New Industry Products

Diodes Incorporated Unveils Two High-Voltage Analog Multiplexers

October 19, 2020 by Gary Elinoff

The PS508 and PS509 analog multiplexers can reliably switch up to 36 volts in the tough industrial arena.

Aimed at the industrial internet of things (IIoT), new PS508 and PS509 support multi-sensor applications in factory automation, test and measurement, battery monitoring and process control.


The PS508 and PS509 Analog Multiplexers.
The PS508 and PS509 Analog Multiplexers. Modified Image courtesy of Mouser


What are Multiplexers?

Analog multiplexers are devices that are presented with two or more inputs. Its job is to choose which of those inputs is selected to be transmitted over the output line(s). As an example, a multiplexer might have eight inputs. It must choose, at any given moment, which of those eight inputs are chosen to be transmitted over one available output line. That’s how the PS508 works. 


The PS508

The PS508 offers an 8:1 ratio for single-ended switching. 


0 X* X* X* All channels are off
1 0 0 0 Channel 1 on
1 0 0 1  Channel 2 on
1 0 1 0 Channel 3 on
1 0 1 1 Channel 4 on
1 1 0 0 Channel 5 on
1 1 0 1 Channel 6 on
1 1 1 0 Channel 7 on
1 1 1 1 Channel 8 on
Truth Table for the PS508. Image courtesy of Diodes Incorporated Data Sheet


The three input lines, A2, A1 and A0, choose which one of the eight (23) lines is chosen for transmission


The PS509

The PS509 is also presented with eight separate analog signal inputs, but its job is to select a pair of channels to be transmitted, resulting in differential 4:1 channels or dual 4:1 signal-end channels. 


0 X* X* All channels are off
1 0 0 Channels 1A and 1B on
1 0 1 Channels 2A and 2B on
1 1 0 Channels 3A and 3B on
1 1 1 Channels 4A and 4B on
Truth Table for the PS509. Image courtesy of Diodes Incorporated Data Sheet


The two selection lines, A1 and A0, choose which one of the four (22) pairs of line are is chosen for transmission.


Switching and Signal Fidelity

The units feature typical transition times of 171 ns and a typical break-before-make time delay of 75 ns. The devices are turned ON or OFF via the EN pin in 126 and 125 ns, respectively.

Both units feature input leakage of 30 pA and charge injection of 0.9 pC. On capacitances for the PS508 and PS509 are 30 pF and 20pF, respectively.

On resistance is as low as 125Ω. This low ON-resistance, the low leakage current, and low charge injection all combine to:

  • Minimize signal loss and degradation
  • Reduce output signal errors
  • Improve the signal quality to facilitate backend ADC analysis. 

The low leakage current also allows the units to be used in situations involving interfacing with high impedance sources.

Channel to channel crosstalk is -88 dB (typ)  between adjacent channels. The figure is -96 dB (typ) between non-adjacent channels


Power Supply Requirements

The units can work with dual supplies ranging from ±5 volts to ±18 volts or from a single supply over a 10 to 36 volt range. Some unsymmetric power supplies, such as +12 volts and  –5 volts, are also possible. The typical supply current requirement is 135 μA.

With an appropriately chosen supply voltages, both devices can be used with either CMOS or TTL level data inputs



  • Factory Automation
  • Automotive Applications
  • Industrial Process Controls
  • ATE Test Equipment
  • Programmable Logic Controllers (PLC)
  • Battery Monitoring Systems 
  • Analog Input Modules 
  • Digital Multimeters 
  • Portable devices


Physical and Environmental Considerations

Both units operating over a temperature range of from 40° to +125°C

Available packaging (see data sheet for details)

  • 16-pin TSSOP 
  • 16-pin QSOP 
  • 16-pin SOIC 


Environmental Notes

  • Lead-Free and RoHS Compliant
  • Halogen Free
  • Antimony Free

Automotive applications requiring qualification to AEC-Q100, AEC-Q101 or AEC-Q200 can be accommodated. If needed, the units can be manufactured as per the Production Part Approval Process (PPAP). They can also be manufactured in IATF 16949 certified facilities.