DS1337 Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The DS1337 is a Real Time Clock (RTC) IC with Clock/Calendar functionality, I2C 2-Wire Serial interface, and 8-DIP through-hole packaging manufactured by Analog Devices Inc./Maxim Integrated. The device is currently obsolete, with 2100 units in stock. The DS1337 provides timekeeping with alarm capability, leap year support, and square wave output across a supply voltage range of 1.8V to 5.5V. Due to its obsolete status, equivalent and substitute parts are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	DS1337 Specification
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Package Type	8-DIP (0.300", 7.62mm)
Interface	I2C, 2-Wire Serial
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage Supply Range	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.6µA @ 1.3V ~ 1.8V
Operating Temperature	-40°C ~ 85°C
Features	Alarm, Leap Year, Square Wave Output
RoHS Status	RoHS non-compliant
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the DS1337 is determined by the following critical parameters:

Interface Compatibility: All substitute parts maintain I2C 2-Wire Serial interface, ensuring software and protocol compatibility.

Functional Features: Substitute parts must support Clock/Calendar functionality with time format HH:MM:SS (12/24 hr) and date format YY-MM-DD-dd. Alarm and leap year support are required features present in all substitutes.

Voltage Supply Range: The DS1337 operates from 1.8V to 5.5V. Substitute parts are grouped by their supply voltage compatibility:

Full range compatibility (1.8V ~ 5.5V): DS1337+
Restricted range (2.7V ~ 5.5V or 3.3V ~ 5.5V): Requires voltage regulation assessment

Mounting and Packaging: Through-hole 8-DIP packaging is specific to the DS1337. Surface-mount alternatives (8-SOIC, 8-TSSOP, 8-MSOP) require PCB redesign and are listed as functional equivalents for new designs.

Product Status and Compliance: The DS1337 is obsolete and RoHS non-compliant. Active, RoHS3-compliant alternatives are available for new production.

Current Consumption: Low-power timekeeping current (0.6µA @ 1.3V ~ 1.8V) is a key parameter for battery-backed applications.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Voltage Supply	Timekeeping Current (Max)	Interface	Time Format	Product Status	RoHS Status
DS1337	Analog Devices Inc./Maxim Integrated	8-DIP (0.300", 7.62mm)	Through Hole	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	Obsolete	RoHS non-compliant
DS1337+	Analog Devices Inc./Maxim Integrated	8-DIP (0.300", 7.62mm)	Through Hole	1.8V ~ 5.5V	0.6µA @ 1.3V ~ 1.8V	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	Active	ROHS3 Compliant
1338-31DCGI8	Renesas Electronics Corporation	8-SOIC (0.154", 3.90mm)	Surface Mount	3.3V ~ 5.5V	5µA @ 3.63V ~ 5.5V	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	Active	ROHS3 Compliant
1339-31DVGI8	Renesas Electronics Corporation	8-TSSOP (0.118", 3.00mm)	Surface Mount	3.3V ~ 5.5V	200µA @ 3.63V ~ 5.5V	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	Active	ROHS3 Compliant
ISL12026IBZ-T	Renesas Electronics Corporation	8-SOIC (0.154", 3.90mm)	Surface Mount	2.7V ~ 5.5V	10µA ~ 20µA @ 2.7V ~ 5.5V	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	Active	ROHS3 Compliant
ISL12057IUZ-T	Renesas Electronics Corporation	8-TSSOP, 8-MSOP (0.118", 3.00mm)	Surface Mount	1.8V ~ 3.6V	0.65µA @ 1.8V	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	Active	ROHS3 Compliant
ISL12058IBZ-T	Renesas Electronics Corporation	8-SOIC (0.154", 3.90mm)	Surface Mount	1.8V ~ 3.6V	0.65µA @ 1.8V	I2C, 2-Wire Serial	HH:MM:SS (12/24 hr)	Active	ROHS3 Compliant
M41ST87WMX6TR	STMicroelectronics	28-SOIC (0.295", 7.50mm)	Surface Mount	2.7V ~ 3.6V	0.5mA @ 2.7V ~ 3.6V	I2C, 2-Wire Serial	HH:MM:SS:hh (24 hr)	Active	ROHS3 Compliant
M41T81SM6F	STMicroelectronics	8-SOIC (0.154", 3.90mm)	Surface Mount	2.7V ~ 5.5V	100µA @ 2.7V ~ 5.5V	I2C, 2-Wire Serial	HH:MM:SS:hh (24 hr)	Active	ROHS3 Compliant
M41T81SMY6F	STMicroelectronics	18-SOX (7.5mm Width)	Surface Mount	2.7V ~ 5.5V	100µA @ 2.7V ~ 5.5V	I2C, 2-Wire Serial	HH:MM:SS:hh (24 hr)	Active	ROHS3 Compliant
M41T82SM6F	STMicroelectronics	8-SOIC (0.154", 3.90mm)	Surface Mount	3V ~ 5.5V	10µA @ 5.5V	I2C, 2-Wire Serial	HH:MM:SS:hh (24 hr)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Pin-Compatible Replacement (Through-Hole): DS1337+ is the direct successor to DS1337, maintaining identical 8-DIP through-hole packaging, voltage supply range (1.8V ~ 5.5V), and functional specifications. DS1337+ is active and RoHS3 compliant, making it the preferred choice for existing through-hole designs requiring minimal PCB modification.

Surface-Mount Alternatives with Full Voltage Range: For designs transitioning to surface-mount technology while maintaining 1.8V ~ 5.5V supply compatibility, no direct equivalent exists. ISL12057IUZ-T and ISL12058IBZ-T operate at 1.8V ~ 3.6V, requiring voltage regulation if 5.5V operation is required.

Surface-Mount Alternatives with Extended Voltage Range: ISL12026IBZ-T (8-SOIC) and M41T81SM6F (8-SOIC) support 2.7V ~ 5.5V supply range. Both are active and RoHS3 compliant. ISL12026IBZ-T provides lower timekeeping current (10µA ~ 20µA) compared to M41T81SM6F (100µA).

Low-Power Battery-Backed Applications: ISL12057IUZ-T and ISL12058IBZ-T offer the lowest timekeeping current (0.65µA @ 1.8V), matching the DS1337 performance. These parts are suitable for battery-backed timekeeping but operate at reduced voltage range (1.8V ~ 3.6V).

All Substitute Parts: All listed substitutes maintain I2C 2-Wire Serial interface, Clock/Calendar functionality, and operating temperature range (-40°C ~ 85°C). All are RoHS3 compliant and active products.

Frequently Asked Questions (FAQ)

Q: Can DS1337+ be used as a direct replacement for DS1337? A: Yes. DS1337+ maintains identical 8-DIP through-hole packaging, voltage supply range (1.8V ~ 5.5V), timekeeping current (0.6µA @ 1.3V ~ 1.8V), and I2C interface. DS1337+ is active and RoHS3 compliant.

Q: What are the key differences between through-hole and surface-mount substitutes? A: DS1337 and DS1337+ use 8-DIP through-hole packaging. Surface-mount alternatives (1338-31DCGI8, ISL12026IBZ-T, M41T81SM6F, etc.) require PCB redesign and different assembly processes. Functional specifications remain compatible.

Q: Which substitute supports the full 1.8V ~ 5.5V voltage range of DS1337? A: DS1337+ is the only substitute maintaining the full 1.8V ~ 5.5V supply range in through-hole packaging. For surface-mount designs, no substitute provides identical voltage range. ISL12026IBZ-T and M41T81SM6F support 2.7V ~ 5.5V.

Q: Are all substitutes RoHS compliant? A: DS1337 is RoHS non-compliant. All listed substitutes (DS1337+, 1338-31DCGI8, ISL12026IBZ-T, ISL12057IUZ-T, ISL12058IBZ-T, M41ST87WMX6TR, M41T81SM6F, M41T81SMY6F, M41T82SM6F) are RoHS3 compliant.

Q: What is the timekeeping current difference between DS1337 and surface-mount alternatives? A: DS1337 draws 0.6µA @ 1.3V ~ 1.8V. ISL12057IUZ-T and ISL12058IBZ-T match this at 0.65µA @ 1.8V. Other surface-mount options draw higher current: ISL12026IBZ-T (10µA ~ 20µA), M41T81SM6F (100µA), M41T82SM6F (10µA @ 5.5V).

Q: Can substitutes with restricted voltage ranges replace DS1337 in 5.5V applications? A: Substitutes with voltage ranges below 5.5V (ISL12057IUZ-T and ISL12058IBZ-T at 1.8V ~ 3.6V) require voltage regulation or redesign for 5.5V operation. ISL12026IBZ-T and M41T81SM6F support up to 5.5V without modification.

Q: What packaging options are available for surface-mount designs? A: Surface-mount substitutes are available in 8-SOIC (1338-31DCGI8, ISL12026IBZ-T, ISL12058IBZ-T, M41T81SM6F, M41T82SM6F), 8-TSSOP/8-MSOP (1339-31DVGI8, ISL12057IUZ-T), 28-SOIC (M41ST87WMX6TR), and 18-SOX (M41T81SMY6F) packages.

Q: Do all substitutes support I2C 2-Wire Serial interface? A: Yes. All listed substitutes maintain I2C 2-Wire Serial interface compatibility with DS1337, ensuring software and protocol compatibility.

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