Transistor KT815: parameters, pinout and analogues. 7Gv1 transistor characteristics

Based on the technical characteristics of the KT815 series of bipolar transistors, they are manufactured using epitaxial-planar technology. It consists of several groups of devices, mainly differing in the maximum possible transmission voltage between the collector and emitter contacts.

These are silicon, low-frequency, high-power devices with an NPN structure. They can be confidently called one of the most common transistors in electrical engineering of Soviet times before 1990. They were widely used in linear and key circuits, used in outdated domestic amplifiers (for example, Odyssey U-10, Vega 10U-120), various converters and pulsed devices.

Performance Limits

It is worth noting that the cutoff frequency for these transistors is around 3 MHz, and is rarely indicated in the documentation.

Color music console for P213.

A very simple color music console can be assembled using three P213 transistors. Three separate amplifier stages are designed to amplify three audio frequency bands. The cascade on transistor VT1 amplifies the signal at a frequency above 1000Hz, on transistor VT2 - from 1000 to 200Hz, on transistor VT3 - below 200Hz. Frequency separation is carried out by simple RC filters.

The input signal is taken from the output of the speakers. Its level is adjusted using potentiometer R1. To adjust the brightness level of each channel, trimming resistors R3, R5, R7 are used. The bias at the bases of the transistors is determined by the values ​​of resistors R2, R4, R6. The load of each stage is two parallel-connected light bulbs (6.3 V x 0.28 A). The circuit is powered by a power supply with an output voltage of 8-9 V and a maximum current of over 2A.

P213 transistors can have a significant spread in current amplification. Therefore, the values ​​of resistors R2, R4, R6 must be selected for each stage individually. The collector current is adjusted to such a value that the filaments of the lamps glow a little in the absence of an input signal. In this case, the transistors will definitely heat up. The stability of germanium semiconductor devices is highly dependent on temperature. Therefore, it is necessary to install P213 on radiators with an area of ​​75 sq.cm.

Electrical parameters

Foreign prototypes

• KT815B – BD135
• KT815V - BD137
• KT815G - BD139

15 thoughts on “KT815 parameters”

This transistor cannot be called powerful, despite the 8 in the marking. It is closer to medium power, and in high-power circuits it is used as a preliminary for 819s and higher. As the main drawback, I would highlight the gain spread, and in some circuits this is important. For some reason, the cutoff frequency is not given, but it is also not very high. In a word - an ordinary, averagely parameterized transistor for household use. Yes, the initial nonlinearity is also tightened up; the amplifications are not good for all classes.

The cutoff frequency of KT815 for a circuit with a common emitter is 3 MHz. ps Like all domestic “purely civilian” transistors, the spread of KT815 parameters is very large.

I assume that the civilian “KT” transistors were a rejection of the military “2T” transistors. We tested the crystals, the better ones went into metal, the worse ones went into plastic. It was precisely because of this dispersion that factories even had such a profession as “regulator”.

Foreign transistors are also different. I ordered BD139 and BD140 from the Chinese on Aliexpress, actually analogues of KT814 and KT815. I was tired of choosing pairs according to h21e. To be able to talk about high repeatability of parameters, you need to buy from Western suppliers. But I looked at the retail prices for the BD139 and BD140 on Mouser Eletronics and I'm sick of them. Abroad, in the same way, transistors for household appliances are made in China, for military and industrial needs in Europe and the USA. The first ones will please your soul, the second ones are strictly based on technology and with careful output control. And the latter will never make it into consumer electronics, because they are unprofitable.

Installation conditions

When using KT815 transistors and their installation, you should adhere to the following rules:

• The bend of the transistor leads should be at least 5 mm from the body, while the radius of curvature should be in the region of 1.5 to 2 mm;
• Installation in which force will be transmitted to the housing is not allowed;
• When soldering a transistor, it is necessary to keep the soldering iron tip at a distance of at least 5 mm from the body;
• The leads must be soldered at a temperature not exceeding 250 °C for no more than 2 seconds.

Pinout

The pinout for the entire KT815 series is the same. The transistor is widely used in a plastic case for hole mounting - KT-27 (foreign analogue of TO-126). If you look at its alphanumeric designation, then the first leg on the left is the emitter (E), the second is the collector (K), the third is the base (B). There is a hole (3 mm) for attachment to the heat sink. The weight of such products does not exceed 1 gram.

This transistor is also found for surface mounting KT-89 (aka imported DPAK). In this solution, it has the following pinout - B.K.E. (collector on top). Now this is a rarity; it is produced exclusively in Belarus at the enterprises of JSC INTEGRAL.

The collector output of these electronic components, in both types of housings (KT-27 and KT-89), has a small metal base at the back for connection to the radiator. It can be seen if you look at the product from the back.

Analogs

It is worth noting that the KT817 transistor has a wide range of models, allowing you to select a replacement for each of the KT815 modifications.

Note: the data in the table is taken from the datasheet of the manufacturing companies.

Transistors KT815

Transistors KT815 - silicon, powerful, low-frequency, structures - npn. Used in amplifier and generator circuits. The case is plastic, with flexible leads. Weight - about 1 g. Alphanumeric markings on the side surface of the case, can be of two types.

Coded four-digit marking on one line and non-coded marking on two. The first character in the coded marking KT815 is the number 5, the second character is a letter indicating the class. The next two characters indicate the month and year of issue. In non-coded markings, the month and year are indicated in the top line. The figure below shows the pinout and markings of KT815.

Transistor KT815: parameters, pinout and analogues. 7Gv1 transistor characteristics

When selecting analogue parts according to diagrams, the question of their correct installation on the printed circuit board always arises. Pinout of transistors. Now I want to describe and lay out on one page the pinouts (pinouts) of all domestic transistors, so that you are not misled by the question of the location of the transistor legs

2T709A2, 2T709B2, 2T709V2, 2T716A1, 2T716B1, 2T716V1, KT812A, KT818A, KT818B, KT818V, KT818G, KT819A, KT819B, KT819V, KT819G, KT805AM, KT805BM, KT805VM, KT805IM, KT819A, KT819B, KT819V, KT819G, KT835A, KT835B, KT837A, KT837B, KT837V, KT837G, KT837D, KT837E, KT837ZH, KT837I, KT837K, KT837L, KT837M, KT837N, KT837P, KT837R, KT837S, KT837T, KT837U, KT837 F KT858A, KT859A, KT812A, KT829A, KT829B, KT829V, KT829G, KT850A , KT850B, KT850V, KT851A, KT851B, KT851V, KT852A, KT852B, KT852V, KT852G, KT853A, KT853B, KT853V, KT853G, KT854A, KT854B, KT855A, KT855B, KT8 55V, KT857A, KT863A, KT899A, KT8108A, KT8108B, KT8109A, KT8109B , KT8110A, KT8110B, KT8110V, KT8140A, KT8116A, KT8116B, KT8116V, KT8118A, KT8120A, KT8121A, KT8121B, KT8123A, KT8124A, KT8124B, KT8124V KT1 17A, KT117B, KT117V, KT117G KT201A, KT201B, KT201V, KT201G, KT201D, KT203A, KT203B , KT203V, KT3102A, KT3102B, KT3102V, KT3102G, KT3102D, KT3102E, KT3102ZH, KT3102I, KT3102K, KT3108A, KT3108B, KT3108V, KT3117A, KT3117B, KT3 127A, KT3128A, KT313A, KT313B, KT316A, KT316B, KT316V, KT316G, KT316D, KT342A , KT342B, KT342V, KT347A, KT347B, KT347V, KT349A (version 1), KT349B (version 1), KT349V (version 1), KT363A, KT363B KT208A, KT208B, KT208V, KT208G, KT208D, KT 208E, KT208Zh, KT208I, KT208K, KT208L, KT208M , KT339A, KT339B, KT339V, KT339G, KT339D, KT501A, KT501B, KT501V, KT501G, KT501D, KT501E, KT501Zh, KT501I, KT501K, KT501L, KT 501M KT201AM, KT201BM, KT201VM, KT201GM, KT201DM, KT203AM, KT203BM, KT203VM, KT208A1, KT208B1, KT208V1, KT208G1, KT208D1, KT208E1, KT208Zh1, KT208I1, KT208K1, KT208L1, KT208M1, KT209A, KT209B, KT209B1, KT209V, KT209V1, KT209V2 , KT209G, KT209D, KT209E, KT209ZH, KT209I, KT209K, KT209L, KT209M, KT502A, KT502B, KT502V, KT502G, KT502D, KT502E, KT503A, KT503B, KT503V, KT503G, KT503D, KT503E, KT306AM, KT306BM, KT306VM, KT306GM, KT306DM, KT3102AM, KT3102BM, KT3102VM, KT3102GM, KT3102DM, KT3102EM, KT3102ZhM, KT3102IM, KT3102KM, KT3107A, KT3107B, KT3107V, KT3107G, KT3107D, KT3107E, KT3107Zh, KT3107I, KT3107K, KT3107L, KT3117A1, KT3126A, KT3126B, KT3128A1, KT313AM, KT3 13BM, KT316AM, KT316BM, KT316VM, KT316GM, KT316DM, KT349A (version 2), KT349B (version 2 ), KT349V (version 2), KT342AM, KT342BM, KT342VM, KT342GM, KT342DM, KT345A, KT345B, KT345V, KT350A, KT351A, KT351B, KT352A, KT352B, KT355AM, KT363AM, KT3 63BM, KT368AM, KT368BM KT306A, KT306B, KT306V, KT306G, KT306D KT601AM, KT601AM, KT602AM, KT602BM, KT814A, KT814B, KT814V, KT814G, KT815A, KT815B, KT815V, KT815G, KT816A, KT816A2, KT816B, KT816V, KT81 6G, KT817A, KT817B, KT817B2, KT817V, KT817G, KT817G2, KT818A, KT818B , KT818V, KT818G, KT8130A, KT8130B, KT8130V, KT8131A, KT8131B, KT8131V, KT940A, KT940B, KT940V, KT961A, KT961B, KT961V, KT969A, KT972A, KT97 2B, KT973A, KT973B, KT997A, KT997B, KT9115A KT3101A-2, KT3115A- 2, KT3115V-2, KT3115G-2, KT3123A-2, KT3123B-2, KT3123V-2, KT372A, KT372B, KT372V, KT391A-2, KT391B-2, KT391V-2 KT3109A, KT3109B, KT3109V KT312A, KT312B, KT312V, KT325A, KT325B, KT325V KT3120A, KT371A, KT382A, KT382AM, KT382B, KT382BM KT3129A-9, KT3129B-9, KT3129V-9, KT3129G-9, KT3129D-9, KT3130A-9, KT3130B-9, KT3130V-9, KT3130G- 9, KT3130D-9, KT3130E-9, KT3130Zh-9, KT3168A-9 KT315A, KT315B, KT315V, KT315G, KT315G1, KT315D, KT315E, KT315Zh, KT315I, KT315N, KT315R, KT36 1A, KT361B, KT361V, KT361G, KT361G1, KT361D , KT361E, KT361ZH, KT361I, KT361K KT3157A, KT325AM, KT325BM, KT325VM, KT339AM KT368A, KT368B, KT399A, KT399AM KT504A, KT504B, KT504V, KT505A, KT5 05B, KT506A, KT506B KT601A KT602A, KT602B, KT602V, KT602G, KT801A, KT801B KT807A , KT807B KT872A, KT872B, KT872V, KT8111A, KT8111B, KT8111V, KT8114A, KT8114B, KT8114V KT879A, KT879B KT886A1, KT886B1, KT8127A1, KT8127B1, KT8127V1 KT890A, KT890B, KT890V, KT896A, KT896B, KT896V, KT898A, KT898B, KT8101A, KT8101B , KT8102A, KT8102B, KT8106A, KT8106B, KT8117A KT898A1, KT898B1 KT999A GT313A, GT313B, GT313V GT328A, GT328B, GT328V, GT346A, GT346B, GT346V G T906A GT905A, GT905B, GT906AM 2T713A, KT812B, KT812V, 2T812A, 2T812B, KT818AM, KT818BM, KT818VM, KT818GM, 2T818A, 2T818B, 2T818V, KT819AM, KT819BM, KT819VM, KT819GM, 2T819A, 2T819B, 2T819V, 2T825A, 2T825B, 2T825V, KT825 G, KT825D, KT825E, KT710A, KT808AM, KT808BM, KT808VM, KT808GM, KT812B, KT812V, 2T812A, 2T812B, KT819AM, KT819BM, KT819VM, KT819GM, 2T819A, 2T819B, 2T819V, 2T825A, 2T825B, 2T825V, KT825G, KT825D, KT825E, KT826A, KT826B, KT826V, KT827A, KT827B, KT827V, KT828A, KT828B, KT834A, KT834B, KT834V, KT838A, KT839A, KT840A, KT840B, KT841A, KT841B, KT841V, KT846A, KT846B, KT846V, KT847A, KT848A, KT8127A, KT8127B, KT8127V, KT878A, KT 878B, KT878V, KT892A, KT892B, KT892V, KT897A, KT897B, KT8104A, KT8105A, KT8107A, KT8107B, KT8107V, KT8129A, KT945A

If, nevertheless, I did not get a complete list of pinouts (pinouts) of transistors, then please indicate this in the comments to this post, or if you notice any errors, deviations in the description of pinouts (pinouts) of transistors.

Technical specifications

KT815B has average technical parameters when compared with other transistors in this series. The datasheet states that it is capable of passing through itself a maximum voltage of up to 50 V and a current of up to 1.5A, with a possible power loss of up to 10 W (using a radiator). Such values ​​allow it to be used for various electronic applications. Here is a detailed list of maximum permissible electrical operating modes:

• voltage between: K-E up to 50 V (REB ≤100 Ohm); E-B up to 5 V;
• collector current: constant up to 1.5 A; pulse up to 3 A;
• base current up to 0.5 A;
• power dissipation on the collector: up to 10 W (with radiator); up to 1 W (without heat sink);
• temperature: crystal up to +150 °C; environmental range -60 to +125 °C;
• weight up to 0.9 g.

KT815B has a relatively small static current gain H21E (from 40). At the same time, in practice it is significantly less than that presented in the technical description. It is very difficult to select devices with the same H21E, much less find a complementary pair for it. Therefore, most radio amateurs prefer to use its foreign analogues in their developments.

Electrical

Next, we will consider the main electrical parameters of the KT815B. They are indicated for an ambient temperature around the housing of no more than +25°C. A separate column shows the measurement conditions.

In the technical description of the device, Russian manufacturers do not show the parameter “thermal resistance between the junction and the housing.” Most radio amateurs use its value for calculations - 10 °C/W. It is also generally accepted that this series has a cut-off frequency fT that does not exceed 3 MHz, therefore it is considered low-frequency.

Analogs

KT815B(KT-37) has imported analogues, these include BD135(TO-126). You can also consider replacements that are similar in their technical data and description: 2SA490, 2SA67, BD176, BD234,BD438, BD616, BD934 TIP32A. You can get from domestic manufacturers: KT817B, KT815V, G. The devices in the KT-89 package have no complete analogues.

Complementary pair

The complementary pair with the PNP structure will be KT814B.

Transistor KT815: parameters, pinout and analogues. 7Gv1 transistor characteristics

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Comments

people will buy transistar kt 827A 0688759652

how young we were and how quickly the years passed kulotino my happiest time

An LED is a diode that emits light. And if the diode has IR radiation, then it is an IR diode, and not “IR LED” and “Infrared LED”, as indicated on the website.

Tell me 2t963a-2 warranty period

Frame:

Good transients. I put them in power supplies, tried to load them up to 2 amps, they hold, but not all of them hold. Some burn out. But at 1.8 amps with a radiator of 350 sq. cm, I stood under load for 4.5 hours, temperature 78 C°... it didn’t burn out, everything was ok. So these trannys are good.