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| PartNumber | ECS-40-20-1 | ECS-40-20-19A-TR | ECS-40-18-4XEN |
| Description | Crystals 4MHz 20pF | Crystals CRYSTAL 4.0000MHZ 20PF SMD,ECX-19A, 50ppm, 30ppm,20pF,150 Ohm,Fundamental,-10 C ~ 70 C,2-SMD,0.433" L x 0.197" W (11.00mm x 5.00mm),0.079" (2.00mm) | Crystals 4MHz 18pF -10C +70C |
| Manufacturer | ECS | ECS | ECS |
| Product Category | Crystals | Crystals | Crystals |
| RoHS | N | - | Y |
| Termination Style | Radial | SMD/SMT | Radial |
| Load Capacitance | 20 pF | 20 pF | 18 pF |
| Frequency | 4 MHz | 4 MHz | 4 MHz |
| Tolerance | 30 PPM | 30 PPM | 30 PPM |
| Frequency Stability | 50 PPM | 50 PPM | 50 PPM |
| ESR | 100 Ohms | 150 Ohms | 150 Ohms |
| Drive Level | 1 mW | 100 uW | 500 uW |
| Minimum Operating Temperature | - 10 C | - 10 C | - 40 C |
| Maximum Operating Temperature | + 70 C | + 70 C | + 85 C |
| Length | 11.35 mm | 11 mm | 11.35 mm |
| Width | 4.65 mm | 5 mm | 4.65 mm |
| Height | 13.46 mm | 2 mm | 3.5 mm |
| Series | HC49U | ECX-19A | HCS-49USX |
| Product | Crystals | Crystals | Crystals |
| Type | Quartz Crystal | SMD Quartz Crystal | Quartz Crystal |
| Brand | ECS | ECS | ECS |
| Mounting Style | Through Hole | SMD/SMT | Through Hole |
| Lead Spacing | 4.88 mm | - | 4.88 mm |
| Product Type | Crystals | Crystals | Crystals |
| Factory Pack Quantity | 100 | - | 200 |
| Subcategory | Crystals | Crystals | Crystals |
| Packaging | - | Reel | Bulk |
| Package / Case | - | - | HC-49/US |