DS1087LU-4CL+ Equivalent & Substitute Parts

Part Overview

The DS1087LU-4CL+ is a Clock Generator IC manufactured by Analog Devices Inc./Maxim Integrated, part of the EconOscillator™ series. This 8-pin surface mount device operates at 66MHz maximum frequency with a 2:1 input-to-output ratio and is designed for applications requiring clock signal generation and distribution. The part is Active status and ROHS3 compliant, making it suitable for modern electronic designs. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, design flexibility, or application-specific frequency requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	DS1087LU-4CL+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock Generator
Frequency - Max	66MHz
Voltage - Supply	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Ratio - Input:Output	2:1
Number of Circuits	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DS1087LU-4CL+ are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Voltage - Supply: 2.7V ~ 3.6V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount
Series: EconOscillator™
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Variation Parameters:

Frequency - Max: Varies by part number (3.6864MHz to 66MHz)
Ratio - Input:Output: 2:1 (DS1087 series) or 1:1 (DS1089 series)
Base Product Number: DS1087, DS1087L, or DS1089

Parts within the DS1087 series maintain a 2:1 input-to-output ratio, while DS1089 series parts provide a 1:1 ratio. Frequency selection depends on application requirements. All substitute parts share identical electrical supply, temperature range, and physical packaging specifications.

Parameter Comparison

Part Number	Frequency - Max	Ratio - Input:Output	Base Product	Voltage - Supply	Operating Temperature	Package / Case	Inventory (Pcs)
DS1087LU-4CL+	66MHz	2:1	DS1087	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	766
DS1087LU-21H+	16MHz	2:1	DS1087	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	1350
DS1087LU-23C+	33.3MHz	2:1	DS1087	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	900
DS1087LU-26A+	66MHz	2:1	DS1087L	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	703
DS1087LU-40K+	3.6864MHz	2:1	DS1087	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	814
DS1089LU-140+W	66MHz	1:1	DS1089	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	956
DS1089LU-22F+	24.576MHz	1:1	DS1089	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	945
DS1089LU-4CL+	18.432MHz	1:1	DS1089L	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	994
DS1089LU-A29+	66MHz	1:1	DS1089	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	631
DS1089LU-C29+W	66MHz	1:1	DS1089	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	777

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring compatibility with current manufacturing standards and environmental regulations. Selection between DS1087 and DS1089 series depends on the input-to-output ratio requirement: DS1087 series provides 2:1 ratio matching the DS1087LU-4CL+, while DS1089 series provides 1:1 ratio for applications requiring unity gain.

For direct functional replacement of DS1087LU-4CL+ at 66MHz with 2:1 ratio, DS1087LU-26A+ is the equivalent option. DS1087LU-23C+ and DS1087LU-21H+ are suitable when lower frequency operation is acceptable within the 2:1 ratio architecture. DS1089 series parts are suitable only when 1:1 ratio operation is required and frequency specifications align with application needs.

All parts share identical supply voltage range (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), physical package dimensions (8-TSSOP, 8-MSOP, 0.118" × 3.00mm), and moisture sensitivity classification (MSL 1). Surface mount mounting type is consistent across all options.

Frequently Asked Questions (FAQ)

Q: Can DS1089 series parts directly replace DS1087LU-4CL+?

A: DS1089 series parts share identical electrical supply, temperature range, and physical packaging but differ in input-to-output ratio (1:1 versus 2:1). Direct replacement is possible only if the application circuit is designed to accept 1:1 ratio operation. Circuit redesign may be required.

Q: What is the difference between DS1087LU-26A+ and DS1087LU-4CL+?

A: Both parts operate at 66MHz with 2:1 ratio, identical supply voltage (2.7V ~ 3.6V), and same package (8-TSSOP, 8-MSOP). The base product designation differs (DS1087L versus DS1087), but electrical and mechanical parameters are equivalent for substitution purposes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and handling specifications of DS1087LU-4CL+.

Q: Can I use DS1087LU-21H+ or DS1087LU-23C+ if my application requires 66MHz?

A: No. DS1087LU-21H+ operates at 16MHz maximum and DS1087LU-23C+ at 33.3MHz maximum. These parts are not suitable for applications requiring 66MHz operation. Use DS1087LU-26A+ for equivalent 66MHz performance with 2:1 ratio.

Q: What packaging options are available for these parts?

A: All substitute parts use 8-TSSOP or 8-MSOP surface mount package with 0.118" width and 3.00mm body width. Physical footprint and PCB layout compatibility are identical across all options.

Q: Does frequency selection affect supply voltage or temperature range?

A: No. All substitute parts maintain identical supply voltage range (2.7V ~ 3.6V) and operating temperature range (-40°C ~ 85°C) regardless of frequency rating. Frequency selection is independent of electrical supply and thermal specifications.

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