SLVS005V − JULY 1978 − REVISED NOVEMBER 2003 recommended operating conditionsMINMAXUNIT VKA Cathode voltage Vref 36 V IKA Cathode current 1 100 mA TL431C, TL431AC, TL432C, TL432AC 0 70 TA T Operating free-air temperature range A °C ° TL431I, TL431AI, TL432I, TL432AI −40 85 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5