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PCF2127AT/1,512 Equivalent & Substitute Parts
Part Overview
The PCF2127AT/1,512 is a Real Time Clock (RTC) IC with Clock/Calendar functionality, manufactured by NXP USA Inc. This device integrates 512B of memory with I2C/2-Wire Serial interface, supporting 12/24-hour time format and YY-MM-DD-dd date format. The part operates across 1.8V to 4.2V supply voltage with ultra-low timekeeping current of 1.5µA at 3.3V.
The PCF2127AT/1,512 is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage supply ranges, interface protocols, memory capacity, and operating temperature specifications.
Substiute Parts
Key Parameters
| Parameter | PCF2127AT/1,512 |
|---|---|
| Manufacturer | NXP USA Inc. |
| Type | Clock/Calendar |
| Memory Size | 512B |
| Interface | I2C, 2-Wire Serial |
| Voltage - Supply | 1.8V ~ 4.2V |
| Voltage - Supply, Battery | 1.8V ~ 4.2V |
| Current - Timekeeping (Max) | 1.5µA @ 3.3V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitution logic for the PCF2127AT/1,512 is based on the following critical parameters:
Primary Compatibility Criteria:
- Interface Protocol: I2C, 2-Wire Serial (mandatory match)
- Memory Size: 512B (preferred match for functional equivalence)
- Voltage Supply Range: 1.8V ~ 4.2V (must overlap or encompass)
- Operating Temperature: -40°C ~ 85°C (must match or exceed)
- Time/Date Format: HH:MM:SS (12/24 hr) and YY-MM-DD-dd (functional requirement)
- Package Type: Surface Mount (20-SOIC preferred for pin compatibility)
Substitution Categories:
Category 1: Direct Equivalent (Same Manufacturer, Active Status) PCF2127AT/2Y represents the active production variant of the PCF2127 series with identical electrical specifications, memory capacity, and feature set. This part maintains full functional and pin compatibility with the obsolete PCF2127AT/1,512.
Category 2: Manufacturer-Recommended Alternatives (Different Manufacturers, Active Status) Parts from Analog Devices Inc./Maxim Integrated (DS1307ZN+T&R, DS1341U+T&R, DS1388Z-33+T&R, DS1388Z-5+, DS3231M+TRL, DS3231MZ+TRL) and Renesas Electronics Corporation (ISL12026AIVZ, ISL1208IU8Z-T7A) provide I2C-based RTC functionality with 512B memory or equivalent SRAM/EEPROM configurations. These parts support the required time/date formats and operating temperature range but may differ in package form factor, voltage supply ranges, and current consumption characteristics.
Category 3: Module-Level Alternative (Abracon LLC) AB-RTCMC-32.768KHZ-IBO5-S3-T is a complete RTC module integrating clock/calendar functionality with reduced timekeeping current (0.29µA ~ 0.33µA @ 1.8V ~ 3V). This part is classified as Not For New Designs but remains available for legacy system support.
Parameter Comparison
| Parameter | PCF2127AT/1,512 | PCF2127AT/2Y | DS1388Z-33+T&R | DS1388Z-5+ | DS3231M+TRL | DS3231MZ+TRL | ISL1208IU8Z-T7A | ISL12026AIVZ |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | NXP USA Inc. | NXP USA Inc. | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Renesas Electronics Corporation | Renesas Electronics Corporation |
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar |
| Memory Size | 512B | 512B | 512B | 512B | - | - | 2B | - |
| 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 |
| Voltage - Supply | 1.8V ~ 4.2V | 1.8V ~ 4.2V | 2.97V ~ 3.63V | 4.5V ~ 5.5V | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Battery | 1.8V ~ 4.2V | 1.8V ~ 4.2V | 1.3V ~ 5.5V | 1.3V ~ 5.5V | 2.3V ~ 5.5V | 2.3V ~ 5.5V | 1.8V ~ 5.5V | 1.8V ~ 5.5V |
| Current - Timekeeping (Max) | 1.5µA @ 3.3V | 1.5µA @ 3.3V | 150µA @ 2.97V ~ 3.63V | 270µA @ 4.5V ~ 5.5V | 130µA ~ 200µA @ 3.63V ~ 5.5V | 130µA ~ 200µA @ 3.63V ~ 5.5V | 4µA ~ 6µA @ 3V ~ 5V | 10µA ~ 20µA @ 2.7V ~ 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 |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.295", 7.50mm Width) | 8-SOIC (0.154", 3.90mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP (0.173", 4.40mm Width) |
| Time Format | 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 (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (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 |
| Features | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer | Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | EEPROM, Leap Year, Supervisor, Trickle-Charger, Watchdog Timer | Alarm, Leap Year, Square Wave Output | Alarm, Leap Year, Square Wave Output | Alarm, Leap Year, SRAM | Alarm, Leap Year |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL | 3 (168 Hours) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) | 2 (1 Year) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Recommendation: PCF2127AT/2Y
PCF2127AT/2Y is the direct active production equivalent of the obsolete PCF2127AT/1,512. This part maintains identical electrical specifications, memory capacity (512B), interface protocol (I2C, 2-Wire Serial), voltage supply range (1.8V ~ 4.2V), and operating temperature range (-40°C ~ 85°C). The part is ROHS3 Compliant and carries Active product status, ensuring long-term supply chain availability. Pin-to-pin compatibility and functional equivalence are guaranteed. Packaging differs only in format (Cut Tape & Digi-Reel® versus original packaging), with no impact on electrical performance.
Secondary Recommendations for Voltage-Compatible Designs:
DS3231M+TRL and DS3231MZ+TRL (Analog Devices Inc./Maxim Integrated) support extended voltage supply ranges (2.3V ~ 5.5V) and maintain I2C interface compatibility with 12/24-hour time format and YY-MM-DD-dd date format. These parts are Active status and ROHS3 Compliant. DS3231M+TRL uses 16-SOIC packaging, while DS3231MZ+TRL uses 8-SOIC packaging. Both parts feature Alarm, Leap Year, and Square Wave Output functionality. Current consumption is higher (130µA ~ 200µA) compared to the PCF2127AT/1,512 (1.5µA @ 3.3V), requiring design evaluation for battery-powered applications.
ISL1208IU8Z-T7A (Renesas Electronics Corporation) provides I2C interface with 2B SRAM, Alarm, and Leap Year features. Operating voltage range (2.7V ~ 5.5V) overlaps with the PCF2127AT/1,512 at 2.7V minimum. Current consumption (4µA ~ 6µA @ 3V ~ 5V) is significantly lower than DS1388 variants but higher than the PCF2127AT/1,512. Package is 8-TSSOP/8-MSOP, requiring PCB layout modification. Product status is Active with ROHS3 Compliance.
Alternative for Legacy System Support:
AB-RTCMC-32.768KHZ-IBO5-S3-T (Abracon LLC) is a module-level RTC solution with ultra-low timekeeping current (0.29µA ~ 0.33µA @ 1.8V ~ 3V). This part is classified as Not For New Designs but remains available for legacy applications requiring minimal power consumption. Voltage supply range (1.5V ~ 3.6V) is narrower than the PCF2127AT/1,512. MSL rating is 1 (Unlimited), indicating superior moisture resistance.
Voltage Supply Compatibility Notes:
DS1388Z-5+ operates at 4.5V ~ 5.5V supply voltage, which does not overlap with the PCF2127AT/1,512 (1.8V ~ 4.2V). This part is suitable only for 5V-based designs and requires circuit redesign for direct substitution.
DS1307ZN+T&R operates at 4.5V ~ 5.5V supply voltage with 56B memory, which is incompatible with the PCF2127AT/1,512 voltage range and memory requirements.
Frequently Asked Questions (FAQ)
Q: Can PCF2127AT/2Y be used as a direct replacement for PCF2127AT/1,512?
A: Yes. PCF2127AT/2Y is the active production variant of the PCF2127 series with identical electrical specifications, memory capacity (512B), interface protocol (I2C, 2-Wire Serial), voltage supply range (1.8V ~ 4.2V), and operating temperature range (-40°C ~ 85°C). Pin-to-pin compatibility and functional equivalence are guaranteed. The only difference is packaging format (Cut Tape & Digi-Reel® versus original packaging).
Q: What is the primary difference between PCF2127AT/1,512 and DS3231M+TRL?
A: The primary differences are voltage supply range, package form factor, and current consumption. DS3231M+TRL supports extended voltage range (2.3V ~ 5.5V) versus PCF2127AT/1,512 (1.8V ~ 4.2V). DS3231M+TRL uses 16-SOIC packaging versus 20-SOIC for the PCF2127AT/1,512, requiring PCB layout modification. Current consumption is higher (130µA ~ 200µA @ 3.63V ~ 5.5V) versus 1.5µA @ 3.3V for the PCF2127AT/1,512. Both parts support I2C interface, 12/24-hour time format, and YY-MM-DD-dd date format.
Q: Is ISL1208IU8Z-T7A suitable for battery-powered applications?
A: ISL1208IU8Z-T7A has lower current consumption (4µA ~ 6µA @ 3V ~ 5V) compared to DS1388 variants (150µA ~ 270µA) but higher than PCF2127AT/1,512 (1.5µA @ 3.3V). For ultra-low-power battery applications, PCF2127AT/2Y or AB-RTCMC-32.768KHZ-IBO5-S3-T are preferred. ISL1208IU8Z-T7A is suitable for moderate battery-powered designs where power consumption is not critical.
Q: What packaging considerations apply when substituting the PCF2127AT/1,512?
A: PCF2127AT/1,512 uses 20-SOIC (0.295", 7.50mm Width) packaging. PCF2127AT/2Y maintains identical packaging. DS3231M+TRL uses 16-SOIC, DS3231MZ+TRL uses 8-SOIC, and ISL1208IU8Z-T7A uses 8-TSSOP/8-MSOP. Package changes require PCB layout modification, including footprint redesign, trace routing, and decoupling capacitor placement. Pin count and pinout differ across packages, necessitating schematic and layout review.
Q: Are all substitute parts ROHS3 Compliant?
A: Yes. All substitute parts listed (PCF2127AT/2Y, DS1388Z-33+T&R, DS1388Z-5+, DS3231M+TRL, DS3231MZ+TRL, ISL1208IU8Z-T7A, ISL12026AIVZ, and AB-RTCMC-32.768KHZ-IBO5-S3-T) are ROHS3 Compliant. The PCF2127AT/1,512 is also ROHS3 Compliant.
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 classified as Not For New Designs. For active production designs, PCF2127AT/2Y maintains the original specification of 1.5µA @ 3.3V.
Q: Can DS1307ZN+T&R or DS1341U+T&R substitute for PCF2127AT/1,512?
A: DS1307ZN+T&R operates at 4.5V ~ 5.5V supply voltage with 56B memory, which is incompatible with the PCF2127AT/1,512 voltage range (1.8V ~ 4.2V) and memory requirement (512B). DS1341U+T&R supports voltage range 1.8V ~ 5.5V, which overlaps with the PCF2127AT/1,512, but memory size is not specified. Both parts support I2C interface and 12/24-hour time format. Substitution requires detailed design review for memory capacity and voltage supply compatibility.
Q: What is the MSL (Moisture Sensitivity Level) impact when substituting parts?
A: PCF2127AT/1,512 has MSL 3 (168 Hours). PCF2127AT/2Y maintains MSL 3. DS3231M+TRL also has MSL 3. Other substitutes (DS1388Z-33+T&R, DS1388Z-5+, DS3231MZ+TRL, ISL1208IU8Z-T7A, ISL12026AIVZ, AB-RTCMC-32.768KHZ-IBO5-S3-T) have MSL 1 or 2, indicating lower moisture sensitivity and longer shelf life. MSL 1 parts (Unlimited) are preferred for long-term storage and high-humidity environments.
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