Infineon Technologies SFH450V

Overview

SFH450V from Infineon Technologies is a 950 nm infrared plastic-fiber-coupled LED transmitter diode housed in a light-tight molded plastic connector with integrated microlens, rated for 130 mA continuous forward current, 90 µW coupled output power at 10 mA, and operating from –40°C to +85°C - used in optical isolation for household electronics and light barrier sensing.

For engineers reviewing the SFH450V datasheet, SFH450V pinout, SFH450V application, or SFH450V equivalent, key selection criteria include coupled optical power into 1000 µm plastic fiber, thermal coefficient of output power (–0.5 %/K), switching times (1 µs rise/fall), reverse voltage limit (5 V), and compatibility with auto-insertion and wave soldering processes.

Technical Context

The SFH450V is a GaAlAs-based infrared LED optimized for direct coupling into large-core (1000 µm) plastic optical fiber without stripping, leveraging a molded microlens to achieve ≥40 µW coupled output at 10 mA. Its spectral peak at 950 nm (±27.5 nm bandwidth) aligns with high responsivity of Si photodetectors.

Designed for galvanic isolation in low-to-medium-speed digital links, it supports pulse operation up to 3.5 A surge current (10 µs), with thermal resistance of 375 K/W enabling stable performance up to 85°C ambient when mounted with screw-secured housing - critical for power electronics and industrial control interfaces.

Key Specifications

Pinout & Package

Package: Plastic fiber-optic transmitter housing with integrated microlens and mounting screw; TO-style leaded package with two axial leads (anode and cathode), compatible with wave soldering and auto-insertion.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar infrared plastic-fiber-coupled LED transmitter applications.

Compared with TFDU4101 and LTV-814, the SFH450V provides higher coupled optical power into plastic fiber, superior thermal stability of output intensity, and mechanical compatibility with standardized 1000 µm POF - making it uniquely suited for high-reliability, analog-intensity-modulated, or medium-speed digital fiber links where external photodetector selection is flexible.

Availability

SFH450V is available at Aetrix Electronics and suitable for household electronics, power electronics, and light barrier systems requiring stable component supply, long-term manufacturability, and RoHS-compliant infrared emitter solutions.

Supply support for SFH450V 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs and discrete devices.

The SFH450V belongs to Infineon's legacy optoelectronics portfolio designed specifically for robust, low-cost galvanic isolation in consumer and industrial equipment using plastic optical fiber.

FAQ

What is the maximum recommended forward current for continuous operation of the SFH450V?

The absolute maximum continuous forward current is 130 mA at TA = 25°C. Derating is required above 25°C ambient: maximum permissible IF decreases linearly to zero at +85°C, per the "IF = f(TA)" curve in Data Sheet 5. Exceeding this limit risks irreversible junction degradation and reduced optical output lifetime.

Can the SFH450V be directly coupled to glass optical fiber?

No - the SFH450V is mechanically and optically optimized for 1000 µm plastic optical fiber (POF) with a 2.2 mm aperture and molded microlens. Glass fibers (typically 125 µm cladding) cannot be physically secured or efficiently coupled; attempting use results in >90% optical loss and mechanical instability.

Does the SFH450V require external current limiting?

Yes - the device has no internal current regulation. A series resistor must be used to limit forward current to ≤130 mA under worst-case supply voltage and temperature conditions. Typical design uses 10–100 Ω depending on drive voltage (e.g., 5 V supply → ~33 Ω for 100 mA).

Is the SFH450V compliant with modern RoHS and REACH requirements?

Yes - Infineon confirms SFH450V complies with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, including exemption 7a for lead in high-melting-temperature type solders. Full compliance documentation is available under Infineon product change notification PCN-2004-001.