There are many kinds of diodes, and fast recovery diode is a very common type. It is a diode with good switching characteristics and short reverse recovery time, which is applied in electronic circuits such as switching power supply, frequency converter and PWM pulse width modulator. The internal structure of fast recovery diode is different from ordinary PN junction diode, which belongs to PIN junction diode, that is, the base region I is added between P-type silicon material and N-type silicon material to form PIN silicon wafer. Because the base region is very thin and the reverse recovery charge is very small, the reverse recovery time of the fast recovery diode is short, the forward voltage drop is low and the reverse breakdown voltage (withstand voltage) is high. In this issue, Hottech introduces a commonly used diode FR107L in detail. This product is produced by Hottech Dongguan factory, and the product is stable and reliable, which is favored by our customers.

Characteristics of FR107L

FR107L adopts SOD-123FL package, which has excellent performance, fast recovery speed, high temperature tolerance and large rated voltage and current. Its DC reverse voltage is 1000V, forward current 1A, forward surge current 30A, reverse current 5/50μA, direct voltage 1.3V, reverse recovery time 500nS, and its weight is about 0.0155 g. This product is used in the circuit system, and its main function is to convert alternating current into direct current. In the practical application process, it is stable, reliable, mature in application, good in high temperature performance, good in unilateral conductivity, reverse leakage current and strong in quick recovery ability.

The thermal performance of SOD-123FL package is higher than that of SOD-123, and the thickness of SOD-123fl package is lower than that of standard SOD-123 package, which is very suitable for portable applications with limited circuit board space. The pin structure and clamp design of the package allow low direct voltage. The internal design of the attached clamp has better surge current capability than the lead bonding package, which is suitable for transient voltage suppression applications.

Application of FR107L

As a diode product with fast recovery ability, FR107L diode is widely used in rectifier circuit, switching circuit, power management, charging circuit, reverse protection circuit, etc. It can be seen in household appliances, lighting, PD fast charging, adapters, inverters, communication equipment, LCD TV, cameras, Bluetooth equipment, power supply and computer equipment. In the power switch circuit, FR107L can be used in the inductance buffer circuit to reduce the temperature and voltage peak of the switch tube, and also effectively reduce the switching time and power consumption, and improve the stability and working efficiency of the power circuit. In the reverse protection circuit, FR107L can effectively prevent the current in the circuit from flowing in the reverse direction and protect the circuit elements from being damaged. In the transformer output circuit, FR107L can be used to protect the two-terminal circuit and filter the half-bridge circuit. In many practical circuits, FR107 can also effectively reduce the noise and electromagnetic interference of switches in the circuit and improve the stability of the circuit.

The above picture shows a fast charging application circuit built by a customer using FR107L diode. The possible BOM of fast charging products in the market include power control chip, buck-boost converter, fast charging protocol chip, transformer, optocoupler, diode, triode, MOS tube, rectifier bridge, resistor, inductor, capacitor, LED lamp, fuse, heat sink, transformer and so on. Most fast charging products have overcurrent, overload, overvoltage and temperature protection, and the requirements for discrete device products are very high. FR107L diode can be used as a charge-discharge protection device in fast charging circuit. It can protect the charging and discharging system from damage when there is an abnormal situation in the process of charging and discharging.

Although the application of FR107L diode is mature and extensive, it is necessary for Hottech to remind customers that they should prevent overvoltage and choose appropriate reverse voltage and forward current when using the diode. To prevent FR107L diode from overheating, so as not to reduce or damage the service life of the device, select appropriate working temperature and heat dissipation mode. Pay attention to prevent reverse current, and choose appropriate reverse protection measures according to circuit requirements. Pay attention to prevent static electricity, and take appropriate anti-static measures, such as grounding and using electrostatic bracelets. Only by taking these precautions, it is possible to ensure the normal operation and life of the device and make the product more durable.