edakit documentation

SparkFun Logic Level Converter

Why: the BSS138 level shifter sits on many maker boards that join 3.3 V and 5 V parts. It brings a circuit whose function is a level in both directions – each channel simulated, driven from either side –, which no reference circuit has, with real MOSFETs from their datasheet.

SparkFun Electronics, schematic Logic_Level_Bidirectional, design Patrick Alberts, Rev V01, dated 2013-09-26 – https://cdn.sparkfun.com/datasheets/BreakoutBoards/Logic_Level_Bidirectional.pdf (linked from the product page https://www.sparkfun.com/sparkfun-logic-level-converter-bi-directional.html), read on 2026-10-31. Released under the Creative Commons Attribution Share-Alike 3.0 License (the schematic's title block); this transcription keeps that licence. · SVG

Logic Level Converter sparkfun-logic-level-converter · board main graph v1.0 (2026-10-31) · 178 x 275 mm drawn by edakit schematic draw – change the graph, not this drawing JP1 PZ254V-11-06P JP2 PZ254V-11-06P LV1 LV1 LV1 LV2 LV2 LV2 LV LV LV LV LV HV1 HV1 HV HV HV HV HV HV2 HV2 LV3 HV3 HV3 LV4 HV4 HV4 1 2 3 4 5 6 JP1 PZ254V-11-06P 1 3 2 Q1 BSS138 R4 R3 1 3 2 Q3 BSS138 R10 R2 1 3 2 Q4 BSS138 R5 R1 1 3 2 Q2 BSS138 R7 R6 1 2 3 4 5 6 JP2 PZ254V-11-06P
StageCodeWhereJudgedWhy
checkDOCS.fileedakit.tomlcriterionThe transcription has no requirements file: what the published design must do stands in its own documents, not in edakit's form. edakit requires the file before a release (handbook 3.6); it is no point of the design.
checkPARTS.fact/reachC17414lacksA board that is sold names the SVHCs above 0.1 % (REACH Art. 33); the transcription took no supplier REACH statement for this part.
checkPARTS.fact/reachC492405lacksA board that is sold names the SVHCs above 0.1 % (REACH Art. 33); the transcription took no supplier REACH statement for this part.
checkPARTS.fact/reachC52895lacksA board that is sold names the SVHCs above 0.1 % (REACH Art. 33); the transcription took no supplier REACH statement for this part.
checkPARTS.fact/rohsC17414lacksA board that is sold states the RoHS status of every part it lists (RoHS 2011/65/EU); the transcription took none for this part.
checkPARTS.fact/rohsC492405lacksA board that is sold states the RoHS status of every part it lists (RoHS 2011/65/EU); the transcription took none for this part.
checkPARTS.fact/rohsC52895lacksA board that is sold states the RoHS status of every part it lists (RoHS 2011/65/EU); the transcription took none for this part.
simLIM.rangeQ1known gapLIM.range/gate (CK-4) finds the BSS138 half on at VGS 3.1 V: its RDS(on) is specified only at 4.5 V and 10 V. In this shifter the MOSFET carries the pull-up current (0.5 mA) and works half on by design; the rule does not weigh the current, so it warns where nothing burns. Kept: a gate drive of 1.8 V (the low side the shifter is also used with) would leave it barely on – a fact worth seeing.