Mfr Part #:

KSZ8721B

Mfr Name: MIC

The MIC KSZ8721B is a 2.5V Physical Layer Transceiver designed for 10/100BaseTX/FX Ethernet applications. It provides an MII interface and supports auto-negotiation for speed and duplex modes.

✓ Total Stock: 8,090 pcs

$ Price Range: $12.91

KSZ8721B Available from 1 distributor

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Fe Components ✓ Non-Authorised Inventory information	8,090 pcs On Request	8090 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

KSZ8721B Description

Short technical summary and product information.

The MIC KSZ8721B is a single-chip 2.5V CMOS Physical Layer Transceiver that supports 10BaseT, 100BaseTX, and 100BaseFX Ethernet standards. It operates at 2.5 volts, meeting low voltage and low power requirements with consumption under 200mW. The device provides an MII interface for transmitting and receiving data and includes on-chip filtering for both 100BaseTX and 10BaseT, eliminating the need for external filters.

This transceiver is fully compliant with the IEEE 802.3u standard and features an on-chip Auto-Negotiation algorithm, allowing it to automatically configure for 10 or 100 Mbps and full or half duplex operation. It also supports Reduced MII (RMII) and includes features like Far_End_Fault Detection, power down mode, and power saving mode. The KSZ8721B is configurable via MII serial management ports or external control pins and offers LED outputs for link, activity, duplex, collision, and speed status.

Available in 48-pin SSOP and TQFP packages, the KSZ8721B is suitable for commercial (0°C to +70°C) and industrial (–40°C to +85°C) temperature ranges. It supports MDI/MDI-X auto crossover and has 2.5V/3.3V tolerance on its I/O pins, making it an ideal choice for 100BaseTX/10BaseT applications and media converter designs.

KSZ8721B Quick Information

Product Type: Physical Layer Transceiver

Canonical Name: KSZ8721B 2.5V 10/100BaseTX/FX MII Physical Layer Transceiver

Subcategory: Ethernet Transceiver

KSZ8721B Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

KSZ8721B Estimated Pricing

Qty	Low	High
1+	$12.91	$12.91

Estimated market price range - modelled values for guidance only, not live distributor offers.

KSZ8721B Features

Single chip 100BaseTX/100BaseFX/10BaseT solution.
2.5V CMOS design with low power consumption.
Supports MII and Reduced MII (RMII) interfaces.
Auto-negotiation for 10/100Mbps and full/half-duplex.
On-chip analog front-end filtering.

KSZ8721B Applications

Ideal for 100BaseTX/10BaseT applications.
Suitable for media converter designs.
Supports back-to-back configurations.
Used in Ethernet networking equipment.

KSZ8721B FAQs

6 frequently asked questions generated from this part’s specifications.

What operating voltage does the KSZ8721B require?

The KSZ8721B operates at 2.5 volts.

What Ethernet standards does the KSZ8721B support?

It supports 10BaseT, 100BaseTX, and 100BaseFX standards.

Does the KSZ8721B support auto-negotiation?

Yes, it supports auto-negotiation for 10/100Mbps speed and full/half-duplex mode.

What interfaces does the KSZ8721B provide?

It supports both Media Independent Interface (MII) and Reduced MII (RMII).

What is the operating temperature range for the KSZ8721B?

The commercial operating temperature range is 0°C to +70°C, and the industrial range is –40°C to +85°C.

What package types are available for the KSZ8721B?

It is available in 48-pin SSOP and 48-pin TQFP packages.

Category	New Products
Manufacturer Name	MIC
Configuration	MII Serial Management, External Control Pins
Interface	MII, RMII
Mounting Type	Surface Mount
Operating Mode	Power Down, Power Saving
Operating Temperature	0°C to +70°C
Operating Voltage	2.5V
Power Consumption	<200mW