BQ4285S-SB2G4 Equivalent & Substitute Parts

Part Overview

The BQ4285S-SB2G4 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Texas Instruments. This device provides 114 bytes of non-volatile static RAM (NVSRAM) with parallel interface connectivity, supporting both 12-hour and 24-hour time formats along with full date tracking including leap year compensation. The component is classified as obsolete, making identification of active equivalent parts essential for ongoing system support and new design implementations.

Substiute Parts

BQ4285S-SB2G4

Texas InstrumentsIn Stock: 780BQ4285S-SB2G4 Datasheet

Current PartRFQ

DS12885S+

Analog Devices Inc./Maxim IntegratedIn Stock: 2367DS12885S+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BQ4285S-SB2G4 is determined by strict alignment of the following critical parameters:

Electrical Compatibility:

• Supply voltage range: 4.5V ~ 5.5V (primary operation)
• Battery backup voltage range: 2.5V ~ 4V
• Operating temperature range: 0°C ~ 70°C

Functional Compatibility:

• Memory capacity: 114 bytes NVSRAM
• Interface type: Parallel
• Time format support: HH:MM:SS with 12/24-hour selection
• Date format support: YY-MM-DD-dd
• Feature set: Alarm, Daylight Savings, Leap Year, Square Wave Output

Physical Compatibility:

• Package type: 24-SOIC (0.295", 7.50mm Width)
• Mounting type: Surface Mount

The DS12885S+ from Analog Devices Inc./Maxim Integrated meets all specified parameters and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The DS12885S+ is the qualified substitute for the BQ4285S-SB2G4 based on complete parameter alignment across electrical, functional, and physical specifications. The substitute part maintains active product status with Analog Devices Inc./Maxim Integrated, ensuring ongoing availability and manufacturing support. Both components carry identical RoHS3 compliance, REACH unaffected status, and export classification (EAR99), meeting regulatory requirements for equivalent component selection. The DS12885S+ is supplied in tube packaging with 2300 units available in stock, compared to the obsolete BQ4285S-SB2G4 status.

Frequently Asked Questions (FAQ)

Q: Can the DS12885S+ be used as a direct replacement for the BQ4285S-SB2G4 in existing designs?

A: Yes. The DS12885S+ matches all critical electrical parameters (supply voltage, battery backup voltage, operating temperature), functional specifications (memory capacity, interface type, time/date formats, feature set), and physical requirements (24-SOIC package, surface mount). No circuit modifications are required.

Q: Are there any differences in pin configuration between these parts?

A: Both components use the 24-SOIC package with identical 0.295" (7.50mm) width. Pin compatibility is maintained for direct substitution.

Q: What is the significance of the product status difference?

A: The BQ4285S-SB2G4 is classified as obsolete, indicating Texas Instruments has discontinued manufacturing. The DS12885S+ maintains active status with Analog Devices Inc./Maxim Integrated, ensuring continued availability, technical support, and manufacturing consistency.

Q: Do both parts support the same time and date formats?

A: Yes. Both the BQ4285S-SB2G4 and DS12885S+ support HH:MM:SS time format with 12/24-hour selection and YY-MM-DD-dd date format with leap year compensation.

Q: Are the regulatory certifications equivalent?

A: Yes. Both components are ROHS3 compliant, REACH unaffected, and classified under EAR99 export control with identical HTSUS code 8542.39.0001.

Q: What is the memory capacity of these RTC ICs?

A: Both parts provide 114 bytes of non-volatile static RAM (NVSRAM) for data storage and retention during power loss conditions.