Part Number: SN74HC4851-Q1
We are looking for the decoder which has 3 control signals and 8 outputs.
We could not find a product that satisfys the required output current which is about 20mA.
So, I'm looking for a multiplexer that can supply current of about 20 mA.
I found several 8:1 multiplexers like SN74HC4851-Q1, but I can not judge to use when the switch current is around 20 mA.
I know that it can only be used less than 25mA, because it is written that the maximum rating of these devices is 25mA in the datasheet.
I want a material to judge how much current it can be used.
For example, it is Ron at 5mA, 10mA, 15mA and 20mA etc.
Please tell me if there are restrictions on switch current.
For our usage, Vdd and Vcom are supposed to be 5V.
If you are looking for a 8:1 device that can source or sink 20mA of current I don't think we have an option. If you want to be able to pass 20mA of current through a multiplexers that shouldn't be an issue if you meet the current limit in the abs max rating.
What do you think about the SN74CBT3251?
What are you trying to do in your system? The SN74CBTXXXX family are NFET switches and will pass a signal ~Vcc - 1 due to the Vgs voltage of the FET getting low and operating in the cut off region. You can see more information in this application note.
In reply to Adam Torma:
In reply to Tomoaki Yoshida91:
We currently do not have plans to release the SN74CBT3251 for automotive grade but that could always change based on market needs and business case.
The SN74HC4851-Q1 you already selected could support 20mA current
I also found some other 8:1 switches that are automotive qualified using the TI.com switch search tool.
The on state resistance will not change with the current through the switch. The on-state resistance will vary with supply voltage, I/O voltage, and temperature
Below are my teste conditions
Vcc = 6V
A,B,C = 0 V
COM = current sink
Y0 = 3.3 V
Ron was calculated by (Vcom - Vyo)/ current sink on COM pin
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