LF357 substitute

[Qiaozhi]

Lt1055 est plus proche pour lf357n

Please make your posts in English.

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[kt315]

Lt1055 est plus proche pour lf357n

low Slew Rate 12V/µs Min. you have to have 50 slew rate on the board.

[Detectorist#1]

Hi KT315,
Are you sure - in detector with 40-160us first delay (according known time-diagrams for Delta Pulse), 50V/us will give different result in comparison with 12V/us for LF356 (still in production)?

[kt315]

LF356 are being also fake. But original one works just fine. i mean DP. i bought 357 on link given Emersonpaz and will inform you result.

[algan]

LF356 are being also fake. But original one works just fine. i mean DP. i bought 357 on link given Emersonpaz and will inform you result.

I personally didn't like these and I've bought them and to me they are fake. If you find one like the one in this picture, I think it's original, but yes, they have been discontinued.

[Detectorist#1]

Hi algan,
According to the label on the top, this part is manufactured in 16-th week of 1991 year (if the label is not fake). It will be more good if DIY peoples haves possibility to use contemporary parts.

[algan]

Hi GeoMax, I came across this by accident, but this store is in Germany and has LF357N. I think it is original, but until it is tested, it is impossible to say for sure.
https://elektronik-alles.de/LF357N/016931

[GeoMax]

Hello Algan,

I checked the website. It says it's old stock. But the price is also quite high.

[kt315]

I personally didn't like these and I've bought them and to me they are fake. If you find one like the one in this picture, I think it's original, but yes, they have been discontinued.

i had learned pics of 357s. and yes, i noted original one has cropped edges legs. is it a rule for all 357s or not i can not know but it is sure good sign of to be the original.

[Emersonpaz]

https://youtube.com/shorts/UNFWit6c4...ZOL-khAZ9Qclrz

[kt315]

take attention on the pics LF357 New Old stock - Geotech Forums (geotech1.com)

[kt315]

https://youtube.com/shorts/UNFWit6c4...ZOL-khAZ9Qclrz

thank you. my assumption, above, is right. the legs are cutted.

[Maurizio2]

Hi!
The LT1122 is a good choice.
Buy it from an authorized dealer.

[algan]

Hi!
The LT1122 is a good choice.
Buy it from an authorized dealer.

And you tested the LT1122 on some pulse metal detector like Delta Pulse2 or Polonaise Pi, tell me if it definitely works compared to the fake ones, is there a drastic difference in depth. It is not said that if the parameters are good, it will work.

[Detectorist#1]

The real substitution of LF357 for Delta Pulse MD is TLE2071CP with guaranteed work at input voltage equivalent to Vcc and with price of only 1.60Euro. Other parameters are 9.4MHz bandwidth and 35V/us slew rate.