FTL4C1QL2C Equivalent & Substitute Parts

Part Overview

The FTL4C1QL2C is a QSFP+ transceiver module manufactured by Finisar Corporation, designed for 40 Gigabit Ethernet applications over 2 kilometers. This module operates at 1310nm wavelength with a supply voltage range of 3.1V to 3.47V and features LC duplex connectors in a pluggable QSFP+ form factor.

The FTL4C1QL2C is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain system compatibility and ensure continued availability for deployment and replacement scenarios in existing network infrastructure.

Substiute Parts

FTL4C1QL2C

Finisar CorporationIn Stock: 963FTL4C1QL2C Datasheet

Current PartRFQ

FTL4C1QL3C

CoherentIn Stock: 1018FTL4C1QL3C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FTL4C1QL2C is determined by the following critical parameters:

• Mounting Type & Form Factor: Must be Pluggable QSFP+ to ensure physical compatibility with existing socket infrastructure
• Connector Type: Must be LC Duplex to maintain fiber optic interface compatibility
• Voltage Supply Range: Must support 3.1V to 3.47V operation to ensure electrical compatibility with host equipment
• Applications: Must support Ethernet protocol for network deployment
• Data Rate Compatibility: Must support 40 Gbps or higher to maintain or exceed performance specifications
• Wavelength: Must operate at or near 1310 nm for optical path compatibility in existing network designs

The FTL4C1QL3C from Coherent meets these substitution criteria. While it operates at multiple wavelengths (1271nm, 1291nm, 1311nm, 1331nm) and a slightly higher data rate (41.2 Gbps), it maintains full compatibility with the mechanical, electrical, and protocol requirements of the FTL4C1QL2C.

Parameter Comparison

Engineering Selection Recommendations

The FTL4C1QL3C is the manufacturer-recommended substitute for the FTL4C1QL2C. Selection of this substitute is supported by the following factors:

• Product Status: The FTL4C1QL3C maintains active product status, ensuring ongoing availability and support, whereas the FTL4C1QL2C is obsolete
• Compliance: Both modules meet RoHS requirements; the FTL4C1QL3C achieves ROHS3 compliance, representing current environmental standards
• Electrical Compatibility: Identical voltage supply range (3.1V – 3.47V) ensures direct compatibility with existing host equipment without modification
• Physical Compatibility: Identical connector type (LC Duplex) and mounting type (Pluggable QSFP+) guarantee mechanical interchangeability
• Performance: The FTL4C1QL3C exceeds the data rate specification (41.2 Gbps vs. 40 Gbps) and supports the 1311 nm wavelength within its multi-wavelength capability, maintaining compatibility with 1310 nm optical paths

Frequently Asked Questions (FAQ)

Q: Can the FTL4C1QL3C be directly installed in place of the FTL4C1QL2C?

A: Yes. Both modules share identical mounting type (Pluggable QSFP+), connector type (LC Duplex), and voltage supply range (3.1V – 3.47V). Physical and electrical installation is direct without modification.

Q: Does the wavelength difference affect compatibility?

A: The FTL4C1QL3C supports 1311 nm within its multi-wavelength capability, which is within the optical compatibility range of systems designed for 1310 nm operation. The substitute maintains functional compatibility with existing 1310 nm optical infrastructure.

Q: What is the significance of the higher data rate in the FTL4C1QL3C?

A: The FTL4C1QL3C operates at 41.2 Gbps compared to the FTL4C1QL2C at 40 Gbps. This represents a performance increase and ensures the substitute meets or exceeds the original specification. Host equipment rated for 40 Gbps operation will function correctly with the higher-rated module.

Q: Are there any compliance differences between the two modules?

A: Both modules are RoHS compliant. The FTL4C1QL3C achieves ROHS3 compliance, which represents current environmental and hazardous substance restrictions. This is an improvement over the original RoHS compliance of the FTL4C1QL2C.

Q: Why is the FTL4C1QL2C classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The FTL4C1QL3C is the active replacement, ensuring continued availability and support for 40 Gigabit Ethernet QSFP+ transceiver applications.