KSZ8091RNACA TR Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
The KSZ8091RNACA TR is a single-port 10BASE-T/100BASE-TX Fast Ethernet physical layer transceiver from Microchip supporting IEEE 802.3az Energy Efficient Ethernet and operating at 3.3 V in a compact 24-pin QFN package. It integrates auto-negotiation, RMII/MII interface, and HP Auto MDI/MDI-X for plug-and-play connectivity. Ideal for IoT gateways, industrial Ethernet nodes, and embedded networking applications requiring low-power LAN connectivity.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 25
- Lifecycle
- ACTIVE
- Datasheet
- KSZ8091RNACA TR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- IEEE 802.3az Energy Efficient Ethernet reduces power consumption during low-activity periods
- 10BASE-T/100BASE-TX dual-speed auto-negotiation for backward-compatible network integration
- RMII and MII interface support enables direct connection to most microcontroller MAC units
- HP Auto MDI/MDI-X eliminates the need for crossover cables in point-to-point links
- 3.3 V single supply operation in a compact 24-pin QFN package for space-constrained designs
- Integrated link status LED drivers simplify front-panel indicator circuit design
Applications
The KSZ8091RNACA TR is used in embedded networking products such as IoT gateways, industrial Ethernet modules, and smart home controllers that connect to 10/100 Mbps networks with minimal external components. Its RMII interface directly pairs with popular MCU and MPU Ethernet MACs, reducing BOM complexity for single-board computer designs. The IEEE 802.3az compliance makes it an energy-efficient choice for network edge devices that spend significant time in low-traffic states.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for KSZ8091RNACA TR:
Frequently Asked Questions
How does the KSZ8091RNACA TR achieve energy savings under IEEE 802.3az?
Under IEEE 802.3az Energy Efficient Ethernet, the KSZ8091RNACA TR can enter a low-power idle state during periods of reduced network traffic, cutting PHY power consumption by up to 50% compared to standard 100BASE-TX operation. The device negotiates LPI (Low Power Idle) with the link partner and resumes full 100 Mbps operation within microseconds when traffic resumes, transparent to the host MAC.
Which MAC interface modes does the KSZ8091RNACA TR support for microcontroller integration?
The KSZ8091RNACA TR supports both RMII (Reduced Media Independent Interface) at 50 MHz reference clock and standard MII at 25 MHz, covering virtually all MCU and MPU Ethernet MAC configurations. This dual-interface flexibility allows engineers to connect it to STM32, NXP i.MX, and similar processors without additional glue logic or clock generation circuitry.
For a new industrial Ethernet node design, when would the KSZ8091RNACA TR be preferred over a larger 48-pin PHY?
The 24-pin QFN footprint of the KSZ8091RNACA TR occupies less than half the board area of typical 48-pin PHY packages, making it the preferred choice when PCB real estate is limited in panel-mount industrial nodes or din-rail modules. Its 3.3 V single-supply operation also simplifies the power tree compared to dual-supply PHYs, reducing design complexity and component count for single-port 100 Mbps applications.
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