DS12C887A Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS12C887A is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 24-DIP through-hole component provides 113 bytes of parallel interface memory with alarm, daylight savings, leap year, and non-volatile SRAM capabilities. The DS12C887A is classified as obsolete, making equivalent and substitute parts necessary for new designs and legacy system replacements. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Substiute Parts

DS12C887A

Analog Devices Inc./Maxim IntegratedIn Stock: 6771DS12C887A Datasheet

Current PartRFQ

DS12C887A+

Analog Devices Inc./Maxim IntegratedIn Stock: 1090DS12C887A+ Datasheet

DirectRFQ

BQ4802LYDWR

Texas InstrumentsIn Stock: 3828BQ4802LYDWR Datasheet

MFR RecommendedRFQ

BQ4802LYPWR

Texas InstrumentsIn Stock: 28912BQ4802LYPWR Datasheet

MFR RecommendedRFQ

M48T08-100PC1

STMicroelectronicsIn Stock: 1683M48T08-100PC1 Datasheet

MFR RecommendedRFQ

M48T18-100PC1

STMicroelectronicsIn Stock: 1462M48T18-100PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS12C887A is determined by the following critical parameters:

Primary Compatibility Criteria:

• Parallel interface architecture
• Time format support (12/24 hour capability)
• Date format support (YY-MM-DD-dd)
• Operating temperature range (0°C ~ 70°C minimum)
• Clock/Calendar functionality with alarm capability

Secondary Compatibility Considerations:

• Package type (through-hole DIP preferred for direct replacement; surface-mount alternatives require PCB redesign)
• Supply voltage compatibility (4.5V ~ 5.5V primary; 2.7V ~ 3.6V acceptable for lower-power applications)
• Memory architecture (NVSRAM or equivalent non-volatile storage)
• RoHS compliance status (active parts preferred for new designs)

Substitutes are grouped into two categories: direct equivalents maintaining identical package and pinout (DS12C887A+), and functional alternatives with different packages requiring design modification (BQ4802LYDWR, BQ4802LYPWR, M48T08-100PC1, M48T18-100PC1).

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (No PCB Modification Required):

DS12C887A+ is the primary substitute for the DS12C887A. Both components maintain identical 24-DIP through-hole packaging, pinout, and electrical specifications. The DS12C887A+ is active and ROHS3 compliant, addressing the obsolescence status of the original part while preserving full compatibility with existing PCB designs and firmware implementations.

Functional Alternatives (PCB Redesign Required):

BQ4802LYDWR and BQ4802LYPWR (Texas Instruments) provide equivalent clock/calendar functionality with reduced power consumption (1.5mA typical vs. 15mA maximum). These parts require surface-mount PCB redesign and operate at lower supply voltages (2.7V ~ 3.6V). Both are ROHS3 compliant and active products.

M48T08-100PC1 and M48T18-100PC1 (STMicroelectronics, Timekeeper® series) maintain through-hole DIP packaging but use 28-pin configuration versus the 24-pin DS12C887A. These parts are ROHS3 compliant and active. M48T18-100PC1 supports the full 4.5V ~ 5.5V supply range matching the DS12C887A; M48T08-100PC1 requires 4.75V ~ 5.5V minimum.

Compliance Consideration:

All substitute parts are ROHS3 compliant, whereas the DS12C887A is RoHS non-compliant. For new designs and systems requiring regulatory compliance, substitutes are mandatory.

Frequently Asked Questions (FAQ)

Q: Can DS12C887A+ be used as a direct drop-in replacement?

A: Yes. DS12C887A+ maintains identical 24-DIP packaging, pinout, supply voltage range (4.5V ~ 5.5V), and functional specifications including alarm, daylight savings, leap year, and NVSRAM features. No PCB modification is required.

Q: What is the primary difference between DS12C887A and DS12C887A+?

A: Product status and RoHS compliance. DS12C887A is obsolete and RoHS non-compliant; DS12C887A+ is active and ROHS3 compliant. Electrical and mechanical specifications are identical.

Q: Can BQ4802LYDWR or BQ4802LYPWR replace DS12C887A without PCB changes?

A: No. Both Texas Instruments parts use surface-mount packaging (28-SOIC and 28-TSSOP respectively) versus the through-hole 24-DIP of the DS12C887A. PCB redesign is required. Additionally, they operate at 2.7V ~ 3.6V supply voltage, requiring power supply modification for systems designed around 4.5V ~ 5.5V.

Q: Are M48T08-100PC1 and M48T18-100PC1 pin-compatible with DS12C887A?

A: No. Both STMicroelectronics parts use 28-DIP packaging versus the 24-DIP of DS12C887A. Pinout differs, requiring PCB redesign and firmware verification. However, both maintain through-hole mounting and parallel interface architecture.

Q: Which substitute offers the lowest power consumption?

A: BQ4802LYDWR and BQ4802LYPWR (Texas Instruments) consume 1.5mA typical during timekeeping, compared to 15mA maximum for DS12C887A. This represents a 90% reduction in power consumption but requires PCB redesign and lower supply voltage operation (2.7V ~ 3.6V).

Q: Do all substitutes support 12/24 hour time format?

A: DS12C887A+, BQ4802LYDWR, and BQ4802LYPWR support both 12/24 hour formats. M48T08-100PC1 and M48T18-100PC1 support 24-hour format only. Firmware modification may be required if 12-hour format is essential.

Q: Are all substitutes ROHS3 compliant?

A: Yes. DS12C887A+ (Analog Devices), BQ4802LYDWR and BQ4802LYPWR (Texas Instruments), and M48T08-100PC1 and M48T18-100PC1 (STMicroelectronics) are all ROHS3 compliant. The original DS12C887A is RoHS non-compliant.

Q: What is the inventory status of these substitutes?

A: DS12C887A+ (1021 pcs), BQ4802LYDWR (3770 pcs), BQ4802LYPWR (28900 pcs), M48T08-100PC1 (1628 pcs), and M48T18-100PC1 (1444 pcs) are all in stock as new original components.