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| PartNumber | PLD-21N30PQ | PLD-20A35EWQ | PLD-21A29WQ |
| Description | Audio Indicators & Alerts CONSTANT/SLOW PULSE 3-28VDC, 80DB, 24X10 | Audio Indicators & Alerts CONSTANT/SLOW PULSE 3.5KHZ, 95DB, 28X25 | Audio Indicators & Alerts CONSTANT/SLOW PULSE 3-24VDC, 85DB, 24X14 |
| Manufacturer | Mallory Sonalert | Mallory Sonalert | Mallory Sonalert |
| Product Category | Audio Indicators & Alerts | Audio Indicators & Alerts | Audio Indicators & Alerts |
| RoHS | Y | Y | Details |
| Product | Piezo Transducers | Buzzers | Indicators |
| Sound Pressure Level | 80 dBA | 95 dBA | 85 dBA |
| Tone | Continuous | Continuous | Continuous |
| Frequency | 3 kHz | 3.5 kHz | 2.7 kHz |
| Voltage Rating | 12 V | 12 V | 5 VDC |
| Current Rating | 12 mA | 10 mA | 30 mA |
| Termination Style | Solder Pin | Wire Leads | Gullwing Lead |
| IP Rating | - | - | - |
| Mounting | Through Hole | Flange | SMD/SMT |
| Length | 24 mm | 28 mm | 9 mm |
| Series | PLD | PLD | ASI |
| Brand | Mallory Sonalert | Mallory Sonalert | Mallory Sonalert |
| Length in | 0.945 in | - | 0.374 in |
| Length mm | 24 mm | - | 9.5 mm |
| Product Type | Audio Indicators & Alerts | Audio Indicators & Alerts | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Audio Devices | Audio Devices | - |
| Diameter | - | 28 mm | - |
| Dimensions | - | 28 mm L x 28 mm W x 25 mm H | 9 mm L x 9 mm W x 5.5 mm H |
| Height | - | 25 mm | 5.5 mm |
| Width | - | 28 mm | 9 mm |
| Height in | - | 0.984 in | - |
| Height mm | - | 25 mm | - |
| Unit Weight | - | 0.352740 oz | 0.088185 oz |
| Packaging | - | - | Reel |
| Width in | - | - | 0.374 in |
| Width mm | - | - | 9.5 mm |