Renesas 51001R

Overview

51001R from Echelon Corporation is a two-piece magnetic shield engineered to reduce FTT-10A transceiver susceptibility to horizontal stray magnetic fields in the 10 kHz–300 kHz band. It comprises an inner stress-annealed Co-Netic alloy shield and outer stress-annealed Netic alloy shield, RoHS-compliant, with precise external dimensions (inner: 18.9 × 14.6 × 7.0 mm; outer: 20.8 × 16.8 × 8.0 mm).

For engineers reviewing the 51001R datasheet, 51001R installation guidelines, 51001R mechanical fit for FTT-10A, or 51001R material compatibility with PCB clearance requirements, this page delivers verified dimensional, material, and application-specific facts required for noise mitigation integration in LONWORKS® twisted-pair networks.

Technical Context

The 51001R addresses magnetic interference specifically in the FTT-10A's most sensitive axis - horizontal fields parallel to the PCB plane - where coupling degrades signal integrity in 78.4 kbps free-topology LONWORKS® networks. Its nested dual-alloy construction leverages differential magnetic permeability: Co-Netic (inner) provides high initial permeability for low-field attenuation, while Netic (outer) offers superior saturation resistance for strong ambient fields.

Installation mandates 0.5–1.0 mm PCB clearance to prevent electrostatic discharge paths, and non-conductive adhesive (e.g., RTV) secures the inner shield to the FTT-10A plastic housing. The shield does not electrically interface with the transceiver; it functions purely as a passive magnetic flux shunt.

Key Specifications

Availability

51001R is available at Aetrix Electronics and suitable for LONWORKS® building automation, industrial control networks, smart metering infrastructure, and legacy free-topology twisted-pair systems requiring stable component supply and long-term obsolescence management.

Supply support for 51001R 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 technology for interoperable, distributed automation systems.

The 51001R belongs to Echelon's FTT-10A ecosystem support components, designed explicitly to extend reliable operation of free-topology twisted-pair transceivers in electromagnetically noisy industrial and utility environments.

FAQ

Does the 51001R require electrical connection to the FTT-10A or PCB?

No. The 51001R is a passive magnetic shield with no electrical terminals or connections. It must be physically mounted over the FTT-10A using non-conductive adhesive (e.g., RTV), and maintained at 0.5–1.0 mm clearance from the PCB to avoid electrostatic discharge paths. The 51001R functions solely by redirecting magnetic flux - not by grounding or filtering signals.

What magnetic field orientation does the 51001R primarily mitigate?

The 51001R is specifically engineered to attenuate horizontal stray magnetic fields - those parallel to the PCB surface - which are the dominant interference vector for the FTT-10A transceiver. Vertical fields (perpendicular to the PCB) have negligible impact on FTT-10A performance, so the 51001R's geometry and material stack prioritize shielding in the horizontal plane.

Can the 51001R be used with transceivers other than the FTT-10A?

No. The 51001R's inner dimensions (18.9 × 14.6 × 7.0 mm), nested mounting method, and magnetic attenuation profile are validated exclusively for the FTT-10A. Its design assumes the FTT-10A's physical footprint, coil orientation, and sensitivity axis. Using the 51001R with other transceivers is not supported and may yield ineffective or unpredictable shielding performance.

Is the 51001R RoHS-compliant?

Yes. The 51001R complies with European Directive 2002/95/EC (RoHS), restricting hazardous substances including lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. This compliance applies to both the Co-Netic inner shield and the painted Netic outer shield, confirming suitability for sale and use in EU-regulated markets.

How is the 51001R installed relative to the FTT-10A module?

The 51001R uses a two-stage nested installation: first, the inner shield is affixed directly over the FTT-10A's plastic housing using a small amount of non-conductive RTV adhesive; second, the outer shield is mounted concentrically over the inner shield. Neither shield contacts the PCB - a strict 0.5–1.0 mm air gap must be maintained beneath the inner shield's base to prevent ESD conduction paths.