Infineon Technologies SFH756V

Overview

SFH756V from Infineon Technologies is a plastic-fiber-optic transmitter diode with integrated microlens, designed for 660 nm visible-light coupling into 1000 µm POF (plastic optical fiber). It delivers ≥100 µW coupled output power at 10 mA forward current, features 0.1 µs rise/fall times, and operates across –40°C to +85°C. Used in light barriers and household electronics for galvanically isolated digital signal transmission.

For engineers reviewing the SFH756V datasheet, SFH756V pinout, SFH756V application, or SFH756V equivalent, key selection criteria include coupled optical output power into POF, spectral peak at 660 nm, thermal coefficient of output power (–0.4 %/K), surge current rating (1 A), and compatibility with wave soldering and auto-insertion processes.

Technical Context

This emitter is optimized for short-distance plastic fiber links up to ~30 cm, where its 2.2 mm aperture accepts standard 1000 µm POF without stripping. The molded microlens enhances coupling efficiency, yielding ≥100 µW optical output at IF = 10 mA - measured with large-area detection after a 30 cm fiber segment.

Its fast switching (t_R/t_F = 0.1 µs) supports data rates up to ~3.5 MHz under specified drive conditions (IF_LOW = 0.1 mA, IF_HIGH = 50 mA, R_G = 50 Ω). Thermal resistance (R_thJA = 450 K/W) and junction temperature limit (T_J = 100°C) constrain continuous operation at ambient temperatures above 60°C when dissipating >120 mW.

Key Specifications

Pinout & Package

Package: Plastic housing with integrated 2.2 mm aperture and mounting screw; surface-mount compatible with wave soldering and auto-insertion. Dimensions per Infineon File 4210 (SFH756V outline).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HFD201 and TFDU4101, SFH756V uniquely combines POF-optimized coupling, visible alignment capability, and SMT-ready packaging-making it the only choice for cost-sensitive, high-volume light barrier and appliance sensing where fiber handling simplicity and optical efficiency are critical.

Availability

SFH756V is available at Aetrix Electronics and suitable for household electronics, industrial light barriers, and optical network interconnects requiring stable component supply and long-term manufacturability.

Supply support for SFH756V 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.

SFH756V belongs to Infineon's legacy fiber-optic component family, developed specifically for cost-effective, robust plastic-fiber-based isolation and sensing in consumer and industrial equipment.

FAQ

What is the maximum recommended continuous forward current for SFH756V?

The absolute maximum DC forward current is 50 mA, but sustained operation at this level requires strict thermal management due to R_thJA = 450 K/W. At 25°C ambient, power dissipation reaches 105 mW (50 mA × 2.1 V), approaching the 120 mW total power limit. For reliability beyond 10 years, derate to ≤30 mA in enclosed housings.

Can SFH756V be used with glass optical fiber?

No - SFH756V is engineered exclusively for 1000 µm plastic optical fiber (POF). Its 2.2 mm aperture, microlens profile, and 660 nm emission spectrum are mismatched to the core size, NA, and transmission window of silica glass fibers. Attempting use with glass fiber yields negligible coupled power and unreliable operation.

Is SFH756V RoHS-compliant?

Yes - SFH756V was manufactured under Infineon's 2004 RoHS-compliant process. It contains no lead in solderable terminations (lead-free finish), and all materials meet EU Directive 2002/95/EC requirements. Certificate of Compliance is available upon request for batch-specific traceability.

Does SFH756V require a current-limiting resistor in series?

Yes - SFH756V must be driven with constant current or series-resistor biasing. With V_F ≈ 2.1 V and typical supply voltages (3.3 V or 5 V), a 100 Ω resistor limits current to ~32 mA at 5 V, staying within safe operating area. Direct connection to voltage sources risks thermal runaway and premature failure.