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#1
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Polarity of 2SC1970 and 2SC1971
Hi All,
Two RF transistors, 2SC1970 and 2SC1971 are supposed to have BEC pinouts according to data sheets. However, it seems that such transistors with BCE pinout also exist; resistors in one circuit caught on-fire when I plugged a 2SC1971 into a BEC socket (based on data sheets, I assumed the transistor had BEC pinout). After replacing the resistors and bending the leads of the transistor, the circuit worked properly. Yes, the socket was wired correctly for BEC pinout. Has anyone ever come across the BCE pinout versions of 2SC1970 and/or 2SC1971? C.W. |
#2
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Two RF transistors, 2SC1970 and 2SC1971 are supposed to have BEC
pinouts according to data sheets. However, it seems that such transistors with BCE pinout also exist; resistors in one circuit caught on-fire when I plugged a 2SC1971 into a BEC socket (based on data sheets, I assumed the transistor had BEC pinout). After replacing the resistors and bending the leads of the transistor, the circuit worked properly. Yes, the socket was wired correctly for BEC pinout. Has anyone ever come across the BCE pinout versions of 2SC1970 and/or 2SC1971? ================================== According to Tower's International Transistor Selector , both 2SC1970 (Ic max=0.5A) and 2SC1971 (Ic max =1A) are NPN RF power transistors in a TO220 package Pinout 2SC1970 is BCE Pinout 2SC1971 is BEC The above pinouts are confirmed by the (PDF format) datasheets which I found by doing a Google. Frank GM0CSZ / KN6WH |
#3
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Scary!
I have noticed some with tabs isolated and some not. Gotta check the spec sheets. NTE replacements worked fine in TS2000 and are probably re-marked OEMs. Analog VOM would help. "Highland Ham" wrote in message ... Two RF transistors, 2SC1970 and 2SC1971 are supposed to have BEC pinouts according to data sheets. However, it seems that such transistors with BCE pinout also exist; resistors in one circuit caught on-fire when I plugged a 2SC1971 into a BEC socket (based on data sheets, I assumed the transistor had BEC pinout). After replacing the resistors and bending the leads of the transistor, the circuit worked properly. Yes, the socket was wired correctly for BEC pinout. Has anyone ever come across the BCE pinout versions of 2SC1970 and/or 2SC1971? ================================== According to Tower's International Transistor Selector , both 2SC1970 (Ic max=0.5A) and 2SC1971 (Ic max =1A) are NPN RF power transistors in a TO220 package Pinout 2SC1970 is BCE Pinout 2SC1971 is BEC The above pinouts are confirmed by the (PDF format) datasheets which I found by doing a Google. Frank GM0CSZ / KN6WH |
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