20CFF60 2.Production

Fast recovery diodes are PN junction diodes with the same structure and function as general rectifier diodes. While general rectifier diodes are suitable for commercial frequency rectification, fast recovery diodes are suitable for high frequency rectification due to their fast reverse recovery time (trr).

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Application

Power supplies
Industrial Equipment

Specifications

Series	Axial
Outline	DO-204AC (DO-15)
V_RRM [V]	600V
I_o [A]	2.0A
I_FSM [A]	40.0A
I_R [mA]	0.010mA
V_FM [V]	1.58V
t_rr [ns]	35.0ns
Operating Temperature Range	-40℃ ~ 150℃
R_th(j-c) [°C/W]	17.0 (j-l)°C/W
Connection type	A
Packaging style	Bulk
Quantity per Package	2000
Weight	0.350g

Packaging Specifications

Packaging style	Bulk
Quantity per Package	2000
Weight	0.350g

Engineering Documents

Product Specification / Drawing

20CFF60-file.pdf (646.95KB)

Environmental data

RoHS Compliance	Yes

RoHS_20CFF60.pdf (458.78KB)

TSCA_20CFF60.pdf (47.61KB)

FAQ

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It would be difficult to secure voltage balance in two high-speed FRDs connected in series directly (Connection where voltage protection is not coordinated). Especially for the commutation surge voltage in high-speed switching, shared voltage varies largely due to difference in reverse recovery characteristics of the two devices. Thermal influence of other components and exoergic environment also affect the difference largely. Therefore, it is possible that 100% of voltage would be applied to one device.
In order to suppress such differences, it is necessary to add a voltage dividing capacitor to each device to share the differences. There is no specified capacitance value for such voltage dividing capacitors because the value varies depending on the operating conditions. It is necessary to make sure whether the voltage can be surely shared by the capacitors so that their capacitances could be between several tens pF and several hundreds pF.
Ripping can be suppressed by these capacitors. In order to divide the steady reverse voltage in half, resistors in parallel are also required.
That is to say, adding capacitors or resistors is an only way to balance voltage. The point is that adding a resistor or a capacitor is an only way to get the voltage balance.

When connecting one-chip type elements such as axial type products or miniature SMD products, 1:0.6 (62.5% : 37.5%) would be an approx. value as a general theory. Since two-chip in an element such as represented by the TO-220 type is a package and has good heat balance, the good flow dividing ratio would be 1:0.8 (55.6% : 44.4%).

All values except for the graph of Junction capacitance vs. Reverse Voltage of SBD products are maximum values, which are guaranteed. Graphs of Junction capacitance vs. Reverse Voltage show typical values (TYP). The curves of the average forward current rating are formed by connecting points where the junction temperature reaches 150℃.

MSL standards are defined for SMDs to be reflow-soldered, and all Kyocera products are MSL: 1. (No need for damp proof packing)

The followings are recommended storage conditions for our power device products:

[Before unpacking]
Storage temperature: 5 to 35℃ / Storage humidity: 45 to 70% RH

Related Glossary

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PN type junction rectifying device. Diodes suitable for rectifying high frequency power supply with short reverse recovery time (trr).

[Diode]Allowable peak reverse voltage repetitively applicable to diode.
[Thyristor]Allowable peak reverse voltage repetitively applicable between anode and cathode.

A method of mounting components on a printed circuit board (PCB) by inserting component leads to be soldered into through-holes of a PCB and dipping it into a solder bath to mount the components.

[Diode]Allowable peak reverse voltage repetitively applicable to diode.
[Thyristor]Allowable peak reverse voltage repetitively applicable between anode and cathode.

[Diode] Maximum average forward current of commercial frequency (50Hz/60Hz) sin wave under condition.
[Thyristor] Maximum average on-state current of commercial frequency (50Hz/60Hz) half sin wave under specified condition.