IRLR2905PBF vs IRLR3110ZPBF vs IRLR3114 vs IRL3705: Best Transistor for Injection Pump Controller

Hello!!
As in topic which of the following transistors:
IRLR2905PBF IRLR3110ZPBF IRLR3114 IRL3705
will be the best option? This is to be a transistor for the injection pump controller. The first is supposedly the closest to the original. The most important is the reaction time of all of them. Do they have the same time?

http://www.datasheetcatalog.org/datasheet/irf/irlr2905.pdf

http://datasheetz.com/data/Discrete%20Semicon...ETs%20-%20Single/IRLR3110ZPBF-datasheetz.html

http://www.datasheetz.com/data/Discrete%20Sem...20-%20Single/IRLR3114ZTRPBFCT-datasheetz.html

http://www.irf.com/product-info/datasheets/data/irl3705z.pdf

to those listed
IRLR2905PBF
IRLR3110ZPBF
IRLR3114
IRL3705
you can still add
IRLR2705PBF
IRLR2905ZPB
IRLU3705ZPB
IRLZ44N
it connects them all
1 / production in the same company IR
2 / "logical" control
3 / and the purpose of "automotiv" or motoring.
4 / sa type Mos-fet channel N

these transistors and many more can help to regenerate a damaged Bosch pump driver ...

but how to assess their suitability for this application ???
maybe from the beginning - for this application they should

1 / transistors should have a so-called "logical" control level
that is, it is already attached to a level below 3V on the gate
2 / min. Current max. 42 A / - resistance of the coil of the dose controller 1,2 ohm /
3 / small DPACK housing and not 2Dpack - that's why IRL3705 and IRLZ44N do not fit inside the controller and either mill the lid or install it outside
4 / the corresponding low ON resistance in conduction - the smaller the better
5 / possibly high speed of work - here, in principle, is coupled with point 2 - maximum conduction current - because the higher it is the higher the gate's capacity and the transistor is "slower"
6 / operating voltage minimum 55V / for 12V power /

but "vox populi - vox Dei"
according to practitioners, the IRLR2905PB is the most appropriate
but there are those who devoutly believe in the miraculous power of IRLU3705 for the exceptional failure of Bosch's Bosch Focus pump - statistically more than 80% of failures concern this model, especially vintage 1998/1999

after installation
IRLR2905ZPB IRLR3114
or other with higher current and the related gate area capacity, the controller often reports errors due to too slow control of the solenoid valve
IRLR3110ZPBF has too high resistance in the ON state

but most importantly - to determine what was the cause of the failure and not to drive with the air in the fuel lines - refuel at least 2/3 of the tank and not allow to "drive on the fumes"

Hello

I now have a dilemma with the choice of a transistor, I would like to temporarily heal my VP44 injection pump in the opel and give myself a little time to prepare for the expense related to regeneration.

The most frequently mentioned are:

IRLR2905
VDSS = 55V
RDS (on) = 0.027?
ID = 42A
Pd = 110W

However, in the Opel forum I found two posts that strongly undermine this transistor

The man who inserted IRLR2905 twice and fell after 2 days

Quote:

as I wrote in my last post I gave up the next transistor replacement and I was going to sell the astra for parts. I put it on eBay. 2 days before the end of the auction, a "potential customer" wrote to me, who asked what was wrong with the pump and offered me a repair if I want. I wrote back to him that I was fixing the driver - after two days it was the same. He was surprised a bit because he thought that only he and his company in the UK knows how to do it ...
In any case, it stood out that he offered to repair the driver in exchange for information on how I learned about the transistor + opinion about his company at the English automotive electronics forum ...

I sent the driver, returned after 4 days, astra started and works until now (I've tested it for 2 weeks)

I do not know what transistor it used but wrote that it does not mount IRLR2905 because it overheats ...

Another quote also from the forum

Quote:

I have one friend from the forum and I think irlr2905 is poor and irlr3705 perfectly. This fact eliminates the first one.

The parameters of this recommended one are:

IRLR3705ZPBF
VDSS = 55V
RDS (on) = 8.0m?
ID = 42A
Pd = 130W

I came across several times

IRL3705ZS
VDSS = 55V
RDS (on) = 8.0m?
ID = 75A
Pd = 130W

The symbols are very similar to the two above (IRL3705 and IRLR3705) and are easy to confuse, but the catalog parameters of the allowable current are very different.

Some still recommend

IRFZ44N
VDSS = 55V
RDS (on) = 17.5m?
ID = 49A
Pd = 94W

IRL3803S
VDSS = 30V (probably should be enough, rather at 12 V power supply there will be no more voltages in the system)
RDS (on) = 0.006?
ID = 140A
Pd = 200W

However, nowhere can I find an unambiguous oneanswers, it seems that the most recommended IRLR2905 is probably not the best solution, I have already seen a few entries where professionals repairing these drivers confirm that it is not IRLR2905, but nobody wants to reveal the secret that should be mounted.

Looking for thermal adhesives, I began to think about one more thing, to improve the heat dissipation of the transistor, it is not better to use thermally conductive paste instead of thermal glue, which has better thermal conductivity. In order for the transistor to adhere well to the surface, it should be well pressed from the top.

Now I would like to exchange the transistor for days, but I do not know what to install, I bet on IRLR3705ZPBF.

Maybe someone has already struggled with it and has experience in the practice of inserting transistors.
Can you say your opinion on this topic?

If there is a mechanical cause, no transistor can withstand.

I put in this IRLR2905PBF for 100 km. if you have any more questions, write GG 7723234

janusz2008 wrote:

If there is a mechanical cause, no transistor will last.

I know about it, but with posts on the forum Opel well-chosen transistor held up to 30 thousand km. Let it with me at least 10 or 5 thousand km, as for me it will be about 2 months, and this will allow me to prepare financially. And the service, if the driver is damaged, will not fix it any more but only replace it with a new one.

tomekpppp wrote:

me in my insert IRLR2905PBF was enough for 100 km.

How did you assemble it, thermal glue or solder permanently to the heat sink?
As I have already quoted the opel forum, IRLR2905PBF is not suitable due to overheating because I think IRLR3705ZPBF recommended, I even thought I could use IRL3705ZS but 75A would be rather excessive, and I remember that the higher the current, the slower the transistor will be, which can negatively affect the operation of the whole pump.
If it was possible to mount it on a thermally conductive paste instead of glue, it would be better to dissipate the heat. Soldering permanently to the heat sink would be the best option, only that I do not know how to decorate it without damaging the transistor itself.

for thermo conductive paste

tomekpppp wrote:

for thermo conductive paste

I found a thermal adhesive, one that Arctic Silver Thermal (TM) Adhesive other is THERMOPOX 85 CT . Both have a similar thermal conductivity and much better than the generally available tempered pastes for PC processors. I do not know which one to use, THERMOPOX 85 CT does not have any operating temperatures.

nikimis wrote:

3 / small DPACK housing and not 2Dpack - that's why IRL3705 and IRLZ44N do not fit inside the controller and either mill the lid or install it outside

I saw drivers where IRL3705ZS was inserted in the D2PAK enclosure. You need to cut the housing a little deeper and fit it on the old heat sink. You have to get a little more naked with wires, but somebody does not put them in a way that makes it harder for them to work.

DPAK
IRLR3705Z http://www.irf.com/product-info/datasheets/data/irlr3705z.pdf
VDSS = 55V
RDS (on) = 8.0m?
ID = 42A
Pd = 130W
Qg = 44nC

D2PAK
IRL3705ZS http://www.irf.com/product-info/datasheets/data/irl3705z.pdf
VDSS = 55V
RDS (on) = 8.0m?
ID = 75A
Pd = 130W
Qg = 40nC

The last parameter seems to play an important role here.

I always solder the transistor and gently mill the case. Every car starts, one drives a long time for the other on the same transistor. No pastes, adhesives and other clamps, full temperature control of the heat sink and two soldering irons and skill = success. An old theme but it keeps coming back.