In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

William,

the only chance to program the SMD SX before soldering is using a matching adapter. These are available at distributors but pretty expensive. If you have someone on hand who can handle precision mechanic, it might be an idea to construct your own retainer for the chip with contact needles touching the Vdd, Vss, OSC1, OSC2, and MCLR pins.

Programmed chips will not lose information as long as the soldering temperature does not exceed the typical limits.

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