Where to Buy SL100 Transistor or Equivalent in the Philippines for Battery Charger Project

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#1 21659250 28 Jul 2011 00:21

Evelyn Benamir Evelyn Benamir

Anonymous

Post #1
21659250 28 Jul 2011 00:21

Greetings! Where can I buy sl100 transistor or its equivalent in the Philippines? My son needs this sl100 transistor to complete his mobile phone battery charger.
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#2 21659251 28 Jul 2011 06:46

Olin Lathrop Olin Lathrop

Anonymous

Post #2
21659251 28 Jul 2011 06:46

I don't know what a SL100 transistor is. Show the parameters you care about and there will likely be a common part that does what you need.
#3 21659252 28 Jul 2011 08:34

Praveen Kumar Avala Praveen Kumar Avala

Anonymous

Post #3
21659252 28 Jul 2011 08:34

sir,
you can find this in alldatasheets.com or findchips.com. once please visit the website that might me helpful.
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#4 21659253 28 Jul 2011 09:31

Olin Lathrop Olin Lathrop

Anonymous

Post #4
21659253 28 Jul 2011 09:31

No. I'm not going to chase down a datasheet for something you should be supplying information for. That's your responsibility.

Besides, a datasheet will tell me all the parameters of a part, not which ones you care about. Finding a substitute that meets or exceeds all parameters could be difficult. However, no design relies on the outer values of all parameters. Finding a substitute that meets your needs is likely a lot easier.
#5 21659254 28 Jul 2011 10:33

Cody Miller Cody Miller

Anonymous

Post #5
21659254 28 Jul 2011 10:33

I think that you have a typo in the part number. Where did you get that part number? Send a link or upload the schematic.
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#6 21659255 29 Jul 2011 16:53

David Deleonardo David Deleonardo

Anonymous

Post #6
21659255 29 Jul 2011 16:53

Olin:

I re-read the chain here and I think Praveen was advising the person that asked the question originally (Evelyn) to go to those sites to get the datasheets.

Still, your point is very well taken: without knowing what they care about, there is no way to really recommend "an equivalent".

Plus, as Cody M. points out in a subsequent post, I suspect there is a typo in the part number. Likely confused case markings with part number which are not always the same...
#7 21659256 29 Jul 2011 19:58

Olin Lathrop Olin Lathrop

Anonymous

Post #7
21659256 29 Jul 2011 19:58

Oh, I see that now. I didn't notice there were two different people. It didn't help that he addressed his comment to "sir", instead of "olin" or "Evelyn".

In any case, we still need to know what parameters of the transistor are required for the circuit. Most likely there are many possible substitutes, but without parameters it's hard to know.
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#8 21659257 29 Jul 2011 22:31

Praveen Kumar Avala Praveen Kumar Avala

Anonymous

Post #8
21659257 29 Jul 2011 22:31

David,
you were right, i was addressing "evelyn", to visit the website. thank u for solving the issue.
#9 21659258 30 Jul 2011 01:25

Evelyn Benamir Evelyn Benamir

Anonymous

Post #9
21659258 30 Jul 2011 01:25

Sir:

Follow-up to the transistor sl100. One of the reference of my son to his mobile phone project is http://www.electronicsforu.com/EFYLinux/circuit/mar2004/Cir-01-mobile-charger.pdf

Any replacement or alternate to sl100 transistor that can be bought in the Philippines to be used in his project will be greatly appreciated.

Thank you.
#10 21659259 30 Jul 2011 01:51

Dennis Bauer Dennis Bauer

Anonymous

Post #10
21659259 30 Jul 2011 01:51

How about the CL100? that seems the same, but the best way is just go to electronic parts seller and ask if they have something similar, because i don't know what is availlable in the Phillipines
#11 21659260 30 Jul 2011 07:28

Olin Lathrop Olin Lathrop

Anonymous

Post #11
21659260 30 Jul 2011 07:28

Just about any medium power NPN transistor will do there. This is not a demanding application. You want a package that can dissipate some heat, but it doesn't need to be excessive since the current it limited to 120mA. I keep TIP41 transistors around for such applications, but just about any NPN in a TO-220 package can do this job.
#12 21659261 30 Jul 2011 08:54

Alec Alec

Anonymous

Post #12
21659261 30 Jul 2011 08:54

Ah, TIP41 BJTs. Ubiquitous, versatile, and made by a half-dozen or more semiconductor manufacturers so you can pretty much always find some.

I fondly remember using them in college Electronics labs not so long ago as simple transistor signal amplifiers. And once for what turned out to be a very not LDO linear regulator (Vce saturation spec not so awesome for that application).

Although it looks like the Pb free monster is getting its claws on them and the manufacturers are going to stop shipping the old ones and now only do ones with lead free caveats in the part number. Oh well, I guess I can at least use that as an excuse for my ugly solder jobs.
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Topic summary

✨ The discussion centers on sourcing the SL100 transistor or an equivalent for a mobile phone battery charger project in the Philippines. Participants highlight the need for detailed transistor parameters to identify suitable substitutes, as the exact SL100 part number may be a typo or unclear. Suggested alternatives include common medium power NPN transistors in TO-220 packages, such as the TIP41, which can handle the required current (~120mA) and dissipate heat adequately. The CL100 transistor is also mentioned as a possible equivalent. Resources like alldatasheets.com and findchips.com are recommended for datasheet lookup. The consensus is that many general-purpose NPN transistors can fulfill the role, and local electronic parts sellers may offer suitable replacements.
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FAQ

TL;DR: For that phone-charger circuit, 120 mA is the design current, and “Just about any medium power NPN transistor will do.” [Elektroda, Olin Lathrop, post #21659260]

Why it matters: This FAQ helps hobbyists quickly choose and source a safe, workable SL100 replacement for a mobile phone battery charger in the Philippines and beyond.

Quick Facts

Design current: Approx. 120 mA; choose a package that can shed some heat. [Elektroda, Olin Lathrop, post #21659260]
Suitable drop-in class: Medium-power NPN, TO‑220 form factor (e.g., TIP41 family). [Elektroda, Olin Lathrop, post #21659260]
Part-number gotchas: Reported SL100 may be a typo or case-marking confusion. [Elektroda, David Deleonardo, post #21659255]
Where to look up parts: alldatasheet and findchips were suggested by contributors. [Elektroda, Praveen Kumar Avala, post #21659252]
Local sourcing tip: Ask shops for equivalents; CL100 was mentioned as a similar option. [Elektroda, Dennis Bauer, post #21659259]

What is the SL100 transistor, and is that part number correct?

Forum contributors suspected the “SL100” label might be a typo or a case-marking mix‑up. Before hunting parts, verify the schematic’s actual transistor requirements and part code. Cross‑checking the reference design or datasheet avoids buying the wrong device. When markings differ from full part numbers, sellers and catalogs can mislead. Confirm parameters first, then match with an equivalent, not the marking alone. [Elektroda, David Deleonardo, post #21659255]

What can I use instead of an SL100 in the EFY mobile charger?

Use a medium‑power NPN transistor that can dissipate modest heat. The charger limits current to about 120 mA, so the job is undemanding. A general‑purpose TO‑220 NPN works well here. TIP41 is a convenient choice kept by many builders for such roles. Select a heat‑capable package rather than tiny small‑signal devices. "Just about any medium power NPN transistor will do there." [Elektroda, Olin Lathrop, post #21659260]

Will a TIP41 work for this battery‑charger project?

Yes. TIP41 BJTs are common, versatile, and available from many manufacturers. That breadth helps sourcing in local markets. One contributor highlighted using TIP41s in labs and projects due to ubiquity. If you pick a TIP41, still confirm pinout and basic specs against your circuit. This avoids wiring errors and overheating. A note from experience: lead‑free variants are replacing older versions in many catalogs. [Elektroda, Alec, post #21659261]

Which parameters actually matter when choosing a substitute?

Focus on current handling, power dissipation, and package. The circuit’s current is limited to about 120 mA, so thermal needs are modest. Choose a package with some heat capacity, like TO‑220. Voltage ratings and gain should meet or exceed the design’s needs, but extremes are unnecessary here. Matching only the essential parameters keeps sourcing flexible and reliable. [Elektroda, Olin Lathrop, post #21659260]

Where can I find datasheets or check availability fast?

Use online aggregators mentioned by contributors: alldatasheet for specifications and findchips for distributor stock snapshots. These tools help confirm key parameters and identify stocking equivalents. Search by function and package if the original part number is unclear. Then shortlist available medium‑power NPNs for your region. [Elektroda, Praveen Kumar Avala, post #21659252]

Can a shop suggest an equivalent, like CL100, if SL100 isn’t available?

Yes. Bring your schematic and required specs. Local electronics sellers can propose close equivalents, such as CL100, that fit your application. This is practical when inventories differ across regions. Still verify the substitute’s pinout, package, and ratings before purchase. Ask for a quick datasheet printout or QR link to confirm. [Elektroda, Dennis Bauer, post #21659259]

How do I pick a substitute transistor quickly? (3‑step)

Note required current (~120 mA) and pick a heat‑capable package.
Choose a medium‑power NPN in TO‑220 (e.g., TIP41 class).
Verify voltage, gain, and pinout match your layout before soldering. [Elektroda, Olin Lathrop, post #21659260]

What happens if I drop in a small‑signal NPN instead?

Small‑signal packages lack thermal headroom. Even at 120 mA, they can overheat or fail during charging. The design benefits from a package that can dissipate some heat. Use a medium‑power device to keep junction temperatures reasonable and extend life. This prevents erratic charging or thermal shutdowns. [Elektroda, Olin Lathrop, post #21659260]

Why might TIP41 be a poor choice for a low‑dropout regulator build?

A contributor noted TIP41’s VCE(sat) is not ideal for very low‑dropout linear regulators. That edge case can cause excessive dropout and heat at low headroom. For LDO roles, select a transistor or regulator with lower saturation or use a dedicated LDO IC. “Vce saturation spec not so awesome for that application.” [Elektroda, Alec, post #21659261]

Do I really need to list every parameter to find an equivalent?

No. Designers rarely operate at every parameter’s limit. Identify which parameters your circuit truly uses, then meet or exceed those. This approach simplifies substitution while keeping the design safe. It also broadens your sourcing options when the exact part is missing. [Elektroda, Olin Lathrop, post #21659256]

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