> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # 8-channel Bi-directional Logic Level Converter - TXB0108 **Type:** Product page · **SKU:** ADA395 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/8-channel-bi-directional-logic-level-converter-txb0108.html ([markdown](https://core-electronics.com.au/8-channel-bi-directional-logic-level-converter-txb0108.html.md)) 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... ## Pricing - **Price:** $15.85 (inc GST) — $14.41 AUD, exc GST - **Quantity discounts:** 10+ $13.97 (exc GST) · 50+ $13.69 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 2 today, and up to 500 more in 8–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA395:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA395:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description 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. Although one can use resistors to make a divider, for high speed transfers, the resistors can add a lot of slew and cause havoc that is tough to debug. For that reason, Adafruit like using 4050/74LVX245 series and similar logic to perform proper level shifting. Only problem is that they are only good in one direction which can be a problem for some specialty bi-diectional interfaces and also makes wiring a little hairy. That's where this lovely chip, the TXB0108 bi-directional level converter comes in! This chip perform bidirectional level shifting from pretty much any voltage to any voltage and will **auto-detect the direction**. Only thing that doesn't work well with this chip is i2c (because it uses strong pullups which confuse auto-direction sensor). If you need to use pullups, you can but they should be at least 50K ohm - the ones internal to AVRs/Arduino are about 100K ohm so those are OK! Its a little more luxurious than a 74LVX245 but if you just don't want to worry about directional pins this is a life saver! **Since this chip is a special bi-directional level shifter it does not have strong output pins that can drive LEDs or long cables, it's meant to sit on a breadboard between two logic chips!** If you do not need instant bi-directional support, we suggest the 74LVX245 as below which has strong output drive. This breakout saves you from having to solder the very fine pitch packages that this chip comes with. They also add 0.1uF caps onto both sides and a 10K pull-up resistor on the output enable pin so you can use it right out of the box! ## Technical Details - [TXB0108 Datasheet](https://core-electronics.com.au/attachments/localcontent/txb0108_7190279e6d5.pdf) - [TXB0108 App note detailing how it works!](https://core-electronics.com.au/attachments/localcontent/txb0108appnote_10478a51ba5.pdf) - [EagleCAD PCB files on GitHub](https://github.com/adafruit/Adafruit-TXB0108-PCB) - [Fritzing object in Adafruit Fritzing library](https://github.com/adafruit/Fritzing-Library) ![](https://core-electronics.com.au/attachments/localcontent/rohs_icon_8216055e11.jpg) ## Guides for this product - [How to Use a Logic Level Shifter/Converter](https://core-electronics.com.au/guides/digital-electronics/how-to-use-logic-level-shifters-converters/) ## Videos for this product - [Logic Level Converters for Particle](https://core-electronics.com.au/videos/logic-level-converters-for-particle) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/3/9/395-06.jpg)