DS1337C Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS1337C is a Real Time Clock (RTC) IC with integrated clock/calendar functionality, designed for applications requiring accurate timekeeping and date tracking. This component operates via I2C 2-Wire Serial interface and supports both 12-hour and 24-hour time formats with alarm and leap year capabilities. The DS1337C is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

DS1337C

Analog Devices Inc./Maxim IntegratedIn Stock: 2254DS1337C Datasheet

Current PartRFQ

DS1337C#

Analog Devices Inc./Maxim IntegratedIn Stock: 22631DS1337C# Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1337C is determined by strict alignment across the following critical parameters:

• Package / Case: 16-SOIC (0.295", 7.50mm Width) — ensures mechanical and thermal compatibility
• Interface: I2C, 2-Wire Serial — guarantees protocol compatibility with existing circuit designs
• Voltage - Supply: 1.8V ~ 5.5V — confirms electrical compatibility with system power rails
• Current - Timekeeping (Max): 0.6µA @ 1.3V ~ 1.8V — ensures equivalent power consumption characteristics
• Operating Temperature: -40°C ~ 85°C — validates thermal operating range alignment
• Time Format: HH:MM:SS (12/24 hr) and Date Format: YY-MM-DD-dd — confirms functional feature parity
• Features: Alarm, Leap Year, Square Wave Output — ensures feature set compatibility

Only parts meeting all these criteria are classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The DS1337C# is a direct functional and electrical equivalent to the DS1337C. Both parts share identical electrical specifications, interface protocols, package geometry, and feature sets. The primary distinction lies in product status and regulatory compliance:

• DS1337C is classified as obsolete, with limited availability and no ongoing manufacturer support
• DS1337C# is classified as active, with current production and full manufacturer support

The DS1337C# additionally meets ROHS3 compliance requirements, whereas the DS1337C is RoHS non-compliant. For new designs, system upgrades, or applications requiring regulatory compliance, the DS1337C# is the appropriate selection. For legacy system maintenance requiring exact part matching, the DS1337C remains functionally equivalent where inventory permits.

Frequently Asked Questions (FAQ)

Q: Can DS1337C# be used as a direct replacement for DS1337C in existing designs?

A: Yes. The DS1337C# is electrically and functionally identical to the DS1337C across all critical parameters: package geometry, I2C interface, supply voltage range, timekeeping current, operating temperature, time/date formats, and feature set. No circuit modifications are required.

Q: What is the difference between DS1337C and DS1337C#?

A: The primary differences are product status and compliance. DS1337C is obsolete with RoHS non-compliant status. DS1337C# is active production with ROHS3 compliance. Electrical and functional specifications are identical.

Q: Are there packaging differences between these parts?

A: Both parts use 16-SOIC (0.295", 7.50mm Width) surface mount packages. The DS1337C# is supplied in Tube packaging, while the DS1337C packaging specification is not detailed. This does not affect electrical compatibility or board-level integration.

Q: Which part should be selected for new designs?

A: DS1337C# is the appropriate selection for new designs due to active production status, full manufacturer support, and ROHS3 compliance. The DS1337C is suitable only for legacy system maintenance where exact part matching is required.

Q: Are the I2C interface protocols identical between these parts?

A: Yes. Both parts implement identical I2C 2-Wire Serial interface protocols, time formats (HH:MM:SS with 12/24 hour support), date formats (YY-MM-DD-dd), and feature sets (Alarm, Leap Year, Square Wave Output).

Q: What are the supply voltage requirements for both parts?

A: Both DS1337C and DS1337C# operate across an identical supply voltage range of 1.8V to 5.5V, with timekeeping current consumption of 0.6µA maximum at 1.3V to 1.8V.