supply	1.8V ~ 5.5V	3V ~ 5.5V	1.71V ~ 5.5V	4.5V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 3.6V	2.7V ~ 5.5V	2.7V ~ 5.5V	2V ~ 5.5V	2.38V ~ 5.5V	1.8V ~ 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	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Time Format	HH:MM:SS	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS:hh (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:MM:SS:hh (24 hr)	HH:MM:SS (12/24 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	YY-MM-DD-dd
Current - Timekeeping (Max)	0.7µA ~ 0.8µA @ 3V ~ 5V	125µA ~ 200µA @ 3.63V ~ 5.5V	100µA @ 1.89V	270µA @ 4.5V ~ 5.5V	14µA ~ 15µA @ 3V ~ 5V	0.65µA @ 1.8V	4µA ~ 6µA @ 3V ~ 5V	4µA ~ 6µA @ 3V ~ 5V	1.2µA ~ 31µA @ 3V ~ 5.5V	10µA @ 5.5V	1.2µA (Typ) @ 3.3V
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Obsolete	Active	Active	Active

Engineering Selection Recommendations

Highest Compatibility Substitutes (Minimal Design Impact):

ISL12057IUZ and ISL12022IBZ-T7A represent the closest functional equivalents. ISL12057IUZ operates at 0.65µA timekeeping current, matching the ultra-low power profile of the RTC-8564NBB0. However, ISL12057IUZ supply voltage is limited to 1.8V to 3.6V, restricting use in 5V-only systems. ISL12022IBZ-T7A supports 2.7V to 5.5V supply range with 14µA to 15µA timekeeping current and includes SRAM and Daylight Savings features. Both parts are Active status and ROHS3 compliant.

Moderate Compatibility Substitutes (Package Redesign Required):

MCP79400T-I/MS (Microchip Technology) operates at 1.2µA typical timekeeping current across 1.8V to 5.5V supply range, matching the RTC-8564NBB0 voltage envelope. This part includes 64B SRAM, Alarm, Leap Year, and Square Wave Output features. M41T0M6F (STMicroelectronics) supports 2V to 5.5V with 1.2µA to 31µA timekeeping current range and is Active status. Both require PCB layout changes due to different package form factors (8-MSOP and 8-SOIC respectively versus 22-SMD).

Limited Compatibility Substitutes (Functional Constraints):

DS1340Z-18+ operates at 100µA timekeeping current, representing a 125-fold increase in power consumption compared to the RTC-8564NBB0. DS1388Z-5+ requires 4.5V minimum supply voltage and draws 270µA during timekeeping, unsuitable for low-voltage or battery-backed applications. ISL1218IUZ is marked Obsolete and represents end-of-life risk despite technical compatibility.

Compliance and Certification:

All Active status substitutes maintain ROHS3 compliance and -40°C to 85°C operating temperature range. Parts with REACH Unaffected status (Analog Devices, Renesas, STMicroelectronics, Microchip) present no additional regulatory burden compared to the RTC-8564NBB0 (REACH Affected).

Frequently Asked Questions (FAQ)

Q: Can DS1338C-33#T&R directly replace RTC-8564NBB0 on the same PCB?

A: No. DS1338C-33#T&R uses 16-SOIC package versus RTC-8564NBB0's 22-SMD package. Physical footprint redesign is required. Additionally, DS1338C-33#T&R supply voltage minimum is 3V, restricting operation below this threshold where RTC-8564NBB0 functions at 1.8V.

Q: Which substitute offers the lowest timekeeping current?

A: ISL12057IUZ operates at 0.65µA at 1.8V, lower than RTC-8564NBB0's 0.7µA to 0.8µA range. However, ISL12057IUZ maximum supply voltage is 3.6V, limiting use in 5V systems. For 5V-compatible operation, MCP79400T-I/MS and M41T0M6F offer 1.2µA typical timekeeping current.

Q: Is ISL1218IUZ suitable for new designs?

A: No. ISL1218IUZ is marked Obsolete product status, indicating end-of-life. New designs should select Active status alternatives such as ISL12022IBZ-T7A or ISL12057IUZ from the Renesas ISL series.

Q: What is the primary difference between ISL12022IBZ-T7A and ISL12057IUZ?

A: ISL12057IUZ operates at lower supply voltage (1.8V to 3.6V) with 0.65µA timekeeping current but lacks SRAM. ISL12022IBZ-T7A supports wider supply range (2.7V to 5.5V) with 128B SRAM and 14µA to 15µA timekeeping current, including Daylight Savings feature.

Q: Can M41T83ZQA6F replace RTC-8564NBB0 functionally?

A: M41T83ZQA6F provides Clock/Calendar functionality with I2C interface and -40°C to 85°C operating range. However, it uses 16-VQFN package requiring PCB redesign. Timekeeping current is 10µA at 5.5V, higher than RTC-8564NBB0. Supply voltage range is 2.38V to 5.5V, narrower at the low end.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance matching the RTC-8564NBB0 environmental standard.

Q: Which substitute is recommended for battery-backed timekeeping applications?

A: ISL12057IUZ (0.65µA) and ISL12022IBZ-T7A (14µA to 15µA) are optimized for battery operation. ISL12057IUZ offers superior power efficiency but is limited to 3.6V maximum. For systems requiring 5V operation with battery backup, ISL12022IBZ-T7A is preferred despite higher current consumption.

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