Naming Convention Example SOT23

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   In the document:Guidelines taken from IPC-7351 Footprint Expert Land Pattern Naming Convention;
the SOT23 naming convention is this: 

SOT23 .........SOT23 - Pin Qty. + P Pitch _ Lead Span X Body Height + L Lead Length

but in the SW PCB expert (I'm using the demo version) the example of a SOT23 component (part number REF3318AIDCKT) is the following: 

SOT23-3P65_210X110L36X22

I don't understand the meaning of the 4 last digits (36X22)

I imagine that 36 takes reference to L Lead Length and 22 to Lead Width, but in the datasheet these two values are different: 

Lead Length range is: 0.20 - 0.60
Lead Width range is: 0.30 - 0.50

so I don't understand why in the SW the final digits are (36X22)
I'm missing something or there is other rule for the naming convention that I'm not following?

Best Regards

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vdamico7 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 06 Aug 2024 Status: Offline Points: 3	Post Options Post Reply Quote vdamico7 Report Post Thanks(0) Quote Reply Topic: Naming Convention Example SOT23 Posted: 07 Aug 2024 at 1:50am
	In the document: Guidelines taken from IPC-7351 Footprint Expert Land Pattern Naming Convention; the SOT23 naming convention is this: SOT23 .........SOT23 - Pin Qty. + P Pitch _ Lead Span X Body Height + L Lead Length but in the SW PCB expert (I'm using the demo version) the example of a SOT23 component (part number REF3318AIDCKT) is the following: SOT23-3P65_210X110L36X22 I don't understand the meaning of the 4 last digits (36X22) I imagine that 36 takes reference to L Lead Length and 22 to Lead Width, but in the datasheet these two values are different: Lead Length range is: 0.20 - 0.60 Lead Width range is: 0.30 - 0.50 so I don't understand why in the SW the final digits are (36X22) I'm missing something or there is other rule for the naming convention that I'm not following? Best Regards



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 07 Aug 2024 at 7:15am
	The L dimensions are Nominal. Here is the datasheet for the TI Case Code DCK0003A
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vdamico7 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 06 Aug 2024 Status: Offline Points: 3	Post Options Post Reply Quote vdamico7 Report Post Thanks(0) Quote Reply Posted: 07 Aug 2024 at 8:15am
	Ok ok, the difference is that you are seeing the measures of SOT-SC70 and I'm seeing the measures of SOT-23 in the datasheet. I saw that the PN details, in reality, the REF3318AIDCKT is a SOT-SC70. At first, I saw the SOT-23 indications directly on the datasheet, because the physical description in the SW of the part number indicates an SOT-23. Thanks!!