Replace BQ24781 with BQ24780?

[Antonynl]

Can I replace a BQ24781 with a BQ24780?

I can't find a datasheet on the BQ24781 by the way.


Thanks!

[R_J]

Re: Replace BQ24781 with BQ24780?

I found this https://e2e.ti.com/support/power-man...81-description
Information from the TI forum:

They are family parts, with minor difference on the switching frequency. BQ24781 supports 300kHz/400kHz lower switching frequency options. For your information, BQ24800 has better accuracy and improved performance.

BQ24781 datasheet is not available online. Please use BQ24780S. They have the same SMBUS address, default values and options.

Not sure if this is helpful or not.

[mcplslg123]

Re: Replace BQ24781 with BQ24780?

Yes, BQ24780 can be replaced with BQ24781 but if it has "S" suffix(Like BQ24780S) then it has to be replaced with same suffix.

[Antonynl]

Re: Replace BQ24781 with BQ24780?

Ok thank you.

What is the significance of the "S" suffix by the way?

[mcplslg123]

Re: Replace BQ24781 with BQ24780?

https://www.badcaps.net/forum/showthread.php?t=74599

follow this thread. there a table is listed about the difference by "bluemidnight"

[dutchgaucho]

Re: Replace BQ24781 with BQ24780?

For whom this might be of interest: just replaced BQ24781 successfully by a BQ24780s on an Asus TP412UA. Thanks guys!

[samick]

Re: Replace BQ24781 with BQ24780?

I have an Acer Aspire A515-43 that would not charge the battery. Acts like power cord is being unplugged & plugged. Also, if running only on AC and laptop is powered on, if battery is plugged in, system powers off without warning after a couple seconds.
I replaced the charge controller BQ24781 with a BQ24780s and it now charges the battery.

[J#26]

Re: Replace BQ24781 with BQ24780?

Thanks for this INFO
..cant find BQ24781..

[mon2]

Re: Replace BQ24781 with BQ24780?

US $3.76 18%OFF | (1piece) 100% New BQ24781RUYR BQ24781 QFN-28 Chipset
https://a.aliexpress.com/_mscjb28

[m3zharan]

Re: Replace BQ24781 with BQ24780?

thaks for the informetion. im also finding a bq24781

[junior_desampa]

Re: Replace BQ24781 with BQ24780?

I have an Acer Aspire A515-43 that would not charge the battery. Acts like power cord is being unplugged & plugged. Also, if running only on AC and laptop is powered on, if battery is plugged in, system powers off without warning after a couple seconds.
I replaced the charge controller BQ24781 with a BQ24780s and it now charges the battery.

Same thing here on the Acer a315.. but the customer's battery seems to have a problem.. still need to check

[mon2]

Re: Replace BQ24781 with BQ24780?

Check the voltage to ground of each pin on the battery connector. Need to be sure the smbus lines are not shorted due to an ESD transient event. Check the SCL and SDA pins.

[REpairAT]

Re: Replace BQ24781 with BQ24780?

Can confirm, it's also compatible the other way around. Just replaced BQ24780S with BQ24781.

[tomodachi]

Can also confirm. Just replaced BQ24781 with BQ24780s and it worked.

[DonRusak]

Ordered a BQ24780 and they sent me a BAA78C. Are these the same / interchangable? The BAA78C seems smaller and would obviously cause troubles when being replaced.

[tomodachi]

Ordered a BQ24780 and they sent me a BAA78C. Are these the same / interchangable? The BAA78C seems smaller and would obviously cause troubles when being replaced.

if there is doubt do not use it