The SX1509IULTRT is a surface mount I/O expander from Semtech, packaged in a 28-pin QFN-UT EP non-lead-frame SMT package. It has a maximum package height of 0.58mm and a seated plane height of 0.6mm. The device is made of plastic and has a pin pitch of 0.4mm. It is designed for surface mount applications.
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| Basic Package Type | Non-Lead-Frame SMT |
| Package Family Name | QFN |
| Package/Case | QFN-UT EP |
| Lead Shape | No Lead |
| Pin Count | 28 |
| PCB | 28 |
| Package Length (mm) | 4 |
| Package Width (mm) | 4 |
| Package Height (mm) | 0.58(Max) |
| Seated Plane Height (mm) | 0.6(Max) |
| Pin Pitch (mm) | 0.4 |
| Package Material | Plastic |
| Mounting | Surface Mount |
| Cage Code | 14099 |
| EU RoHS | Yes |
| HTS Code | 8542390001 |
| Schedule B | 8542390000 |
| Automotive | No |
| AEC Qualified | No |
| PPAP | No |
| Radiation Hardening | No |
| RoHS Versions | 2011/65/EU |
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