# Sink/Source Current ADA757

**URL:** <https://forums.pimoroni.com/t/sink-source-current-ada757/22705>\
**Category:** Support\
**Created:** [August 13, 2023, 6:38am UTC](https://forums.pimoroni.com/t/sink-source-current-ada757/22705 "2023-08-13T06:38:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![marl\_scot](https://avatars.discourse-cdn.com/v4/letter/m/dec6dc/32.png) [@marl\_scot](https://forums.pimoroni.com/u/marl_scot)\
**Post date:** [August 13, 2023, 6:38am UTC](https://forums.pimoroni.com/t/sink-source-current-ada757/22705/1 "2023-08-13T06:38:49Z")

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Hi,  
Does anyone know what the max source/sink current is per channel on this device :

> **[Adafruit 4-channel I2C-safe Bi-directional Logic Level Converter](https://shop.pimoroni.com/products/adafruit-4-channel-i2c-safe-bi-directional-logic-level-converter?variant=302017581)**
>
> Because the Arduino (and Basic Stamp) are 5V devices, and most modern sensors, displays, flash cards and modes are 3.3V-only, many makers find that they need to perform level shifting/conversion to protect the 3.3V device from 5V.

I am looking at controlling some 5v equipment that can draw up to 70mA on some channels :(  
But I still need the bi-directionality for some lines.  
Thanks  
Marl

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<div class="post-metadata">

**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\
**Post date:** [August 13, 2023, 8:54am UTC](https://forums.pimoroni.com/t/sink-source-current-ada757/22705/2 "2023-08-13T08:54:07Z")

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You might have to do some math. ;)  
[BSS138 N-Channel Logic Level Enhancement Mode Field Effect Transistor (adafruit.com)](https://cdn-shop.adafruit.com/datasheets/BSS138.pdf)