## Technical Overview of SFH 4253R-R The **SFH 4253R-R** is a high-power Infrared (IR) Emitter manufactured by ams OSRAM. It belongs to the Power TOPLED® family and is specifically designed for high-performance optical applications requiring a compact footprint and high reliability. --- ### 1. Key Technical Specifications | Parameter | Value | Details | | :--- | :--- | :--- | | **Peak Wavelength** | 850 nm | High-efficiency infrared spectrum | | **Package** | Power TOPLED with Lens | Reverse Gullwing (R) configuration | | **Radiant Intensity** | 50 - 100 mW/sr | Measured at $I_F = 70$ mA | | **Forward Voltage** | 1.5 V (Typ) | $V_F$ at $70$ mA | | **Half Angle** | ±15° | Narrow beam for focused illumination | | **Switching Times** | 12 ns / 12 ns | Fast rise and fall times | --- ### 2. Core Features * **Reverse Mount Design:** The "R" suffix indicates a reverse gullwing lead configuration, allowing the component to be mounted on the back of a PCB while emitting through a hole, or used in low-profile designs. * **High Speed:** With switching times in the 12 ns range, it is suitable for high-frequency modulated signals or data transmission. * **Narrow Emission:** The integrated lens provides a ±15° emission angle, which significantly increases the radiant intensity compared to standard flat-top LEDs. * **AEC-Q101 Qualified:** It meets automotive industry standards for reliability and durability. --- ### 3. Pin Configuration and Internal Logic The device is a standard two-terminal semiconductor diode. In the reverse mount package: 1. **Anode:** Connected to the positive supply. 2. **Cathode:** Connected to the ground/switch side (marked with a notch or polarity sign on the package). ```text [ Cathode ] ---|<|--- [ Anode ] (K) (A) ``` --- ### 4. Typical Applications * **Infrared Illumination:** Used for cameras and CCTV night vision. * **Sensor Technology:** Proximity sensors and light barriers. * **Automotive:** Interior sensing, gesture recognition, and driver monitoring systems. * **Data Transmission:** High-speed IR communication links. ---