low-cost opamps in sot-23

W

Winfield Hill

Guest
I have received a respectable 2SK3018 MOSFET,
made by Jiangsu Changjiang, from LCSC, only
$0.0133 each. Now I'm looking for a low-cost
opamp to go with it. Found the TP09, a 6MHz
dual, from 3Peak, Vos 400uV, $0.06 each, looks
fine, but would like a single type in a SOT-23
package. Picky, picky, picky!

Ah, the LMV321 in SOT-23-5, in stock at LCSC:
TI: $0.0735, Diodes: $0.077, 3Peak: $0.05,
Gainsil: $0.03. Or in SC-70, 3Peak: $0.059.
So slow, only 1MHz. LMV321TP 1.3MHz upgrade.

Hey, 4MHz TP2262 by 3Peak, $0.132, but dual
in sop8. Wait, sot-23 TP2261, oops, no stock.


--
Thanks,
- Win
 
Winfield Hill wrote...
I have received a respectable 2SK3018 MOSFET,
made by Jiangsu Changjiang, from LCSC, only
$0.0133 each. Now I'm looking for a low-cost
opamp to go with it. Found the TP09, a 6MHz
dual, from 3Peak, Vos 400uV, $0.06 each, looks
fine, but would like a single type in a SOT-23
package. Picky, picky, picky!
Click to expand...

I'm impressed with 3Peak, cool designs, and
low prices! Their TP1561A is a single version
of the TP09 in sc70 $0.083 (sot-23 a bit more).
That's only $0.096 for opamp and MOSFET pair.


--
Thanks,
- Win
 
On 20/08/2019 14:15, Winfield Hill wrote:
Winfield Hill wrote...

I have received a respectable 2SK3018 MOSFET,
made by Jiangsu Changjiang, from LCSC, only
$0.0133 each. Now I'm looking for a low-cost
opamp to go with it. Found the TP09, a 6MHz
dual, from 3Peak, Vos 400uV, $0.06 each, looks
fine, but would like a single type in a SOT-23
package. Picky, picky, picky!

I'm impressed with 3Peak, cool designs, and
low prices! Their TP1561A is a single version
of the TP09 in sc70 $0.083 (sot-23 a bit more).
That's only $0.096 for opamp and MOSFET pair.
Click to expand...
Have you any experience of buying (small and multi reel quantities) from
LCSC ?

Certainly the prices look nice.

Thanks.

MK

---
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On 20 Aug 2019 06:15:24 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

>TP1561A

The really cheap amps are basically 5 volt parts. Is that enough gate
drive?
 
"Michael Kellett" <mk@mkesc.co.uk> wrote in message
news:mpOdnQXG8eUFlMHAnZ2dnUU78TvNnZ2d@giganews.com...
Have you any experience of buying (small and multi reel quantities) from
LCSC ?

Certainly the prices look nice.
Click to expand...

I don't have direct experience yet but I haven't heard anything bad about it
from others. AFAIK, they have some QC so it's not like buying crap off Ali
or eBay.

The tariffs going on right now stink, but it's still priced well below
DK/Mouser.

Tim

--
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Design
Website: https://www.seventransistorlabs.com/
 
On 20/08/2019 17:14, Tim Williams wrote:
"Michael Kellett" <mk@mkesc.co.uk> wrote in message
news:mpOdnQXG8eUFlMHAnZ2dnUU78TvNnZ2d@giganews.com...

Have you any experience of buying (small and multi reel quantities) from
LCSC ?

Certainly the prices look nice.

I don't have direct experience yet but I haven't heard anything bad
about it from others.  AFAIK, they have some QC so it's not like buying
crap off Ali or eBay.

The tariffs going on right now stink, but it's still priced well below
DK/Mouser.

Tim
Click to expand...
I'm in the UK - free trade with USA and China, here we come !
(I hope)

MK

---
This email has been checked for viruses by AVG.
https://www.avg.com
 
Michael Kellett wrote...
Winfield Hill wrote:
Winfield Hill wrote...

I have received a respectable 2SK3018 MOSFET,
made by Jiangsu Changjiang, from LCSC, only
$0.0133 each. Now I'm looking for a low-cost
opamp to go with it. Found the TP09, a 6MHz
dual, from 3Peak, Vos 400uV, $0.06 each, looks
fine, but would like a single type in a SOT-23
package. Picky, picky, picky!

I'm impressed with 3Peak, cool designs, and
low prices! Their TP1561A is a single version
of the TP09 in sc70 $0.083 (sot-23 a bit more).
That's only $0.096 for opamp and MOSFET pair.

Have you any experience of buying (small and
multi reel quantities) from LCSC?
Click to expand...

Yes, middle-level quantities, and a full reel
once. I've found them very well organized and
easy to work with. Sort of a Chinese Digi-Key.
Low-cost shipping. I've been using DHL.


--
Thanks,
- Win
 
jlarkin@highlandsniptechnology.com wrote...
Winfield Hill wrote:

TP1561A

The really cheap amps are basically 5 volt
parts. Is that enough gate drive?
Click to expand...

Yes, for modest currents. The 2SK3018 spec
is 7 ohms with 2.5-voltage gate drive, and
for linear operation Vgs = 2 volts at 25mA.
Ciss = 13pF at Vds = 5V. I was attracted to
the low capacitance. For higher currents,
one will need a bigger logic-level MOSFET,
and have to spend more than 1.3 cents. One
problem, I can't think of any applications
that really need the low cost. :eek:)


--
Thanks,
- Win
 
On Tuesday, August 20, 2019 at 1:38:15 PM UTC-4, Winfield Hill wrote:
jlarkin@highlandsniptechnology.com wrote...

Winfield Hill wrote:

TP1561A

The really cheap amps are basically 5 volt
parts. Is that enough gate drive?

Yes, for modest currents. The 2SK3018 spec
is 7 ohms with 2.5-voltage gate drive, and
for linear operation Vgs = 2 volts at 25mA.
Ciss = 13pF at Vds = 5V. I was attracted to
the low capacitance. For higher currents,
one will need a bigger logic-level MOSFET,
and have to spend more than 1.3 cents. One
problem, I can't think of any applications
that really need the low cost. :eek:)
Click to expand...

I can't think of any applications that need high cost. 8-o

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209
 
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