1821-28-A1 is a multilayer thick film chip resistor from Bourns. It has a power rating of 2W, a tolerance of ±1%, an operating temperature range of -55°C to 150°C, and a maximum voltage rating of 350V. The resistors come in four sizes: 1820, 1821, 1822 and 1823, with footprints of 0402, 0603, 0805, and 1206 respectively. The 1821-28-A1 is constructed with a high-stability ceramic body, with two layers of inner conductor which are connected by a screen-printed layer of resistive material. This offers both high reliability and stability, while reducing the effect of transient changes in the ambient temperature.