KS8721SL Equivalent & Substitute Parts

Part Overview

The KS8721SL is a full-duplex IEEE 802.3 transceiver IC manufactured by Microchip Technology, housed in a 48-SSOP surface mount package. This component is classified as a discontinued product at DiGi Electronics, with 6471 units currently in stock. The KS8721SL operates within a supply voltage range of 2.375V to 2.625V and supports operating temperatures from 0°C to 70°C. Due to its discontinued status and non-RoHS compliance, identifying equivalent substitute parts is essential for ongoing design support, inventory management, and new production requirements.

Substiute Parts

KS8721SL

Microchip TechnologyIn Stock: 6496KS8721SL Datasheet

Current PartRFQ

KSZ8721SL

Microchip TechnologyIn Stock: 4221KSZ8721SL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The KSZ8721SL qualifies as a direct substitute for the KS8721SL based on the following alignment of critical parameters:

Matching Parameters:

• Manufacturer: Microchip Technology (same source)
• Type: Transceiver with identical functional classification
• Protocol: IEEE 802.3 (same communication standard)
• Number of Drivers/Receivers: 1/1 (identical configuration)
• Duplex Mode: Full (identical duplex capability)
• Package / Case: 48-BSSOP (0.295", 7.50mm Width) (identical physical footprint)
• Mounting Type: Surface Mount (identical mounting method)
• Operating Temperature Range: 0°C ~ 70°C (identical thermal operating window)
• Moisture Sensitivity Level (MSL): 3 (168 Hours) (identical moisture handling requirement)

Differing Parameters:

• Voltage - Supply: KS8721SL operates at 2.375V ~ 2.625V; KSZ8721SL operates at 3V ~ 3.6V
• Product Status: KS8721SL is discontinued; KSZ8721SL is active
• RoHS Status: KS8721SL is non-compliant; KSZ8721SL is ROHS3 compliant

The voltage supply difference represents the primary technical distinction. Design integration of the KSZ8721SL requires verification that the target application's power supply architecture can accommodate the 3V ~ 3.6V operating range.

Parameter Comparison

Engineering Selection Recommendations

The KSZ8721SL is the direct equivalent substitute for the discontinued KS8721SL. Selection of the KSZ8721SL provides the following advantages:

Product Availability: The KSZ8721SL maintains active product status with 4194 units in current inventory, ensuring long-term supply chain continuity compared to the discontinued KS8721SL.

Regulatory Compliance: The KSZ8721SL achieves ROHS3 compliance, meeting modern environmental and regulatory requirements. The KS8721SL's non-compliant status may present obstacles for new designs or markets with RoHS mandates.

Functional Equivalence: Both parts maintain identical IEEE 802.3 transceiver functionality, 1/1 driver/receiver configuration, full-duplex operation, and identical physical packaging (48-BSSOP), ensuring direct PCB compatibility without layout modifications.

Supply Voltage Consideration: The primary design integration factor is the supply voltage differential. Applications currently operating the KS8721SL at 2.375V ~ 2.625V must confirm that system power architecture can be adjusted to the KSZ8721SL's 3V ~ 3.6V range, or implement appropriate voltage regulation circuitry.

Frequently Asked Questions (FAQ)

Q: Can the KSZ8721SL be used as a direct replacement for the KS8721SL without PCB modifications?

A: Yes, from a physical and functional standpoint. Both parts use the identical 48-BSSOP package footprint and pinout. However, the supply voltage requirement differs (2.375V ~ 2.625V versus 3V ~ 3.6V), which may require power supply circuit adjustments depending on your application's current voltage architecture.

Q: What is the primary reason for substituting the KS8721SL with the KSZ8721SL?

A: The KS8721SL is discontinued at DiGi Electronics, making long-term procurement difficult. The KSZ8721SL is an active product from the same manufacturer with identical transceiver specifications, ensuring continued availability and supply chain stability.

Q: Are there any compliance differences between these parts?

A: Yes. The KSZ8721SL is ROHS3 compliant, while the KS8721SL is RoHS non-compliant. For new designs or applications subject to RoHS regulations, the KSZ8721SL is the appropriate choice.

Q: Do both parts operate across the same temperature range?

A: Yes. Both the KS8721SL and KSZ8721SL operate across the identical 0°C to 70°C temperature range, ensuring thermal compatibility in equivalent applications.

Q: What is the moisture sensitivity level for these parts?

A: Both parts carry an MSL rating of 3 (168 Hours), indicating identical moisture handling and storage requirements during manufacturing and assembly processes.

Q: Are the IEEE 802.3 protocol implementations identical between these parts?

A: Yes. Both parts implement full-duplex IEEE 802.3 transceiver functionality with 1/1 driver/receiver configuration, ensuring protocol-level compatibility.