BQ4802YPWR Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The BQ4802YPWR is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality manufactured by Texas Instruments in a 28-TSSOP surface mount package. This device provides parallel interface timekeeping with alarm, daylight savings, leap year, supervisor, and watchdog timer features. The main part is classified as obsolete product status, making equivalent and substitute parts necessary for ongoing system support, redesigns, and production continuity. Substitute parts are selected based on functional equivalence in timekeeping capability, interface type, electrical specifications, and package compatibility.

Key Parameters

Parameter	BQ4802YPWR
Manufacturer	Texas Instruments
Product Type	Real Time Clock (RTC) IC Clock/Calendar
Interface	Parallel
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Package / Case	28-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage - Supply	4.5V ~ 5.5V
Voltage - Supply, Battery	2.4V ~ 4V
Current - Timekeeping (Max)	1.5mA (Typ) @ 4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Features	Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the BQ4802YPWR are grouped based on the following substitution criteria:

Primary Substitution Criteria:

Parallel interface architecture
Time format support: HH:MM:SS (12/24 hr)
Date format support: YY-MM-DD-dd
Supply voltage compatibility: 4.5V ~ 5.5V main supply
Battery backup voltage range: 2.4V ~ 4V or compatible
Surface mount or through-hole mounting options
RTC with integrated clock/calendar functionality
Alarm and watchdog timer features

Grouping Logic:

Direct Package Match (28-TSSOP): BQ4802YPW provides identical package and pinout compatibility with active product status
Package Variant Substitutes (24-SOIC, 24-DIP, 28-SOIC, 28-DIP, 32-DIP, 34-PowerCap): DS12885SN+, DS12887A+, DS12C887A+, DS1501YZN+, DS1511W+, DS1554-70IND+, DS1556WP-120IND+, DS1557WP-120IND+, DS1685QN-3+ offer functional equivalence with different package footprints and enhanced memory or feature sets

All substitute parts maintain parallel interface operation, support 12/24-hour time format, and include calendar functionality with alarm capabilities.

Parameter Comparison

Parameter	BQ4802YPWR	BQ4802YPW	DS12885SN+	DS12887A+	DS12C887A+	DS1501YZN+	DS1511W+	DS1554-70IND+	DS1556WP-120IND+	DS1557WP-120IND+	DS1685QN-3+
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Type	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar	RTC Clock/Calendar
Interface	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel
Time Format	HH:MM:SS (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)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (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
Package / Case	28-TSSOP	28-TSSOP	24-SOIC	24-DIP Module	24-DIP Module	28-SOIC	28-DIP Module	32-DIP Module	34-PowerCap™ Module	34-PowerCap™ Module	28-LCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Through Hole	Through Hole	Surface Mount	Through Hole	Through Hole	Surface Mount	Surface Mount	Surface Mount
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	3V ~ 3.6V	4.5V ~ 5.5V	2.97V ~ 3.63V	2.97V ~ 3.63V	2.7V ~ 3.7V
Voltage - Supply, Battery	2.4V ~ 4V	2.4V ~ 4V	2.5V ~ 4V	2.5V ~ 4V	2.5V ~ 4V	2.5V ~ 3.7V	2.5V ~ 3.7V	N/A	3V	3V	2.5V ~ 3.7V
Current - Timekeeping (Max)	1.5mA @ 4.5V ~ 5.5V	1.5mA @ 4.5V ~ 5.5V	15mA @ 4.5V ~ 5.5V	15mA @ 4.5V ~ 5.5V	15mA @ 4.5V ~ 5.5V	5mA @ 4.5V ~ 5.5V	4mA @ 3V ~ 3.6V	6mA @ 5V	4mA @ 3.3V	4mA @ 3.3V	2mA @ 3V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Memory Size	N/A	N/A	114B	114B	113B	256B	256B	32KB	128KB	512KB	242B
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Recommended for Pin-Compatible Designs): BQ4802YPW is the primary substitute for BQ4802YPWR. Both parts share identical 28-TSSOP packaging, pinout, electrical specifications, and functional features. BQ4802YPW maintains active product status, ensuring long-term availability and supply chain continuity. This part requires no circuit redesign and provides drop-in compatibility.

Surface Mount Alternatives (28-SOIC Package): DS1501YZN+ offers surface mount operation in 28-SOIC package with expanded memory (256B), enhanced operating temperature range (-40°C to 85°C), and reduced timekeeping current (5mA). This part is suitable for designs where package footprint change is acceptable and extended temperature operation is required.

Through-Hole Alternatives (24-DIP and 28-DIP Packages): DS12887A+ and DS12C887A+ provide through-hole mounting in 24-DIP modules with expanded memory (114B/113B) and square wave output features. DS1511W+ offers 28-DIP through-hole mounting with 256B memory and 24-hour time format. These parts are appropriate for legacy board designs or applications requiring through-hole soldering.

High-Capacity Memory Alternatives (32-DIP and 34-PowerCap Packages): DS1554-70IND+ (32KB memory, 32-DIP) and DS1556WP-120IND+ (128KB memory, 34-PowerCap) provide significantly expanded non-volatile SRAM capacity for applications requiring extended data logging or parameter storage. DS1557WP-120IND+ extends memory to 512KB in the same 34-PowerCap package. These parts operate at reduced supply voltages (2.97V to 3.63V) and are suitable for low-power applications.

Low-Power Surface Mount Alternative (28-LCC Package): DS1685QN-3+ operates at reduced supply voltage (2.7V to 3.7V) with minimal timekeeping current (2mA @ 3V) and extended operating temperature range (-40°C to 85°C). This part is optimized for battery-powered applications and low-power embedded systems.

All substitute parts maintain ROHS3 compliance and active product status, ensuring regulatory compliance and supply availability.

Frequently Asked Questions (FAQ)

Q: Can BQ4802YPW directly replace BQ4802YPWR without circuit modification? A: Yes. BQ4802YPW is a direct pin-compatible replacement with identical 28-TSSOP packaging, pinout, and electrical specifications. No circuit redesign is required. The primary difference is product status: BQ4802YPWR is obsolete while BQ4802YPW is active.

Q: What are the key differences between BQ4802YPWR and DS12885SN+? A: DS12885SN+ uses 24-SOIC surface mount packaging instead of 28-TSSOP, reducing pin count from 28 to 24. DS12885SN+ includes 114B non-volatile SRAM memory and square wave output features not present in BQ4802YPWR. Timekeeping current is higher (15mA vs 1.5mA). Operating temperature range is extended (-40°C to 85°C vs 0°C to 70°C). Circuit redesign is required for package migration.

Q: Are through-hole alternatives available? A: Yes. DS12887A+, DS12C887A+, and DS1511W+ provide through-hole mounting in 24-DIP and 28-DIP modules. These parts are suitable for legacy board designs or applications requiring through-hole soldering techniques. All maintain parallel interface operation and calendar functionality.

Q: Which substitute part offers the lowest power consumption? A: DS1685QN-3+ provides the lowest timekeeping current at 2mA @ 3V. This part is optimized for battery-powered applications and operates at reduced supply voltage (2.7V to 3.7V). Operating temperature range extends to -40°C to 85°C.

Q: What memory options are available in substitute parts? A: BQ4802YPWR and BQ4802YPW do not include non-volatile SRAM. Substitute parts offer memory ranging from 113B to 512KB: DS12885SN+ and DS12887A+ (114B/113B), DS1501YZN+ and DS1511W+ (256B), DS1554-70IND+ (32KB), DS1556WP-120IND+ (128KB), DS1557WP-120IND+ (512KB), and DS1685QN-3+ (242B).

Q: Can substitute parts with different supply voltage ranges be used in 5V systems? A: DS1556WP-120IND+, DS1557WP-120IND+, and DS1685QN-3+ operate at reduced supply voltages (2.97V to 3.63V or 2.7V to 3.7V). These parts require voltage regulation or level shifting for integration into 5V systems. DS12885SN+, DS12887A+, DS12C887A+, DS1501YZN+, DS1511W+, and DS1554-70IND+ maintain 4.5V to 5.5V supply compatibility with BQ4802YPWR.

Q: What is the significance of the 12/24-hour time format difference? A: BQ4802YPWR, BQ4802YPW, DS12885SN+, DS12887A+, DS12C887A+, and DS1685QN-3+ support both 12-hour and 24-hour time formats. DS1501YZN+, DS1511W+, DS1554-70IND+, DS1556WP-120IND+, and DS1557WP-120IND+ operate in 24-hour format only. Firmware or application code must accommodate this difference during substitution.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, meeting environmental and regulatory requirements equivalent to BQ4802YPWR.

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