| APM-TEC | Diameter (mm) | Height (mm) | Rated Voltage (Vp-p) | Max Voltage (Vp-p) | Resonance Frequency (Hz) | Minimum Sound Pressure Level (dBA) | CAPMacitance (pF) ± 30% | Housing Material | Termination |
| APM-PT21.809P | 21,8 | 11 | 9 | 30 | 2.500 | 82 at 10cm | 19000 ± 30% | Noryl | PIN |
