Part Datasheet Audit
Worked for 13 mins 24 sec
Created a project doc
Completed the part review and created the detailed audit in BD9G341AEFJ-E2 Part Audit. The symbol pin numbers/names and 9-pad HTSOP-J8 footprint generally match the ROHM datasheet; key issues flagged are wrong indexed part type (
Transistors), missing explicit package property, unspecified pin types, missing pin descriptions, and an unconfirmed Datasheet URL update to the official ROHM PDF.Open items:
- Datasheet property still appeared indexed as the Mouser-hosted copy after the update attempt.
- Pin descriptions/types and part taxonomy should be cleaned up if you want this part library-ready.
Suggested next steps:
- Update part metadata: part type, package/case, and datasheet URL.
- Add datasheet-backed pin descriptions and pin types.
- Run a final footprint/3D alignment and DFM check against ROHM HTSOP-J8 land-pattern guidance.
Fix metadata and pins
Update part metadata
Add pin details
Check footprint DFM
Review ERC/DRC
Refine this doc
Ask about this doc
BD9G341AEFJ-E2 Part Audit
Date: 2026-07-21
Project: BD9G341AEFJ-E2
Sources used
- Current Flux part project metadata, schematic terminals, and footprint data.
- Current Flux indexed part data showed Datasheet URL:
https://www.mouser.com/ds/2/348/bd9g341aefj-e-760779.pdf. - Official ROHM product page:
https://www.rohm.com/products/power-management/switching-regulators/buck-step-down/integrated-fet-nonsynchronous/bd9g341aefj-product - Official ROHM datasheet PDF found during review:
https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator/bd9g341aefj-e.pdf - ROHM HTSOP-J8 package/thermal/stencil notes found for land-pattern context.
Available part information reviewed
Table
| Field | Flux/project value observed | Datasheet / ROHM check | Result |
|---|---|---|---|
| MPN | BD9G341AEFJ-E2 | Ordering code BD9G341AEFJ-E2; EFJ = HTSOP-J8; E2 = embossed tape/reel | Match |
| Manufacturer | Rohm / ROHM | ROHM Semiconductor | Match |
| Description | Project describes adjustable 3 A buck converter in HTSOP-J8 | 1ch buck converter integrated FET, 12 V to 76 V input, 3 A output | Match |
| Part type | Indexed as Transistors | Switching regulator / DC-DC buck converter PMIC | Mismatch |
| Package | Project description HTSOP-J8; footprint asset SOIC127P600X100-9N.kicad_mod | HTSOP-J8, 4.90 mm x 6.00 mm x 1.00 mm | Match in intent; package/case property not explicitly indexed |
| Pin/pad count | 9 terminals/pads: 8 leads + EP | Datasheet has pins 1-8 plus thermal pad connected to GND | Match |
| Datasheet URL | Existing indexed URL was Mouser-hosted copy | Official ROHM PDF found | Official source identified; property update could not be independently confirmed by indexed data |
Key datasheet specifications
- Function: non-synchronous 1-channel buck converter with integrated N-channel FET.
- Recommended input voltage: 12 V to 76 V.
- Maximum output current: 3 A.
- Integrated switch: 80 V / 3.5 A / 150 mOhm N-channel FET.
- Feedback/reference voltage: 1.000 V typ; +/-1.5% at 25 C; +/-2.0% over -40 C to +85 C.
- Oscillator range: 50 kHz to 750 kHz; 200 kHz typ with RT = 47 kOhm.
- EN behavior: shutdown below about 1.3 V; standby region 1.3 V to 2.4 V; operational above about 2.6 V; internal 10 uA source current.
- Standby current: 0 uA typ, 10 uA max at VEN = 0 V.
- Operating ambient temperature: -40 C to +85 C.
- Maximum junction temperature: 150 C.
- Protections: OCP, UVLO, TSD, OVP, soft-start.
- Thermal pad: connect to GND.
Pin cross-check
Table
| Pin | Flux terminal | Datasheet name | Datasheet description | Result |
|---|---|---|---|---|
| 1 | LX | LX | Switching node; place near Schottky barrier diode and inductor | Match |
| 2 | GND | GND | Ground pin; keep ground pattern away from high-current input-to-output capacitor path as recommended | Match |
| 3 | VC | VC | Error amplifier output; phase compensation connects from this pin to GND | Match |
| 4 | FB | FB | Feedback input; regulates to 1.0 V | Match |
| 5 | RT | RT | Oscillator frequency set pin; resistor to GND; recommended 50 kHz to 750 kHz | Match |
| 6 | EN | EN | Shutdown/UVLO enable pin with internal current source | Match |
| 7 | BST | BST | Bootstrap capacitor input; 0.1 uF ceramic capacitor to LX recommended | Match |
| 8 | VCC | VCC | Input supply voltage pin | Match |
| 9 | EP | Thermal Pad | Thermal pad; connect to GND | Match, but name differs from datasheet wording |
Symbol review
- Terminal names and pin numbers match the datasheet pin table.
- Symbol arrangement is readable: left side contains LX/GND/VC/FB and right side contains RT/EN/BST/VCC, with EP placed separately.
- All terminal
Pin Typevalues areUnspecified. - No detailed
Pin Descriptionvalues were found on the terminal properties.
Footprint review
Observed footprint asset:
SOIC127P600X100-9N.kicad_mod, description HTSOP-J8-4.Observed footprint geometry from the embedded KiCad module:
- Pads 1-8: SMD rectangles, 1.27 mm pitch, size 0.70 mm x 1.525 mm.
- Pad 9 / exposed pad: 2.4 mm x 3.2 mm.
- Pin 1-4 side and pin 5-8 side positions match the HTSOP-J8 top-view order.
- Fab outline is 3.9 mm x 4.9 mm with a pin-1 chamfer; this is consistent with an HTSOP-J8 body drawing while the ROHM package listing gives 4.90 mm x 6.00 mm x 1.00 mm overall package size.
- Courtyard is 7.45 mm x 5.50 mm.
- 3D model asset present:
BD9G341AEFJ-E2.stp.
Footprint result: generally consistent with ROHM HTSOP-J8 / 8-lead exposed-pad package. Minor note: ROHM package/thermal application-note examples show a 0.75 mm land width in some HTSOP-J8 drawings, while this footprint uses 0.70 mm pad width. That is a small land-pattern variant rather than a confirmed error; verify against the preferred ROHM recommended land pattern or assembler rules if this part will be published as an authoritative library footprint.
Mismatches / issues flagged
Part Typeis indexed asTransistors, but this device is a switching-regulator / DC-DC buck converter IC.- The
Package or Case Codeproperty was not explicitly indexed, even though the project/footprint clearly indicate HTSOP-J8. - Terminal
Pin Typevalues are allUnspecified; better pin typing would be useful for ERC and symbol quality. - Terminal
Pin Descriptionproperties are absent; datasheet-backed descriptions should be added for all pins. - Datasheet URL was already set, but to a Mouser-hosted copy. The official ROHM PDF was found; an update was attempted, but indexed project data still reported the Mouser URL afterward, so the update could not be independently confirmed.
Recommended cleanup
- Change part type from
Transistorsto a switching regulator / buck converter / power management IC category if the library taxonomy supports it. - Add explicit package/case property:
HTSOP-J8. - Add datasheet-backed pin descriptions for pins 1-8 and thermal pad.
- Assign more accurate pin types, e.g. LX = Power/Output/Switching, GND/EP = Ground, VC/FB/RT/EN/BST = Input/Analog/Control as appropriate for Flux conventions.
- If exact library-quality footprint validation is required, compare against ROHM’s preferred HTSOP-J8 land-pattern/stencil application notes and assembler DFM rules.
Sources used
Available part information reviewed
Key datasheet specifications
Pin cross-check
Symbol review
Footprint review
Mismatches / issues flagged
Recommended cleanup
