Powerful rectifier-limiting diodes of the KD2972 series. Reference data

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Powerful rectifier-limiting diodes of the KD2972 series. Reference data

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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Silicon rectifier-limiting diodes KD2972A2, KD2972B2 and KD2972V2, manufactured using epitaxial-planar technology, are designed to protect electronic components of cars and tractors, as well as equipment for general use from impulse overvoltage and conductive interference. In addition, diodes can be used as powerful low-voltage rectifiers.

The diodes are packaged in a plastic case KT28-1 (TO-220AS) with rigid stamped tinned leads (Fig. 1). Diode weight - no more than 2,5 g.

Powerful rectifier-limiting diodes of the KD2972 series

Diodes for protection are connected in parallel to the power circuit of the protected node, like a zener diode, i.e. in the opposite direction (VD1 in Fig. 2; diode VD2 serves to protect the module from emergency supply voltage in reverse polarity). To rectify alternating current, they are used in a conventional diode connection (the pinout in Fig. 1 is shown for this case).

Main Specifications

Constant reverse current, mA, no more, for KD2972A2 (at reverse voltage 20 V).....0,2
KD2972B2 (36 V) ..... 0,4
KD2972V2(14V).....0,2
Impulse forward voltage, V, not more than, at impulse forward current 35 A, pulse duration not more than 300 μs and duty cycle not less than 50 for KD2972A2..... 1,15
KD2972B2.....1,2
KD2972V2.....1,1
Diode opening voltage in reverse, V, at reverse current 10 mA and pulse duration less than 500 µs for KD2972A2.....22...32
KD2972B2.....40...50
KD2972V2.....18...23
Limiting impulse voltage (in reverse connection), V, not more, at a current through the diode of 45 A and a pulse duration of not more than 80 μs for KD2972A2..... 43
KD2972B2.....73
KD2972V2.....33
Thermal resistance transition-housing, °С/W, max.....1,3

Limit values

The largest repetitive impulse reverse voltage, V, for KD2972A2 ..... 20
KD2972B2.....36
KD2972V2.....15
The highest average forward current, A, at a case temperature of 100 ° C and a frequency of 50 Hz ..... 35
The largest non-repeating pulse forward current, A, at a case temperature of 125 ° C and a pulse duration of less than 1 ms..... 180
The highest current in the limiting mode, A, at a case temperature of 125 ° C and a pulse duration of less than 80 μs ..... 45
The highest transition temperature, ° С..... 150
Working range of ambient temperature, °С.....-60...+125

Permissible value of static potential - 200 V (III degree of rigidity according to OST 11 073.062). According to the installation conditions, diodes do not differ from transistors in a similar package.

On fig. 3 shows a typical view of the direct branch of the current-voltage characteristic of the diode at two values of the junction temperature, and in fig. 4 - dependence of the pulse voltage limiting diodes in the protection mode from the junction temperature.

Powerful rectifier-limiting diodes of the KD2972 series

Author: V.Kisilev, Minsk, Belarus

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