This design employs three NPN transistors and one PNP transistor. Can be used to generate a pseudo-complementary output with a Darlington – a true complementary pair would use both circuit configurations.Saturation voltage is higher than in a Darlington.A Darlington has a slightly lower gain. ![]() There is only one base-emitter drop between the compound transistor’s overall base and emitter.In practical, the total gain for both pairs is roughly equal to:Īlthough the Darlington is widely used, the Sziklai pair has several advantages and can be used effectively in a variety of applications.The gains of the Sziklai and Darlington are roughly equivalent.ĭarlington Pair Gain: βQ1 x βQ2 + βQ1 + βQ2.The second is a PNP type sziklai pair, with transistor Q1 being PNP and transistor Q2 being NPN. The first is an NPN sziklai pair, in which transistor Q1 is NPN and transistor Q2 is PNP. Sziklai pair have two configurations, as shown in the image above.The sziklai pair is commonly used in push-pull and class AB audio amplifier output stages. Darlington’s base-emitter voltage drop is twice as large. Sziklai’s configurations, on the other hand, have an equal base-emitter voltage drop to a normal transistor. Darlington and Sziklai both have two configurations.Because the Sziklai pair, unlike the Darlington arrangement, has one NPN and one PNP transistor, it is also known as the “complementary Darlington.” The Sziklai pair, also known as a complementary feedback pair in electronics, is a configuration of two bipolar transistors similar to a Darlington pair.CharacteristicsĬollector to emitter saturation voltage (VCE (SAT))īoth of these transistors had the same voltage and package specifications, other than this BC517 transistor had the highest DC current gain value than the BC547 transistor.īC517 is an NPN Darlington transistor device, so naturally, the gain value of it is higher and applications wish BC547 transistors have small-scale applications. In the table below, we try to compare two transistor devices such as BC517 and BC547. BC517 Darlington transistor complementaryīC516 PNP Darlington transistor is the complementary transistor of BC517 NPN Darlington transistor. The BC517 Darlington transistor has equivalent devices such as MPSW45A and 2N6426, both of these Darlington transistors have the almost same electrical and physical specifications, so we can use them as a replacement for the BC517 transistor. If you need the datasheet in pdf please click this link BC517 Darlington transistor equivalent BC517 NPN Darlington transistor DATASHEET The transition frequency value of the BC517 transistor is 220MHz, this transistor device has a high-frequency range. The thermal resistance of the BC517 Darlington transistor junction to the case is 83.3℃/W Transition frequency The junction temperature & operating temperature values are -55 to 150℃, and the BC517 transistor. Junction temperature/ storage temperature The DC current gain of the BC517 transistor is 30000Hfe, this is the important specification of this device. The power dissipation value of the BC517 transistor is 625mW, the dissipation value of this device will be laying on the transistor package. ![]() The collector current of the BC517 transistor is 1.2A, the switching load application of this transistor is under this value. The voltage specifications of the BC517 transistor shows that they have low voltage specs compared to other Darlington transistor device. The collector to emitter saturation voltage is 1V, it is a moderate voltage value for a semiconductor device. The voltage specs of the BC517 transistor are collector to emitter voltage is 30V, collector to base voltage is 40V and emitter to base voltage is 10V, the voltage value of this device is low. In this section we try to explain the electrical specs of the BC517 transistor, this detailed explanation will help us for a better understanding of the transistor and support for the replacement process. BC517 Darlington transistor electrical specification description/application Both of these two properties make the package more powerful to withstand the BC517 Darlington transistor. TO-92 package is made with epoxy or plastic material, this is the reason why they had higher resistance properties and lite weight. Base terminal is used to trigger the transistorīC517 Darlington transistor has a TO-92 package, it is a low-power transistor package.
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