| PartNumber | KSZ9021RN | KSZ9021RLI | KSZ9021RL |
| Description | Ethernet ICs GbE Physical Layer Transceiver with RGMII | Ethernet ICs GbE Physical Layer Transceiver with RGMII | Ethernet ICs GbE Physical Layer Transceiver with GMII |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | Ethernet ICs | Ethernet ICs | Ethernet ICs |
| RoHS | Y | Y | Y |
| Series | KSZ9021 | KSZ9021 | KSZ9021 |
| Product | Ethernet Transceivers | Ethernet Transceivers | Ethernet Transceivers |
| Number of Transceivers | 1 Transceiver | 1 Transceiver | 1 Transceiver |
| Operating Supply Voltage | 1.14 V to 3.465 V | 1.14 V to 3.465 V | 1.14 V to 3.465 V |
| Minimum Operating Temperature | 0 C | - 40 C | 0 C |
| Maximum Operating Temperature | + 70 C | + 85 C | + 70 C |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | QFN-48 | LQFP-64 | LQFP-64 |
| Packaging | Tray | Tray | Tray |
| Brand | Microchip Technology / Micrel | Microchip Technology / Micrel | Microchip Technology / Micrel |
| Supply Current Max | 563 mA | - | - |
| Moisture Sensitive | Yes | Yes | Yes |
| Product Type | Ethernet ICs | Ethernet ICs | Ethernet ICs |
| Standard | 10BASE-T, 100BASE-TX, 1000BASE-T | 10BASE-T, 100BASE-TX, 1000BASE-T | 10BASE-T, 100BASE-TX, 1000BASE-T |
| Factory Pack Quantity | 260 | 160 | 160 |
| Subcategory | Communication & Networking ICs | Communication & Networking ICs | Communication & Networking ICs |
| Supply Voltage Max | 1.26 V, 3.465 V, 2.625 V | 3.465 V | 3.465 V |
| Supply Voltage Min | 1.14 V, 3.135 V, 2.375 V | 1.14 V | 1.14 V |
| Unit Weight | 0.005309 oz | 0.012088 oz | 0.012088 oz |
| Data Rate | - | 10 Mb/s, 100 Mb/s, 1000 Mb/s | 10 Mb/s, 100 Mb/s, 1000 Mb/s |
| Interface Type | - | RGMII | GMII |
| Height | - | 1 mm | 1 mm |
| Length | - | 10 mm | 10 mm |
| Width | - | 10 mm | 10 mm |
| Duplex | - | Full Duplex, Half Duplex | Full Duplex, Half Duplex |