Found a chip that does *exactly* what I want. 😎
But it's WLCSP with over 30 balls spaced 0.4mm apart. 💀
But it's WLCSP with over 30 balls spaced 0.4mm apart. 💀
December 11, 2024 at 11:28 PM
Found a chip that does *exactly* what I want. 😎
But it's WLCSP with over 30 balls spaced 0.4mm apart. 💀
But it's WLCSP with over 30 balls spaced 0.4mm apart. 💀
also, here's a close-up of the markings on the tiny WLCSP between the BGA and QFN
April 11, 2026 at 9:10 PM
also, here's a close-up of the markings on the tiny WLCSP between the BGA and QFN
Hot take. 🔥 I feel WLCSP are actually easier than similar sized USON/DFNs. 🙃
December 11, 2024 at 11:52 AM
Hot take. 🔥 I feel WLCSP are actually easier than similar sized USON/DFNs. 🙃
WLCSP-Testsondenkopf-Marktbericht | In-Tiefenanalyse 2035 | WiseGuyReports www.wiseguyreports.com/de/reports/w...
WLCSP-Testsondenkopf-Marktbericht | In-Tiefenanalyse 2035
Der Markt für WLCSP-Testsondenköpfe wird voraussichtlich von 776.9 USD Million in 2025 auf 1,200 USD Million um 2035 wachsen. Der WLCSP-Testsondenkopfmarkt CAGR (Wachstumsrate) wird im Prognosezeitrau...
www.wiseguyreports.com
September 25, 2026 at 8:28 AM
WLCSP-Testsondenkopf-Marktbericht | In-Tiefenanalyse 2035 | WiseGuyReports www.wiseguyreports.com/de/reports/w...
decided the next thing to do would be to dump the presumed Winbond flash WLCSP
here it is mounted on a SOIC-8 pinout with a tiny bit of UV epoxy, like a particularly exotic dead bug
here it is mounted on a SOIC-8 pinout with a tiny bit of UV epoxy, like a particularly exotic dead bug
April 11, 2026 at 9:52 PM
decided the next thing to do would be to dump the presumed Winbond flash WLCSP
here it is mounted on a SOIC-8 pinout with a tiny bit of UV epoxy, like a particularly exotic dead bug
here it is mounted on a SOIC-8 pinout with a tiny bit of UV epoxy, like a particularly exotic dead bug
connected half of the pads
this is my first time soldering a 0.3mm pitch WLCSP, so it took me a bit to set up the workspace the way that makes it possible, but it's not too bad
this is my first time soldering a 0.3mm pitch WLCSP, so it took me a bit to set up the workspace the way that makes it possible, but it's not too bad
April 11, 2026 at 10:44 PM
connected half of the pads
this is my first time soldering a 0.3mm pitch WLCSP, so it took me a bit to set up the workspace the way that makes it possible, but it's not too bad
this is my first time soldering a 0.3mm pitch WLCSP, so it took me a bit to set up the workspace the way that makes it possible, but it's not too bad
If you've ever worried about prototyping with very small #smd parts like WLCSP, one easy "hack" is just using flux which avoids needing to paste it, relying on the solder balls. Obviously just for #prototyping, but it works surprisingly well with most BGAs! Just built some boards using this:
December 24, 2024 at 2:04 AM
If you've ever worried about prototyping with very small #smd parts like WLCSP, one easy "hack" is just using flux which avoids needing to paste it, relying on the solder balls. Obviously just for #prototyping, but it works surprisingly well with most BGAs! Just built some boards using this:
Now interestingly this chip variant - CKABD0 - does not appear in the official datasheet.
Package variant: CK (WLCSP)
Function variant: AB - not listed in the datasheet
Hardware revision: D
Production device identifier: 0
Likely that this version has enhanced AP protection 😭
Package variant: CK (WLCSP)
Function variant: AB - not listed in the datasheet
Hardware revision: D
Production device identifier: 0
Likely that this version has enhanced AP protection 😭
January 28, 2026 at 11:58 AM
Now interestingly this chip variant - CKABD0 - does not appear in the official datasheet.
Package variant: CK (WLCSP)
Function variant: AB - not listed in the datasheet
Hardware revision: D
Production device identifier: 0
Likely that this version has enhanced AP protection 😭
Package variant: CK (WLCSP)
Function variant: AB - not listed in the datasheet
Hardware revision: D
Production device identifier: 0
Likely that this version has enhanced AP protection 😭
WLCSP is the #ASIC terminology of the week!
In the last month, WLCSP has been the 20th most popular out of 42 terms.
In the last month, WLCSP has been the 20th most popular out of 42 terms.
WLCSP
WLCSP is the ASIC terminology of the week!
www.zerotoasiccourse.com
April 6, 2026 at 7:20 PM
WLCSP is the #ASIC terminology of the week!
In the last month, WLCSP has been the 20th most popular out of 42 terms.
In the last month, WLCSP has been the 20th most popular out of 42 terms.
biblically accurate WLCSP @CursedFootprint
February 3, 2026 at 6:29 AM
biblically accurate WLCSP @CursedFootprint
Naked silicon (specifically, WLCSP) isn’t “bad” per se; it’s heavily used in mobile phones.
The thing is…phones are usually sealed. The Pi is an exposed development board.
Don't blame the engineers too hard, Apple actually had a similar issue with the iPhone 4.
The thing is…phones are usually sealed. The Pi is an exposed development board.
Don't blame the engineers too hard, Apple actually had a similar issue with the iPhone 4.
February 12, 2026 at 6:12 PM
Naked silicon (specifically, WLCSP) isn’t “bad” per se; it’s heavily used in mobile phones.
The thing is…phones are usually sealed. The Pi is an exposed development board.
Don't blame the engineers too hard, Apple actually had a similar issue with the iPhone 4.
The thing is…phones are usually sealed. The Pi is an exposed development board.
Don't blame the engineers too hard, Apple actually had a similar issue with the iPhone 4.
ルネサス－大幅続伸 「GreenPAK」を拡充しWLCSPを採用した「SLG46801」のサンプル出荷開始
September 24, 2026 at 5:35 AM
ルネサス－大幅続伸 「GreenPAK」を拡充しWLCSPを採用した「SLG46801」のサンプル出荷開始
WLCSP is the #ASIC terminology of the week!
In the last month, WLCSP has been the 23rd most popular out of 42 terms.
In the last month, WLCSP has been the 23rd most popular out of 42 terms.
WLCSP
WLCSP is the ASIC terminology of the week!
www.zerotoasiccourse.com
April 7, 2025 at 7:00 PM
WLCSP is the #ASIC terminology of the week!
In the last month, WLCSP has been the 23rd most popular out of 42 terms.
In the last month, WLCSP has been the 23rd most popular out of 42 terms.
Успешно перепаял чип wlcsp размером 1.5х1.5 мм 🥳
December 23, 2023 at 8:15 PM
Успешно перепаял чип wlcsp размером 1.5х1.5 мм 🥳
sketching out an idea for a *good* USB audio dongle based on the TI TAD5242 and an WLCSP package STM32F411.
Should be able to fit everything on a pcb the size of an 3.5mm jack+usb port :D plenty of space left for caps, crystals, power etc.
Should be able to fit everything on a pcb the size of an 3.5mm jack+usb port :D plenty of space left for caps, crystals, power etc.
August 11, 2025 at 10:14 AM
sketching out an idea for a *good* USB audio dongle based on the TI TAD5242 and an WLCSP package STM32F411.
Should be able to fit everything on a pcb the size of an 3.5mm jack+usb port :D plenty of space left for caps, crystals, power etc.
Should be able to fit everything on a pcb the size of an 3.5mm jack+usb port :D plenty of space left for caps, crystals, power etc.
When Nordic makes a wlcsp mcu, probably, for Logitech.
March 8, 2025 at 3:13 AM
When Nordic makes a wlcsp mcu, probably, for Logitech.
Hell yeah :D TIL the STM32F411 has a wlcsp package.
It's an older part, and the STM32F4 sure has some quirky errata, but it's pretty well supported by embassy-stm32. I'm definitely interested in following along :D
It's an older part, and the STM32F4 sure has some quirky errata, but it's pretty well supported by embassy-stm32. I'm definitely interested in following along :D
August 11, 2025 at 10:57 AM
Hell yeah :D TIL the STM32F411 has a wlcsp package.
It's an older part, and the STM32F4 sure has some quirky errata, but it's pretty well supported by embassy-stm32. I'm definitely interested in following along :D
It's an older part, and the STM32F4 sure has some quirky errata, but it's pretty well supported by embassy-stm32. I'm definitely interested in following along :D
Also be careful with WLCSP, it's sensitive to light! Make sure you plan on building a housing for it, ambient light, and especially bright lights/flash bulbs can cause problems.
Okay no more unsolicited advice, but always happy to chat if you do want opinions :D
Okay no more unsolicited advice, but always happy to chat if you do want opinions :D
August 11, 2025 at 11:00 AM
Also be careful with WLCSP, it's sensitive to light! Make sure you plan on building a housing for it, ambient light, and especially bright lights/flash bulbs can cause problems.
Okay no more unsolicited advice, but always happy to chat if you do want opinions :D
Okay no more unsolicited advice, but always happy to chat if you do want opinions :D
I'm looking for candidates for this switch. Its been puzzling me.
Its a WLCSP-4 package, switching voltages of around 30Vpp and less than 150mA of current. It drives a charging coil at 6.8Mhz, rise times of roughly 20ns.
Its about 0.9x0.9x0.6mm ex. bumps, tall boi!
Could it be a GaN transistor?
Its a WLCSP-4 package, switching voltages of around 30Vpp and less than 150mA of current. It drives a charging coil at 6.8Mhz, rise times of roughly 20ns.
Its about 0.9x0.9x0.6mm ex. bumps, tall boi!
Could it be a GaN transistor?
November 12, 2024 at 2:18 PM
I'm looking for candidates for this switch. Its been puzzling me.
Its a WLCSP-4 package, switching voltages of around 30Vpp and less than 150mA of current. It drives a charging coil at 6.8Mhz, rise times of roughly 20ns.
Its about 0.9x0.9x0.6mm ex. bumps, tall boi!
Could it be a GaN transistor?
Its a WLCSP-4 package, switching voltages of around 30Vpp and less than 150mA of current. It drives a charging coil at 6.8Mhz, rise times of roughly 20ns.
Its about 0.9x0.9x0.6mm ex. bumps, tall boi!
Could it be a GaN transistor?
yeah it's great! I was waiting for you to comment on this thread :D
have you been impressed by the WLCSP work?
have you been impressed by the WLCSP work?
April 12, 2026 at 4:22 AM
yeah it's great! I was waiting for you to comment on this thread :D
have you been impressed by the WLCSP work?
have you been impressed by the WLCSP work?
It's really cool that you can just look at WLCSP ICs like looking through a piece of glass, no de-capping involved.
Got some ~1000nm NIR LEDs from @bunnie.org at 39C3.
Not really for security research in my case, I just like looking at ICs because its cool.
This is a ~1.6x1.6mm Azoteq captouch IC.
Got some ~1000nm NIR LEDs from @bunnie.org at 39C3.
Not really for security research in my case, I just like looking at ICs because its cool.
This is a ~1.6x1.6mm Azoteq captouch IC.
January 3, 2026 at 12:07 AM
It's really cool that you can just look at WLCSP ICs like looking through a piece of glass, no de-capping involved.
Got some ~1000nm NIR LEDs from @bunnie.org at 39C3.
Not really for security research in my case, I just like looking at ICs because its cool.
This is a ~1.6x1.6mm Azoteq captouch IC.
Got some ~1000nm NIR LEDs from @bunnie.org at 39C3.
Not really for security research in my case, I just like looking at ICs because its cool.
This is a ~1.6x1.6mm Azoteq captouch IC.
WLCSP, I've found, are more scary as an idea than in practice.
December 12, 2024 at 3:15 AM
WLCSP, I've found, are more scary as an idea than in practice.
Single inductor for 4 buck-boost regulators?
I know for sure that the MAX77655 will be my nearest EASY demo for the Hardware Design Series. Despite the fact that the package is the WLCSP with the 0.5 mm pitch.
Have you ever used the SIMO converters?
I know for sure that the MAX77655 will be my nearest EASY demo for the Hardware Design Series. Despite the fact that the package is the WLCSP with the 0.5 mm pitch.
Have you ever used the SIMO converters?
May 9, 2025 at 10:56 AM
Single inductor for 4 buck-boost regulators?
I know for sure that the MAX77655 will be my nearest EASY demo for the Hardware Design Series. Despite the fact that the package is the WLCSP with the 0.5 mm pitch.
Have you ever used the SIMO converters?
I know for sure that the MAX77655 will be my nearest EASY demo for the Hardware Design Series. Despite the fact that the package is the WLCSP with the 0.5 mm pitch.
Have you ever used the SIMO converters?