8b252 smd code SOT89

Semiconductor
1

could someone help me to indentifY this chip, as i know pine1 output “maybe”, pine2 gnd, pine3 input (24v) it’s on motherboard brand THYSEN ref: UBA2-CMC4+

8b252 sot89
8b252 sot89584×1080 27.8 KB

Add images

ON SIT
ON SIT765×1020 110 KB

2

Hello sar001us,

Welcome to the DigiKey TechForum.

I’m sorry but I was not able to ID that chip. Looks like a voltage regulator at first glance or a transistor but there are no results for anything with that marking of 8B252. SOT89 package looks to be right but there are more than a few options of different ICs within that package.

Sorry for the inconvenience. Perhaps some other tech, or contributor might recognize this SMD IC it with that marking.

1 Like
3

Hi sar001us ,

If it offers any assistance, this is a surface mount TO-243AA package, sometimes known as SOT-89-3, 3-HSIP, PW-MINI, and SC-62. Easily identified by having 3 “flat leads” and a tab. The tab allows heat dissipation to the board.

Clicking above link will provide all the component types within that package DigiKey carries, unfortunately there is no way to search based on part markings other than manually searching within each datasheet. Performing an analysis of the circuit and parts around the component may steer you in the right direction of what kind of component this would be.

Resources:
Common Electronic Component Package Types
PCB Markings: Reference Designator Meanings (Part Identification)

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4

20241114_133434
20241114_1334341920×2560 677 KB

Hola.
Tengo un problema ,la imagen que subo es de una placa que funciona ,he comprobado las tensiones del regulador y en la primera patilla me da 20v, el la segunda 0v y en la tercera 24v.
Estoy reparando una como esa y en el regulador me salen en la primera patilla 10v, en la segunda 0v y el la tercera 24v. Yo creo que la avería podría estar en que no me llegan los 20v en la primera.
Si alguien me puede ayudar.

5

Hello! Hopefully there’s a spanish-speaking member of the forum who can look at this, but if not you can send your question to spanish.support@digikey.com to have it translated and sent to the technicians for assistance.

6

@noelia_lopez_9,

Traducción por ChapGPT 4o

Hola,

No puedo localizar el IC 8B630. Sin embargo, dado tu descripción, podemos suponer que se trata de un regulador lineal de 20 VDC con los pines:

  1. salida
  2. tierra
  3. entrada

Preguntas: ¿Está caliente el regulador?

Si es así, es probable que tengas una falla en algún lugar después del regulador. Recomendaciones:

  • sigue el circuito para ver qué está alimentando el regulador
  • busca otro componente caliente en la PCB
  • como último recurso, desuelda componentes que podrían estar sobrecargando la salida del regulador

Una vez más, estamos asumiendo que es un regulador lineal de 20 VDC. Esto puede no ser correcto, ya que 20 VDC no es común en circuitos.

Por favor, háznos saber lo que encuentres.

Saludos,

APDahlen

Translation by ChatGPT 4o

Hello

I am unable to locate the 8B630 IC. However, given your description, we can assume that this is a 20 VDC linear voltage regulator with pins:

  1. output

  2. ground

  3. input

Questions: Is the regulator hot?

If yes, you likely have a fault somewhere downstream of the regulator. Recommendations:

  • trace the circuit to see what the regulator is driving

  • look for another hot component on the PCB

  • as a last resort, unsolder components that could potentially load down the regulator’s output.

Once again, we are assuming that is a 20 VDC linear regulator. This may not be true as 20 VDC is not a common circuit.

Please let us know what you find.

Best wishes,

APDahlen

7

sar001us,

8B252, 8B630 - it is L78L18ACUTR (18V) from STMicroelectronics

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8

Thank you @Adam7,

That second the second symbol is a B.

I’ll go back and fix the post.

r/

APD