DS1087LU-4CL/T&R Equivalent & Substitute Parts

Part Overview

The DS1087LU-4CL/T&R is a Clock Generator IC manufactured by Analog Devices Inc./Maxim Integrated, part of the EconOscillator™ series. This 8-TSSOP surface mount device operates at a maximum frequency of 66MHz with a 2:1 input-to-output ratio and supports clock division/multiplication functionality. The part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

DS1087LU-4CL/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 1064DS1087LU-4CL/T&R Datasheet

Current PartRFQ

DS1087LU-21H+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 1210DS1087LU-21H+T&R Datasheet

Parametric EquivalentRFQ

DS1087LU-23C+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3077DS1087LU-23C+T Datasheet

Parametric EquivalentRFQ

DS1087LU-26A+T

Analog Devices Inc./Maxim IntegratedIn Stock: 645DS1087LU-26A+T Datasheet

Parametric EquivalentRFQ

DS1087LU-40K+T

Analog Devices Inc./Maxim IntegratedIn Stock: 941DS1087LU-40K+T Datasheet

Parametric EquivalentRFQ

DS1089LU-4CL+T

Analog Devices Inc./Maxim IntegratedIn Stock: 740DS1089LU-4CL+T Datasheet

Parametric EquivalentRFQ

DS1089LU-A29+TW

Analog Devices Inc./Maxim IntegratedIn Stock: 818DS1089LU-A29+TW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1087LU-4CL/T&R is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Mounting Type: Surface Mount
• Voltage - Supply: 2.7V ~ 3.6V
• Operating Temperature: -40°C ~ 85°C
• Category: Clock/Timing / Type: Clock Generator

Frequency and Functional Parameters:

• Maximum frequency capability must meet or exceed application requirements
• Input-to-output ratio determines clock division/multiplication behavior
• Divider/Multiplier functionality availability

Substitute parts are grouped into two functional categories based on input-to-output ratio:

Group 1: 2:1 Ratio Parts (Direct Functional Equivalents)

• DS1087LU-21H+T&R (16MHz)
• DS1087LU-23C+T (33.3MHz)
• DS1087LU-26A+T (66MHz)
• DS1087LU-40K+T (3.6864MHz)

Group 2: 1:1 Ratio Parts (Alternative Functional Configuration)

• DS1089LU-4CL+T (18.432MHz)
• DS1089LU-A29+TW (66MHz)

Parameter Comparison

Engineering Selection Recommendations

For Direct Functional Replacement (2:1 Ratio Preservation):

DS1087LU-26A+T is the primary active substitute for the DS1087LU-4CL/T&R. Both parts maintain identical maximum frequency (66MHz) and input-to-output ratio (2:1), ensuring functional equivalence in clock division applications. DS1087LU-26A+T is active in production status and ROHS3 compliant, addressing the obsolescence and compliance limitations of the original part.

DS1087LU-23C+T and DS1087LU-21H+T&R are active alternatives within the 2:1 ratio family, suitable for applications where lower maximum frequencies (33.3MHz and 16MHz respectively) are acceptable. DS1087LU-40K+T serves specialized applications requiring 3.6864MHz output.

For Alternative Functional Configuration (1:1 Ratio):

DS1089LU-A29+TW provides 66MHz operation with a 1:1 input-to-output ratio, applicable where clock multiplication is not required. DS1089LU-4CL+T operates at 18.432MHz with 1:1 ratio functionality. Both DS1089 series parts are active and ROHS3 compliant.

All substitute parts share identical package geometry, supply voltage range, and operating temperature specifications with the original part, ensuring PCB-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can DS1087LU-26A+T directly replace DS1087LU-4CL/T&R?

A: Yes. Both parts operate at 66MHz maximum frequency with 2:1 input-to-output ratio, identical supply voltage (2.7V ~ 3.6V), operating temperature range (-40°C ~ 85°C), and package configuration (8-TSSOP, 8-MSOP). DS1087LU-26A+T is active in production and ROHS3 compliant, whereas the original part is obsolete and RoHS non-compliant.

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

A: The primary functional difference is the input-to-output ratio. DS1087 series parts operate with 2:1 ratio (clock division), while DS1089 series parts operate with 1:1 ratio (no division). Both series share identical package, voltage, and temperature specifications. Selection depends on whether clock division functionality is required in the application.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) package configuration, ensuring direct PCB compatibility without layout modifications.

Q: Why is RoHS compliance important for this substitution?

A: The original DS1087LU-4CL/T&R is RoHS non-compliant. All active substitute parts (DS1087LU-26A+T, DS1087LU-23C+T, DS1087LU-21H+T&R, DS1087LU-40K+T, DS1089LU-4CL+T, DS1089LU-A29+TW) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and procurement.

Q: Which substitute part should I select if my application requires 66MHz operation?

A: For 2:1 ratio applications, select DS1087LU-26A+T. For 1:1 ratio applications, select DS1089LU-A29+TW. Both operate at 66MHz maximum frequency and are active, ROHS3 compliant alternatives to the obsolete original part.

Q: Are there frequency-specific variants available?

A: Yes. The DS1087 series offers multiple frequency options: 3.6864MHz (DS1087LU-40K+T), 16MHz (DS1087LU-21H+T&R), 33.3MHz (DS1087LU-23C+T), and 66MHz (DS1087LU-26A+T). Selection should match application frequency requirements while maintaining the required input-to-output ratio.