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| Part Number | AS3955A-ATWT-S4 | AS3955A-ATWT-I4 | AS3955-ASWF-I4 | AS3955-ASWF-S4 | AS3955-AWLT-I4 |
| Manufacturer | ams-OSRAM USA INC. | ams-OSRAM USA INC. | ams-OSRAM USA INC. | ams-OSRAM USA INC. | ams-OSRAM USA INC. |
| Series | - | - | - | - | - |
| Package/Case | 12-UFBGA, WLCSP | - | 12-UFBGA, WLCSP | 12-UFBGA, WLCSP | 12-UFBGA, WLCSP |
| Packaging | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) |
| Product Status | Obsolete | Obsolete | Active | Obsolete | Obsolete |
| Type | RFID Transponder | RFID Transponder | RFID Transponder | RFID Transponder | RFID Transponder |
| Frequency | 13.58MHz | 13.56MHz | 13.58MHz | 13.58MHz | 13.58MHz |
| Standards | ISO 14443, NFC | ISO 14443 | ISO 14443, NFC | ISO 14443, NFC | ISO 14443, NFC |
| Interface | SPI | I2C, SPI | I2C | SPI | I2C |
| Voltage - Supply | 1.65V ~ 5.5V | 1.65V ~ 5.5V | 1.65V ~ 5.5V | 1.65V ~ 5.5V | 1.65V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Grade | - | - | - | - | - |
| Qualification | - | - | - | - | - |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Supplier Device Package | 12-WLCSP (2.13x1.42) | - | 12-WLCSP (2.13x1.42) | 12-WLCSP (2.13x1.42) | 12-WLCSP (2.13x1.42) |
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