PCF8583T/5,512 Equivalent & Substitute Parts

Part Overview

The PCF8583T/5,512 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by NXP USA Inc. This component integrates a 240-byte NVSRAM, alarm capability, and square wave output in an 8-SOIC package. The part operates across a 2.5V to 6V supply range with I2C/2-Wire Serial interface compatibility.

The PCF8583T/5,512 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and leverage active product lines with comparable or enhanced electrical and mechanical specifications.

Key Parameters

Parameter	PCF8583T/5,512
Manufacturer	NXP USA Inc.
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Memory Size	240B
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD
Voltage Supply Range	2.5V ~ 6V
Current - Timekeeping (Max)	10µA ~ 50µA @ 1V ~ 5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Features	Alarm, NVSRAM, Square Wave Output
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Interface Compatibility: I2C/2-Wire Serial protocol required
Functional Features: Alarm and Square Wave Output capability
Operating Temperature Range: -40°C ~ 85°C minimum
Supply Voltage Overlap: Minimum 2.5V support or design accommodation
Package Compatibility: Surface mount packages (8-SOIC, 8-TSSOP, 8-MSOP, or module form factors)
Product Status: Active or available alternatives to obsolete classification
Compliance: ROHS3 and REACH compliance maintained

Substitute parts are grouped by package type and electrical performance tier. Parts with lower timekeeping current consumption and wider voltage ranges provide enhanced performance characteristics while maintaining functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Interface	Voltage Supply	Current - Timekeeping (Max)	Operating Temp	Package / Case	Features	Product Status
PCF8583T/5,512	NXP USA Inc.	I2C, 2-Wire Serial	2.5V ~ 6V	10µA ~ 50µA @ 1V ~ 5V	-40°C ~ 85°C	8-SOIC (0.295", 7.50mm)	Alarm, NVSRAM, Square Wave Output	Obsolete
1337AGDVGI	Renesas Electronics	I2C, 2-Wire Serial	1.8V ~ 5.5V	0.3µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	8-TSSOP, 8-MSOP (0.118", 3.00mm)	Alarm, Leap Year, Square Wave Output	Active
1337AGDVGI8	Renesas Electronics	I2C, 2-Wire Serial	1.8V ~ 5.5V	0.3µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	8-TSSOP, 8-MSOP (0.118", 3.00mm)	Alarm, Leap Year, Square Wave Output	Active
1337GDCGI8	Renesas Electronics	I2C, 2-Wire Serial	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Alarm, Leap Year, Square Wave Output	Active
1337GDVGI	Renesas Electronics	I2C, 2-Wire Serial	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	8-TSSOP, 8-MSOP (0.118", 3.00mm)	Alarm, Leap Year, Square Wave Output	Active
1338-31DCGI	Renesas Electronics	I2C, 2-Wire Serial	3.3V ~ 5.5V	5µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Leap Year, NVSRAM, Square Wave Output	Active
AB-RTCMC-32.768KHZ-B5GA-S3-T	Abracon LLC	I2C, 2-Wire Serial	1.2V ~ 5.5V	0.45µA ~ 0.55µA @ 2V ~ 5V	-40°C ~ 85°C	10-SMD Module	Alarm, Leap Year, Square Wave Output	Active
BU9873NUX-TTR	Rohm Semiconductor	I2C, 2-Wire Serial	1.8V ~ 5.5V	1µA ~ 1.35µA @ 3V ~ 5.5V	-40°C ~ 85°C	8-UFDFN Exposed Pad	Alarm, Leap Year	Not For New Designs
DS1308U-3+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	2.7V ~ 5.5V	Not Specified	-40°C ~ 85°C	8-TSSOP, 8-MSOP (0.118", 3.00mm)	Leap Year, NVSRAM, Square Wave Output	Active
DS1338Z-33+T&R	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	3V ~ 5.5V	125µA ~ 200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Leap Year, NVSRAM, Square Wave Output	Active
DS1340U-18+	Analog Devices Inc./Maxim Integrated	I2C, 2-Wire Serial	1.71V ~ 5.5V	100µA @ 1.89V	-40°C ~ 85°C	8-TSSOP, 8-MSOP (0.118", 3.00mm)	Leap Year, Trickle-Charger	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

The Renesas 1337 series (1337AGDVGI, 1337AGDVGI8, 1337GDCGI8, 1337GDVGI) represents the most direct functional equivalents. These parts maintain I2C/2-Wire Serial interface, alarm functionality, and square wave output. The 1337GDCGI8 offers 8-SOIC packaging matching the original form factor, while the TSSOP variants provide compact alternatives. All are active products with ROHS3 compliance.

Alternative Substitutes (Functional Equivalence with Design Considerations)

The Analog Devices DS1308U-3+ and DS1338Z-33+T&R provide NVSRAM and square wave output with active product status. The DS1338Z-33+T&R matches 8-SOIC packaging but operates at 3V minimum supply voltage. The DS1340U-18+ offers extended low-voltage operation (1.71V minimum) with trickle-charger capability.

The Abracon AB-RTCMC-32.768KHZ-B5GA-S3-T module form factor provides integrated oscillator functionality with superior low-voltage performance (1.2V minimum) and ultra-low timekeeping current.

Not Recommended for New Designs

The Rohm BU9873NUX-TTR is classified as "Not For New Designs" and should be avoided for new applications despite active inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the PCF8583T/5,512 be directly replaced with the Renesas 1337GDCGI8?

A: Yes. Both parts feature I2C/2-Wire Serial interface, alarm capability, square wave output, and 8-SOIC packaging. The 1337GDCGI8 operates at 1.8V ~ 5.5V (narrower than the original 2.5V ~ 6V range) with significantly lower timekeeping current (0.6µA vs. 10µA ~ 50µA). PCB layout compatibility requires verification of pin assignments and package dimensions (3.90mm vs. 7.50mm width).

Q: What is the key difference between the Renesas 1337AGDVGI and 1337GDCGI8?

A: The 1337AGDVGI uses 8-TSSOP/8-MSOP packaging (0.118", 3.00mm width) with 0.3µA timekeeping current. The 1337GDCGI8 uses 8-SOIC packaging (0.154", 3.90mm width) with 0.6µA timekeeping current. Package selection depends on PCB layout constraints and thermal management requirements.

Q: Does the Abracon AB-RTCMC-32.768KHZ-B5GA-S3-T module require additional oscillator components?

A: No. The Abracon module integrates the 32.768 kHz oscillator, eliminating external crystal requirements. This reduces component count and PCB area compared to discrete IC solutions. The 10-SMD module form factor requires different PCB footprint design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original PCF8583T/5,512 environmental certification requirements.

Q: What supply voltage range is common across all substitutes?

A: The overlapping range across all active substitutes is 1.8V ~ 5.5V. The original PCF8583T/5,512 operates at 2.5V ~ 6V. Designs operating below 2.5V or above 5.5V require specific part selection (e.g., Abracon module for 1.2V minimum, or original part for 6V maximum).

Q: Which substitute offers the lowest timekeeping current consumption?

A: The Renesas 1337AGDVGI and 1337AGDVGI8 offer 0.3µA @ 1.3V ~ 1.8V, representing the lowest specified timekeeping current among active substitutes. The Abracon module specifies 0.45µA ~ 0.55µA @ 2V ~ 5V.

Q: Can the DS1338Z-33+T&R replace the PCF8583T/5,512 in existing designs?

A: Functional replacement is possible due to I2C interface, alarm, and square wave output compatibility. However, the DS1338Z-33+T&R requires minimum 3V supply (vs. 2.5V original) and exhibits higher timekeeping current (125µA ~ 200µA vs. 10µA ~ 50µA). Power budget and supply voltage constraints must be re-evaluated.

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