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SMD code 509e

Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables and published code lists.

3 parts are printed 509e

Not sure which one you have?

Answer up to 4 quick questions and these 3 parts are ranked, with a meter test that settles it. It works on a dead part too.

Load switch, all Global Mixed-mode Technology. What differs:

  • G509H20DT11GSOT-23-55 pinsSOT-23-55 pins
    What it is
    Load switch
    Maker
    Global Mixed-mode Technology
    Package
    SOT-23-5
    Pins
    5
    Details
    Power Distribution Switch
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: Load switch.

    Datasheetfor G509H20DT11G, opens in a new tab
  • G509H20DTP1GSOT-23-66 pinsSOT-23-66 pins
    What it is
    Load switch
    Maker
    Global Mixed-mode Technology
    Package
    SOT-23-6
    Pins
    6
    Details
    Power Distribution Switch
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: Load switch.

    Datasheetfor G509H20DTP1G, opens in a new tab
  • 1 more part has no package on record

Is it dead? One meter test per kind

Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.

Load switch

Voltage, board powered, black probe on ground.

Working, it reads

Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.

Dead, it reads

  • Output at the input voltage while switched off: the pass element has shorted.
  • Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
On the board:
An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
The pinout and whether the enable is active high or low differ between parts. The datasheet gives both.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

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