FR50MVIR 650 nm DC-50 MBd 50 m RedLink® POF Vertical Receiver

Set the link budget so that the peak optical-high power reaching the receiver remains between −22 and +2 dBm, while the optical-low state is no higher than −40 dBm. The receiver is characterised with transmitters emitting between 635 and 680 nm, so a 650 nm source lies within the characterised band; the broader 400 to 900 nm sensitivity range does not imply identical performance at every wavelength. The optical limits refer to peak rather than average power, and peak power is twice the average for 50% duty-cycle data. The calculation should include fibre attenuation, connectors, temperature, transmitter tolerance, contamination and ageing. For a proposed 50 m POF or 300 m PCS link, verify both the minimum received high level and maximum permitted input power under worst-case conditions.

The receiver can operate from either a 3.3 V or 5 V DC supply, with a permitted rail variation of ±10%. Its supply current is typically 20 mA and may reach 25 mA, so the regulator and power-distribution network should be sized for the maximum value. A 100 nF capacitor should be fitted close to the V_CC pin of every receiver. The recommended supply filter uses two 10 µF capacitors and a 1 µH inductor to reduce noise coupled from other components on the same rail. Where several receivers are positioned close together, the larger filter network may be shared, but each device still requires its own local 100 nF decoupling capacitor.

The FR50MVIR produces an electrical logic state that is inverted relative to the detected optical input. When light is present, the normal operating output is therefore low; when light is absent and the input is below the optical-low threshold, the output is high. During startup, the output remains in a high-impedance state as the supply approaches approximately 2.8 V. The listed wake-up delay is 40 µs, after which the output changes to the correct logic state for the optical input. If the supply falls below approximately 2.6 V, the output immediately returns to high impedance, which should be considered when designing reset, pull-state and fault-detection logic.

At 50 MBd, the minimum unit interval is 20 ns and the maximum alternating-pattern frequency is 25 MHz. Output rise and fall times are each specified at no more than 5 ns, while high-to-low and low-to-high propagation delays are each limited to 50 ns. Pulse-width distortion is limited to ±4 ns when the optical-high level is between −20 and +2 dBm, increasing to ±6 ns near the lower sensitivity region from −22 to −20 dBm. The first three pulses can exhibit a wider range from −7 to +14 ns, with the first pulse representing the least favourable case. Protocol timing, sampling points and receiver-to-controller skew should therefore be checked against both steady-state and initial-pulse limits.

The optical interface accepts plastic optical fibre and 200 µm plastic-clad silica fibre. Step-index POF links can extend to 50 metres, while links using 200 µm PCS fibre can reach 300 metres, although both figures depend on installation conditions. The receiver can be used in optical physical layers carrying RS232, RS485, CAN bus, Modbus or PROFIBUS communications where the signal rate remains within the DC to 50 MBd range. It performs optical-to-electrical conversion and does not itself implement protocol framing, bus arbitration or line coding. The chosen transmitter, fibre, connector losses and interface circuitry must therefore be validated as a complete link rather than treating the receiver as a protocol converter.

The receiver is not suitable for infrared or vapour-phase reflow soldering. Its one-time soldering limit is +260 °C for 10 seconds, measured at least 2.2 mm from the lead root, and non-halogenated water-soluble flux is recommended. The dust plug should remain fitted throughout soldering, washing and drying to protect the active optical area. Alcohol-based cleaning agents such as methyl, isopropyl or isobutyl alcohol may be used, while acetone, ethyl acetate and phenol-based products are not permitted. The device is classified as MSL 2a and may remain under normal factory conditions below 30 °C and 60% relative humidity for up to 672 hours after opening. An unopened moisture-barrier bag has a stated shelf life of 24 months below 40 °C and 90% relative humidity.

The receiver is rated to operate and be stored from −40 °C to +85 °C, allowing the same temperature limits to be applied during equipment qualification. Contact electrostatic discharge is rated to Human Body Model Level 2 at 4 kV under MIL-STD-883. Radiated immunity is specified at 15 V m⁻¹ under IEC 61000-4-3, which provides a defined reference point for electromagnetic compatibility planning. The device carries UL 60950-1 certification under file E362227 and is compliant with the stated RoHS directive and amendment. Its housing material is rated UL 94 V-0, while storage and assembly controls are defined by the MSL 2a classification. These component-level ratings should be considered alongside the enclosure, PCB, cabling and system-level compliance requirements.