What base emitter resistors are inside Darlington

[cupoftea]

Hi,
Do you know what BE resistors are in this Darlington?......this must be known so that the minimum load can be applied.

https://www.farnell.com/datasheets/1912254.pdf

The below Darlington shows the BE resistors...

https://www.farnell.com/datasheets/2309902.pdf

 

[betwixt]

First transistor shunt is typically 10K, the second is typically 150 Ohms. Figures from ST who also manufacture the same devices.

Brian.

 

[cupoftea]

Thanks, that means , i believe that a minimum load of 0.7V/150R is needed?

 

[betwixt]

Depends on what you mean by 'minimum load', what configuration are you using it in?

Brian.

 

[cupoftea]

Thanks, To drop from 60v to 5v as linear regulator........with it in "common collector"(?)
...As in R/Zener/BJT regulator.

 

[betwixt]

Sounds more like an emitter follower configuration.

You are right about there being a minimum load because of leakage through the shunt resistors but it would be quite small, no more than about 5.5mA but if you are concerned about your load being inadequate I would think using the transistor at all would be overkill too. A simple resistor/Zener would be cheaper and dissipate the same total power.

Brian.