LAN8742-CZ - 100Mbps Ethernet PHY with 24-QFN
部品番号: LAN8742-CZ ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LAN8742-CZ 概要
An Ethernet PHY is the physical-layer device that translates digital MAC data into electrical signaling for a network cable and converts received cable signals back into digital data. In the hierarchy, the LAN8742-CZ belongs to the Ethernet transceiver, network-interface, integrated-interface-IC, and broader semiconductor categories. Placing a PHY between a host controller and an RJ45 magnetics assembly allows a microcontroller, application processor, or dedicated Ethernet controller to connect to 10 Mbps or 100 Mbps copper networks without implementing the analog cable interface directly.
Verified features include 10BASE-T and 100BASE-TX operation, auto-negotiation, HP Auto-MDIX, Energy Efficient Ethernet support identified in the family description, and Wake-On-LAN functionality identified for the LAN8742 family. The variable I/O voltage allows the digital interface voltage to be selected for integration with a host, while the compact 24-QFN, 4 x 4 mm package supports space-constrained embedded designs. The verified results also describe cable diagnostics support, although detailed diagnostic limits are not supplied.
The LAN8742-CZ is normally used as the PHY beside a 10/100 Ethernet magnetic module and RJ45 connector. RMII connects the PHY to the MAC, reducing the number of parallel data and control signals compared with older MII implementations. The PHY supports 10 Mbps and 100 Mbps operation and automatically negotiates the best supported speed and duplex mode, simplifying host-side configuration. Exact timing, current, voltage-range, temperature, and package-dimension details require the manufacturer datasheet and are not inferred here.
For new production designs, verify lifecycle status and sourcing before committing to an obsolete device. The verified cross-reference data specifically identifies LAN8742A-CZ-TR as a compatible substitute with extended availability, while also describing LAN8742AI-CZ-TR as a direct pin-compatible replacement. Any substitution should be checked against the exact RMII pin mapping, voltage domains, package exposed-pad requirements, magnetic-device pinout, and system timing.
This page combines verified distributor and manufacturer information with application guidance, replacement context, and package-focused design notes. It does not invent unpublished pricing, electrical limits, pin names, or lifecycle dates; unavailable values are explicitly marked for engineering review.
ドロップイン代替品: LAN8742-CZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LAN8742-CZ （同一形状・フットプリント） — 相違点: Auto-Negotiation, Cable Diagnostics, Package, Auto-MDIX, Host Interface.
クイック比較ツール — 並列比較する代替部品を選択:
LAN8742A-CZ-TR
✅ ドロップイン✓ 在庫あり
$0.7383 / 個
データシートを見る →LAN8742AI-CZ-TR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LAN8740AI-EN-TR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LAN8720AI-CP-TR-ABC
✅ ドロップイン📋 参考代替品（カタログ未掲載）
KSZ8001LI
✅ ドロップイン✓ 在庫あり
$4.3 / 個
データシートを見る →LAN8742-CZ 仕様
| Product Type | 10/100 Fast Ethernet PHY transceiver |
| Maximum Data Rate | 100 Mbps |
| Supported Standards | IEEE 802.3 and IEEE 802.3u |
| Copper Modes | 10BASE-T and 100BASE-TX |
| Host Interface | RMII |
| Driver/Receiver Configuration | 1/1 |
| I/O Voltage | 1.2 V and 3.3 V |
| パッケージ | 24-pin QFN, 4 x 4 mm |
| Auto-Negotiation | Supported |
| Auto-MDIX | HP Auto-MDIX supported |
| Cable Diagnostics | Supported |
| Energy Efficient Ethernet | IEEE 802.3az family support identified |
| Wake-On-LAN | Supported for the LAN8742 family |
| Operating Speed Modes | 10 Mbps and 100 Mbps |
| Duplex Operation | Full-duplex RMII support identified |
| 実装タイプ | Surface mount |
LAN8742-CZ 24-pin qfn, 4 x 4 mm ピン配置ガイド
LAN8742-CZ (24-pin qfn, 4 x 4 mm パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: LAN8742-CZ.
詳細は データシート をご参照ください。
主な用途
LAN8742-CZ の用途: 6 件s: Embedded MCU Ethernet Connectivity, Industrial Network Gateway, IoT Sensor and Controller, Network-Enabled Test Instrument, USB-to-Ethernet Adapter, Power-Sequenced Network Appliance.
Embedded MCU Ethernet Connectivity
The LAN8742-CZ fits an embedded design that needs a 10/100 copper-Ethernet port from a microcontroller or application processor. Its verified 10BASE-T and 100BASE-TX support, auto-negotiation, variable 1.2 V or 3.3 V I/O support, and RMII host interface allow the PHY to sit between the digital MAC and network magnetics. In a typical design, the host connects through RMII, while the PHY drives and receives the analog-side signals toward an Ethernet transformer. The principal design checks are exact RMII timing, voltage domains, reset/startup behavior, exposed-pad layout, and magnetic-device compatibility. Because the verified snippets do not provide complete timing or current limits, use the manufacturer datasheet before finalizing clocking, decoupling, and power budgets.
おすすめ
Industrial Network Gateway
The LAN8742-CZ can provide a compact 10/100 Ethernet interface in an industrial gateway when the required operating-temperature and reliability conditions are confirmed from the exact datasheet. Its low-power PHY architecture, auto-negotiation, HP Auto-MDIX, and cable-diagnostics features are useful for links that may use variable cable pairs or varying network conditions. The PHY is normally paired with industrial-grade Ethernet magnetics and an RJ45 connector, while the host manages configuration and application traffic through RMII. Designers should account for surge protection, grounding, isolation requirements, cable insertion, startup sequencing, and thermal rise around the 24-QFN package. The verified data does not state the LAN8742-CZ temperature range, so an industrial design must not assume qualification from the generic family description.
おすすめ
IoT Sensor and Controller
The LAN8742-CZ is appropriate for an IoT controller that needs wired Ethernet backup or primary connectivity while accepting its 100 Mbps maximum rate. Its auto-negotiation capability removes the need for fixed-speed configuration in many deployments, while HP Auto-MDIX can simplify physical-network installation. A practical design routes the RMII signals from the host controller to the PHY, then routes the transformer-side signals through controlled impedance and short return paths to the magnetics and RJ45 connector. Keep the cable-side network interface isolated according to the product's isolation and surge requirements. Wake-On-LAN and Energy Efficient Ethernet family functions may help reduce power consumption in suitable systems, but the supplied data does not quantify wake latency or power savings, so firmware and hardware validation should include those behaviors.
おすすめ
Network-Enabled Test Instrument
For a test instrument or measurement controller, the LAN8742-CZ can supply a wired 10/100 Ethernet management connection beside a host processor. The verified RMII interface and variable I/O voltage are useful when the controller already provides a compatible MAC interface, while the compact 24-QFN, 4 x 4 mm package helps preserve board area. The analog network section still requires correctly selected magnetics, controlled routing, adequate return paths, and protection appropriate to the enclosure and cable environment. Firmware should use the supported 10 Mbps and 100 Mbps modes, verify link negotiation, and handle loss of link or cable diagnostics. Exact RMII timing, reset requirements, and electrical limits should be taken from the manufacturer datasheet rather than inferred from the distributor snippets.
おすすめ
USB-to-Ethernet Adapter
The LAN8742-CZ can be used in a USB-to-Ethernet adapter architecture when a USB controller or bridge provides the appropriate data path to the PHY. Its 10/100 support is sufficient for legacy Fast Ethernet infrastructure, and auto-negotiation allows the adapter to operate at either 10 Mbps or 100 Mbps depending on the link partner. The 24-QFN package supports compact adapter designs, but the board still needs magnetics, RJ45, Ethernet-side protection, and a clean separation between digital and analog routing. Verify whether the chosen USB bridge supports the exact RMII timing and voltage level required by the LAN8742-CZ. The supplied data identifies LAN8742-CZ as a 1/1 driver/receiver RMII device; it does not provide complete USB compatibility data, so USB bridge selection must be validated independently.
おすすめ
Power-Sequenced Network Appliance
The LAN8742-CZ can serve a network appliance whose Ethernet port must initialize predictably after the host and power rails become stable. The PHY's auto-negotiation, variable I/O voltage, and low-power operating concept can support an orderly RMII connection in a compact embedded board. A robust design should define reset timing, clock source, supply ramp sequencing, and the relationship between the MAC and PHY before enabling network traffic. The Ethernet magnetics and RJ45 connector should be placed to minimize the analog-side loop area, with ESD and surge protection placed according to the enclosure and cable requirements. Since the verified material does not state startup delays, operating temperature, or power consumption, these values must be validated from the exact manufacturer documentation and measured on the final board.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LAN8742-CZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LAN8742A-CZ-TR | LAN8742AI-CZ-TR | LAN8740AI-EN-TR | LAN8720AI-CP-TR-ABC | KSZ8001LI |
|---|---|---|---|---|---|---|
| Package | 24-QFN, 4 x 4 mm | 24-QFN, 4 x 4 mm | 24-QFN, 4 x 4 mm | 24-QFN, 4 x 4 mm | 24-QFN, 4 x 4 mm | 24-QFN, 4 x 4 mm |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
主な差別化要因
- Obsolete target versus extended-availability family replacement （vs LAN8742A-CZ-TR)
- Direct replacement description （vs LAN8742AI-CZ-TR)
- Compact Ethernet integration （vs KSZ8001LI)
設計ノート
Use the manufacturer 24-QFN land pattern and verify the exposed-pad connection before fabrication. Place the PHY close to the Ethernet magnetics and RJ45 connector, keep the cable-side routing compact, and provide a continuous ground reference. The verified Microchip QFN placement checklist specifically recommends arranging the magnetics and RJ45 routing to create the best routing scheme from the LAN8742 QFN to the connector.
Separate the RMII digital interface from the transformer-side Ethernet signals as much as the board area allows. Match the host clock and RMII timing to the exact datasheet requirements, avoid routing the interface over noisy power or switching regions, and use the specified decoupling network. Because the supplied snippets do not provide complete timing or capacitance values, do not substitute generic Ethernet capacitors or assume a compatible RMII clock without checking the manufacturer data.
Do not treat LAN8742A-CZ-TR or LAN8742AI-CZ-TR as automatically interchangeable merely because they are related family names. Confirm the exact RMII pin mapping, voltage domains, package exposed pad, reset/startup sequence, magnetic interface, and cable-diagnostics behavior. Also verify the 1/1 driver-receiver configuration and the required magnetics connection against the selected part's datasheet before releasing a replacement PCB or production substitution.
コンプライアンス情報
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for LAN8742-CZ. Obtain current manufacturer compliance documentation for the exact MPN before regulated production.
