DS1087LU-266 Equivalent & Substitute Parts

Part Overview

The DS1087LU-266 is a Clock Generator IC manufactured by Analog Devices Inc./Maxim Integrated, part of the EconOscillator™ series. This 8-pin surface mount device generates a 66.6MHz clock output from a clock input with a 2:1 input-to-output ratio. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives within the EconOscillator™ family provide functional equivalence while maintaining design compatibility.

Key Parameters

Parameter	DS1087LU-266
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Clock/Timing
Type	Clock Generator
Frequency - Max	66.6MHz
Input/Output	Clock / Clock
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the DS1087LU-266 is determined by the following critical parameters:

Electrical Compatibility:

Supply voltage range: 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
RoHS compliance: ROHS3 Compliant

Functional Parameters:

Input/Output signal type: Clock / Clock
Maximum frequency capability
Input-to-output ratio (2:1 or 1:1)

Substitute parts are grouped into two categories:

Direct Functional Equivalents (2:1 Ratio): Parts maintaining the 2:1 input-to-output ratio with maximum frequency at or above 66.6MHz, ensuring drop-in replacement capability.

Parametric Equivalents (1:1 Ratio): DS1089 series parts with 1:1 input-to-output ratio. These require circuit-level evaluation due to the different frequency multiplication characteristic, though they share identical package, voltage, temperature, and compliance specifications.

Parameter Comparison

Part Number	Manufacturer	Frequency - Max	Ratio - Input:Output	Voltage - Supply	Operating Temperature	Package / Case	Product Status	RoHS Status
DS1087LU-266	Analog Devices Inc./Maxim Integrated	66.6MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Obsolete	ROHS3 Compliant
DS1087LU-266+	Analog Devices Inc./Maxim Integrated	66.6MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-21H+	Analog Devices Inc./Maxim Integrated	16MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-23C+	Analog Devices Inc./Maxim Integrated	33.3MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-26A+	Analog Devices Inc./Maxim Integrated	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-40K+	Analog Devices Inc./Maxim Integrated	3.6864MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1087LU-4CL+	Analog Devices Inc./Maxim Integrated	66MHz	2:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-140+W	Analog Devices Inc./Maxim Integrated	66MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-22F+	Analog Devices Inc./Maxim Integrated	24.576MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-4CL+	Analog Devices Inc./Maxim Integrated	18.432MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant
DS1089LU-A29+	Analog Devices Inc./Maxim Integrated	66MHz	1:1	2.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

DS1087LU-266+ is the direct equivalent, maintaining identical electrical and functional specifications while offering active product status. This part is suitable for immediate substitution in existing designs.

Secondary Recommendations (2:1 Ratio, Active Status):

DS1087LU-26A+ and DS1087LU-4CL+ both provide 66MHz maximum frequency with 2:1 input-to-output ratio and active product status. These are functionally equivalent to the original DS1087LU-266 and suitable for new designs or production continuity.

DS1087LU-23C+ offers 33.3MHz maximum frequency with 2:1 ratio and active status, appropriate for applications requiring lower frequency operation within the same architecture.

DS1087LU-21H+ provides 16MHz maximum frequency with 2:1 ratio and active status for lower-frequency clock generation requirements.

DS1087LU-40K+ delivers 3.6864MHz maximum frequency with 2:1 ratio and active status for specialized timing applications.

Alternative Consideration (1:1 Ratio, Active Status):

DS1089 series parts (DS1089LU-140+W, DS1089LU-A29+) provide 66MHz maximum frequency with 1:1 input-to-output ratio. These require circuit redesign due to the different frequency multiplication characteristic and are suitable only when the 1:1 ratio aligns with system requirements.

All recommended parts maintain ROHS3 compliance, identical package specifications, and operating temperature range, ensuring mechanical and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can DS1087LU-266+ be used as a direct drop-in replacement for DS1087LU-266?

A: Yes. DS1087LU-266+ maintains identical electrical specifications, package, and functional characteristics. The primary difference is active product status versus obsolete status.

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

A: The DS1087 series provides a 2:1 input-to-output frequency ratio, while the DS1089 series provides a 1:1 ratio. This fundamental difference affects clock generation behavior and requires circuit-level evaluation before substitution.

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, ensuring mechanical compatibility with existing PCB layouts.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original DS1087LU-266.

Q: What supply voltage range applies to all substitute parts?

A: All substitute parts operate within the 2.7V to 3.6V supply voltage range, identical to the original part.

Q: Can I use a lower-frequency DS1087 variant if my application does not require 66.6MHz?

A: Yes, provided your circuit design accommodates the lower maximum frequency. DS1087LU-23C+ (33.3MHz), DS1087LU-21H+ (16MHz), and DS1087LU-40K+ (3.6864MHz) are all active alternatives with identical package and electrical specifications.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across -40°C to 85°C, matching the original DS1087LU-266 specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message