PCF8583T/5,518 Equivalent & Substitute Parts

Part Overview

The PCF8583T/5,518 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by NXP Semiconductors. This device 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/5,518 is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and system updates.

Key Parameters

Parameter	PCF8583T/5,518
Manufacturer	NXP Semiconductors
Package / Case	8-SOIC (0.295", 7.50mm Width)
Interface	I2C, 2-Wire Serial
Voltage - Supply	2.5V ~ 6V
Operating Temperature	-40°C ~ 85°C
Memory Size	240B
Time Format	HH:MM:SS:hh (12/24 hr)
Date Format	YY-MM-DD
Features	Alarm, NVSRAM, Square Wave Output
Current - Timekeeping (Max)	10µA ~ 50µA @ 1V ~ 5V
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Parameters:

Interface: I2C, 2-Wire Serial (mandatory match)
Operating Temperature: -40°C ~ 85°C (mandatory match)
Mounting Type: Surface Mount (mandatory match)
RoHS Status: ROHS3 Compliant (mandatory match)

Secondary Compatibility Parameters:

Package / Case: 8-SOIC or equivalent compact surface-mount packages
Voltage - Supply: Overlapping or extended range acceptable
Time Format: 12/24 hour capability (mandatory match)
Date Format: YY-MM-DD or extended format acceptable
Features: Alarm and Square Wave Output (core features)

Substitute parts are grouped into two categories:

Category A - Direct Package Equivalents (8-SOIC):

1339-31DCGI8 (Renesas)
BQ32000D (Texas Instruments)
BQ32000DR (Texas Instruments)

Category B - Compact Surface-Mount Alternatives (8-TSSOP/8-MSOP):

1337AGDVGI (Renesas)
1337DVGI8 (Renesas)
1337GDVGI (Renesas)
BU9873NUX-TTR (Rohm Semiconductor)
DS1308U-18+T (Analog Devices Inc./Maxim Integrated)
DS1308U-33+ (Analog Devices Inc./Maxim Integrated)

Category C - Through-Hole and Alternative Packages:

DS1307N+ (Analog Devices Inc./Maxim Integrated)

Parameter Comparison

Part Number	Manufacturer	Package / Case	Interface	Voltage - Supply	Operating Temperature	Time Format	Date Format	Features	Product Status	RoHS Status
PCF8583T/5,518	NXP Semiconductors	8-SOIC (0.295", 7.50mm)	I2C, 2-Wire Serial	2.5V ~ 6V	-40°C ~ 85°C	HH:MM:SS:hh (12/24 hr)	YY-MM-DD	Alarm, NVSRAM, Square Wave Output	Obsolete	ROHS3 Compliant
1337AGDVGI	Renesas Electronics	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	1.8V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	Active	ROHS3 Compliant
1337DVGI8	Renesas Electronics	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	1.8V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	Active	ROHS3 Compliant
1337GDVGI	Renesas Electronics	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	1.8V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output	Active	ROHS3 Compliant
1339-31DCGI8	Renesas Electronics	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	3.3V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3 Compliant
BQ32000D	Texas Instruments	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	3V ~ 3.6V	-40°C ~ 85°C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3 Compliant
BQ32000DR	Texas Instruments	8-SOIC (0.154", 3.90mm)	I2C, 2-Wire Serial	3V ~ 3.6V	-40°C ~ 85°C	HH:MM:SS (24 hr)	YY-MM-DD-dd	Leap Year, Square Wave Output, Trickle-Charger	Active	ROHS3 Compliant
BU9873NUX-TTR	Rohm Semiconductor	8-UFDFN Exposed Pad	I2C, 2-Wire Serial	1.8V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Alarm, Leap Year	Not For New Designs	ROHS3 Compliant
DS1307N+	Analog Devices Inc./Maxim Integrated	8-DIP (0.300", 7.62mm)	I2C, 2-Wire Serial	4.5V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant
DS1308U-18+T	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	1.71V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant
DS1308U-33+	Analog Devices Inc./Maxim Integrated	8-TSSOP, 8-MSOP (0.118", 3.00mm)	I2C, 2-Wire Serial	3V ~ 5.5V	-40°C ~ 85°C	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Leap Year, NVSRAM, Square Wave Output	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct 8-SOIC Package Replacement:

The 1339-31DCGI8 (Renesas Electronics) provides the closest functional match in an 8-SOIC package. This part is Active status and ROHS3 compliant. The voltage supply range is 3.3V ~ 5.5V, which overlaps with the PCF8583T/5,518 upper operating range. The 1339-31DCGI8 includes trickle-charger functionality and maintains I2C interface compatibility with identical operating temperature specifications.

The BQ32000D and BQ32000DR (Texas Instruments) are also 8-SOIC alternatives with Active status and ROHS3 compliance. These parts operate at 3V ~ 3.6V and include trickle-charger capability. The narrower voltage range requires design verification if the original application requires operation below 3V.

For Compact Surface-Mount Alternatives (8-TSSOP/8-MSOP):

The Renesas 1337 series (1337AGDVGI, 1337DVGI8, 1337GDVGI) offers Active status parts with extended voltage range (1.8V ~ 5.5V) and reduced package footprint. All three variants maintain I2C interface compatibility and include alarm and square wave output features. These parts are suitable for space-constrained applications.

The DS1308U-18+T and DS1308U-33+ (Analog Devices Inc./Maxim Integrated) provide Active status alternatives with NVSRAM capability matching the original part. The DS1308U-18+T supports extended voltage range (1.71V ~ 5.5V), while DS1308U-33+ operates at 3V ~ 5.5V. Both maintain full I2C compatibility and include leap year support.

For Through-Hole Applications:

The DS1307N+ (Analog Devices Inc./Maxim Integrated) is an Active status alternative in 8-DIP package for through-hole mounting. This part includes NVSRAM and operates at 4.5V ~ 5.5V with full I2C compatibility.

Status Considerations:

Avoid BU9873NUX-TTR (Rohm Semiconductor) for new designs. This part is classified as "Not For New Designs" despite Active inventory status.

All recommended substitutes are ROHS3 compliant and maintain the -40°C ~ 85°C operating temperature range of the original part.

Frequently Asked Questions (FAQ)

Q: Can the 1339-31DCGI8 directly replace the PCF8583T/5,518 in existing designs?

A: The 1339-31DCGI8 is functionally compatible for I2C-based RTC applications. Both parts use I2C/2-Wire Serial interface, operate across -40°C ~ 85°C, and include alarm and square wave output features. The 1339-31DCGI8 operates at 3.3V ~ 5.5V, which covers the upper portion of the PCF8583T/5,518 range (2.5V ~ 6V). Design verification is required if operation below 3.3V is necessary.

Q: What is the difference between the three Renesas 1337 variants?

A: The 1337AGDVGI, 1337DVGI8, and 1337GDVGI are functionally equivalent I2C RTC parts in 8-TSSOP/8-MSOP packages. All three operate at 1.8V ~ 5.5V and include alarm and leap year features. Differences exist in timekeeping current specifications: 1337AGDVGI draws 0.3µA @ 1.3V ~ 1.8V, while 1337DVGI8 and 1337GDVGI draw 0.6µA @ 1.3V ~ 1.8V. Selection depends on power consumption requirements.

Q: Are the BQ32000D and BQ32000DR interchangeable?

A: Yes. Both parts are functionally identical 8-SOIC RTC devices from Texas Instruments. The primary difference is packaging: BQ32000D is supplied in Tube, while BQ32000DR is supplied in Cut Tape (CT) & Digi-Reel. Both operate at 3V ~ 3.6V with identical electrical specifications.

Q: Why does the DS1308U-18+T have a lower minimum voltage than DS1308U-33+?

A: The DS1308U-18+T is rated for 1.71V ~ 5.5V supply voltage, while DS1308U-33+ is rated for 3V ~ 5.5V. The DS1308U-18+T supports extended low-voltage operation, making it suitable for battery-backed applications requiring operation at lower supply levels. Both parts maintain identical I2C interface and feature sets.

Q: Can I use the DS1307N+ as a substitute if my application uses through-hole mounting?

A: Yes. The DS1307N+ is an Active status RTC in 8-DIP through-hole package with I2C interface compatibility. It includes NVSRAM, alarm, and square wave output features. The operating voltage range is 4.5V ~ 5.5V, which requires design verification if the original application operates below 4.5V.

Q: What is the significance of the trickle-charger feature in the 1339-31DCGI8 and BQ32000 series?

A: The trickle-charger feature enables charging of a backup battery or supercapacitor from the main supply voltage. This maintains RTC operation during power loss. The PCF8583T/5,518 does not specify trickle-charger capability, so this feature is supplementary in substitute parts.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the PCF8583T/5,518.

Q: Which substitute offers the best low-power performance?

A: The 1337AGDVGI (Renesas) offers the lowest timekeeping current at 0.3µA @ 1.3V ~ 1.8V, making it optimal for battery-backed applications requiring extended runtime.

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