Zener diode model comparison table: CCTV Tester,Cctv Camera Tester,Monitor Tester,IP Camera Test Monitor Chinasky Electronics Co., Ltd. , https://www.chinacctvproducts.com Original model Foreign model Regulated value Domestic replacement model 1N746 H23 MA4030 RD417E RD217EB 2.5-3.5 2CW51 1N747 1N748 1N749 HZ4 RD3.9E 3.9-4.5 2CW52 1N750 1N751 HZ5 05Z5.1 RD5A RD5.1E 4-5.8 2CW53 1N752 1N751 HZ5 05Z5.1 RD5A RD5.1E 5.5-6.5 2CW54 1N754 HZ6.8E 02Z6. 8A RD6.8E RD7A 6.2-7.5 2CW55 1N755 1N756 HZ7 HZ7.5E 05Z7.5 RD7.5 7-8.5 2CW56 1N757 HZ9 RD9A 8.5-9.5 2CW57 1N758 HZ10A RD10E 9.2-10.5 2CW58 1N714 1N962 1S335 HZ11 HZ11E RD11E 10-11.8 2CW59 1N963 HZ12E 05Z12 BZX79C12 RD12E 11.5-12.5 2CW60 1N717 1N964 1S270 HZ12B2 MA1130 12.2-14 2CW61 1N718 1N965 1N966 HZ15-1 05Z15 RD15E 13.5-17 2CW62 1N967 HZ18-1 HZ18-2 05Z18 RD18E 16-19 2CW63 1N968 HZ20-1 RD20E 18-21 2CW64 1N969 HZ24E RD24E 20-24 2CW65 1N970 02Z24 23-26 2CW66 1N971 HZ27 25-28 2CW67 1N972 RD31E 27-32 2CW68 1N973 1N974 HZ733 ZX0249E UPC574J 31-35 2CW69 2CW70