High voltage rectifier diodes. Reference data

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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High voltage rectifier diodes. Reference data

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KD243A-KD243J

Rectifier diodes KD243A-KD243Zh are produced in a standard plastic cylindrical case KD-4B with rigid tinned wire leads (Fig. 1). Weight of the device - no more than 0,5 g.

High Voltage Rectifier Diodes

A circular (ring) mark is applied to the body from the side of the cathode terminal, which is a color code for the type of diode: the letter index A corresponds to a purple mark, B is orange, C is red, G is green, D is yellow, E is white, and G is blue.

Foreign analogues of KD243A-KD243Zh devices are widespread diodes 1N4001-1N4007, respectively.

Basic electrical characteristics

Constant forward voltage drop, V, no more, at direct current 1 A and ambient temperature 25°C -60 ° C	1,1 1,3
DC reverse current, µA, no more, at maximum allowable reverse voltage and ambient temperature 25°C 125°C	10 50

Limit values

Maximum reverse voltage, V, at case temperature ranging from -60 to +125°C for KD243A KD243B KD243V KD243G KD243V KD243E KD243J	50 100 200 400 600 800 1000
Maximum direct and average forward current, A, at case temperature -60 ... + 75 ° C + 125 ° C	1 0,5
Maximum rectification frequency (without derating), kHz	1

Typical static current-voltage characteristics of diodes KD243A-KD243Zh at two case temperatures for forward and reverse voltage are shown in fig. 2 and 3, respectively. These diodes successfully replace devices of outdated series KD208, KD209 in all devices.

High Voltage Rectifier Diodes

KD247A-KD247E

Rectifying high-speed diodes KD247A-KD247E are produced in the same package as diodes KD243A-KD243Zh (Fig. 1). On the case, from the side of the cathode terminal, two (and not one, as in the KD243 series diodes) circular single-color marks are applied: for the KD247A diode - orange, for KD247B red, for KD247V - green, for KD247G - yellow, for KD247D - white, for KD247E - purple.

Basic electrical characteristics

Constant forward voltage drop, V, no more, at direct current 1 A and ambient temperature 25°C -60 ° C	1,3 1,5
DC reverse current, µA, no more, at maximum allowable reverse voltage and ambient temperature 25°C 125°C	5 100
Reverse recovery time, ns, at 0,5A forward current, 1A reverse current at 0,25A reference level and 25°C ambient temperature KD247A-KD247G, KD247E KD247D	150 250

Limit values

Maximum DC reverse voltage, V, at case temperature from -60 to +125°C for KD247A KD247B KD247V KD247G KD247V KD247E	100 200 400 600 800 50
Maximum reverse operating and repetitive impulse reverse voltage, V, at case temperature from -60 to +125°C for KD247A KD247B KD247V KD247G KD247V KD247E	100 200 400 600 800 50
Maximum direct and average forward current, A, at case temperature -60 ... + 55 ° C + 125 ° C	1 0,2

Typical static current-voltage characteristics of diodes KD247A-KD247E at two case temperatures for forward and reverse voltage are shown in Figs. 4 and 5, respectively.

High Voltage Rectifier Diodes

KD257A-KD257D

Rectifier diodes KD257A-KD257D with increased forward current and heat resistance are made in a standard drop-shaped glass case KD-29V with rigid tinned wire leads (Fig. 6). Weight of the device - no more than 1 g.

High Voltage Rectifier Diodes

On the body of the diodes, in addition to the black ring mark indicating the cathode terminal, three digits are applied - the year and month of manufacture (1990 - 0,1991 - 1, etc.; January - 01, February 02, ... December - 12), followed by a shortened marking (without the letters KD) of the diode type.

Basic electrical characteristics

Continuous forward voltage drop, V, no more, at direct current 5 A and case temperature 25°C	1,5
DC reverse current, µA, no more, at maximum allowable reverse voltage and ambient temperature 25°C 165°C	2 150
Reverse recovery time, ns, when switching from direct current 1 A to reverse voltage 30 V for KD257A-KD257V KD257G, KD257D	250 300

Limit values

Maximum operating pulse reverse voltage, V, at pn-junction temperature -45...+175°C for KD257A KD257B KD257V -45...+170°C for KD257G KD257D	200 400 600 800 1000
Maximum average forward current, A, at case temperature -45...+55°C for KD257G, KD257D -45...+65°C for KD257A-KD257V	3 3
Case temperature at which the average forward current must be reduced to zero, °C	155

Typical static volt-ampere characteristics of diodes KD257A-KD257E at some case temperatures for forward and reverse voltage are shown in fig. 7 and 8, respectively.

High Voltage Rectifier Diodes

KD258A-KD258D

Rectifier diodes KD258A-KD258D are produced in a standard drop-shaped glass case KD-29A with hard wire leads (Fig. 9). Weight of the device - no more than 1 g.

High Voltage Rectifier Diodes

On the body of the diodes, in addition to the black ring mark indicating the cathode terminal, the year and month of manufacture and the brand of the diode are applied in the same way as for diodes of the KD257 series.

Basic electrical characteristics

Constant forward voltage drop, V, no more, at direct current 3 A and ambient temperature 25°C	1,6
Constant reverse current, µA, no more, at the maximum allowable reverse voltage and ambient temperature 25°C 165°C	2 150
Reverse recovery time, ns, when switching from direct current 1 A to reverse voltage 30 V for KD258A, KD258B KD258V-KD258D	250 300

Limit values

Maximum operating pulse reverse voltage, V, at pn-junction temperature -45...+175°C for KD258A KD258B KD258V -45...+170°C for KD258G -45...+165°C for KD258D	200 400 600 800 1000
Maximum average forward current, A, at case temperature -45...+55°C for KD258G, KD258D -45...+65°C for KD258A-KD258V	1,5 1,5
Case temperature at which the average forward current must be reduced to zero, °C	155

Typical static current-voltage characteristics of KD258A KD258D diodes at several case temperatures for forward and reverse voltage are shown in fig. 10 and 11, respectively.

High Voltage Rectifier Diodes

On all graphs I_arr=f(U_arr) on the horizontal axis are plotted in relative units of the ratio of the current values of the reverse voltage to the maximum allowable reverse voltage U_o6p.o=U_o6p/U_{o6p max.}

In the intermediate temperature range (for KD243A-KD243Zh 75...125°C; for KD247A-KD247D 55...125-°C; for KD257G, KD257D, KD258G, KD258D - 55...155°C; for KD257A- KD257V, KD258A-KD258V - 65...155°C) the direct average current of the diodes must be reduced as the body temperature increases according to a linear law.

The technical conditions prescribe to measure the case temperature at the diode output at a distance of 2 mm (for the KD-4B case) and 10 mm (for the KD-29A and KD-29V case) from the edge of the case. A distinctive design feature of the considered diodes is the mounting of the crystal on a pre-flattened output. Therefore, by the way, when mounting diodes on a board, the leads should be bent no closer than 3 ... 5 mm from the edge of the case in order to avoid breakage of the crystal, and the bending radius should not be less than the lead diameter.

It is necessary to effectively remove heat from the crystal of these diodes directly through the leads. The relatively low speed and increased static losses in the diodes lead to the fact that at a voltage and current not exceeding 30...50% of the maximum allowable values, a frequency of 20 kHz and an ambient temperature of 25°C, the diodes heat up to a temperature of 80...100 °C

Therefore, it is possible to increase the "collection" of the rectified current from the diode only if it is mounted on a board with short leads, and the mounting sites should be made as large and well-ventilated as possible.

Author: A.Mironov, Lyubertsy, Moscow Region

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