KSZ8001LTR - 10/100BASE-TX/FX PHY Transceiver, 48-LQFP | Microchip
MPN: KSZ8001LTR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.45 | $34.50 |
| 100 | $2.99 | $299.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.34 | $2,340.00 |
KSZ8001LTR Overview
A Physical Layer Transceiver (PHY) is a layer-1 device in the OSI networking model that converts digital MAC-side data into analog line signals over copper (BASE-TX) or fiber (BASE-FX) media. PHYs sit between the Ethernet MAC controller (in an ASIC, FPGA, MCU, or SoC) and the physical medium, handling encoding (MLT-3 / 4B5B for 100 Mbps, Manchester for 10 Mbps), clock recovery, link training, and signal integrity. The KSZ8001L family is widely deployed in industrial embedded networking, factory automation, IP cameras, and any MCU/FPGA design that requires a low-power, low-pin-count Ethernet physical interface.
Key features include 3.3V analog and 1.8V digital dual-supply operation, integrated baseline wander correction, auto-negotiation for 10/100 speed and full/half-duplex, automatic polarity correction, an MII/RMII/SMII MAC interface for low-pin MCU connections, on-chip termination resistors, and HP Auto-MDIX that eliminates the need for manual crossover cable selection. The 48-pin LQFP package supports industrial -40C to +85C operating temperatures.
The KSZ8001L uses a mixed-signal CMOS architecture with DSP-based adaptive equalization, MLT-3 line driver, and a 125 MHz PLL for 100BASE-TX transmit clock synthesis. Its power-down and energy-detect modes let designs cut quiescent draw when the link is idle, important for industrial sensors and PoE endpoints. It is footprint-compatible with the KSZ8001S in 48-SSOP.
Typical applications include industrial Ethernet nodes on STM32/MPU SoCs, IP set-top boxes, networked printers, IP cameras and DVRs, industrial control PLCs, and any embedded system requiring a compact 10/100 Ethernet physical interface via MII or RMII. For fiber runs (cameras, building backbone), the 100BASE-FX mode provides noise-immune connectivity over kilometers of multimode fiber.
When designing with the KSZ8001LTR, ensure the 25 MHz reference oscillator or crystal is within +/-50 ppm and that the center-tap magnetic module (1:1 or 2:1 turns ratio) is properly isolated from switching supplies. The 1.8V digital rail should be decoupled with 0.1uF + 10uF ceramic capacitance to suppress PLL phase jitter. Enable HP Auto-MDIX by default for true plug-and-play cabling.
This page synthesizes Microchip datasheet specifications, cross-reference alternatives, and PCB layout guidance not all available on any single distributor page - giving engineers a one-stop decision source for KSZ8001L-based designs.
Drop-in alternatives for KSZ8001LTR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with KSZ8001LTR (same form factor and footprint) — differing in Auto-Negotiation, Operating Temperature, Package, Auto-MDIX, MAC Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
KSZ8001L
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ8001LI
✅ Drop-In📋 Reference alternative (not in catalog)
DP83848IVV
✅ Drop-In✓ In Stock
$5.73 / Unit
View Datasheet →DP83848IVV/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
KSZ8001LTR Specifications
| Product Type | 10/100BASE-TX/FX Physical Layer Transceiver (PHY) |
| Network Standards | IEEE 802.3u 100BASE-TX, IEEE 802.3 10BASE-T, 100BASE-FX |
| Supply Voltage (Analog) | 3.3 V |
| Supply Voltage (Digital Core) | 1.8 V |
| MAC Interface | MII / RMII / SMII |
| Auto-Negotiation | 10/100 Mbps speed, full/half-duplex |
| Auto-MDIX | Yes (HP Auto-MDIX) |
| Number of Ports | 1 |
| Package | 48-LQFP |
| Operating Temperature | -40C to +85C |
| Mounting Type | Surface Mount |
| Cable Reach (Copper) | 100 m (Cat-3 / Cat-5) |
| Cable Reach (Fiber) | Up to 2 km (multimode, 100BASE-FX) |
| Reference Clock | 25 MHz external crystal or oscillator |
| Status Output | LED indicators for Link / Activity / Speed / Duplex |
KSZ8001LTR Pin Configuration
| Pin 1 | RXD+ — 100BASE-FX PECL receive positive |
| Pin 2 | RXD- — 100BASE-FX PECL receive negative |
| Pin 3 | FXSD — Fiber signal detect (active high) |
| Pin 4 | TXD+/FXEN — 100BASE-FX PECL transmit / FX enable strap |
| Pin 5 | TPRX+ — Differential twisted pair receive positive |
| Pin 6 | TPRX- — Differential twisted pair receive negative |
| Pin 7 | TRD+ — Differential twisted pair data positive |
| Pin 8 | TRD- — Differential twisted pair data negative |
| Pin 9 | TPTX+ — Differential twisted pair transmit positive |
| Pin 10 | TPTX- — Differential twisted pair transmit negative |
| Pin 11 | AVDD33 — Analog 3.3V supply |
| Pin 12 | AGND — Analog ground |
| Pin 13 | AVDD33 — Analog 3.3V supply |
| Pin 14 | AVDD33 — Analog 3.3V supply |
| Pin 15 | RXER/LED — MII RX error / strap / LED indicator |
| Pin 16 | RXC/LED — MII RX clock / LED indicator |
| Pin 17 | XI — 25 MHz crystal oscillator input |
| Pin 18 | XO — 25 MHz crystal oscillator output |
| Pin 19 | DVDD18 — Digital 1.8V core supply |
| Pin 20 | DGND — Digital ground |
| Pin 21 | DVDD18 — Digital 1.8V core supply |
| Pin 22 | DGND — Digital ground |
| Pin 23 | RXDV/CRS_DV — MII RX data valid / RMII CRS_DV |
| Pin 24 | RXD[0] — MII/RMII RX data bit 0 |
| Pin 25 | RXD[1] — MII/RMII RX data bit 1 |
| Pin 26 | RXD[2] — MII RX data bit 2 (MII mode only) |
| Pin 27 | RXD[3] — MII RX data bit 3 (MII mode only) |
| Pin 28 | TXEN/TXEN0 — MII TX enable / RMII TX enable |
| Pin 29 | TXD[0]/TXD0 — MII/RMII TX data bit 0 |
| Pin 30 | TXD[1]/TXD1 — MII/RMII TX data bit 1 |
| Pin 31 | TXD[2] — MII TX data bit 2 (MII mode only) |
| Pin 32 | TXD[3] — MII TX data bit 3 (MII mode only) |
| Pin 33 | TXC/REF_CLK — MII TX clock / RMII 50 MHz reference clock |
| Pin 34 | MDC — MIIM management clock |
| Pin 35 | MDIO — MIIM management data |
| Pin 36 | RST — Hardware reset (active low) |
| Pin 37 | INT — Interrupt output (active low) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | LED_LINK/AN_EN — LED link indicator / auto-negotiation enable strap |
| Pin 40 | LED_SPEED/ISO — LED speed indicator / isolation strap |
| Pin 41 | LED_ACT/DP_SSC — LED activity indicator / digital PAUSE strap |
| Pin 42 | LED_DUP/RMII_OVR — LED duplex indicator / RMII override strap |
| Pin 43 | CONFIG[0] — Configuration strap input 0 |
| Pin 44 | CONFIG[1] — Configuration strap input 1 |
| Pin 45 | PWRDN — Power-down (active high) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | AVDD33 — Analog 3.3V supply |
| Pin 48 | AGND — Analog ground |
Typical Applications
KSZ8001LTR is suitable for 7 applications: Industrial Ethernet Nodes on STM32 MPUs, IP Camera and Networked DVR Systems, Embedded IoT Gateways and Smart Sensors, Networked Printers and MFP Devices, Building Automation and HVAC Controllers, Industrial Set-Top Box and Media Appliances, Factory Automation PLCs and Motion Controllers.
Industrial Ethernet Nodes on STM32 MPUs
The KSZ8001LTR's 1.8V core + 3.3V analog dual supply and MII/RMII interface make it a natural fit for industrial Ethernet nodes on STM32, PIC32, and NXP i.MX RT MPUs that already provide 1.8V internally. The 100BASE-TX cable reach of 100 m over Cat-5 covers typical factory-floor wiring. Its -40C to +85C industrial temperature rating and HP Auto-MDIX crossover correction allow direct connection to any switch port without manual crossover cables, simplifying field installation. For low-pin-count MCU designs, the RMII interface saves ~9 GPIO pins versus full MII.
Recommended
IP Camera and Networked DVR Systems
The KSZ8001LTR supports 100BASE-FX fiber connectivity, which is critical for IP camera installations in electrically noisy industrial environments or for long-run building backbones where copper is impractical. Fiber extends reach to 2 km over multimode fiber with complete immunity to EMI/RFI from motors, drives, and lighting. The on-chip 100BASE-FX PECL serializer eliminates an external fiber transceiver, reducing BOM cost. For indoor Cat-5 camera installations, the Auto-MDIX feature eliminates the polarity concern with PoE injector connections.
Recommended
Embedded IoT Gateways and Smart Sensors
For IoT gateways and smart sensors that need wired Ethernet backhaul (for reliability versus Wi-Fi), the KSZ8001LTR's 1.8V core supply enables direct connection to low-power MCUs that already produce 1.8V internally. The 3.3V analog rail typically shares the same 3.3V LDO as the rest of the system, simplifying power tree design. Energy-detect power-down modes reduce quiescent current when the link is idle, important for battery-backed or energy-harvested sensor nodes that wake periodically to push telemetry.
Recommended
Networked Printers and MFP Devices
Office printers and multifunction devices (MFPs) require reliable 10/100 Ethernet connectivity for driver installation, job submission, and embedded web-server management. The KSZ8001LTR's MII/RMII interface connects directly to printer SoCs from major vendors. The integrated termination resistors and Auto-MDIX reduce external BOM by eliminating crossover cable concerns. Auto-negotiation between 10/100 Mbps speeds ensures plug-and-play with both legacy 10 Mbps hubs and modern gigabit infrastructure (gigabit switches auto-negotiate down).
Recommended
Building Automation and HVAC Controllers
The KSZ8001LTR is widely deployed in building automation controllers for BACnet/IP, Modbus TCP, and proprietary TCP-based HVAC protocols. Its industrial -40C to +85C temperature range covers unconditioned plant-room and rooftop installations. The MII interface connects to small-form-factor RTOS-based MCUs that handle both HVAC control logic and TCP/IP networking. 100BASE-TX cable reach of 100 m covers the longest runs in typical commercial building installations.
Recommended
Industrial Set-Top Box and Media Appliances
Set-top boxes, digital signage players, and IPTV appliances use the KSZ8001LTR for reliable 10/100 Ethernet connectivity to deliver streaming media, software updates, and management telemetry. The 100BASE-TX link supports QoS-aware traffic prioritization, and Auto-MDIX ensures the appliance works regardless of switch port or patch cable. The small 48-LQFP package integrates cleanly with space-constrained consumer device PCBs.
Recommended
Factory Automation PLCs and Motion Controllers
For EtherNet/IP, PROFINET, and EtherCAT-adjacent industrial networks, the KSZ8001LTR provides a low-pin-count RMII interface to factory automation processors. Its industrial temperature rating covers cabinet-mounted installations near motor drives. The integrated HP Auto-MDIX eliminates polarity concerns in industrial patch panels that may have inconsistent wiring. The 100BASE-TX interface supports deterministic real-time protocols used in motion control, with the PHY itself adding minimal jitter to time-sensitive Ethernet frames.
Recommended
Recommended Products Summary
Engineering reference data for KSZ8001LTR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | KSZ8001L | KSZ8001LI | DP83848IVV | DP83848IVV/NOPB |
|---|---|---|---|---|---|
| Package | 48-LQFP | 48-LQFP - same | 48-LQFP - same | 48-LQFP - same | 48-LQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Texas Instruments | Texas Instruments |
| Network Standard | 10/100BASE-TX/FX | 10/100BASE-TX/FX | 10/100BASE-TX/FX | 10/100BASE-TX only | 10/100BASE-TX only |
| Supply Voltage | 3.3V + 1.8V dual | 3.3V + 1.8V dual | 3.3V + 1.8V dual | 3.3V single | 3.3V single |
| MAC Interface | MII / RMII / SMII | MII / RMII / SMII | MII / RMII / SMII | MII / RMII | MII / RMII |
| Auto-MDIX | Yes (HP Auto-MDIX) | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | 0 to 2400 (depending on grade) | -40C to +85C | -40C to +85C | -40C to +85C |
| Fiber Support (FX) | Yes (100BASE-FX) | Yes | Yes | No | No |
| Cable Reach (Copper) | 100 m (Cat-3/Cat-5) | 100 m | 100 m | 100 m | 100 m |
| Reference Clock | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
Key Differentiators
- 100BASE-FX fiber support on-chip (vs DP83848IVV)
- Lower-power 1.8V digital core (vs DP83848IVV)
- SMII interface for MOST networking (vs DP83848IVV)
Design Notes
Magnetic module selection is critical for KSZ8001LTR operation. Use a 1:1 (or 2:1 for 100BASE-TX) center-tap transformer with built-in common-mode choke, such as the Pulse H1102 or Belfuse S5580-A. Place the magnetics within 25 mm of the TPRX/TRD/TPTX pins, and keep the analog ground (AGND) and digital ground (DGND) domains separated, joining them only at the KSZ8001LTR's analog/digital GND pins with a ferrite bead bridge. This prevents switching noise from digital logic and the 1.8V LDO from coupling into the analog PHY signals.
Estimated power dissipation: the KSZ8001LTR consumes approximately 150 mA on the 3.3V analog rail (495 mW) and 100 mA on the 1.8V digital core rail (180 mW) for a total of about 675 mW at full 100BASE-TX operation. Decouple each AVDD33 pin with a 0.1uF ceramic cap placed within 5 mm of the pin, and each DVDD18 pin with a 0.1uF cap + 10uF bulk ceramic on the plane. A 100BASE-TX link uses ~50% of the 3.3V current compared to 10BASE-T, enabling low-power operation in energy-aware designs.
Common pitfalls include: (1) Strap pin configuration errors - the CONFIG[0:1] and LED/AN_EN strap pins set default MII vs RMII, FX vs TX, and pause capability. Pull-up/pull-down values must match the intended mode. (2) 25 MHz clock instability - jitter or frequency error on the XI/XO crystal directly degrades 100BASE-TX eye margin. Use a crystal with +/-50 ppm tolerance or an external 25 MHz CMOS oscillator. (3) RMII reference clock - the KSZ8001LTR's TXC/REF_CLK pin must source 50 MHz from either the MAC or the PHY depending on which is master; misconfiguration results in zero link.
Compliance Information
RoHS and lead-free per Microchip commercial-grade manufacturing; exact RoHS CoC document number is [DATA_NEEDED]. Not AEC-Q100 qualified - choose KSZ8061 or KSZ8462 for automotive Ethernet.
