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π131U31

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2Pai Semi Digital Isolators, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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π131U31

2Pai Semi · Digital Isolators · SOIC-16

π131U31 from 2Pai Semi, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VDD1 power_in Primary-side (VDD1) supply of the isolator, 3 V to 5.5 V recommended operating range, bypassed to GND1 with a 0.1 uF to 10 uF low-ESR ceramic capacitor.
2 GND1 power_in Ground reference for the primary-side VDD1 supply.
3 VIA input Channel A input on the VDD1 side, with logic thresholds of 0.7VDD1 (high) and 0.3VDD1 (low) at the recommended levels.
4 VIB input Channel B input on the VDD1 side, with logic thresholds of 0.7VDD1 (high) and 0.3VDD1 (low) at the recommended levels.
5 VOC output Channel C output on the VDD1 side (reverse channel from VIC), with 6 mA maximum recommended output current.
6 NC unconnected No connect pin (datasheet: empty pin).
7 NC unconnected No connect pin; on the π131U3X device this pin is empty (it is the EN1 output enable only on π131U6X).
8 GND1 power_in Ground reference for the primary-side VDD1 supply.
9 GND2 power_in Ground reference for the secondary-side VDD2 supply.
10 NC unconnected No connect pin; on the π131U3X device this pin is empty (it is the EN2 output enable only on π131U6X).
11 NC unconnected No connect pin (datasheet: empty pin).
12 VIC input Channel C input on the VDD2 side, with logic thresholds of 0.7VDD2 (high) and 0.3VDD2 (low) at the recommended levels.
13 VOB output Channel B output on the VDD2 side, with 6 mA maximum recommended output current.
14 VOA output Channel A output on the VDD2 side, with 6 mA maximum recommended output current.
15 GND2 power_in Ground reference for the secondary-side VDD2 supply.
16 VDD2 power_in Secondary-side (VDD2) supply of the isolator, 3 V to 5.5 V recommended operating range, bypassed to GND2 with a 0.1 uF to 10 uF low-ESR ceramic capacitor.

Key specifications

Parameter Value
Manufacturer 2Pai Semi
Package SOIC-16
Category Interface ICs
Pins 16

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage VDDx -0.5 7 V VDD1-GND1, VDD2-GND2, TA = 25°C 3
Input signal voltage (VIA, VIB) -0.5 V Max printed as VDDx + 0.5 V 3
Output voltage (VOA, VOB) -0.5 V Max printed as VDDx + 0.5 V 3
Primary side average output current per channel IO1 -10 10 mA 3
Secondary side average output current per channel IO2 -10 10 mA 3
Common-mode transient immunity CMTI -300 300 kV/µs 3
Storage temperature TST -65 150 °C 3
Operating ambient temperature TA -40 125 °C 3
Supply voltage VDDx 3 5.5 V 3
Output current, output high IOH -6 mA 3
Output current, output low IOL 6 mA 3
Communication rate 0 150 kbps 3
Junction temperature TJ -40 150 °C 3
Ambient temperature TA -40 125 °C 3
Output low voltage VOL 0 0.1 V 20 µA output current 5
Output low voltage VOL 0.1 0.2 V 2 mA output current 5
Input current per channel IIN -10 0.5 10 µA 0 V ≤ signal voltage ≤ VDDx 5
VDDx undervoltage threshold, rising VDDxUV+ 2.45 2.75 2.95 V 5
VDDx undervoltage threshold, falling VDDxUV− 2.3 2.6 2.75 V 5
VDDx undervoltage hysteresis VDDxUVH 0.15 V 5
Quiescent supply current IDD1 IDD1 (Q) 0.56 0.7 0.9 mA 5VDC, input low 0V, CL = 0pF 6
Quiescent supply current IDD2 IDD2 (Q) 0.85 1.06 1.38 mA 5VDC, input low 0V, CL = 0pF 6
Quiescent supply current IDD1 IDD1 (Q) 0.49 0.61 0.79 mA 5VDC, input high 5V, CL = 0pF 6
Quiescent supply current IDD2 IDD2 (Q) 0.85 1.07 1.39 mA 5VDC, input high 5V, CL = 0pF 6
Quiescent supply current IDD1 IDD1 (Q) 0.51 0.63 0.82 mA 3.3VDC, input low 0V, CL = 0pF 6
Quiescent supply current IDD2 IDD2 (Q) 0.81 1.01 1.32 mA 3.3VDC, input low 0V, CL = 0pF 6
Quiescent supply current IDD1 IDD1 (Q) 0.48 0.61 0.79 mA 3.3VDC, input high 3.3V, CL = 0pF 6
Quiescent supply current IDD2 IDD2 (Q) 0.84 1.05 1.37 mA 3.3VDC, input high 3.3V, CL = 0pF 6
Supply current IDD1 at 150kbps IDD1 0.62 0.93 mA 5VDC, 150kbps, CL = 0pF 6
Supply current IDD2 at 150kbps IDD2 1.09 1.64 mA 5VDC, 150kbps, CL = 0pF 6
Supply current IDD1 at 150kbps IDD1 0.57 0.86 mA 3.3VDC, 150kbps, CL = 0pF 6
Supply current IDD2 at 150kbps IDD2 1.07 1.61 mA 3.3VDC, 150kbps, CL = 0pF 6
Rated isolation voltage 3000 Vrms 1 minute continuous 7
IC junction-to-air thermal resistance θJA 100 °C/W Thermocouple at center of package underside 7

CAD (KiCad official)

  • Symbol: π131U31
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: 131u31-etched.step / 131u31-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 131u31.step / 131u31.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: 2Pai Semi datasheet (18 pp, sha256 d3202c14b062facd, retrieved 2026-10-22, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF