Product Overview

The CL04-12 is a high voltage diode specifically designed for microwave oven and industrial high voltage applications. With a 12 kV repetitive peak reverse voltage (VRRM) and 500 mA forward current, it ensures reliable performance in AC-powered microwave circuits and other high voltage systems.

This diode is part of the CL Series of high voltage diodes, renowned for:

* Robust construction
* Excellent reverse voltage endurance
* Low leakage current
* Stability across wide temperature ranges

It is ideal for microwave transformers, high voltage rectifiers, and pulse power systems.

Key Features

* Low Reverse Leakage
* Compact Form Factor

* Wide Operating Temperature
* Industrial and Household Applications

Electrical Specifications (Max @ 25 °C)

Electrical Characteristics (Tamb=25℃, all are max. values )	Symbol	Conditions	Rated Value	Unit
Repetitive Peak Reverse Voltage	V_RRM		12	KV
Average Forward Current max.	I_O	T_break=50℃	0.5	A
Max. Surge Current	I_FSM		30	A
Max. Forward Voltage Drop	V_FM	Ta=25℃	12	V
Max. Reverse Current	I_RRM		5.0	μA
Max. Temperature Junction	T_J		130	℃
Storage Temperature Range	Tstg		-40～+130	℃

Mechanical Dimensions

* Body Diameter: φ7.5 mm
* Length: 22 mm
* Lead Diameter: φ1.2 mm
* Package Type: Cylindrical epoxy‑sealed high voltage diode

SYMBOL	Dimension
	in	mm
Ф1	0.295	7.5
L1	0.866	22
Ф2	0.047	1.2
L2	0.866	22

product-823-396

Typical Applications

* Microwave oven high voltage rectifiers
* High voltage power supplies
* Pulse power circuits

* Electrostatic devices
* Industrial testing and measurement equipment

Why Choose CL04-12?

The CL04‑12 diode offers a perfect balance of high voltage capability and current handling for microwave and high voltage applications. Its reliable AC operation, low leakage, and fast recovery make it ideal for household and industrial high voltage circuits, ensuring safe, long-lasting performance.

CL Series microwave diode Overview – High Voltage Diodes

The CL Series is a family of high voltage diodes designed for microwave application:

Type	Rated Values				Temp. Condition		Electrical Characteristics [Ta=25℃, all are maximum values]			Dimension (Φ*bodyL, Φlead)**
Type	VRRM (KV)	IF(AV) (mA)	IFSM (A)	IRSM (A)	Tj (℃)	Tstg (℃)	VF (V)	IR1 (μA)	Trr (μS)	(mm)
CL01-09	9	350	30	--	130	-40~+130	10[IF=350mA]	5	--	Φ7.5*22/Φ1.2
CL01-12	12	350	30	--	130	-40~+130	12[IF=350mA]	5	--	Φ7.5*22/Φ1.2
CL01-15	15	350	30	--	130	-40~+130	13[IF=350mA]	5	--	Φ7.5*22/Φ1.2
CL04-09	9	500	30	--	130	-40~+130	10[IF=350mA]	5	--	Φ7.5*22/Φ1.2
CL04-12	12	500	30	--	130	-40~+130	12[IF=500mA]	5	--	Φ7.5*22/Φ1.2
CL01-12A	12	350	30	0.1	130	-40~+130	12[IF=350mA]	5	--	Φ7.5*22/Φ1.2
CL04-12A	12	500	30	0.1	130	-40~+130	12[IF=500mA]	5	--	Φ7.5*22/Φ1.2
CL01-12D	12	350	30	--	130	-40~+130	12[IFM=350mA]	5	--	φ5*9//φ1.0
CL01-12C	12	350	30	--	130	-40~+130	12[IFM=350mA]	5	--	φ4.5*15//φ1.0
2CL15KV/550mA	15	550	30	--	130	-40~+130	14[IF=550mA]	5	--	φ7.5*22/φ1.2

Series Advantages

* High voltage endurance
* Low reverse leakage
* Suitable for AC line frequency applications

* Compact and robust packages
* Wide temperature range for industrial and household use

Microwave Oven High-Voltage Diode Selection Guide

1. Function of the HV Diode in a Microwave Oven

The high-voltage diode in a microwave oven works together with the high-voltage capacitor to form a half-wave voltage doubler circuit. It converts the AC output from the high-voltage transformer (typically ~2,000 Vrms) to DC, doubling the peak voltage to approximately 4,000–5,000 VDC to power the magnetron .

If the diode fails (shorted or open), the magnetron will not receive sufficient voltage, and the microwave will fail to heat.

2. Key Selection Parameters

Parameter	Symbol	Typical Value for Microwave Diodes	Selection Guidance
Peak Repetitive Reverse Voltage	VRRMVRRM	4,000–12,000 V (most common: 9,000–12,000 V)	Must withstand transformer peak output + margin. Standard microwave diodes are rated for line frequency (50/60 Hz) use. Inverter microwaves require different diodes (see Section 4).
Average Forward Current	IF(AV)IF(AV)	350–500 mA	Magnetron typically requires 300–500 mA. Select diode with rating ≥ original specification.
Peak Surge Current	IFSMIFSM	150–250 mA (varies by model)	Handles startup inrush current.
Forward Voltage Drop	VFVF	6–10 V (at rated current)	Higher than standard diodes due to internal series construction. 10V is common for 9–12 kV types .
Reverse Leakage Current	IRIR	< 10 µA at rated voltage	Higher leakage indicates damage or poor quality.
Reverse Recovery Time	trrtrr	Critical distinction – see below	Determines compatibility with standard vs. inverter microwave designs.