| Electronics > Beginners |
| In need to replace a JRC or STMicro 317 Voltage Regulator. Which brand is best? |
| (1/2) > >> |
| zdelarosa00:
Which brand is best? In my knowledge, the big names that make the part are JRC, TI and STMicroelectronics. I don't know with facts, but my personal ranking in terms of quality/performance(?) would be: 1.-JRC 2.-Texas Instruments 3.-STMicroelectronics In terms of brand name, reputation, quality, known facts, numbers, performance of the parts, scope of the usual equipment that has them (demands of the application). But I really don't know what can change from brand to brand talking about exactly the same part, apart from volume and packaging plastic. I really don't see JRC around much though. So maybe I'm biased by popularity. |
| floobydust:
I find a difference between brands, some makes of LM317 and 78xx are very noisy. Fairchild is shit, LT the best but very expensive. If it's a noise critical application, like audio or metrology, measure it with a scope and be prepared for huge differences in quality. |
| floobydust:
Some 1-lot Digikey $USD prices: LT317AT(LT) $4.85 LM317BT (ST) $0.64 "single gauge" thin tab TO-220, absolute garbage LM317T-DG (ST) $0.64 "double gauge" LM317T (On-Semi) $0.71 "single gauge" thin tab TO-220, absolute garbage The limitation is a 3-pin package can't have a bypass cap across the reference. But these IC's spoiled us they are so convenient. The low noise Super Regulators from Walt Jung's work uses low noise op-amps AD825, AD848, AD797 etc. - all expensive. I haven't tried using a cheapo NE5534 or similar with discrete pass transistor. |
| wraper:
--- Quote from: floobydust on October 12, 2019, 09:50:50 pm ---LM317T (On-Semi) $0.71 "single gauge" thin tab TO-220, absolute garbage --- End quote --- Performance wise it does not matter. And it's not ON semi only who does this. ST does exactly the same thing. Though you probably should avoid mounting it with a screw and use spring clip instead. |
| floobydust:
There's a thermal performance hit - try it. You won't find thermal data on this cornball package it's that bad. Isn't it strange that the single gauge tab saves 55% on copper but isn't used on anything else but these voltage reg IC's LM317, 78xx. No thin tab DPAK or D2PAK out there. Hmmm. I find the thin tab warps if you aren't very careful with torque tightening the screw. Single gauge it's just garbage all round and the rants on EDN concur. |
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