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PCF85263ATT1/AJ Real Time Clock IC Equivalent & Substitute Parts
Part Overview
The PCF85263ATT1/AJ is a Real Time Clock (RTC) IC with Clock/Calendar functionality, I2C 2-Wire Serial interface, and integrated alarm, leap year, and watchdog timer features. Manufactured by NXP Semiconductors, this component operates across a wide supply voltage range of 0.9V to 5.5V with ultra-low timekeeping current of 0.885µA at 3.3V. The part is classified as Obsolete, making equivalent and substitute components necessary for new designs and ongoing production support.
Substiute Parts
Key Parameters
| Parameter | PCF85263ATT1/AJ |
|---|---|
| Manufacturer | NXP Semiconductors |
| Product Status | Obsolete |
| Type | Clock/Calendar |
| Interface | I2C, 2-Wire Serial |
| Voltage Supply Range | 0.9V ~ 5.5V |
| Voltage Supply Battery | 0.9V ~ 5.5V |
| Current Timekeeping (Max) | 0.885µA @ 3.3V |
| Operating Temperature | -40°C ~ 85°C |
| Time Format | HH:MM:SS:hh (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year, Watchdog Timer |
| Package | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the PCF85263ATT1/AJ 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: Substitute parts must operate within the 0.9V to 5.5V supply range or a subset thereof. Parts with narrower voltage ranges (such as 1.5V ~ 3.6V) are acceptable if the application operates within that range.
Operating Temperature: All substitutes must support the -40°C to 85°C operating temperature range.
Time and Date Format: Substitute parts must support 12/24-hour time format and YY-MM-DD-dd date format.
Core Features: Alarm, Leap Year, and Watchdog Timer functionality must be present in substitute parts.
Package Compatibility: While the original part uses 10-TFSOP packaging, substitute parts in different packages (8-SOIC, 8-WCDFN, 16-SOIC, or Module) are acceptable if circuit board layout can accommodate the physical differences.
Product Status: Active status substitutes are preferred for new designs; parts marked "Not For New Designs" are acceptable only for legacy system maintenance.
Parameter Comparison
| Parameter | PCF85263ATT1/AJ | PCF85263ATT1/AZ | AB-RTCMC-32.768KHZ-AIGZ-S7-T | AB-RTCMC-32.768KHZ-IBO5-S3-T | BQ32002D | DS1337S+T&R | DS1338C-33#T&R | DS1388Z-3+ | DS1388Z-33+T&R | DS1388Z-5+ | DS3231M+ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | NXP Semiconductors | NXP USA Inc. | Abracon LLC | Abracon LLC | Texas Instruments | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim |
| Product Status | Obsolete | Active | Active | Not For New Designs | Active | Active | Active | Active | Active | Active | Active |
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar |
| Interface | I2C, 2-Wire Serial | I2C | 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 Range | 0.9V ~ 5.5V | 0.9V ~ 1.8V, 0.9V ~ 5.5V | 1V ~ 4.4V | 1.5V ~ 3.6V | 3V ~ 3.6V | 1.8V ~ 5.5V | 3V ~ 5.5V | 2.7V ~ 3.3V | 2.97V ~ 3.63V | 4.5V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage Supply Battery | 0.9V ~ 5.5V | 0.9V ~ 5.5V | — | 1.4V ~ 3.6V | 1.4V ~ 3.6V | — | 1.3V ~ 3.7V | 1.3V ~ 5.5V | 1.3V ~ 5.5V | 1.3V ~ 5.5V | 2.3V ~ 5.5V |
| Current Timekeeping (Max) | 0.885µA @ 3.3V | 0.885µA @ 3.3V | 0.4µA ~ 0.95µA @ 1V ~ 4.4V | 0.29µA ~ 0.33µA @ 1.8V ~ 3V | 200µA @ 3.3V | 0.6µA @ 1.3V ~ 1.8V | 125µA ~ 200µA @ 3.63V ~ 5.5V | 140µA @ 2.7V ~ 3.3V | 150µA @ 2.97V ~ 3.63V | 270µA @ 4.5V ~ 5.5V | 130µA ~ 200µA @ 3.63V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C (TA) | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C (TA) | -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:hh (12/24 hr) | HH:MM:SS:hh (12/24 hr) | HH:MM:SS:hh (24 hr) | HH:MM:SS:hh (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS:hh (12/24 hr) | HH:MM:SS:hh (12/24 hr) | HH:MM:SS:hh (12/24 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 |
| Features | Alarm, Leap Year, Watchdog Timer | Alarm, Leap Year, Watchdog Timer | Alarm, Leap Year, Watchdog Timer | Alarm, Square Wave Output, SRAM, Trickle Charge, Watchdog Timer | Leap Year, Square Wave Output, Trickle-Charger | Alarm, Leap Year, Square Wave Output | Leap Year, NVSRAM, Square Wave Output | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | Alarm, Leap Year, Square Wave Output |
| Package | 10-TFSOP, 10-MSOP | 10-TFSOP, 10-MSOP | 8-WCDFN | Module | 8-SOIC | 8-SOIC | 16-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 16-SOIC |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) |
Engineering Selection Recommendations
Direct Replacement (Same Package): PCF85263ATT1/AZ is the primary direct substitute for PCF85263ATT1/AJ. Both parts share identical 10-TFSOP packaging, I2C interface, and core feature set. PCF85263ATT1/AZ carries Active product status and maintains the same voltage supply range (0.9V ~ 5.5V), timekeeping current (0.885µA @ 3.3V), and operating temperature range. This part is qualified to AEC-Q100 automotive standard, providing enhanced reliability for demanding applications.
Alternative Substitutes (Different Packages): When circuit board redesign is acceptable, the following parts provide functional equivalence with different package footprints:
DS1388Z-33+T&R and DS1388Z-5+ (Analog Devices Inc./Maxim Integrated) offer 512B memory, EEPROM, supervisor, and trickle-charger features in 8-SOIC packaging. These parts are Active status and support the required I2C interface and operating temperature range. DS1388Z-33+T&R operates at 2.97V ~ 3.63V, while DS1388Z-5+ operates at 4.5V ~ 5.5V; selection depends on application supply voltage.
DS1337S+T&R (Analog Devices Inc./Maxim Integrated) provides alarm, leap year, and square wave output in 8-SOIC packaging with a wide supply range of 1.8V ~ 5.5V and ultra-low timekeeping current of 0.6µA at 1.3V ~ 1.8V. This part is suitable for battery-backed applications.
AB-RTCMC-32.768KHZ-AIGZ-S7-T (Abracon LLC) operates at 1V ~ 4.4V in 8-WCDFN packaging with low timekeeping current of 0.4µA ~ 0.95µA. This part is Active status and suitable for low-power applications.
Legacy Applications: AB-RTCMC-32.768KHZ-IBO5-S3-T is marked "Not For New Designs" and is suitable only for maintaining existing systems that already incorporate this component.
Compliance: All substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements equivalent to the original PCF85263ATT1/AJ.
Frequently Asked Questions (FAQ)
Q: Can PCF85263ATT1/AZ be used as a direct drop-in replacement for PCF85263ATT1/AJ?
A: Yes. PCF85263ATT1/AZ is a direct substitute with identical packaging (10-TFSOP), I2C interface, voltage supply range (0.9V ~ 5.5V), timekeeping current (0.885µA @ 3.3V), and operating temperature range (-40°C ~ 85°C). The primary difference is product status: PCF85263ATT1/AZ is Active, while the original is Obsolete. No circuit modifications are required.
Q: What are the key differences between 8-SOIC and 10-TFSOP packages?
A: 8-SOIC (0.154" × 3.90mm width) and 10-TFSOP (0.118" × 3.00mm width) are different surface-mount packages with different pin counts and footprints. Substituting between these packages requires circuit board redesign and PCB layout modifications. Pin assignments and electrical connections must be verified against each part's datasheet.
Q: Which substitute part has the lowest timekeeping current?
A: AB-RTCMC-32.768KHZ-IBO5-S3-T has the lowest timekeeping current at 0.29µA ~ 0.33µA @ 1.8V ~ 3V. However, this part is marked "Not For New Designs." For new designs, DS1337S+T&R offers 0.6µA @ 1.3V ~ 1.8V, and AB-RTCMC-32.768KHZ-AIGZ-S7-T offers 0.4µA ~ 0.95µA @ 1V ~ 4.4V.
Q: Are all substitute parts I2C compatible?
A: Yes. All listed substitute parts support I2C 2-Wire Serial communication, ensuring firmware and circuit compatibility with applications designed for the PCF85263ATT1/AJ.
Q: What is the significance of AEC-Q100 qualification on PCF85263ATT1/AZ?
A: AEC-Q100 qualification indicates that PCF85263ATT1/AZ meets automotive industry reliability and quality standards. This certification is relevant for applications requiring automotive-grade components but is not mandatory for general industrial or consumer applications.
Q: Can I use DS1388Z parts as substitutes if my application requires 512B memory?
A: Yes. DS1388Z-3+, DS1388Z-33+T&R, and DS1388Z-5+ all include 512B memory with EEPROM, supervisor, and trickle-charger features. However, these parts have different voltage supply ranges: DS1388Z-3+ operates at 2.7V ~ 3.3V, DS1388Z-33+T&R at 2.97V ~ 3.63V, and DS1388Z-5+ at 4.5V ~ 5.5V. Select based on your application's supply voltage.
Q: What is the MSL rating difference between PCF85263ATT1/AJ and DS3231M+?
A: PCF85263ATT1/AJ and most substitute parts have MSL 1 (Unlimited), meaning they can be stored indefinitely without moisture sensitivity concerns. DS3231M+ has MSL 3 (168 Hours), requiring moisture control during storage and handling. For applications with extended storage periods, MSL 1 rated parts are preferred.
Q: Is the 24-hour time format limitation of some parts a compatibility issue?
A: Parts supporting only 24-hour format (BQ32002D, AB-RTCMC-32.768KHZ-AIGZ-S7-T, AB-RTCMC-32.768KHZ-IBO5-S3-T) are compatible with applications that do not require 12-hour format. If your firmware or application specifically requires 12/24-hour switchable format, select parts explicitly supporting both formats: PCF85263ATT1/AZ, DS1337S+T&R, DS1338C-33#T&R, DS1388Z series, or DS3231M+.
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