Designed for the XClass, the second version of the Matek FCHUB-12S 440A PDB with 5/12V BEC has an 8pin JST-SH connector as well as a 1K:20K voltage divider.
PDB
Input voltage range: 8~60V (3~12S LiPo)
4x70A cont, 4x110A burst
4x ESC power /signal/ telemetry pads
Current Senor: 440A, 3.3V ADC, Scale 75
2x LED indicators for 5V, 12V
1K:20K voltage divider built-in
JST-SH 8pin connector
“V” pad: 12V or VBat voltage selectable
G: GND
Curr: current sensor signal
TLM: for BlHeli32 ESC telemetry
S1~S4: ESC signal
BEC 5V output (5V pad)
Voltage: 5.0 +/- 0.1VDC
Continuous current 5 Amps, Max.6A
Short-circuit tolerant (2 seconds)
Overcurrent protection & self-recovery
BEC 12V output (12V pad)
Voltage: 12.0 +/- 0.2VDC (Input voltage >=12V)
Continuous current 4 Amps, Max.5A
Input voltage<12V, Output voltage = Input voltage
Probably there is audible sound in the BEC12V inductor when Input voltage<12V