Número de pieza	Fabricante / Marca	Breve descripción
U2403B(S)	ATMEL / MICROCHIP	U2403BS ATMEL ORIGINAL
U2403B-M	Microchip Technology	IC TIMER/CURRENT-CHARGE 8-DIP
U2403B-MFP	Microchip Technology	IC TIMER/CURRENT-CHARGE 8-SOIC
U2403B-MFPG3	Microchip Technology	IC TIMER/CURRENT-CHARGE 8-SOIC
U2403BMFPG3	ATMEL / MICROCHIP	U2403BMFPG3 ATMEL 4000tr