> **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

# Surface Mount Rotary Encoder - EC11J

**Type:** Product page · **SKU:** ADA5454 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/surface-mount-rotary-encoder-ec11j.html ([markdown](https://core-electronics.com.au/surface-mount-rotary-encoder-ec11j.html.md))

For projects that need a rotary encoder but need to keep it single-sided or need to avoid interrupting traces or devices on the other side, here's an...

## Pricing

- **Price:** $8.15 (inc GST) — $7.41 AUD, exc GST
- **Quantity discounts:** 10+ $7.19 (exc GST) · 50+ $7.04 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 18 and Sep 22.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA5454:1` (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/ADA5454:1.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

For projects that need a rotary encoder but need to keep it single-sided or need to avoid interrupting traces or devices on the other side, here's an all-SMT rotary encoder! It's a high-quality 15-pulse encoder from Alps, with detents and a nice feel. There's a nice smooth bushing for placement in a box.

Knob not included, [but you can pick one up here](https://core-electronics.com.au/slim-rubber-rotary-encoder-knob-11-5mm-x-14-5mm-d-shaft.html).

This encoder also has a push-button built into it so you can press onto the knob to close a separate switch. One side has a 3 pad connector (ground and two coding pins) and the other side has two pad for a normally open switch. There's also 6 large mechanical pads for making a strong physical connection: best to use a ground plane with 6 open pads so that there's a solid sheet to protect against the encoding shearing off.

Rotary encoders are useful as rotation sensors or selectors and look similar to potentiometers. However they are not like potentiometers at all, so it's important to realize the difference! These rotary encoders rotate all the way around continuously and are divided up into 15 'segments'. Each segment has a clicky feeling to it, and each movement clockwise or counter-clockwise causes the two switches to open and close. There is no way to know what the current 'position' is - instead you would use a microcontroller to count how many 'clicks' left or right it has been turned. If you need to detect rotational 'position' a potentiometer would be a better choice.

##  Technical Details 

**Specifications:**

- 15mm long flat shaft
- 30 positions 15 pulses
- Press-switch travel: 1.5mm
- Operating life: 100,000 cycles
- Operating temperature range: -40°C to +85°C
- 10mA 5V DC
- Output signal: A, B, 2-phase output
- Maximum/minimum operating current (resistive load): 10mA/1mA
- Insulation resistance: 100MO min. 250V DC
- Withstand voltage: 300V AC for 1 minute or 360V AC for 1s
- Detent torque:
    - 12±5mN·m (initial stage)
    - 10±4mN·m (after reflow)
- Shaft push and pull strength: 100N
- Journey: 0.5±0.3mm
- Action force: 5±2N

- [Datasheet](https://core-electronics.com.au/attachments/localcontent/5454_1837001_9387230f6bd.pdf)

 ![RoHS 2 2011 65 EU Compliant](https://core-electronics.com.au/attachments/localcontent/RoHS2_2011_65_EU_7356c5574c.svg)![RoHS 2 2015 863 EU Compliant](https://core-electronics.com.au/attachments/localcontent/RoHS2_2015_863_EU_86773f57f9.svg)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/A/D/ADA5454-1.jpg)