#854 SPST Momentary Push-buttons with LED
Testing some push-button switches with built-in LEDs. I’ve used a CD4069 inverter-based latching circuit to demonstrate toggling the LED on and off.
Here’s a quick demo..
Notes
I found some push-button switches with built-in LEDs, and got a batch to test them out: “5PCS 10PCS PS-202 Mini 6MM 6Pin SPDT DPDT Momentary Push Button Switch 2A 250VAC 5A 120VAC Toggle Switch With Red Cap” (aliexpress seller listing), purchased 5 pieces for SG$4.48 (Jun-2026).
Details are scant; the following is the closest to a data sheet that I could find, but it didn’t include the LED details (I have annotated the picture). Note:
- The switch and LED circuits are completely independent.
- The LED cathode pin has been coloured with a marker on the devices I received.
- I was not sure if a current limiting resistor is included in the switch, but I am 99% sure there is not one included.
- The LED is turned on when power is applied across the LED pins 5 and 6 (with a suitable current-limiting resistor).
Circuit Design
Designed with Fritzing: see MomentarySPSTWithLED.fzz.
To test and demonstrate the switch, I’ve coupled it up to a latching circuit based on LEAP#761 Inverter-based Push Button Latch.
Pressing the push-button will toggle the built-in LED on and off.
Setup on a breadboard for testing:
