Renesas 50040R-02

Overview

50040R-02 from Echelon is a RoHS-compliant LONWORKS® free topology link power twisted pair transceiver in a 14-pin SIP package, delivering 5VDC @ 100mA node power, supporting 78 kbps differential Manchester coding, and operating across –40°C to +85°C for building automation and industrial control networks.

For engineers reviewing the 50040R-02 datasheet, 50040R-02 pinout, 50040R-02 application, or 50040R-02 equivalent, key selection criteria include TP/FT-10 channel compliance, polarity-insensitive network wiring, integrated 5V power extraction, and compatibility with Neuron Chip CP0/CP1 interfaces.

Technical Context

The 50040R-02 implements a differential Manchester-coded physical layer transceiver synchronized to Neuron Chip–supplied clock inputs (3.25 MHz to 20 MHz), with automatic clock configuration and built-in high-impedance power-down protection. It extracts regulated +5VDC from a 42.4VDC network supply delivered via LPI-10 interface.

Its architecture supports star, bus, and loop topologies without stub-length constraints, and provides electrical noise isolation via galvanic separation between network and node domains. Compliance includes EN 61000-4-x immunity standards (Levels 3–4) and FCC/CISPR Level B EMI limits.

Key Specifications

Pinout & Package

Package: 14-pin Single In-line Package (SIP), through-hole mounting, 1.8 mm pin pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LONWORKS twisted-pair transceiver applications.

Compared with FTT-10A and FT 3150, the 50040R-02 uniquely combines TP/FT-10 compliance, polarity-insensitive wiring, and 100mA integrated 5V power - making it the only option for new installations requiring centralized link-powered node architecture without local regulation.

Availability

50040R-02 is available at Aetrix Electronics and suitable for building automation, industrial lighting control, energy submetering, and fire alarm interconnect applications requiring stable component supply and RoHS-compliant sourcing.

Supply support for 50040R-02 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Echelon Corporation was a pioneer in control networking, developing the LONWORKS platform and Neuron Chip architecture for interoperable, scalable building and industrial automation systems.

The 50040R-02 belongs to Echelon's LPT-11 Link Power Transceiver product line, designed specifically to enable single-cable (data + power) deployment of LONWORKS nodes in free-topology networks without local power supplies.

FAQ

What is the primary function of the 50040R-02 in a LONWORKS network?

The 50040R-02 serves as a free topology twisted pair transceiver that simultaneously receives network data and extracts 5VDC power from a 42.4VDC link-powered bus. It interfaces directly with the Neuron Chip's CP0 and CP1 pins, implements differential Manchester coding at 78 kbps, and supports star, bus, and loop topologies without stub restrictions - enabling simplified, cost-effective LONWORKS node deployment.

Does the 50040R-02 require an external power supply at the node?

No, the 50040R-02 does not require an external power supply at the node. It derives all operating power from the 42.4VDC network supplied by the LPI-10 Link Power Interface Module via the NET_A/NET_B twisted pair. Its internal switching regulator delivers up to 100mA at 5VDC on the VCC pin, sufficient to power a Neuron Chip and associated peripherals such as sensors and actuators.

Is the 50040R-02 compatible with FTT-10A and FT3120/FT3150 devices?

Yes, the 50040R-02 is explicitly stated as compatible with the FTT-10A Free Topology Transceiver and FT3120/FT3150 Smart Transceivers. It meets the LONMARK® TP/FT-10 channel type requirements and uses identical differential Manchester coding and timing - ensuring interoperability across mixed-node LONWORKS networks without protocol translation or gateway hardware.

What are the maximum network length limitations for the 50040R-02 in free topology mode?

In free topology mode, the 50040R-02 supports up to 500 meters of total wire length without repeaters, and up to 1000 meters with one repeater. The maximum node-to-node distance is 500 meters. These limits assume use of Level-4 cable (e.g., ANSI/TIA/EIA-568-A Category 5) and are defined in the LPT-11 User's Guide - exceeding them may degrade signal integrity or violate TP/FT-10 channel compliance.

How does the 50040R-02 handle network polarity during installation?

The 50040R-02 features polarity-insensitive network wiring: NET_A and NET_B terminals are functionally interchangeable, eliminating the need to observe A/B orientation during installation. This design prevents miswiring errors in field deployments and simplifies commissioning - especially valuable in large-scale building automation projects where cable pairs may be crossed or reversed during pull.