DS1553-70+ Equivalent & Substitute Parts

Part Overview

The DS1553-70+ is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device provides 8KB of parallel-accessible memory with comprehensive timekeeping features including alarm, leap year compensation, non-volatile SRAM (NVSRAM), watchdog timer, and Y2K compliance. The part is packaged in a 28-DIP module (0.600", 15.24mm) with through-hole mounting.

The DS1553-70+ is classified as obsolete. Locating equivalent substitute parts is necessary to support legacy system maintenance, board redesigns, and production continuity where original inventory is depleted or unavailable.

Substiute Parts

DS1553-70+

Analog Devices Inc./Maxim IntegratedIn Stock: 1083DS1553-70+ Datasheet

Current PartRFQ

M48T02-150PC1

STMicroelectronicsIn Stock: 1525M48T02-150PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1553-70+ is determined by the following critical parameters:

• Interface Type: Parallel interface is mandatory for direct substitution
• Time/Date Format: HH:MM:SS (24 hr) and YY-MM-DD-dd format compatibility
• Operating Temperature Range: 0°C ~ 70°C
• Supply Voltage Range: Compatibility within 4.5V ~ 5.5V or overlapping range
• Mounting Type: Through-hole DIP packaging required
• RoHS Compliance: ROHS3 Compliant status for regulatory alignment
• Current Consumption: Timekeeping current specifications at rated voltage

The M48T02-150PC1 from STMicroelectronics qualifies as a substitute based on matching interface type (parallel), time/date format (HH:MM:SS 24 hr, YY-MM-DD-dd), operating temperature range (0°C ~ 70°C), supply voltage compatibility (4.75V ~ 5.5V overlaps with DS1553-70+ range), through-hole mounting, and RoHS3 compliance. Package differences (24-DIP vs. 28-DIP) and memory size variations are noted as design considerations.

Parameter Comparison

Engineering Selection Recommendations

The M48T02-150PC1 is an active product with current manufacturing support, providing supply continuity for legacy DS1553-70+ applications. Both parts maintain ROHS3 compliance and MSL rating 1 status, ensuring regulatory and environmental compatibility.

The M48T02-150PC1 operates within a narrower supply voltage range (4.75V ~ 5.5V) compared to the DS1553-70+ (4.5V ~ 5.5V). Systems operating at voltages below 4.75V require verification of circuit design compatibility.

Package pin count differs between the two devices (28-DIP vs. 24-DIP). PCB layout and socket compatibility must be evaluated during integration. Memory size specifications differ; the DS1553-70+ provides 8KB while the M48T02-150PC1 memory size is not specified in available data. Functional feature sets vary; the DS1553-70+ includes alarm, watchdog timer, and Y2K compliance, while the M48T02-150PC1 specifies leap year functionality.

Frequently Asked Questions (FAQ)

Q: Can the M48T02-150PC1 directly replace the DS1553-70+ without PCB modifications?

A: Direct socket replacement is not possible due to package differences (24-DIP vs. 28-DIP pin count). PCB layout redesign and socket modification are required. Pin-to-pin functional mapping must be verified against both datasheets before implementation.

Q: What is the minimum supply voltage for the M48T02-150PC1?

A: The M48T02-150PC1 operates at 4.75V minimum. The DS1553-70+ operates at 4.5V minimum. Systems designed for 4.5V to 4.75V operation require circuit redesign or alternative substitutes.

Q: Are both parts RoHS compliant?

A: Yes. Both the DS1553-70+ and M48T02-150PC1 are ROHS3 compliant with MSL rating 1 (unlimited moisture sensitivity level).

Q: What are the key functional differences between these parts?

A: The DS1553-70+ includes alarm, watchdog timer, and Y2K compliance features with 8KB memory. The M48T02-150PC1 specifies leap year functionality. Feature set compatibility must be confirmed against application requirements before substitution.

Q: Is the M48T02-150PC1 currently available?

A: The M48T02-150PC1 is classified as active product status with current manufacturing support, unlike the obsolete DS1553-70+. Availability through authorized distributors is expected.