SN28648P

Joaquin de Prada

Other Parts Discussed in Thread: DRV8876

I was wondering if there’s a modern replacement that I can use for SN28648P, used as motor driver in Polaroid SX-70 in the 1970s?

Thank you

over 5 years ago

0 Ryan Kehr over 5 years ago

TI__Guru 55655 points

Joaquin,

Yes, there certainly is. :)

To help better direct you, can you give me some more information on your system needs? Voltage range? Current requirements? Any information on your motor would also be helpful.

0 Ryan Kehr over 5 years ago in reply to Ryan Kehr

TI__Guru 55655 points

Joaquin,

Just following up on this to see how else I can help.

0 Joaquin de Prada over 5 years ago in reply to Ryan Kehr

Prodigy 20 points

Ryan,

First of all, thank you for your support.

The SX-70 used a DC motor at 6V and 12000rpm. It peaks north of 2.3A, to be safe 3A at 6V.

The whole picture taking sequence takes less 1.5sec.

The original TI chip marked SN28648P was described in 1974:

“ integrated control circuit, an NPN motor drive transistor, and a PNP dynamic braking transistor”

I am thinking of a small SMD solution that can be mounted on a small PCB (it’s a DIL8, actually 7) to make it pin compatible.

Thank you

0 Ryan Kehr over 5 years ago in reply to Joaquin de Prada

TI__Guru 55655 points

Joaquin,

Please check out the DRV8876. It is in a small, 3x3mm, QFN package and you could put it on a daughter board and solder it into your existing PCB.

Motor drivers

Motor drivers forum

SN28648P