DS1747-70IND Equivalent & Substitute Parts

Part Overview

The DS1747-70IND is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality and 512KB of Non-Volatile Static RAM (NVSRAM). This through-hole mounted 32-DIP module operates across industrial temperature ranges (-40°C to 85°C) and provides parallel interface connectivity for embedded timing and data retention applications. The DS1747-70IND is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

DS1747-70IND

Analog Devices Inc./Maxim IntegratedIn Stock: 1319DS1747-70IND Datasheet

Current PartRFQ

DS1747-70IND+

Analog Devices Inc./Maxim IntegratedIn Stock: 3752DS1747-70IND+ Datasheet

DirectRFQ

BQ4802YDWR

Texas InstrumentsIn Stock: 1873BQ4802YDWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS1747-70IND is determined by the following critical parameters:

Primary Compatibility Criteria:

• Real Time Clock (RTC) with Clock/Calendar functionality
• Parallel interface architecture
• Supply voltage range: 4.5V ~ 5.5V
• Time format: HH:MM:SS (24 hr capability)
• Date format: YY-MM-DD-dd
• Operating temperature range compatibility
• Leap Year and Y2K support

Substitute Classification:

Direct Equivalent (Same Manufacturer, Active Status): DS1747-70IND+ maintains identical electrical specifications, memory capacity (512KB), and functional features as the main part. The primary difference is product status (Active vs. Obsolete) and packaging format (Tube vs. standard module packaging).

Cross-Manufacturer Substitute (Different Package/Interface): BQ4802YDWR from Texas Instruments provides RTC Clock/Calendar functionality with parallel interface and compatible supply voltage range. This substitute operates within the same voltage specification (4.5V ~ 5.5V) and supports equivalent time/date formats. However, package type differs (28-SOIC surface mount vs. 32-DIP through hole), and operating temperature range is narrower (0°C ~ 70°C vs. -40°C ~ 85°C).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): DS1747-70IND+ is the optimal choice for applications requiring identical form factor, electrical characteristics, and functional specifications. This part maintains through-hole mounting compatibility and preserves the 32-DIP package footprint. DS1747-70IND+ carries Active product status and ROHS3 compliance, providing supply chain continuity and regulatory alignment.

For Cross-Manufacturer Substitution: BQ4802YDWR from Texas Instruments is suitable only when design modifications accommodate surface-mount assembly and package transition from 32-DIP to 28-SOIC. This substitute is appropriate for applications where operating temperature does not exceed 70°C and where the narrower temperature range (-40°C to 85°C is not required). BQ4802YDWR offers enhanced features including alarm functionality, daylight savings support, and integrated supervisor/watchdog timer capabilities. Current consumption is lower (1.5mA typical vs. 4mA maximum), providing power efficiency benefits.

Both substitute parts maintain ROHS3 compliance and REACH unaffected status, supporting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can DS1747-70IND+ be used as a direct drop-in replacement for DS1747-70IND?

A: Yes. DS1747-70IND+ maintains identical electrical specifications, memory capacity, functional features, and package dimensions. The primary differences are product status (Active vs. Obsolete) and packaging format (Tube). No circuit modifications are required.

Q: What are the key limitations when substituting BQ4802YDWR for DS1747-70IND?

A: BQ4802YDWR requires PCB redesign due to package change from 32-DIP through-hole to 28-SOIC surface mount. Operating temperature range is restricted to 0°C ~ 70°C, making this substitute unsuitable for applications requiring -40°C operation. Memory size specifications differ. Pin configuration and signal timing may require design validation.

Q: Are all substitute parts RoHS compliant?

A: DS1747-70IND is RoHS non-compliant. Both DS1747-70IND+ and BQ4802YDWR are ROHS3 compliant, meeting current environmental and regulatory standards.

Q: Which substitute part is recommended for new designs?

A: DS1747-70IND+ is recommended for new designs requiring through-hole mounting and industrial temperature range support. BQ4802YDWR is suitable for new surface-mount designs with commercial temperature range requirements and where enhanced features (alarm, watchdog timer) provide functional value.

Q: What is the impact of different current consumption between DS1747-70IND and BQ4802YDWR?

A: DS1747-70IND draws 4mA maximum at 5V during timekeeping operation. BQ4802YDWR draws 1.5mA typical at 4.5V ~ 5.5V, representing approximately 62.5% lower power consumption. This difference is significant for battery-backed or low-power applications.

Q: Are pin configurations identical between these parts?

A: No. DS1747-70IND uses 32-DIP package with specific pin assignments. BQ4802YDWR uses 28-SOIC package with different pin count and configuration. Direct pin-for-pin substitution is not possible; circuit redesign is required.