| Electronics > Beginners |
| Old radio, old transistors, old me... |
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| elmontador:
Hello, i have a old car radio (Blaupunkt FTZ-NR. U 108) AM FM mono, that uses 2 transistors (AD156 pnp, AD157 npn), i need to replace the transistors but its been a headache try to find a replacement. I found the following info online Type Designator: AD157 Material of Transistor: Ge Polarity: NPN Maximum Collector Power Dissipation (Pc): 8 W Maximum Collector-Base Voltage |Vcb|: 32 V Maximum Collector-Emitter Voltage |Vce|: 16 V Maximum Emitter-Base Voltage | Veb|: 10 V Maximum Collector Current |Ic max|: 2 A Max. Operating Junction Temperature (Tj): 85 °C Transition Frequency (ft): 1 MHz Forward Current Transfer Ratio (hFE), MIN: 50 Package: TO8 the only equivalent (allegedly) i found searching the internet is NTE131 NTE135 that are also obsolete i know that i can by on eBay old parts, but i don't want to wait a month just to find out that the transistor is a fake or does not work. I would appreciate some advice from you guys. THANKs :-[ |
| Cyberdragon:
NTE155: http://www.weisd.com/test/GenericParts_WEISD_view.php?editid1=AD157 AD157: https://www.donberg.ie/catalogue/semiconductors/semiconductors_a-ay/ad_157.html (note: min. order 20EUR) AD157: https://radio-antigua.com/ad157transistornosnewoldstock1pcc339u24f230514-p-603919.html?language=en (more expensive) |
| elmontador:
Thanks for the info, i wanted a modern replacement (i don't care about the transistor package) so i can buy it locally, if i don't find it i think i will stick with your second link cause i am in Europe. THANKs. |
| oldway:
You could replace them by AD161 and AD162, easier to find than AD156 and AD157. |
| exe:
Why not use digikey ([1]) filter to find what parts would a good replacement? Then just look what is available on the local market (or order from digikey, they deliver to EU too, although I never tries this by myself). Or you can buy something from tme.eu, they are in Polland and offer EU delivery. Or any other available distributor like rs-online, farnell or something. Most of them have parametric search (but not many transistors in metal can enclosure, unfortunately). Although, I can't really guarantee that replacement will work the same way as AD156. But I'd try to find parts similar in collector current, power dissipation, Hfe (if possible), and maximum frequency. [1] https://www.digikey.com/products/en/discrete-semiconductor-products/transistors-bipolar-bjt-single/276?FV=df00070%2Cdf0000d%2Cdf00011%2Cdf000d2%2Cdf00023%2Cdf00031%2Cmu2.2A%7C2101%2Cmu2.4A%7C2101%2Cmu2.5A%7C2101%2Cmu2.6A%7C2101%2Cmu2.7A%7C2101%2Cmu2A%7C2101%2Cmu3A%7C2101%2Cmu10W%7C2109%2Cmu12.5W%7C2109%2Cmu14W%7C2109%2Cmu15W%7C2109%2Cmu20.8W%7C2109%2Cmu20W%7C2109%2Cmu23W%7C2109%2Cmu24W%7C2109%2Cmu25W%7C2109%2Cmu26W%7C2109%2Cmu28W%7C2109%2Cmu29W%7C2109%2Cmu30W%7C2109%2Cmu7W%7C2109%2Cffe00114&quantity=&ColumnSort=0&page=1&pageSize=25 |
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