DS1087LU-W3C Equivalent & Substitute Parts

Part Overview

The DS1087LU-W3C is a Clock Generator IC manufactured by Analog Devices Inc./Maxim Integrated, part of the EconOscillator™ series. This 8-pin surface mount device generates clock signals up to 66MHz with a 2:1 input-to-output ratio, operating from 2.7V to 3.6V supply voltage across the temperature range of -40°C to 85°C. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Key Parameters

Parameter	Value
Manufacturer	Analog Devices Inc./Maxim Integrated
Series	EconOscillator™
Type	Clock Generator
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Frequency - Max	66MHz
Voltage - Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Ratio - Input:Output	2:1
Mounting Type	Surface Mount
Number of Circuits	1
Divider/Multiplier	Yes/No
PLL	No

Substitute Part Grouping Explanation

Substitution for the DS1087LU-W3C is determined by strict adherence to the following parameters: package type (8-TSSOP, 8-MSOP), supply voltage range (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), number of circuits (1), and functional input/output configuration. The maximum frequency capability and input-to-output ratio are critical differentiators.

Substitute parts are grouped into two categories:

Direct Substitutes (DS1087 Series with 2:1 Ratio): Parts maintaining the 2:1 input-to-output ratio with identical package and electrical specifications. These include DS1087LU-23C+T, DS1087LU-21H+, DS1087LU-23C+, DS1087LU-26A+, and DS1087LU-4CL+. Frequency variations (3.6864MHz to 66MHz) are application-dependent selections within the same functional architecture.

Parametric Equivalents (DS1089 Series with 1:1 Ratio): Parts with identical package, supply voltage, and temperature specifications but featuring a 1:1 input-to-output ratio instead of 2:1. These include DS1089LU-140+W, DS1089LU-22F+, DS1089LU-4CL+, and DS1089LU-A29+. The DS1089 series represents a different functional topology suitable for applications requiring unity ratio clock generation.

Parameter Comparison

Part Number	Product Status	Frequency - Max	Ratio - Input:Output	Voltage - Supply	Operating Temperature	Package / Case	RoHS Status
DS1087LU-W3C	Obsolete	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	RoHS non-compliant
DS1087LU-23C+T	Active	33.3MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1087LU-21H+	Active	16MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1087LU-23C+	Active	33.3MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1087LU-26A+	Active	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1087LU-40K+	Active	3.6864MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1087LU-4CL+	Active	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1089LU-140+W	Active	66MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1089LU-22F+	Active	24.576MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1089LU-4CL+	Active	18.432MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant
DS1089LU-A29+	Active	66MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct functional replacement of the DS1087LU-W3C with identical 2:1 clock division architecture, select from the active DS1087 series parts. DS1087LU-26A+ and DS1087LU-4CL+ provide 66MHz maximum frequency matching the original specification and are ROHS3 compliant with unlimited moisture sensitivity rating. Both are currently in active production status with substantial inventory availability.

For designs where clock division ratio can be modified to 1:1, the DS1089 series offers equivalent electrical and mechanical compatibility. DS1089LU-140+W and DS1089LU-A29+ both support 66MHz operation and are ROHS3 compliant. The DS1089 series provides an alternative topology for new designs or redesigns where the input-to-output ratio adjustment is feasible.

All substitute parts share identical package geometry (8-TSSOP, 8-MSOP), supply voltage range (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and mounting type (surface mount), ensuring mechanical and electrical compatibility at the board level. Selection should be based on required frequency specification and whether the 2:1 or 1:1 clock ratio is appropriate for the application.

Frequently Asked Questions (FAQ)

Q: Can DS1087LU-26A+ directly replace DS1087LU-W3C in existing designs?

A: Yes. DS1087LU-26A+ maintains identical package (8-TSSOP, 8-MSOP), supply voltage (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and 2:1 input-to-output ratio. Maximum frequency is 66MHz, matching the original specification. The part is ROHS3 compliant and in active production.

Q: What is the difference between DS1087 and DS1089 series substitutes?

A: The DS1087 series maintains a 2:1 input-to-output ratio identical to the original DS1087LU-W3C. The DS1089 series features a 1:1 input-to-output ratio, representing a different functional topology. Both series share identical package, supply voltage, and temperature specifications. Selection depends on whether your application requires clock division (2:1) or unity ratio (1:1) operation.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The original DS1087LU-W3C is RoHS non-compliant. If RoHS compliance is required for your application, any of the listed substitutes satisfy this requirement.

Q: What packaging options are available for substitutes?

A: DS1087LU-23C+T is supplied in Tape & Reel (TR) packaging. DS1087LU-21H+, DS1087LU-23C+, DS1087LU-26A+, DS1087LU-40K+, DS1087LU-4CL+, DS1089LU-22F+, DS1089LU-4CL+, and DS1089LU-A29+ are supplied in Tube packaging. DS1089LU-140+W has unspecified packaging. All parts use the identical 8-TSSOP, 8-MSOP case outline.

Q: Can I use a lower frequency substitute if my application does not require 66MHz?

A: Yes. If your application requires lower clock frequencies, DS1087LU-21H+ (16MHz), DS1087LU-23C+ (33.3MHz), or DS1087LU-40K+ (3.6864MHz) are available as 2:1 ratio alternatives. All maintain identical package, supply voltage, and temperature specifications. Frequency selection should match your system requirements.

Q: What is the moisture sensitivity level for substitute parts?

A: All substitute parts have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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