hardware

TL331LV

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by barrett-land

TL331LV - single low-voltage comparator, SOT-23-5, with REVERSED input pinout (IN- = pin 1, IN+ = pin 3). Canonical adom-lbr JSON + KiCad symbol/footprint/3D. Used on the USB3-to-Ethernet Data-Only Molecule.

componentictl331lvcomparatoradom-lbrusb3-ethernet-molecule
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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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TL331LV

Comparator · package Package_TO_SOT_SMD:SOT-23-5_HandSoldering · MPN TL331LV · Texas Instruments

Used on the USB3 to Ethernet (Data Only) Molecule board as 1x (U2), driving the HD3SS3212 USB-C orientation mux.

Ships the KiCad symbol, footprint, STEP + GLB 3D model, and the canonical adom-lbr JSON (one-command conversion to KiCad, native Altium, or EAGLE/Fusion).

⚠️ Reversed input pinout

The TL331LV deliberately reverses its inputs relative to the common SOT-23-5 comparator pinout. TI flags this on the datasheet pin diagram: "Note reversed inputs compared to similar common pinout."

Pin TL331LV LMV331 (common pinout)
1 IN− IN+
2 GND GND
3 IN+ IN−
4 OUT OUT
5 V_CC V_CC

Only the inputs differ: GND, OUT and V_CC are identical. That makes the two parts mechanically interchangeable drop-ins whose comparator polarity is opposite, so an unintended substitution silently inverts the decision and still passes AOI.

Used deliberately here: fitting the TL331LV in an LMV331 footprint inverts the CC1/CC2 orientation decision with zero layout change, which is how the molecule's USB-C orientation detection was corrected.

Pinout as shipped

1 IN-    input
2 V-     power_in
3 IN+    input
4 OUT    output
5 V+     power_in