NSL19M51 – TBC

The NSL19M51 is a light-dependent resistor (LDR) utilizing a cadmium sulfide (CdS) photoconductive cell. Its resistance decreases with increasing light intensity. Characteristically, the device exhibits a dark resistance typically exceeding 1 MΩ, while resistance under illumination (e.g., at 10 lux) drops to the kΩ range, varying based on spectral content. The NSL19M51 is designed for applications requiring light-activated switching or analog light level sensing. Key parameters include its spectral response, peaking in the visible light spectrum, and its power dissipation rating, which must be observed to prevent thermal runaway and performance degradation. Response time, defined as the time required for the resistance to reach a specified percentage of its final value after a change in illumination, is a critical factor in dynamic applications. The device is typically supplied as a through-hole component.