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PCF8523TS/1,112 Real Time Clock IC – Equivalent & Substitute Parts
Part Overview
The PCF8523TS/1,112 is a Real Time Clock (RTC) IC manufactured by NXP USA Inc., designed for clock/calendar applications with I2C 2-Wire Serial interface. This device operates across a wide supply voltage range (1.6V to 5.5V) and includes integrated alarm, leap year, and watchdog timer functionality. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.
Substiute Parts
Key Parameters
| Parameter | PCF8523TS/1,112 |
|---|---|
| Manufacturer | NXP USA Inc. |
| Package / Case | 14-TSSOP (0.173", 4.40mm Width) |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Voltage - Supply | 1.6V ~ 5.5V |
| Voltage - Supply, Battery | 1.8V ~ 5.5V |
| Current - Timekeeping (Max) | 0.5µA @ 2V ~ 5V |
| Operating Temperature | -40°C ~ 85°C |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year, Watchdog Timer |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the PCF8523TS/1,112 is determined by the following critical parameters:
Interface Compatibility: All substitute parts must support I2C 2-Wire Serial communication to maintain firmware and circuit compatibility.
Voltage Supply Range: The PCF8523TS/1,112 operates from 1.6V to 5.5V. Substitute parts must support overlapping or equivalent supply voltage ranges to function in the same power domain.
Operating Temperature Range: The device operates from -40°C to 85°C. Substitute parts must meet or exceed this temperature specification.
Time and Date Format: All substitutes must support HH:MM:SS (12/24 hour) time format and YY-MM-DD-dd date format for register-level compatibility.
Functional Features: Core features (Alarm, Leap Year support) are essential for application compatibility. Additional features such as NVSRAM, Square Wave Output, or Trickle-Charger may be present in substitutes without affecting basic functionality.
Package Consideration: While the PCF8523TS/1,112 uses a 14-TSSOP package, substitute parts in smaller packages (8-TSSOP, 8-MSOP, 8-SOIC, 16-SOIC) are acceptable if PCB layout permits redesign.
Compliance: All substitutes must maintain ROHS3 compliance and EAR99 export classification.
Parameter Comparison
| Part Number | Manufacturer | Package | Supply Voltage | Battery Voltage | Timekeeping Current (Max) | Operating Temp | Interface | Time Format | Date Format | Features | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| PCF8523TS/1,112 | NXP USA Inc. | 14-TSSOP | 1.6V ~ 5.5V | 1.8V ~ 5.5V | 0.5µA @ 2V ~ 5V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year, Watchdog Timer | Obsolete |
| 1338-31DVGI | Renesas Electronics | 8-MSOP | 3.3V ~ 5.5V | 1.3V ~ 3.7V | 5µA @ 3.63V ~ 5.5V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | Active |
| BQ32000DR | Texas Instruments | 8-SOIC | 3V ~ 3.6V | 1.4V ~ 3.6V | 100µA @ 3.3V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (24 hr) | YY-MM-DD-dd | Leap Year, Square Wave Output, Trickle-Charger | Active |
| DS1307Z+ | Analog Devices Inc./Maxim | 8-SOIC | 4.5V ~ 5.5V | 2V ~ 4.6V | 200µA @ 5V | 0°C ~ 70°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | Active |
| DS1337U+T&R | Analog Devices Inc./Maxim | 8-TSSOP | 1.8V ~ 5.5V | — | 0.6µA @ 1.3V ~ 1.8V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output | Active |
| DS1338C-3# | Analog Devices Inc./Maxim | 16-SOIC | 2.7V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.3V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | Active |
| DS1338U-18+T&R | Analog Devices Inc./Maxim | 8-TSSOP | 1.71V ~ 5.5V | 1.3V ~ 3.7V | 100µA @ 1.89V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | Active |
| DS1338U-3+T&R | Analog Devices Inc./Maxim | 8-TSSOP | 2.7V ~ 5.5V | 1.3V ~ 3.7V | 200µA @ 3.3V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Leap Year, NVSRAM, Square Wave Output | Active |
| DS1339U-2+T&R | Analog Devices Inc./Maxim | 8-TSSOP | 1.8V ~ 5.5V | 1.3V ~ 3.7V | 100µA @ 2.2V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (12/24 hr) | YY-MM-DD-dd | Alarm, Leap Year, Square Wave Output, Trickle-Charger | Active |
| DS1340U-33+T&R | Analog Devices Inc./Maxim | 8-TSSOP | 2.97V ~ 5.5V | 1.3V ~ 5.5V | 150µA @ 5.5V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (24 hr) | YY-MM-DD-dd | Leap Year, Trickle-Charger | Active |
| DS1340Z-3+ | Analog Devices Inc./Maxim | 8-SOIC | 2.7V ~ 5.5V | 1.3V ~ 3.7V | 125µA @ 3.3V | -40°C ~ 85°C | I2C, 2-Wire | HH:MM:SS (24 hr) | YY-MM-DD-dd | Leap Year, Trickle-Charger | Active |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
DS1337U+T&R and DS1338U-18+T&R are the most direct substitutes. Both support the full 1.8V to 5.5V supply voltage range of the PCF8523TS/1,112, maintain -40°C to 85°C operating temperature, and provide I2C 2-Wire Serial interface with 12/24-hour time format and YY-MM-DD-dd date format. DS1337U+T&R includes alarm functionality matching the original part. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).
Secondary Substitutes (Voltage Range Considerations):
DS1338U-3+T&R operates from 2.7V to 5.5V, which covers most applications but excludes the lower 1.6V to 2.7V range of the original part. DS1339U-2+T&R operates from 1.8V to 5.5V and includes alarm and trickle-charger features. Both maintain full temperature and interface compatibility.
Limited Substitutes (Restricted Voltage or Temperature):
DS1307Z+ operates from 4.5V to 5.5V (main supply) and 0°C to 70°C, restricting use in low-voltage or extended low-temperature applications. BQ32000DR operates from 3V to 3.6V (main supply), limiting compatibility to 3.3V systems. These parts are suitable only for applications within their specified voltage and temperature ranges.
Package Transition Considerations:
The original PCF8523TS/1,112 uses 14-TSSOP packaging. Substitutes in 8-TSSOP, 8-MSOP, or 8-SOIC packages require PCB redesign but offer reduced footprint. The 16-SOIC DS1338C-3# maintains larger package dimensions similar to the original.
All listed substitutes maintain ROHS3 compliance, EAR99 export classification, and HTSUS code 8542.39.0001 consistency with the original part.
Frequently Asked Questions (FAQ)
Q: Can DS1307Z+ replace PCF8523TS/1,112 in all applications?
A: No. DS1307Z+ operates from 4.5V to 5.5V main supply and 0°C to 70°C, which excludes applications requiring 1.6V to 4.5V operation or temperatures below 0°C or above 70°C. Use DS1307Z+ only in 5V systems within the 0°C to 70°C range.
Q: What is the key difference between DS1337U+T&R and DS1338U-18+T&R?
A: DS1337U+T&R operates from 1.8V to 5.5V with 0.6µA timekeeping current and includes alarm functionality. DS1338U-18+T&R operates from 1.71V to 5.5V with 100µA timekeeping current and includes NVSRAM (56 bytes) and square wave output. Both support 12/24-hour time format and -40°C to 85°C operation. Choose DS1337U+T&R for ultra-low power applications; choose DS1338U-18+T&R for applications requiring non-volatile RAM.
Q: Is package size a critical substitution factor?
A: Package size is not a functional substitution factor but a design constraint. The PCF8523TS/1,112 uses 14-TSSOP. Substitutes in 8-TSSOP, 8-MSOP, or 8-SOIC packages are functionally equivalent but require PCB layout modification. Verify PCB space availability before selecting smaller packages.
Q: Do all substitutes support 12/24-hour time format?
A: No. BQ32000DR, DS1340U-33+T&R, and DS1340Z-3+ support 24-hour format only. If your application requires 12-hour format, select from DS1337U+T&R, DS1338 variants, DS1339U-2+T&R, or 1338-31DVGI.
Q: Which substitute has the lowest timekeeping current?
A: DS1337U+T&R draws 0.6µA at 1.3V to 1.8V, the lowest among all listed substitutes. PCF8523TS/1,112 draws 0.5µA at 2V to 5V. For battery-backed timekeeping applications, DS1337U+T&R is the most power-efficient substitute.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant and maintain EAR99 export classification, consistent with the original PCF8523TS/1,112.
Q: Can I use 1338-31DVGI in a 1.6V to 3.3V application?
A: No. 1338-31DVGI operates from 3.3V to 5.5V main supply. It is not suitable for applications below 3.3V. Use DS1337U+T&R or DS1338U-18+T&R for low-voltage operation.
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