KSZ8873FLL Equivalent & Substitute Parts

Part Overview

The KSZ8873FLL is an Ethernet Switch IC manufactured by Microchip Technology, designed for 3-port switching applications with 100 Base-FX PHY support. This device operates across multiple supply voltages (1.8V, 2.5V, 3.3V) and integrates I2C and SPI interfaces for configuration and management. The part is currently in active production status with full RoHS3 compliance and REACH unaffected designation. Finding equivalent or substitute parts may be necessary due to inventory constraints, packaging preferences, or application-specific interface requirements.

Substiute Parts

KSZ8873FLL

Microchip TechnologyIn Stock: 1000450KSZ8873FLL Datasheet

Current PartRFQ

LAN9354/ML

Microchip TechnologyIn Stock: 1000493LAN9354/ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LAN9354/ML qualifies as a substitute for the KSZ8873FLL based on the following alignment criteria:

Common Functional Parameters:

• Manufacturer: Both manufactured by Microchip Technology
• Category: Both classified as Interface components
• Function: Both perform Ethernet switching with 3-port configuration
• Protocol: Both support Ethernet protocol
• Supply Voltage Range: Both operate within 1.8V to 3.3V envelope
• Operating Temperature: Both rated 0°C ~ 70°C
• Compliance: Both RoHS3 compliant and REACH unaffected
• MSL Rating: Both rated MSL 3 (168 Hours)
• Product Status: Both in active production

Allowable Variations:

• Standards: KSZ8873FLL supports 100 Base-FX PHY; LAN9354/ML supports 10/100 Base-T/TX PHY (broader capability)
• Interface: KSZ8873FLL provides I2C and SPI; LAN9354/ML provides I2C only (subset of original)
• Package: KSZ8873FLL uses 64-LQFP (10x10); LAN9354/ML uses 56-QFN (8x8) (different form factor)
• Supply Current: KSZ8873FLL specifies 115mA; LAN9354/ML not specified in provided data

Parameter Comparison

Engineering Selection Recommendations

Both the KSZ8873FLL and LAN9354/ML are active production components from Microchip Technology with identical compliance certifications (RoHS3, REACH unaffected) and matching MSL ratings. Selection between these parts depends on specific application requirements:

Select KSZ8873FLL when:

• 100 Base-FX PHY fiber optic interface is required
• SPI interface is necessary for system integration
• 64-LQFP package footprint is already established in PCB design

Select LAN9354/ML when:

• 10/100 Base-T/TX copper twisted-pair interface meets application needs
• I2C-only interface is sufficient for configuration
• Smaller 56-QFN (8x8) package footprint is preferred for space-constrained designs

Both parts maintain identical supply voltage ranges, operating temperature specifications, and regulatory compliance status, ensuring equivalent reliability and environmental performance in their respective application contexts.

Frequently Asked Questions (FAQ)

Q: Can LAN9354/ML directly replace KSZ8873FLL in existing designs?

A: Direct replacement requires PCB redesign due to different package types (64-LQFP versus 56-QFN). Additionally, if the original design relies on SPI interface or 100 Base-FX PHY fiber connectivity, the LAN9354/ML's I2C-only interface and 10/100 Base-T/TX PHY may not satisfy functional requirements.

Q: What are the key differences in Ethernet standards between these parts?

A: The KSZ8873FLL implements 100 Base-FX PHY for fiber optic connections at 100 Mbps. The LAN9354/ML implements 10/100 Base-T/TX PHY for copper twisted-pair connections at 10 or 100 Mbps. These represent different physical media and connector types.

Q: Are the interface protocols compatible?

A: Both parts support I2C for management and configuration. The KSZ8873FLL additionally provides SPI interface. If your application uses only I2C, both parts are compatible. If SPI is required, only the KSZ8873FLL is suitable.

Q: Do both parts have identical power supply requirements?

A: Both parts operate within the 1.8V to 3.3V supply voltage range. The KSZ8873FLL specifies 115mA supply current; the LAN9354/ML supply current is not provided in available documentation.

Q: What are the packaging implications for substitution?

A: The KSZ8873FLL uses 64-LQFP (10x10) package; the LAN9354/ML uses 56-QFN (8x8) package. These require different PCB footprints, via patterns, and thermal management approaches. Substitution requires complete PCB redesign.

Q: Are both parts equally available and compliant?

A: Both parts are in active production status with RoHS3 compliance and REACH unaffected designation. Both carry MSL 3 (168 Hours) moisture sensitivity rating, indicating equivalent handling and storage requirements.