LOW LEVEL ZENER DIODES SHARP KNEE, LOW IMPEDANCE K511 - K681 • Unique manufacturing process • Remarkably sharp breaking diodes • Very low impedances at low current levels • Lowest values of impedance ever achieved at the 250uA level PART NUMBER K511 K561 K621 K681 NOMINAL ZENER VOLTAGE @ Iz = 250µA (Vdc) 5.1 5.6 6.2 6.8 Package Style DC Power Dissipation Derate above 50° C Forward Voltage Drop Operating Temperature (Topr) Storage Temperature (Tstg) Voltage Tolerance: DYNAMIC IMPEDANCE MAX Zz MAX Zzk @ Iz = 250 µA @ Iz = 1 mA (OHMS) (OHMS) 50 15 45 15 35 18 25 18 @ Ta = 50° C @ If = 100 mA Standard Device REVERSE CURRENT @ 25° C MAX Ir Vr (µA) (Vdc) .05 2.5 .05 3.5 .05 5.6 .05 6.4 DO-7 250 mW 2 mW / °C 1.3 Vdc -65 to + 175° C -65 to + 200° C ±10% P.O. BOX 609 • ROCKPORT, MAINE 04856 • 207-236-6076 • FAX 207-236-9558