Not the same scale, but generally people head to two particular shopping centres: Funan DigitalLife Mall & Sim Lim Square.
View inside Sim Lim Square by hippietrail
Funan is more upmarket than Sim Lim, which caters more to the general populous.
The downside is that there are quite a few ongoing scams at some of the stores in these centres. Some of these are described in the second link. So you have to come prepared, having done your research, and know what you should be expecting when you buy something, how much it should cost and what it should do.
Credit:stackoverflow.com‘