FCLF-8521-3 Equivalent & Substitute Parts

Part Overview

The FCLF-8521-3 is a Copper SFP transceiver module manufactured by Finisar Corporation, designed for Ethernet applications at 1.25Gbps data rate. This module operates at 3.3V supply voltage with RJ45 connector interface in a pluggable SFP form factor. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance, upgrades, and continued deployment in active network infrastructure.

Substiute Parts

FCLF-8521-3

Finisar CorporationIn Stock: 1309FCLF-8521-3 Datasheet

Current PartRFQ

FCLF8521P2BTL

CoherentIn Stock: 2689FCLF8521P2BTL Datasheet

DirectRFQ

FCLF8522P2BTL

CoherentIn Stock: 1176FCLF8522P2BTL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FCLF-8521-3 are identified based on strict alignment of the following critical parameters:

• Data Rate: 1.25Gbps
• Voltage - Supply: 3.3V
• Connector Type: RJ45
• Mounting Type: Pluggable, SFP Copper
• Applications: Ethernet
• Moisture Sensitivity Level: 1 (Unlimited)

Two substitute parts meet these criteria. FCLF8522P2BTL maintains identical data rate (1.25Gbps), voltage, connector type, and form factor, with active product status and RoHS3 compliance. FCLF8521P2BTL operates at 1000Mbps data rate, which is lower than the original specification but maintains all other critical electrical and mechanical parameters, also with active status and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

FCLF8522P2BTL is the primary substitute for FCLF-8521-3. Both modules operate at identical 1.25Gbps data rate with matching electrical and mechanical specifications. FCLF8522P2BTL carries active product status and RoHS3 compliance certification, ensuring long-term availability and regulatory alignment for new deployments.

FCLF8521P2BTL is a secondary substitute option. While it maintains all critical electrical and mechanical parameters, its 1000Mbps data rate is lower than the original 1.25Gbps specification. This part is suitable only for applications where reduced bandwidth is acceptable. FCLF8521P2BTL also carries active product status and RoHS3 compliance.

Both substitute parts are manufactured by Coherent and share identical supply voltage, connector type, form factor, and MSL rating with the original FCLF-8521-3.

Frequently Asked Questions (FAQ)

Q: Can FCLF8522P2BTL directly replace FCLF-8521-3 in existing systems?

A: Yes. FCLF8522P2BTL matches all critical parameters: 1.25Gbps data rate, 3.3V supply voltage, RJ45 connector, and pluggable SFP copper form factor. Both modules are designed for Ethernet applications with identical MSL rating.

Q: What is the difference between FCLF8522P2BTL and FCLF8521P2BTL?

A: The primary difference is data rate. FCLF8522P2BTL operates at 1.25Gbps, matching the original FCLF-8521-3 specification. FCLF8521P2BTL operates at 1000Mbps. Both share identical voltage, connector type, form factor, and MSL rating.

Q: Why is FCLF-8521-3 listed as obsolete?

A: Finisar Corporation has discontinued this part number. Active substitute parts from Coherent are available with equivalent or superior specifications and current product status.

Q: Does packaging type affect electrical compatibility?

A: No. Packaging type (Tray for FCLF8522P2BTL, Bulk for FCLF8521P2BTL) affects handling and storage logistics only. Electrical and mechanical specifications remain identical regardless of packaging format.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both FCLF8522P2BTL and FCLF8521P2BTL carry RoHS3 compliance certification, meeting current regulatory requirements for electronic components.

Q: Which substitute should be selected for new system designs?

A: FCLF8522P2BTL is the recommended choice for new designs, as it maintains the original 1.25Gbps data rate specification and carries active product status with RoHS3 compliance.