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. What is beta (hFE) and why does its value vary so much? What are the major causes of his variation? Make an estimate of the minimum and the maximum values for beta from me data sheet for a 2N4124 when it is operated at Ic = 2 mA over its whole temperature ange

. What is beta (hFE) and why does its value vary so much? What are the major causes of his variation? Make an estimate of the minimum and the maximum values for beta from me data sheet for a 2N4124 when it is operated at Ic = 2 mA over its whole temperature ange

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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**Transcription:** What is beta (h_FE) and why does its value vary so much? What are the major causes of this variation? Make an estimate of the minimum and the maximum values for beta from the data sheet for a 2N4124 when it is operated at I_C = 2 mA over its whole temperature range. --- **Explanation:** - **Beta (h_FE)**: This is the current gain or amplification factor of a bipolar junction transistor (BJT). It indicates the ratio of the collector current to the base current. A high beta value means a small base current can control a larger collector current. - **Variation Causes**: Beta can vary due to manufacturing differences, temperature changes, and transistor aging. Thermal effects often have a significant impact on beta, causing it to either increase or decrease depending on the specifics of the transistor material and structure. - **Estimating Beta Values**: To estimate the minimum and maximum beta values, refer to the manufacturer's datasheet for the specific transistor type (in this case, a 2N4124) at the specified collector current and over the entire temperature range. This will provide precise beta limits given realistic operating conditions.
Transcribed Image Text:**Transcription:** What is beta (h_FE) and why does its value vary so much? What are the major causes of this variation? Make an estimate of the minimum and the maximum values for beta from the data sheet for a 2N4124 when it is operated at I_C = 2 mA over its whole temperature range. --- **Explanation:** - **Beta (h_FE)**: This is the current gain or amplification factor of a bipolar junction transistor (BJT). It indicates the ratio of the collector current to the base current. A high beta value means a small base current can control a larger collector current. - **Variation Causes**: Beta can vary due to manufacturing differences, temperature changes, and transistor aging. Thermal effects often have a significant impact on beta, causing it to either increase or decrease depending on the specifics of the transistor material and structure. - **Estimating Beta Values**: To estimate the minimum and maximum beta values, refer to the manufacturer's datasheet for the specific transistor type (in this case, a 2N4124) at the specified collector current and over the entire temperature range. This will provide precise beta limits given realistic operating conditions.
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