Request Quote
(Ships tomorrow)
RX-8801SA:UB3 PURE SN Equivalent & Substitute Parts
Part Overview
The RX-8801SA:UB3 PURE SN is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by EPSON. This device operates as a 2-Wire Serial I2C interface component in a 14-SOIC package and is currently classified as obsolete. The part supports time and date tracking with alarm and leap year capabilities across a wide supply voltage range of 1.6V to 5.5V, making it suitable for battery-backed and multi-voltage applications. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance.
Substiute Parts
Key Parameters
| Parameter | RX-8801SA:UB3 PURE SN |
|---|---|
| Manufacturer | EPSON |
| Category | Clock/Timing |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Package / Case | 14-SOIC (0.209", 5.30mm Width) |
| Voltage - Supply | 1.6V ~ 5.5V |
| Current - Timekeeping (Max) | 2.8µA ~ 3.4µA @ 3V ~ 5V |
| Operating Temperature | -40°C ~ 85°C |
| Time Format | HH:MM:SS (24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the RX-8801SA:UB3 PURE SN is determined by the following critical parameters:
- Interface compatibility: I2C, 2-Wire Serial protocol
- Supply voltage range: Minimum 1.6V to 5.5V maximum coverage
- Operating temperature range: -40°C to 85°C
- Time and date format support: HH:MM:SS (24 hr) and YY-MM-DD-dd
- Core features: Alarm and Leap Year functionality
- RoHS compliance: ROHS3 Compliant status
- Mounting type: Surface Mount
Substitute parts are grouped into two categories based on package compatibility and electrical characteristics:
Category A: Direct Package Compatibility (14-SOIC) Parts maintaining the 14-SOIC package form factor with equivalent or superior electrical specifications.
Category B: Functional Equivalents (Alternative Packages) Parts providing equivalent I2C RTC functionality with different package options, suitable for redesign scenarios or when package flexibility is acceptable.
Parameter Comparison
| Parameter | RX-8801SA:UB3 | DS1340C-33#T&R | DS1340U-33+ | DS1338U-18+ | DS1339BU+ | DS1342U+ | 1338-31DCGI | AB1805-T3 | DS1337+ | M41T56M6F | M41ST87WSS6F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | EPSON | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Renesas Electronics | Abracon LLC | Analog Devices Inc./Maxim | STMicroelectronics | STMicroelectronics |
| Package / Case | 14-SOIC | 16-SOIC | 8-TSSOP/MSOP | 8-TSSOP/MSOP | 8-TSSOP/MSOP | 8-TSSOP/MSOP | 8-SOIC | 16-VFQFN | 8-DIP | 8-SOIC | 20-SSOP |
| Interface | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire | I2C, 2-Wire |
| Voltage - Supply | 1.6V ~ 5.5V | 2.97V ~ 5.5V | 2.97V ~ 5.5V | 1.71V ~ 5.5V | 1.71V ~ 5.5V | 1.8V ~ 5.5V | 3.3V ~ 5.5V | 1.7V ~ 3.6V | 1.8V ~ 5.5V | 4.5V ~ 5.5V | 2.7V ~ 3.6V |
| 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 |
| Time Format | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (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 | HH:MM:SS (12/24 hr) | HH:MM:SS (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 | YY-MM-DD-dd |
| Features | Alarm, Leap Year | Leap Year, Trickle-Charger | Leap Year, Trickle-Charger | Leap Year, NVSRAM, Square Wave | Alarm, Leap Year, Square Wave, Trickle-Charger | Alarm, Leap Year, Square Wave | Leap Year, NVSRAM, Square Wave | Alarm, Leap Year, SRAM, Trickle-Charger, Watchdog | Alarm, Leap Year, Square Wave | Leap Year, NVSRAM | Alarm, Leap Year, NVSRAM, Square Wave, Supervisor, Watchdog |
| 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 | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility)
DS1340C-33#T&R and DS1340U-33+ are the recommended primary substitutes. Both parts maintain I2C 2-Wire Serial interface compatibility, support 24-hour time format with YY-MM-DD-dd date format, include leap year functionality, and are ROHS3 compliant with active product status. The DS1340C-33#T&R maintains a larger SOIC package (16-SOIC) compared to the original 14-SOIC, while DS1340U-33+ uses an 8-TSSOP/MSOP package. Both support supply voltage ranges that overlap with the original part's requirements and include trickle-charger functionality for enhanced battery backup capability.
Secondary Substitutes (Functional Equivalents)
DS1338U-18+, DS1339BU+, and DS1342U+ provide full I2C RTC functionality with active product status and ROHS3 compliance. These parts support 12/24-hour time formats and include additional features such as NVSRAM and square wave output. DS1339BU+ adds trickle-charger capability. All three operate within compatible temperature ranges and maintain I2C interface compatibility.
Alternative Manufacturers
1338-31DCGI (Renesas Electronics) offers 56B NVSRAM with I2C interface in an 8-SOIC package. M41T56M6F (STMicroelectronics) provides 56B NVSRAM in an 8-SOIC package with active status. M41ST87WSS6F (STMicroelectronics) offers enhanced functionality including supervisor and watchdog timer features in a 20-SSOP package.
Low-Power Alternative
AB1805-T3 (Abracon LLC) is the lowest power option with 0.17µA to 0.22µA timekeeping current at 1.8V to 3V, suitable for ultra-low-power applications. This part includes alarm, leap year, SRAM, trickle-charger, and watchdog timer features in a 16-VFQFN package.
Through-Hole Option
DS1337+ provides a through-hole 8-DIP package alternative for applications requiring non-surface-mount components, with active product status and ROHS3 compliance.
All recommended substitutes maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory compliance.
Frequently Asked Questions (FAQ)
Q: Can DS1340C-33#T&R directly replace RX-8801SA:UB3 PURE SN without PCB modification?
A: DS1340C-33#T&R uses a 16-SOIC package versus the original 14-SOIC package. While both are SOIC form factors with I2C interface compatibility, PCB footprint modification is required. Pin-to-pin compatibility must be verified against device datasheets before implementation.
Q: What is the key difference between DS1340C-33#T&R and DS1340U-33+?
A: Both are DS1340 variants with identical electrical specifications and 24-hour time format support. DS1340C-33#T&R uses a 16-SOIC package, while DS1340U-33+ uses an 8-TSSOP/MSOP package. Selection depends on available PCB space and manufacturing capabilities.
Q: Why does AB1805-T3 have significantly lower timekeeping current than the original part?
A: AB1805-T3 achieves 0.17µA to 0.22µA through advanced low-power design techniques. This lower current consumption extends battery life in battery-backed applications but requires verification that the part's 1.7V to 3.6V supply range is compatible with your system design.
Q: Are all substitute parts I2C compatible with the original RX-8801SA:UB3 PURE SN?
A: All listed substitutes use I2C 2-Wire Serial interface protocol. However, register maps and command structures may differ between manufacturers. Firmware or software modifications may be required to accommodate different device implementations.
Q: Which substitute offers the best feature set for new designs?
A: M41ST87WSS6F provides the most comprehensive feature set including alarm, leap year, NVSRAM, square wave output, supervisor, and watchdog timer functionality. However, it operates within a narrower supply voltage range (2.7V to 3.6V) and requires 20-SSOP package accommodation.
Q: Can I use DS1337+ as a substitute if my application uses through-hole mounting?
A: DS1337+ is the only substitute offering through-hole 8-DIP packaging. It maintains I2C interface compatibility, supports 12/24-hour time format, includes alarm and leap year features, and is ROHS3 compliant with active product status. Verify register compatibility with your firmware before implementation.
Q: What is the supply voltage overlap between RX-8801SA:UB3 PURE SN and available substitutes?
A: The original part supports 1.6V to 5.5V. DS1338U-18+, DS1339BU+, and DS1342U+ support 1.71V to 5.5V, providing near-complete overlap. DS1340 variants support 2.97V to 5.5V, requiring verification for low-voltage applications below 3V.
Q: Are all substitutes suitable for -40°C to 85°C operating temperature range?
A: All listed substitutes support the full -40°C to 85°C operating temperature range, matching the original part's specifications.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts