Siglent SDG 1025 schematic diagram (or what is the U63 chip)

[struijs]

Hi guys.

I am looking for the schematic diagram for the Siglent SDG 1025.
Or, does anybody knows what kind of IC the U63 is? The letters on top does not give a hit on Google.

Thanks in advance, Peter

[tautech]

Hi guys.

I am looking for the schematic diagram for the Siglent SDG 1025.
Or, does anybody knows what kind of IC the U63 is? The letters on top does not give a hit on Google.

Thanks in advance, Peter

Welcome to the forum.

Have a look and follow links here:
https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/

[tautech]

Here's a teardown thread of the SDG1010 that shows the same HW as SDG1025:
https://www.eevblog.com/forum/reviews/siglent-sdg1010-function-generator-teardown/

But where's U63 ?

Can you post a pic of your PCB ?

[struijs]

It is the IC close to the crystal.

Thanks for your topic link. But i can't find a schematic there.

Peter

[struijs]

This is the IC. Really no idea what it is.

[PA0PBZ]

Can you maybe post a picture where we can actually read what is on the ic?

[tautech]

There's some more pics here but sadly none of the region of interest:
https://www.eevblog.com/forum/testgear/siglent-sdg1025-arbitraryfunction-generator-under-some-tests/msg129024/#msg129024

[commongrounder]

I took a peek inside my SDG1005. It looks like U63 is a HC14, a hex schmidt trigger logic chip.

[struijs]

You are my hero!

Are there different versions of a HC14 or just one size fits all?

Thanks again.
Peter

[struijs]

With a little help from photoshop to enhance the letters.

[struijs]

It looks i have a HA14 or so.

Can you tell me exact whats written on yours please. All the letters.

Thanks for opening your device. Great service.

Peter

[struijs]

We are close guys. I have a better picture now.

commongrounder has a HC14, mine looks really like a HA14. Is there any difference?
And any idea where i can buy that HA14? Google is not my best friend in this.

I am from the netherlands.

[commongrounder]

HA14 and HC14 are both hex schmitt-trigger inverters. They have slightly different cmos characteristics, but function identically in most circuits. I’m guessing, due to this part’s proximity to the crystal, it functions as part of the 10Mhz time base oscillator. The other numbers on the chip are manufacturing and date codes, and will vary on a replacement part.
What specific problem are you having that has you looking at this chip?

[struijs]

HA14 and HC14 are both hex schmitt-trigger inverters. They have slightly different cmos characteristics, but function identically in most circuits. I’m guessing, due to this part’s proximity to the crystal, it functions as part of the 10Mhz time base oscillator. The other numbers on the chip are manufacturing and date codes, and will vary on a replacement part.
What specific problem are you having that has you looking at this chip?

I broke some legs. Don't ask me how....

So looking for a new one. You help me really a lot.

Now i have to find a reseller.

[PA0PBZ]

First find out what the package is:

http://www.ti.com/pdfs/logic/qfncompare.pdf

Then you know what you need to order:


Part          Marking  Package
SN74AHC14DBR  HA14     SSOP-14
SN74AHC14DGVR HA14     TVSOP-14
SN74AHC14PW   HA14     TSSOP-14

[struijs]

First find out what the package is:

http://www.ti.com/pdfs/logic/qfncompare.pdf

Then you know what you need to order:


Part          Marking  Package
SN74AHC14DBR  HA14     SSOP-14
SN74AHC14DGVR HA14     TVSOP-14
SN74AHC14PW   HA14     TSSOP-14

TSSOP i think, its a 14 pin.

[tautech]

First find out what the package is:

http://www.ti.com/pdfs/logic/qfncompare.pdf

Then you know what you need to order:


Part          Marking  Package
SN74AHC14DBR  HA14     SSOP-14
SN74AHC14DGVR HA14     TVSOP-14
SN74AHC14PW   HA14     TSSOP-14

TSSOP i think, its a 14 pin.

They are all 14 pin, check the package type by comparing all measurements.

[struijs]

First find out what the package is:

http://www.ti.com/pdfs/logic/qfncompare.pdf

Then you know what you need to order:


Part          Marking  Package
SN74AHC14DBR  HA14     SSOP-14
SN74AHC14DGVR HA14     TVSOP-14
SN74AHC14PW   HA14     TSSOP-14

Thank you. i ordered 20 (!!!!) at RS-components. Lucky me they were cheap. So if anybody need 19..... :-)

Peter

Fingers crossed.

[struijs]

First find out what the package is:

http://www.ti.com/pdfs/logic/qfncompare.pdf

Then you know what you need to order:


Part          Marking  Package
SN74AHC14DBR  HA14     SSOP-14
SN74AHC14DGVR HA14     TVSOP-14
SN74AHC14PW   HA14     TSSOP-14

TSSOP i think, its a 14 pin.

They are all 14 pin, check the package type by comparing all measurements.

Yes, my fault. Thank you guys that you help me so much.

Mine was exact 5mm, so its the TSSOP

Peter

[JohnPi]

While you have it open, you could upgrade the oscillator to a TCXO: https://www.eevblog.com/forum/repair/siglent-sdg1025-ribbon-cable-connector/msg1721600/#msg1721600

[struijs]

Hi Guys,

Thank you very much for all who helped.

I bought the HA14 IC and did some micro soldering.

The unit is working fine again including the TCXO modification.

Thanks again, Peter