## Overview

The Vishay SFH692AT is a high-speed infrared emitter specifically designed for optical communication applications. It is optimized for pulse operation and is commonly used in data transmission systems, remote control devices, and optoelectronic sensor systems. The device is a GaAs infrared emitter packaged in a standard T-1 3/4 (5 mm) package with a clear epoxy lens, enabling focused emission and efficient coupling to optical systems.

## Absolute Maximum Ratings

* Forward Current (Continuous): 100 mA
* Peak Forward Current (Pulse, 100 μs, 1% duty cycle): 1 A
* Reverse Voltage: 5 V
* Power Dissipation: 150 mW
* Operating Temperature Range: -40 °C to +85 °C
* Storage Temperature Range: -40 °C to +100 °C

These limits define the safe operating boundaries and must not be exceeded to ensure reliable performance.

## Electrical and Optical Characteristics

* Forward Voltage (VF): 1.35 V typical at 20 mA forward current
* Reverse Current (IR): ≤ 100 μA at 5 V reverse voltage
* Radiant Intensity (IE): 200 mW/sr typical at 50 mA forward current
* Peak Wavelength (λp): 950 nm typical
* Spectral Bandwidth (Δλ): ±30 nm
* Viewing Angle (2θ1/2): 18° typical

The device operates efficiently in the near-infrared range, making it suitable for optical communication applications where high modulation speed is required.

## Dynamic and Switching Characteristics

* Rise Time (tr): ≤ 15 ns
* Fall Time (tf): ≤ 15 ns
* Capacitance (Ct): 40 pF typical at 0 V reverse bias, 1 MHz

These fast switching characteristics allow the SFH692AT to support high data rates, with low junction capacitance minimizing signal distortion.

## Package and Mechanical Data

* Package Type: T-1 3/4 (5 mm) round epoxy package
* Lead Material: Axial leads, tinned copper
* Lens Color: Clear
* Emitter Type: GaAs infrared diode
* Polarity: Anode and cathode clearly marked, with anode connected to the longer lead

The mechanical configuration allows straightforward PCB mounting and optical alignment in systems requiring directional infrared emission.

## Applications

* Infrared remote control systems
* Optical data transmission
* Optoelectronic sensors and encoders
* High-speed switching in communication devices
* Industrial automation requiring pulsed infrared sources

The combination of high-speed switching, directional emission, and robust packaging makes the SFH692AT a reliable choice for demanding optical communication environments.

## Thermal Management Considerations

* The maximum forward current and power dissipation ratings necessitate proper heat management in continuous operation.
* Pulse operation with low duty cycles is preferred to maintain junction temperature below maximum ratings.
* Mounting on a PCB with adequate copper area can assist in heat dissipation, enhancing device reliability.

## Reliability and Lifespan

* The SFH692AT is designed for long-term reliability under specified electrical and thermal conditions.
* Degradation of radiant intensity over time is minimal when operating within absolute maximum ratings.
* Encapsulation protects the GaAs emitter from environmental factors, including moisture and mechanical stress.

This combination of features ensures stable performance across a range of environmental conditions and application scenarios.