P-Channel MOSFETs

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According to the final Layout Design, I will need 21 transistors—one for each row. Each of these transistors must be capable of passing a maximum of as calculated in Current Amplifier, and support a as per Maximum LED Forward Voltage.

I will use a parametric search on DigiKey for single FETs and FET arrays.

Ideally, I want to try and avoid SOT23 packages, as I suspect they will be a tad frustrating to layout & route—as one transistor is needed for each shift register pin. This makes a device like the SSM6J422TU look attractive, but, even this device spans across three pins' worth (with the same pitch as my SN74HCS594PWR shift registers)—such that the of length difference versus a SOT23 may be negligible.

I could then go for an array like the SIL2301-TP, which packs two MOSFETs into (roughly) the same physical footprint. The pinout also looks quite convenient—I can short the two sources together to , and the gate input pins are all on opposite sides to the drain output pins.

This SIL2301-TP device also has less gate charge & input capacitance of & versus the slightly lower , more expensive PJS6801, which has gate charge & input capacitance. The SIL2301-TP actually has a lower typical , but higher maximum of .

The SSM6P816R is a Toshiba dual PMOS device with an exceptionally low typical at , but has a high gate charge & input capacitance, and has an inconvenient pinout.

The FDC6318P is a pin-compatible part with the SIL2031-TP, but has slightly worse specifications across the board, and is more expensive.

In terms of single-device parts, the most attractive are:

1. DMP2165UW-7 with , , , and ;
2. SSM3J327R with , , , and ; and
3. NXV75UPR with , , , and .