Memory device is serial EEPROM, which can be 25020/25080/93c56/93c86, all 8 pin SMD package.
Expected file size for 25020 and 93c56 is 256 bytes, for 25080 is 1024 bytes and for 93c86 is 2048 bytes.
Use JMA TPX1 or CN1 or K-JMD or Errebi TX1 transponder.
Written transponder is ready and programmed to start the vehicle.

Vehicles equipped with this unit:
Toyota: RAV4, Corolla, Sienna, Yaris, MR2
Lexus: IS200, IS300, GS300