I've been using Intersil's HI7190 24 bit analog to digital converters for years now. These chips are normally available in 20-SOIC packages and therefore are SMT devices. But, stupidly, I've just recently discovered that they're extremely sensitive to the temperature used when soldering them.
I've been soldering them by hand using a simple Weller soldering station set at 600 °F (and became rather skilled at it) and it wasn't until I had to use a different ADC that I discovered that they should be soldered below 400 °F . I've tested the low-temp technique on the HI7190, and the devices show a remarkable increase in their performance because of that. The problem is that soldering at lower temperatures is much harder with ordinary 60/40 solder and a soldering iron.
Anyway, I've got a few questions:
I've been soldering them by hand using a simple Weller soldering station set at 600 °F (and became rather skilled at it) and it wasn't until I had to use a different ADC that I discovered that they should be soldered below 400 °F . I've tested the low-temp technique on the HI7190, and the devices show a remarkable increase in their performance because of that. The problem is that soldering at lower temperatures is much harder with ordinary 60/40 solder and a soldering iron.
Anyway, I've got a few questions:
- Would the pin-by-pin technique used with a soldering iron affect the chips due to abrupt temperature differentials during the process, even if solder was done at low temperature?
- Would it be better to use an oven and low-temp paste to solder them to the PCB so as to avoid these temp differentials?
- Are there any 20-SOIC sockets, devices or techniques that would allow me to mount those chips on a PCB without having to actually solder them?
- Is there low temperature solder out there (such as bismuth alloys, or other) that's available in wire, rather than in paste form?