DS1087LU-4CL Clock Generator IC 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-TSSOP surface mount device generates 66MHz clock signals with a 2:1 input-to-output ratio. 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 Part Number	DS1087LU-4CL
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock Generator
Frequency - Max	66MHz
Ratio - Input:Output	2:1
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
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the DS1087LU-4CL is determined by the following critical parameters:

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
Number of Circuits: 1
Input/Output Type: Clock

Secondary Substitution Criteria:

Frequency - Max: 66MHz (exact match preferred)
Ratio - Input:Output: 2:1 (for DS1087 series) or 1:1 (for DS1089 series)
Divider/Multiplier: Yes/No capability

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

Category A - DS1087 Series (2:1 Ratio): Direct functional equivalents with identical input-to-output ratio. These parts maintain the same frequency multiplication characteristic as the main part.

Category B - DS1089 Series (1:1 Ratio): Alternative clock generators with 1:1 input-to-output ratio. These provide clock generation functionality but with different frequency scaling characteristics.

Parameter Comparison

Part Number	Frequency - Max	Ratio - Input:Output	Voltage - Supply	Operating Temperature	Package / Case	Product Status	RoHS Status
DS1087LU-4CL	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Obsolete	RoHS non-compliant
DS1087LU-21H+	16MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-23C+	33.3MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-26A+	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-40K+	3.6864MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-4CL+	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-140+W	66MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-22F+	24.576MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-4CL+	18.432MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-A29+	66MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-C29+W	66MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - DS1087LU-26A+

DS1087LU-26A+ is the closest functional equivalent to DS1087LU-4CL. Both parts share identical electrical specifications: 66MHz maximum frequency, 2:1 input-to-output ratio, 2.7V to 3.6V supply voltage, and -40°C to 85°C operating temperature range. The DS1087LU-26A+ is in active product status with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance issues of the original part. Packaging and mounting characteristics are identical.

Alternative Recommendation - DS1087LU-4CL+

DS1087LU-4CL+ provides identical electrical and mechanical specifications to the main part with the advantage of active product status and ROHS3 compliance. This part maintains the same 66MHz frequency and 2:1 ratio, making it a direct replacement with improved compliance posture.

Frequency-Specific Alternatives - DS1087 Series

For applications where frequency requirements differ from 66MHz, the DS1087 series offers active alternatives:

DS1087LU-23C+ (33.3MHz) for half-frequency applications
DS1087LU-21H+ (16MHz) for lower-frequency requirements
DS1087LU-40K+ (3.6864MHz) for specialized timing applications

All maintain the 2:1 input-to-output ratio and identical package specifications.

Alternative Architecture - DS1089 Series

The DS1089 series provides clock generation with 1:1 input-to-output ratio. These parts are suitable only when the frequency multiplication characteristic is not required. DS1089LU-140+W and DS1089LU-A29+ both support 66MHz operation with 1:1 ratio. Selection within this series depends on specific frequency requirements and application constraints.

Frequently Asked Questions (FAQ)

Q: Can DS1087LU-4CL be directly replaced with DS1087LU-26A+?

A: Yes. Both parts have identical electrical specifications (66MHz, 2:1 ratio, 2.7V-3.6V supply, -40°C to 85°C operating range) and package configuration (8-TSSOP, 8-MSOP). DS1087LU-26A+ is active and ROHS3 compliant, making it a direct replacement.

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

A: The primary difference is the input-to-output ratio. DS1087 series provides 2:1 frequency multiplication, while DS1089 series provides 1:1 frequency pass-through. Both series share identical package, voltage, and temperature specifications. Selection depends on whether frequency multiplication is required in the application.

Q: Is the DS1087LU-4CL+ the same as DS1087LU-4CL?

A: Electrically and mechanically, yes. The "+" suffix indicates packaging in tube format and ROHS3 compliance. The original DS1087LU-4CL is obsolete and RoHS non-compliant. DS1087LU-4CL+ is the active equivalent with improved compliance status.

Q: Can I use a lower-frequency DS1087 part as a substitute?

A: Substitution with lower-frequency DS1087 parts (such as DS1087LU-23C+ at 33.3MHz or DS1087LU-21H+ at 16MHz) is possible only if your application can operate at the lower frequency. All DS1087 variants maintain the 2:1 ratio and identical package specifications, but frequency requirements must be verified for your specific design.

Q: What does the 2:1 ratio mean in the DS1087 series?

A: The 2:1 input-to-output ratio means the output frequency is twice the input frequency. For example, a 33MHz input produces a 66MHz output. This is a frequency multiplication characteristic inherent to the DS1087 architecture.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitute parts use the 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) surface mount package. PCB layout and footprint compatibility is maintained across all substitutes.

Q: Why is RoHS compliance important for this substitution?

A: The original DS1087LU-4CL is RoHS non-compliant. Modern manufacturing and procurement standards increasingly require ROHS3 compliance. Active substitute parts (DS1087LU-26A+, DS1087LU-4CL+, and all DS1089 variants) meet ROHS3 requirements, ensuring compatibility with current supply chain and regulatory requirements.

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