BY251 Diode

• Maximum Recurrent Peak Reverse Voltage: 200 V
• Maximum Average Forward Output Current: 3 A
• Maximum Forward Voltage Drop per element at 1.0A DC: 1.1 V
• Typical Junction Capacitance: 40 pF
• Package: DO-27
• Weight: 1.18 grams
• Operating and Storage Temperature Range: -65...+175 °C

The BY251 diode has a cathode (-) and anode (+). In the schematic symbol, the tip of the triangle with the line on top of it is the cathode. The cathode is marked on the body of a diode by a band as shown below.The current can flow from only the anode to the cathode and never from the cathode to the anode - the BY251 diode is like a one way electric valve.You can replace the BY251 with the 1N5402, 1N5402G, 1N5403, 1N5403G, 1N5404, 1N5404G, 1N5405, 1N5405G, 1N5406, 1N5406G, 1N5407, 1N5407G, 1N5408, 1N5408G, 6A10, 6A2, 6A4, 6A6, 6A8, BY252, BY253, BY254, BY255, FR303, FR304, FR305, FR306, FR307, FR603, FR604, FR605, FR606, FR607, HER303, HER304, HER305, HER306, HER307, HER308, HER503, HER504, HER505, HER506, HER507, HER508, P600D, P600G, P600J, P600K, P600M, SF34, SF35, SF36, SF38, SF54, SF55, SF56, SF58, UF5402, UF5404, UF5406, UF5407, UF5408