KSZ8081RNACA TR Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
KSZ8081RNACA TR is an IEEE 802.3 10BASE-T/100BASE-TX Ethernet PHY transceiver from Microchip operating at 3.3 V with RMII and MII host interface options in a 24-pin QFN package. It supports Auto-MDI/MDIX and auto-negotiation for plug-and-play connectivity. Suitable for industrial Ethernet, embedded networking, and IoT gateway designs requiring compact 100 Mbps physical layer integration.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 25
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- Category
- Integrated Circuit
- Price
- From $0.9141(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- IEEE 802.3 compliant 10BASE-T/100BASE-TX PHY with RMII interface reducing host processor pin count to 10 signals
- Auto-MDI/MDIX and auto-negotiation eliminate straight-through versus crossover cable requirements in field installations
- Single 3.3 V supply operation in compact 24-pin QFN package enabling integration into space-constrained industrial IoT modules
Applications
KSZ8081RNACA TR provides the physical layer for 10/100 Mbps Ethernet connectivity in industrial controllers, PLCs, and embedded gateways where compact board size and single-supply operation are required. Its RMII interface connects directly to ARM Cortex-M and MIPS microcontrollers with integrated Ethernet MACs, reducing external component count and simplifying firmware development. The device is also deployed in home automation hubs, IP cameras, and medical device Ethernet ports where reliable auto-negotiation and MDI/MDIX simplify cable installation.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for KSZ8081RNACA TR:
Frequently Asked Questions
What Ethernet speeds and host interface modes does KSZ8081RNACA TR support?
KSZ8081RNACA TR supports both 10BASE-T at 10 Mbps and 100BASE-TX at 100 Mbps with auto-negotiation to select the highest common speed. The host interface is selectable between RMII (10 signals at 50 MHz reference clock) and MII (18 signals at 25 MHz), allowing compatibility with microcontrollers that expose either MAC interface variant.
How does KSZ8081RNACA TR's Auto-MDI/MDIX feature simplify industrial Ethernet cable management?
Auto-MDI/MDIX automatically detects and corrects the transmit/receive pair orientation, eliminating the need for crossover cables when connecting switch-to-switch or device-to-device. In factory installations with 100 m CAT5e runs, this saves approximately 2 minutes per connection during commissioning and removes the risk of field engineers using the wrong cable type, reducing installation error rates in 24-port control cabinet panels.
For an embedded Linux board with an integrated Ethernet MAC, how many external components does KSZ8081RNACA TR require?
KSZ8081RNACA TR typically requires a 25 MHz crystal or 50 MHz oscillator, a common-mode choke, 4 capacitors for AC coupling, and an RJ-45 jack with integrated magnetics — totaling approximately 8 to 12 passives. The single 3.3 V supply removes the need for additional LDO regulators, keeping the total BOM addition under 15 components for a complete 100 Mbps Ethernet port on a constrained IoT board.
Related Guides
1206 100 uF MLCC Design Guide for Compact Bulk Decoupling
Design guidance for applying CL31A107MQHNNNE and related 1206 MLCCs in compact bulk decoupling networks.
Jul 3, 2026
0402 10 nF MLCC Design Guide for High-Speed Decoupling
Practical design guidance for using CL05B103KB5NNNC and related 0402 MLCCs in high-speed decoupling networks.
Jul 3, 2026
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.0365 | $1.04 |
| 10+ | $0.9141 | $9.14 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”